Updated on 2024/04/04

写真a

 
Hiroaki Furumai
 
Organization
Research and Development Initiative Institute Professor
Contact information
The inquiry by e-mail is 《here
External link

Degree

  • 工学博士 ( 東京大学 )

Education

  • 1984.3
     

    The University of Tokyo   doctor course   completed

Research History

  • 2022.4 - Now

    Chuo University   Research and Development Initiative   Full time researcher   Institute Professor

  • 1998.6 - 2022.3

    The University of Tokyo   The Graduate School of Engineering   Professor

  • 1997.2 - 1998.6

    The University of Tokyo   The Graduate School of Engineering   Associate Professor

  • 1991.10 - 1997.2

    Ibaraki University   Faculty of Engineering   Associate Professor

  • 1988.7 - 1991.9

    Kyushu University   School of Engineering   Associate Professor

  • 1986.4 - 1988.6

    Kyushu University   School of Engineering   Research Associate

  • 1984.4 - 1986.3

    Tohoku University   Faculty of Engineering   Research Associate

▼display all

Professional Memberships

  • 霞ヶ浦研究会

  • 応用生態工学研究会

  • 水文・水資源学会

  • 米国水環境連盟(Water Environment Federation)

  • 環境科学会

  • 日本水道協会

  • 日本水環境学会

  • 日本下水道協会

  • 国際水協会(International Water Association)

  • 土木学会

  • Ecology and Civil Engineering Society

  • Japan Society of Hydrology and Water Resources

  • Water Environmental Federation

  • Society of Environmental Science, Japan

  • Japan Water Works Association

  • Japan Society on Water Environment

  • Japan Sewage Works Association

  • International Water Association

  • Japan Society of Civl Engineers

▼display all

Research Interests

  • 下水道

  • 用・廃水処理

  • 都市雨水管理

  • 水環境保全

  • Water and Wastewater Treatment

  • Urban Drainage Management

  • Water Environment Management

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Environmental systems for civil engineering

  • Environmental Science/Agriculture Science / Environmental dynamic analysis

  • Environmental Science/Agriculture Science / Environmental load reduction and remediation

Papers

  • Occurrence and diversity of nontuberculous mycobacteria affected by water stagnation in building plumbing

    Iftita Rahmatika, Dai Simazaki, Futoshi Kurisu, Hiroaki Furumai, Ikuro Kasuga

    Water Supply   23 ( 12 )   5017 - 5028   2023.12

     More details

    Publishing type:Research paper (scientific journal)  

    Nontuberculous mycobacteria (NTM) refer to mycobacteria other than Mycobacterium tuberculosis and Mycobacterium leprae. Some NTM are known to cause pulmonary and skin diseases. As NTM are prevalent in water supply systems, the health burden of waterborne NTM is concerned. However, little is known about NTM in building plumbing. This study revealed the abundance and diversity of NTM in building plumbing by using culture-dependent and culture-independent approaches. Moreover, the chlorine susceptibility of NTM isolates in tap water was evaluated. The increase in the abundance of Mycobacterium spp. was observed in some taps after 24 h of stagnation, indicating that NTM could have the potential to regrow in building plumbing. While Mycobacterium mucogenicum and Mycobacterium avium were detected by cultivation, amplicon sequencing of NTM-specific hsp65 genes revealed that Mycobacterium gordonae was dominant in most of the samples, which was not detected by cultivation. The chlorine susceptibility experiment demonstrated that NTM strains related to M. avium and M. mucogenicum were 119 and 426 times more tolerant to chlorine than Escherichia coli, respectively. As M. mucogenicum, M. avium, and M. gordonae are regarded as opportunistic pathogens, intensive monitoring of NTM in tap water in building plumbing is necessary.

    DOI: 10.2166/ws.2023.318

    Scopus

    researchmap

  • Monsoon dilutes the concurrence but increases the correlation of viruses and Pharmaceuticals and Personal Care Products (PPCPs) in the urban waters of Guwahati, India: The context of pandemic viruses

    Manish Kumar, Keisuke Kuroda, Damia Barcelo, Hiroaki Furumai

    Science of The Total Environment   813   152282 - 152282   2022.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.scitotenv.2021.152282

    researchmap

  • High-throughput Screening of Antimicrobial Resistance Genes and their Associations with Class 1 Integrons in Urban Rivers in Japan Reviewed

    Ikuro Kasuga, Kyoka Nagasawa, Masato Suzuki, Futoshi Kurisu, Hiroaki Furumai

    Frontiers in Environmental Science   2022.2

     More details

    Antimicrobial resistance (AMR) is a serious public health concern. Many countries have implemented AMR surveillance programs for humans and animals, but a scheme for monitoring AMR in the environment has not yet been established. Class 1 integrons, which can acquire antimicrobial resistance genes (ARGs) to gene cassettes, were proposed as a candidate to evaluate the anthropogenic impacts on AMR. However, the association between class 1 integrons and ARGs in aquatic environments is less studied and requires further elucidation. This study used high-throughput quantitative polymerase chain reaction (HT-qPCR) to characterize the pollution profiles of ARGs and mobile gene elements (MGEs) in 24 urban rivers in Tokyo and its surrounding area. The abundance of class 1 integron-integrase gene (intI1) and the array of class 1 integron gene cassettes were also determined. In total, 9–53 target genes were detected per sample, and their abundances increased following effluent discharge from wastewater treatment plants. The river and wastewater samples were categorized based on their HT-qPCR profiles, indicating that this method was useful for characterizing the pollution status in aquatic environments. The prevalence of intI1 in the rivers was observed. Some ARGs and MGEs were positively correlated with intI1, indicating that intI1 could be used as a proxy for monitoring these ARGs and MGEs in urban rivers. Long-read sequencing of class 1 integron gene cassettes revealed that 1–3 ARGs were present in the gene cassettes. Regardless of the sample type, blaGES-24, aadA2, and qacH were dominant in the gene cassettes. The source and spread of class 1 integrons carrying these ARGs in aquatic environments should be further monitored.

    DOI: 10.3389/fenvs.2022.825372

    researchmap

  • A novel approach for determining integrated water discharge from the ground surface to trunk sewer networks for fast prediction of urban floods Reviewed

    Lianhui Wu, Yoshimitsu Tajima, Hiroshi Sanuki, Yoshihiro Shibuo, Hiroaki Furumai

    Journal of Flood Risk Management   15 ( 1 )   2021.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    Many urban flood models employ coarse grids to reduce the computational cost of real-time forecasting. Such a coarse grid, however, may result in poor predictions of the discharge rate of surface water because of difficulties in representing the detailed features of drainage facilities. In the present study, an urban flood model that consists of a one-dimensional (1D) river flow model, a two-dimensional (2D) ground surface flow model, and a 1D sewer network model was developed. A coarse grid is used for the 2D ground surface flow model, and the tail networks of the sewer systems are neglected to reduce computational cost. A novel approach is proposed for determining the integrated water discharge from the ground surface to the trunk sewer network to retain the accuracy of a simplified coarse-grid system. Numerical experiments were performed to evaluate the performance of the proposed method. Measured water levels at manholes were employed to examine the accuracy of the model. The results show that this approach significantly improves the accuracy of the simulated water level in a sewer network with enhanced computational efficiency.

    DOI: 10.1111/jfr3.12773

    Scopus

    researchmap

    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1111/jfr3.12773

  • Non-target screening of dissolved organic matter in raw water, coagulated water, and chlorinated water by Orbitrap mass spectrometry

    Warangkana Na Phatthalung, Oramas Suttinun, Phanwatt Phungsai, Ikuro Kasuga, Futoshi Kurisu, Hiroaki Furumai, Charongpun Musikavong

    Chemosphere   264   2021.2

     More details

    Publishing type:Research paper (scientific journal)  

    © 2020 Elsevier Ltd This study aimed to classify the possible molecular formulas of precursors for disinfection by-products (DBPs) in raw, coagulated, and chlorinated water samples from the U-Tapao Canal, Songkhla, Thailand. The molecular formulas of DBPs in chlorinated water were investigated. Polyaluminum chloride (PACl) was employed as a coagulant. Orbitrap Fourier transform-mass spectrometry was able to estimate the composition of dissolved organic matter (DOM) with the carbon (C), hydrogen (H), oxygen (O), nitrogen (N), and sulfur (S) elements contained and DBPs at the molecular level. The molecular formulas of the DOM in the raw water primarily consisted of CHO and CHON when extracted by lichrolut EN. The CHO and CHON species were rich in lignin-, tannin-, and condensed aromatic-like substances. The DOM with high-molecular-weight from 300 to 500 Da were preferentially removed by coagulation. The PACl coagulation decreased the abundances of lignin-, tannin-, and condensed aromatic-like substances in the CHO formulas, while lignin- and condensed aromatic-like substances in the CHON formulas remained. The remaining precursors corresponded to CHON molecules in the coagulated water, which may result in the formation of some chlorine (Cl)-containing molecules. Several DBPs among the CHOCl and CHONCl species were produced in the chlorinated water through the addition reaction of chlorine. New chlorinated N-DBPs of 21 formulas were detected.

    DOI: 10.1016/j.chemosphere.2020.128437

    Scopus

    PubMed

    researchmap

  • Application of Capsid Integrity (RT-)qPCR to Assessing Occurrence of Intact Viruses in Surface Water and Tap Water in Japan

    Vu Duc Canh, Shotaro Torii, Hiroaki Furumai, Hiroyuki Katayama

    Water Research   189   116674 - 116674   2021.2

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.watres.2020.116674

    researchmap

  • Changes in dissolved organic matter during water treatment by sequential solid-phase extraction and unknown screening analysis

    Phanwatt Phungsai, Futoshi Kurisu, Ikuro Kasuga, Hiroaki Furumai

    Chemosphere   263   2021.1

     More details

    Publishing type:Research paper (scientific journal)  

    © 2020 Elsevier Ltd Isolation of complex dissolved organic matter (DOM) from environmental water is a major challenge for unknown screening analysis by high-resolution mass spectrometry. In this study, DOM in process water during advanced drinking water treatment was fractionated sequentially by three solid-phase extraction (SPE) cartridges based on the polarity and charge of DOM molecules. By sequential SPE with unknown screening analysis, over 3000 DOM features were found in raw water, whereas around 2000 were obtained by a single SPE. The hydrophobic neutral (HPON) fraction contained CHO features with highest averaged molecular weight followed by hydrophobic acid (HPOA) and then hydrophilic acid (HPIA). The average degree of carbon double bond equivalents and carbon oxidation states indicated that the HPON fraction contained molecules that were more unsaturated and less oxidized than those of the HPOA and HPIA fractions. Ozone selectively decomposed (1) more unsaturated and less oxidized HPON features, (2) more unsaturated HPOA compounds, and (3) less oxidized HPIA molecules. Oxidation by-products were mostly HPON and HPIA compounds that were more oxidized than the decomposed molecules. During biological activated carbon (BAC) filtration, less oxidized HPON were preferentially removed, whereas HPOA were removed without selectivity. HPON and HPIA molecules with more oxidized character were found to be refractory to BAC treatment. HPON with more unsaturated and HPIA with more oxidized characters were decomposed by chlorine. Many types of HPIA decomposed during chlorination were the oxidation by-products of ozonation that were refractory to BAC treatment. Sequential SPE with unknown screening analysis provided previously unknown details of the molecular characteristics of DOM and its changes during advanced water treatment.

    DOI: 10.1016/j.chemosphere.2020.128278

    Scopus

    researchmap

  • Microplastics in urban wastewater and estuarine water: Importance of street runoff

    Masaya SUGIURA, Hideshige TAKADA, Naohiko TAKADA, Kaoruko MIZUKAWA, Shumpei TSUYUKI, Hiroaki FURUMAI

    Environmental Monitoring and Contaminants Research   1   54 - 65   2021

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Japan Society for Environmental Chemistry  

    DOI: 10.5985/emcr.20200006

    researchmap

  • Prediction of Urban Non-point Pollution Load by Statistical Analysis of Data of Published Research and Its Reliability Evaluation –Statistical Analysis of Mean Load and Verification and Modification of Previously Proposed Model Using Newly Obtained Data–

    OZAKI Noriatsu, WADA Keiko, MURAKAMI Michio, NAKAJIMA Fumiyuki, FURUMAI Hiroaki

    Journal of Japan Society on Water Environment   44 ( 1 )   1 - 8   2021

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    To verify a statistical model for predicting urban pollutant runoff developed in our previous research, newly obtained runoff data were compared with those predicted by the model. The proposed model previously was a regression model using parameters representing geological, rainfall, and hydrological characteristics. The targeted pollutants were COD, SS, TN, and TP, and their event mean concentrations (EMCs) for each rainfall were predicted. From the comparison, the model was found to predict the EMC to one order of magnitude. Moreover, the yearly mean EMC was evaluated from only the mean and standard deviation of all data for each index. The error ratio of the prediction of the mean of 50 rainfall events was within 50%. Furthermore, in order to consider the possible differences among different catchment areas, the EMC values for three catchment areas newly obtained were compared statistically with nationwide values obtained previously. Significant differences were found for one area out of the three which thus emphasizes the importance of the consideration of catchment area differences. Thereafter, the number of runoff samples in a specific watershed area required to detect the mean EMC difference from the nationwide database was derived statistically. This number was calculated to be 10 at most for detecting more than double or less than half of the database means. Lastly, a modified model that includes watershed area differences using a generalized linear mixed model was proposed.

    DOI: 10.2965/jswe.44.1

    CiNii Books

    CiNii Research

    researchmap

    Other Link: http://id.ndl.go.jp/bib/031867545

  • Temperature-Dependent Ammonium Removal Capacity of Biological Activated Carbon Used in a Full-Scale Drinking Water Treatment Plant. International journal

    Chotiwat Jantarakasem, Ikuro Kasuga, Futoshi Kurisu, Hiroaki Furumai

    Environmental science & technology   2020.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Nitrification is a key function of biological activated carbon (BAC) filters for drinking water treatment. It is empirically known that the nitrification activity of BAC filters depends on water temperature, potentially resulting in the leakage of ammonium from BAC filters when the water temperature decreases. However, the ammonium removal capacity of BAC filters and factors governing the capacity remain unknown. This study employed a bench-scale column assay to determine the volumetric ammonium removal rate (VARR) of BAC collected from a full-scale drinking water treatment plant. VARR was determined at a fixed loading rate under different conditions. Seasonal variations of the VARR as well as impacts of the water matrix and water temperature on ammonium removal were quantitatively analyzed. While the VARR in an inorganic medium at 25 °C was maintained even during low water temperature periods and during breakpoint chlorination periods, the water matrix factor reduced the VARR in ozonated water at 25 °C by 33% on average. The VARR in ozonated water was dependent on water temperature, indicating that the microbial activity of BAC did not adapt to low water temperature. The Arrhenius equation was applied to reveal the relationship between VARR and water temperature. The actual ammonium removal performance of a full-scale BAC filter was predicted. VARR is useful for water engineers to reexamine the loading and filter depth of BAC filters.

    DOI: 10.1021/acs.est.0c02502

    PubMed

    researchmap

  • Molecular-level characterization of biodegradable organic matter causing microbial regrowth in drinking water by non-target screening using Orbitrap mass spectrometry

    Ikuro Kasuga, Miyu Suzuki, Futoshi Kurisu, Hiroaki Furumai

    Water Research   184   2020.10

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.watres.2020.116130

    Scopus

    PubMed

    researchmap

  • Applicability of polyethylene glycol precipitation followed by acid guanidinium thiocyanate-phenol-chloroform extraction for the detection of SARS-CoV-2 RNA from municipal wastewater

    Shotaro Torii, Hiroaki Furumai, Hiroyuki Katayama

    Science of The Total Environment   143067 - 143067   2020.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.scitotenv.2020.143067

    researchmap

  • A Chronicle of SARS-CoV-2: Seasonality, Environmental Fate, Transport, Inactivation, and Antiviral Drug Resistance Reviewed

    Manish Kumar, Payal Mazumder, Sanjeeb Mohapatra, Alok Kumar Thakur, Kiran Dhangar, Kaling Taki, Santanu Mukherjee, Arbind Kumar Patel, Prosun Bhattacharya, Pranab Mohapatra, Jörg Rinklebe, Masaaki Kitajima, Faisal I Hai, Anwar Khursheed, Hiroaki Furumai, Christian Sonne, Keisuke Kuroda

    Journal of Hazardous Materials   124043 - 124043   2020.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.jhazmat.2020.124043

    researchmap

  • Metal partitioning and leaching vulnerability in soil, soakaway sediments, and road dust in the urban area of Japan. International journal

    Manish Kumar, Hiroaki Furumai, Ikuro Kasuga, Futoshi Kurisu

    Chemosphere   252   126605 - 126605   2020.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Isotope dilution techniques (IDT) and sequential extraction procedures (SEPs) were compared to apprehend the differences between two techniques in determining metal exchangeability and vulnerability to pollute the urban groundwater. For this purpose, soil (n = 2), "soakaway" sediment deposited in the artificial infiltration facilities (AIF) (n = 4), and road dust (n = 2) were sampled from Tokyo metropolitan. Sorption coefficients of four metals (Cu, Zn, Cd and Pb) were assessed through isotopic exchangeability (E-value) and potential mobile pool i.e. addition of exchangeable, reducible and oxidizable fraction obtained by Community Bureau of Reference (BCR)-procedures. The E-value for the three samples were found smaller than the potential mobile pool but were higher than BCR-exchangeable fractions. The use of strong extractants are likely to play an active role in the disagreement between SEPs and IDT. IDT accounts for the isotopic exchangeability while BCR provides information of vulnerability of metals associated with different fractions that can leach under different environmental conditions. Sorption coefficients measured in soakaway sediment was found comparable to soil thus likely to retain metals. However, as variability in environmental conditions is likely to affect Kd, the soakaway sediment may become an active metal source in future rather than acting as the permanent sink. The study concludes that there is the possibility of errors while predicting metal vulnerability to groundwater with both techniques and thus a model compliance integrating the virtue of both techniques will be a way forward.

    DOI: 10.1016/j.chemosphere.2020.126605

    PubMed

    researchmap

  • Metal partitioning and leaching vulnerability in soil, soakaway sediments, and road dust in the urban area of Japan

    Manish Kumar, Hiroaki Furumai, Ikuro Kasuga, Futoshi Kurisu

    Chemosphere   252   2020.8

     More details

    Publishing type:Research paper (scientific journal)  

    © 2020 Elsevier Ltd Isotope dilution techniques (IDT) and sequential extraction procedures (SEPs) were compared to apprehend the differences between two techniques in determining metal exchangeability and vulnerability to pollute the urban groundwater. For this purpose, soil (n = 2), “soakaway” sediment deposited in the artificial infiltration facilities (AIF) (n = 4), and road dust (n = 2) were sampled from Tokyo metropolitan. Sorption coefficients of four metals (Cu, Zn, Cd and Pb) were assessed through isotopic exchangeability (E-value) and potential mobile pool i.e. addition of exchangeable, reducible and oxidizable fraction obtained by Community Bureau of Reference (BCR)-procedures. The E-value for the three samples were found smaller than the potential mobile pool but were higher than BCR-exchangeable fractions. The use of strong extractants are likely to play an active role in the disagreement between SEPs and IDT. IDT accounts for the isotopic exchangeability while BCR provides information of vulnerability of metals associated with different fractions that can leach under different environmental conditions. Sorption coefficients measured in soakaway sediment was found comparable to soil thus likely to retain metals. However, as variability in environmental conditions is likely to affect Kd, the soakaway sediment may become an active metal source in future rather than acting as the permanent sink. The study concludes that there is the possibility of errors while predicting metal vulnerability to groundwater with both techniques and thus a model compliance integrating the virtue of both techniques will be a way forward.

    DOI: 10.1016/j.chemosphere.2020.126605

    Scopus

    PubMed

    researchmap

  • Spatial and temporal profiles of enteric viruses in the coastal waters of Tokyo Bay during and after a series of rainfall events. Reviewed International journal

    Kentaro Inoue, Tatsuya Asami, Tomoyo Shibata, Hiroaki Furumai, Hiroyuki Katayama

    The Science of the total environment   727   138502 - 138502   2020.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Recreational activities in coastal waters that are polluted by enteric viruses can result in gastroenteritis etc. In this study, the pollution profiles of enteric viruses were examined in the coastal area of Tokyo Bay, Japan, by collecting 57 water samples from three different depths (0.5 m, 3.0 m, and 5.0 m) during and after a series of heavy rainfall events. Vertically spatial and temporal changes in the concentrations of NoV genogroup I (GI) and genogroup II (GII), pepper mild mottle virus (PMMoV), and Aichi virus (AiV) were determined using quantitative reverse transcription-polymerase chain reaction, while those of the bacterial indicator, Escherichia coli, and F-specific RNA bacteriophages (FRNA phages) were monitored using culture methods. PMMoV was highly abundant (1.4 × 104-6.8 × 106 genome copies/L), whereas the concentrations of the other enteric viruses were relatively low (AiV, 1.3 × 102-2.9 × 104; GI, 2.9 × 10-5.6 × 103; GII, 2.5 × 10-1.2 × 104 genome copies/L). All of the viruses showed lower fluctuations in concentration than E. coli, which increased up to 460-fold after the rainfall event and then decreased over the subsequent two weeks. The maximum vertical difference in E. coli concentration was observed immediately after the rainfall. The E. coli reached the surface and then gradually spread down, whereas the virus concentrations exhibited few fluctuations due to the remaining effects of the previous combined sewer overflows. These findings indicate that viruses have a relatively long retention period over fecal indicator bacteria in this coastal area.

    DOI: 10.1016/j.scitotenv.2020.138502

    PubMed

    researchmap

  • Competition for growth substrates in river water between Escherichia coli and indigenous bacteria illustrated by high resolution mass spectrometry. International journal

    Yoshihiro Ishii, Futoshi Kurisu, Ikuro Kasuga, Hiroaki Furumai

    Letters in applied microbiology   2020.7

     More details

    Language:English  

    Escherichia coli normally cannot grow in the environment. One environmental stress that prevents E. coli growth may be the competition for growth substrates with co-existing microorganisms. In this study, the growth substrates of E. coli were screened by high resolution mass spectrometry and compared with those of indigenous bacteria in river water. In an incubation experiment, E. coli multiplied in sterilized river water, but did not multiply when indigenous microorganisms were present in the water. By analysing dissolved organic matter in the river water before and after E. coli growth, 35 compounds were identified as putative growth substrates of E. coli. Among them, 33 compounds were also identified as putative growth substrates of indigenous bacteria. These results indicate that E. coli and indigenous bacteria compete for organic substrates in river water, which could suppress the growth of E. coli.

    DOI: 10.1111/lam.13343

    PubMed

    researchmap

  • Molecular-level characterization of biodegradable organic matter causing microbial regrowth in drinking water by non-target screening using Orbitrap mass spectrometry. International journal

    Ikuro Kasuga, Miyu Suzuki, Futoshi Kurisu, Hiroaki Furumai

    Water research   184   116130 - 116130   2020.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.watres.2020.116130

    PubMed

    researchmap

  • Application of Orbitrap mass spectrometry to investigate seasonal variations of dissolved organic matter composition in a eutrophic lake in Japan

    Vitharuch Yuthawong, Ikuro Kasuga, Futoshi Kurisu, Hiroaki Furumai

    Environmental Science: Water Research and Technology   6 ( 7 )   1816 - 1827   2020.7

     More details

    Publishing type:Research paper (scientific journal)  

    © The Royal Society of Chemistry. Rapid urbanization induces organic pollution in closed water bodies and accelerates eutrophication. Dissolved organic matter (DOM), a major fraction of organic matter, causes various problems in water use. DOM sources in lakes are diverse. Moreover, DOM properties can be altered biologically and physicochemically during retention time. However, DOM in lakes consists of complex unknown substances. In the present study, high-resolution Orbitrap mass spectrometry (Orbitrap MS) was employed to determine the molecular-level composition of low-molecular-weight DOM in Lake Inba, the most polluted eutrophic lake in Japan. One-year monitoring demonstrated that the lake's DOM consisted of core components that were detected year-around and season-specific components. Although most DOM components extracted by solid phase extraction in the lake came from inflow rivers, lake-specific components were present, which could be associated with algal growth in the lake. Permanganate pretreatment was integrated with Orbitrap MS to screen for components contributing to dissolved chemical oxygen demand (DCODMn), an environmental parameter used in Japan to define the water quality of lakes and reservoirs. Results indicated that only minor and highly unsaturated components were responsible for DCODMn. With this approach, we were able to shed light on how the DOM composition in a eutrophic lake was shaped at molecular level, which cannot be achieved by conventional analysis.

    DOI: 10.1039/d0ew00129e

    Scopus

    researchmap

  • Molecular-level comparison of dissolved organic matter in 11 major lakes in Japan by Orbitrap mass spectrometry

    Ikuro Kasuga, Vitharuch Yuthawong, Futoshi Kurisu, Hiroaki Furumai

    Water Science and Technology: Water Supply   20 ( 4 )   1271 - 1280   2020.6

     More details

    Publishing type:Research paper (scientific journal)  

    © 2020 IWA Publishing. All rights reserved. Dissolved organic matter (DOM) causes organic pollution in lakes, resulting in the occurrence of off-flavour etc. when lake water is used as a drinking water source. In this study, DOM in 11 major lakes in Japan was characterised by high-resolution Orbitrap mass spectrometry. Molecular formulas were assigned to 845-1,451 components per sample. Among them, 555 components were commonly found in all lakes. The DOM compositions of the 11 lakes were clustered into four groups. Correlation analysis could extract specific components whose relative intensities were associated with water quality indices such as specific ultraviolet absorbance, specific dissolved chemical oxygen demand (DCODMn), and specific trihalomethane formation potential (R = 0.80-0.93, p<0.05). Although further molecular structural analyses of DOM components are necessary, these results could be informative for exploring key candidates related to specific water quality issues. Pretreatment of samples with permanganate oxidation was applied to screen components which could contribute to DCODMn. DCODMncomponents accounted for only 7-30% of total peak intensities, indicating the limited performance of permanganate oxidation. Pre-treatment by permanganate coupled with Orbitrap MS revealed that components with higher molecular weight, higher oxygen-tocarbon ratios (O/C), and lower hydrogen-to-carbon ratios (H/C) could be responsible for DCODMn.

    DOI: 10.2166/ws.2020.042

    Scopus

    researchmap

  • Sequential treatment using a hydrophobic resin and gel filtration to improve viral gene quantification from highly complex environmental concentrates. International journal

    Akihiko Hata, Hiroaki Furumai, Hiroyuki Katayama

    Water research   174   115652 - 115652   2020.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Assays based on the polymerase chain reaction (PCR) are widely applied to quantify enteric viruses in aquatic environments to study their fates and potential infection risks. However, inhibitory substances enriched by virus concentration processes can result in inaccurate quantification. This study aimed to find a method for improving virus quantification by mitigating the effects of inhibitory environmental concentrates, using previous knowledge of the properties of the inhibitory substances. Performances of anion exchange resins, gel filtration, and a hydrophobic resin (DAX-8) were comparatively evaluated using poliovirus and its extracted RNA spiked into humic acid solutions. These solutions served as good representatives of the inhibitory environmental concentrates. A sequential treatment using DAX-8 resin and gel filtration produced the most favorable results, i.e., low virus losses that were stable and a reduced inhibitory effect. Furthermore, the sequential treatment was applied to another set of 15 environmental concentrates. Without the sequential treatment, serious underestimation (>4.0 log10 to 1.1 log10) of a molecular process control (murine norovirus) was measured for eight samples. With the treatment, the control was detected with <1.0 log10 underestimation for all samples. The treatment improved the quantification of seven types of indigenous viruses. In summary, the sequential treatment is effective in improving the viral quantification in various of environmental concentrates.

    DOI: 10.1016/j.watres.2020.115652

    PubMed

    researchmap

  • Impacts of organic matter migrating from pipe materials on microbial regrowth in drinking water

    Iftita Rahmatika, Ikuro Kasuga, Futoshi Kurisu, Hiroaki Furumai

    Journal of Water and Environment Technology   18 ( 1 )   45 - 53   2020

     More details

    Publishing type:Research paper (scientific journal)  

    © 2020 Japan Society on Water Environment. Polymeric materials are widely used in premise plumbing. To assess the potential of pipe materials to promote microbial regrowth in drinking water, we incubated drinking water in a new cross-linked polyethylene pipe (N-PEX), a new steel pipe lined with powdered polyethylene (N-SPE), and an old steel pipe lined with powdered polyethylene (O-SPE). As a reference, we also incubated drinking water in a carbon-free glass bottle (REF). Free chlorine rapidly depleted to below the quantification limit in the pipe incubations. While the original drinking water contained 0.4 mg C/L of dissolved organic carbon (DOC), the DOC concentration in N-PEX, N-SPE and O-SPE increased to 5.2, 3.1 and 1.7 mg C/L, respectively, after 8 days of incubation. The total cell count (TCC) in N-PEX, N-SPE, and O-SPE increased from <103 cells/mL to 6.0 × 105, 2.8 × 105, and 3.6 × 106 cells/mL after 8 days of incubation, respectively. On the other hand, the TCC in REF increased to 1.4 × 105 cells/mL after 14 days of incubation. Dominant bacterial groups were different under the different incubation conditions. These results indicated that organic matter migrating from pipe materials promote microbial regrowth and affect the microbial community composition in drinking water.

    DOI: 10.2965/jwet.19-078

    Scopus

    researchmap

  • Ozone disinfection kinetics of poliovirus 1 determined by cell culture assay, RT-qPCR and ethidium monoazide qPCR reduction in a continuous quench-flow reactor

    J. Sangsanont, F. Kurisu, H. Furumai, H. Katayama

    Journal of Applied Microbiology   2020

     More details

    Publishing type:Research paper (scientific journal)  

    © 2020 The Society for Applied Microbiology Aims: A continuous quench-flow (CQF) reactor was developed to collect samples at the reaction times of less than one second. The reactor is applied to determine ozone disinfection kinetics of poliovirus and to study whether EMA-qPCR can assess the viral infectivity after ozone disinfection. Methods: Ozone disinfection of poliovirus was conducted in the developed CQF, and the disinfection kinetics were tested in the range of 0·7–5·0 s at ozone concentration of 0·08 and 0·25 mg l−1. Inactivation, damage on viral genome and damage on capsid integrity were determined by plaque assay, quantitative reverse transcription polymerase chain reaction (RT-qPCR) and ethidium monoazide treatment coupled with RT-qPCR (EMA-qPCR), respectively. Results: By using CQF, 2·18 and 2·76 log10 reductions were observed at the reaction time of 0·7 s and ozone concentration of 0·08 and 0·25 mg l−1, respectively, followed by tailing. Ozone disinfection kinetics of poliovirus 1 were better fit by the efficiency factor Hom model than by the Chick-Watson model, or the modified Chick-Watson model. Kinetics observed were similar between RT-qPCR and EMA-qPCR assays at the reaction times of <2·0 s and ozone concentrations of 0·08 and 0·25 mg l−1. At reaction times > 5 s, viral concentration evaluated by EMA-qPCR was reduced in comparison to stable RT-qPCR results. Both assays still underestimated the virus inactivation. Conclusion: The simple developed reactor can be used to investigate viral ozone disinfection kinetics and to elucidate inactivation characteristics or mechanisms at very short exposure times. Significance and Impact of the Study: The developed CQF reactor is beneficial for better understanding of virus inactivation by ozone, and the reactor can be used to better elucidate disinfection kinetics and mechanisms for future research. This work constitutes an important contribution to the existing knowledge of the application and limitation of the EMA/PMA-qPCR to assess virus infectivity after ozone disinfection.

    DOI: 10.1111/jam.14787

    Scopus

    PubMed

    researchmap

  • Repeated pressurization as a potential cause of deterioration in virus removal by aged reverse osmosis membrane used in households. International journal

    Shotaro Torii, Takashi Hashimoto, An Thuan Do, Hiroaki Furumai, Hiroyuki Katayama

    The Science of the total environment   695   133814 - 133814   2019.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    Reverse osmosis (RO) membrane is widely used for household water treatment in areas with limited access to safe drinking water; however, some studies documented deterioration in the quality of RO permeate. Repeated pressurization from intermittent operation in households is suspected to have an adverse effect on RO. This study aimed to evaluate virus removal by RO used in actual households as well as the water quality of permeate, and to elucidate the main cause of RO deterioration. We conducted a survey in households in Hanoi, Vietnam, to collect 27 membranes along with their usage history, where virus removal was investigated in laboratory. Of the used RO membranes, 22% did not show the protective level, >3 log10 (99.9%) virus removal, recommended by World Health Organization. The differences in virus removal among Aichi virus, MS2 and φX-174 were <0.5 log10. All membranes with estimated pressurization times of <4000 showed >3 log10 virus removal, while 17% of membranes used for <3years, the manufacturers' warranty period, did not achieve the criterion. Therefore, virus removal performance may not be assured even if the users replace the membrane following the warranty period. Furthermore, more pressurized membranes exhibited significantly lower virus removal than less pressurized ones, suggesting a major role of repeated pressurization in the deterioration of RO. Coliforms were detected from 44% of the permeate of the point-of-use devices applying RO (RO-POU), raising concerns on the extrinsic contamination and regrowth of bacteria. Consequently, RO in households may deteriorate more rapidly than the manufactures' expectation due to repeated pressurization. RO in households should be replaced based on not only membrane age but also total pressurized times (i.e., 4000 times) to keep the protective level of virus removal. The deteriorated bacterial quality in RO permeate suggested the need for installing post-treatment, such as UV irradiation.

    DOI: 10.1016/j.scitotenv.2019.133814

    PubMed

    researchmap

  • Repeated pressurization as a potential cause of deterioration in virus removal by aged reverse osmosis membrane used in households

    Shotaro Torii, Takashi Hashimoto, An Thuan Do, Hiroaki Furumai, Hiroyuki Katayama

    SCIENCE OF THE TOTAL ENVIRONMENT   695   2019.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER  

    Reverse osmosis (RO) membrane is widely used for household water treatment in areas with limited access to safe drinking water; however, some studies documented deterioration in the quality of RO permeate. Repeated pressurization from intermittent operation in households is suspected to have an adverse effect on RO. This study aimed to evaluate virus removal by RO used in actual households as well as the water quality of permeate, and to elucidate the main cause of RO deterioration. We conducted a survey in households in Hanoi, Vietnam, to collect 27 membranes along with their usage history, where virus removal was investigated in laboratory. Of the used RO membranes, 22% did not show the protective level, >3 log(10) (99.9%) virus removal, recommended by World Health Organization. The differences in virus removal among Aichi virus, MS2 and phi X-174 were <0.5 log(10). All membranes with estimated pressurization times of <4000 showed >3 logic virus removal, while 17% of membranes used for <3 years, the manufacturers' warranty period, did not achieve the criterion. Therefore, virus removal performance may not be assured even if the users replace the membrane following the warranty period. Furthermore, more pressurized membranes exhibited significantly lower virus removal than less pressurized ones, suggesting a major role of repeated pressurization in the deterioration of RO. Coliforms were detected from 44% of the permeate of the point-of-use devices applying RO (RO-POD), raising concerns on the extrinsic contamination and regrowth of bacteria. Consequently, RO in households may deteriorate more rapidly than the manufactures' expectation due to repeated pressurization. RO in households should be replaced based on not only membrane age but also total pressurized times (i.e., 4000 times) to keep the protective level of virus removal. The deteriorated bacterial quality in RO permeate suggested the need for installing post-treatment, such as UV irradiation. (C) 2019 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.scitotenv.2019.133814

    Web of Science

    researchmap

  • Concurrence of antibiotic resistant bacteria (ARB), viruses, pharmaceuticals and personal care products (PPCPs) in ambient waters of Guwahati, India: Urban vulnerability and resilience perspective

    Manish Kumar, Bhagwana Ram, Ryo Honda, Chomphunut Poopipattana, Vu Duc Canh, Tushara Chaminda, Hiroaki Furumai

    Science of the Total Environment   693   2019.11

     More details

    Publishing type:Research paper (scientific journal)  

    © 2019 Elsevier B.V. Multi-drug resistant microbes, pathogenic viruses, metals, and pharmaceuticals and personal care products (PPCPs) in water has become the crux of urban sustainability issues. However, vulnerability due to pollutant concurrences, source apportionment, and identification of better faecal indicators needs to be better understood. The present study focuses on the vulnerability of urban Guwahati, the largest city in Northeastern India, through analyzing the concurrence of PPCPs, enteric viruses, antibiotic resistant bacteria, metal, and faecal contamination in water. The study strives to identify a relevant marker of anthropogenic pollution for the Indian scenario. Samples from the Brahmaputra River (n = 4), tributary Bharalu River (an unlined urban drain; n = 3), and Ramsar recognized Lake (Dipor Bil; n = 1) indicate caffeine > acetaminophen > theophylline > carbamazepine > crotamiton for PPCPs and pepper mild mottle virus (PMMoV) > aichi > hepatitis A > norovirus GII > norovirus GI for enteric viruses. PMMoV was the better indicator of faecal pollution due to its prevalence, specificity and ease of detection. Antibiotic resistance was neither correlated with the prevalence of PPCPs nor E. coli. As, Co and Mn appear to be inducing antibiotic resistance in E. coli. While the risk quotient of the urban drain (Bharalu River) indicates one order higher magnitude than reported for other Indian rivers, the Lake exhibited the least pollution and better resilience. The concurrence of pollutants and multi-drug resistant E. coli, owing to the complete absence of wastewater treatment, puts the city in a highly vulnerable state. Pollution is being regulated only by the dilution capability of the Brahmaputra River, which needs to be further researched for seasonal variation.

    DOI: 10.1016/j.scitotenv.2019.133640

    Scopus

    PubMed

    researchmap

  • Removal of pepper mild mottle virus by full-scale microfiltration and slow sand filtration plants Reviewed

    Vu Duc Canh, Hiroaki Furumai, Hiroyuki Katayama

    NPJ CLEAN WATER   2   2019.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:NATURE PUBLISHING GROUP  

    It is important to evaluate the removal of enteric viruses by drinking water treatment processes so that viral infection risk can be assessed and managed. However, evaluating the removal of enteric viruses by full-scale treatment processes can be challenging due to the low numbers of viruses and the presence of substances in the water samples that inhibit detection. In this study, we evaluated the removal of pepper mild mottle virus (PMMoV) by microfiltration (MF) and slow sand filtration (SSF) at two full-scale drinking water treatment plants in Japan, quantifying virus concentrations with real-time polymerase chain reaction (qPCR). The removal of PMMoV by MF ranged from 0.0 to >0.9 log(10), although concentrations were below the detection limit for half of the treated water samples. SSF removed PMMoV by up to 2.8 log(10); however, the removal efficiency decreased to 0.0-1.0 log(10 )under cold water temperatures. Process control showed that nucleic acid extraction and qPCR efficiency were inhibited in nearly 40% of water samples. Dilution, DAX-8, and ferrihydrite treatments for purification were effective in mitigating these inhibitory effects.

    DOI: 10.1038/s41545-019-0042-1

    Web of Science

    researchmap

  • Development of Real-Time Assimilation Model for Prediction of Inundation on Urbanized Coastal Lowland Reviewed

    L. Wu, Y. Tajima, D. Yamazaki, Y. Shibuo, H. Sanuki, H. Furumai

    International Conference on Asian and Pacific Coasts 2019   1343 - 1349   2019.9

     More details

    Publishing type:Part of collection (book)   Publisher:Springer Singapore  

    DOI: 10.1007/978-981-15-0291-0_182

    researchmap

  • Molecular characteristics of dissolved organic matter transformed by O-3 and O-3/H2O2 treatments and the effects on formation of unknown disinfection by-products Reviewed

    Phungsai Phanwatt, Kurisu Futoshi, Kasuga Ikuro, Furumai Hiroaki

    WATER RESEARCH   159   214 - 222   2019.8

  • Impact of repeated pressurization on virus removal by reverse osmosis membranes for household water treatment

    Shotaro Torii, Takashi Hashimoto, An Thuan Do, Hiroaki Furumai, Hiroyuki Katayama

    ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY   5 ( 5 )   910 - 919   2019.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Reverse osmosis (RO) membranes are commoditized and available for household water treatment (HWT) in areas where access to safe water is limited. The RO membranes for HWT (residential RO) are typically operated intermittently without a cleaning process. This suggests that a unique mechanism of membrane deterioration, membrane oxidation, one of the main causes of RO membrane deterioration in industrial settings (desalination and wastewater reclamation), is not involved. Furthermore, the intermittent operation provides repeated shear stress on the membrane surface. This study aimed to evaluate the impact of repeated pressurization on virus (bacteriophage MS2 and phi X-174) removal by residential RO and to determine the location of integrity loss. We repeatedly pressurized and de-pressurized spiral-wound residential RO membranes for up to 10 000 cycles, while periodically evaluating virus removal. E. coli removal was also determined after 10 000 cycles. Moreover, these membranes were examined for virus and E. coli removal in a flat-sheet configuration. For the first 3000-4000 cycles, phi X-174 removal was maintained at approximately 4 log(10) (99.99%), and then dramatically decreased. After 10 000 cycles, even E. coli leaked from the membrane. The deterioration of virus removal in a flat-sheet configuration indicates integrity loss at the membrane surface. Therefore, repeated pressurization deteriorated the virus removal performance of residential RO. The number of times that the RO membrane can be pressurized should be included as a criterion to determine the frequency of membrane replacement in residential RO.

    DOI: 10.1039/c8ew00944a

    Web of Science

    researchmap

  • Potential of biological arsenite oxidation in sand filtration units at arsenic-iron removal plants (AIRPs) in Bangladesh Reviewed

    Uddin Mohammad Mosleh, Kurisu Futoshi, Kasuga Ikuro, Furumai Hiroaki, Islam S. M. Atiqul

    APPLIED WATER SCIENCE   9 ( 3 )   2019.4

  • Viability RT-qPCR Combined with Sodium Deoxycholate Pre-treatment for Selective Quantification of Infectious Viruses in Drinking Water Samples Reviewed

    Vu Duc Canh, Kasuga Ikuro, Furumai Hiroaki, Katayama Hiroyuki

    FOOD AND ENVIRONMENTAL VIROLOGY   11 ( 1 )   40 - 51   2019.3

  • Growth competition between ammonia-oxidizing archaea and bacteria for ammonium and urea in a biological activated carbon filter used for drinking water treatment Reviewed

    Niu Jia, Kasuga Ikuro, Kurisu Futoshi, Furumai Hiroaki

    ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY   5 ( 2 )   231 - 238   2019.2

  • Ferrihydrite treatment to mitigate inhibition of RT-qPCR virus detection from large-volume environmental water samples Reviewed

    Vu Duc Canh, Osawa Hideki, Inoue Kentaro, Kasuga Ikuro, Takizawa Satoshi, Furumai Hiroaki, Katayama Hiroyuki

    JOURNAL OF VIROLOGICAL METHODS   263   60 - 67   2019.1

  • Molecular-level changes in dissolved organic matter compositions in Lake Inba Water during KMnO <inf>4</inf> Oxidation: Assessment by Orbitrap mass spectrometry

    Vitharuch Yuthawong, Ikuro Kasuga, Futoshi Kurisu, Hiroaki Furumai

    Journal of Water and Environment Technology   17 ( 1 )   27 - 39   2019

     More details

    Publishing type:Research paper (scientific journal)  

    © 2019 Japan Society on Water Environment. In 2016, only 56.7% of the lakes and reservoirs in Japan complied with the standard of chemical oxygen demand determined by permanganate (COD Mn ). The dissolved organic matter (DOM) contributing to COD Mn in lakes is heterogenous in nature; hence, DOM compositions in different lake waters are not well known. In this study, molecular components contributing to dissolved COD Mn (DCOD Mn ) in lake water were identified via high-resolution Orbitrap mass spectrometry (Orbitrap MS). Water samples were collected from Lake Inba in September 2016. The filtered samples were oxidized by KMnO 4 according to the JIS method K0102 for different durations (ranging between 0-120 min). The DOM extracted via solid phase extraction was analyzed using Orbitrap MS, and molecular formulas were assigned. In all, 1,115 components were observed before oxidation. During time-course oxidation, components with higher unsaturation were selectively oxidized, suggesting that they contributed to the DCOD Mn in lake water. DCOD Mn components were screened for DOM in Lake Inba, and other DOM references were isolated from the Suwannee River and Lake Biwa. Only 14%-32% of the total components were regarded as DCOD Mn components, indicating the limited coverage of COD Mn . The compositions of DCOD Mn components were highly diverse, depending on the sources.

    DOI: 10.2965/jwet.18-043

    Scopus

    researchmap

  • Effects of Backwashing on Granular Activated Carbon with Ammonium Removal Potential in a Full-Scale Drinking Water Purification Plant Reviewed

    Niu Jia, Kasuga Ikuro, Kurisu Futoshi, Furumai Hiroaki

    WATER   10 ( 12 )   2018.12

  • Pepper mild mottle virus as a process indicator at drinking water treatment plants employing coagulation-sedimentation, rapid sand filtration, ozonation, and biological activated carbon treatments in Japan Reviewed

    Kato Ryuichi, Asami Tatsuya, Utagawa Etsuko, Furumai Hiroaki, Katayama Hiroyuki

    WATER RESEARCH   132   61 - 70   2018.4

  • Changes in Dissolved Organic Matter Composition and Disinfection Byproduct Precursors in Advanced Drinking Water Treatment Processes Reviewed

    Phungsai Phanwatt, Kurisu Futoshi, Kasuga Ikuro, Furumai Hiroaki

    ENVIRONMENTAL SCIENCE & TECHNOLOGY   52 ( 6 )   3392 - 3401   2018.3

  • Impact of various humic acids on EMA-RT-qPCR to selectively detect intact viruses in drinking water Reviewed

    Vu Duc Canh, Ikuro Kasuga, Hiroaki Furumai, Hiroyuki Katayama

    Journal of Water and Environment Technology   16 ( 2 )   83 - 93   2018

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan Society on Water Environment  

    To assess the potential risk of viral infection through drinking water, a rapid and effective method to quantify pathogenic viruses is necessary. Ethidium monoazide (EMA) combined with reverse transcription qPCR (EMA-RT-qPCR) is a currently widely accepted method to assess the integrity of viruses. However, this technique can be hampered by humic acids which are co-concentrated during virus concentration processes (VCPs). Co-concentration of four commercially available humic acids (Ald, Wa, Na, and IH) during VCPs and their impacts on the subsequent EMA-RT-qPCR over spiked intact Aichi virus 1 and its naked RNA were studied. The recoveries of Ald, Wa, Na, and IH during VCPs were less than 8.9%, 5.4%, 7.2%, and 0.7%, respectively, indicating that IH was much less concentrated than other humic acids. In the concentrates, Ald, Wa, and Na caused severe inhibition of EMA-RT-qPCR, whereas only a slight inhibitory effect on IH was observed. Tests of the influence of actual drinking water concentrates on EMA-RT-qPCR indicated the absence of severe inhibition. Therefore, EMA-RT-qPCR has a high potential for monitoring enteric viruses in drinking water.

    DOI: 10.2965/jwet.17-044

    Scopus

    researchmap

  • Spatial distribution and temporal change of PPCPs and microbial fecal indicators as sewage markers after rainfall events in the coastal area of Tokyo Reviewed

    Chomphunut Poopipattana, Misaki Nakajima, Ikuro Kasuga, Futoshi Kurisu, Hiroyuki Katayama, Hiroaki Furumai

    Journal of Water and Environment Technology   16 ( 3 )   149 - 160   2018

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan Society on Water Environment  

    Water sampling was conducted in the coastal area of Tokyo following two rainfall events in October and November 2016. The coastal area receives, through urban rivers, a considerable amount of combined sewer overflow (CSO) pollutants from overflow chambers and pumping stations. Five pharmaceutical and personal care products (PPCPs) including acetaminophen, theophylline, crotamiton, carbamazepine, and caffeine were analyzed and used as chemical sewage markers. In addition, two types of bacteriophage were counted as markers for viral contamination as well as the fecal bacterial indicators Escherichia coli and total coliform. High contamination by PPCPs and microbial fecal indicators was observed after the rainfall events. Five key markers were selected among nine target markers using correlation analysis and were used to express the spatial distribution and temporal change in CSO pollutants. Escherichia coli showed relatively fast die-off behavior and decreased sharply from one day after the rainfall events, while bacteriophages persisted for several days after the events. Somatic coliphage showed more persistent behavior than F-specific bacteriophage. Labile markers such as caffeine also showed high rates of disappearance. In addition, monitoring results suggested that combined analyses of PPCPs and microbial fecal indicators can provide a more informed discussion on the distribution and diffusion of sewage contaminants in coastal waters following rainfall events.

    DOI: 10.2965/jwet.17-052

    Scopus

    researchmap

  • Characterization of Natural Organic Substances Potentially Hindering RT-PCR-Based Virus Detection in Large Volumes of Environmental Water Reviewed

    Akihiko Hata, Manami Inaba, Hiroyuki Katayama, Hiroaki Furumai

    ENVIRONMENTAL SCIENCE & TECHNOLOGY   51 ( 23 )   13568 - 13579   2017.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Quantitative detection of pathogenic viruses in the environmental water is essential for the assessment of water safety. It is known that some of natural organic substances interfere with virus detection processes, i.e., nucleic acid extraction and reverse transcription-PCR. Such substances are carried over into a sample after virus concentration. In this study, inhibitory substances in coastal water samples were characterized in view of their effects on efficiency of virus detection and property as organic matters. Among 81 samples tested, 77 (95%) showed low recoveries (&lt;10%) of spiked murine norovirus. These recovery rates were correlated with the levels of organic matter present in virus concentrates as measured by ultraviolet absorbance at 254 nm (r = -0.70 - -0.71, p &lt; 0.01). High-performance gel chromatography and fluorescence excitation-emission matrix spectroscopy revealed that organic fractions in the 10-100 kDa size range, which were not dominant in the original samples, and those possessing humic acid-like fluorescence properties were dominant in virus concentrates. The inhibitory effect was more pronounced during summer. Substances originating from seawater seemed to cause a more pronounced effect than those originating from wastewater. Our data highlight the previously unknown characteristics of natural inhibitory substances and are helpful in establishing an effective sample purification technique.

    DOI: 10.1021/acs.est.7b00306

    Web of Science

    researchmap

  • 擬似温暖化台風出力による鶴見川流域の外水・内水氾濫解析と治水効果に関する研究 Reviewed

    渋尾 欣弘, 谷口 健司, 佐貫 宏, 吉村 耕平, 李 星愛, 田島 芳満, 小池 俊雄, 古米 弘明, 佐藤 愼司

    土木学会論文集B1(水工学)   73 ( 4 )   I_1381 - I_1386   2017.3

     More details

    Language:Japanese  

    DOI: 10.2208/jscejhe.73.I_1381

    researchmap

  • Analysis of Urban Inandation by Using XRAIN, High Resolution Precipitation Nowcasting, and Short-term Precipitation Forecasting

    Yoshihiro Shibuo, Sanuki Hiroshi, Yoshimura Kohei, Lee Sungae, Tajima Yoshimitsu, Furumai Hiroaki, Sato Shinji

    Proceeding of Annual Conference   30   106 - 106   2017

     More details

    Language:Japanese   Publisher:THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

    In recent years, local heavy rainfall and associated flood disasters are becoming serious issue. It is reported that in the Tokyo metropolitan area, more than 70 percent of flood damage was attributed to the local heavy rainfall. While the progress of urban drainage network construction is still in progress and the budget for public work is under decline, application of numerical model for inundation prediction is becoming important. In this study, we analyze urban inundation by applying seamlessly integrated river-, urban-, and coastal hydraulics model in the Tsurumi river basin where integrated flood management has been taken place, with giving XRAIN, High Resolution Precipitation Nowcasting, and Short-term Precipitation Forecasting as forcings. The results showed improved advantage compared to MSM-GPV and effective combination of rainfall data shall contribute to realize the inundation prediction on a real-time basis.

    DOI: 10.11520/jshwr.30.0_106

    researchmap

  • Comparison of low molecular weight dissolved organic matter compositions in Lake Inba and Kashima river by orbitrap mass spectrometry Reviewed

    Vitharuch Yuthawong, Ikuro Kasuga, Futoshi Kurisu, Hiroaki Furumai

    Journal of Water and Environment Technology   15 ( 1 )   12 - 21   2017

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan Society on Water Environment  

    Lake Inba, which serves as a drinking water source in Chiba Prefecture, Japan, has not complied with the environmental standard for COD (3 mg/L) since the 1970s. The high level of dissolved organic matter (DOM) caused by eutrophication in the lake has risen the concern of water treatment. To understand the compositions and sources of DOM in Lake Inba, this study compared molecular compositions of low molecular weight DOM (LMW-DOM, &lt
    1 kDa) in the lake and a major river flowing to the lake. Water samples were collected from Lake Inba and Kashima River in June 2015. After solidphase extraction, LMW-DOM was analyzed by Orbitrap mass spectrometry coupled with electrospray ionization. Based on the accurate mass data, 1,263 and 1,393 molecular formulae were assigned for the lake and river samples, respectively. Among them, 1,193 formulae were shared between the lake and the river, indicating that Kashima River was the representative source of LMW-DOM in the lake at the sampling occasion. Elemental composition of molecular formula demonstrated that 61% of the shared formulae were composed of carbon, hydrogen and oxygen. Hydrogen to carbon ratio and oxygen to carbon ratio of these common molecules were similar to the fingerprints of lignin and tannin.

    DOI: 10.2965/jwet.16-054

    Scopus

    researchmap

  • Estimation of source contribution to nitrate loading in road runoff using stable isotope analysis Reviewed

    K. Kojima, S. Sano, F. Kurisu, H. Furumai

    URBAN WATER JOURNAL   14 ( 4 )   337 - 342   2017

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:TAYLOR & FRANCIS LTD  

    The nitrogen load was determined in road runoff during rainfall events. Moreover, nitrate isotopes analysis was conducted to determine the contribution of nitrates from atmospheric deposition and leaching from road dust. The concentrations of NO3-N in road runoff were higher than those in atmospheric deposits for each rainfall event, except one event with a long antecedent dry weather period. The O-18-NO3 in road runoff was lower than in atmospheric deposits and higher than in leachate from road dust; however, no difference in N-15-NO3 was observed. By using O-18-NO3 as an indicator for evaluating NO3-N sources in road runoff, contribution ratios of NO3-N from road dust were estimated to be 14-22%, 23-25%, and 22-34% for Event 1 to Event 3, respectively. These results indicated that the NO3-N from the atmosphere accounts for more than half of the NO3-N in road runoff.

    DOI: 10.1080/1573062X.2016.1148176

    Web of Science

    researchmap

  • INUNDATION FORCAST SIMULATION IN URBANIZED COASTAL LOW-LYING AREAS BASED ON HIGH-RESOLUTION PRECIPITATION NOWCAST DATA Reviewed

    SANUK, H, SHIBUO, Y, LEE, S, YOSHIMURA, K, TAJIMA, Y, FURUMAI, H, S. SATO

    Journal of JSCE, B2, Coastal Engineering   73 ( 2 )   I_499 - I_504   2017

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.2208/kaigan.73.I_499

    researchmap

  • Microbial community structure of methanogenic benzene-degrading cultures enriched from five different sediments (vol 62, pg 266, 2016) Reviewed

    Noguchi Mana, Kurisu Futoshi, Sekiguchi Yuji, Kasuga Ikuro, Furumai Hiroaki

    JOURNAL OF GENERAL AND APPLIED MICROBIOLOGY   63 ( 6 )   377   2017

  • 公表調査データの統計解析による市街地ノンポイント汚濁負荷流出量の予測とその信頼性評価 Reviewed

    尾崎則篤, 和田桂子, 村上道夫, 中島典之, 古米弘明

    水環境学会誌   40 ( 3 )   115 - 124   2017

     More details

    Language:Japanese  

    雨天時における市街地流出を調査している報告書, 論文等の文献を収集し (1968〜2011年) , 一降雨を単位とした市街地の汚濁負荷 (BOD, COD, SS, TN, TP) の負荷流出データベース (DB) をまとめ, 一降雨の流量加重平均濃度 (EMC) の分布を明らかにした。続いて降雨条件, 地理的状況がEMCに及ぼす影響を回帰式で予測し, 日本全国の4地点での降雨条件を与えた際の年間流出負荷の予測値とその変動係数を導出した。その予測に基づき, 信頼性のある流出負荷量を算出するためにどの程度の降雨の採水頻度が必要になるのかをシミュレーションにより検討した。95% 信頼区間を2倍以内程度の誤差とする場合, 水質項目によっては年間の全降雨イベントのうち半分程度を採水する必要があることを明らかにした。

    DOI: 10.2965/jswe.40.115

    researchmap

  • 将来の水利用シナリオの検討を目的としたプラーヌンクスツェレにおける参加者の選好変容の評価 Reviewed

    大塚佳臣, 中谷隼, 牧誠也, 荒巻俊也, 古米弘明

    土木学会論文集G(環境工学研究論文集)   72 ( 7 )   361 - 372   2016.11

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.2208/jscejer.72.III_361

    researchmap

  • Characterisation of biodegradable organic matter in reclaimed water using a bacterial growth fingerprint assay Reviewed

    Thayanukul Parinda, Kurisu Futoshi, Kasuga Ikuro, Kanaya Kizuku, Furumai Hiroaki

    WATER SCIENCE AND TECHNOLOGY-WATER SUPPLY   16 ( 5 )   1255 - 1265   2016.10

  • Evaluation of virus removal efficiency of coagulation-sedimentation and rapid sand filtration processes in a drinking water treatment plant in Bangkok, Thailand Reviewed

    Asami Tatsuya, Katayama Hiroyuki, Torrey Jason Robert, Visvanathan Chettiyappan, Furumai Hiroaki

    WATER RESEARCH   101   84 - 94   2016.9

  • Molecular characterization of low molecular weight dissolved organic matter in water reclamation processes using Orbitrap mass spectrometry Reviewed

    Phungsai Phanwatt, Kurisu Futoshi, Kasuga Ikuro, Furumai Hiroaki

    WATER RESEARCH   100   526 - 536   2016.9

  • Identification of bacteria assimilating formaldehyde in a biological activated carbon filter by means of DNA stable isotope probing and next-generation sequencing Reviewed

    I. Kasuga, F. Kurisu, H. Furumai

    WATER SCIENCE AND TECHNOLOGY-WATER SUPPLY   16 ( 4 )   915 - 921   2016.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IWA PUBLISHING  

    Ozonation followed by a biological activated carbon (BAC) filter is a common process of advanced water purification. Ozone can generate formaldehyde (FA) as a harmful by-product, while the subsequent BAC filter is efficient at removing FA. FA adsorption is limited on activated carbon because of its hydrophilic property and low molecular weight. Thus, biological degradation by biofilms associated with the BAC is regarded as the primary treatment mechanism for FA. However, little is known about the microorganisms involved in the removal of FA. To identify specific microorganisms assimilating FA in a BAC filter, this study applied DNA stable isotope probing (DNA-SIP) combined with next-generation sequencing (NGS) technology. DNA-SIP with NGS clearly revealed that facultative methylotrophs affiliated within the specific taxonomic groups, such as Hyphomicrobium and Methylibium, were suspected to be the key players in FA removal.

    DOI: 10.2166/ws.2016.039

    Web of Science

    researchmap

  • Abundance and diversity of ammonia-oxidizing archaea and bacteria on granular activated carbon and their fates during drinking water purification process Reviewed

    Niu Jia, Kasuga Ikuro, Kurisu Futoshi, Furumai Hiroaki, Shigeeda Takaaki, Takahashi Kazuhiko

    APPLIED MICROBIOLOGY AND BIOTECHNOLOGY   100 ( 2 )   729 - 742   2016.1

  • Microbial community structure of methanogenic benzene-degrading cultures enriched from five different sediments Reviewed

    Noguchi Mana, Kurisu Futoshi, Sekiguchi Yuji, Kasuga Ikuro, Furumai Hiroaki

    JOURNAL OF GENERAL AND APPLIED MICROBIOLOGY   62 ( 5 )   266 - 271   2016

  • Chlorine Dose Determines Bacterial Community Structure of Subsequent Regrowth in Reclaimed Water

    Acharya Shwetha M, Kurisu Futoshi, Kasuga Ikuro, Furumai Hiroaki

    Journal of Water and Environment Technology   14 ( 1 )   15 - 24   2016

     More details

    Language:English   Publisher:Japan Society on Water Environment  

    Bacterial regrowth in reclaimed water, specifically observed when residual chlorine concentration declines along the distribution system, causes undesirable changes in water quality and hampers its acceptability. To study the impact of chlorination on regrowth and bacterial community structure, unchlorinated tertiary treated reclaimed water was collected and dosed with chlorine such that the initial doses were 1, 3, 5 mg-Cl2/L before being stored at ambient temperature under dark condition. Chlorine measurement, cell counts and bacterial community profiling were carried out at regular intervals for 21 days. Addition of chlorine caused rapid decline in intact cell concentration and no regrowth was observed until free chlorine decayed below detection limit (0.03 mg-Cl2/L). Upon regrowth, intact cell concentrations reached the initial level except in the case of 5 mg-Cl2/L where the intact cell concentration was lower by 1-log10. The dominant species that regrew under each condition were distinct, based on their capacity to withstand chlorine. The most chlorine-tolerant groups belonged to the order Sphingomonadales and Rhizobiales, which have been previously reported to initiate biofilms. This study demonstrates that chlorination selects specific bacterial groups which have the potential to regrow in the distribution network.

    DOI: 10.2965/jwet.15-063

    researchmap

  • INUNDATION FORCAST SIMULATION IN URBANIZED COASTAL LOW-LYING AREAS CONSIDERING MULTIPLE FLOOD CAUSING FACTORS

    SANUKI Hiroshi, SHIBUO Yoshihiro, LEE SungAe, YOSHIMURA Kouhei, TAJIMA Yoshimitsu, FURUMAI Hiroaki, SATO Shinji

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   72 ( 2 )   I_517 - I_522   2016

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    &nbsp;Urbanized coastal low-lying area has vulnerability against flood and inundation, which are caused by multiple flood causing factors occurring in coast, river and urbanized areas. Several cases of inundation were examined, in which designed water levels for warning were exceeded. Submodels were seamlessly integrated to simulate inundation caused by tsunami, storm surge, as well as river flood and urban inundation. In the same time, the model evaluated the performance of structural countermeasures such as sewage network, or retardation basin, when considering disaster management plan in coastal low-lying areas. We applied the seamlessly integrated model to the highly urbanized Tsurumi River basin and investigated inundation characteristics by considering multiple flood causing factors.

    DOI: 10.2208/kaigan.72.I_517

    researchmap

  • Detection of pepper mild mottle virus as an indicator for drinking water quality in Hanoi, Vietnam, in large volume of water after household treatment Reviewed

    Jatuwat Sangsanont, Dang The Dan, Tran Thi Viet Nga, Hiroyuki Katayama, Hiroaki Furumai

    JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING   51 ( 13 )   1100 - 1106   2016

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:TAYLOR & FRANCIS INC  

    The aims of this study were to examine the removal of bacteria and viruses by household point-of-use (POU) treatments and to apply a previously developed large-volume virus concentration method (approximate to 20L). First, the removal of microbes by household POU treatment was investigated in the laboratory. Second, the prevalence of viruses in drinking water sources for households and the removal efficiency of microbes by POU treatments in two suburban communities in Hanoi, Vietnam, were investigated. Indigenous pepper mild mottle virus (PMMoV) was used as the main target together with adenovirus, Aichi virus, enterovirus, F-specific bacteriophage genogroup 1, and Escherichia coli to investigate the removal efficiency of household treatments. The results from laboratory and field survey were compared. From the laboratory study, ceramic membranes were not effective for removing viruses and bacteria from water; pathogen reduction was less than 1.5log(10). By contrast, reverse osmosis (RO) devices reduced microbes by 3 to &gt; 5log(10). In a field study, PMMoV was found to be the most prevalent waterborne virus. Household sand filtration was ineffective for removing E. coli, total coliforms and PMMoV; the reduction was less than 1 order of magnitude. Boiling the water and then filtering it with a ceramic membrane reduced E. coli by 3 orders of magnitude, but this was not effective for removing PMMoV. RO filtration was one of the promising methods for removing E. coli, total coliforms and PMMoV to below their detection limits in most of the samples studied. The removal of E. coli, total coliforms and PMMoV was &gt;2.3, &gt;4 and &gt;3log(10), respectively. The laboratory results of virus removal efficiency by POU devices agreed with the field study. Due to the prevalence and characteristics of PMMoV, it is a strong candidate for an indigenous indicator to investigate the viral removal efficiency of household POU treatments.

    DOI: 10.1080/10934529.2016.1199650

    Web of Science

    researchmap

  • Impacts of urbanization on the prevalence of antibiotic-resistant Escherichia coli in the Chaophraya River and its tributaries. Reviewed

    Honda, Ryo, Watanabe, Toru, Sawaittayotin, Variga, Masago, Yoshifumi, Chulasak, Rungnapa, Tanong, Kulchaya, Chaminda, G Tushara, Wongsila, Krison, Sienglum, Chawala, Sunthonwatthanaphong, Varisara, Poonnotok, Anupong, Chiemchaisri, Wilai, Chiemchaisri, Chart, Furumai, Hiroaki, Yamamoto, Kazuo

    Water science and technology : a journal of the International Association on Water Pollution Research   73 ( 2 )   362 - 374   2016

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IWA PUBLISHING  

    River water samples were taken from 32 locations around the basin of Chaophraya River and its four major tributaries in Thailand to investigate resistance ratios of Escherichia coli isolates to eight antibiotic agents of amoxicillin, sulfamethoxazole/trimethoprim, tetracycline, doxytetracycline, ciprofloxacin, levofloxacin, norfloxacin and ofloxacin. Principal component analysis was performed to characterize resistance patterns of the samples. Relevancy of the obtained principal components with urban land use and fecal contamination of the river were examined. The ratio of antibiotic-resistant bacteria is likely to increase when urban land use near the sampling site exceeds a certain ratio. The resistance ratio to fluoroquinolones tends to be high in a highly populated area. Meanwhile, no significant contribution of fecal contamination was found to increase the resistance ratio. These results suggest that an antibiotic-resistance ratio is dependent on conditions of local urbanization rather than the upstream conditions, and that the major sources of antibiotic-resistant bacteria in the Chaophraya River basin are possibly point sources located in the urban area which contains a high ratio of resistant bacteria.

    DOI: 10.2166/wst.2015.502

    Web of Science

    PubMed

    researchmap

  • Multi-purpose rainwater harvesting for water resource recovery and the cooling effect Reviewed

    Kyoung Jin An, Yun Fat Lam, Song Hao, Tobi Eniolu Morakinyo, Hiroaki Furumai

    WATER RESEARCH   86   116 - 121   2015.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    The potential use of rainwater harvesting in conjunction with miscellaneous water supplies and a rooftop garden with rainwater harvesting facility for temperature reduction have been evaluated in this study for Hong Kong. Various water applications such as toilet flushing and areal climate controls have been systematically considered depending on the availability of seawater toilet flushing using the Geographic Information System (GIS). For water supplies, the district Area Precipitation per Demand Ratio (APDR) has been calculated to quantify the rainwater utilization potential of each administrative district in Hong Kong. Districts with freshwater toilet flushing prove to have higher potential for rainwater harvest and utilization compared to the areas with seawater toilet flushing. Furthermore, the effectiveness of using rainwater harvesting for miscellaneous water supplies in Hong Kong and Tokyo has been analyzed and compared; this revives serious consideration of diurnal and seasonal patterns of rainfall in applying such technology. In terms of the cooling effect, the implementation of a rooftop rainwater harvesting garden has been evaluated using the ENVI-met model. Our results show that a temperature drop of 1.3 degrees C has been observed due to the rainwater layer in the rain garden. This study provides valuable insight into the applicability of the rainwater harvesting for sustainable water management practice in a highly urbanized city. (c) 2015 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.watres.2015.07.040

    Web of Science

    researchmap

  • Characterization of toxicants in urban road dust by toxicity identification evaluation using ostracod Heterocypris incongruens direct contact test Reviewed

    Rajendra Khanal, Hiroaki Furumai, Fumiyuki Nakajima

    Science of the Total Environment   530-531   96 - 102   2015.10

     More details

    Language:English  

    The current study involves characterization of organic compounds, heavy metals, and ammonia as potential toxicants in one arterial road (St. 3) and two highway (St. 7 and 8) urban road dust (URD) collected in Tokyo, Japan. URD toxicity was evaluated by Toxicity Identification Evaluation using the ostracod Heterocypris incongruens direct contact test. URDs were treated with resins (10% XAD-4, 20% SIR-300 and 20% SIR-600) to determine the reduction in mortality after treatment. The mortality of ostracods exposed to St. 3 URD (baseline 80%) was significantly (p&lt;0.05) reduced to 0% and 47% after XAD-4 and SIR-300 treatment respectively. This reduction led us to suspect hydrophobic organic compounds and heavy metals as potential toxicants. Subsequent elution of the recovered XAD-4 with polar (methanol, acetone) and non-polar (dichloromethane) solvents confirmed the dominance of relatively polar hydrophobic organic toxicants. The dissolved concentration of Cu and Zn after SIR-300 treatment exceeded the 50% lethal concentration (LC50) for ostracods, which led us to suspect Cu and Zn as other probable toxicants. The concentration of Zn in a SIR-300 acidic elutriate, recovered after the termination of toxicity test, confirmed Zn as one of the toxicants in St. 3. The baseline mortality (100%) of St. 7 was significantly reduced (23%) by SIR-300 treatment. This indicated the presence of heavy metals as the probable toxicant. However, the concentration of dissolved heavy metals (Cd, Cr, Cu, Ni, Pb and Zn) in the overlying water was below previously reported LC50 values for each metal in St. 7. Recovery of Zn concentrations exceeding the LC50 in the St. 7 SIR-300 elutriate led us to suspect a dietary exposure route of Zn to the ostracod during the direct contact test. The overall results indicate that the toxicant types can vary widely depending on the road sampled.

    DOI: 10.1016/j.scitotenv.2015.05.090

    researchmap

  • Identification of estrone-degrading Betaproteobacteria in activated sludge by microautoradiography fluorescent in situ hybridization Reviewed

    F. Kurisu, K. Zang, I. Kasuga, H. Furumai, O. Yagi

    LETTERS IN APPLIED MICROBIOLOGY   61 ( 1 )   28 - 35   2015.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-BLACKWELL  

    Natural oestrogens, which are degraded but not completely removed in wastewater treatment plants, are suspected of causing the endocrine disruption of aquatic organisms in the receiving water body. While several bacterial isolates were reported to be oestrogen-degrading bacteria, our previous study implied that only the unidentified rod-shaped Betaproteobacteria in chains were responsible for estrone (E1) degradation by activated sludge especially at the sub-milligram per litre level. The Betaproteobacteria were suspected to be related to genera Sphaerotilus and Leptothrix according to morphological observations. Probe Spha823 was newly developed to target 16S rRNA gene clones obtained from activated sludge and closely related to the above genera. [H-3]E1-incubated sludge samples showed that most of the H-3-labelled cells hybridized with probe Spha823 by microautoradiography (MAR) fluorescent in situ hybridization. Spha823-defined cells were present in all three activated sludge samples tested, where they accounted for up to 3% of the total microbial biomass. Spha823-defined cells comprised 595-801% of the total MAR-positive cells, which suggested that the Sphaerotilus-Leptothrix-related bacteria were the most abundant micro-organisms involved in E1 degradation (at 200gl(-1)) in the activated sludge samples.
    Significance and Impact of the StudyEstrone (E1) is one of the natural estrogens, which can be degraded but is not always completely removed in wastewater treatment plants. E1 is suspected of causing the endocrine disruption of aquatic organisms in the receiving water body. We identified dominant E1-incorporating bacteria, which should include E1-degrading bacteria, in activated sludge treating domestic wastewater. Sphaerotilus-Leptothrix-related bacteria, which had never been reported in the previous attempts based on culture-dependent approach, occupied 60-80% of the E1-incorporating bacteria. This study demonstrates the identification of functionally active bacteria to degrade micro-pollutants at sub-milligram per litre level.

    DOI: 10.1111/lam.12407

    Web of Science

    researchmap

  • Characterisation of prolonged deposits of organic matter in infiltration system inlets and their binding with heavy metals: A PARAFAC approach Reviewed

    Rupak Aryal, Hiroaki Furumai, Fumiyuki Nakajima, Simon Beecham, Jaya Kandasamy

    Water, Air, & Soil Pollution   226 ( 175 )   2015.6

     More details

    Language:English  

    This study investigated and characterised organic matter present in sediment particles deposited in infiltration facilities using an excitation-emission matrix method combined with parallel factor analysis (EEM-PARAFAC). The organic fluorophore identified was correlated with sediment bound metals. The PARAFAC analysis identified three major components. The fluorophore in each of the three components appeared in different locations with different spectral shapes. The maximum fluorescence intensity (F max) observed for each fluorescent component was correlated with seven heavy metals (Cr, Mn, Co, Ni, Cu, Zn and Pb). F max of component 1 displayed a negative relationship with all the metals (correlation coefficient = ?0.28 to ?0.72), and F max of component 3 showed a positive relationship (0.20 to 0.62), and among them, Cu, Ni and Zn had higher correlation. Our results demonstrate that a PARAFAC approach can help to further elucidate organic matter species, thereby allowing a better understanding of the mobility of elemental species in the deposited sediment.

    DOI: 10.1007/s11270-015-2426-2

    researchmap

  • Analysis of the built-up processes for volatile organics and heavy metals in suspended solids from road run-off Reviewed

    Rupak Aryal, Hiroaki Furumai, Fumiyuki Nakajima, Simon Beecham, Byeong-Kyu Lee

    Desalination and Water Treatment   54   1254 - 1259   2015

     More details

    Language:English  

    Road run-off water quality can be significantly impacted by many pollutants deposited on road surfaces through vehicular activities. Any control strategy for the improvement of water quality relating to organic and inorganic pollutants should be based on a detailed knowledge of pollutant built-up processes and the relationship of pollutants to one another. Total volatile suspended solids (VSS), polycyclic aromatic hydrocarbons (PAHs) and heavy metals were estimated in total suspended solids (TSS) collected in two catchments. This study found a good relationship between total VSS and TSS and between TSS and PAHs. This relationship information can be utilized for the development of effective Best Management Practices for TSS control. However, the relationship between TSS and heavy metals was identified as being strong in only some cases.

    DOI: 10.1080/19443994.2014.955827

    researchmap

  • Wastewater Analysis Indicates that Genetically Diverse Astroviruses, Including Strains Belonging to Novel Clades MLB and VA, are Circulating Within Japanese Populations. Reviewed

    Akihiko Hata, Hiroyuki Katayama, Masaaki Kitajima, Hiroaki Furumai

    Applied and Environmental Microbiology   81 ( 15 )   4932 - 4939   2015

     More details

    Language:English  

    DOI: 10.1128/AEM.00563-15

    researchmap

  • Organic Substances Interfere with Reverse Transcription-Quantitative PCR-Based Virus Detection in Water Samples. Reviewed

    Akihiko Hata, Hiroyuki Katayama, Hiroaki Furumai

    Applied and Environmental Microbiology   81 ( 5 )   1585 - 1593   2015

     More details

    Language:English  

    DOI: 10.1128/AEM.03082-14

    researchmap

  • Capsid-Damaging Effects of UV Irradiation as Measured by Quantitative PCR Coupled with Ethidium Monoazide Treatment Reviewed

    J. Sangsanont, H. Katayama, F. Kurisu, H. Furumai

    FOOD AND ENVIRONMENTAL VIROLOGY   6 ( 4 )   269 - 275   2014.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    The damage to a viral capsid after low-pressure (LP) and medium-pressure (MP) UV irradiation was assessed, using the quantitative or quantitative reverse transcription PCR coupled with ethidium monoazide treatment (EMA-PCR). After UV irradiation, adenovirus 5 (Ad5) and poliovirus 1 (PV1) were subjected to a plaque assay, PCR, and EMA-PCR to investigate the effect of UV irradiation on viral infectivity, genome damage, and capsid damage, respectively. The effectiveness of UV wavelengths in a viral genome and capsid damage of both PV1 and Ad5 was also further investigated using a band-pass filter. It was found that an MPUV lamp was more effective than an LPUV lamp in inactivating Ad5, whereas there was no difference in the case of PV1. The results of viral reduction determined by PCR and EMA-PCR indicated that MP UV irradiation damaged Ad5 capsid. The damage to PV1 and Ad5 capsid was also not observed after LP UV irradiation. The investigation of effects of UV wavelengths suggested that UV wavelengths at 230-245 nm have greater effects on adenovirus capsid in addition to viral genome than UV wavelengths beyond 245 nm.

    DOI: 10.1007/s12560-014-9162-4

    Web of Science

    researchmap

  • Time-Resolved DNA Stable Isotope Probing Links Desulfobacterales- and Coriobacteriaceae-Related Bacteria to Anaerobic Degradation of Benzene under Methanogenic Conditions Reviewed

    Mana Noguchi, Futoshi Kurisu, Ikuro Kasuga, Hiroaki Furumai

    MICROBES AND ENVIRONMENTS   29 ( 2 )   191 - 199   2014.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPANESE SOC MICROBIAL ECOLOGY, DEPT BIORESOURCE SCIENCE  

    To identify the microorganisms involved in benzene degradation, DNA-stable isotope probing (SIP) with C-13-benzene was applied to a methanogenic benzene-degrading enrichment culture. Pyrosequencing of ribosomal RNA (rRNA) gene sequences revealed that the community structure was highly complex in spite of a 3-year incubation only with benzene. The culture degraded 98% of approximately 1 mM C-13-benzene and mineralized 72% of that within 63 d. The terminal restriction fragment length polymorphism (T-RFLP) profiles of the buoyant density fractions revealed the incorporation of C-13 into two phylotypes after 64 d. These two phylotypes were determined to be Desulfobacterales- and Coriobacteriaceae-related bacteria by cloning and sequencing of the 16S rRNA gene in the C-13-labeled DNA abundant fraction. Comparative pyrosequencing analysis of the buoyant density fractions of C-12- and C-13-labeled samples indicated the incorporation of C-13 into three bacterial and one archaeal OTUs related to Desulfobacterales, Coriobacteriales, Rhodocyclaceae, and Methanosarcinales. The first two OTUs included the bacteria detected by T-RFLP-cloning-sequencing analysis. Furthermore, time-resolved SIP analysis confirmed that the activity of all these microbes appeared at the earliest stage of degradation. In this methanogenic culture, Desulfobacterales- and Coriobacteriaceae-related bacteria were most likely to be the major benzene degraders.

    DOI: 10.1264/jsme2.ME13104

    Web of Science

    researchmap

  • Effects of rainfall events on the occurrence and detection efficiency of viruses in river water impacted by combined sewer overflows Reviewed

    Akihiko Hata, Hiroyuki Katayama, Keisuke Kojima, Shoichi Sano, Ikuro Kasuga, Masaaki Kitajima, Hiroaki Furumai

    SCIENCE OF THE TOTAL ENVIRONMENT   468   757 - 763   2014.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Rainfall events can introduce large amount of microbial contaminants including human enteric viruses into surface water by intermittent discharges from combined sewer overflows (CSOs). The present study aimed to investigate the effect of rainfall events on viral loads in surface waters impacted by CSO and the reliability of molecular methods for detection of enteric viruses. The reliability of virus detection in the samples was assessed by using process controls for virus concentration, nucleic acid extraction and reverse transcription (RT)-quantitative PCR (qPCR) steps, which allowed accurate estimation of virus detection efficiencies. Recovery efficiencies of poliovirus in river water samples collected during rainfall events (&lt;10%) were lower than those during dry weather conditions (&gt;10%). The log(10)-transformed virus concentration efficiency was negatively correlated with suspended solid concentration (r(2) = 0.86) that increased significantly during rainfall events. Efficiencies of DNA extraction and qPCR steps determined with adenovirus type 5 and a primer sharing control, respectively, were lower in dry weather. However, no clear relationship was observed between organic water quality parameters and efficiencies of these two steps. Observed concentrations of indigenous enteric adenoviruses, GII-noroviruses, enteroviruses, and Aichi viruses increased during rainfall events even though the virus concentration efficiency was presumed to be lower than in dry weather. The present study highlights the importance of using appropriate process controls to evaluate accurately the concentration of water borne enteric viruses in natural waters impacted by wastewater discharge, stormwater, and CSOs. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.scitotenv.2013.08.093

    Web of Science

    researchmap

  • Toxicity assessment of size-fractionated urban road dust using ostracod Heterocypris incongruens direct contact test Reviewed

    Rajendra Khanal, Hiroaki Furumai, Fumiyuki Nakajima

    JOURNAL OF HAZARDOUS MATERIALS   264   53 - 64   2014.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Urban road dusts (URDs, n =10) were collected from arterial, residential, parking area in highway and highway roads in and around Tokyo, Japan, to characterize toxicity of size-fractions by the ostracod Heterocypris incongruens direct contact test. The URDs were collected with vacuum cleaner and highway sweeping vehicles, dried and size-fractionated before conducting toxicity test. The LC20 and LC50 of URDs varied (v/v) from 1.6 to 49%, and 3.8 to 67% respectively. Cluster analysis of URDs based on the concentration of heavy metal and PAHs standardized with the organic matter content was able to differentiate URDs into two groups, one group of higher toxicity and the other group of medium and lower toxicity. Mortality of ostracod decreased for some of the URDs when holding time of URD-water mixture was changed from 1 h to 24 h prior to the toxicity test. Fraction of fine particles was not always more toxic than the other fractions of coarse and medium particles. Site specific differences in toxicity of size-fractionated URDs indicated the complexity in defining URD toxicity as there could be co-existence of various non-targeted toxicants. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jhazmat.2013.10.058

    Web of Science

    researchmap

  • Characterization of water pollution in drainage networks using continuous monitoring data in the Citadel area of Hue City, Vietnam Reviewed

    Y. Nagano, T. Teraguchi, P. K. Lieu, H. Furumai

    WATER SCIENCE AND TECHNOLOGY   70 ( 4 )   612 - 619   2014

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IWA PUBLISHING  

    In the Citadel area of Hue City, drainage systems that include canals and ponds are considerable sources of fecal contaminants to inundated water during the rainy season because canals and ponds receive untreated wastewater. It is important to investigate the characteristics of hydraulics and water pollution in canals and ponds. At the canals and ponds, water sampling was conducted during dry and wet weather periods in order to evaluate fecal contamination and to investigate changes in water pollution caused by runoff inflow. Inundated water was also collected from streets during heavy rainfall. At the canals and ponds, concentrations of Escherichia coli and total coliform exceeded the Vietnamese regulation values for surface water in 23 and 24 out of 27 samples (85 and 89%), respectively. The water samples were categorized based on the characteristics of water pollution using cluster analysis. In the rainy season, continuous monitoring was conducted at the canals and ponds using water depth and electrical conductivity (EC) sensors to investigate the dynamic relationship between water level and water pollution. It is suggested that in the canals, high EC meant water stagnation and low EC signified river water inflow. Therefore, EC might be a good indicator of water flow change in canals.

    DOI: 10.2166/wst.2014.243

    Web of Science

    researchmap

  • Model evaluation of faecal contamination in coastal areas affected by urban rivers receiving combined sewer overflows Reviewed

    T. Shibata, K. Kojima, S. A. Lee, H. Furumai

    WATER SCIENCE AND TECHNOLOGY   70 ( 3 )   430 - 436   2014

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IWA PUBLISHING  

    Odaiba seaside park is one of the most popular waterfronts in Tokyo Bay, but is easily affected by wet weather pollutant loads through combined sewer overflows (CSOs). The monitoring data of Escherichia coli clearly showed high faecal contamination after a rainfall event on 9-11 November 2007. We estimated the amounts of discharge volume and E. coli pollutant loads of urban rivers receiving CSO from rainfall chambers as well as pumping stations and primary effluent discharge. The result suggested that Sumida River and Meguro River were more influential to the Odaiba coastal area than other sources including the nearest wastewater treatment plant. Subsequently, we simulated the dynamic behaviour of E. coli by a three-dimensional (3D) hydro-dynamic and water quality model. The model simulation reproduced that E. coli concentration after the rainfall event increased rapidly at first and later gradually decreased. The simulations with and without inflow pollutant loads from urban rivers suggested that the E. coli concentration can be influenced by the Meguro River just after the rainfall event and Sumida River about 1 week later. From the spatial and temporal distribution of surface E. coli concentration, after at least 6 days from the rainfall event, high faecal contamination spread to the whole of the coastal area.

    DOI: 10.2166/wst.2014.225

    Web of Science

    researchmap

  • Benzene and Toluene Biodegradation Potential in Methanogenic Cultures Established by Feeding Benzene, Toluene and their Mixture

    MASUMOTO Hiroki, KURISU Futoshi, KASUGA Ikuro, FURUMAI Hiroaki

    J. of Wat. & Envir. Tech.   12 ( 2 )   77 - 86   2014

     More details

    Language:English   Publisher:Japan Society on Water Environment  

    Benzene and toluene often contaminate groundwater and pose serious threat to human health due to their high toxicity. Anaerobic degradation can be a cost-effective method but the degradation mechanism remains poorly understood. We established benzene- and/or toluene-degrading bacterial cultures under methanogenic conditions from non-contaminated soil to compare their behaviour during and after enrichment. Benzene and toluene degradation rates increased during incubation, and this fact implied enrichment and/or adaptation of benzene/toluene-degrading microorganisms. The abundance of Hasda-A and/or related bacteria, defined by a primer set targeting uncultured putative benzene-degrading Desulfobacterales bacterium Hasda-A, increased only in the enrichments fed with benzene. This result indicated that Hasda-A and/or related bacteria played an important role on benzene degradation. Furthermore, to investigate the biodegradation range of benzene and toluene degraders, we added both benzene and toluene to all cultures. Toluene or benzene was also degraded by cultures that have been fed with benzene or toluene, respectively. The culture which was originally fed only with toluene had smaller benzene degradation rate than the culture fed with benzene. Similar result was obtained for toluene degradation in cultures fed with toluene or benzene. These data indicate that different microorganisms were likely involved in benzene and toluene degradation in our enrichments.

    DOI: 10.2965/jwet.2014.77

    researchmap

  • Autotrophic growth competition between ammonia-oxidizing archaea and ammonia-oxidizing bacteria in biological activated carbon filter with nitrification potential Reviewed

    I. Kasuga, J. Niu, F. Kurisu, H. Furumai, T. Shigeeda

    PROGRESS IN SLOW SAND AND ALTERNATIVE BIOFILTRATION PROCESSES: FURTHER DEVELOPMENTS AND APPLICATIONS   379 - 385   2014

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IWA PUBLISHING  

    Biological activated carbon (BAC) filtration combined with preceding ozone oxidation has been established as a major advanced drinking water purification process. One of the most important functions of BAC is the biological oxidation of ammonia, which can serve as a precursor for odourous trichloramine. The activity of ammonia-oxidizing microorganisms in the BAC filter is related to the nitrification performance of BAC. In the present study, autotrophic growth competitions between ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) associated with BAC were evaluated by DNA stable isotope probing. When low levels of ammonium (0.14 mg N/L) were continuously supplied to BAC collected from a full-scale drinking water purification plant in Tokyo, AOA rather than AOB demonstrated higher autotrophic growth activity following 7 days of incubation. After 28 days, both AOA and AOB showed autotrophic growth. These results indicate that AOA outcompete AOB for the oxidation of low levels of ammonium in BAC filters.

    Web of Science

    researchmap

  • Molecular characterization of dissolved organic matter in various urban water resources using Orbitrap Fourier transform mass spectrometry Reviewed

    M. Urai, I. Kasuga, F. Kurisu, H. Furumai

    WATER SCIENCE AND TECHNOLOGY-WATER SUPPLY   14 ( 4 )   547 - 553   2014

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IWA PUBLISHING  

    Molecular-level characterization of dissolved organic matter (DOM) in different urban water resources (river water, groundwater, reclaimed water, and rainwater) was performed by Orbitrap Fourier transform mass spectrometry (FT-MS). The mass spectra, which were fingerprints of DOM composition, were clearly different among samples. Based on accurate molecular mass determination, about 300 molecular formulae were identified. Most of the DOM molecules were composed of carbon, hydrogen and oxygen. Molecular formulae in river water consisted of CHO mostly and much less N- and S-containing compounds than other water samples. The percentage of CHO molecules was the highest for reclaimed water. The reclaimed water sample was characterized by a few peaks with strong intensities, which were presumed to be linear alkylbenzene sulfonates, their co-products and their biodegradation products based on their molecular formulae. Some of these compounds were also detected from river water, probably indicating the impact of wastewater treatment plants located upstream of the sampling point. Orbitrap FT-MS analysis is a powerful tool to discriminate DOM composition of urban water resources.

    DOI: 10.2166/ws.2014.006

    Web of Science

    researchmap

  • Evaluation of autotrophic growth of ammonia-oxidizers associated with granular activated carbon used for drinking water purification by DNA-stable isotope probing Reviewed

    Niu Jia, Kasuga Ikuro, Kurisu Futoshi, Furumai Hiroaki, Shigeeda Takaaki

    WATER RESEARCH   47 ( 19 )   7053 - 7065   2013.12

  • Tracing source and distribution of heavy metals in road dust, soil and soakaway sediment through speciation and isotopic fingerprinting Reviewed

    Kumar Manish, Furumai Hiroaki, Kurisu Futoshi, Kasuga Ikuro

    GEODERMA   211   8 - 17   2013.12

  • The concept of environmental leader

    Tomohiro Akiyama, Kyoungjin J. An, Hiroaki Furumai, Hiroyuki Katayama

    Environmental Leadership Capacity Building in Higher Education: Experience and Lessons from Asian Program for Incubation of Environmental Leaders   9784431543404   19 - 40   2013.8

     More details

    Publishing type:Part of collection (book)  

    Leadership has shifted focus from the individual to the group or institute. Efforts to link leadership and the natural environment have already begun and the necessity for environmental leadership has never been higher than ever in the era of complex and evident environmental and social problems, such as climate change, global conflict, limited resources, an overwhelming amount information, etc. There is no single solution for environmental problems that can solve the conflicts of diversified community relations. Therefore, environmental leadership development is a priority element for improving the deteriorating environment. However, the current education system, especially in Asia, lacking in providing a holistic view of environmental issues, as well as inter- or trans-disciplinary and cross-cultural approaches, or a balance between the environmental, economic and social dimensions, using hands-on experience. In response, APIEL strives to fill this gap by improving education for environmental leadership with sustainability issues in mind. This chapter will review the concept of the environmental leader through a discourse on leadership. As well, it will introduce the authors' experiences in fostering environmental leader by establishing and implementing environmental leadership education over the past four years. The discourse on environmental leadership illustrates how environmental leaders have been educated to cope with emerging environmental issues. The concepts of transformational/transformative-, eco-, collective, green, and communicative leadership provide a map to understand the evolution of the theory and practice of environmental leadership education.

    DOI: 10.1007/978-4-431-54340-4_2

    Scopus

    researchmap

  • Sensitive and substrate-specific detection of metabolically active microorganisms in natural microbial consortia using community isotope arrays. Reviewed

    Tourlousse DM, Kurisu F, Tobino T, Furumai H

    FEMS microbiology letters   342 ( 1 )   70 - 75   2013.5

  • Evaluation of microbial regrowth potential by assimilable organic carbon in various reclaimed water and distribution systems. Reviewed

    Thayanukul P, Kurisu F, Kasuga I, Furumai H

    Water research   47 ( 1 )   225 - 232   2013.1

  • Potential mobility of heavy metals through coupled application of sequential extraction and isotopic exchange: comparison of leaching tests applied to soil and soakaway sediment. Reviewed

    Kumar M, Furumai H, Kurisu F, Kasuga I

    Chemosphere   90 ( 2 )   796 - 804   2013.1

  • Characterization of bacterial isolates from water reclamation systems on the basis of substrate utilization patterns and regrowth potential in reclaimed water Reviewed

    Thayanukul Parinda, Kurisu Futoshi, Kasuga Ikuro, Furumai Hiroaki

    WATER SCIENCE AND TECHNOLOGY   68 ( 7 )   1556 - 1565   2013

  • Application of whole sediment toxicity identification evaluation procedures to road dust using a benthic ostracod Heterocypris incongruens Reviewed

    Haruna Watanabe, Fumiyuki Nakajima, Ikuro Kasuga, Hiroaki Furumai

    Ecotoxicology and Environmental Safety   89   245 - 251   2013

     More details

    Language:English  

    Road dust is considered to be an important source of sediment contamination in receiving water bodies; however, few studies have evaluated the toxicity of road dust to benthic organisms. This study evaluated the toxicity of road dust to a benthic ostracod, Heterocypris incongruens, using a six-day direct exposure experiment. We applied whole sediment toxicity identification evaluation (TIE) methods to identify the primary group of toxicants in road dust. Three road dust samples from Tokyo caused high ostracod mortality. The addition of hydrophobic adsorbents, Ambersorb and XAD, eliminated toxicity in all samples, suggesting that hydrophobic compounds were the main toxicants in road dust samples. A cation exchange resin, Chelex, also reduced the toxicity of two samples, although the measured concentrations of dissolved heavy metals in the test solution did not exceed the LC50 values in the literature. In addition, the sum of toxic unit (TU=measured concentration/LC50) of each individual metal which predicts the toxicity of the metal mixtures did not exceed 1.0 in all samples, suggesting that heavy metal mixtures did not have additive effects. We hypothesized that the toxicity reduction by XAD and Chelex was due to the removal of hydrophobic compounds, rather than heavy metals. Thus, a toxicity test was conducted on fractions eluted with organic solvents from the XAD and Chelex recovered from one of the road dust samples. Methanol-eluted fractions of XAD and Chelex showed 100 percent ostracod mortality, indicating that the hydrophobic organic compounds removed by these adsorbents were the principal toxicants in the road dust sample.

    DOI: 10.1016/j.ecoenv.2012.12.003

    researchmap

  • Metal (Zn, Cu, Cd and Ni) complexation by dissolved organic matter (DOM) in waste water treatment plant effluent Reviewed

    G.G Tushara Chaminda, Fumiyuki Nakajima, Hiroaki Furumai, Ikuro Kasuga, Futoshi Kurisu

    Journal of Water and Environment Technology   11 ( 3 )   153 - 161   2013

     More details

    Language:English  

    Eight effluent samples were collected from four conventional activated sludge wastewater treatment plants (WWTPs) to determine the complexation of Zn, Cu, Cd and Ni by dissolved organic matter (DOM) in WWTP effluent. The collected effluents were subjected to determine the labile Zn, Cu, Cd and Ni concentrations using EmporeTM chelating disk cartridge. It was observed that more than 55% of the dissolved metals were strongly complexed by ligands in the effluents. In addition, the Zn, Cu and Cd titration data obtained by square wave anodic stripping voltammetry were interpreted with Scatchard linearization to determine the conditional stability constant and the total binding site concentrations of DOM in three of the WWTP effluents. The titration data for Zn and Cu fitted to a two-ligand system while Cd data represented a one-ligand system. The conditional stability constant for Cu was greater than that for Zn with DOM in WWTP effluents. Zinc complexation parameters in natural organic matter (river water DOM and Suwanee River humic substances) were also compared with those of DOM in WWTP effluents. The results demonstrated higher stability constant and higher binding site concentrations for the DOM in WWTP effluents than the natural organic matter.

    DOI: 10.2965/jwet.2013.153

    researchmap

  • Variation in PAH patterns in road runoff Reviewed

    Rupak Aryal, Hiroaki Furumai, Fumiyuki Nakajima, Simon Beecham

    Water Science & Technology   67 ( 12 )   2699 - 2705   2013

     More details

    Language:English  

    Twelve particle-bound polycyclic aromatic hydrocarbons (PAHs) were measured in the first flush regime of road runoff during nine events in Winterthur in Switzerland. The total PAH contents ranged from 17 to 62 μg/g. The PAH patterns measured at different time intervals during the first flush periods were very similar within each event irrespective of variation in suspended solids (SS) concentration within the first flush regime. However, the PAH patterns were different from event to event. This indicates that the environment plays an important role in PAH accumulation in SS. A toxicity identification evaluation approach using a toxicity equivalency factor (TEF) was applied to compare toxicities in the different events. The TEFs were found to be between 8 and 33 μg TEQ g(-1) (TEQ: toxic equivalent concentration). In some cases, two events having similar total PAH contents showed two fold toxicity differences.

    DOI: 10.2166/wst.2013.172

    researchmap

  • Identification of Glucose- and Acetate-Assimilating Bacteria in Activated Sludge by DNA Stable Isotope Probing

    KIDO Yuki, KASUGA Ikuro, KURISU Futoshi, FURUMAI Hiroaki

    Japan journal of water pollution research   36 ( 3 )   77 - 83   2013

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    Elucidating the function of the microbial community in activated sludge is the key to understanding its treatment mechanism. Although the removal of organic matter is one of the major functions of a microbial community, the substrate utilization of each microorganism remains to be fully elucidated. In this study, DNA stable isotope probing (DNA-SIP) was applied to the analysis of activated sludge collected from a full-scale wastewater treatment plant to identify glucose- and acetate-assimilating bacteria. Activated sludge was fed with 13C-labelled glucose and 13C-labelled acetate individually and incubated for 60 hours. Two different substrate concentrations (100 mgC·L-1, 1000 mgC·L-1) with the same loading (300 mgC) were tested for glucose, while only one substrate concentration (100 mgC·L-1, 300 mgC of loading) was tested for acetate. The DNA-SIP experiment clearly revealed that glucose was assimilated by bacteria closely related to Aeromonas, Enterobacteriaceae, and Tolumonas regardless of substrate concentration or activated sludge collected on a different day. On the other hand, a different group of bacteria closely related to Acidovorax, Acinetobacter, and Dechloromonas was identified as acetate-assimilating bacteria. Although specific glucose- and acetate-assimilating bacteria responded to glucose and acetate, most of them were not predominant in the original sludge.

    DOI: 10.2965/jswe.36.77

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/10018471457?from=CiNii

  • Cluster analysis for characterization of rainfalls and CSO behaviours in an urban drainage area of Tokyo Reviewed

    Yang Yu, Keisuke Kojima, Kyoungjin An, Hiroaki Furumai

    WATER SCIENCE AND TECHNOLOGY   68 ( 3 )   544 - 551   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IWA PUBLISHING  

    Combined sewer overflow (CSO) from urban areas is recognized as a major pollutant source to the receiving waters during wet weather. This study attempts to categorize rainfall events and corresponding CSO behaviours to reveal the relationship between rainfall patterns and CSO behaviours in the Shingashi urban drainage areas of Tokyo, Japan where complete service by a combined sewer system (CSS) and CSO often takes place. In addition, outfalls based on their annual overflow behaviours were characterized for effective storm water management. All 117 rainfall events recorded in 2007 were simulated by a distributed model InfoWorks CS to obtain CSO behaviours. The rainfall events were classified based on two sets of parameters of rainfall pattern as well as CSO behaviours. Clustered rainfall and CSO groups were linked by similarity analysis. Results showed that both small and extreme rainfalls had strong correlations with the CSO behaviours, while moderate rainfall had a weak relationship. This indicates that important and negligible rainfalls from the viewpoint of CSO could be identified by rainfall patterns, while influences from the drainage area and network should be taken into account when estimating moderate rainfall-induced CSO. Additionally, outfalls were finally categorized into six groups indicating different levels of impact on the environment.

    DOI: 10.2166/wst.2013.253

    Web of Science

    researchmap

  • Assessment of Rainwater Availability by Building Type and Water Use Through GIS-based Scenario Analysis Reviewed

    Jinyoung Kim, Hiroaki Furumai

    WATER RESOURCES MANAGEMENT   26 ( 6 )   1499 - 1511   2012.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    Scenario analysis of rainwater harvesting and utilization (RWHU) was performed considering various non-potable water uses in different building types over a year. Six building types were identified in the study area using GIS data: residential houses, offices, commercial buildings, restaurants, public buildings, and "others". Rainwater storage capacity was considered as 30 mm rainwater depth. Water demand for each building type was calculated as the sum of the individual water uses for toilet flushing, air conditioning, garden irrigation, and cleaning defined in this study as "miscellaneous usages". To incorporate water quality considerations, rainwater with suspended solids level of less than 2 mg l(-1) was used as the quality criterion. The RWHU scenario was compared with other storage and water use scenarios. This study quantified the rainwater availability throughout a year and its seasonal variation and consumption in each building type. The analysis clarified the effectiveness of rainwater utilization for supplementing existing water resources.

    DOI: 10.1007/s11269-011-9969-9

    Web of Science

    researchmap

  • Specificity of randomly generated genomic DNA fragment probes on a DNA array. Reviewed

    Tobino T, Kurisu F, Kasuga I, Furumai H

    FEMS microbiology letters   328 ( 1 )   86 - 89   2012.3

  • Molecular detection and genotyping of human noroviruses in influent and effluent water at a wastewater treatment plant in Japan Reviewed

    M. Kitajima, E. Haramoto, C. Phanuwan, H. Katayama, H. Furumai

    JOURNAL OF APPLIED MICROBIOLOGY   112 ( 3 )   605 - 613   2012.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-BLACKWELL  

    Aims: To investigate the prevalence, seasonality and genotype distribution of human noroviruses (NoVs) in wastewater in Japan.
    Methods and Results: Influent and effluent water samples were collected monthly for a year from a wastewater treatment plant and examined for the presence of genogroups I and II (GI and GII) NoVs. Using real-time reverse transcription (RT)-PCR assays, 12 (100%) influent and six (50%) effluent samples were positive for both GI and GII NoV genomes, with a higher prevalence in winter. A total of 152 different NoV strains, comprising 84 GI and 68 GII strains, were identified using seminested RT-PCR assays followed by cloning and sequence analysis. These strains were classified into nine GI genotypes (GI/1, 2, 4, 5, 8, 9, 11, 12 and 14) and 13 GII genotypes (GII/1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 15 and 16), showing considerable genetic diversity.
    Conclusions: Based on the partial capsid gene sequences, we identified a great number of NoV strains belonging to many genotypes, demonstrating that genetically diverse NoV strains are co-circulating in aquatic environments and human populations.
    Significance and Impact of the Study: Our results clearly demonstrate the seasonal trend and genetic diversity of NoVs in wastewater.

    DOI: 10.1111/j.1365-2672.2012.05231.x

    Web of Science

    researchmap

  • Complete mineralization of benzene by a methanogenic enrichment culture and effect of putative metabolites on the degradation. Reviewed

    Masumoto H, Kurisu F, Kasuga I, Tourlousse DM, Furumai H

    Chemosphere   86 ( 8 )   822 - 828   2012.2

  • 低炭素型住宅へ向けた雨水利用の可能性-住宅における用途別雨水利用を目的とした屋根排水の水質評価- Reviewed

    村上道夫, 稲葉愛美, 原本英司, 韋希聞, 中村高志, 屋井裕幸, 片山浩之, 古米弘明, 中谷隼, 佐野翔一

    住総研研究論文集   38   235 - 244   2012

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    researchmap

  • Contributions of Road Surface Deposits and Atmospheric Deposition to Heavy-Metal and Nitrogen Contamination by Road Runoff in a Residential Area

    KOJIMA Keisuke, SANO Shoichi, FURUMAI Hiroaki

    Japan journal of water pollution research   35 ( 8 )   119 - 126   2012

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    Road runoff collected in a residential area in Tokyo was analyzed to determine the concentration level and their forms of heavy metals (i.e., Ni, Cu, Zn, and Pb) and inorganic nitrogen (i.e., NO2-N, NO3-N, and NH4-N). In comparison with previous literature values on highway runoff, the Ni, Cu, and Pb concentrations were to be low owing to the difference in traffic volume. However, the Zn and NO3-N concentrations were the same as the previously reported values. In the road runoff, particulate fraction was dominant to the dissolved fraction for Ni and Pb, whereas the dissolved fraction was comparable to the particulate fraction for Cu and Zn. Nitrate in road runoff was the most dominant among the various forms of inorganic nitrogen, which accounted for 80±11% of total inorganic nitrogen. Moreover, the contributions of road surface deposits and atmospheric deposition to the heavy-metal and nitrogen load in road runoff were estimated. The results showed that a larger antecedent dry period gave a larger contribution of atmospheric deposition to the heavy-metal and nitrogen load in road runoff. The contribution of road surface deposit to heavy-metal load was larger than that to nitrogen load.

    DOI: 10.2965/jswe.35.119

    researchmap

  • Runoff load estimation of particulate and dissolved nitrogen in Lake Inba watershed using continuous monitoring data on turbidity and electric conductivity Reviewed

    J. Kim, Y. Nagano, H. Furumai

    WATER SCIENCE AND TECHNOLOGY   66 ( 5 )   1015 - 1021   2012

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IWA PUBLISHING  

    Easy-to-measure surrogate parameters for water quality indicators are needed for real time monitoring as well as for generating data for model calibration and validation. In this study, a novel linear regression model for estimating total nitrogen (TN) based on two surrogate parameters is proposed based on evaluation of pollutant loads flowing into a eutrophic lake. Based on their runoff characteristics during wet weather, electric conductivity (EC) and turbidity were selected as surrogates for particulate nitrogen (PN) and dissolved nitrogen (DN), respectively. Strong linear relationships were established between PN and turbidity and DN and EC, and both models subsequently combined for estimation of TN. This model was evaluated by comparison of estimated and observed TN runoff loads during rainfall events. This analysis showed that turbidity and EC are viable surrogates for PN and DN, respectively, and that the linear regression model for TN concentration was successful in estimating TN runoff loads during rainfall events and also under dry weather conditions.

    DOI: 10.2166/wst.2012.275

    Web of Science

    researchmap

  • Shotgun isotope array for rapid, substrate-specific detection of microorganisms in a microbial community. Reviewed

    Tobino T, Kurisu F, Kasuga I, Furumai H

    Applied and environmental microbiology   77 ( 20 )   7430 - 7432   2011.10

  • Validation of internal controls for extraction and amplification of nucleic acids from enteric viruses in water samples

    Akihiko Hata, Hiroyuki Katayama, Masaaki Kitajima, Chettiyappan Visvanathan, Chea Nol, Hiroaki Furumai

    Applied and Environmental Microbiology   77 ( 13 )   4336 - 4343   2011.7

     More details

    Publishing type:Research paper (scientific journal)  

    Inhibitors that reduce viral nucleic acid extraction efficiency and interfere with cDNA synthesis and/or polymerase activity affect the molecular detection of viruses in aquatic environments. To overcome these significant problems, we developed a methodology for assessing nucleic acid yields and DNA amplification efficiencies for environmental water samples. This involved adding particles of adenovirus type 5 and murine norovirus and newly developed primer-sharing controls, which are amplified with the same primer pairs and result in the same amplicon sizes as the targets, to these samples. We found that nucleic acid loss during the extraction process, rather than reverse transcription-PCR (RT-PCR) inhibition, more significantly attributed to underestimation of the presence of viral genomes in the environmental water samples tested in this study. Our success rate for satisfactorily amplifying viral RNAs and DNAs by RT-PCR was higher than that for obtaining adequate nucleic acid preparations. We found that inhibitory properties were greatest when we used larger sample volumes. A magnetic silica bead-based RNA extraction method effectively removed inhibitors that interfere with viral nucleic acid extraction and RT-PCR. To our knowledge, this is the first study to assess the inhibitory properties of environmental water samples by using both control virus particles and primersharing controls. © 2011, American Society for Microbiology.

    DOI: 10.1128/AEM.00077-11

    Scopus

    PubMed

    researchmap

  • The influence of field-oriented environmental education on leadership development Reviewed

    Kyoungjin An, Tomohiro Akiyama, Jinyoung Kim, Tomomi Hoshiko, Hiroaki Furumai

    3RD WORLD CONFERENCE ON EDUCATIONAL SCIENCES (2011)   15   1271 - 1275   2011

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:ELSEVIER SCIENCE BV  

    This paper reviews the outcome of field exercise 'Oasis unit' under a new postgraduate educational initiative named "Asian Program for Incubation of Environmental Leaders" (APIEL). The Oasis unit was conducted in the Heihe River basin located in the arid northwest part of China. The influence of field-oriented environmental leadership education on the development of environmental leaders was examined throughout the program. The questionnaire including leadership skills, style, and education was used to carry out a survey administered to two groups divided on the basis of field oriented educational experience. The survey compared the results of both group to evaluate how field-oriented education influenced leadership development. (C) 2011 Published by Elsevier Ltd.

    DOI: 10.1016/j.sbspro.2011.03.275

    Web of Science

    Scopus

    researchmap

  • Comparison of Assimilable organic carbon removal and Bacterial community structures in Biological activated carbon process for advanced drinking water treatment plants

    Suwat Soonglerdsongpha, Ikuro Kasuga, Futoshi Kurisu, Hiroaki Furumai

    Sustainable Environment Research   21 ( 1 )   59 - 64   2011

     More details

    Publishing type:Research paper (scientific journal)  

    © 2011, Chinese Institute of Environmental Engineering. All rights reserved. This study was to compare the removal efficiency of assimilable organic carbon (AOC) by biological activated carbon (BAC) filtration in three advanced drinking water treatment plants in Japan. The influence of total microbial abundances and bacterial community associated with BAC on AOC removal was also investigated. Results showed that AOC concentrations were increased after ozonation treatment. BAC filtration offered high removal efficiency of AOC from 53 to 73%. The highest reduction was observed in plant A. Total microorganisms on BAC in plant A, B and C enumerated by 4',6-diamidino-2-phenylindole staining method were 4.4 × 108, 9.0 × 108 and 5.1 × 108 cells g-1 wet, respectively. Cell-specific activity of AOC removal in BAC treatment followed the order of plant A, plant C and plant B. The bacterial community structures of raw water and BAC samples were investigated by polymerase chain reaction- denaturing gradient gel electrophoresis and Terminal Restriction Fragment Length Polymorphism.Bacterial communities in raw water of all three plants were similar but significantly different from those on BAC. This suggests that community structure changes along the treatment process. Bacterial community on BAC of plant A was slightly different from those on BAC of plant B and C. The difference in service time or retention time of BAC filtration might have some influence on bacterial community structures.

    Scopus

    researchmap

  • Toxicity evaluation of road dust in the runoff process using a benthic ostracod Heterocypris incongruens Reviewed

    Haruna Watanabe, Fumiyuki Nakajima, Ikuro Kasuga, Hiroaki Furumai

    Science of the Total Environment   409   2366 - 2372   2011

     More details

    Language:English  

    Road dust is considered an important source of sediment contamination; however, there are few studies on the toxicity of road dust on benthic organisms. This study evaluates the toxicity of road dust on the benthic ostracod, Heterocypris incongruens, through a 6-day direct exposure experiment. All six road dust samples collected in heavy traffic areas caused high mortality of the ostracod, whereas the road dust collected in a residential area did not show toxicity to the ostracod. After maintaining the mixture of road dust and water for 24 h, the toxicity of the road dust decreased significantly for three of the six samples in the heavy traffic areas, suggesting these road dust samples become less toxic in the surface runoff process. In addition, we conducted the same toxicity test on manipulated road dust using different solid/liquid ratios and holding times to evaluate the change in toxicity caused by the runoff process. Wet road dust that had been separated from a dust-water mixture after a holding time of 1 h or 24 h did not show lethal toxicity, while the water-soluble fraction of the mixture caused high mortality of the ostracod at a solid/liquid ratio of 1:2 and 1:4. However, after a 7-day holding time of the dust-water mixture, the wet road dust and the water-soluble fraction showed lethal toxicity to the ostracod. These results suggest that toxicants of road dust seemed to exist mainly in water soluble fraction eluted off by rain water; however, particle-bound fraction again showed lethal toxicity after 7 days of incubation.

    DOI: 10.1016/j.scitotenv.2011.03.001

    researchmap

  • Evaluation of surface runoff and road dust as sources of nitrogen using nitrate isotopic composition Reviewed

    K. Kojima, M. Murakami, C. Yoshimizu, I. Tayasu, T. Nagata, H. Furumai

    Chemosphere   84 ( 11 )   1716 - 1722   2011

  • Concentration-dependent response of estrone-degrading bacterial community in activated sludge analyzed by microautoradiography-fluorescence in situ hybridization. Reviewed

    Thayanukul P, Zang K, Janhom T, Kurisu F, Kasuga I, Furumai H

    Water research   44 ( 17 )   4878 - 4887   2010.9

  • Predominance of ammonia-oxidizing archaea on granular activated carbon used in a full-scale advanced drinking water treatment plant. Reviewed

    Kasuga I, Nakagaki H, Kurisu F, Furumai H

    Water research   44 ( 17 )   5039 - 5049   2010.9

  • Practical indentification method for vegetation in urban region using two spectral edge in high resolution satellite imagery Reviewed

    Jinyoung KIM, Hiroaki FURUMAI, Toshiya ARAMAKI

    土木学会論文集G   66 ( 1 )   46 - 55   2010.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.2208/jscejg.66.46

    J-GLOBAL

    researchmap

  • Urban Nonpoint Source Pollution Focusing on Micropollutants and Pathogens Reviewed

    H. Furumai, F. Nakajima, H. Katayama

    Treatise on Water Science   4   265 - 276   2010.1

     More details

    Language:English   Publishing type:Part of collection (book)   Publisher:Elsevier  

    DOI: 10.1016/B978-0-444-53199-5.00088-9

    Scopus

    researchmap

  • Heavy Metals Speciation of Size-fractionated Sediments Collected from Combined Sewer System Using Sequential Extraction Method Reviewed

    K. Kojima, I. Kasuga, F. Kurisu, H. Furumai

    Water Practice and Technology   5 ( 3 )   2010

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.2166/wpt.2010.057

    researchmap

  • Evaluation of Community-owned Water Resources Based on Water Quality Labeling System Reviewed

    Hiroaki Furumai, Michio Murakami, Tushara G. G. Chaminda

    WATER INFRASTRUCTURE FOR SUSTAINABLE COMMUNITIES: CHINA AND THE WORLD   89 - 116   2010

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IWA PUBLISHING  

    Global freshwater resources are in growing demand, owing to rapid urbanization and climate change. This is particularly evident in Asian developing countries. As a result, the use of alternative water resources, such as rainwater and reclaimed water, are being considered. However, due to concerns regarding water quality, the general public is still hesitant to use these alternative resources. It is important, therefore, to develop evaluation methodologies which overcome public uncertainties over the use of community-owned water resources. This paper examines the use of water quality evaluation methodologies in Japan. The proposed method of water quality evaluation is the water quality labeling system&apos;. This method provides a good representation of the water quality in different resources. Another method used is the evaluation of CO(2) emissions through water production which provides a clear comparison between existing water supply systems and community-owned water resources. By adopting these evaluation methodologies, the public can understand the benefits and risks of using alternative water resources.

    Web of Science

    researchmap

  • Abundance and diversity of ammonia-oxidizing archaea and bacteria on biological activated carbon in a pilot-scale drinking water treatment plant with different treatment processes. Reviewed

    Kasuga I, Nakagaki H, Kurisu F, Furumai H

    Water science and technology : a journal of the International Association on Water Pollution Research   61 ( 12 )   3070 - 3077   2010

  • 都市雨水および雨天時排水中の水質と雨水利用の新たな展開

    村上道夫, 古米弘明

    用水と廃水   52 ( 4 )   288 - 296   2010

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    researchmap

  • Washoff behavior of in-sewer deposit in combined sewer system through artificial flushing experiment Reviewed

    Weon Jae Kim, Satoshi Managaki, Hiroaki Furumai, Fumiyuki Nakajima

    Water Science and Technology   61 ( 11 )   2835 - 2842   2010

     More details

    Language:English  

    In-sewer deposits in combined sewer systems (CSSs) are closely related with the behavior of first foul flush and combined sewer overflows. However, the research paying attention to the role of in-sewer deposits is quite rare, furthermore, their contributions for the washoff patterns of each pollutant including pathogenic microorganisms are almost never discussed so far. The artificial flushing experiment separating the washoff of in-sewer deposits from the inflow of surface pollutants was carried out to simulate the first foul flush in a CSS. The washoff behaviors of each pollutant including bacterial indicators and enteric viruses were investigated. Several morphological analyses for the concentration and load curves of each parameter were conducted and all patterns were classified according to their washoff characteristics and first foul flush patterns. The washoff behaviors of each pollutant and microorganism are different from each other and categorized into several groups according to their (i) time-series concentration and load curves and (ii) concentration vs. flow rate curves, respectively. The first foul flush patterns of each parameter were to be categorized into typical 3 groups; strong-, partial-, and no first foul flush group. The order of these groups signifies the strength of the first foul flush phenomena and the runoff priority as well.

    DOI: 10.2166/wst.2010.097

    researchmap

  • Comparison of metal (Zn and Cu) complexation characteristics of DOM in urban runoff, domestic wastewater and secondary effluent Reviewed

    G.G Tushara Chaminda, Fumiyuki Nakajima, Hiroaki Furumai, Ikuro Kasuga, Futoshi Kurisu

    Water Science and Technology   62 ( 9 )   2044 - 2050   2010

     More details

    Language:English  

    This study was aimed at comparing the Zn and Cu binding parameters with dissolved organic matter (DOM) in road runoff, wastewater treatment plant (WWTP) effluent and influent. Conditional stability constant (K&#039;) and binding site concentration ([L]) are important to predict free or labile metal concentration and toxicity in the water environment. The values of K&#039; and [L] of three DOMs were determined by metal titration and Scatchard linearization. The Zn and Cu titration data for DOMs in WWTP effluent and influent fitted to a two-ligand model, while DOM in road runoff fitted to a single-ligand model. The order of the values of K&#039; was WWTP influent &gt; WWTP effluent &gt; road runoff both for Zn and Cu. Total ambient binding site concentration ([L(T)]) was lower in DOM of road runoff (1.4-1.5 μM) than those in DOM of WWTP effluent (1.6-2.3 μM) and influent (17-18 μM), suggesting lower metal complexation capacity in DOM of road runoff. DOM in WWTP influent was expected to bind to both Zn and Cu more strongly than that of the effluent DOM.

    DOI: 10.2166/wst.2010.517

    researchmap

  • Water Pollution Characterization by Pathogenic Indicators in Water Runoff in the Downtown of Hanoi, Vietnam

    QUAN Pham Van, FURUMAI Hiroaki, KURISU Futoshi, KASUGA Ikuro, HA Cao The, CHIEU Le Van

    Journal of Water and Environment Technology   8 ( 3 )   259 - 268   2010

     More details

    Language:English   Publisher:Japan Society on Water Environment  

    In Hanoi, the capital of Vietnam, lakes and rivers are polluted by both point pollution sources such as discharge from sewerage system; and by non-point pollution sources such as washoff from land surface and leakage from septic tanks. Several studies had mentioned about water pollution but were mainly focusing on organic pollution, feacal contamination and pollutant sources from surface runoff were not considered. To investigate the characteristics of pollutant variation in runoff water and feacal contamination by pathogenic indicators, water samples were collected in August and September 2008, by the roadside and at the inflows of lakes under wet weather condition in the downtown of Hanoi. Monitoring results showed high pollutant concentration, especially pathogenic indicators as E.coli and total coliform (TC), both in road runoff and water that flowed into lakes. Runoff water quality was much different depending on the sampling locations and patterns of rainfall. Pollutant concentration collected by the roadside tend to increase at the end of rainfall. It might be attributed to the discharge of domestic wastewater from individual households or leakage from septic systems. Time and spatial variation were much different for each event that made urban runoff water to be more difficult to control in comparison with domestic wastewater. Cluster analysis was applied to find the similarities of water quality among sampling locations. It was a useful method to find the spatial variation of pollutants and their level of pollution.

    DOI: 10.2965/jwet.2010.259

    researchmap

  • 下水処理水および道路排水の土壌浸透処理による水質変化とそのリスク評価 Reviewed

    古米弘明, 村上道夫, 中田典秀, 高田秀重

    土壌の物理性   111   17 - 24   2009

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    researchmap

  • 有効降雨を考慮したシステム同定手法によるオンライン線形流量予測モデルの精度向上 Reviewed

    長岩明弘, 古米弘明, 中島典之, 斗成聡一

    下水道協会誌   46 ( 556 )   95 - 106   2009

     More details

    Language:Japanese  

    researchmap

  • 都市内自己水源の有効活用に向けた水資源配置に関する基礎的検討、-活動特性の異なる複数の地区を対象として- Reviewed

    氏原岳人, 毛利紫乃, 小野芳朗, 古米弘明, 谷口, 守

    環境システム研究論文集   35   207-218   2007.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    researchmap

  • Estimation of potential water resources in mega-cities in Asia

    Komura Takuya, Moroizumi Toshitsugu, Okubo Kenji, Ono Yoshiro, Taniguchi Mamoru, Furumai Hiroaki

    Proceeding of Annual Conference   20   24 - 24   2007

     More details

    Language:Japanese   Publisher:THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

    In this study, we calculated actual evapotranspiration using a simple method with metrological data, and estimated the potential water resources of mega cities in Asia. The potential evapotranspiration was overestimated using a Hamon's equation, compared with that of a Penman's; therefore, the evapotranspiration by the Hamon's were corrected using the regression line. The amounts of the potential water resources of mega cities in Asia were large. The pre capita amounts, however,were not so much. The population of city and the district of city area affect the estimation of water balance. It is useful for the use of water resources to estimate the water balances of mega cities in Asia with the simple method in this study.

    DOI: 10.11520/jshwr.20.0.24.0

    researchmap

  • Three dimensional fluorescent spectroscopy analysis for the evaluation of organic matter removal from industrial estate wastewater by stabilization ponds Reviewed

    C. Musikavong, S. Wattanachira, F. Nakajima, H. Furumai

    Water Science & Technology   155 ( 11 )   201 - 210   2007

     More details

    Language:English  

    The fluorescent excitation emission matrix (FEEM) was utilized to evaluate the removal of organic matter by stabilization ponds, which consist of aeration, facultative, and oxidation ponds of a central wastewater treatment plant of an industrial estate in northern Thailand. The result shows that six fluorescent peaks of influent wastewater and effluent water after aeration, facultative, and oxidation ponds were detected from the FEEMs at 230?nmEx/295?nmEm (A), 275?nmEx/300?nmEm (B), 240?nmEx/355?nmEm (C), 280?nmEx/355?nmEm (D), 275?nmEx/410?nmEm (E) and 330?nmEx/410?nmEm (F). The putative origins of peaks A and B, C and D, and E and F were tyrosine-like, tryptophan-like, and humic and fulvic acid-like substances, respectively. The aeration pond was the main course of action used to reduce the tyrosine-like substances at peaks A and B by 88 and 52%, respectively, and tryptophan-like substances at peaks C and D by 43 and 39%, respectively. There was only a 20 per cent decrease of humic and fulvic acid-like substances at peak E and an 18 per cent decrease at peak F through the use of aeration ponds. Total per cent reductions of total fluorescent organic matter after aeration ponds; facultative ponds; and oxidation ponds were 46, 51 and 54%, respectively. These values were notably similar to the total percent reduction of DOC by the same respective processes at 54, 53, and 55%.

    DOI: 10.2166/wst.2007.361

    researchmap

  • 韓国始華湖における堆積問題の現状

    小野 澤恵一, 鯉渕 幸生, 古米 弘明, 呉 海鍾, 佐藤 愼司

    海岸工学論文集   53   926 - 930   2006

     More details

    Language:Japanese   Publisher:公益社団法人 土木学会  

    始華湖は1994年12.7kmの潮受堤防竣工によって完成した人工湖である. 締切後の著しい水質悪化に伴い1997年には淡水化を断念し, 排水門による海水交換を開始したものの, 未だ水質が回復したとは言えないのが現状である. さらに周辺の工場廃水に含まれる重金属などが土砂に吸着し, 湖内に堆積する過程を通じて, 水質のみならず底質環境にも悪影響が及んでいることが懸念されている. 本研究では, 現地採取コアの重金属分析や安定同位体分析, および土砂輸送の数値解析を通して, 始華湖における堆積環境の変遷について考察する. さらに現在建設中の潮力発電施設が, 海水交換や土砂堆積へ及ぼす影響についても評価した.

    DOI: 10.2208/proce1989.53.926

    CiNii Research

    researchmap

  • 都市河川における下水処理水の流入が粒状有機物の動態及び底生動物群集構造に及ぼす影響

    細見 暁彦, 古米 弘明, 吉村 千洋, 中島 典之, 加賀谷 隆, 春日 郁朗

    日本陸水学会 講演要旨集   71   28 - 28   2006

     More details

    Language:Japanese   Publisher:日本陸水学会  

    DOI: 10.14903/jslim.71.0.28.0

    researchmap

  • Effects of rainfall on the occurrence of human adenoviruses, total coliforms, and Escherichia coli in seawater. Reviewed

    Haramoto, E, H. Katayama, K. Oguma, Y. Koibuchi, H. Furumai, S. Ohgaki

    Water Science & Technology   54 ( 3 )   225 - 230   2006

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    researchmap

  • Formation and accumulation of extra-cellular polymers by hydrogen utilizing anaerobes.

    JIA Xiao Shan, FURUMAI Hiroaki, KUSUDA Tetsuya

    Doboku Gakkai Ronbunshuu G   29   225 - 233   1992

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    The purposes of this study are to investigate the formation and accumulation of extra-cellular polymers (ECP) by hydrogen utilizing anaerobes under high hydrogen partial pressure conditions, which are found at bottom parts of UASB reactors. Two types of enrichment culture were obtained in which hydrogen gas was intermittently replenished as a substrate with and without sulfates. One of them is an enrichment culture of hydrogen utilizing methanogen (HUM) and the other is a mixed culture of HUM and hydrogen utilizing sulfate reducing bacteria (SRB). Effects of ammonium nitrogen and cysteine on ECP formation were investigated for each culture. A remarkable accumulation of ECP by HUM was observed at the beginning of a batch experiment. in which hydrogen gas and ammonium nitrogen were sufficiently added without cysteine. However, ECPs were not significantly accumulated in the other cases for the HUM culture and all the cases for SRB. Chemical analysis of the produced ECP suggests that ECP protein was more dominant than ECP carbohydrate. HUMs played a role in producing ECP under such a special condition as well as acid producing bacteria. The experimental results suggest that ECP formation from HUM might contribute to self-granulation of sludge in UASB reactors at the bottom where high hydrogen partial pressure was established. There is also a possibility that SRB had a negative effect on sludge granulation by suppressing ECP accumulation.

    DOI: 10.11532/proes1992.29.225

    researchmap

  • FRACTIONAL COMPOSITION OF PHOSPHORUS FORMS IN SEDIMENTS RELATED TO RELEASE - DISCUSSION Reviewed

    E ARVIN, H BERNHARDT, DE SIMPSON, H FURUMAI, S OHGAKI

    WATER SCIENCE AND TECHNOLOGY   14 ( 8 )   908 - 911   1982

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Web of Science

    researchmap

▼display all

Books

  • cSUR-UT Series, Library for Sustainable Urban Regeneration Volume 6, [11. Collaborative Development of Water Environment Quality Index in Japan, pp.165-179] Hiroaki Furumai, Futaba Kazama, Hiroshi Nagaka and Jun Nakajima

    Springer  2009 

     More details

  • 日本の水環境行政 改訂版 編集 (社)日本水環境学会 編集代表

    ㈱ぎょうせい  2009 

     More details

  • Chapter 1 Introduction in "Urban Water in Japan" edited by Rutger de Graaf/ Fransfe Hooimeijer, pp1-16 Frans van de VEN, Hiroaki FURUMAI, Kenichi KOGA

    Taylor and Rancis  2008 

     More details

  • cSUR-UT Series, Library for Sustainable Urban Regeneration Volume 1, Urban Environment Management and Technology [2.Urban Water Use and Multifunctional Sewerage Systems as Urban Infrastructure, pp.29-46.]

    Springer  2008 

     More details

  • 2.Urban Water Use and Multifunctional Sewerage Systems as Urban Infrastructure,pp.29-46(分担執筆)

    「Urban Environmental Management and Technology」Springer  2008 

     More details

  • 14. Reclaimed stormwater and wastewater and factors affectiong their reuse,pp218-235(分担執筆)

    「Cities of the Future, Towards integrated sustainable water and landscape management」IWA Publishing  2007 

     More details

  • 河川の水質と生態系 新しい河川環境創出に向けて 古米弘明(分担執筆)

    技報堂出版  2007 

     More details

  • 自然・社会と対話する環境工学

    環境工学委員会 編集  2007 

     More details

  • 5章 粒状有機物の動態と水生生物との相互関係

    「河川の水質と生態系-新しい河川環境創出に向けて-」技報堂出版  2007 

     More details

  • 1.3.3粒状有機物(POM),pp26-pp33

    「河川の水質と生態系-新しい河川環境創出に向けて-」技報堂出版  2007 

     More details

  • Southeast Asian Water Environment 2 Furumai H, Katayama H, Kurisu F, Satoh H, Ohgaki S and Thanh NC

    IWA Publishing  2007 

     More details

  • これからの大学等研究施設 第3編「環境科学編」 (4.3.1 水環境, pp.59-64)

    文教施設協会・科学新聞社  2006 

     More details

  • Ⅰ.場 概説,pp1-2(分担執筆)

    「水環境ハンドブック」(社)日本水環境学会  2006 

     More details

  • 3 欧州の栄養塩類汚染の動向と欧米の将来対策、pp.71-106(分担執筆)

    「河川と栄養塩類 管理に向けての提言」技報堂出版  2005 

     More details

  • 分散型サニテーションと資源循環 ―概念、システムそして実践―(翻訳分担)

    技報堂  2005 

     More details

  • 4.4 河川水における窒素、リン管理の必要性,pp.152-161

    「河川と栄養塩類 管理に向けての提言」技報堂出版  2005 

     More details

  • 下水道にかかわる都市計画の基本的な考え方

    「新・都市計画マニュアルⅡ第7巻[都市施設・公園緑地編]供給処理施設・河川」丸善、日本都市計画学会編  2003 

     More details

  • 諸外国の水質環境管理

    「流域マネジメント 新しい戦略のために」技報堂出版、大垣眞一郎・吉川秀夫監修  2002 

     More details

  • Modified models of wash-off from roofs and roads for non-point pollution analysis during first flush phenomena (In : Urban Drainage Modeling - Proceedings of the Specialty Symposium of the World Water and Environmental Resources Congress, pp.275-286) Y・・・

    American Society of Civil Engineers  2001 

     More details

    Modified models of wash-off from roofs and roads for non-point pollution analysis during first flush phenomena (In : Urban Drainage Modeling - Proceedings of the Specialty Symposium of the World Water and Environmental Resources Congress, pp.275-286) Yasuaki Hijioka, Fumiyuki Nakajima, Hiroaki Furumai

    researchmap

  • Modeling and field survey on wash-off behavior of suspended particles from roofs and roads (In : Urban Drainage Modeling - Proceedings of the Specialty Symposium of the World Water and Environmental Resources Congress, pp.225-237) Hiroaki Furumai, Yasu・・・

    American Society of Civil Engineers  2001 

     More details

    Modeling and field survey on wash-off behavior of suspended particles from roofs and roads (In : Urban Drainage Modeling - Proceedings of the Specialty Symposium of the World Water and Environmental Resources Congress, pp.225-237) Hiroaki Furumai, Yasuaki Hijioka, Fumiyuki Nakajima

    researchmap

  • Quinone profile analysis of activated sludge in enhanced biological P removal SBR treating actual sewage(共著)

    Advances in Water and Wastewater Treatment Technology, Elsevier  2001 

     More details

  • Water Pollution Control Policy and Management(共著)

    ぎょうせい  2000 

     More details

  • 3.1 環境基準の基準としての特徴、pp24-25

    「日本の水環境行政」、ぎょうせい、(社)日本水環境学会 編集  1999 

     More details

  • 河川生態系の保全と管理(単著)

    環境保全・創出のための生態工学 丸善株式会社  1999 

     More details

  • 3.3 水質環境基準(生活環境項目)、p33-42

    「日本の水環境行政」、ぎょうせい、(社)日本水環境学会 編集  1999 

     More details

  • 20.4 水域の富栄養化と微量汚染p1038-1046(分担執筆)

    「下水道ハンドブック」最新下水道ハンドブック編集委員会編,建設産業調査会  1997 

     More details

  • Wastewater Engineering ; Treatment, Disposal and Reuse

    1993 

     More details

  • 水質環境工学 -下水の処理・処分・再利用(翻訳分担)

    技報堂  1993 

     More details

  • 河川感潮部における硝化活性(単著)

    「環境微生物工学研究法」技報堂、土木学会衛生工学委員会編  1993 

     More details

  • 嫌気性混合培養系におけるメタン生成菌の活性量(単著)

    「環境微生物工学研究法」技報堂、土木学会衛生工学委員会編  1993 

     More details

▼display all

MISC

  • The fate and risk of nontuberculous mycobacteria in the water supply system: a review

    Yalan Gan, Iftita Rahmatika, Futoshi Kurisu, Hiroaki Furumai, Dai Simazaki, Hanako Fukano, Yoshihiko Hoshino, Ikuro Kasuga

    H2Open Journal   5 ( 2 )   180 - 197   2022

     More details

    Publishing type:Book review, literature introduction, etc.  

    Nontuberculous mycobacteria (NTM) infection is estimated as the most serious waterborne infectious disease. NTM are ubiquitous in drinking water supply systems, which could be one of the possible exposure pathways for NTM disease, posing a serious concern to human health. Characteristics of NTM, such as exposure via inhalation, disinfectant resistance, survival in oligotrophic conditions, and association with amoebae, are largely different from those of Escherichia coli (E. coli) which has been traditionally regarded as a model bacterium causing gastrointestinal diseases in water safety. However, the fate of NTM in water supply systems from source water to the point of use has not been systematically revealed yet. Thus, this review proposes that NTM should be regarded as alternative model bacteria in water use by updating the current knowledge on the occurrence, removal efficiency, and regrowth of NTM in water supply systems. Moreover, we demonstrate the need to establish a comprehensive quantitative microbial risk assessment to identify the critical control point, which is indispensable to mitigate NTM risk in water use.

    DOI: 10.2166/h2oj.2022.144

    Scopus

    researchmap

  • Exploration of Biodegradable Organic Matter in Tap Water Using High Resolution Mass Spectrometry

    新福優太, 栗栖太, 春日郁朗, 高梨啓和, 古米弘明

    日本水環境学会年会講演集   56th   2022

  • Prediction of Urban Non-point Pollution Load by Statistical Analysis of Data of Published Research and Its Reliability Evaluation -Statistical Analysis of Mean Load and Verification and Modification of Previously Proposed Model Using Newly Obtained Data-

    尾崎則篤, 和田桂子, 村上道夫, 中島典之, 古米弘明

    水環境学会誌(Web)   44 ( 1 )   2021

  • Urban rainwater harvesting systems: Research, implementation and future perspectives (vol 115, pg 195, 2017)

    Alberto Campisano, David Butler, Sarah Ward, Matthew J. Burns, Eran Friedler, Kathy DeBusk, Lloyd N. Fisher-Jeffes, Enedir Ghisi, Ataur Rahman, Hiroaki Furumai, Mooyoung Han

    WATER RESEARCH   121   386 - 386   2017.9

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    DOI: 10.1016/j.watres.2017.06.002

    Web of Science

    researchmap

  • Urban rainwater harvesting systems: Research, implementation and future perspectives

    Alberto Campisano, David Butler, Sarah Ward, Matthew J. Burns, Eran Friedler, Kathy DeBusk, Lloyd N. Fisher-Jeffes, Enedir Ghisi, Ataur Rahman, Hiroaki Furumai, Mooyoung Han

    WATER RESEARCH   115   195 - 209   2017.5

     More details

    Language:English   Publishing type:Book review, literature introduction, etc.   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    While the practice of rainwater harvesting (RWH) can be traced back millennia, the degree of its modern implementation varies greatly across the world, often with systems that do not maximize potential benefits. With a global focus, the pertinent practical, theoretical and social aspects of RWH are reviewed in order to ascertain the state of the art. Avenues for future research are also identified. A major finding is that the degree of RWH systems implementation and the technology selection are strongly influenced by economic constraints and local regulations. Moreover, despite design protocols having been set up in many countries, recommendations are still often organized only with the objective of conserving water without considering other potential benefits associated with the multiple-purpose nature of RWH. It is suggested that future work on RWH addresses three priority challenges. Firstly, more empirical data on system operation is needed to allow improved modelling by taking into account multiple objectives of RWH systems. Secondly, maintenance aspects and how they may impact the quality of collected rainwater should be explored in the future as a way to increase confidence on rainwater use. Finally, research should be devoted to the understanding of how institutional and socio-political support can be best targeted to improve system efficacy and community acceptance. (C) 2017 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.watres.2017.02.056

    Web of Science

    researchmap

  • Estimation of source contribution to nitrate loading in road runoff using stable isotope analysis (vol 14, pg 337, 2016)

    K. Kojima, S. Sano, F. Kurisu, H. Furumai

    URBAN WATER JOURNAL   14 ( 4 )   2017

     More details

    Language:English   Publisher:TAYLOR & FRANCIS LTD  

    DOI: 10.1080/1573062X.2016.1163794

    Web of Science

    researchmap

  • Advanced countermeasures for urban inundation: An example case of data integration approach to solve social issues

    渋尾欣弘, 佐貫宏, LEE Sungae, 吉村耕平, 田島芳満, 古米弘明, 佐藤愼司

    情報管理   60 ( 2 )   100‐109(J‐STAGE)   2017

     More details

  • EVALUATION OF REDUCTION OF COMBINED SEWER OVERFLOW LOADS BY MODEL ANALYSIS OF IN-SEWER SEDIMENT BEHAVIOR

    KASUI Naoki, KASUGA Ikuro, KURISU Futoshi, KATAYAMA Hiroyuki, FURUMAI Hiroaki

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)   72 ( 7 )   III_153 - III_160   2016

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    &amp;nbsp;It has been known that in-sewer sediments significantly contribute to combined sewer overflow (CSO) loads. However, knowledge is limited on the behavior of in-sewer sediment. In this study, characteristics of the accumulation and entrainment of in-sewer sediment were analyzed in a drainage area of 42.2 km&lt;sup&gt;2&lt;/sup&gt; using a distributed sewer model based on Ackers &amp; White&#039;s theory on the sediment transport. It was found that there is a large spatial variation in the amount of sediment deposited during dry weather and entrained during wet weather. It indicated that spatial characteristics of sediment accumulation and entrainment should be considered in a sewer network in order to identify the significant sources of the CSO loads. Then the reduction of CSO loads was evaluated by removal of in-sewer sediment by flushing with water. The reduction of CSO loads by water injection for sediment flushing at 3 points was estimated and compared. The results showed that CSO loads were reduced by 18.3 % in the case of 32400 m&lt;sup&gt;3&lt;/sup&gt; of cleaning water. This study demonstrates that model analysis is useful to evaluate the effectiveness of the CSO reduction measure by the removal of in-sewer sediment by flushing with water.

    researchmap

  • Resource recovery: Efficient approaches to sustainable water and wastewater treatment

    Xiaodi Hao, Hiroaki Furumai, Guanghao Chen

    WATER RESEARCH   86   83 - 84   2015.12

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    DOI: 10.1016/j.watres.2015.10.063

    Web of Science

    researchmap

  • EVALUATION OF ORGANIC MATTER UTILIZED FOR MICROBIAL REGROWTH IN RECLAIMED WATER USING ORBITRAP MASS SPECTROMETER

    KURISU Futoshi, KANAYA Kizuku, URAI Makoto, KASUGA Ikuro, FURUMAI Hiroaki

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)   70 ( 7 )   III_185 - III_192   2014

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    &amp;nbsp;Biodegradable organic matter in reclaimed water was evaluated to find strategy to control microbial regrowth. Assimilable organic carbon (AOC) was removed by activated carbon treatment, produced by ozonation, and stable in the other treatment processes. Higher AOC concentration was liable to cause microbial regrowth, and thus the regrowth can be controlled by reducing AOC concentration. Orbitrap mass spectrometer could successfully determine low molecular weight organic matters consumed by microbial regrowth by analyzing samples before and after the regrowth. The fate in the treatment processes was different among the compounds; they were either produced or removed by ozonation, or stable throughout the treatment.

    researchmap

  • P19-12 メタン生成ベンゼン分解集積培養系におけるトルエン,フェノール,安息香酸の分解微生物(ポスター発表)

    野口 愛, 栗栖 太, 春日 郁朗, 古米 弘明

    日本微生物生態学会講演要旨集   2014   192 - 192   2014

     More details

    Language:Japanese   Publisher:日本微生物生態学会  

    CiNii Books

    researchmap

  • P21-15 藻類産生有機物を基点とした湖沼微生物ループに関与する細菌群の季節変化(ポスター発表)

    春日 郁朗, 木戸 佑樹, 栗栖 太, 古米 弘明

    日本微生物生態学会講演要旨集   2014   2014

     More details

    Language:Japanese   Publisher:日本微生物生態学会  

    researchmap

  • 残留塩素を除去した水道水中における微生物の再増殖と基質利用性の評価

    中村仁美, 春日郁朗, 栗栖太, 古米弘明, 島崎大, 秋葉道宏

    全国会議(水道研究発表会)講演集   2014   2014

  • Transition and Future of Comprehensive Index for Water Environmental Evaluation

    36 ( 12 )   439 - 445   2013.12

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • OE-006 土壌・底泥を起源とする5種のメタン生成ベンゼン分解集積培養系における微生物群集構造の比較(微生物群集構造,口頭発表)

    野口 愛, 栗栖 太, 春日 郁朗, 古米 弘明

    日本微生物生態学会講演要旨集   ( 29 )   2013

     More details

    Language:Japanese   Publisher:日本微生物生態学会  

    researchmap

  • OC-001 高度浄水処理生物活性炭に付着するアンモニア酸化微生物の増殖競合の評価(廃水処理生態系,口頭発表)

    春日 郁朗, 牛 佳, 栗栖 太, 古米 弘明, 市川 博明

    日本微生物生態学会講演要旨集   ( 29 )   2013

     More details

    Language:Japanese   Publisher:日本微生物生態学会  

    researchmap

  • OG-001 水道水中の細菌再増殖に与える水温および残留塩素の影響評価(生理・代謝・増殖,口頭発表)

    大坂 幸弘, 古米 弘明, 栗栖 太, 春日 郁朗

    日本微生物生態学会講演要旨集   ( 29 )   2013

     More details

    Language:Japanese   Publisher:日本微生物生態学会  

    researchmap

  • 市街地からの流出負荷量の実態と検討課題

    古米弘明, 尾崎則篤, 中島典之, 和田桂子, 村上道夫

    日本水環境学会シンポジウム講演集   15th   58 - 59   2012.9

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 給水栓における滞留に伴う水質変化と細菌再増殖との関係

    大坂幸弘, 春日郁朗, 栗栖太, 古米弘明

    全国水道研究発表会講演集   63rd   512 - 513   2012.4

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • Soundness of Water Environment and Biodiversity

    FURUMAI Hiroaki

    35 ( 4 )   103 - 103   2012.4

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • Estimate of the concentration of radioactive substances in the river water by a simplified analysis model

    YOSHIMOTO Kentaro, YAGAMI Takuya, ARAKI Kazuhiro, HUJIWARA Naoki, KONOSHIMA Takehiko, WATANABE Akito, ISIKAWA Yoshihiro, HURUMAI Hiroaki

    81 ( 4 )   28 - 38   2012.4

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • タイの大規模洪水における糞便由来汚染

    本多了, 飛野智宏, TUSHARA Chaminda, 渡部徹, 真砂佳史, 大村達夫, 片山浩之, CHIEMCHAISRI Chart, 福士謙介, 古米弘明

    日本水環境学会年会講演集   46th   183   2012.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 河川底泥由来メタン生成集積系におけるベンゼン分解微生物の安定同位体プローブ法による検出

    野口愛, 栗栖太, 春日郁朗, 古米弘明

    日本水環境学会年会講演集   46th   191   2012.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • フーリエ変換質量分析計を用いた下水処理工程水中溶存有機物の網羅的解析

    中許寛之, 栗栖太, 春日郁朗, 古米弘明

    日本水環境学会年会講演集   46th   180   2012.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • Quantification of enteric viruses and microbial indicators in Ishinomaki coastal area

    HATA Akihiko, INABA Manami, KATAYAMA Hiroyuki, FURUMAI Hiroaki

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)   68 ( 7 )   III_285 - III_296   2012

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    &nbsp;Waterborne and oyster-borne diseases are great concerns in Ishinomaki coastal area because a wastewater treatment plant was unable to utilize activated sludge process after the tsunami. In this study, we detected several kinds of enteric viruses, which are one of the most probable causes of the infection, and microbial indicators in quantitative manner. Two virus concentration methods, i.e., a novel large volume method and a conventional small volume method, were performed for a comparison purpose. Efficiencies in each of nucleic acid extraction and RT-qPCR were evaluated by internal controls. Aichi viruses and GII- and GIII-F-specific RNA phages were dominantly detected. GI- and GII-noroviruses and sapoviruses, causative agents of viral gastroenteritis, were also found. Viruses and indicators seemed to diffuse from wastewater treatment plant in both horizontal and vertical directions. The large volume virus concentration method gave higher positive ratio than the small volume method. However, the virus detection was more likely to be affected by RT-PCR inhibition. High molecular weight (>10 kDa) organic compounds which absorb 254 nm ultraviolet were assumed to be causes of the inhibition. We demonstrated distributions of pathogenic viruses in Ishinomaki coastal area as well as need for methods to relieve RT-PCR inhibition efficiently.

    DOI: 10.2208/jscejer.68.III_285

    researchmap

  • PC-02 DNA stable isotope probing of glucose and acetate degrading bacteria in activated sludge treating domestic wastewater(PC Watewater microbiology,Poster session)

    Kido Yuki, Kasuga Ikuro, Kurisu Futoshi, Furumai Hiroaki

    日本微生物生態学会講演要旨集   ( 28 )   2012

     More details

    Language:English   Publisher:日本微生物生態学会  

    researchmap

  • Effects of Cultivation Temperature and Type of Organic Acid Addition on Anaerobic Benzene-Degrading Enrichment Culture under Methanogenic Condition

    MASUMOTO Hiroki, KURISU Futoshi, KASUGA Ikuro, FURUMAI Hiroaki

    Journal of Japan Society on Water Environment   35 ( 12 )   197 - 204   2012

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    In this study, we investigated the effects of organic acid addition and cultivation temperature on anaerobic methanogenic benzene-degrading enrichment culture which include &lt;I&gt;Syntrophobacterales&lt;/I&gt; bacterium Hasda-A, a putative benzene degrader, and its relatives. Benzoate, crotonate, fumarate and acetate, added respectively with benzene, retarded benzene degradation in all cases. However, it was implied that the addition of these organic acids may maintain the number of cells of Hasda-A and its relatives. Cultivation temperature was varied at 3&amp;deg;C intervals ranging from 25&amp;deg;C, at which we have succeeded in obtaining an anaerobic benzene degrading culture, to 37&amp;deg;C, the optimum cultivation temperature for mesophilic methanogens. It was shown that cultivation at 31&amp;deg;C or below can maintain benzene degradation rates higher than that at 34&amp;deg;C and above. In all the experiments, the number of 16S rRNA gene copy of Hasda-A and its relatives correlated with benzene degradation.

    researchmap

  • 岩手・青森県境不法投棄現場地下水における嫌気的ベンゼン分解の可能性

    高橋惇太, 栗栖太, 永井宏征, 春日郁朗, 古米弘明

    地下水・土壌汚染とその防止対策に関する研究集会講演集(CD-ROM)   18th   ROMBUNNO.S1-26   2012

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • フーリエ変換質量分析計を用いた下水二次処理水中有機物の分析及び前処理法の検討

    中許寛之, 栗栖太, 春日郁朗, 古米弘明

    環境工学研究フォーラム講演集   48th   223 - 225   2011.11

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 集積培養系によるメタン生成ベンゼン分解及びトリクロロエチレン脱塩素化の同時進行

    高橋惇太, 栗栖太, 古米弘明

    環境工学研究論文集   48   III.241-III.247   2011.11

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 濁度とECの連続観測データを活用した窒素流出負荷量の推定手法による原単位の評価

    KIM Jinyoung, 中島典之, 古米弘明, 上原浩, 湯浅岳史, 荒巻俊也

    日本水環境学会シンポジウム講演集   14th   233 - 234   2011.9

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 都市における雨天時汚濁流出現象に関する研究

    古米 弘明

    水環境学会誌 = Journal of Japan Society on Water Environment   34 ( 8 )   243 - 243   2011.8

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • 生物活性炭における同化性有機炭素除去能とHyphomicrobium近縁細菌付着量との関係

    大坂幸弘, 平賀由利子, 小島啓輔, 春日郁朗, 栗栖太, 古米弘明

    全国水道研究発表会講演集   62nd   202 - 203   2011.4

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 東村山浄水場生物活性炭吸着池におけるアンモニア酸化微生物の定着過程と硝化活性との関係

    春日郁朗, 小島啓輔, 平賀由利子, 栗栖太, 古米弘明, 岩本智江

    全国水道研究発表会講演集   62nd   204 - 205   2011.4

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • ショットガンアイソトープアレイ法を用いて活性汚泥中から基質特異的に探索した微生物の追跡

    飛野智宏, 栗栖太, 春日郁朗, 古米弘明

    日本水環境学会年会講演集   45th   177   2011.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 生物活性炭における低級カルボン酸利用細菌群の安定同位体プロービング法による同定

    春日郁朗, SOONGLERDSONGPHA S, 栗栖太, 古米弘明, 片山浩之

    日本水環境学会年会講演集   45th   382   2011.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 雨天時における道路からの重金属および窒素流出機構と負荷量評価

    佐野翔一, 小島啓輔, 栗栖太, 古米弘明

    日本水環境学会年会講演集   45th   199   2011.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 土壌由来嫌気集積培養系によるベンゼン及びトリクロロエチレンの同時生分解

    高橋惇太, 栗栖太, 古米弘明

    地下水・土壌汚染とその防止対策に関する研究集会講演集(CD-ROM)   17th   ROMBUNNO.S6-12   2011

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 東京都区部における雨水吐きからの合流式下水道雨天時越流量の推定 (第48回下水道研究発表会講演集)

    小島 啓輔, 古米 弘明

    下水道研究発表会講演集   48   353 - 355   2011

     More details

    Language:Japanese   Publisher:日本下水道協会  

    CiNii Books

    researchmap

  • 雨天時越流が想定される降雨群を対象とした有効降雨モデルパラメータの精緻化 (第48回下水道研究発表会講演集)

    小島 啓輔, 古米 弘明

    下水道研究発表会講演集   48   350 - 352   2011

     More details

    Language:Japanese   Publisher:日本下水道協会  

    CiNii Books

    researchmap

  • 下水および河川水中におけるアイチウイルスの挙動の定量的解析

    北島正章, 端昭彦, 原本英司, 片山浩之, 古米弘明

    日本水環境学会年会講演集   45th   2011

  • 降雨により変動する河川水水質因子が腸管系ウイルス遺伝子定量値に及ぼす影響

    端昭彦, 北島正章, 小島啓輔, 佐野翔一, 片山浩之, 春日郁朗, 古米弘明

    日本水環境学会年会講演集   45th   2011

  • Microbial Community in Thermophilic Contact Oxidization Process for the Treatment of Water-Based Metal Working Fluids Wastewater

    FENG XIN, KURISU FUTOSHI, YAGI OSAMI, KASUGA IKURO, FURUMAI HIROAKI

    Japanese journal of water treatment biology   46 ( 4 )   207 - 214   2010.12

     More details

    Language:Japanese  

    DOI: 10.2521/jswtb.46.207

    researchmap

  • ショットガンアイソトープアレイ法で用いるランダムゲノム断片プローブの特異性の検討

    飛野智宏, 栗栖太, 春日郁朗, 古米弘明

    日本微生物生態学会講演要旨集   26th   71   2010.11

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 基質資化微生物の検出に向けたショットガンアイソトープアレイ法の開発

    飛野智宏, 栗栖太, 春日郁朗, 古米弘明

    日本水環境学会シンポジウム講演集   13th   371 - 376   2010.9

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 合流式下水道管渠内堆積物及び雨天時越流水に含まれる重金属の存在形態特性

    小島啓輔, 春日郁朗, 栗栖太, 片山浩之, 古米弘明

    日本水環境学会シンポジウム講演集   13th   347 - 352   2010.9

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 都市河川における存在形態を考慮した亜鉛等重金属の濃度及び挙動の評価

    小島啓輔, 端昭彦, 春日郁朗, 栗栖太, 片山浩之, 古米弘明

    土木学会年次学術講演会講演概要集(CD-ROM)   65th   ROMBUNNO.VII-006   2010.8

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • メタン生成嫌気集積培養系におけるベンゼン分解経路の同位体トレーサーを用いた検討

    舛本弘毅, 栗栖太, 對馬育夫, 春日郁朗, 古米弘明

    日本水環境学会年会講演集   44th   422   2010.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • メタン生成ベンゼン分解集積培養系における微生物群集構造および機能解析

    對馬育夫, 舛本弘毅, 春日郁朗, 栗栖太, 古米弘明

    日本水環境学会年会講演集   44th   423   2010.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 雨天時路面排水中における道路塵埃由来の重金属の溶出特性と存在形態評価

    小島啓輔, 春日郁朗, 栗栖太, 片山浩之, 古米弘明

    日本水環境学会年会講演集   44th   128   2010.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 受水槽におけるL pneumophilaの消長に及ぼす残留塩素の影響に関する実験的検討

    井上葵, 春日郁朗, 片山浩之, 栗栖太, 古米弘明

    日本水環境学会年会講演集   44th   173   2010.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 微生物叢ゲノム断片プローブを用いたアイソトープアレイによる活性汚泥中の酢酸およびメタノール資化微生物の検出

    飛野智宏, 栗栖太, 春日郁朗, 古米弘明

    日本水環境学会年会講演集   44th   532   2010.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • Characterization of monooxygenase gene diversity in benzene-amended soils

    S. Iwai, F. Kurisu, H. Urakawa, O. Yagi, H. Furumai

    LETTERS IN APPLIED MICROBIOLOGY   50 ( 2 )   138 - 145   2010.2

     More details

    Language:English   Publisher:WILEY-BLACKWELL PUBLISHING, INC  

    Aim:
    To understand soil benzene monooxygenase gene diversity by clone library construction and microarray profiling.
    Methods and Results:
    A primer set was designed, and benzene monooxygenase gene diversity was characterized in two benzene-amended soils. The dominant sequence types in the clone libraries were distinct between the two soils, and both sequences were assigned to novel clusters. Monooxygenase gene richness and diversity increased after benzene degradation. Oligonucleotide probes for microarray analysis were designed to detect a number of sequenced clones and reported monooxygenase genes. The microarray detected several genes that were not detected in the clone libraries of the same samples. Six probes were detected in more than one soil.
    Conclusions:
    The primer set designed in this study successfully detected diverse benzene monooxygenase genes. The level of diversity may have increased because the degradation of benzene differed from soil to soil. Microarrays have great potential in the comprehensive detection of gene richness as well as the elucidation of key genes for degradation.
    Significance and Impact of the Study:
    This study introduces a new primer set that may be used to identify diverse benzene monooxygenase genes in the environment; moreover, it demonstrates the potential of microarray technology in the profiling of environmental samples.

    DOI: 10.1111/j.1472-765X.2009.02764.x

    Web of Science

    PubMed

    researchmap

  • Evaluating the mobile heavy metal pool in soakaway sediment, road dust and soil through sequential extraction and isotopic exchange

    Manish Kumar, Hiroaki Furumai, Futoshi Kurisu, Ikuro Kasuga

    WATER SCIENCE AND TECHNOLOGY   62 ( 4 )   920 - 928   2010

     More details

    Language:English   Publisher:IWA PUBLISHING  

    Selective sequential dissolution (SSD) and isotopic dilution are two most commonly applied techniques for the measurement of mobile fraction of heavy metal present in the urban environment This work examined the compliance between SSD proposed by the Community Bureau of Reference (BCR) and isotopic dilution technique (IDT) for determination of mobile pool of heavy metal contained in soakaway sediment, road dust, and soil sample Heavy metals (Cu, Zn, Cd and Pb) were fractionated using the three-stage BCR protocol, while isotopically exchangeable metal concentrations (E-value) were investigated through isotopic tracers ((111)Cd, (65)Cu, (207)pb and (66)Zn) In general, total contamination level, E-value and BCR exchangeable fractions of different samples followed the similar order of road dust &gt; soakaway sediment &gt; soil Results revealed that the E-value exceeded the BCR exchangeable fraction in all samples In addition, the first three fractions of BCR which have potential to become mobile under certain environmental conditions were collectively termed as "potential mobile pool" and compared with E-value It was concluded that metal extracted by weak acid underestimates the exchangeable fraction while the potential mobile pool extracted by three reagents overestimates the real mobile forms of heavy metals However, better mobility characteristics of heavy metals can be assessed by coupling information obtained through sequential extraction and isotopic exchange.

    DOI: 10.2166/wst.2010.911

    Web of Science

    researchmap

  • インフルエンザウイルス(H1N1およびH5N3亜型)の塩素,モノクロラミンおよび紫外線による不活化特性

    北島正章, 片山浩之, 高田礼人, 古米弘明

    日本水環境学会年会講演集   44th   2010

  • 水環境中における病原ウイルスの分子疫学的解析および感染リスク評価

    北島正章, 片山浩之, 古米弘明

    日本水環境学会シンポジウム講演集   13th   2010

  • H5N1高病原性鳥インフルエンザウイルスの水系感染リスクの定量的評価

    北島正章, 片山浩之, HAAS Charles N., 古米弘明

    環境工学研究論文集   47   2010

  • A型インフルエンザウイルスに対する塩素,モノクロラミンおよび紫外線消毒の有効性

    北島正章, 片山浩之, 高田礼人, 古米弘明

    全国水道研究発表会講演集   61st   2010

  • 1C-2 嫌気集積培養系によるベンゼンからのメタン生成の同位体トレーサーを用いた確認(口頭発表)

    舛本 弘毅, 栗栖 太, 春日 郁朗, 古米 弘明

    日本微生物生態学会講演要旨集   0 ( 25 )   2009.11

     More details

    Language:Japanese   Publisher:日本微生物生態学会  

    researchmap

  • カイミジンコ底質毒性試験における毒性要因推定のための吸着剤添加法の適用と課題

    渡部春奈, 春日郁朗, 古米弘明, 栗栖太, 中島典之

    日本水環境学会シンポジウム講演集   12th   285 - 290   2009.9

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • Utilizing rainwater and reclaimed water for sustainable water use in urban areas

    Journal of municipal problems.   61 ( 7 )   28 - 43   2009.7

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • 生物活性炭立ち上げ時の微生物定着に及ぼす前塩素処理の影響

    春日郁朗, 中垣宏隆, 栗栖太, 古米弘明, 関哲雄

    全国水道研究発表会講演集   60th   164 - 165   2009.5

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 培養法と分子生物学的手法を用いた給水末端における細菌群の多様性評価

    前田裕太, 春日郁朗, 栗栖太, 古米弘明

    全国水道研究発表会講演集   60th   462 - 463   2009.5

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • Sorption behavior of heavy metal species by soakaway sediment receiving urban road runoff from residential and heavily trafficked areas

    Michio Murakamia, Makoto Fujita, Hiroaki Furumai, Ikuro Kasuga, Futoshi Kurisu

    JOURNAL OF HAZARDOUS MATERIALS   164 ( 2-3 )   707 - 712   2009.5

     More details

    Language:English   Publisher:ELSEVIER SCIENCE BV  

    Groundwater contamination by heavy metals from infiltration facilities receiving road runoff is of potential concern. In this study, sorption tests were conducted to evaluate the influence of the water quality of road runoff, especially dissolved organic matter (DOM), on the sorption of heavy metal species by soakaway sediment. Sequential batch tests were conducted to assess metal sorption by the soakaway sediment receiving road runoff from residential and heavily trafficked areas. Ni was adsorbed by the sediment, indicating that soakaway sediments function to prevent groundwater contamination by Ni. In contrast, Zn was released from the soakaway sediment in sorption tests using heavily trafficked road dust leachates. Ni, Cu, Zn, and dissolved organic carbon concentrations were higher in soakaway sediment leachates obtained by sorption tests using heavily trafficked road dust leachates than those using residential road dust leachates, suggesting traffic activities contaminate these pollutants. A large portion of Zn, released from the soakaway sediment, existed as stable complexes. DOM in road runoff possibly enhances the release of Zn from the sediments within infiltration facilities and might cause groundwater contamination. (c) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jhazmat.2008.08.052

    Web of Science

    PubMed

    researchmap

  • 下水道管渠内堆積物中重金属の存在形態評価への蛍光XAFSの適用

    小島啓輔, 春日郁朗, 栗栖太, 古米弘明

    KEK Proc   ( 2009-1 )   92 - 97   2009.5

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • X線吸収微細構造解析を用いた下水道管渠内堆積物及び道路塵埃中の亜鉛の存在形態評価

    小島啓輔, 春日郁朗, 古米弘明, 栗栖太

    日本水環境学会年会講演集   43rd   198   2009.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • クロロエチレン類の還元的脱塩素における塩化ビニルの蓄積と脱塩素促進因子の検討

    綿貫健文, 栗栖太, 春日郁朗, 古米弘明

    日本水環境学会年会講演集   43rd   282   2009.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 複数土壌からの嫌気ベンゼン分解微生物群の集積と分解活性に及ぼす温度の影響

    舛本弘毅, 栗栖太, 春日郁朗, 古米弘明

    日本水環境学会年会講演集   43rd   281   2009.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 高度浄水処理施設における生物活性炭への硝化微生物の定着過程の評価

    中垣宏隆, 春日郁朗, 栗栖太, 古米弘明

    日本水環境学会年会講演集   43rd   289   2009.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 活性汚泥に与えるエストロジェンの濃度レベルと分解微生物種

    栗栖太, ZANG Kaisai, JANHOM Tansiphorn, 春日郁朗, 古米弘明

    日本水環境学会年会講演集   43rd   258   2009.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 微生物叢ゲノム断片を用いたアイソトープアレイにおける特異性および検出感度の検討

    飛野智宏, 栗栖太, 春日郁朗, 古米弘明

    日本水環境学会年会講演集   43rd   102   2009.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • カイミジンコ底質毒性試験における毒性要因推定のための吸着剤添加法の適用と課題

    渡部春奈, 春日郁朗, 古米弘明, 栗栖太, 中島典之

    日本水環境学会年会講演集   43rd   391   2009.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • Competitive adsorption of heavy metals in soil underlying an infiltration facility installed in an urban area

    M. A. Hossain, H. Furumai, F. Nakajima

    WATER SCIENCE AND TECHNOLOGY   59 ( 2 )   303 - 310   2009

     More details

    Language:English   Publisher:I W A PUBLISHING  

    Accumulation of heavy metals at elevated concentration and potential of considerable amount of the accumulated heavy metals to reach the soil system was observed from earlier studies in soakaways sediments within an infiltration facility in Tokyo, Japan. In order to understand the competitive adsorption behaviour of heavy metals Zn, Ni and Cu in soil, competitive batch adsorption experiments were carried out using single metal and binary metal combinations on soil samples representative of underlying soil and surface soil at the site. Speciation analysis of the adsorbed metals was carried out through BCR sequential extraction method. Among the metals, Cu was not affected by competition while Zn and Ni were affected by competition of coexisting metals. The parameters of fitted &apos;Freundlich&apos; and &apos;Langmuir&apos; isotherms indicated more intense competition in underlying soil compared to surface soil for adsorption of Zn and Ni. The speciation of adsorbed metals revealed less selectivity of Zn and Ni to soil organic matter, while dominance of organic bound fraction was observed for Cu, especially in organic rich surface soil. Compared to underlying soil, the surface soil is expected to provide greater adsorption to heavy metals as well as provide greater stability to adsorbed metals, especially for Cu.

    DOI: 10.2166/wst.2009.865

    Web of Science

    PubMed

    researchmap

  • 都市活動に由来する亜鉛の存在形態評価

    小島啓輔, 春日郁朗, 栗栖太, 古米弘明

    PFシンポジウム要旨集   26th   246   2009

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 雨天時排水中硝酸イオンの窒素と酸素の安定同位体比を用いた窒素汚濁起源の評価

    島啓輔, 村上道夫, 古米弘明, 由水千景, 陀安一郎, 永田俊

    第46回下水道研究発表会   2009

     More details

    Language:Japanese  

    researchmap

  • Acetate uptake efficiency of polyphosphate-accumulating organisms under exposure to surfactants

    K. Tsuji, M. Fujita, H. Furumai

    WATER SCIENCE AND TECHNOLOGY   60 ( 11 )   2775 - 2780   2009

     More details

    Language:English   Publisher:I W A PUBLISHING  

    We investigated the influence of surfactants such as linear alkylbenzene sulfonates (LAS) and alcohol ethoxylates (AE) on acetate uptake by polyphosphate-accumulating organisms (PAOs) under anaerobic conditions, using the phosphate requirement for acetate uptake (+Delta P/-Delta Ac ratio). In order to estimate the +Delta P/-Delta Ac ratio, anaerobic batch tests were conducted using activated sludge collected from an anaerobic/oxic sequencing batch reactor used to treat municipal wastewater continuously supplemented with a detergent containing LAS and AE. We demonstrated that LAS and AE have both positive and negative impacts on acetate uptake by PAOs. The disadvantage is that long-term exposure to the detergent inhibits acetate uptake by PAOs, thus deteriorating the efficiency, even if the surfactants are no longer present during the tests. Furthermore, the existence of LAS and/or AE with acetate further diminishes the efficiency. The advantage is that LAS and AE are potential sources of polyhydroxyalkanoate for PAOs, because acetate is produced from the surfactants under anaerobic conditions.

    DOI: 10.2166/wst.2009.104

    Web of Science

    PubMed

    researchmap

  • Effects of sewerage effluent recharge on the microbial community in a soil column model

    Yoshiko Sakata, Futoshi Kurisu, Osami Yagi, Hiroaki Furumai

    Japanese Journal of Water Treatment Biology   45 ( 2 )   63 - 74   2009

  • Isotope Array Using Random Genomic DNA Probes Derived from a Microbial Community for Substrate-Specific Detection of Microorganisms

    TOBINO Tomohiro, KURISU Futoshi, KASUGA Ikuro, FURUMAI Hiroaki

    Japan journal of water pollution research   32 ( 11 )   595 - 601   2009

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    A method for the specific detection of microorganisms that assimilate radioactive substrates was combined with the use of membrane arrays consisting of random genomic DNA fragment probes prepared from the original microbial community.The feasibility of this combined method was investigated in terms of specificity, sensitivity and the applicability to the analysis of environmental samples. DNA fragment probes prepared from pure cultures exhibited specific signals to their cognate targets although one probe derived from the rRNA gene was found to be cross-hybridized. Strong correlations of signal intensity with both the amount of probe spotted and the concentration of 14C-labeled DNA in the hybridization buffer were observed after hybridization with a membrane array using whole genomic DNA as probes. A membrane array was fabricated from an activated sludge sample and hybridized with 14C-DNA extracted from the same sample grown on either 14C-acetate or 14C-methanol. One out of 48 spots was detected for each target and the positions of the two spots were found to be Identical, thus indicating the specific detection of 14C-assimilating microorganisms and a microorganism capable of assimilating both acetate and methanol.

    DOI: 10.2965/jswe.32.595

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00340960750?from=CiNii

  • XAFS法及び逐次抽出法を用いた合流式下水道管渠内堆積物中の亜鉛の存在形態の推定

    小島啓輔, 春日郁郎, 栗栖太, 古米弘明

    環境工学研究論文集   46   187 - 195   2009

     More details

  • Effects of Treated Wastewater Discharge on Dynamics of Particulate Organic Matter and Community Structure of Benthic Macroinvertebrates in an Urban River

    HOSOMI Akihiko, KASUGA Ikuro, FURUMAI Hiroaki, YOSHIMURA Chihiro, NAKAJIMA Fumiyuki, KAGAYA Takashi, KURISU Futoshi

    Japan journal of water pollution research   32 ( 7 )   375 - 381   2009

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    Urban river ecosystems are under the influence of treated wastewater effluent, but the relationship between the effluent and aquatic food web has not been well understood. In the Tama River, we investigated the effects of treated wastewater on a benthic macroinvertebrate community and main food sources for aquatic organisms including periphyton and fine particulate organic matter (FPOM). After the discharge point, the nutrient concentration significantly increased, and the δ15N of periphyton increased from 4.2‰ to 14.5‰. Furthermore, FPOM collected after the discharge point and suspended solids contained in wastewater effluent showed higher δ15N values than FPOM collected from the upstream section having no treated wastewater effect. In a macroinvertebrate community, an increase in δ15N was also observed for gatherers and filterers mainly feeding on FPOM after the discharge point. These results imply that the effects of treated wastewater discharge extend to consumers in the food web structure through primary production and FPOM.

    DOI: 10.2965/jswe.32.375

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00334789435?from=CiNii

  • Effects of Treated Wastewater Discharge on Dynamics of Particulate Organic Matter and Community Structure of Benthic Macroinvertebrates in an Urban River

    Hosomi A, Kasuga I, Furumai H, Yoshimura C, Nakajima F, Kagaya T, Kurisu F

    J Jap Soc Wat Environ   32 ( 7 )   375 - 381   2009

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    Urban river ecosystems are under the influence of treated wastewater effluent, but the relationship between the effluent and aquatic food web has not been well understood. In the Tama River, we investigated the effects of treated wastewater on a benthic macroinvertebrate community and main food sources for aquatic organisms including periphyton and fine particulate organic matter (FPOM). After the discharge point, the nutrient concentration significantly increased, and the δ15N of periphyton increased from 4.2‰ to 14.5‰. Furthermore, FPOM collected after the discharge point and suspended solids contained in wastewater effluent showed higher δ15N values than FPOM collected from the upstream section having no treated wastewater effect. In a macroinvertebrate community, an increase in δ15N was also observed for gatherers and filterers mainly feeding on FPOM after the discharge point. These results imply that the effects of treated wastewater discharge extend to consumers in the food web structure through primary production and FPOM.

    DOI: 10.2965/jswe.32.375

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00334789435?from=CiNii

  • Real-time PCR Analysis of Candidatus 'Accumulibacter phosphatis' in A/O Activated Sludge Enhancing Phosphate Release Activity

    TSUJI Koji, FUJITA Masafumi, AKASHI Akira, FUKUSHIMA Toshikazu, FURUMAI Hiroaki

    Japan journal of water pollution research   32 ( 2 )   87 - 91   2009

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    An A/O SBR fed with acetate as the sole carbon source was operated for 183 days to examine the dynamic behavior of Candidatus 'Accumulibacter phosphatis' (Accumulibacter) in activated sludge enhancing phosphate release activity due to an increase in pH from 7.0 to 8.2. The result obtained by real-time PCR analysis showed that the copy number of Accumulibacter gradually increased until 89 days after a lag period of around 60 days. After that, polyphosphate-accumulating organisms (PAOs) other than Accumulibacter probably proliferated, considering the dynamic change in phosphate release activity. Consequently, the significant acetate uptake by PAOs likely reduced the proliferation of glycogen-accumulating organisms at high pH.

    DOI: 10.2965/jswe.32.87

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00326736959?from=CiNii

  • Evaluation of water balance and water use stress in principal cities in Japan

    Journal of water and waste   51 ( 2 )   137 - 148   2009

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • Understanding the partitioning processes of mobile lead in soakaway sediments using sequential extraction and isotope analysis

    Manish Kumar, Hiroaki Furumai, Futoshi Kurisu, Ikuro Kasuga

    WATER SCIENCE AND TECHNOLOGY   60 ( 8 )   2085 - 2091   2009

     More details

    Language:English   Publishing type:Book review, literature introduction, etc.   Publisher:I W A PUBLISHING  

    Lead (Pb) isotopic data were used in this study to first distinguish the partitioning of anthropogenic and natural lead in different fractions, obtained by BCR sequential extraction, and then to anticipate their mixing process in the soakaway sediment of artificial infiltration facilities (AIF). Total metal content was found higher in soakaway sediment samples than that of soil. The lowest (206)Pb/(207)Pb ratios were mostly observed in exchangeable fractions of soil and sediment samples, while residual fractions mostly showed the highest (206)Pb/(207)Pb and (208)Pb/(207)Pb ratios than those of other fractions. In general, both ratios were higher in the soil than those of sediments. Further among soil samples, residual fraction of bottom soil exhibited higher ratios than surface soil indicating higher contribution of natural lead with depth. In addition, the difference in Pb content, partitioning and its isotope signature among four sediment samples were also investigated considering their sampling locations. The plot of (206)Pb/(207)Pb versus (208)Pb/(207)Pb showed two well demarcated cluster formations by soil and sediments samples that describe the partitioning between anthropogenic and natural lead; and some points falling in between soil and sediment samples pertinently illustrated the mixing processes between these two different pools of lead.

    DOI: 10.2166/wst.2009.512

    Web of Science

    PubMed

    researchmap

  • Analysis of urban water problems in Medan City, Indonesia

    Kurisu F, Kawashima S, Kasuga I, Furumai H

    (In) Takizawa S, Kurisu F and Satoh H (Ed), Southeast Asian Water Environment 3   45 - 50   2009

     More details

  • Diurnal fluctuation of indicator microorganisms and intestinal viruses in combined sewer system

    W. J. Kim, S. Managaki, H. Furumai, F. Nakajima

    WATER SCIENCE AND TECHNOLOGY   60 ( 11 )   2791 - 2801   2009

     More details

    Language:English   Publisher:I W A PUBLISHING  

    Combined sewer overflow (CSO) has been considered to be a source of pathogenic microorganisms for aquatic environment. For the effective control and treatment of CSOs, the microbial behavior in combined sewer system (CSS) needs to be investigated. In this study, whole-day extensive monitoring of indicator microorganisms and intestinal viruses in dry weather flow (DWF) was conducted at a small residential urban drainage area with CSS. All indicator bacteria represented similar diurnal variations in the two different monitoring campaigns; their concentrations gradually decreased to the minimum at the dawn (around 5 a. m.), increased sharply to the maximum around 7 to 8 a. m., and remained rather constant from noon to midnight. On the other hand, neither coliphages nor intestinal viruses showed any concentration peaks in the morning. The maximum/minimum load ratios ranged from 18 to 42 for total coliforms, fecal coliforms and E. coli, whereas those ratios for coliphages, enteroviruses and noroviruses G2 showed greater values than those for indicator bacteria. These results indicate that the diurnal variation patterns of bacterial and viral concentrations in DWF should be considered, which affect the discharge characteristics of each microorganism and the loads of bacteria and viruses in CSOs significantly vary with the overflow time as well.

    DOI: 10.2166/wst.2009.732

    Web of Science

    PubMed

    researchmap

  • 合流式下水道管渠内堆積物の重金属含有量とその存在形態評価

    小島啓輔, 春日郁朗, 栗栖太, 古米弘明

    環境工学研究フォーラム講演集   45th   17 - 19   2008.11

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • Chemical properties, microbial respiration, and decomposition of coarse and fine particulate organic matter

    Chihiro Yoshimura, Mark O. Gessner, Klement Tockner, Hiroaki Furumai

    JOURNAL OF THE NORTH AMERICAN BENTHOLOGICAL SOCIETY   27 ( 3 )   664 - 673   2008.9

     More details

    Language:English   Publisher:NORTH AMER BENTHOLOGICAL SOC  

    Fine particulate organic matter (FPOM) plays a critical role in structuring and sustaining stream food webs by providing an essential resource for various organisms. Our goal was to elucidate FPOM dynamics by determining chemical properties, microbial respiration, and in situ decomposition rates of different FPOM fractions in relation to the parent coarse particulate organic matter (CPOM). FPOM (100-500 mu m) of defined quality was produced by feeding 5 types of CPOM to shredding amphipods (Gammarus spp.): wood, filamentous green algae, and conditioned leaves of ash, alder, and oak. Feeding and defecation of Gammarus homogenized POM of the different origins in terms of proximate lignin and nutrient content. FPOM had higher lignin content (20.5-45.6%) than did parental CPOM (5.7-26.8%), whereas molar ON decreased during the conversion of CPOM (12-109) to FPOM (10-34). Microbial respiration rates on leaf-derived FPOM were lower (0.13-0.45 mg O-2 g(-1) C h(-1)) compared to rates measured for parent CPOM (0-37-0.80 mg O-2 g(-1) C h(-1)). Furthermore, microbial decomposition over 2 mo in a stream was slower for leaf-derived FPOM (k &lt; 0.0015/d) than for the parent CPOM (k=0.0013-0.0049/d), and this pattern resulted in a positive correlation between rates of microbial respiration and decomposition. Overall, our data indicate that transformation of CPOM to FPOM has a homogenizing effect toward lower C quality, which, in turn, reduces microbial activity and decomposition rate.

    DOI: 10.1899/07-106.1

    Web of Science

    researchmap

  • Development of an oligonucleotide microarray to detect di- and monooxygenase genes for benzene degradation in soil

    Shoko Iwai, Futoshi Kurisu, Hidetoshi Urakawa, Osami Yagi, Ikuro Kasuga, Hiroaki Furumai

    FEMS MICROBIOLOGY LETTERS   285 ( 1 )   111 - 121   2008.8

     More details

    Language:English   Publisher:WILEY-BLACKWELL  

    Diverse environmental genes have been identified recently. To characterize their functions, it is necessary to understand which genes and what combinations of those genes are responsible for the biodegradation of soil contaminants. In this article, a 60-mer oligonucleotide microarray was constructed to simultaneously detect di- and monooxygenase genes for benzene and related compounds. In total, 148 probes were designed and validated by pure-culture hybridizations using the following criteria to discriminate between highly homologous genes: &lt;= 53-bp identities and &lt;= 25-bp continuous stretch to nontarget sequences. Microarray hybridizations were performed using PCR products amplified from five benzene-amended soils and two oil-contaminated soils. Six of the probes gave a positive signal for more than six soils; thus, they may represent key sequences for benzene degradation in the environment. The microarray developed in this study will be a powerful tool for the screening of key genes involved in benzene degradation and for the rapid profiling of benzene oxygenase gene diversity in contaminated soils.

    DOI: 10.1111/j.1574-6968.2008.01223.x

    Web of Science

    researchmap

  • Analysis of the phylogenetic diversity of estrone-degrading bacteria in activated sewage sludge using microautoradiography-fluorescence in situ hybridization

    Kaisai Zang, Futoshi Kurisu, Ikuro Kasuga, Hiroaki Furumai, Osami Yagi

    SYSTEMATIC AND APPLIED MICROBIOLOGY   31 ( 3 )   206 - 214   2008.8

     More details

    Language:English   Publisher:ELSEVIER GMBH, URBAN & FISCHER VERLAG  

    In situ uptake of [2,4.6,7-H-3(N)]estrone ([H-3]E1) by the major phylogenetic groups present in activated sludge samples from two different municipal wastewater treatment plants was investigated using microautoradiography-fluorescence in situ hybridization (MAR-FISH). Approximately 1-2% of the total cells confined in the samples by an EUB probe mix contributed to E1 assimilation. Almost all the detected E1-assimilating cells involved in the early phase of E1 degradation were affiliated with the Beta- and Gammaproteobacteria. In the early phase of E1 degradation, no E1-assimilating cells affiliated with the Alphaproteobacteria, Actinobacteria, the Cytophaga-flavobacterium cluster of Phylum Bacteroidetes, or the phyla Chloroflexi, Nitrospira and Planctomycetes were detected. Bacteria affiliated with the Betaproteobacteria in the shape of long rods or chains of rods were found to contribute most to in situ E1 degradation. They contributed 61% and 82% of total E1-assimilating cells in cultures from two sources of activated sludge spiked with [H-3]E1. The E1-degrading bacteria related to the Betaproteobacteria differed phylogenetically from the aerobic E1-degrading bacterial isolates reported in previous studies. In addition, MAR-FISH revealed the significant contribution of E1-degrading bacteria affiliated with the Gammaproteobacteria in the degradation of E1 in activated Sludge. (c) 2008 Elsevier GmbH. All rights reserved.

    DOI: 10.1016/j.syapm.2008.03.005

    Web of Science

    PubMed

    researchmap

  • Research on scoring and grouping of raw water quality using multivariate analysis

    Environmental & sanitary engineering research   22 ( 3 )   23 - 26   2008.7

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • Multiple evaluations of the removal of pollutants in road runoff by soil infiltration

    Michio Murakami, Nobuyuki Sato, Aya Anegawa, Norihide Nakada, Arata Harada, Toshiya Komatsu, Hideshige Takada, Hiroaki Tanaka, Yoshiro Ono, Hiroaki Furumai

    WATER RESEARCH   42 ( 10-11 )   2745 - 2755   2008.5

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Groundwater replenishment by infiltration of road runoff is expected to be a promising option for ensuring a sustainable urban water cycle. In this study, we performed a soil infiltration column test using artificial road runoff equivalent to approximately 11-12 years of rainfall to evaluate the removal of pollutants by using various chemical analyses and bioassay tests. These results indicated that soil infiltration treatment works effectively to remove most of the pollutants such as organic matter (chemical oxygen demand (CODMn) and dissolved organic carbon (DOC)), P species, polycyclic aromatic hydrocarbons (PAHs), numerous heavy metals and oestrogenic activities. Bioassay tests, including algal growth inhibition test, Microtox (R) and mutagen formation potential (MFP) test, also revealed effective removal of toxicities by the soils. However, limited amounts of NO3, Mn, Ni, alkaline earth metals, perfluorooctane sulphonate (PFOS) and perfluorooctane sulphonamide (FOSA) were removed by the soils and they possibly reach the groundwater and cause contamination. (c) 2008 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.watres.2008.02.004

    Web of Science

    PubMed

    researchmap

  • Toward the Predictive and Preventive Actions for Conservation and Regeneration of Water-resource Environment

    FURUMAI Hiroaki

    31 ( 4 )   171 - 171   2008.4

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • 同化性有機炭素の除去に関与する生物活性炭付着微生物のCTC‐FISH法による解析

    齋藤寛之, 春日郁朗, 栗栖太, 古米弘明

    日本水環境学会年会講演集   42nd   55   2008.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 生物活性炭上のアンモニア酸化細菌・古細菌のT‐RFLP法による多様性解析

    中垣宏隆, 春日郁朗, 栗栖太, 古米弘明, 国包章一

    日本水環境学会年会講演集   42nd   54   2008.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 異なる雨水浸透桝堆積物による道路排水中重金属の吸脱着特性の比較

    藤田誠, 春日郁朗, 栗栖太, 古米弘明

    日本水環境学会年会講演集   42nd   5   2008.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • The sorption of heavy metal species by sediments in soakaways receiving urban road runoff

    Michio Murakami, Fumiyuki Nakajima, Hiroaki Furumai

    CHEMOSPHERE   70 ( 11 )   2099 - 2109   2008.2

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Infiltration facilities are designed for both the retention of non-point pollutants and the replenishment of groundwater in urban areas. In this study, sorption tests were conducted to evaluate the speciation of heavy metals and their behaviour in infiltration facilities receiving urban road runoff containing high DOC concentrations and stable heavy metal organic complexes. Road dust and three soakaway sediments were collected from heavy traffic areas and a residential area with an infiltration-type sewerage system in Tokyo, Japan. Sequential multiple batch tests were conducted by adding prepared road dust leachate (artificial road runoff) or deionised water to soakaway sediment to obtain soakaway sediment leachate (artificial percolating water from soakaway sediment), which mimicked the sorption by sediments in soakaways receiving urban road runoff. Heavy metal speciation was assessed by means of a combination of anion-exchange resin measurements and MINTEQA2 model calculations, and further validated by chelating resin measurements. In road dust leachates and soakaway sediment leachates, Cu predominantly existed as organic complexes and carbonates, whereas most Mn, Zn and Cd were found to exist in the form of free ions and carbonate complexes. Stable organic complexes of Cu in road dust leachates were strongly adsorbed by soakaway sediments despite the limited adsorption of DOC. On the other hand, desorption of free Mn, Zn and Cd ions from the sediment receiving road dust leachates was observed, indicating that heavy metals such as Mn, Zn and Cd may ultimately reach groundwater as free ions. (c) 2007 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.chemosphere.2007.08.073

    Web of Science

    researchmap

  • 都市における浸水のシミュレーション

    古米弘明

    科学   78 ( 10 )   1134 - 1137   2008

     More details

  • Evaluation of source water quality for selection of drinking water purification system

    N. Hayashi, H. Yokota, H. Furumai, M. Fujiwara

    Water Science and Technology: Water Supply   8 ( 3 )   271 - 278   2008

     More details

    Language:English  

    When renewing water purification facilities, it is important to select a suitable purification system that can accommodate the quality of the respective source water. The Japan Water Research Center has been collecting a large amount of water quality data from drinking-water utilities across Japan, categorising and analysing these data, and evaluating the suitability of water purification processes. Multivariate analyses such as hierarchical cluster analysis and principal component analysis were performed to investigate the relationships between the quality of source water used for water supply and various factors that affect the purification process. Based on these results, water sources throughout Japan were clearly categorised into four groups, and suitable water purification systems were identified for the different water quality groups, The results can serve as an important reference for water utilities during future facility renewal projects. © IWA Publishing 2008.

    DOI: 10.2166/ws.2008.071

    Scopus

    researchmap

  • Rainwater and reclaimed wastewater for sustainable urban water use

    Hiroaki Furumai

    PHYSICS AND CHEMISTRY OF THE EARTH   33 ( 5 )   340 - 346   2008

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Concern about the sustainability of urban water use is the strong motivation to understand the potential of rainwater use and water recycling in urbanized cities. The history of water supply in Tokyo and its experience may provide useful information to develop sustainable urban water use and find future possible tasks in rapidly growing cities. Besides, various innovative strategies to meet the current and future water demand in Tokyo may help us to consider new approaches adjusting to the developing mega cities in Asia. In this paper, the past and current practices on utilization of latent water resources such as rainwater and reclaimed wastewater in Tokyo are summarized from the viewpoint of sustainable water use.
    The storage of rainwater is a useful measure for water demand in emergency cases. In addition, the rainwater use can work as a kind of environmental education to make citizens aware of sustainable urban water use. There are 850 facilities for rainwater use in Tokyo. Since reclaimed wastewater use has several benefits, a huge water volume has been utilized for various purposes such as washing, water-cooling, toilet flushing, waterway restoration and creation of recreational waterfront. From the viewpoint of human health risk, new micropollutants such as estrogens, endocrine disrupters and surfactants should be considered as quality guideline parameter besides the conventional ones. Importance of infiltration facilities should be also highlighted to secure the sound water cycle. Groundwater recharge through the infiltration facilities provide a potential storage of water resource which can be withdrawn in the future if necessary. (C) 2008 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.pce.2008.02.029

    Web of Science

    researchmap

  • Trace metal speciation during dry and wet weather flows in the Tama River, Japan, by using diffusive gradients in thin films (DGT)

    Nyein Nyein Aung, Fumiyuki Nakajima, Hiroaki Furumai

    JOURNAL OF ENVIRONMENTAL MONITORING   10 ( 2 )   219 - 230   2008

     More details

    Language:English   Publisher:ROYAL SOC CHEMISTRY  

    The labile species of Ni, Cu, Zn, Cd, and Pb in the Tama River, an urban river in Tokyo, Japan, were measured using diffusive gradients in thin films (DGT) method under dry and wet weather conditions, and the results were compared with total dissolved concentrations in hourly samples collected in parallel. A total of 10 DGT deployments were made and 251 hourly samples were collected during 2 rounds of sampling, conducted between August and October, 2006. Two types of diffusive gradients in thin films (DGT) devices - DGT-RG for labile inorganic and DGT-APA for total (inorganic and organic) labile species - were applied throughout the samplings. The proportions of metals measured by DGT, compared with the dissolved metal concentrations (filtered using a membrane of 0.5 mu m pore size), were 38 +/- 5% (RG) and 45 +/- 8% (APA) for Ni and 45 +/- 22% (RG) and 53 +/- 23% (APA) for Zn. No labile Cu was detected throughout the sampling; Cu was assumed to be in stable complexed forms. Labile Pb was detected in 3 out of 10 deployments only; the rest were lower than the detection limit. Dissolved and labile Cd concentrations were below the detection limits. Three rain events encountered during the sampling periods were evaluated. Rains brought considerably higher loads of metals in dissolved form, and DGT measurements indicated that labile metal loads also increased. Selected DGT measurements were compared with the WHAM 6 speciation model and found to be similar to the model-computed results.

    DOI: 10.1039/b709717d

    Web of Science

    PubMed

    researchmap

  • 原水水質の累積頻度分布特性に基づく浄水フロー推定法の検討

    古米弘明, 藤原正弘, 山口太秀, 林野

    全国水道研究発表会講演集   59th   2008

  • Sorption of Heavy Metals by Sediments in Soakaways

    FUJITA Makoto, MURAKAMI Michio, FURUMAI Hiroaki, KASUGA Ikuro, KURISU Futoshi

    Japan journal of water pollution research   31 ( 11 )   685 - 689   2008

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    To investigate the behavior of heavy metals in infiltration facilities receiving urban road runoff, we performed batch tests, which mimicked the sorption of heavy-metal species in road runoff by soakaway sediments. In soakaway sediment leachates, Ni and Cu were dominantly present as stable complexes, whereas most Zn existed as free ions and labile complexes. Ni and Cu in road runoff were adsorbed by all the soakaway sediments, whereas Zn was released from some soakaway sediments. Instead of the total Zn content in the soakaway sediments, the soluble fraction of Zn (i.e., the concentration of Zn released from sediments by deionized water) was a governing factor for the sorption from soakaways receiving road runoff; however, the behavior of Ni and Cu was not well explained by the total metal content, soluble fraction, and organic content. Desorption tests are useful in identifying soakaway sediments with limited adsorption capacities for Zn. The control and management of sediments based on desorption tests would be effective in minimizing groundwater contamination by heavy metals through infiltration facilities.

    DOI: 10.2965/jswe.31.685

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00322258479?from=CiNii

  • Sorption of Heavy Metals by Sediments in Soakaways

    Fujita M, Murakami M, Furumai H, Kasuga I, Kurisu F

    J Jap Soc Wat Environ   31 ( 11 )   685 - 689   2008

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    To investigate the behavior of heavy metals in infiltration facilities receiving urban road runoff, we performed batch tests, which mimicked the sorption of heavy-metal species in road runoff by soakaway sediments. In soakaway sediment leachates, Ni and Cu were dominantly present as stable complexes, whereas most Zn existed as free ions and labile complexes. Ni and Cu in road runoff were adsorbed by all the soakaway sediments, whereas Zn was released from some soakaway sediments. Instead of the total Zn content in the soakaway sediments, the soluble fraction of Zn (i.e., the concentration of Zn released from sediments by deionized water) was a governing factor for the sorption from soakaways receiving road runoff; however, the behavior of Ni and Cu was not well explained by the total metal content, soluble fraction, and organic content. Desorption tests are useful in identifying soakaway sediments with limited adsorption capacities for Zn. The control and management of sediments based on desorption tests would be effective in minimizing groundwater contamination by heavy metals through infiltration facilities.

    DOI: 10.2965/jswe.31.685

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00322258479?from=CiNii

  • 合流式下水道小排水区における晴天時下水の濃度と負荷量の時間変動特性評価

    金元載, 古米弘明, 真名垣聡, 中島典之

    下水道協会誌   45 ( 543 )   135 - 146   2008

     More details

  • 降雨特性の異なる66降雨における雨水浸透施設からの浸透量の評価

    用水と廃水   50 ( 3 )   227 - 234   2008

     More details

  • Heavy metal (Zn and Cu) complexation and molecular size distribution in wastewater treatment plant effluent

    G. G. T. Chaminda, F. Nakajima, H. Furumai

    WATER SCIENCE AND TECHNOLOGY   58 ( 6 )   1207 - 1213   2008

     More details

    Language:English   Publisher:IWA PUBLISHING  

    The size distributions of zinc and copper species in the effluent of a wastewater treatment plant were determined by a combination of ultrafiltration and chelating disk cartridge fractionation. The results showed that 75-87% of total Zn and 84-86% of total Cu were strongly complexed or particle-bound in the final effluents. It was also found that the major part of Cu was bound to ligands in the &lt; 500 Da fraction while the trend for Zn was not so clear and exhibited significant seasonal variability. Labile Cu and Zn were detected not only in the smallest fraction (&lt; 500 Da) but also in the larger fractions. It meant that the labile species in the effluent were not equivalent to free metal ions. Conditional stability constants and ligand concentrations were also determined from the measured metal concentrations by square wave anodic stripping voltammetry. Existence of two types of ligand for each metal was inferred from the experimental data. Conditional stability constant obtained for the stronger type Ligand of Zn was higher than that of Cu, although the estimated Ligand concentrations were almost similar.

    DOI: 10.2166/wst.2008.480

    Web of Science

    PubMed

    researchmap

  • Anaerobic Organic Matter Uptake by Phosphate-Accumulating Organisms in Activated Sludge Treating Municipal Wastewater Supplemented with Laundry Detergent

    TSUJI Koji, FUJITA Masafumi, FURUMAI Hiroaki, SAKAMOTO Yasushi

    Japan journal of water pollution research   31 ( 12 )   755 - 762   2008

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    An anaerobic aerobic sequencing batch reactor was operated for 185 days using municipal wastewater supplemented with a laundry detergent including LAS and AE to examine the efficiency of acetate uptake and the availability of the surfactants as a potential PHA source of PAOs under exposure to the detergent. Over the experimental period, the phosphate requirement for acetate uptake (+ΔP/-ΔAc ratio) was estimated by an anaerobic batch test with the addition of acetate. Consequently, it was found that the exposure to the detergent deteriorated the acetate uptake efficiency of PAOs. On the other hand, even though the detergent was added as a sole carbon source in the anaerobic batch test, a significant phosphate release was observed. The organic matter originating from the detergent was then divided into acetate and other organics, and their contributions to phosphate release were estimated using activated sludge collected on the 185th day. 60% of the total released phosphate was caused by the uptake of degradation products of LAS except lower fatty acids such as acetate. Comparing the maximum amounts of released phosphate between the two anaerobic batch tests in which acetate and the detergent were used, the latter was beyond the former after the start of the detergent addition. That is, PAOs that can not utilize acetate but can utilize degradation products of LAS contributed to phosphate removal gradually.

    DOI: 10.2965/jswe.31.755

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00323815015?from=CiNii

  • 水道原水の水質類型と総合汚濁指標に関する研究

    林野, 横田治雄, 古米弘明, 藤原正弘

    水道協会雑誌   177 ( 11 )   15 - 24   2008

     More details

  • Toxicity Characterization of Urban River Sediments Using Bioassay with Ostracod

    WATANABE Haruna, NAKAJIMA Fumiyuki, KASUGA Ikuro, FURUMAI Hiroaki

    Japan journal of water pollution research   31 ( 11 )   671 - 676   2008

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    To protect the aquatic ecosystem, it is important to evaluate the toxicity of contaminated sediments. Moreover, the identification of chemical compounds responsible for the toxicity is needed for effective remediation. In this study, we aimed to identify the principal toxicants of urban river sediments, applying Toxicity Identification Evaluation (TIE) methods to the toxicity test with an ostracod (a benthic crustacean). The toxicity test was conducted using sediments amended with three adsorbents: Zeolite, Chelex-100 and Ambersorb-572. Four of the nine urban river sediment samples showed lethal toxicity to the ostracod, but none of the three adsorbents reduced the mortality of the ostracod. Growth inhibition was observed in all the samples; however, the addition of the carbonaceous adsorbent Ambersorb-572 suppressed the growth inhibition in the 6 samples. This indicates that hydrophobic substances in the sediments inhibit the growth of the ostracod.

    DOI: 10.2965/jswe.31.671

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00322258455?from=CiNii

  • RNA arbitrarily primed PCR(RAP‐PCR)法による活性汚泥微生物群の遺伝子発現解析の試み

    高橋仁, 栗栖太, 春日郁朗, 古米弘明

    環境工学研究フォーラム講演集   44th   60 - 62   2007.11

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • ランダムゲノムライブラリを用いたアイソトープアレイによる基質特異的な細菌の検出

    飛野智宏, 栗栖太, 春日郁朗, 古米弘明

    環境工学研究フォーラム講演集   44th   230 - 232   2007.11

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 3-23 水溶性切削油廃液処理プロセスからの好気好熱性ジシクロヘキシルアミン分解細菌の分離(水処理生態系,口頭発表)

    馮 欣, 栗栖 太, 春日 郁朗, 古米 弘明

    日本微生物生態学会講演要旨集   0 ( 23 )   2007.9

     More details

    Language:Japanese   Publisher:日本微生物生態学会  

    researchmap

  • Diversity of catechol 2,3-dioxygenase genes of bacteria responding to dissolved organic matter derived from different sources in a eutrophic lake

    Ikuro Kasuga, Fumiyuki Nakajima, Hiroaki Furumai

    FEMS MICROBIOLOGY ECOLOGY   61 ( 3 )   449 - 458   2007.9

     More details

    Language:English   Publisher:BLACKWELL PUBLISHING  

    Catechol 2,3-dioxygenase (C23O) is an extradiol dioxygenase that plays an important role in degrading aromatic compounds such as those found at polluted sites. However, little is known about the diversity of C23O genes in unpolluted environments. In such environments, various factors, including the quality and quantity of dissolved organic matter (DOM), could influence the composition and behaviour of bacterial community possessing C230 genes. We investigated C23O genes in bacteria responding to DOM from various sources in a eutrophic lake by PCR and cloning. Six microcosms filled with lake water containing indigenous bacteria and DOM from different sources were incubated for 10 days. After 1 or 2 days of incubation, C23O genes were detected in the microcosms enriched with DOM recovered from inflow river water and humus from reed grass. The sequences were very diverse but had features conserved in extradiol dioxygenases. The clone libraries generated on day 2 showed distinctive compositions among microcosms, indicating that bacteria possessing a variety of C23O genes responded differently to DOM from different sources. After 10 days of incubation, C23O genes in a previously unidentified gene cluster, 'Cluster X', became dominant in the libraries.

    DOI: 10.1111/j.1574-6941.2007.00347.x

    Web of Science

    researchmap

  • Modeling of runoff behaviour of particle-bound polycyclic aromatic hydrocarbons (PAHs) from roads and roofs

    30 ( 8 )   426 - 426   2007.8

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • Development of a 60-mer oligonucleotide microarray on the basis of benzene monooxygenase gene diversity

    Shoko Iwai, Futoshi Kurisu, Hidetoshi Urakawa, Osami Yagi, Hiroaki Furumai

    APPLIED MICROBIOLOGY AND BIOTECHNOLOGY   75 ( 4 )   929 - 939   2007.6

     More details

    Language:English   Publisher:SPRINGER  

    We constructed a 60-mer oligonucleotide microarray on the basis of benzene monooxygenase gene diversity to develop a new technology for simultaneous detection of the functional gene diversity in environmental samples. The diversity of the monooxygenase genes associated with benzene degradation was characterized. A new polymerase chain reaction (PCR) primer set was designed using conserved regions of benzene monooxygenase gene (BO12 primer) and used for PCR-clone library analysis along with a previously designed RDEG primer which targeted the different types of benzene monooxygenase gene. We obtained 20 types of amino acid sequences with the BO12 primer and 40 with the RDEG primer. Phylogenetic analysis of the sequences obtained suggested the large diversity of the benzene monooxygenase genes. A total of 87 60-mer probes specific for each operational taxonomical unit were designed and spotted on a microarray. When genomic DNAs of single strains were used in microarray hybridization assays, corresponding sequences were successfully detected by the microarray without any false-negative signals. Hybridization with soil DNA samples showed that the microarray was able to detect sequences that were not detected in clone libraries. Constructed microarray can be a useful tool for characterizing monooxygenase gene diversity in benzene degradation.

    DOI: 10.1007/s00253-007-0877-0

    Web of Science

    PubMed

    researchmap

  • Identification of particles containing chromium and lead in road dust and soakaway sediment by electron probe microanalyser

    Michio Murakami, Fumiyuki Nakajima, Hiroaki Furumai, Bunbunoshin Tomiyasu, Masanori Owari

    CHEMOSPHERE   67 ( 10 )   2000 - 2010   2007.5

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Individual particles containing Cr and/or Pb and other major components were identified in road dust from a heavily used road (hereinafter 'heavy traffic road dust'), road dust from a residential area and soakaway sediment by electron probe microanalyser to locate their sources and carrier particles. Individual particles containing high levels of Cr and/or Pb (&gt;=-0.2%) were identified using wavelength dispersive spectrometry (WDS) map analysis. Chromium, Pb and other major elements were then determined by means of a combination of WDS and energy-dispersive spectrometry in all identified particles, 50 particles containing neither Cr nor Pb from each type of road dust and soakaway sediment, and yellow road line markings. WDS map analysis revealed that many particles containing both Cr and Pb were present among the identified particles in heavy traffic road dust, whereas they were minor components in road dust from the residential area and soakaway sediment. The plots of X-ray intensities of Cr vs. Pb were linear for the identified particles containing both Cr and Pb in heavy traffic road dust, and the line closely fitted the plots for the three yellow road line marking samples. Individual particles were then classified using cluster analysis of element components. The results revealed that the adsorption of source materials or released metals onto soil minerals occurred in road dust and soakaway sediment, that the yellow road line markings were sources of Cr and Pb in heavy traffic road dust, and that materials containing Fe as a major component, such as stainless steel, were additional sources of Cr in both road dust and soakaway sediment. (c) 2006 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.chemosphere.2006.11.044

    Web of Science

    PubMed

    researchmap

  • Countermeasure Technologies for Urban Non-point Pollution and their Applications

    FURUMAI Hiroaki

    Journal of Japan Society on Water Environment   30 ( 4 )   172 - 175   2007.4

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • 雨水浸透桝における道路排水中の形態別重金属の吸脱着特性の解析

    藤田誠, 村上道夫, 春日郁朗, 栗栖太, 古米弘明

    日本水環境学会年会講演集   41st   9   2007.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 16S‐23S rDNAスペーサー領域配列を用いたJanibacter terrae近縁株の特異的検出とダイオキシン類分解能の評価

    高橋亮介, 栗栖太, 春日郁朗, 岩井祥子, 古米弘明, 矢木修身

    日本水環境学会年会講演集   41st   50   2007.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • マイクロアレイによる土壌中ベンゼン酸化酵素遺伝子の網羅的検出

    岩井祥子, 栗栖太, 春日郁朗, 古米弘明, 浦川秀敏, 矢木修身

    日本水環境学会年会講演集   41st   54   2007.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • クロロエチレン類脱塩素化集積培養系の脱塩素化活性に及ぼす酸化還元電位の影響

    和田健男, 栗栖太, 春日郁朗, 矢木修身, 古米弘明

    日本水環境学会年会講演集   41st   165   2007.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 多摩川における微細有機物の動態に及ぼす下水処理水流入及び河川構造物の影響

    細見暁彦, 春日郁朗, 栗栖太, 古米弘明

    日本水環境学会年会講演集   41st   346   2007.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • Water-soluble organic micro-pollutants in municipal wastewater and their removal during advanced treatment

    Shinohara H, Tanishima T, Kojima S, Managaki S, Takada H, Nakada N, Tanaka H, Nakajima F, Furumai H

    Southeast Water Environment 2   311 - 318   2007

     More details

  • Diurnal Behavior of LAS in Domestic Wastewater from Residential District on Fine-Weather Day

    TSUJI Koji, FUJITA Masafumi, KIM WeonJae, MANAGAKI Satoshi, NAKAJIMA Fumiyuki, FURUMAI Hiroaki

    Japan journal of water pollution research   30 ( 10 )   579 - 583   2007

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    To investigate the diurnal behavior of linear alkylbenzene sulphonates (LAS) in domestic wastewater from a residential district on a fine-weather day, wastewater was collected for 24 hours from an upper part of a combined sewer. Dissolved LAS (D-LAS) concentration and loading began to increase from early morning and reached the highest values at 9:00. Then, they gradually decreased until noon. Multi-dimensional scaling (MDS) analysis using total LAS (T-LAS) composition showed that around the peak time wastewater was largely derived from laundry. On the other hand, there were significant shifts in D-LAS concentration and loading as well as T-LAS composition on the MDS map from 12:00 to 0:00. Therefore, LAS discharge showed a marked diurnal change. In the above investigation, the LAS adsorbed onto SS (A-LAS) and the D-LAS that is commonly analyzed were assayed. As a consequence, the former occupied larger fraction than the latter. Additionally, A-LAS composition differed from D-LAS composition, because C13-LAS was predominant in A-LAS, whereas C11-LAS was dominated in D-LAS. From the results, it was found that using the T-LAS obtained by analyzing A-LAS as well as D-LAS was desirable, for example, to assess the environmental pollution risk caused by combined sewer overflow. Moreover, the amount of LAS discharged from household per person per day was estimated at 1.2 g · p.e-1 · day-1 by taking notice of T-LAS.

    DOI: 10.2965/jswe.30.579

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00301926016?from=CiNii

  • 上流管路の水質を時系列入力情報とした合流改善のためのオンライン負荷量予測モデルの検討,

    長岩明弘

    用水と廃水   49 ( 6 )   487 - 494   2007

     More details

  • Distribution of Mutagen Formation Potential in Nationwide River Waters in Japan and Relationship with General Water Quality or River Basin Characteristics

    KOMATSU Toshiya, MANABE Yoshiaki, HIMENO Shuji, HARADA Arata, MURAKAMI Michio, FURUMAI Hiroaki

    Japan journal of water pollution research   30 ( 8 )   433 - 440   2007

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    We measured the mutagen formation potential (MFP) of 42 river water samples from 37 rivers throughout Japan using the Ames mutagenicity assay, to investigate the nationwide level of mutagen precursors contained in river water. The MFP of river water was highest when Salmonella typhimurium strain TA100 was used without metabolic activation. The MFPs ranged from 210 to 20,200 net rev. · l-1 and the median was 2,520 net rev. · l-1, which shows that the values varied greatly between samples. About 60% of the samples showed MFPs in the range from 1,500 to 3,500 net rev. · l-1. Dissolved organic carbon (DOC), E260, NH4-N, NO2-N, NO3-N and T-N concentrations were also measured. A strong positive relationship was observed between logarithmically-transformed DOC and MFP. However, the MFP/DOC ratio varied widely from 110 to 2,160 net rev. · mg-1. We also investigated the relationship between MFP and river basin characteristics such as population density. The results suggest that mutagen precursors are strongly influenced by human activities. In addition, rivers were classified using a cluster analysis of water qualities (MFP, DOC, E260, NH4-N and NO2-N+NO3-N).

    DOI: 10.2965/jswe.30.433

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00299083135?from=CiNii

  • Calibration of ASM3 with enhanced biologcal phosphate removal module using response batch experiments

    Journal of water and waste   Vol.49 ( 3 )   222 - 230   2007

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • Multiple Evaluation of Soil Aquifer Treatment for Water Reclamation using Instrumental Analysis and Bioassay

    Southeast Water Environment 2   2007

     More details

  • Vertical distribution and speciation of heavy metals in stormwater infiltration facilities: possible heavy metals release to groundwater

    Water Practice & Technology   2 ( 2 )   on-line journal;http://www.iwaponline.com/wpt/002/wpt0020052.htm   2007

     More details

  • The role of inter-event time definition and recovery of initial/depression loss for the accuracy in quantitative simulations of highway runoff

    R. K. Aryal, H. Furumai, F. Nakajima, H. K. P. K. Jinadasa

    URBAN WATER JOURNAL   4 ( 1 )   53 - 58   2007

     More details

    Language:English   Publisher:TAYLOR & FRANCIS LTD  

    A long-term runoff monitoring was carried out in a highway drainage system in Winterthur, Switzerland. Several runoff quantity simulations were carried out using the distributed model 'InfoWorks-CS'. Serial rainfall monitoring data were used for investigation of water runoff behaviour from the highway. The inter-event time definition was calculated from the runoff simulation and applied for better accurate runoff volume determination. Under continuous rainfall condition, the quantity simulation showed a good agreement with the measured hydrograph. However, in some cases where rainfall was not continuous, overestimation of runoff volume and difference in peak height/timing was found after rainfall halting. It was believed that the initial/depression loss on road surface was recovered during the halting period of rainfall and caused the difference in the runoff volume and peak height/timing difference in simulation. The consideration of regenerated depression loss significantly improved runoff simulation results in the on-and-off type rainfall events. This result showed that it was essential to estimate the inter-event time definition to consider appropriateness of the initial or intermediate loss.

    DOI: 10.1080/15730620601145873

    Web of Science

    researchmap

  • 3-21 In situ identification of estrone-degrading microorganisms belonging to Betaproteobacteria in activated sludge(Waste water treatment ecosystem,Oral presentation) :

    Kaisai Zang, Kurisu Futoshi, Kasuga Ikuro, Furumai Hiroaki, Yagi Osami

    ( 23 )   73 - 73   2007

     More details

    Language:English  

    CiNii Books

    researchmap

  • 合流式下水道晴天時下水の時間負荷量変動特性の評価 (第44回下水道研究発表会講演集)

    金 元載, 古米 弘明, 真名垣 聡

    下水道研究発表会講演集   44   286 - 288   2007

     More details

    Language:Japanese   Publisher:日本下水道協会  

    CiNii Books

    researchmap

  • 水の循環系モデリングと利用システム リスク管理型都市水循環系の構造と機能の定量化 道路排水の浸透に伴う土壌中の重金属形態と土壌特性の変化

    HOSSAIN M. A, 古米弘明, 春日郁朗, 中島典之, 栗栖太

    研究領域「水の循環系モデリングと利用システム」第4回領域シンポジウム(平成14年度採択研究課題終了シンポジウム)講演要旨集 平成19年   92 - 93   2007

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 合流式下水道雨天時越流負荷制御のためのオンライン流量予測モデルの精緻化 (第44回下水道研究発表会講演集)

    長岩 明弘, 古米 弘明, 中島 典之

    下水道研究発表会講演集   44 ( 0 )   277 - 279   2007

     More details

    Language:Japanese   Publisher:日本下水道協会  

    researchmap

  • Heavy metals speciation in soakaways sediment and evaluation of metal retention properties of surrounding soil

    M. A. Hossain, H. Furumai, F. Nakajima, R. K. Aryal

    WATER SCIENCE AND TECHNOLOGY   56 ( 11 )   81 - 89   2007

     More details

    Language:English   Publisher:I W A PUBLISHING  

    Heavy metals speciation analysis was carried out on sediment samples accumulated within soakaways in an old stormwater infiltration facility in Tokyo, Japan and on a soil core sample collected near the facility. Heavy metals content in soakaways sediments were much elevated compared to nearby surface soil with the content for Zn, Pb and Cd reaching about 5 to 10 times the content in surface soil. Speciation results revealed that significant amount of the accumulated heavy metals were present in potential mobile fractions, posing threat of release to underlying soil with changing environmental conditions. Detail analyses of soil characteristics indicated significant heterogeneity with depth, especially between the surface soil and underlying soil at site. Decrease in potential adsorption sites with depth was observed in case of underlying soil. Reduced adsorption capacity for heavy metals was evidenced for underlying soil when compared with surface soil. Furthermore, less capability of the soil organic matter to bind heavy metals was evidenced through speciation analyses, which raises concern over the long-term pollution retention potential of the underlying soil receiving infiltrated runoff.

    DOI: 10.2166/wst.2007.746

    Web of Science

    researchmap

  • Identification of sewer pipes to be cleaned for reduction of CSO pollutant load

    Akihiro Nagaiwa, Katsushi Settsu, Fumiyuki Nakajima, Hiroaki Furumai

    WATER SCIENCE AND TECHNOLOGY   55 ( 4 )   75 - 83   2007

     More details

    Language:English   Publisher:IWA PUBLISHING  

    To reduce the CSO (Combined Sewer Overflow) pollutant discharge, one of the effective options is cleaning of sewer pipes before rainfall events. To maximize the efficiency, identification of pipes to be cleaned is necessary. In this study, we discussed the location of pipe deposit in dry weather in a combined sewer system using a distributed model and investigated the effect of pipe cleaning to reduce the pollutant load from the CSO. First we simulated the dry weather flow in a combined sewer system. The pipe deposit distribution in the network was estimated after 3 days of dry weather period. Several specific pipes with structural defect and upper end pipes tend to have an accumulation of deposit. Wet weather simulations were conducted with and without pipe cleaning in rainfall events with different patterns. The SS loads in CSO with and without the pipe cleaning were compared. The difference in the estimated loads was interpreted as the contribution of wash-off in the cleaned pipe. The effect of pipe cleaning on reduction of the CSO pollutant load was quantitatively evaluated (e.g. the cleaning of one specific pipe could reduce 22% of total CSO load). The CSO simulations containing pipe cleaning options revealed that identification of pipes with accumulated deposit using the distributed model is very useful and informative to evaluate the applicability of pipe cleaning option for CSO pollutant reduction.

    DOI: 10.2166/wst.2007.097

    Web of Science

    researchmap

  • C-02 Analysis of benzene oxygenase genes in soils using an oligonucleotide microarray(Bioremediation,(2)Oral presentation)

    Iwai Shoko, Kurisu Futoshi, Urakawa Hidetoshi, Yagi Osami, Furumai Hiroaki

    0 ( 22 )   2006.10

     More details

    Language:Japanese   Publisher:Japanese Society of Microbial Ecology  

    researchmap

  • 土壌中のベンゼン酸化酵素遺伝子解析を目的としたマイクロアレイの開発

    岩井祥子, 栗栖太, 古米弘明, 浦川秀敏, 矢木修身

    日本水環境学会シンポジウム講演集   9th   31 - 32   2006.9

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 変革期を迎えた下水道による雨水対策

    古米 弘明

    下水道協会誌   43 ( 524 )   1 - 1   2006.6

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • 安定同位体プローブ法と平板培養法による土壌中の17β‐エストラジオール(E2)分解微生物の探索と土壌のE2分解力の評価

    坂田佳子, 栗栖太, 矢木修身, 古米弘明

    日本水環境学会年会講演集   40th   254   2006.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • EVALUATION OF THE ACTIVITY LOCATIONAL PATTERN BASED ON THE WATER SUPPLY FOOTPRINT INDEX-CONSIDERATION OF WATER BALANCE FOR LOCAL PLANNING-:CONSIDERATION OF WATER BALANCE FOR LOCAL PLANNING

    UJIHARA Takehito, TANIGUCHI Mamoru, FURUMAI Hiroaki, ONO Yoshiro

    Doboku Gakkai Ronbunshuu G   34   507 - 513   2006

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    This study clarifies the relation between activity location and groundwater infiltration. A new index (water supply footprint index: WSFP) is introduced to evaluate area-based self-sufficiency of water supply by use of groundwater infiltration. Four areas with different planning conditions are designated for case studies. For present conditions, the WSFP in the planned area is higher than that of the unplanned area with farmlands. However, results show that efficiencies of improvement, by introducing a watersupply network or new facilities for infiltration, are high in the planned area than in unplanned area.

    DOI: 10.2208/proer.34.507

    researchmap

  • Relative Evaluation of Reclaimed Wastewater in Urban Area in Comparison with the Distribution of River Water Quality

    HARADA Arata, NAKADA Norihide, YAMASHITA Naoyuki, SATO Nobuyuki, ITO Mitsuaki, SUZUKI Yutaka, TANAKA Hiroaki, FURUMAI Hiroaki

    Doboku Gakkai Ronbunshuu G   43   507 - 513   2006

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    Recently, it is expected to utilize reclaimed wastewater water for a new water source in urban areas. However, adequate assessment about the relative risk and the acceptance of the reclaimed wastewater should be conducted from the viewpoint of water usage. In this study, we relatively evaluated the quality of reclaimed wastewater in comparison with a "criterion" based on nationwide distribution of river water quality.<BR>At first, we selected 36 rivers with various sizes of the river basin area from all over Japan. Then, after we analyzed and collected various chemical and biological items of water quality of each river, those in the selected rivers were manipulated in the form of non-exceeding probability. The probability results were similar in key water quality items to those of all the major rivers in Japan, which suggest that the distributions of water quality items based on the selected rivers can represent all the major rivers in Japan.<BR>Next, we compared the water qualities of secondary effluent and reclaimed wastewaters treated with sand filter, ozone and soil aquifer, with the distribution of water quality of the selected rivers. For an example, estrogen-like activity of secondary effluent equivalent to over the 90th percentile of the rivers decreased to about the 40th percentile of the rivers that is medium quality level through the ozonization process or the soil aquifer treatment. The other water quality items except nitrogens were also greatly improved by the above processes to the same way.

    DOI: 10.11532/proes1992.43.501

    researchmap

  • Speciation of zinc, copper and nickel in domestic wastewater treatment process and in receiving river water

    ISOZAKI Yuichi, NAKAJIMA Fumiyuki, FURUMAI Hiroaki

    Environmental science   19 ( 5 )   445 - 452   2006

     More details

  • Accumulation of heavy metals in road dust and infiltration inlet sediment

    MURAKAMI Michio, NAKAJIMA Fumiyuki, FURUMAI Hiroaki, ARYAL Rupak K.

    Environmental science   19 ( 5 )   453 - 460   2006

     More details

  • Pollutant flow in urban water cycle and sustainable water use

    FURUMAI Hiroaki

    ENVIRONMENTAL SCIENCE   19 ( 5 )   425 - 434   2006

     More details

    Language:Japanese   Publisher:SOCIETY OF ENVIRONMENTAL SCIENCE, JAPAN  

    DOI: 10.11353/sesj1988.19.425

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00285803457?from=CiNii

  • Various particulate organic matter (POM) supporting stream ecosystems. Ecol. Civil Eng. 9(1), 85-101, 2006

    Chihiro Yoshimura, Kazumi Tanida, Hiroaki Furumai, Fumiyuki Nakajima

    Ecology and Civil Engineering   9 ( 1 )   85 - 101   2006

     More details

    Language:English  

    In streams, particulate organic matter (POM) serves as a pivotal link between dissolved nutrients, microbes and organisms at higher trophic levels. Especially in forested streams, such linkage with allochthonous POM is fundamental for saprophytic chain of stream ecosystems. Here, we reviewed current understanding of riverine POM by focusing its classification, dynamics, and ecological role in streams. Generally, coarse particulate organic matter (CPOM, &gt
    1 mm) is broken down to fine particulate organic matter (FPOM, 0.45 μm-1mm) and dissolved organic matter (DOM, &lt
    0.45μm) while providing essential energy and nutrients for microbes and aquatic fauna. Since input and transport of POM depend highly on season and discharge fluctuation, POM concentration in temperate streams shows wide ranges: 0.001 to 3 mgC L-1 for CPOM and 0.05 to 1 mgC L-1 for FPOM. For deposited POM density, channel unit such as riffle and pool is also influential. Major ecological roles of riverine POM are 1) habitat for aquatic fauna, 2) energy and nutrient supply for microbes, 3) energy and nutrient supply for aquatic fauna, and 4) material transport to downstream reaches and ocean. Colonization of fungi and bacteria on POM mediates carbon and nutrient uptake of aquatic fauna, especially macroinvertebrates. In stream ecosystems, therefore, POM is a major driving force and repeatedly experiences biological interaction and transformation, which is referred as organic matter spiraling. Thus, understanding of organic matter dynamics and its biological interaction is essential for conservation and restoration of stream ecosystems. © 2006, Ecology and Civil Engineering Society. All rights reserved.

    DOI: 10.3825/ece.9.85

    Scopus

    researchmap

  • DYNAMICS OF FINE BENTHIC ORGANIC MATTER AND ITS EFFECT ON COMMUNITY STRUCTURE OF BENTHIC INVERTEBRATES IN TAMA RIBER

    HOSOMI Akihiko, YOSHIMURA Chihiro, NAKAJIMA Fumiyuki, FURUMAI Hiroaki

    VII-38(811) ( 811 )   37 - 47   2006

     More details

  • Prolonged deposition of heavy metals in infiltration facilities and its possible threat to groundwater contamination

    R. K. Aryal, M. Murakami, H. Furumai, F. Nakajima, H. K. P. K. Jinadasa

    WATER SCIENCE AND TECHNOLOGY   54 ( 6-7 )   205 - 212   2006

     More details

    Language:English   Publisher:IWA PUBLISHING  

    A field investigation of infiltration facilities, built two decades ago in Tokyo, was carried out and sediment samples were collected from 12 infiltration inlets of three different locations. Heavy metals contents in the inlet sediment, road dusts and soils samples were analysed and compared. The particle size distribution analysis showed its variation in depth as well as from inlet to inlet. The nature of organic substances present in sediment found changes in particle sizes as well as in depth. The heavy metals content in the sediment samples ranged from 6-143 (Cr), 1-84 (Ni), 49-331 (Cu), 210-2186 (Zn) and 2-332 (Pb) mu g/g. The heavy metal content ranges were similar to road dust, which indicated road dust as a possible source for sediment for the infiltration inlets. The lower heavy metals content in many sediment samples than the soil indicated possible release/desorption of heavy metals under newly created environments such as an anaerobic environment. Among the heavy metals there was a relatively good relationship between Cu and Zn, indicating the existence of their common sources.

    DOI: 10.2166/wst.2006.584

    Web of Science

    researchmap

  • Transfer of hydrophobic contaminants in urban runoff particles to benthic organisms estimated by an in vitro bioaccessibility test

    F. Nakajima, K. Saito, Y. Isozaki, H. Furumai, A. M. Christensen, A. Baun, A. Ledin, P. S. Mikkelsen

    WATER SCIENCE AND TECHNOLOGY   54 ( 6-7 )   323 - 330   2006

     More details

    Language:English   Publisher:I W A PUBLISHING  

    An in vitro bioaccessibility test was applied for assessing the transfer of polycyclic aromatic hydrocarbons (PAHs) present in road dust, into benthic organisms living in a receiving water body. The road dust is supposed to be urban runoff particles under wet weather conditions. Sodium dodecyl sulfate (SDS) solution was used as a hypothetical gut fluid. Pyrene, fluoranthene and phenanthrene were the main PAH species in the SIDS extractable fraction of road dust, as well as the whole extract. Benzo(ghi)perylene showed relatively low concentrations in the SIDS extract in spite of a high concentration in the original dust. The PAH composition in benthic organisms (polychaetes) did not correspond with that of the surrounding sediment and the PAHs detected were also detected in high concentrations in the SDS extract of road dust. When testing the toxicity of the extracted contaminants by a standardised algal toxicity test, SIDS extracts of a detention pond sediment showed higher toxicity than the pore water of the corresponding sediment. Sediment suspension showed a comparative toxicity with 0.1% SIDS extract. From the results, the in vitro bioaccessibility test seems more suitable to evaluate the exposed contaminants than the traditional organic solvent extraction method and the SDS extracted fraction is applicable to toxicity tests reflecting the digestive process.

    DOI: 10.2166/wst.2006.583

    Web of Science

    researchmap

  • Uptake of Organic Matter by EBPR Activated Sludge under Exposure of Surfactant in Anaerobic Condition

    TSUJI Koji, FUJITA Masafumi, FURUMAI Hiroaki

    Doboku Gakkai Ronbunshuu G   43   333 - 342   2006

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    Firstly, phosphate release activity test in which commercial laundry detergents and LAS were added to an actual anaerobic aerobic activated sludge showed the increase of phosphate concentration and PHA content, and subsequent phosphate uptake activity test exhibited the remarkable decrease of phosphate concentration. Therefore, surfactant was likely to be finally accumulated as PHA. Secondly, the adsorption amount of LAS to actual anaerobic aerobic activated sludge in anaerobic tank as well as a daily change in LAS concentration of influent wastewater were examined, so that the adsorption amount of LAS in a lab activated sludge which has never been exposed by any surfactant was adjusted to the actual level by adding detergent including LAS and AE, and sole LAS. Finally, phosphate release test was conducted using the adjusted activated sludge to investigate the effect of sutfactant on acetate uptake by polyphosphate-accumulating organisms. The addition of the detergent hought the increase of acetate uptake rate and the decrease of +ΔP/-ΔAc value. On the other hand, the addition ofthe sole LAS caused respective opposite effects. In other words, LAS decreased acetate uptake rate and its energy efficiency, while AE would increase them.

    DOI: 10.11532/proes1992.43.333

    researchmap

  • Water-soluble organic micro-pollutants in municipal wastewater and their removal during advanced treatment

    Southeast Water Environment 2   2006

     More details

  • Characteristics of particle-associated PAHs in a first flush of a highway runoff

    RK Aryal, H Furumai, F Nakajima, M Boller

    WATER SCIENCE AND TECHNOLOGY   53 ( 2 )   245 - 251   2006

     More details

    Language:English   Publisher:I W A PUBLISHING  

    Runoff monitoring of six rainfall events was carried out in a highway, Winterthur, Switzerland focusing on first flush (runoff volume up to 2.88 mm). Six runoff events were used to investigate the characteristics of particle-associated PAHs in first flush. The fine fraction (&lt; 45 mu m) had a relatively higher contribution than the coarse fraction. A significant contribution of the coarse fraction was observed at some periods when the runoff flow rapidly increased. Fluctuation of PAH content during a runoff event was significant in the coarse fraction and, in contrast, the PAH content in the fine fraction was less fluctuating. The weighted average PAH content in each event ranged from 17 to 62 mu g/g in total SS, from 23 to 54 mu g/g in the fine fraction and from 16 to 84 mu g/g in the coarse fraction. The loading of particle-associated PAHs from the first flush of highway runoff ranged from 0.06 to 0.22 g/ha in a total of 12 PAH species.

    DOI: 10.2166/wst.2006.058

    Web of Science

    PubMed

    researchmap

  • 界面活性剤の流入変動とリン放出過程に係わるモデルパラメータとの関係 (第43回下水道研究発表会講演集)

    辻 幸志, 藤田 昌史, 古米 弘明

    下水道研究発表会講演集   43   103 - 105   2006

     More details

    Language:Japanese   Publisher:日本下水道協会  

    CiNii Books

    researchmap

  • 時系列水質情報を用いた合流改善のためのオンライン負荷量予測モデルの構築 (第43回下水道研究発表会講演集)

    長岩 明弘, 古米 弘明, 中島 典之

    下水道研究発表会講演集   43   311 - 313   2006

     More details

    Language:Japanese   Publisher:日本下水道協会  

    CiNii Books

    researchmap

  • Adsorption test of semi-volatile di-(2-ethylhexyl) phthalate in coagulation and flocculation processes with/without bubble in closed jar tester

    Y. Thaveemaitree, F. Nakajima, H. Furumai, S. Kunikane

    5th World Water Congress: Drinking Water Treatment Processes   6 ( 3 )   9 - 16   2006

     More details

    Language:English   Publisher:I W A PUBLISHING  

    Di-(2-ethylhexyl) phthalate (DEHP) is widely used and abundantly exists in the environment. Due to fresh water contamination, DEHP can enter drinking water treatment and be adsorbed on solid floc generated mostly from coagulation and flocculation processes. This study aimed to quantify the distribution of DEHP in liquid/solids (floating scum, suspended solids and settled sludge) after coagulation and flocculation processes with/without bubble. For this purpose, we developed a closed jar tester to prevent DEHP volatilization and contamination from the laboratory environment. According to DEHP adsorption results, the aluminium coagulant is an important factor for DEHP adsorption and the floating solid contained more DEHP than the settled solid. 60-72% of initial DEHP was found in solid under conditions with aluminium coagulant, whereas 3-5% of initial DEHP was found in solid under the condition without coagulant. When the bubble presented, DEHP concentration in the solids in the top and middle layers increased. The 55 minutes of operation time (coagulant, flocculation and settling processes) was not long enough to achieve the equilibrium of DEHP adsorption especially in the cases with coagulant.

    DOI: 10.2166/ws.2006.705

    Web of Science

    researchmap

  • Leaching Characteristics of Heavy Metals in Road Dust in Tokyo

    MURAKAMI Michio, NAKAJIMA Fumiyuki, FURUMAI Hiroaki, KATO Yuji

    Japan journal of water pollution research   29(11) ( 11 )   713 - 735   2006

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    Leaching tests on road dust are necessary to clarify the transport of heavy metals in water cycle in urban areas. In this study, leaching tests were conducted to evaluate the leaching characteristics of heavy metals from road dust in a heavy-traffic area and in a residential area. The results show that the leached concentrations of Cr, Fe, Ni and Cu from road dust in the heavy-traffic area were significantly higher than those from road dust in the residential area. Additionally, the leached fractions of Cr from road dust in the heavy-traffic area were also significantly larger than those from road dust in the residential area. The leached fractions of Cr from road dust seem to be derived from traffic sign markers such as yellow paint. Leaching tests on size-fractionated road dust revealed that the leached concentrations of Al, Cr, Cu, As and Cd were higher in their fine fractions (< 106 μm), whereas the leached concentrations of Mn, Zn and Pb were higher in their coarse fractions (106∼2000 μm). There were different tendencies in leaching characteristics from fine to coarse fractions among the heavy metals.

    DOI: 10.2965/jswe.29.731

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00288086352?from=CiNii

  • Dynamic behavior of fractional suspended solids and particle-bound polycyclic aromatic hydrocarbons in highway runoff

    RK Aryal, H Furumai, F Nakajima, M Boller

    WATER RESEARCH   39 ( 20 )   5126 - 5134   2005.12

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    A long-term continuous runoff monitoring was carried out in a highway in Winterthur, Switzerland. The total suspended solids (TSS) samples were fractionated into fine (&lt; 45 mu m) and coarse (&gt; 45 mu m) fraction and their washoff behavior was studied. The fine and coarse fraction showed different washoff behaviors. During the runoff the concentration of the fine fraction was less fluctuated compared to coarse. The fluctuation of the coarse fraction was more influenced by TSS concentration. The PAH content measurement in fine fraction showed less fluctuation compared to the coarse fraction. The PAH content in the coarse fraction was found decreasing with increasing the coarse fraction contribution to TSS. (c) 2005 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.watres.2005.09.045

    Web of Science

    PubMed

    researchmap

  • Size- and density-distributions and sources of polycyclic aromatic hydrocarbons in urban road dust

    M Murakami, F Nakajima, H Furumai

    CHEMOSPHERE   61 ( 6 )   783 - 791   2005.11

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Polycyclic aromatic hydrocarbons (PAHs) present in size- and density-fractionated road dust were measured to identify the important fractions in urban runoff and to analyse their sources. Road dust was collected from a residential area (Shakujii) and a heavy traffic area (Hongo Street). The sampling of road dust from the residential area was conducted twice in different seasons (autumn and winter). The collected road dust was separated into three or four size-fractions and further fractionated into light (&lt; 1.7 g/cm(3)) and heavy (&gt; 1.7 g/cm(3)) fractions by using cesium chloride solution. Light particles constituted only 4.0 +/- 1.4%, 0.69 +/- 0.03% and 3.4 +/- 1.0% of the road dust by weight for Shakujii (November), Shakujii (February) and Hongo Street, respectively but contained 28 +/- 10%, 33 +/- 3% and 44 +/- 8% of the total PAHs, respectively. The PAH contents in the light fractions were 1-2 orders of magnitude higher than those in the heavy fractions. In the light fractions, the 12PAH contents in February were significantly higher than the 12PAH contents in November (P &lt; 0.01), whereas in the heavy fractions, no significant difference was found (P &gt; 0.05). Cluster analysis revealed that there was a significant difference in the PAH profiles between locations rather than between size-fractions, density-fractions and sampling times. Multiple regression analysis indicated that asphalt/pavement was the major source of Shakujii road dust, and that tyre and diesel vehicle exhaust were the major sources of finer and coarser fractions collected from Hongo Street road dust, respectively. (c) 2005 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.chemosphere.2005.04.003

    Web of Science

    PubMed

    researchmap

  • PB-16 17β-estradiol degradation and microbial community analysis in soil(MICROBL COMMUNITY ANALYSIS,Session B,(1) Poster presentations)

    Sakata Yoshiko, Kurisu Futoshi, Yagi Osami, Furumai Hiroaki

    0 ( 21 )   2005.10

     More details

    Language:Japanese   Publisher:Japanese Society of Microbial Ecology  

    researchmap

  • 健全な流域水循環系と都市の持続的水利用 (特集 安心・持続と環境共生技術)

    古米 弘明

    ケミカルエンジニヤリング   50 ( 10 )   791 - 796   2005.10

     More details

    Language:Japanese   Publisher:化学工業社  

    CiNii Books

    researchmap

  • Vision of Sustainable Water Use and Supply

    FURUMAI Hiroaki

    74 ( 8 )   1 - 1   2005.8

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • Characterization of dissolved organic matter (DOM) removed by iron coagulation using spectrofluorimetry and pyrolysis GC/MS analysis

    K Komatsu, F Nakajima, H Furumai, O Miki

    JOURNAL OF WATER SUPPLY RESEARCH AND TECHNOLOGY-AQUA   54 ( 3 )   157 - 163   2005.5

     More details

    Language:English   Publisher:I W A PUBLISHING  

    In this study, coagulation experiments were conducted using three coagulants (ferric chloride (FC), poly ferric sulfate (PFS) and poly aluminum chloride (PAC)) to evaluate DOM (dissolved organic matter) removal performance in lake water. DOM removal was characterized not only by comprehensive indices such as dissolved organic carbon (DOC) and UV absorbance at 260nm (UVA(260)) but also by spectrofluorimetry and pyrolysis gas chromatography/mass spectrometry (py-GC/MS) analysis, which are useful techniques to obtain information on the structure of a higher percentage of DOC was removed by ferric coagulants than by the aluminum coagulant (FC: 53%, PFS: 41%, PAC: 36%). Similar trends were observed in the coagulation-induced decrease of UVA(260) and trihalomethane formation potential (THMFP). Spectrofluorimetry showed that higher concentrations of coagulant increased the removal of DOM with fluorescence components. However, fluorescence intensity was not reduced by increased coagulant concentrations at emission wavelengths shorter than 350 nm. Treatments with ferric coagulants were more effective in removing fluorescent components than PAC. Comparison of pyrochromatograms before and after coagulation revealed that the peak area of propanoic acid decreased most significantly after coagulation by FC among 16 identified fragment compounds. Four fragment compounds differed greatly in their coagulation behaviour, depending on the coagulant used.

    Web of Science

    researchmap

  • 消毒法の異なる下水処理水の土壌カラム通水試験における土壌微生物相への影響評価

    坂田佳子, 栗栖太, 矢木修身, 古米弘明

    日本水環境学会年会講演集   39th   522   2005.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • Present state of rivers and streams in Japan

    C Yoshimura, T Omura, H Furumai, K Tockner

    RIVER RESEARCH AND APPLICATIONS   21 ( 2-3 )   93 - 112   2005.2

     More details

    Language:English   Publisher:WILEY-BLACKWELL  

    The Japanese Archipelago (land area: 377 880 km 2) extends over a distance of c. 2000 kin, with a maximum width of 300 km. Geologically, it is a young and tectonically very active area. Japan is a mountainous, wet and forested country, with its people concentrated in densely populated urban areas along the coast and on alluvial plains. Rivers are short (max. length: 370 km), steep, and exhibit flashy flow regimes. The river regime coefficient ranges from 200 to 400, which is up to an order-of-magnitude, higher than that of most continental rivers. Japan has a rich freshwater fauna and flora with a high proportion of endemic species. A distinct latitudinal gradient (subarctic to subtropical climate) in combination with the radial character of the river network results in high spatial differentiation of the freshwater fauna.
    While water quality has improved remarkably during the past decades, Japanese rivers are still heavily impacted by canalization. loss of most dynamic flood plains, flow regulation, invasion by exotic species, and intensive urbanization. Currently 49% of the entire human population concentrates on 14% of the land, and the annual flood damage is the highest worldwide. As a consequence, major recent restoration initiatives aim to protect people and property against floods as well as simultaneously improving the ecological integrity of river ecosystems. Copyright (c) 2005 John Wiley & Sons, Ltd.

    DOI: 10.1002/rra.835

    Web of Science

    researchmap

  • Journal Prospect of Japan Society on Water Environment

    FURUMAI Hiroaki

    28 ( 1 )   11 - 12   2005.1

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • Clogging of infiltration inlets due to prolonged sediment deposition and its effect on heavy metals release (第42回下水道研究発表会講演集 平成17年度)

    古米 弘明, Aryal R. K., 村上 道夫

    下水道研究発表会講演集   42   375 - 377   2005

     More details

    Language:English   Publisher:日本下水道協会  

    CiNii Books

    researchmap

  • Model description of storage a rid infiltration functions of infiltration facilities for urban runoff analysis by a distributed model

    H Furumai, HKPK Jinadasa, M Murakami, F Nakajima, RK Aryal

    WATER SCIENCE AND TECHNOLOGY   52 ( 5 )   53 - 60   2005

     More details

    Language:English   Publisher:I W A PUBLISHING  

    Although there have been simulation researches focusing on reduction of stormwater peak flow, by introduced infiltration facilities, model simulation of dynamic runoff behavior is still limited for frequently occurring rainfall events with weak intensity. Therefore, dynamic simulation was carried out in two urban drainages with infiltration facilities incorporated with a distributed model using two methods for describing functions of infiltration facilities. A method adjusting effective rainfall model gave poor simulation of runoff behavior in light rainfalls. Another method considering dynamic change of storage capacity as well as infiltration rate gave satisfactory estimation of the runoff in both drainages. In addition, assumption of facility clogging improved the agreement between measured and simulated hydrographs in small and medium-sized rainfall. Therefore, the proposed method might be useful for quantifying the,secondary effects of the infiltration facilities on groundwater recharge and urban non-point, pollutant trapping. as well as runoff reduction.

    Web of Science

    researchmap

  • A long-term suspended solids runoff simulation in a highway drainage system

    RK Aryal, HKPK Jinadasa, H Furumai, F Nakajima

    WATER SCIENCE AND TECHNOLOGY   52 ( 5 )   159 - 167   2005

     More details

    Language:English   Publisher:I W A PUBLISHING  

    A long-term monitoring investigation was carried out in a highway drainage system in Winterthur, Switzerland. Several runoff quality and quantity simulations were carried out using the distributed model "InfoWorks-CS". Serial rainfall monitoring data was used for investigation of SS runoff. behavior from the highway. Under continuous rainfall conditions, the quantity simulation showed a good agreement with the measured hydrograph. However, in some cases where rainfall was not continuous, overestimation of the peak height was found at the later stage after the end of the rainfall. It was believed that the initial/depression loss on the road surface was recovered during the halting period of rainfall. The consideration of regenerated depression loss significantly improved runoff simulation results in the on-and-off type rainfall events. A single event quality simulation underestimated the SS load in light rainfall events. One of the reasons was possibly inadequate consideration of pipe sediment conditions. A long term simulation was carried out to establish the initial condition of surface and pipe sediment for the target event. The newly simulated pollutograph gave a good agreement with the measured one. It revealed that it was essential to consider appropriateness of the initial condition,of pipe sediment as well as surface sediment.

    Web of Science

    researchmap

  • Relationship between di-(2-ethylhexyl) phthalate concentration and chemical structure of organic matter on solids in drinking water treatment processes

    THAVEEMAITREE Y.

    Water Science & Technology: Water Supply   4 ( 5-6 )   321 - 333   2005

     More details

  • ポンプ場内の汚濁負荷挙動を考慮した越流水改善効果に関する研究

    下水道協会誌   42 ( 510 )   133 - 145   2005

     More details

  • 水道水源の保全と流域圏の管理

    水環境学会誌   28 ( 5 )   290 - 295   2005

     More details

  • Research Concerning Removal of Oil/Fat Scum by Storm Water Tank Systems

    YAMAZAKI Takeshi, MEGURO Toru, NAKAMURA Nagahide, FURUMAI Hiroaki, YOSHIMOTO Hideyuki

    Journal of Japan Sewage Works Association   42 ( 516 )   126 - 138   2005

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • 東京湾お台場海浜公園における雨天時合流式下水道越流水の影響調査

    鯉渕幸生

    海岸工学論文集   52   886 - 890   2005

  • Experimental Study on Pressure Distribution along Landward Slope of Coastal Dike Due to Tsunami Overflow

    Doboku Gakkai Ronbunshuu B   52   891 - 895   2005

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/proce1989.52.891

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00368607446?from=CiNii

  • EVALUATION OF NEIGHBORHOOD WATER ENVIRONMENT AND ITS MODELLING: TO REALIZE TOWN IMPROVEMENT BASED ON THE CONCEPT OF WATER RECYCLE

    TANIGUCHI Mamoru, FURUMAI Hiroaki, ONO Yoshiro, OKUBO Kenji, MOROIZUMI Toshitsugu

    Doboku Gakkai Ronbunshuu G   33   125 - 131   2005

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    The water environmet is one of the most important factors to indicate "Quality of Life" in neighborhood scale. This study aims to estimate the evaluation model for water environment based on the questionnaire survey in Okayama city. It is also examined that the evaluation reliability by residents for bio-chemical water quality in town stream. As the results, it is clarified that the certain amount of water flow is required to realize acceptable evaluation of water environment by neighbors. Contrarily, it is also found that higher water quality from bio-chemical points of view is not always necessary in town planning. The most significant political suggestion from the concept of water recycle is to utilize underground water resources that comes from sewage.

    DOI: 10.2208/proer.33.125

    researchmap

  • Sustainable urban wastewater management and reuse in Asia

    International Review for Environmental Strategies   5 ( 2 )   425 - 448   2005

     More details

  • Estimation of origins of polycyclic aromatic hydrocarbons in size-fractionated road dust in Tokyo with multivariate analysis

    P Pengchai, F Nakajima, H Furumai

    WATER SCIENCE AND TECHNOLOGY   51 ( 3-4 )   169 - 175   2005

     More details

    Language:English   Publisher:I W A PUBLISHING  

    This study aimed to estimate the origins of polycyclic aromatic hydrocarbons (PAHs) in size-fractionated road dust in Tokyo. First, seven categories of PAHs sources were defined: diesel vehicle exhaust, gasoline vehicle exhaust, tire, pavement, asphalt or bitumen, petroleum products excluding tire and asphalt, and combustion products except for those in vehicle engines. The 189 source data of 12-PAHs profiles were classified into 11 groups based on cluster analysis combined with principal component analysis. Next 18 road dust samples were collected from eight streets in Tokyo and fractionated into four different particle-size-fractions: 0.1-45, 45-106, 106-250, and 250-2,000 mu m. In order to estimate the contributions of the classified source groups (Si-S11) to PAHs in the road dust, multiple regression analysis was performed with 12-PAH profile of the road dust as dependent variable and average 12-PAHs profiles of the 11 source groups as 11 explanatory variables. Diesel vehicle exhaust, tire and pavement were the major contributors of PAHs in the fractionated road dust. Although the estimated contributions of the 11 source groups varied among the particle-size-fractions, there was no clear and consistent relationship between particle size and the major PAH contributor.

    Web of Science

    researchmap

  • 流域の持続的水循環をリスク管理から考える : 日本水環境学会, 水文・水資源学会合同シンポジウム

    古米 弘明

    水環境学会誌 = Journal of Japan Society on Water Environment   27 ( 12 )   779 - 780   2004.12

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • Modelling of runoff behaviour of particle-bound polycyclic aromatic hydrocarbons (PAHs) from roads and roofs

    M Murakami, F Nakajima, H Furumai

    WATER RESEARCH   38 ( 20 )   4475 - 4483   2004.12

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Road and roof dust was collected and samples of runoff were taken at an urban storm sewer system in a residential area in Japan. Suspended solids (SS) in the runoff samples were classified into two fractions: fine (smaller than 45 pm) and coarse (larger than 45 pm). Runoff monitoring and chemical analysis data were also used to validate a runoff model for particle-bound polycyclic aromatic hydrocarbons (PAHs) that was originally developed to explain the behaviour of SS in the same area. The model, in which roads and roofs were considered separately as impervious surfaces, expressed the SS and particle-bound PAHs runoff behaviour for fine and coarse particles very well, except during and after heavy rainfalls (more than 10 mm/h). However, the model could not explain the PAH profiles of runoff particles; the profiles of 12 PAH compounds tracked in this study were almost constant and more similar to those of road dust than roof dust throughout tie event. An improved model is developed which explains the runoff behaviour by considering two types of road dust with different mobility. (C) 2004 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.watres.2004.07.023

    Web of Science

    PubMed

    researchmap

  • 基調報告 河川における栄養塩類とその管理の方向性 (特集・水質)

    古米 弘明

    河川   60 ( 11 )   5 - 11   2004.11

     More details

    Language:Japanese   Publisher:日本河川協会  

    CiNii Books

    researchmap

  • Source apportionment of polycyclic aromatic hydrocarbons in road dust in Tokyo

    P Pengchai, H Furumai, F Nakajima

    POLYCYCLIC AROMATIC COMPOUNDS   24 ( 4-5 )   773 - 789   2004.8

     More details

    Language:English   Publisher:TAYLOR & FRANCIS LTD  

    This study was aimed at investigating source apportionment of PAHs in urban road dust. Seven kinds of PAHs sources were defined: diesel vehicle exhaust, gasoline vehicle exhaust, tire, asphalt-pavement, asphalt or bitumen, petroleum products excluding tire and asphalt, and the combustion products except for those in vehicle engines. Using cluster analysis combined with principal component analysis, 189 source data were classified into 11 source groups (S1-S11) based on the content percentage of 12 individual PAHs (12-PAH profiles). Thirty-seven dust samples on nine streets in Tokyo were collected and analyzed for 12-PAH profiles. In order to estimate the PAHs, contributions of S1-S11 to dust samples, the multiple regression analysis was performed. The 12-PAH Profiles of each dust sample and those of 11 source groups were applied as dependent and independent variables, respectively. We defined the comparative contribution of each source group as the ratio of each regression coefficient to the sum of them. The result revealed that diesel vehicle exhaust, tire, and pavement were the major contributors of PAHs in the road dust.

    DOI: 10.1080/10406630490487828

    Web of Science

    researchmap

  • 下水処理水の土壌カラム通水試験による土壌微生物生態への影響評価

    坂田佳子, 栗栖太, 矢木修身, 古米弘明

    日本水環境学会年会講演集   38th   216   2004.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • Evaluation of runoff reduction effect of rainwater infiltration facility in urban region using a distributed model

    Furumai Hiroaki, H.K.P.K. Jinadasa, Murakami Michio, Nakajima Fumiyuki, Hijioka Yasuaki

    Proceeding of Annual Conference   17 ( 0 )   160 - 161   2004

     More details

    Publisher:水文・水資源学会  

    都市域における浸透施設は雨天時のピーク流量や汚濁負荷流出量を抑制し,地下水涵養促進の効果が期待されているがその普及は必ずしも進んでいない。本研究では,個々のマンホールや下水管をモデル化可能な分布型モデルに浸透施設を組み込み,工種別・浸透施設別の浸透量を考慮した雨水流出解析を行い,その再現性について検討すること通じて,浸透施設の流出抑制効果を定量的な評価を試みた。

    researchmap

  • 数値流体解析と活性汚泥モデルシミュレーションを用いたオキシデーション・ディッチ内溶存酸素濃度分布の基礎的な評価

    豊岡和宏, 佐藤茂雄, 土屋 玄, 谷口文武, 古米弘明

    第16回環境システム計測制御(E I C A)研究発表会論文集   9 ( 2 )   35 - 38   2004

     More details

  • SPECIFICATION METHOD OF COMBINED SEWER PIPES WITH HIGH SEDIMENT DEPOSITION FOR WET WEATHER POLLUTION ANALYSIS

    ITOI Yusuke, FURUMAI Hiroaki, NAKAJIMA Fumiyuki

    Doboku Gakkai Ronbunshuu G   32   183 - 190   2004

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    It is important to understand the location of combined sewer pipes with high deposits to reduce CSO pollutant load efficiently, because the sewer solids has a significant influence on the overflow pollutant load during the wet weather. In this study, field surveys were carried out to confirm which types of pipe structure have a tendency to accumulate deposits during the dry weather period. Most of the specified pipes with high deposits by a distributed model were under stagnant flow condition and had high deposits, although the amount of deposit was not verified. Therefore, the specification method of sewer pipe with high deposits was developed based on pipe network data and pollutant transportation calculation using the Ackers and White Equation. A simplified procedure to estimate the amount of deposition during the dry weather period was also proposed.

    DOI: 10.2208/proer.32.183

    researchmap

  • MICROBIAL COMMUNITY ANALYSIS IN THREE ANAEROBIC/AEROBIC ACTIVATED SLUDGE PROCESSES FED WITH ACETATE, DOMESTIC SEWAGE WITH AND WITHOUT PARTICULATE ORGANIC MATTER

    LEE Mikyung, NAKAJIMA Fumiyuki, FURUMAI Hiroaki

    ( 762 )   61 - 68   2004

     More details

  • Quinone Profile Analysis of Activated Sludge during Start-up Phase in Anaerobic/Oxic Sequencing Batch Reactor

    FUJITA Masafumi, FURUMAI Hiroaki, NAKAJIMA Fumiyuki

    Journal of Japan Society on Water Environment   27 ( 3 )   189 - 194   2004

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    A bench-scale anaerobic/oxic sequencing batch reactor (SBR) was operated for 35 days with peptone and acetate fed as carbon sources during the start-up phase. In order to find quinone biomarkers representing bacteria the play important roles in priming the enhanced biological phosphorus removal (EBPR) process, the time variations of 12 quinone species and EBPR activities were quantitatively compared in the SBR. Both phosphate release rate and specific phosphate release rate increased at the beginning of the operation and reached maximum on the 21st day. It was interpreted kinetically that the concentration of phosphate-accumulating organisms (PAOs) in the reactor and the fractional percentage of PAOs in the sludge increased in the first 21 days. Only MK-10 showed a good correlation with EBPR activity through out this period, and therefore, MK-10 could be a candidate biomarker. Since Q-9 and MK-7 showed good correlations only in the first seven days, these two quinone species may be present in bacteria that play certain roles during the early phase of EBPR development.

    DOI: 10.2965/jswe.27.189

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00237364005?from=CiNii

  • Series of surveys for enteric viruses and indicator organisms in Tokyo Bay after an event of combined sewer overflow

    H Katayama, K Okuma, H Furumai, S Ohgaki

    WATER SCIENCE AND TECHNOLOGY   50 ( 1 )   259 - 262   2004

     More details

    Language:English   Publisher:I W A PUBLISHING  

    Combined sewer overflows (CSOs) have been recognised as one of the serious sources of pollution to the water environment during rain events, although field surveys to investigate the effect of their magnitude and duration on receiving waters have been very limited. The fates of enteric viruses (norovirus G 1, G2, enteroviruses) and coliforms were determined in the wastewater treatment plant on a fine day and on a rainy day. Not all microorganisms were reduced in the primary treatment, but were reduced in the secondary treatment. Occurrences of enteric viruses and levels of coliforms were surveyed in the receiving coastal area after a CSO event, with the profiles of the enteric viruses in the coastal seawater being almost at the same positive ratio for 4 d after the CSO event.

    Web of Science

    researchmap

  • CSO汚濁負荷の効果的削減を目的とした堆積物局在管渠の簡易な特定手法の検討 (第41回下水道研究発表会講演集 平成16年度)

    糸井 優輔, 古米 弘明, 中島 典之

    下水道研究発表会講演集   41   366 - 368   2004

     More details

    Language:Japanese   Publisher:日本下水道協会  

    CiNii Books

    researchmap

  • リン除去プロセスを追加したASM3の実下水でのキャリブレーション (第41回下水道研究発表会講演集 平成16年度)

    和田 真澄, 藤田 昌史, 古米 弘明

    下水道研究発表会講演集   41   122 - 124   2004

     More details

    Language:Japanese   Publisher:日本下水道協会  

    CiNii Books

    researchmap

  • 都市の水循環と流域水管理のアプローチ--河川と下水道の連携 (特集 これからの都市と水)

    古米 弘明

    新都市   57 ( 10 )   7 - 14   2003.10

     More details

    Language:Japanese   Publisher:都市計画協会  

    CiNii Books

    researchmap

  • 健全な水循環系の構築へ向けた新たな水質管理の展開 (新春特別企画 日本の水道・下水道・水環境 明日への戦略と挑戦(2))

    古米 弘明

    水道公論   39 ( 2 )   28 - 32   2003.2

     More details

    Language:Japanese   Publisher:日本水道新聞社  

    CiNii Books

    researchmap

  • Distinction of Size-Fractionated Road and Roof Dust Based on PAH Contents and Profiles

    MURAKAMI Michio, NAKAJIMA Fumiyuki, FURUMAI Hiroaki

    Journal of Japan Society on Water Environment   26 ( 12 )   837 - 842   2003

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    For the purpose of developing a runoff model for polycyclic aromatic hydrocarbons (PAHs) in urban areas, this study focused on the contents and profiles of PAHs in road and roof dust. The result of cluster analysis of the profiles of PAHs in the size-fractionated dust showed that roof dust formed a different cluster from road dust irrespective of either the particle size or the roof structure. Factor analysis revealed that phenanthrene, indeno(1,2,3-cd)pyrene and benzo(ghi)perylene were important PAHs for distinguishing road dust from roof dust. The result of the factor analysis also suggested that the contribution of tires, pavements or asphalts to PAHs is greater in road dust than in roof dust and that the contribution of vehicle exhaust emission to PAHs is greater in roof dust than in road dust. A nonparametric test indicated that the contents of PAHs are higher in fine dust (smaller than 106μm) than in coarse dust (larger than 106μm).

    DOI: 10.2965/jswe.26.837

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00235058609?from=CiNii

  • Characterization of Dissolved Organic Matter (DOM) based on the adsorption principals onto coagulated floc

    KOMATSU Kazuhiro, NAKAJIMA Fumiyuki, FURUMAI Hiroaki

    Doboku Gakkai Ronbunshuu G   40, 237-245   237 - 245   2003

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    Adsorption experiments using three types of model flocs and various DOM were conducted for the purpose of characterization of DOM based on the adsorption principals. The model flocs were (1) ferric oxide under pH=9.5 (Fe9.5) acting as the absorbent by ligand exchange, (2) ferric oxide under pH=6.5 (Fe6.5) as the absorbent both by ligand exchange and by charge neutralization, and (3) silica with cationic polyacrylamide (Si+C) as the absorbent by cation bridging. The DOM samples included lake water as well as amino acids, sugars, organic acids, protein, polysaccharide, humic acid, and lignin. The comparison of the DOM concentrations before and after the adsorption experiment indicated that DOM with low molecular weight was not adsorbed by all the model flocs. The adsorption potential of DOM was evaluated as the residual ratio of DOM after adsorption experiment in the case of 3.6g/L floc concentration. The potential varied among the DOM as lake water<lignin<albumin≅starch≅humic acid at the conditions of Fe9.5 and Fe6.5. Under the condition of Si+C, the potential was lower compared with Fe9.5 and Fe6.5 except for albumin. The selective adsorption of DOM with E260 was observed, and the selectivity was highest under the Si+C condition.

    DOI: 10.11532/proes1992.40.237

    researchmap

  • Long-Term Runoff Monitoring of Urban Nonpoint Pollution Load in a Separate Sewer System using Autosampler and Monitoring Devices

    HIJIOKA Yasuaki, FURUMAI Hiroaki

    Journal of Japan Society on Water Environment   26 ( 4,237-242 )   237 - 242   2003

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    Continuous stormwater runoff monitoring was conducted in May 1999 and from April 20 to May 24, 2000, at a separate sewer system with 67 ha drainage area. The impervious surface covers about 40 % of the entire drainage area in this study. The monitoring stations were equipped with a direct sampling device from stormwater pipes, a water level sensor, a rain gauge, and a turbidity sensor. The monitoring frequency of the sensors was set at one minute. Two sets of autosamplers with 24 bottles were installed for runoff sampling during initial 8 hours of a rainfall event. Intensive sampling was scheduled within the initial runoff period. Suspended solids were measured as an indicator of pollutants for runoff samples prefiltered with a 2 mm mesh, and furthermore they were classified into fine and coarse fractions with a GF/C filter (1.2 μm pore size) and stainless steel sieve (45 μm mesh). The behaviors of fine particle fractions from 1.2 μm to 45 μm and coarse particle fractions from 45 μm to 2 mm showed clearly different runoff patterns. The fine particle runoff took place in all monitored rainfall events, while the coarse particles tended to be washed off when the rainfall intensity was over a certain level. The fine particle fraction contributed to the total runoff loads rather than the coarse particle fraction in the monitored rainfall events with a small amount of rainfall height and weak intensity.

    DOI: 10.2965/jswe.26.237

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00167841065?from=CiNii

  • Analysis of Dissolved Organic Matter and Bacterial Community in Degradation of Algal Bloom by EEMS and PCR-DGGE

    KASUGA Ikuro, NAKAJIMA Fumiyuki, FURUMAI Hiroaki

    Journal of Japan Society on Water Environment   26 ( 3,171-174 )   171 - 174   2003

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    Lysis and degradation of algal bloom mainly composed of cyanobacteria collected from Tsukui Lake were investigated. Excitation emission matrix spectroscopy (EEMS) and polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) were applied to elucidate the relationship between production of dissolved organic matter and bacterial community change during the lysis of algal bloom followed by their degradation in a batch incubation test. The lysis of algal bloom was indicated by rapid increases of dissolved organic carbon and UV absorbance at 260 nm within five days. In accordance with the lysis, several fluorescence peaks derived from humic- and protein-like substances appeared in the EEM. A significant shift of bacterial community was also demonstrated by the marked change in the DGGE profile. Phylogenetic analysis of the major DGGE bands showed that bacteria closely related to γ-Proteobacteria, CFB group and α-Proteobacteria probably played important roles in the lysis and degradation of algal bloom. When the fluorescence intensity of humic-like substances decreased significantly after 10 days incubation, one of the dominant DGGE bands had a very similar DNA sequence to that of the species reported to be able to degrade humic substances.

    DOI: 10.2965/jswe.26.171

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00164225721?from=CiNii

  • Present State and Conservation Policy of Water Environment in Switzerland

    YOSHIMURA Chihiro, FURUMAI Hiroaki

    Journal of Japan Society on Water Environment   26 ( 2 )   93 - 98   2003

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    Switzerland is the primary "watershed of Europe." The Swiss Alps feeds all major Central European rivers including the Rhône, Danube, Rhine and Po. The country also plays a very active international role in environmental affairs since many multinational organizations such as the United Nations, the International Union for Conservation of Nature and Natural Resources (IUCN) and the Ramsar Convention are based in Switzerland. In the present paper we give a brief overview of the water policy of Switzerland and provide selected examples of the state and trends of the water environment. The most fundamental principles in water management were formulated in the Water Protection Law in 1991 and subsequently updated in 1991. In it, the protection of groundwater and the maintenance of residual flow in rivers and streams were manifested. Ground water supplies 80 % of the total water consumption of the human population. Local authorities identify groundwater protection areas, and unpolluted wastewater such as storm water is also used to recharge the aquifer. Furthermore, minimum residual flows are calculated to maintain the ecological integrity of rivers and streams. Finally, we compare the Swiss situation with the water conservation policy in Japan.

    DOI: 10.2965/jswe.26.93

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00163980607?from=CiNii

  • Excitation-Emission Fluorescence Spectra and Trihalomethane Formation Potential in Tama River, Japan(共著)

    NAKAJIMA Fumiyuki

    Water Science and Technology: Water Supply   2 ( 5-6 )   481 - 486   2003

  • 地域レベルでの水事情認識が不可欠--都市住民が行政界を超えて流域単位での水問題を認識することの重要性 (わが国の水問題の諸相)

    古米 弘明

    季刊河川レビュ-   32 ( 3 )   4 - 10   2003

     More details

    Language:Japanese   Publisher:新公論社  

    CiNii Books

    researchmap

  • Model analysis of wash‐off process from pervious area and planted zone in sidewalk.

    糸井優輔, 中島典之, 古米弘明, 肱岡靖明

    環境システム研究論文発表会講演集   30th   41 - 46   2002.10

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • Sustainable watershed management: An international multi-watershed case study

    W Wagner, J Gawel, H Furumai, MP De Souza, D Teixeira, L Rios, S Ohgaki, AJB Zehnder, HF Hemond

    AMBIO   31 ( 1 )   2 - 13   2002.2

     More details

    Language:English   Publisher:ROYAL SWEDISH ACAD SCIENCES  

    Global freshwater resources are being increasingly polluted and depleted, threatening sustainable development and human and ecosystem health. Utilizing case studies from 4 different watersheds in the United States, Japan, Switzerland, and Brazil, this paper identifies the most relevant sustainability deficits and derives general vectors for more sustainable water management. As a consequence of the demographic and economic developments experienced in the last few decades, each watershed has suffered declines in water quality, streamflow and biotic resources. However, the extent and the cultural perception of these water-related problems vary substantially in the different watersheds, leading to specific water-management strategies. In industrialized countries, exemplified by the US, Switzerland, and Japan, these strategies have primarily consisted of finance- and energy-intensive technologies, allowing these countries to meet water requirements while minimizing human health risks. But, from a sustainability point of view, such strategies, relying on limited natural resources, are not long-term solutions. For newly industrialized countries such as Brazil, expensive technologies for water management are often not economically feasible, thus limiting the extent to which newly industrialized and developing countries can utilize the expertise offered by the industrialized world. Sustainable water management has to be achieved by a common learning process involving industrialized, newly industrialized, and developing countries, following general sustainability guidelines as exemplified in this paper.

    DOI: 10.1639/0044-7447(2002)031[0002:SWMAIM]2.0.CO;2

    Web of Science

    PubMed

    researchmap

  • 自動車排出物、タイヤおよび道路舗装材のPAHsプロファイルとそれらの側溝堆積物中PAHsへの寄与(共著)

    環境科学会誌   15 ( 6、433-442 )   2002

  • 都市域の雨天時汚濁負荷流出解析の現状と課題

    水環境学会誌   25 ( 9 )   524 - 528   2002

     More details

  • Dynamic behavior of suspended pollutants and particle size distribution in highway runoff

    H Furumai, H Balmer, M Boller

    WATER SCIENCE AND TECHNOLOGY   46 ( 11-12 )   413 - 418   2002

     More details

    Language:English   Publisher:I W A PUBLISHING  

    Continuous runoff quality monitoring was conducted for one month at urban highway drainage with an area of 8.4 ha. Dynamic change of suspended solids and heavy metal concentrations were investigated during first flush periods, taking the particle size distribution into consideration. Except for Pb, the concentrations of TSS and heavy metals in runoff were within the range of the EMC reported in recent highway runoff research. Particle-bound heavy metals (Zn, Pb, and Cu) accounted for more significant pollutant loads than soluble fractions. Their content decreased with increasing total SS concentration in runoff samples. The results of particle size distribution (PSD) analysis of runoff samples indicate that high TSS concentration samples contained coarser particles. Based on the PSD results, a stepwise wash-off phenomenon of TSS under varying runoff rate conditions was explained by the different washoff behavior of fine (&lt; 20 mum) and coarser particles.

    Web of Science

    researchmap

  • Characterization of natural organic matter in a shallow eutrophic lake

    PB Thapa, F Nakajima, H Furumai

    WATER SCIENCE AND TECHNOLOGY   46 ( 11-12 )   465 - 471   2002

     More details

    Language:English   Publisher:I W A PUBLISHING  

    Natural organic matter (NOM) from five sampling stations of a shallow, eutrophic lake, Lake Kasumigaura was analyzed in four different seasons of a year by several NOM characterization methods including GPC and pyrolysis GC/MS with the objective of elucidating its characteristics as well as studying its temporal and spatial changes. A comparison was also made among the characteristics of NOM from this and two other lakes. The study showed that NOM in Lake Kasumigaura had comparable DOC, UVA(260), and THMFP with that of Lake Inbanuma, but much higher than that of Lake Tsukui. Both molecular weight and polydispersities remained similar among those three sources but these values were significantly smaller in comparison with Suwannee River NOM. The similarity, index analysis based on pyrochromatograms was useful to evaluate spatial and seasonal changes in NOM characteristics. Distinctive characteristics of NOM at KS1 (station near the mouth of Sakura River) were better explained by the difference in pyrochromatograms rather than in general water quality. Except for KS1, the change in NOM characteristics in the lake water was found to be more pronounced in different seasons than at different locations.

    Web of Science

    researchmap

  • 酢酸から懸濁有機物への基質変化が嫌気好気活性汚泥のリン除去特性に及ぼす影響 (第39回下水道研究発表会講演集)

    李 美京, 古米 弘明, 中島 典之

    下水道研究発表会講演集   39   638 - 640   2002

     More details

    Language:Japanese   Publisher:日本下水道協会  

    CiNii Books

    researchmap

  • 雨天時を想定した嫌気好気活性汚泥実験におけるリン除去過程のモデル解析 (第39回下水道研究発表会講演集)

    藤田 昌史, 小針 昌則, 古米 弘明

    下水道研究発表会講演集   39   230 - 232   2002

     More details

    Language:Japanese   Publisher:日本下水道協会  

    CiNii Books

    researchmap

  • A-41 DGGE法およびクローニング法によるアオコ分解過程における真正細菌群集の構造解析(群集構造解析2,口頭発表)

    春日 郁郎, 中島 典之, 古米 弘明

    日本微生物生態学会講演要旨集   ( 18 )   58 - 58   2002

     More details

    Language:Japanese   Publisher:日本微生物生態学会  

    CiNii Books

    researchmap

  • Characterization of Algogenic Organic Matter Produced by Microcystis aeruginosa at Low Nutrient Concentrations Using Specific Ultraviolet Absorbance and Excitation Emission Matrix

    KOMATSU Kazuhiro, NAKAJIMA Fumiyuki, FURUMAI Hiroaki

    Japan journal of water pollution research   25 ( 12 )   743 - 749   2002

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    The analyses of specific ultraviolet absorbance (SUVA) and excitation emission matrix (EEM) were applied to characterize algogenic organic matter (AOM) produced by Microcystis aeruginosa at low nutrient concentrations and at three different N/P ratios. The production of dissolved organic carbon (DOC) during stationary phase was 3.6-5.8 times as much as that during exponential phase at any N/P ratios, while the components with ultraviolet absorbance at 260nm (E260) were remarkably released during the exponential phase at N/P=20. The ΔE260/ΔDOC value during the exponential phase at N/P=20 was 5.1 l·Abs·mgC-1·m-1, which was significantly higher than the reported values for AOMs. Six peaks of fluorescence intensity on EEM maps were identified and one of them (called "Pα" at 230 nm/430 nm (excitation/emission)) had never been reported as a fluorescence peak before. Peak profiles of AOMs on EEM maps were characterized by 1) the presence of Pα, 2) the absence of P3, 3) the relatively high fluorescence intensities at P1 and P2, and 4) the higher fluorescence intensity at P4 than at P6. EEM maps were divided into four zones according to the position of important peaks. The presence of unidentified peaks was discussed based on the relationship between fluorescence peak intensity and the integral value of fluorescence within each zone.

    DOI: 10.2965/jswe.25.743

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00161609753?from=CiNii

  • Quinone Profile Analysis of Fractionated EBPR Activated Sludge Treating Municipal Wastewater by Centrifugation in Sucrose Solution

    FUJITA Masafumi, FURUMAI Hiroaki, NAKAJIMA Fumiyuki

    Japan journal of water pollution research   25 ( 12 )   757 - 761   2002

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    A simple method was developed to recover high P content fraction in enhanced biological phosphate removal activated sludge. The method was based on the concept of centrifugal separation in sucrose solution with different density. The quinone profiles of the fractionated samples were analyzed to determine quinone biomarkers for phosphate-accumulating organisms. Addition of 4% paraformaldehyde and lowered temperature around 4°C protected the activated sludge from lysis due to the osmotic pressure of the solution. Homogenization for 15 min was appropriate for the dispersion of the flocs by a homogenizer (φ2cm, 3500rpm). Using 50.0%, 51.2% and 52.4% sucrose solutions, the activated sludge was fractionated appropriately. In the case of 51.2% sucrose solution, relatively high P content activated sludge and low P content one were fractionated. Comparing their quinone profiles, the high P content one had higher fractions of Q-8 and MK-7.

    DOI: 10.2965/jswe.25.757

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00161609777?from=CiNii

  • Direct and indirect inactivation of Microcystis aeruginosa by UV-radiation

    MDZ Bin Alam, M Otaki, H Furumai, S Ohgaki

    WATER RESEARCH   35 ( 4 )   1008 - 1014   2001.3

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Excessive algal growth in drinking water sources like lakes and reservoirs is responsible for filter-clogging, undesirable taste and odor, disinfection-by-product formation and toxin generation. Although various methods are currently being used to control algal bloom, their successes are limited. Some water utilities routinely use copper sulfate to control excessive algal growth. But there is a growing concern against its use mainly because it is non-specific to target algae and kills many non-target species. In this study. the scope of using UV-radiation to control algal growth was assessed using Microcystis aeruginosa as test species. A UV-dose of 75 mW scm(-2) was found to be lethal to M. aeruginosa. A smaller dose of 37 mW scm(-2) prevented growth for about 7 days. It was found that UV-radiation may increase the specific gravity of the cells and thus may adversely affect the ability of the cells to remain in suspension. Three days after a UV-dose of 75 mW scm(-2). almost an the cells settled to the bottom of the incubation tubes, whereas all the unirradiated cells remained in suspension. It was also observed that UV-radiation on algal extracellular products has a significant residual effect and can contribute to alga growth control. The extent of residual effect depends on the UV-dose and can continue even for 7 days. UV-radiation was found to produce H2O2 in the muM level concentration. But at such level, H2O2 itself is not likely to cause the residual effect that was found in this study. (C) 2001 Elsevier Science Ltd. All rights reserved.

    DOI: 10.1016/S0043-1354(00)00357-2

    Web of Science

    PubMed

    researchmap

  • MODIFIED WASHOFF MODELS OF ROOF AND ROAD FOR URBAN NON-POINT POLLUTION ANALYSIS

    HIJIOKA Yasuaki, FURUMAI Hiroaki

    685 ( 685 )   123 - 133   2001

     More details

  • Modified models of wash-off from roofs and roads for non-point pollution analysis during first flush phenomena

    Yasuaki Hijioka, Fumiyuki Nakajima, Hiroaki Furumai

    In : Urban Drainage Modeling - Proceedings of the Specialty Symposium of the World Water and Environmental Resources Congress (Eds: Robert W. Brashear and Cedo Maksimovic)   275 - 286   2001

     More details

  • Modified Washoff Models of Roof and Road for Urban Non-point Pollution Analysis

    Journal of Environmental Systems and Engineering   685 ( (]G0007[)-20 )   123 - 134   2001

     More details

  • Wet Weather Pollution Analysis by a Distributed Model in a Combined Sewer System Containing an Additional Stormwater Pipe for Inundation Control

    Journal of Japan Sewage Works Association   38 ( 467 )   99 - 112   2001

     More details

  • Modeling effect of remaining nitrate on phosphorus removal in SBR

    AA Kazmi, M Fujita, H Furumai

    WATER SCIENCE AND TECHNOLOGY   43 ( 3 )   175 - 182   2001

     More details

    Language:English   Publisher:I W A PUBLISHING  

    Nitrate shock loading experiments were conducted in a bench scale SBR to investigate the effect of nitrate on phosphorus removal. After achieving satisfactory phosphorus removal under steady state operation, initial NO3-N concentration amounting to 10 and 20 mg /L was fed at the beginning of the cycle. It was observed that, 10 mg/L of NO3-N suppressed phosphorus release during the feed and mix phases. Organic consumption for denitrification lead to limited PHA storage by phosphorus removing bacteria, resulting in less PO4-P removal. For 20 mg/L, influent organic substrate was not sufficient even for complete denitrification, thus leading to the presence of higher NO3-N and PO4-P in effluent. To explain the dynamics of the nutrient removal system under the transient loading, a SBR model based on IAWQ ASM2 was implemented. After adjusting PHA contents, model simulations well predicted dynamic changes of nitrate and phosphate concentrations during a cycle. Based on the model simulations, competition of COD substrate among denitrification, fermentation and oxygen respiration were investigated by calculating their consumption rates during mixing phase. In addition, a nitrate disappearance model was proposed and implemented in conjunction with a settling model to predict remaining and effluent nitrate in a cycle of SBR. Furthermore, integrated model simulations highlighted the effect of remaining nitrate on phosphorus release considering different options of reactions in settling phase.

    Web of Science

    researchmap

  • THMFP and Molecular Weight Distribution of Dissolved Organic Matter Released from Reservoir Bottom Sediment

    Journal of Water and Waste   43 ( 7 )   5 - 11   2001

     More details

  • Nitrate Uptake Rate(NUR)and Phosphorus Release Rate(PPR)of Activated Sludge

    PENGCHAI Petch, FURUMAI Hiroaki, NAKAJIMA Fumiyuki, FUJITA Masafumi

    Journal of Japan Sewage Works Association   38 ( 465 )   97 - 109   2001

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • Wet Weather pollution Analysis by a Distributed Model in a Combined Sewer System Containing an Additional Stormwater Pipe for Inundation Control

    FURUMAI Hiroaki, HIJIOKA Yasuaki, ICHIKAWA Arata

    Journal of Japan Sewage Works Association   38 ( 467 )   99 - 112   2001

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • ダム湖底泥溶出水のトリハロメタン生成能と溶存有機物分子量分布(共著)

    中島 典之, 古米 弘明, Thapa Phatta Bahadur

    用水と廃水   43 ( 7 )   5 - 11   2001

     More details

    Language:Japanese   Publisher:産業用水調査会  

    CiNii Books

    researchmap

  • Fractionation of Organic Compounds in Domestic Wastewater Based on Settleability and Their Characterization by Oxygen Uptake Rate (OUR), Nitrate Uptake Rate (NUR) and Phosphorus Release Rate (PPR) of Activated Sludge

    PENGCHAI Petch, FURUMAI Hiroaki, NAKAJIMA Fumiyuki, FUJITA Masafumi

    Journal of Japan Sewage Works Association   38 ( 465 )   97 - 109   2001

     More details

    Language:Japanese  

    CiNii Books

    researchmap

  • Quinone profile analysis of activated sludge in enhanced biological P removal SBR treating actual sewage

    H. Furumai, M. Fujita, F. Nakajima

    In : Advances in Water and Wastewater Treatment Technology - Molecular technology, nutrient removal, sludge reduction, and environmental health (Eds: T. Matsuo, K. Hanaki, S. Takizawa and H. Satoh)   165 - 174   2001

     More details

  • Modeling and field survey on wash-off behavior of suspended particles from roofs and roads

    Hiroaki Furumai, Yasuaki Hijioka, Fumiyuki Nakajima

    In : Urban Drainage Modeling - Proceedings of the Specialty Symposium of the World Water and Environmental Resources Congress (Eds : Robert W. Brashear and Cedo Maksimovic)   225 - 237   2001

     More details

  • Analysis of Seasonal and Structural Changes in Microbial Community including Algae in Tsukui Lake by PCR-DGGE

    KASUGA Ikuro, FURUMAI Hiroaki, NAKAJIMA Fumiyuki, ARII Suzue

    Japan journal of water pollution research   24 ( 12、50-58 )   856 - 864   2001

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    Seasonal change of microbial community including bacteria and algae in Tsukui Lake, an eutrophic reservoir in Kanagawa prefecture, was investigated by denaturing gradient gel electrophoresis (DGGE) of polymerase chain reaction (PCR) amplified fragments of 16S rDNA from May to October in 2000. A sudden algal bloom of cyanobacteria (Microcystis sp. and Anabaena sp.) after a heavy storm in July was observed both from a traditional algal cell counting and from a DGGE banding pattern analysis. In order to express graphically the seasonal change of the community based on the dissimilarity index, multi-dimensional scaling (MDS) was applied. The MDS map revealed a cyclic change of the community and a distinctive divergence from the path during the agal bloom. Since the divergence disappeared in an analysis with the DGGE image excluding the bands of cyanobacteria, the major part of the community appeared in the DGGE image might be independent of the sudden algal bloom. Dissimilarity of microbial communities was much lower among three different sampling sites than among the sampling months.

    DOI: 10.2965/jswe.24.856

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00152525901?from=CiNii

  • Analysis of Seasonal and Structural Changes in Microbial Community including Algae in Tsukui Lake by PCR-DGGE

    KASUGA Ikuro, FURUMAI Hiroaki, NAKAJIMA Fumiyuki, ARII Suzue

    Japan journal of water pollution research   24 ( 12 )   856 - 864   2001

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    Seasonal change of microbial community including bacteria and algae in Tsukui Lake, an eutrophic reservoir in Kanagawa prefecture, was investigated by denaturing gradient gel electrophoresis (DGGE) of polymerase chain reaction (PCR) amplified fragments of 16S rDNA from May to October in 2000. A sudden algal bloom of cyanobacteria (Microcystis sp. and Anabaena sp.) after a heavy storm in July was observed both from a traditional algal cell counting and from a DGGE banding pattern analysis. In order to express graphically the seasonal change of the community based on the dissimilarity index, multi-dimensional scaling (MDS) was applied. The MDS map revealed a cyclic change of the community and a distinctive divergence from the path during the agal bloom. Since the divergence disappeared in an analysis with the DGGE image excluding the bands of cyanobacteria, the major part of the community appeared in the DGGE image might be independent of the sudden algal bloom. Dissimilarity of microbial communities was much lower among three different sampling sites than among the sampling months.

    DOI: 10.2965/jswe.24.856

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00152525901?from=CiNii

  • 下水道台帳データベースと細密数値情報を利用した分布型モデルによる都市雨水流出解析(共著)

    肱岡 靖明, 市川 新, 古米 弘明

    下水道協会誌   38 ( 469、79‐90 )   79 - 90   2001

     More details

    Language:Japanese   Publisher:日本下水道協会  

    CiNii Books

    researchmap

  • 修正RRL法と分布型モデルによる浸水解析の比較

    渡辺晋太郎, 肱岡靖明, 古米弘明, 吉田精, 南浦詳仁

    下水道研究発表会講演集   37th   194 - 196   2000.6

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 相模湖・津久井湖の藻類による汚濁機構解明とその浄化・資源化技術に関する研究-水道水源としての評価に関する研究-(共著)

    中島 典之, 滝沢 智, 古米 弘明

    東京大学工学部総合試験所年報   59   53 - 59   2000

     More details

    Language:Japanese   Publisher:東京大学工学部総合試験所  

    CiNii Books

    researchmap

  • A simple settling model for batch activated sludge process

    AA Kazmi, H Furumai

    WATER SCIENCE AND TECHNOLOGY   42 ( 3-4 )   9 - 16   2000

     More details

    Language:English   Publisher:IWA PUBLISHING  

    A simple settling model for the batch activated sludge process was proposed that could predict sludge concentration profile as a function of time. The predicted dynamic biomass profile would be used to quantify biological reactions during settling. The model can be applied by giving easily measurable parameters such as initial MLSS concentration, sludge interface variation which characterizes the settling rate,and SVI as an index of biomass settleability. The model describes the sedimentation process of the sludge by linking three concentrations, namely the MLSS on sludge interface (X-H), constant MLSS on sediment surface (X-C), and the variable MLSS at the bottom (X-B). It was tested for wide ranges of activated sludge concentrations (1750 mg/L-4630 mg/L) and SVI (104-285). The model was applied to express MLSS profile for a full scale SBR as well as for 1 and 2 m column settling tests. The simulated MLSS profile by linking three critical concentrations agrees well with the observed data. Mass balance applied at each time step indicated that the deviation was from -2 to +12% of the total initial mass. The stratified MLSS profile simulated from the model was applied to predict denitrification rate during settling.

    Web of Science

    researchmap

  • Field investigations on reactive settling in an intermittent aeration sequencing batch reactor activated sludge process

    AA Kazmi, H Furumai

    WATER SCIENCE AND TECHNOLOGY   41 ( 1 )   127 - 135   2000

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    The overall reactions during settling in an intermittent aeration SBR activated sludge process have been studied on a full scale. Several field investigations were conducted during settling in different seasons. Nitrate, MLSS, phosphate and TOC profiles were obtained at specified depths. Mass balances of nitrogen were made in order to evaluate the effect of different MLSS and seasonal conditions on nitrogen removal during settling. Total nitrogen reduction of more than 30% was achieved during settling by maintaining high MLSS in order of 3000 mg/L. Residual DO plays an important role in causing delay of denitrification for lower MLSS sludge concentration. Phosphorus release was observed in the bottom of the reactor and its occurrence was well coincident with the pH decrease. Denitrification rates and their temperature dependency were determined. Temperature coefficient theta was found to be 1.083 (valid in the range of 17-27 degrees C). Mass transfer limitation during batch sludge settling was discussed. It was found out from batch tests with and without mixing, that denitrification rate was reduced by 40% under mass transfer limiting conditions.

    Web of Science

    researchmap

  • Seasonal Variation of Trihalomethane Formation Potential and Monocular Size Distribution of Dissolved Organic Matters in a Drinking Water Reservoir

    Journal of Japan Water Works Association   69 ( 4 )   31 - 38   2000

     More details

  • Research and Development Project on Purification Technology and Management for Eutrophication Control and Utilization of Algal Products of Sagami and Tsukui Lakes, Kanagawa Prefecture

    Journal of Water and Waste   42 ( 4 )   7 - 14   2000

     More details

  • Research and Development Project on Purification Technology and Management for Eutrophication Control and Utilization of Algal Products of Sagami and Tsukui Lakes, Kanagawa Prefecture-Evaluation of the Water Quality as Drinking Water Sources-

    Annual Report of Engineering Research Institute, School of Engineering, University of Tokyo   59   53 - 59   2000

     More details

  • 高度下水処理運転支援用活性汚泥シミュレータの開発

    古屋勇治, 橋田邦彦, 水谷高明, 佐々木康成, 古米弘明

    EICA   5 ( 1 )   105 - 110   2000

     More details

    Language:Japanese   Publisher:EICA環境システム計測制御学会  

    CiNii Books

    researchmap

  • 貯水池内溶存有機物の分子量分布およびトリハロメタン生成能の季節変動(共著)

    水道協会雑誌   69 ( 4 )   31 - 38   2000

     More details

  • 相模湖・津久井湖の藻類による汚濁機構解明とその浄化・資源化技術に関する研究(共著)

    用水と廃水   42 ( 4 )   7 - 14   2000

     More details

  • Modeling long term nutrient removal in a sequencing batch reactor

    H Furumai, AA Kazmi, M Fujita, Y Furuya, K Sasaki

    WATER RESEARCH   33 ( 11 )   2708 - 2714   1999.8

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    A modified version of IAWQ activated sludge model 2 (ASM 2) was developed to address the long-term dynamic behavior of nutrients in a sequencing batch reactor (SBR) activated sludge process. Experimental data was obtained from a long-term experimental work carried out in a 100-1 bench scale SBR. Changes in TOC, NH4-N, NO3-N, NO2-N and PO4-P could be reliably predicted after the model parameters were adapted to the SBR conditions. Better phosphorus dynamics were achieved by considering the sub-model of denitrification by phosphorus accumulating organisms (PAO). Long-term simulations were carried out with the calibrated model to investigate the behavior of N and PO4-P under disturbed loading conditions. After attaining sufficient biological phosphorus removal activities in the sludge, influent TOC concentration was stepwise decreased and increased for 5 weeks, nle decrease in organic loading caused the deterioration of biological phosphorus removal with simultaneous increase in effluent NO3-N concentration Subsequently increasing the organic loading restored the original effluent conditions. The model simulation predictions well match with the experimental results under disturbed organic loading conditions. The simulated results implied that the deteriorating phenomena of phosphorus removal can be explained by two mechanisms: poor P-uptake by PAO and washout of PAO itself. (C) 1999 Elsevier Science Ltd. All rights reserved.

    DOI: 10.1016/S0043-1354(98)00470-9

    Web of Science

    researchmap

  • Modeling long term nutrient removal in a sequencing batch reactor

    H Furumai, AA Kazmi, M Fujita, Y Furuya, K Sasaki

    WATER RESEARCH   33 ( 11 )   2708 - 2714   1999.8

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    A modified version of IAWQ activated sludge model 2 (ASM 2) was developed to address the long-term dynamic behavior of nutrients in a sequencing batch reactor (SBR) activated sludge process. Experimental data was obtained from a long-term experimental work carried out in a 100-1 bench scale SBR. Changes in TOC, NH4-N, NO3-N, NO2-N and PO4-P could be reliably predicted after the model parameters were adapted to the SBR conditions. Better phosphorus dynamics were achieved by considering the sub-model of denitrification by phosphorus accumulating organisms (PAO). Long-term simulations were carried out with the calibrated model to investigate the behavior of N and PO4-P under disturbed loading conditions. After attaining sufficient biological phosphorus removal activities in the sludge, influent TOC concentration was stepwise decreased and increased for 5 weeks, nle decrease in organic loading caused the deterioration of biological phosphorus removal with simultaneous increase in effluent NO3-N concentration Subsequently increasing the organic loading restored the original effluent conditions. The model simulation predictions well match with the experimental results under disturbed organic loading conditions. The simulated results implied that the deteriorating phenomena of phosphorus removal can be explained by two mechanisms: poor P-uptake by PAO and washout of PAO itself. (C) 1999 Elsevier Science Ltd. All rights reserved.

    DOI: 10.1016/S0043-1354(98)00470-9

    Web of Science

    researchmap

  • ポンプ場及び貯留管を有する合流式下水道地区における汚濁負荷解析への分布型モデルの適用

    肱岡靖明, 古米弘明

    下水道研究発表会講演集   36th   204 - 206   1999.6

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 粒状層硫黄脱窒による地下水からの硝酸性窒素除去-添加基質濃度の影響-(共著)

    古米弘明

    水道協会雑誌   68 ( 12 )   12 - 21   1999

     More details

  • 回分式活性汚泥法のスタートアップ実験における硝化及び脱リン活性の変化(共著)

    下水道協会誌   36 ( 443 )   99 - 111   1999

     More details

  • Nitrate Removal from Ground Water by Biological Granular Filter using Sulfur Denitrification-Effects of Substrate Concentrations on Removal Performance

    Journal of Japan Water Works Association   68 ( 12 )   12 - 21   1999

     More details

  • Evaluation of storage ability of an additional main pipe in inundation control for suspended solids loads from CSO using a distributed model(共著)

    Proc. of the 8th International Conference on Urban Storm Drainage   3   1262 - 1270   1999

     More details

  • Application of distributed model to the sewer networks in highly urbanized area in Japan(共著)

    HIJIOKA Y.

    Proc. of the 8th International Conference on Urban Storm Drainage   3   1407 - 1414   1999

     More details

  • Effect of sludge retention time (SRT) on nutrient removal in sequencing batch reactors

    H Furumai, AA Kazmi, Y Furuya, K Sasaki

    JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING   34 ( 2 )   317 - 328   1999

     More details

    Language:English   Publisher:MARCEL DEKKER INC  

    Two bench-scale activated sludge Sequencing Batch Reactors (SBR's), with working volumes of 100 liters each, operated on synthetic wastewater at sludge retention times (SRT) of 7 days (Reactor 1) acid 15 days (Reactor 2) respectively. Biological phosphorus and nitrogen removals were applied in the systems to study nitrification, denitrification, and phosphorus removal kinetics during the start-up phase. Excellent enhanced biological phosphorus removal was achieved in both reactors within 21 days. The maximum phosphorus release rate in each reactor was IO-mg PO4-P/ g.MLSS.h at 20 degrees C and phosphorus contents of about 5% dry weight of biomass were achieved. In Reactor 2, very good nitrification was achieved with 100% ammonia removal within initial two weeks of operation. The maximum nitrification rate was 3.0 mg NO3-N/g. MLSS.h, but later phosphorus release rates continued to decline, due to the elevated remaining nitrate concentrations from preceding cycles in the initial fill and mix phase. Remaining nitrate consumes influent organic during the fill and mix phase, decreasing the availability of organic matter for phosphorus removing bacteria, thus deteriorating their activity. For SBR 1, phosphorus release rates didn't shows any decline, as incomplete nitrification led to much lower nitrate during the initial fill and mix phase. The present study implied that higher SRT is beneficial for phosphorus removal. But later, SRT should be reduced to decrease the nitrification activity, if the target is phosphorus removal, otherwise remaining elevated nitrate concentration diminishes phosphorus removal.

    Web of Science

    researchmap

  • Effect of sludge retention time (SRT) on nutrient removal in sequencing batch reactors

    H Furumai, AA Kazmi, Y Furuya, K Sasaki

    JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING   34 ( 2 )   317 - 328   1999

     More details

    Language:English   Publisher:MARCEL DEKKER INC  

    Two bench-scale activated sludge Sequencing Batch Reactors (SBR's), with working volumes of 100 liters each, operated on synthetic wastewater at sludge retention times (SRT) of 7 days (Reactor 1) acid 15 days (Reactor 2) respectively. Biological phosphorus and nitrogen removals were applied in the systems to study nitrification, denitrification, and phosphorus removal kinetics during the start-up phase. Excellent enhanced biological phosphorus removal was achieved in both reactors within 21 days. The maximum phosphorus release rate in each reactor was IO-mg PO4-P/ g.MLSS.h at 20 degrees C and phosphorus contents of about 5% dry weight of biomass were achieved. In Reactor 2, very good nitrification was achieved with 100% ammonia removal within initial two weeks of operation. The maximum nitrification rate was 3.0 mg NO3-N/g. MLSS.h, but later phosphorus release rates continued to decline, due to the elevated remaining nitrate concentrations from preceding cycles in the initial fill and mix phase. Remaining nitrate consumes influent organic during the fill and mix phase, decreasing the availability of organic matter for phosphorus removing bacteria, thus deteriorating their activity. For SBR 1, phosphorus release rates didn't shows any decline, as incomplete nitrification led to much lower nitrate during the initial fill and mix phase. The present study implied that higher SRT is beneficial for phosphorus removal. But later, SRT should be reduced to decrease the nitrification activity, if the target is phosphorus removal, otherwise remaining elevated nitrate concentration diminishes phosphorus removal.

    Web of Science

    researchmap

  • Model Analysis for Biological Phosphorus Removal in SBR Activated Sludge Process : Effects of organic substrate composition and remaining nitrate at mixing phase

    FUJTTA Masafumi, FURUMAI Hiroaki, NAKAJIMA Fumiyuki

    Environmental Engineering Research   36   155 - 165   1999

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    An anaerobic/aerobic sequencing batch activated sludge reactor was operated by using synthetic wastewater consisted of peptone and glucose as carbon sources. The response of phosphorus release and uptake to different carbon sources was investigated by conducting three different experiments. After achieving a good biological phosphorus removal, the organic substrates were changed solely to glucose, to peptone and to sodium acetate respectively. It was found out that the wastewater having sodium acetate yielded highest phosphorus release and that peptone gave the lowest. The difference in the phosphorus release and uptake was appeared to be strongly dependent on organic substrate composition in relation to hydrolysis and fermentation process.<BR>Other sets of experiment were also performed to investigate the effect of remaining nitrate at mixing phase on phosphorus removal. Nitrate concentrations were adjusted to 10 and 20 mg-N/L at the initial mixing phase. It was found out that the nitrate addition suppressed phosphorus release during a whole mixing phase, the less phosphorus release with limited PHA storage seemed to increase effluent phosphorus concentration afterwards. Therefore in order to achieve reliable phosphorus removal, the nitrate at the beginning of initial feed/mixing phase should be as low as possible. A SBR model based on IAWQ ASM2 was applied to explain the phosphorus and nitrate dynamics in the response experiments that were carried out for continuous period of 28 days. The long-term simulation results well explain the dynamics of phosphorus and nitrogen during a cycle as well as effluent water quality, when denitrification process by Poly-phosphate Accumulating Organisms was considered and kinetic parameters were adjusted for the synthetic organic substrates.

    DOI: 10.11532/proes1992.36.155

    researchmap

  • 回分式活性汚泥モデルによる栄養塩除去に及ぼす運転条件の影響評価 (第36回下水道研究発表会講演集) -- (口頭発表セッション セッション7 水処理・再利用)

    古屋 勇治, 佐々木 康成, 古米 弘明

    下水道研究発表会講演集   36   457 - 459   1999

     More details

    Language:Japanese   Publisher:日本下水道協会  

    CiNii Books

    researchmap

  • Model Analysis for Biological Phosphorus Removal in SBR Activated Sludge Process: Effects of organic substrate composition and remaining nitrate at mixing phase.:Effects of organic substrate composition and remaining nitrate at mixing phase

    FUJTTA Masafumi, FURUMAI Hiroaki, NAKAJIMA Fumiyuki

    Doboku Gakkai Ronbunshuu G   36   155 - 165   1999

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    An anaerobic/aerobic sequencing batch activated sludge reactor was operated by using synthetic wastewater consisted of peptone and glucose as carbon sources. The response of phosphorus release and uptake to different carbon sources was investigated by conducting three different experiments. After achieving a good biological phosphorus removal, the organic substrates were changed solely to glucose, to peptone and to sodium acetate respectively. It was found out that the wastewater having sodium acetate yielded highest phosphorus release and that peptone gave the lowest. The difference in the phosphorus release and uptake was appeared to be strongly dependent on organic substrate composition in relation to hydrolysis and fermentation process.<BR>Other sets of experiment were also performed to investigate the effect of remaining nitrate at mixing phase on phosphorus removal. Nitrate concentrations were adjusted to 10 and 20 mg-N/L at the initial mixing phase. It was found out that the nitrate addition suppressed phosphorus release during a whole mixing phase, the less phosphorus release with limited PHA storage seemed to increase effluent phosphorus concentration afterwards. Therefore in order to achieve reliable phosphorus removal, the nitrate at the beginning of initial feed/mixing phase should be as low as possible. A SBR model based on IAWQ ASM2 was applied to explain the phosphorus and nitrate dynamics in the response experiments that were carried out for continuous period of 28 days. The long-term simulation results well explain the dynamics of phosphorus and nitrogen during a cycle as well as effluent water quality, when denitrification process by Poly-phosphate Accumulating Organisms was considered and kinetic parameters were adjusted for the synthetic organic substrates.

    DOI: 10.11532/proes1992.36.155

    researchmap

  • Application of Distributed Model to the sewerage systems in Japan and future problems.

    肱岡靖明, 古米弘明, 市川新

    水文・水資源学会研究発表会要旨集   1998   94 - 95   1998.8

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • Modelling of nitrogen removal in sequencing batch reactors treating domestic sewage

    H Furumai, M Nagasaka, Y Sato

    INDIAN JOURNAL OF ENGINEERING AND MATERIALS SCIENCES   5 ( 4 )   173 - 181   1998.8

     More details

    Language:English   Publisher:NATL INST SCIENCE COMMUNICATION  

    A non-steady-state model was developed to describe the nitrification and denitrification as well as COD removal in sequencing batch reactors (SBRs). The model was designed to discuss the effect of increasing volume by sewage feed, and the effects of changing aeration and mixing conditions during operational cycles on treatment performance. The formation and degradation of soluble organic microbial products (SMPs) were also considered in the model, because SMP is a significant organic component in biologically treated effluents. Most of the rate equations are based on the double-Monod expression and four types of biomass (heterotrophs, ammonium oxidizers, nitrite oxidizers, and inert biomass) exist in the model. Changes of GOD, ammonia and NO, during a cycle were simulated well in an 8 hour-cycle experiment using actual primary effluents. The simulation results predicted that remaining COD after 90 min mixing and 270 min aeration were almost SMP and particulate COD components. The initial concentrations of heterotrophs and nitrifiers were determined by DO consumption rate and nitrification rate of the sludge using given maximum specific substrate consumption rates. In conclusion, the model was available for discussion of effects of operational options, such as single-feed/step-feed and aeration/mixing time, on the nitrogen removal as well as organic matters.

    Web of Science

    researchmap

  • Physical Diversity of River Bed Structure and Standing Benthonic Organisms in a Resectioned River

    Water and Waste   40 ( 3 )   211 - 219   1998

     More details

  • 河川改修区間における河床形状の多様性と底生生物の現存量評価

    増淵 忍, 伊佐治 進, 古米 弘明

    用水と廃水   40 ( 3 )   211 - 219   1998

     More details

    Language:Japanese   Publisher:産業用水調査会  

    CiNii Books

    researchmap

  • Control of Algal Growth by UV-Radiation(共著)

    Alam M. Z. B., Otaki M., Furumai H., Ohgaki S.

    Environmental Engineering Research、JSCE   35   111 - 118   1998

     More details

    Language:English   Publisher:Japan Society of Civil Engineers  

    Excessive algal growth in drinking water sources like lakes and reservoirs is responsiblefor filter-clogging, undesirable taste and odor, disinfection-by-product formation and toxingeneration. Although various methods are currently being used to control algal bloom, theirsuccesses are limited. Many water utilities routinely use copper sulfate to control excessive algalgrowth. But there is a growing concern against its use mainly because it is non-specific to targetalgae and kills many non-target species. In this study, the scope of using UV-radiation to controlalgal growth was assessed using Microcystis aeruginosa and Anabena vulgaris as test species. Forboth of these species, an incident UV-dose of 450-m Ws/cm2 was found to be lethal. A smaller doseof 180-m Ws/cm2 prevented growth for about 7-days. It was also observed that UV-radiation onalgal extracellular products has a significant residual effect and can contribute to algal growthcontrol. The extent of residual effect depends on the UV-dose and can continue even for 7-days.

    DOI: 10.11532/proes1992.35.111

    researchmap

  • Nitrate Disappearance during Batch Settling in Sequencing Batch Reactor Activated Sludge Process(共著)

    KAZMI A. A.

    Environmental Engineering Research JSCE   35   387 - 394   1998

  • Modeling of hydrogen behavior and reduced product formation following perturbation with hydrogenic substrate in a methanogenic reactor

    H Furumai

    WATER SCIENCE AND TECHNOLOGY   36 ( 6-7 )   255 - 262   1997

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    The purposes of this study are to develop a non-steady state model which can express hydrogen behavior and reduced products formation in a perturbed methanogenic CSTR and to investigate energetic and kinetic interaction such as hydrogen transfer between H-2 producers and consumers. Smith and McCarty (1989a, 1989b) obtained interesting experimental results on transient responses of the perturbed mixed-culture methanogenic CSTR receiving ethanol and propionate. In an experiment with a sudden addition of propionate and ethanol at steady state, they observed highly elevated H-2 pressure and formation of reduced products such as propanol and longer chained VFAs. The model was applied to the perturbation experiment introducing a new concept of H-2 transport between bacterial groups, Different H-2 concentrations are defined by making a hydrogen transport within a colony of H-2 producers and consumers, The modified model expressed the sudden change of H-2 pressure and the formation of the reduced intermediate products which brought relatively low H-2 concentration. Once kinetics and energetic of biochemical reactions are given, the model could be available for transient processes and for better understanding of interactions between H-2 producers and consumers. (C) 1997 IAWQ. Published by Elsevier Science Ltd.

    DOI: 10.1016/S0273-1223(97)00530-1

    Web of Science

    researchmap

  • 水処理における健康関連微生物の除去と不活性化

    水環境学会誌   20 ( 3 )   12,134-138   1997

     More details

  • Removal and Inactivation of Helath-related Microorganisms in Water and Wastewater Treatment

    Jour. of Japan Society on Water Environment   20 ( 3 )   12,134-138   1997

     More details

  • Extracellular polymers of hydrogen-utilizing methanogenic and sulfate-reducing sludges

    XS Jia, H Furumai, HHP Fang

    WATER RESEARCH   30 ( 6 )   1439 - 1444   1996.6

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Extracellular polymers (ECP) play an important role in biological wastewater treatment. They are believed to be responsible for the formations of flocculent activated sludge as well as anaerobic granules; In this study, the ECP characteristics of two types of enrichment cultures were examined. One enriched culture was composed of hydrogenotrophic methanogens (HM) alone while the other was composed of HM and hydrogenotrophic sulfate-reducing bacteria (HSR). Both cultures were enriched through a series of 107 repeated batches using H-2/CO2 plus, in the HM/HSR series, sulfate and nutrients. At various stages of the enrichment process, the ECP were extracted from the sludge samples and analyzed for their protein (ECP(p)) and carbohydrate (ECP(c)) contents. Results showed that in the mixed culture HM consumed 67% of hydrogen and HSR 33%. The net yields of biomass for HM and HSR cultures were 0.046 g-VSS/g-COD and 0.059 g-VSS/g-COD, respectively. Productions of ECP were dependent upon substrate. Glucose-degrading sludge produced more ECP than the HM culture, which in turn produced more than the HSR culture. The net ECP yields for HM culture were 1.06 mg-ECP(p)/g-COD and 0.64 mg-ECP(e)/g-COD, respectively; the corresponding yields for HSR culture were 0.74 mg-ECP(p)/g-COD and 0.52 mg-ECP(c)/g-COD. For the enriched HM culture, more ECP(p), as well as ECP(c) but to a lesser degree, were produced at the beginning of each batch when high concentration of hydrogen was available. This was, however, not noticeable for the HSR culture. Copyright (C) 1996 Elsevier Science Ltd

    DOI: 10.1016/0043-1354(96)00028-0

    Web of Science

    researchmap

  • Yields of biomass and extracellular polymers in four anaerobic sludges

    XS Jia, H Furumai, HHP Fang

    ENVIRONMENTAL TECHNOLOGY   17 ( 3 )   283 - 291   1996.3

     More details

    Language:English   Publisher:SELPER LTD, PUBLICATIONS DIV  

    Extracellular polymers (ECP) are responsible for the flocculation of activated sludge as well as the granulation of anaerobic sludge. In this study, the biomass and ECP yields of four anaerobic sludge were examined. The sludges were enriched by using acetate, propionate, butyrate and glucose, respectively, as the sole substrate. Throughout the enrichment process, which lasted up to 73 cycles, the sludge samples were analyzed for their volatile suspended solids (VSS) as well as ECP's protein (ECP(p)) and carbohydrate (ECP(c)) contents. Under steady-state condition, the net yields of biomass, ECP(p) and ECP(c) were measured for the conversion of each individual substrate to methane and carbon dioxide. Furthermore, the corresponding yields for the acetogenesis of propionate and butyrate, and the acidogenesis of glucose, were also estimated, based on the stoichiometry of the degradation reactions. Results show that acidogenesis of glucose produced more ECP(p) ECP(c) than acetogenesis and methanogenesis. This explains the reported observations that carbohydrate-degrading sludge produced better granules than the acid-degrading sludge.

    DOI: 10.1080/09593331708616386

    Web of Science

    researchmap

  • Structual Change of Resectioned River Beds and Benthic Populations

    FURUMAI Hiroaki, TANIGUCHI Yoshio, FUKUI Ichiro

    ENVIRONMENTAL SYSTEMS RESEARCH   23   644 - 649   1996

     More details

    Publisher:Japan Society of Civil Engineers  

    The purpose of this study is to investigate the benthic population and structural change of river beds where improvement works were conducted at different periods. The changes of periphyton and benthos densities were determined at the resectioned river beds from autumn to winter. The survey results suggested that structural divesity of river bed was dependent on length of period after the improvement works. River bed has larger variety of structure with longer period after resectioning works. There was a difference in benthic population and its density between block-type beds with and without deposited stones and sands. However there was not a remarkable difference in periphyton and benthos densities between block-type bed and stone-type bed, once stones have transported and deposited to some extent on the block-type bed. River bed points with larger biomass density had a tendency to have lower diversity index values, because biomass amount was deeply dependent on the accumulation of one or two predominant biomass groups.

    DOI: 10.2208/proer1988.24.644

    researchmap

  • Removal of Nitrate in Sulfur-Denitrification Filter Process

    FURUMAI Hiroaki, OBAYASHI Hisashi, FUJITA Kenji

    Journal of Japan Society on Water Environment   19 ( 9 )   715 - 723   1996

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    Two types of laboratory-scale experiments were conducted to investigate nitrate removal by sulfur oxidizing denitrifiers fed with thiosulfate as electron donor. One was a batch-type activity test of denitrification with glass vials using enrichment culture. The other was a downflow column experiment at 20°C and at a filtration velocity of 4m·day-1, in which artificially contaminated water was supplied to packed-bed filled with granular anthracites. The stoichiometries of denitrification from nitrate and nitrite by oxidation of thiosulfate were discussed with removal and production data in several batch tests. The conversion rate from nitrate to nitrite was much higher than from nitrite to nitrogen gas in the batch test. The nitrogen concentration profile along the column showed that rapid removal of nitrate was observed at the upper part of the filter after development of biofilm in bed, although remarkable accumulation of nitrite took place there. The accumulation was reduced downward to some extent by distribution of attached biomass to the lower part. However, nitrite in the effluent was not removed completely after ammonium was added as an easily assimilable nitrogen source in order to promote the activity and growth of sulfur-denitrifiers. There was a possibility that their activity and growth was not controlled by nitrogen source for synthesis but suppressed by lower pH condition within the biofilm than bulk water in the column.

    DOI: 10.2965/jswe.19.715

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00042627661?from=CiNii

  • Removal of Nitrate in Sulfur-Denitrification Filter Process

    FURUMAI Hiroaki, OBAYASHI Hisashi, FUJITA Kenji

    Journal of Japan Society on Water Environment   19 ( 9 )   715 - 723   1996

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    Two types of laboratory-scale experiments were conducted to investigate nitrate removal by sulfur oxidizing denitrifiers fed with thiosulfate as electron donor. One was a batch-type activity test of denitrification with glass vials using enrichment culture. The other was a downflow column experiment at 20°C and at a filtration velocity of 4m·day-1, in which artificially contaminated water was supplied to packed-bed filled with granular anthracites. The stoichiometries of denitrification from nitrate and nitrite by oxidation of thiosulfate were discussed with removal and production data in several batch tests. The conversion rate from nitrate to nitrite was much higher than from nitrite to nitrogen gas in the batch test. The nitrogen concentration profile along the column showed that rapid removal of nitrate was observed at the upper part of the filter after development of biofilm in bed, although remarkable accumulation of nitrite took place there. The accumulation was reduced downward to some extent by distribution of attached biomass to the lower part. However, nitrite in the effluent was not removed completely after ammonium was added as an easily assimilable nitrogen source in order to promote the activity and growth of sulfur-denitrifiers. There was a possibility that their activity and growth was not controlled by nitrogen source for synthesis but suppressed by lower pH condition within the biofilm than bulk water in the column.

    DOI: 10.2965/jswe.19.715

    CiNii Books

    researchmap

    Other Link: https://jlc.jst.go.jp/DN/JALC/00042627661?from=CiNii

  • Distribution of Attached Biomass and Activity in a Biological Filter Enriched with Sulfur Denitrifying Bacteria

    Proc. of Environmental Engineering Research   33   247 - 255   1996

     More details

  • Surface charge and extracellular polymer of sludge in the anaerobic degradation process

    XS Jia, HHP Fang, H Furumai

    WATER SCIENCE AND TECHNOLOGY   34 ( 5-6 )   309 - 316   1996

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Changes of surface charge and extracellular polymer (ECP) content were investigated in batch experiments for three anaerobic sludges, each of which had been enriched at 35 degrees C and pH 6.9-7.3 for more than 40 batches using propionate, butyrate and glucose, individually, as the sole substrate. Results showed that both ECP and the negative surface charge were dependent on the growth phase of microorganisms. They increased at the beginning of all batches when the microorganisms were in the prolific-growth phase, having high substrate concentration and food-to-microorganisms ratio. Both later gradually returned to their initial levels when the microorganisms were in the declined-growth phase, as the substrate became depleted. The negative surface charge increased linearly with the total-ECP content in all series with slopes of 0.0187, 0.0212 and 0.0157 meq/mg-total-ECP for sludge degrading propionate, butyrate and glucose, respectively. The change of surface charge for the first two sludges was mainly due to the increase of proteinaceous fraction of ECP; but, for glucose-degrading sludge, that could be due to the increases of both proteinaceous and carbohydrate fractions of ECP. The negative-charged nature of anaerobic sludge implies that cations should be able to promote granulation of anaerobic sludge. Copyright (C) 1996 IAWQ.

    DOI: 10.1016/0273-1223(96)00660-9

    Web of Science

    researchmap

  • Effects of pH and alkalinity on sulfur-denitrification in a biological granular filter

    H Furumai, H Tagui, K Fujita

    WATER SCIENCE AND TECHNOLOGY   34 ( 1-2 )   355 - 362   1996

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Two laboratory-scale biological Filters were operated to investigate the effects of alkalinity and pH on removal of nitrate and nitrite in sulfur denitrification filter processes. The concentration of sodium bicarbonate in the feed media was changed from 120 to 240 mg/l during about 3 months in a filter (Run A). The other filter was initially fed with 300 mg/l and then with 240 mg/l (Run B). The performance of the filter was monitored by measuring pH, nitrate, nitrite, sulfate, alkalinity, and thiosulfate,
    Nitrate concentration in effluent rapidly decreased to lower levels within several days for both filters after inoculation of enrichment culture of sulfur denitrifiers. However there was a large difference in removal of nitrite. When rapid removal of nitrate took place, nitrite accumulation was observed and remained while the bicarbonate concentration was 120 and 150 mg/l. On the other hand the nitrite accumulation disappeared when more bicarbonate (240 and 300 mg/l) was supplied. The experimental results indicated that the nitrite accumulation was closely related to pH condition and alkalinity level in the filter. The stable data of effluent water quality for 5 cases were collected and the relationship discussed between nitrite concentration and pH in effluents. The relationship indicated a strong pH dependency on nitrite accumulation below pH of 7.4. The pH condition around 7 is not so inhibitory to biological activity. Therefore, the pH within the biofilm would be low enough to suppress the nitrite reduction by sulfur denitrifiers, while the pH in effluent was not in the inhibitory range. it was recommended to keep the pH higher than 7.4 to prevent nitrite accumulation in the sulfur denitrification filter. Copyright (C) 1996 IAWQ.

    DOI: 10.1016/0273-1223(96)00544-6

    Web of Science

    researchmap

  • 硫黄脱膣ろ過プロセスにおける付着生物膜量及び脱窒活性の分布特性

    田杭秀規

    土木学会環境工学研究論文集   33   247 - 255   1996

     More details

  • Structural Change of Resectioned River Beds and Benthic Populations

    FURUMAI Hiroaki, TANIGUCHI Yoshio, FUKUI Ichiro

    Environmental Systems Research   23   644 - 649   1996

     More details

    Publisher:Japan Society of Civil Engineers  

    The purpose of this study is to investigate the benthic population and structural change of river beds where improvement works were conducted at different periods. The changes of periphyton and benthos densities were determined at the resectioned river beds from autumn to winter. The survey results suggested that structural divesity of river bed was dependent on length of period after the improvement works. River bed has larger variety of structure with longer period after resectioning works. There was a difference in benthic population and its density between block-type beds with and without deposited stones and sands. However there was not a remarkable difference in periphyton and benthos densities between block-type bed and stone-type bed, once stones have transported and deposited to some extent on the block-type bed. River bed points with larger biomass density had a tendency to have lower diversity index values, because biomass amount was deeply dependent on the accumulation of one or two predominant biomass groups.

    DOI: 10.2208/proer1988.24.644

    researchmap

  • Modeling of Nitrogen Remoual in Sequencing Batch Reactors Treating Domestic Semage (共著)

    Proc. of 5th IAWQ Asian Reg. Conf. on Water Quality and Pollution Control   1995

     More details

  • 瀬と淵における河床付着物および堆積物の硝化活性

    古米弘明

    環境システム研究   23   488 - 493   1995

     More details

  • Nitrification Activities of Streambed Biofilms and Sediments at Rapids and a Pool

    Environmental Systems Research   23   488 - 493   1995

     More details

  • Growth and Nitrification Activity of Periphyton Biofilm in a Local River with a Relatively Small Basin

    Hiroaki FURUMAI, Eiko UEDA

    Environmental Systems Research   22   182 - 187   1994

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    We conducted several field surveys on periphyton biofilm in a local river in the basin of which a sewage treatment system just began to spread. We investigated the development of the biofilm at different points along the Hinuma River. The periphyton biofilm were used to determine the nitrification activity which would be an overall index of nitrogenous pollution. The field survey showed that the periphyton density gradually increased to the maximum level around 2 months, if there were not significant change of river flow. In the nitrification tests, supply of ammonium nitrogen from the biofilms itselfwas observed. Therefore, nitrification activity was evaluated considering the degradation of attached algae as a biofilm component. The activity was higher for biofilms in the urban drainage receiving domestic wastewater than that at the upstream of the river which was less polluted. The biofilm receiving secondary effluent had little nitrification activity. This indicated that residual chlorine or by-product of chlorine disinfection might suppress the nitrification in the biofilm.

    DOI: 10.2208/proer1988.22.182

    researchmap

  • Growth and nitrification activity of periphyton biofilm in a local river with a relatively small basin.

    FURUMAI Hiroaki, UEDA Eiko

    ENVIRONMENTAL SYSTEMS RESEARCH   22   182 - 187   1994

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    We conducted several field surveys on periphyton biofilm in a local river in the basin of which a sewage treatment system just began to spread. We investigated the development of the biofilm at different points along the Hinuma River. The periphyton biofilm were used to determine the nitrification activity which would be an overall index of nitrogenous pollution. The field survey showed that the periphyton density gradually increased to the maximum level around 2 months, if there were not significant change of river flow. In the nitrification tests, supply of ammonium nitrogen from the biofilms itselfwas observed. Therefore, nitrification activity was evaluated considering the degradation of attached algae as a biofilm component. The activity was higher for biofilms in the urban drainage receiving domestic wastewater than that at the upstream of the river which was less polluted. The biofilm receiving secondary effluent had little nitrification activity. This indicated that residual chlorine or by-product of chlorine disinfection might suppress the nitrification in the biofilm.

    DOI: 10.2208/proer1988.22.182

    researchmap

  • EVALUATION OF MULTIPLE-SPECIES BIOFILM AND FLOC PROCESSES USING A SIMPLIFIED AGGREGATE MODEL

    H FURUMAI, BE RITTMANN

    WATER SCIENCE AND TECHNOLOGY   29 ( 10-11 )   439 - 446   1994

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    A simplified model of microbial aggregates is developed to evaluate how the key features of aggregation affect the stability of nitrification in multiple-species biofilms and flocs. The foundation of the model is a layered system in which each layer contains a different type of biomass, includes mass-transport resistance for all substrates (i.e., COD, NH4+, and O-2), and included formation and consumption of soluble microbial products. The model describes how the outer biofilm layer of heterotrophs protects the inner layers of nitrifiers and inert biomass from detachment, so that an inner layer can have a low specific detachment-loss rate. This protecting function is not important for suspended flocs, because the entire flee is wasted. Comparison of biofilm and suspended flocs shows that the protecting function of the biofilms provides greater nitrification stability. The model also demonstrates that extensive heterotrophic growth induced by high organic loading can cause a deterioration of nitrification when the dissolved oxygen is depleted in the inner layer of the aggregate. Although it is based on a simplified spatial distribution, the aggregate model identifies key differences among biofilm, floc, and dispersed-growth processes.

    Web of Science

    researchmap

  • 回分式活性汚泥法における処理過程の非定常モデル

    古米 弘明

    用水と廃水   36 ( 6 )   483 - 490   1994

     More details

    Language:Japanese   Publisher:産業用水調査会  

    CiNii Books

    researchmap

  • A Non-Steady State Model of Sequencing Batch Reactor Processes

    36 ( 6 )   483 - 490   1994

     More details

  • INTERPRETATION OF BACTERIAL ACTIVITIES IN NITRIFICATION FILTERS BY A BIOFILM MODEL CONSIDERING THE KINETICS OF SOLUBLE MICROBIAL PRODUCTS

    H FURUMAI, BE RITTMANN

    WATER SCIENCE AND TECHNOLOGY   30 ( 11 )   147 - 156   1994

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Activities of heterotrophic bacteria in nonsteady-state biofilms were evaluated using a simplified biofilm model in which formation and exchange of soluble microbial products (SMP) by nitrifiers and heterotrophs were considered. The model was applied to experimental results for a trace-level substrate removal. The model predictions indicated that SMP from nitrifiers contributed to supporting heterotrophic growth and their substrate removal potential. The biological interactions were more significant in cases of low influent substrate COD concentrations and increased with higher influent ammonium concentration. The introduction of SMP kinetics into the model captured the key aspects of removal and formation of COD components in biofilms receiving low influent substrate concentrations, such as nitrification filters for drinking water treatment and wastewater reuse.

    Web of Science

    researchmap

  • Kinetic study and mathematical modeling of biofilm in an anaerobic fluidized bed(共著)

    Water Science and Technology   29 ( 10-11 )   369 - 376   1994

     More details

  • 嫌気性流動床における生物膜のモデル化に関する研究(共著)

    環境工学研究論文集   ( 30 )   209 - 217   1993

     More details

  • Study on Nitrification and Denitrification in Well-Mixed Estruary.

    FUTAWATARI Tohru, KIM Won Kyu, KUSUDA Tetsuya, FURUMAI Hiroaki

    Doboku Gakkai Ronbunshu   1993 ( 479 )   111 - 120   1993

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    Modeling of nitrification and denitrification processes in a well-mixed estuary is performed and long term variations in nitrogen concentration are simulated for a fortnightly cycle, in which a Lagrangian reference frame is used to reduce numerical dispersion. In this model, kinetic parameters and the concentrations of nitrifying bacteria are given through experiments, and the denitrification in sediments is considered. On the basis of the simulation results, the process is quantitatively evaluated, and it shows that nitrification is affected by the change of suspended solids concentration during springneap cycles, and that the decrease in concentration of nitrate in water body is caused by nitrate reduction due to denitrification in sediments.

    DOI: 10.2208/jscej.1993.479_111

    CiNii Books

    researchmap

  • 強混合河川感潮部における硝化・脱窒過程に関する研究(共著)

    二渡 了, 大石 京子, 古米 弘明, 楠田 哲也

    土木学会論文集   ( 479 )   101 - 110   1993

     More details

    Language:Japanese   Publisher:土木学会  

    DOI: 10.2208/jscej.1993.479_101

    CiNii Books

    researchmap

  • Mathematical Modeling of Biofilm in an Anaerobic Fluidized Bed

    Proceedings of Environmental Engineering Research   ( 30 )   209 - 217   1993

     More details

  • Measurement and prediction of hydrogen partial pressure in a glucose fermenting UASB reactor during start-up (共著)

    Proceedings of 4th IAWQ Asian Regional Conference on Water Conservation and Pollution Control   I-10   1993

     More details

  • Simulation of Nitrification and Denitrification Processes in Well-Mixed Estuary

    Journal of Hydraulic, Coastal and Environmental Engineering, JSCE   479 ( II-25(第2部門) )   111 - 120   1993

     More details

  • Study on Nitrification and Denitrification in Well-Mixed Estuary

    Journal of Hydraulic, Coastal and Environmental Engineering, JSCE   479 ( II-25(第2部門) )   101 - 110   1993

     More details

  • 環境特性の指標化と沿岸域の特性評価に関する研究(共著)

    三村 信男, 関 和美, 古米 弘明

    海岸工学論文集   40 ( 40 )   1041 - 1045   1993

     More details

    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/proce1989.40.1041

    researchmap

  • Formation of Extracellular Polymer and Surface Charge of Sludges in Anaerobic Degradation Processes

    Xiaoshan JIA, Hiroaki FURUMAI, Tetsuya KUSUDA

    Journal of Japan Society on Water Environment   16 ( 12 )   859 - 868   1993

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    Extracellular polymer (ECP) formation and the effect on the surface charge of anaerobic sludge was investigated using each sludge which degraded glucose, propionate, butyrate, or acetate as a single organic substrate. The effect of ECP accumulation on surface charge of the sludges was also discussed in relation to sludge flocculation.<br>ECP contents in sludge were measured with time during each substrate degradation test using glass vials. The accumulation ratio of ECP-protein exceeded that of ECP-carbohydrate for all cases. The highest accumulation ratio was observed for the glucose degradation test. The calculation from COD balance on substrate revealed that several percents of the substrate utilized for growth was taken to form ECP. As more ECP was accumulated, the sludge surface was more negative in charge except the case of acetate. The increasing negative charge could be neutralized by added divalent cations such as calcium to promote floculation of anaerobic sludges.

    DOI: 10.2965/jswe.16.859

    researchmap

  • Formation of Extracellular Polymer and Surface Charge of Sludges in Anaerobic Degradation Processes

    JIA Xiaoshan, FURUMAI Hiroaki, KUSUDA Tetsuya

    Journal of Japan Society on Water Environment   16 ( 12 )   859 - 868   1993

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    Extracellular polymer (ECP) formation and the effect on the surface charge of anaerobic sludge was investigated using each sludge which degraded glucose, propionate, butyrate, or acetate as a single organic substrate. The effect of ECP accumulation on surface charge of the sludges was also discussed in relation to sludge flocculation.<br>ECP contents in sludge were measured with time during each substrate degradation test using glass vials. The accumulation ratio of ECP-protein exceeded that of ECP-carbohydrate for all cases. The highest accumulation ratio was observed for the glucose degradation test. The calculation from COD balance on substrate revealed that several percents of the substrate utilized for growth was taken to form ECP. As more ECP was accumulated, the sludge surface was more negative in charge except the case of acetate. The increasing negative charge could be neutralized by added divalent cations such as calcium to promote floculation of anaerobic sludges.

    DOI: 10.2965/jswe.16.859

    researchmap

  • Detachment Rate and Specific Activity of Attached Biomass in a Methanogenic Fluidized Bed

    IMAI Tsuyoshi, FURUMAI Hiroaki, KUSUDA Tetsuya

    Proceedings of Environmental and Sanitary Engineering Research   28,11-20   11 - 20   1992

     More details

    Publisher:Japan Society of Civil Engineers  

    The objectives of this study are to evaluate the distribution of specific activity within attached biofilm in afluidized bed and to investigate the detachment of each "active" biomass from the biofilm. A fluidized bed was operated in asteady state as a methanogenic reactor with supply of a synthetic wastewater, a mixture of acetate, propionate, and butyrate.Batch experiments were conducted to measure the specific activities of biomass in effluent, stepwise sloughed biomass, andattached biomass in bed. The results indicated that the biomass in the surface layer of biofilm had much higher activity thanthat inside the layer. The highest activity was obtained for biomass in effluent. The distributions of the activities illustrated thatmore "active" biomass existed in the biofilm surface where more frequent detachment of biomass occurred.The trend of the activity distribution was explained by a newly developed model considering accumulation of inert biomassand biomass detachment from biofilm surface. A first order rate constant of detachment for each "active" biomass was roughlyestimated at 0.013, 0.022, and 0.055 [day-1] for acetate, propionate, and butyrate decomposing biomasses, respectively. Theestimated values were much larger than literature values based on whole biomass. The model predicts that bacteria with highergrowth rates are able to exist predominantly in the surface layer against high biomass detachment and that the decay biomassmainly accumulates inside the biofilm.

    DOI: 10.11532/proes1983.28.11

    researchmap

  • 嫌気性流動床における剥離速度と付着生物活性に関する研究(共著)

    衛生工学研究論文集   28,11-20   1992

  • Estimation of Microbial Decay Coefficients in Methanogenesis

    Journal of Japan Society on Water Environment   15 ( 3 )   179 - 186   1992

  • Modeling of Accumulation of Inert Organic Solids in Anaerobic Fluidized Bed.

    FURUMAI Hiroaki, IMAI Tsuyoshi, KUSUDA Tetsuya

    Japan journal of water pollution research   15 ( 11 )   828 - 838   1992

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    A simple model, which includes accmulation of inert organic solids such as decayed biomass and extracellular polymers, has been developed to predict the treatment efficiency, and to evaluate the accumulation of "active biomass" and the biofilm development in a methanogenic fluidized bed. Mass balance equations of substrate and biomass comprised additional rate terms of extracellular polymer production and biomass detachment, respectively.<br>The results of a steady-state analysis indicated that the biofilm contained a significant amount of inert organic solid when a lower detachment rate was given to the inert solids than the "active biomass". The accumulation of inert organic solids might explain why reported maximum specific rates of acetate consumption for methanogenic biofilms were much lower than those of enriched and pure cultures of acetate utilizing methanogens. The conventional concept of solid retention time (SRT) seems to overestimate the true SRT of "active biomass", which is a more useful index for controlling the treatment in fluidized beds. The model experiments also implied that maximum specific activities of total biofilm and washed-out biomass were fundamentally related to the biomass detachment rates at the biofilm surface. Determination of the activities of sloughed biomass would be useful to investigate the bacterial distribution in biofilms.

    DOI: 10.2965/jswe.15.828

    researchmap

  • Modeling of Accumulation of Inert Organic Solids in Anaerobic Fluidized Bed

    Journal of Japan Society on Water Environment   15 ( 11 )   828 - 838   1992

  • Nonsteady-state Analysis of Performance and Biofilm Development in a Methanogenic Fluidized Bed.

    FURUMAI Hiroaki, IMAI Tsuyoshi, KUSUDA Tetsuya

    Japan journal of water pollution research   15 ( 11 )   839 - 849   1992

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    Accumulation of inert organic solids within biofilm in a methanogenic fluidized bed was investigated by conducting a continuous feed experiment in which the influent substrate concentration was stepwise increased. The previously developed model considering accumulation of inert organic solids and biomass detachment was applied to the simulations of biofilm growth and treatment efficiency in the above-mentioned experiment.<br>The transient response of treatment were well explained with the model by giving the growth kinetic constants and the detachment coefficients of the responsible "active biomass", whose concentrations were defined with the substrate consumption activities. The biofilm growth was deeply associated with the accumulation of inert organic solids, the rate of which depended on the decay coefficient and the growth yields of "active biomass" as well as the detachment coefficient. The detachment coefficient was estimated to be much smaller for decayed biomass than "active biomass" and bio-polymer. The attached biomass in the methanogenic fluidized bed contained a significant amount of bio-polymers which reached around 8 to 10% of total organic solids of biofilm. The production rate coefficient was estimated at 0.4 to 0.5 [mgCODPoly·mgCODcell-1] with the assumed growth yield of 0.05 [mgCODcell·mgCOD-1].

    DOI: 10.2965/jswe.15.839

    researchmap

  • Nonsteady-state Analysis of Performance and Biofilm Development in a Methanogenic Fluidized Bed

    Journal of Japan Society of Water Environment   15 ( 11 )   839 - 849   1992

  • ADVANCED MODELING OF MIXED POPULATIONS OF HETEROTROPHS AND NITRIFIERS CONSIDERING THE FORMATION AND EXCHANGE OF SOLUBLE MICROBIAL PRODUCTS

    H FURUMAI, BE RITTMANN

    WATER SCIENCE AND TECHNOLOGY   26 ( 3-4 )   493 - 502   1992

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Biological process modeling is advanced by explicitly describing heterotroph and nitrifier biomass, incorporating formation of soluble microbial products (SMP) from both the bacterial groups, and allowing degradation of SMP by the heterotrophs. Biomass decay now has two parts, endogenous respiration and formation of biomass-associated products (BAP). The model is applied to investigate interactions between heterotrophs and nitrifiers. Main attention is directed to evaluating the role that SMP produced by nitrifiers plays as a supply of organic substrate to heterotrophs and to predicting the COD concentration in the effluent. The model quantitatively describes the observed accumulation of SMP in the effluent at long SRT and at high influent substrate concentration. The significance of SMP from nitrifiers to support growth of heterotrophs is clearly elucidated through the model experiments under various operational conditions. The results indicated that a high NH4+-N/COD ratio in the influent would decrease original substrate COD due to increased heterotrophs whose growth is supported by SMP from nitrifiers, but total COD increases. The minimum substrate concentration, S(min), is reduced for heterotrophs by the additional growth from SMP.

    Web of Science

    researchmap

  • Estimation of Microbial Decay Coefficients in Methanogenesis

    IMAI Tsuyoshi, FURUMAI Hiroaki, KUSUDA Tetsuya

    Journal of Japan Society on Water Environment   15 ( 3 )   179 - 186   1992

     More details

    Language:Japanese   Publisher:Japan Society on Water Environment  

    An estimation method of decay coefficients of anaerobic bacteria involved with methanogenesis is experimentally discussed from the aspect that decay phenomena have an important role in biofilm development and its composition.<br>Attached biomass in a methanogenic fluidized bed was collected and incubated for more than 100 days without any substrate addition. During the incubation, batch tests of substrate consumption were conducted to estimate each concentration of &ldquo;active&rdquo; biomass which decomposes acetate, propionate or butyrate. The growth increment in bacteria during the batch tests was taken into consideration, when the &ldquo;active&rdquo; biomass concentrations were estimated. In addition, the biomass concentrations were corrected by subtracting biomass increment due to the production of fatty acids from decomposition of biomass decayed during incubation. Neglecting the increments of the biomass during the batch tests and incubation caused a significant error in the estimation of decay coefficients.<br>The decay cefficients of acetate, propionate and butyrate decomposing bacteria were estimated at 0.014, 0.015 and 0.024 [day-1] , respectively, based on the decrease in &ldquo;active&rdquo; biomass concentrations with incubation time. The coefficients are available to investigate the accumulation of inactive biomass in the anaerobic biofilm.

    DOI: 10.2965/jswe.15.179

    researchmap

  • Transient Responses of Wastewater Treatment and Biomass Development in a Methanogenic Fluidized Bed(共著)

    Water Science and Technology   ( 23 )   1365 - 1372   1991

     More details

  • Transient Response of Wastewater Treatment and Biomass Development in a Methanogenic Fluidised Bed

    FURUMAI H.

    Wat.Sci.Tech.   23   1327 - 1336   1991

     More details

  • UASB反応器のスタートアップにおける水素分圧の変化と細胞外ポリマー生成について(共著)

    賈 暁珊, 古米 弘明, 楠田 哲也

    下水道協会誌   28 ( 334 )   83 - 93   1991

     More details

    Language:Japanese   Publisher:日本下水道協会  

    CiNii Books

    researchmap

  • Change of Hydrogen Partial Pressure and the Formation of Extracellular Polymer during Start-up of Upflow Anaerobic Sludge Bed Reactor

    Journal of Japan Sewage Works Association   28 ( 334 )   83 - 93   1991

     More details

  • A KINETIC-STUDY ON METHANOGENESIS BY ATTACHED BIOMASS IN A FLUIDIZED-BED

    T KUBA, H FURUMAI, T KUSUDA

    WATER RESEARCH   24 ( 11 )   1365 - 1372   1990.11

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    DOI: 10.1016/0043-1354(90)90155-Y

    Web of Science

    researchmap

  • UASB反応器のスタートアップにおける凝集化汚泥の活性変化(共著)

    賈 暁珊, 古米 弘明, 楠田 哲也

    九州大学工学集報   63 ( 5 )   503 - 510   1990

     More details

    Language:Japanese   Publisher:九州大学大学院工学研究院  

    CiNii Books

    researchmap

  • バイアル実験によるメタン生成活性の評価手法に関する検討(共著)

    水質汚濁研究   13 ( 2 )   121 - 125   1990

  • Evaluation of Methanogenic Activity Test Using Glass Vials

    Japan Journal of Water Pollution Research   13 ( 2 )   121 - 125   1990

  • 嫌気性混合培養系における酢酸利用メタン生成菌の活性菌体量推定法とその応用

    衛生工学研究論文集   ( 26 )   9 - 18   1990

  • An Estimation Method of Active Biomass Concentration of Acetate Utilizing Methanogen in Anaerobic Mixed Cultures(共著)

    FURUMAI Hiroaki, KUBA Takahiro, KUSUDA Tetsuya

    Proceedings of Environmental and Sanitary Engineering Research   26 ( 26 )   9 - 18   1990

     More details

    Publisher:Japan Society of Civil Engineers  

    A kinetic estimation method for the evaluation of active biomass concentration of acetate utilizing methanogen in mixed culture is proposed and discussed, based on the Monod model. Batch experiments were conducted using an enrichment culture of acetate utilizing methanogen in three different dilution levels to ascertain availability of the estimation method."Active" biomass concentrations were kinetically estimated by both acetate consumption and methane production rates. Both estimated biomass concentrations were proportional to the dilution levels of the enrichment culture. The simultaneously estimated maximum specific growth rate was in good agreement with the literature values in the pure cultures. The changes of acetate and methane concentrations with time in the experiments were clearly explained by the Monod model with the estimated values. Then the estimation method was applied to the determination of concentration of acetate utilizing methanogen in a sewage digester sludge. It was shown that the "active"acetate utilizing methanogen occupied only 1-2% of VSS component. From these results, the "active" biomass concentration is shown to be very useful as a biomass index for the evaluation of treatment efficiency in mixed culture systems which contain non-biomass, such as sediments and sludges.

    DOI: 10.11532/proes1983.26.9

    researchmap

  • Effects of Flocculants on Granulation of Sludge and Activity Change druing Start-up of UASB Reactor

    Technology Report of Kyushu University   63 ( 5 )   503 - 510   1990

     More details

  • ADSORPTION DESORPTION OF PHOSPHORUS BY LAKE-SEDIMENTS UNDER ANAEROBIC CONDITIONS

    H FURUMAI, S OHGAKI

    WATER RESEARCH   23 ( 6 )   677 - 683   1989.6

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    DOI: 10.1016/0043-1354(89)90199-1

    Web of Science

    researchmap

  • PHOSPHORUS EXCHANGE KINETICS AND EXCHANGEABLE PHOSPHORUS FORMS IN SEDIMENTS

    H FURUMAI, T KONDO, S OHGAKI

    WATER RESEARCH   23 ( 6 )   685 - 691   1989.6

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    DOI: 10.1016/0043-1354(89)90200-5

    Web of Science

    researchmap

  • A KINETIC-STUDY ON THE METHANOGENESIS PROCESS IN ANAEROBIC-DIGESTION

    CY LIN, T NOIKE, H FURUMAI, J MATSUMOTO

    WATER SCIENCE AND TECHNOLOGY   21 ( 4-5 )   175 - 186   1989

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Web of Science

    researchmap

  • RADIOCHEMICAL ANALYSIS OF PHOSPHORUS EXCHANGE KINETICS BETWEEN SEDIMENTS AND WATER UNDER AEROBIC CONDITIONS

    H FURUMAI, S OHGAKI

    JOURNAL OF ENVIRONMENTAL QUALITY   17 ( 2 )   205 - 212   1988.4

     More details

    Language:English   Publisher:AMER SOC AGRONOMY  

    Web of Science

    researchmap

  • 嫌気性流動床内付着微生物による揮発性脂肪酸の分解特性(共著)

    九州大学工学集報   61 ( 3 )   239 - 245   1988

     More details

  • Characteristics of Nitrogen Removal by Attached Biomass in Fluidized Bed

    Technology Report of Kyushu University   61 ( 3 )   229 - 237   1988

     More details

  • Characteristics of Volatile Fatty Acid Decomposition in Anaerobic Fluidized Bed

    Technology Report of Kyushu University   61 ( 3 )   239 - 245   1988

     More details

  • Estimation of Nitrification Activity in a Tidal River(共著)

    Proceedings of 2nd IAWPRC Asian Conference on Water Pollution Control, Bangkok   81-87   1988

     More details

  • EFFECT OF SALINITY ON NITRIFICATION IN A TIDAL RIVER

    H FURUMAI, T KAWASAKI, T FUTAWATARI, T KUSUDA

    WATER SCIENCE AND TECHNOLOGY   20 ( 6-7 )   165 - 174   1988

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Web of Science

    researchmap

  • 流動床における担体付着汚泥の窒素除去特性(共著)

    古米 弘明, 青木 潔, 松本 順一郎

    九州大学工学集報   61 ( 3 )   229 - 237   1988

     More details

    Language:Japanese   Publisher:九州大学大学院工学研究院  

    CiNii Books

    researchmap

  • Effect of Loading Rate on Methanogenesis in Anaerobic Expanded Bed Reactor

    Journal of Japan Sewage Works Association   24 ( 280 )   25 - 35   1987

     More details

  • 嫌気性膨脹床におけるメタン生成に及ぼす流入負荷の影響(共著)

    古米 弘明, 松本 明人, 松本 順一郎

    下水道協会誌   24 ( 280 )   25 - 35   1987

     More details

    Language:Japanese   Publisher:日本下水道協会  

    CiNii Books

    researchmap

  • Rediochemical Analysis of Phosphorus Exchange Reaction between Sediments and Water(共著)

    Proceedings of Japan Society of Civil Engineers   ( 351 )   203 - 219   1984

  • 湖沼底泥のリン脱吸着反応の放射性同位元素による解析

    古米弘明, 大垣真一郎

    土木学会論文集   ( 351 )   203 - 212   1984

     More details

    Language:Japanese   Publisher:土木学会  

    DOI: 10.2208/jscej.1984.351_203

    CiNii Books

    researchmap

  • FRACTIONAL COMPOSITION OF PHOSPHORUS FORMS IN SEDIMENTS RELATED TO RELEASE

    H FURUMAI, S OHGAKI

    WATER SCIENCE AND TECHNOLOGY   14 ( 4-5 )   215 - 226   1982

     More details

    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Web of Science

    researchmap

  • 底質中のリン存在形態とリン溶出(共著)

    第4回富栄養化問題シンポジウム、国立公害研究所報告   B22-82,68-76   1982

     More details

  • Release of Phosphorus from Coastal Sediments(共著)

    Journal of the Faculty of Engineering, The University of Tokyo(B)   35 ( 4 )   723 - 733   1980

     More details

▼display all

Awards

  • 下水道協会誌奨励賞

    2002  

  • 日本水道協会有効賞

    2001  

  • 土木学会論文賞

    1995  

  • 日本水質汚濁研究協会論文賞

    1990  

Research Projects

  • Onsite survey of plastic pollution in mangrove ecosystem based on digital image analysis and impact assessment

    Grant number:20KK0247  2020.10 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))  The University of Tokyo

      More details

    Grant amount: \18590000 ( Direct Cost: \14300000 、 Indirect Cost: \4290000 )

    researchmap

  • Prediction and Control of Fecal Pollution by Combined Sewer Overflows in Urban Coastal Waters

    Grant number:20H02283  2020.4 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B) 

      More details

    Grant amount: \17810000 ( Direct Cost: \13700000 、 Indirect Cost: \4110000 )

    researchmap

  • Source Tracking and Prediction of Environmental Fate of Microplastics on Urban Water Cycle

    Grant number:19H00783  2019.4 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)  Kyoto University

      More details

    Grant amount: \44330000 ( Direct Cost: \34100000 、 Indirect Cost: \10230000 )

    researchmap

  • Development of evaluation method of fecal contamination caused by combined sewer overflow in coastal area

    Grant number:16H01788  2016.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)  The University of Tokyo

    FURUMAI Hiroaki

      More details

    Grant amount: \42250000 ( Direct Cost: \32500000 、 Indirect Cost: \9750000 )

    Water quality surveys were conducted daily after rainfall events in the upstream of the Sumida River and around the coastal area of Daiba. We grasped the day-to-day change in faecal contamination situation caused by the combined sewer overflows, which was affected by the tidal change. The temporospatial changes of microbial faecal indicators are affected by the dilution with saline water, and also by the decay effects due to high salinity and solar radiation conditions. In addition, there is a high correlation among the faecal indicator bacteria and easily degradable pharmaceuticals, while the correlation is relatively low between F-specific and somatic E. coli phages. We developed a forecasting system for bathing at the Odaiba seaside park, which is based on many prediction results of peak number of E. coli in Odaiba coastal area by utilizing the three-dimensional water quality simulation results under conditions combining different types of rainfall in Tokyo and tide changes.

    researchmap

  • Assessing pollutant load emission from combined sewer overflows based on monitored changes of water levels and electric conductivity at overflow chambers

    Grant number:16K14329  2016.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research  The University of Tokyo

    Furumai Hiroaki

      More details

    Grant amount: \3510000 ( Direct Cost: \2700000 、 Indirect Cost: \810000 )

    Accumulation and transport of in sewer sediments was studied using a distributed sewerage model to evaluate the occurrence and the behavior of combined sewer overflow (CSO) loads. It was found that there is a large spatial variation in the amount of sediment deposited during dry weather and transported during wet weather. It indicated that spatial distribution characteristics of sediment accumulation and transport should be considered in a sewer network in order to identify the significant sources of the CSO loads.
    Occurrence of CSO loads was evaluated by monitoring water level, water temperature and electric conductivity in combined sewers. It was possible to judge the occurrence of overflow to storm water storage facility for flood control based on the relationship between water level and rainfall intensity. EC monitoring data can be used to evaluate dilution level of wet weather wastewater and estimate the contribution of first flash on the pollutant load in combined sewer pipes.

    researchmap

  • 藻類毒素発生の早期警報スクリーニング用のグラフェン電気化学的センサの開発

    Grant number:15F15712  2015.10 - 2018.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費  東京大学

    古米 弘明, ZHANG WEI

      More details

    Grant amount: \2300000 ( Direct Cost: \2300000 )

    本研究では、富栄養化した湖沼における藍藻類由来の毒素であるミクロシスチン-LR(Microcystin-LR)を対象として、そのモニタリングや定量評価の手法について検討を行った。従来の液クロマトグラフによるMicrocystin-LR検出や定量分析法のような、時間がかかり、高価で、分析技能を要求する方法に代わって、新規なグラフェンフィルム(GF)複合電極バイオセンサを開発した。環境水試料中でのMicrocystin -LRに特異的なモノクローナル抗体のインキュベーション、そして、Microcystin -LRを固定化したGF電極センサの試料へ浸漬という2段階の検出反応を介して、GF電極センサの電気化学インピーダンス測定を介して濃度測定を行うものである。
    開発したセンサは、Microcystin-LRの広い濃度範囲、すなわち0.05~100μg/ Lにわたって濃度と電気化学インピーダンスの間に優れた線形相関関係(R2 = 0.99)が得られた。このセンサは、世界保健機関(WHO)のMicrocystin-LR暫定ガイドライン濃度(すなわち1μg/ L)よりもはるかに低い濃度レベルで十分な感度を有しており、Microcystin-LRを特異的に検出することができる。
    この感度の良さは、グラフェン膜の大きな活性表面積および高い伝導率によって達成でき、効率的な電荷移動プロセスに起因しているものと考えられる。また、特異性は、Microcystin -LRに特異的なモノクローナル抗体を試料水に十分量を添加してインキュベーションする手順を加えたことによる。センサに結合させたMicrocystinがインキュベーション試料に残存するモノクローナル抗体量に比例して共役的に結合することにより、センサの電気化学インピーダンスの変化として測定する方式である。したがって、環境水中の他の潜在的な干渉物質の影響を受けにくいセンサであり、現場での検出・測定にも応用する可能性を秘めている。

    researchmap

  • Advancement of pollution control utilizing source apportionment of health risk factors from combined sewer overflows

    Grant number:24246090  2012.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)  The University of Tokyo

    FURUMAI Hiroaki, KATAYAMA Hiroyuki, KURISU Futoshi, KASUGA Ikuro

      More details

    Grant amount: \43420000 ( Direct Cost: \33400000 、 Indirect Cost: \10020000 )

    The purposes of this study are i) to quantify the pollutant loads derived from combined sewer overflow (CSO) and ii) to evaluate its impact on water quality in Odaiba surrounding waters. The research outcomes can contribute to control of fecal contamination in waterfront areas. We collected wet weather sewage and coastal water samples after rainfall event. Then we investigated presence and fate of pathogenic microorganisms, including viruses. We performed water quality predictions by 3-dimensional coastal water quality model, giving CSO pollutant load conditions. Then we assessed the fecal contamination and discussed its control in Odaiba surrounding waters.

    researchmap

  • Investigation on health-related microbial pollution during inundation in Hanoi and Hue linking to water accessibility

    Grant number:23404016  2011.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)  The University of Tokyo

    FURUMAI Hiroaki, KATAYAMA Hiroyuki, KASUGA Ikuro

      More details

    Grant amount: \18980000 ( Direct Cost: \14600000 、 Indirect Cost: \4380000 )

    Situations on inundation and microbial pollution were investigated in Hue Citadel area during wet season by continuous monitoring of water level and electric conductivity as well as water sampling and its analysis. Advanced urban inundation model was developed through elaboration on ground elevation, connection of channels and ponds, and setting-up of imperviousness using satellite image data. The model was successfully utilized to reproduce a past inundation situation and to evaluate vulnerable districts for inundation. Questionnaire and interview survey was also conducted to obtain status of water accessibility and exposure to pathogens by face-to-face interviewing to local nurses and mothers.

    researchmap

  • Development of evaluation approach for behaviors of health risk factors derived from combined sewer overflow

    Grant number:21246084  2009 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)  The University of Tokyo

    FURUMAI Hiroaki, KATAYAMA Hiroyuki, KURISU Futoshi, KASUGA Ikuro, KOIBUCHI Yukio, TAKADA Hideshige, NIHEI Yasuo

      More details

    Grant amount: \39520000 ( Direct Cost: \30400000 、 Indirect Cost: \9120000 )

    The objective of this study is to evaluate the effect of pollutant load derived from combined sewer overflow(CSO) on water quality in urban coastal area after rainfall event. Then, evaluation technique of health risk in water amenity area, such as Odaiba, was developed. Based on various results of urban runoff analysis, the CSO occurrence was characterized by categorized rainfall pattern. It is possible to predict the behavior of E. coli in Odaiba area by 3-dimentional water quality model in which the tidal effect and pollutant loads from pumping station and waste water treatment plant were considered.

    researchmap

  • Analysis of behaviors of nonregulated risk factors derived from combined sewer overflow in receiving water bodies

    Grant number:19360238  2007 - 2008

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)  The University of Tokyo

    FURUMAI Hiroaki, KURISU Futoshi, KATAYAMA Hiroyuki, KOIBUCHI Yukio, FUJITA Masafumi, KASUGA Ikuro, MASUNAGA Shigeki

      More details

    Grant amount: \16640000 ( Direct Cost: \12800000 、 Indirect Cost: \3840000 )

    researchmap

  • 雨天時都市流出水中の生物利用性重金属と水生生物への毒性評価

    Grant number:05F05379  2005 - 2007

    日本学術振興会  科学研究費助成事業  特別研究員奨励費  東京大学

    古米 弘明, AUNG Nyein Nyein

      More details

    Grant amount: \2400000 ( Direct Cost: \2400000 )

    平成18年度春の下水処理場における重金属の動態調査の結果、全亜鉛の40%が生態毒性の高い自由イオンで存在し、処理工程でほとんど除去されていないということが明らかになった。今年度は、下水処理工程における重金属動態の再現性と季節による除去特性の違いについて考察した。
    平成18年度と同じ下水処理場を対象として、平成19年度夏に処理工程における重金属の除去特性と存在形態を調査した。下水処理場内の4箇所(流入水、初沈越流水、終沈越流水、砂ろ過水)に、DGT(DiflUsion Gradient in Thinfilms)を24時間浸漬し、重金属を形態別に分析した。また、流入水については日中(10時-17時)に1時間間隔で、初沈・終沈越流水については終日1時間間隔で、砂ろ過水は終日2時間間隔で採水を行った。分析対象は、Ni,Cu,Zn,Pbとした。
    夏の調査では、砂ろ過水中のNi,Cu,Znの全濃度が、流入水中の全濃度の約半分に減少しており、これらの重金属類が処理工程で除去されていることが示された。また、時間変動の調査結果から、流入水における溶存態重金属の割合は、平均してNiが57%、Cuが20%、Znが15%であった。Pbは、夏の調査では検出限界以下であった。Niは溶存態、不安定形態ともに処理工程でほとんど濃度が変化しなかった。Cuは、春の調査では流入水中、処理水中ではほとんどが安定錯体として存在していたが、夏の調査では流入水中、処理水中ともに不安定形態のCuも存在していた。Znについては、春、夏ともに、不安定形態の濃度は処理工程でほとんど変化しないという共通点が見られたが、流入水中の溶存態に占める不安定形態の割合は、春よりも夏の方が低かった。これらの季節的な差異がどのような要因に由来しているのか、今後更に研究を進める必要がある。

    researchmap

  • リスク管理型都市水循環系の構造と機能の定量化

    2002 - 2007

    JST戦略的創造研究推進制度(研究チーム型) (戦略的基礎研究推進事業:CREST) 

      More details

    Grant type:Competitive

    researchmap

  • Risk-based management of self-regulated urban water recycle and reuse systems

    2002 - 2007

    JST Basic Research Programs (Core Research for Evolutional Science and Technology :CREST) 

      More details

    Grant type:Competitive

    researchmap

  • Wet weather behavior of unregulated pollutants and pathogens in combined sewer network

    Grant number:16360262  2004 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)  the University of Tokyo

    FURUMAI Hiroaki, NAKAJIMA Fumiyuki, KATAYAMA Hiroyuki, FUJITA Masafumi, KURISU Futoshi

      More details

    Grant amount: \14900000 ( Direct Cost: \14900000 )

    The aim of this research project was to unveil the wet weather behavior of unregulated micropollutants and pathogens derived from combined sewer overflow (CSO). Detailed field survey was conducted to characterize the diurnal variation of the pollutant loads, particle size distribution, quinone profile of suspended microbes, health related microorganisms including viruses and micropollutants such as antibiotics. The diurnal variation was categorized into several patterns dependent on the pollutant source. The variation of antibiotics concentration seemed to reflect the metabolism and excretion characteristics of each antibiotic.
    To investigate the phenomenon of resuspension of pipe sediment under wet weather condition, the rainwater runoff was simulated by pouring clean water into an upstream manhole from a water wagon. Loads of bacteria in the downstream pipe exhibited a different varying pattern from that of viruses.
    A mathematical modeling was conducted to evaluate the sediment distribution in a combined sewer network and then a protocol to distinguish the priority pipes for cleaning was proposed. A model simulation revealed that cleaning of pipes which specifically accumulated sediments was effective for reducing the CSO pollutant load.
    Algorithm of sewer system operation to minimize the CSO pollutant load was developed. A simple auto-regression model for on-line water quality prediction was modified with referring a measured water quality value in an upstream pipe. Water flow prediction model was refined to provide a better simulation of CSO occurrence at medium- and small-size rainfall events. Future application of the algorithm to a real time control system for CSO management was discussed.

    researchmap

  • 湖沼微生物群の芳香環開裂酵素機能遺伝子プロファイリングに基づく有機物の特性評価

    Grant number:17651042  2005    

    日本学術振興会  科学研究費助成事業  萌芽研究  東京大学

    古米 弘明, 中島 典之

      More details

    Grant amount: \3400000 ( Direct Cost: \3400000 )

    起源の異なる溶存有機物(DOM)を湖沼水(印旛沼)に添加した生分解実験を行った。暗所、25℃で10日間培養し、培養過程の試料から核酸を抽出し、芳香環開裂酵素機能遺伝子であるC230遺伝子を増幅するプライマーを用いてPCRを行った。C23O遺伝子が検出された試料から、クローンライブラリーを構築し、塩基配列・アミノ酸配列を解析した。
    流入河川水DOMやアシ腐植質を添加した実験系で検出された2日後,10日後のC23O遺伝子について,クローンライブラリーを作成した。アミノ酸翻訳したところ,104種類のアミノ酸配列群が得られた。実験2日後のC23O遺伝子構成は,各実験系で明確に異なった。東部流入河川の鹿島川のDOMを添加した実験系では,Sphingomonas属などが有するC23O遺伝子に近縁な配列が50%近くを占めたのに対し,、西部流入河川の神崎川のDOMを添加じた実験系では,Ralstonia eutropha KN1株などが有するC23O遺伝子に近縁な配列が36%を占めた。アシ腐植質を添加した実験系では,Pseudomonas属などが有するC23O遺伝子に近縁な配列が全体の71%を占めた。10日後のC23O遺伝子構成は,2日後からさらに変化して,すべての実験系でRalstonia eutropha KN1株などのC23O遺伝子に近縁な配列群が優占した。この配列群は,系統解析により既存のC23O遺伝子の分類とは全く異なる新規のクラスターを形成した。特徴的なC23Oを有する細菌を単離することを試みたが、今回の実験系列からは目的の遺伝子を有する細菌は単離できなかった。
    このような優占C23O遺伝子構成の変遷過程は,起源の異なるDOMの生分解過程を反映していると考えられ、C23O遺伝子のプロファイリングにより、湖沼細菌群集の応答特性という視点からDOMの特性評価ができた。

    researchmap

  • 水中溶存有機物の組成解析のためのバイオレスポンスプレートの開発

    Grant number:15651027  2003 - 2004

    日本学術振興会  科学研究費助成事業  萌芽研究  東京大学

    古米 弘明, 中島 典之

      More details

    Grant amount: \3700000 ( Direct Cost: \3700000 )

    前年度の研究において,千葉県印旛沼流域から回収した起源の異なる有機物を湖沼水に添加した系から細菌を単離した。今年度は,これらの単離株を用いたバイオレスポンスプレートの試作を行い,溶存有機物解析への適用可能性を評価した。
    バイオレスポンスプレートは,酸化還元指示薬を予め添加したマルチプレートの各ウェルに,基質利用特性の異なる単離株を植種して作成した。各ウェルにろ過滅菌した試料を添加し,単離株が試料中の溶存有機物を利用して呼吸すると,酸化還元指示薬が赤く発色することから,その発色パターンに着目して,溶存有機物の特性を生物学的視点から評価することを試みた。
    まず,段階希釈したR2A培地を用い,バイオレスポンスプレートの感度を評価したところ,有機物濃度5mgC/lであっても良好な発色が得られた。しかし,RO膜濃縮した流入河川水試料(ウェル内濃度10mgC/l)では,(1)試料の添加によってウェル内に白色沈殿が生成し,低吸光度領域での測定が不安定になる,(2)対照系と試料添加系との差異が不明瞭,などの問題が生じた。白色沈殿は,濃縮試料中の硬度成分が,酸化還元試薬と反応して生成することが判明したため,陽イオン交換樹脂による脱塩で解決した。環境試料中の溶存有機物に対する単離株の呼吸活性を高めるために,細胞内貯蔵物質・細胞外ポリマーを消費させるスタベーションを事前に試みた。この結果,β-Proteobacteriaに属する一部の株では,環境試料に対する応答を検出できたが,全体的には呼吸活性は依然として弱く,流入河川水を添加した系列から単離した株であっても呼吸活性を示さない等の問題点が残った。
    今後の研究開発の方向性としては,単離株の代謝特性に基づいたバイオレスポンスプレートの改良と平行して,有機物利用に関わる機能遺伝子等に着目した遺伝子ベースのバイオレスポンスプレートの作成などが考えられる。

    researchmap

  • Microbial community analysis of enhanced biological phosphorus removal process and identification of polyphosphate accumulating organisms by molecular approach

    Grant number:14350283  2002 - 2003

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)  The University of Tokyo

    MINO Takashi, KURISU Futoshi, FURUMAI Hiroaki

      More details

    Grant amount: \15000000 ( Direct Cost: \15000000 )

    Fundamental research about enhanced biological phosphorus removal (EBPR) process is now making great progress because of the new microbial community analysis methods such as molecular techniques. This research was carried to reveal the relationship between microbial community and function of EBPR sludge using 16S-rDNA approach.
    In this research, at first, laboratory scale reactors were operated using acetate, glutamate, propionate, glucose or peptone as a main carbon source respectively. The expression of phosphorus removal activity was monitored by batch experiments and the microbial community change was monitored by Denaturing gradient gel electrophoresis (DGGE) using 16S-rDNA fragments. By comparing phosphorus removal activity and microbial community change, polyphosphate accumulating organisms were screened. In addition, by sequencing the whole length of 16S-rDNA of target bacteria by using cloning method and developing gene probes which can specifically detect the target bacteria and combining with the polyphosphate staining method and fluorescent in situ hybridization, capability of accumulating polyphosphate by screened bacteria was investigated.
    As a result, it was demonstratedd that gram-positive bacteria with high GC content accumulated polyphosphate in the reactor fed with mainly peptone and this gram positive bacteria was considered as the second putative polyphosphate accumulating organisms (PAOs) after Rhodocyclus related bacteria, which has been already considered as PAOs candidates. In addition, as another bacteria which accumulated polyphosphate but was not Rhodocyclus related bacteria nor gram positive bacteria was detected, it was clearly shown that still unknown PAOs should exist. In this way, it was shown that the EBPR is achieved by the combination of several PAOs

    researchmap

  • 道路交通系エミッションに伴う汚染動態の特性評価と管理手法の開発

    Grant number:14605019  2002    

    日本学術振興会  科学研究費助成事業  基盤研究(C)  東京大学

    古米 弘明, 高田 秀重, 田中 宏明, 小野 芳朗, 福士 謙介, 谷口 守

      More details

    Grant amount: \2400000 ( Direct Cost: \2400000 )

    道路交通系エミッションに伴う微量汚染物質の"Fate"を定量的に把握して、その水環境中への排出量や動態特性を踏まえた水域へのインパクト評価へつながる研究シナリオを議論した.
    研究会合は,当初は年間で二回開催を想定していたが,結果として7月3日,8月30日,11月5日,3月7日の計4回行い,さらに3月20日には公開のワークショップも東京大学にて開催した.
    研究会合においては,各研究者の専門分野における研究レビューを他の構成員に紹介することを通じて、他分野での新しいアプローチや解析手法の適用可能性の検討を行ない、研究プロジェクトシナリオの概念形成に関して論議を重点的に行った.特に多環芳香族炭化水素類に着目して、(1)道路交通系汚染物質インベントリー作成、(2)エミッションファクターの整理、(3)汚染物質の起源解析と排出過程調査手法、(4)雨天時汚濁負荷モデル解析手法、(5)都市交通と下水道システムとの相互関係評価、(6)ヒトや生態系への健康・毒性影響、(7)インパクト評価およびリスク管理指標の構築、(8)汚濁削減のための規制や管理・制御手法,などが議論の対象となった。これらの検討や議論を通じて、研究プロジェクト立ち上げに必要となる人的ネットワークや連携方法の検討、得られる研究成果の公表や情報発信のあり方についても議論した。
    公開のワークショップにおいては,「発生源特性と大気中挙動」「雨天時挙動と環境影響」という二つのセッションを設け,多環芳香族炭化水素に焦点をあてながらも道路交通由来の多様な汚染物質に関する最新の研究成果や今後の研究課題に関して議論を行った.研究分担者だけでなく,国内の他の研究者も招聘し,約50名の出席者を得た.個別の研究内容に関する討論だけでなく,今後のこの分野の研究の方向性や研究プロジェクトの推進の仕方について議論を深めた.

    researchmap

  • Microbial community analysis for evaluating water quality improvement in reservoirs installed with destratification system

    Grant number:13680638  2001 - 2002

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)  the University of Tokyo

    FURUMAI Hiroaki, NAKAJIMA Fumiyuki

      More details

    Grant amount: \3600000 ( Direct Cost: \3600000 )

    Seasonal change of microbial community including bacteria and algae in Tsukui Lake, where destratification system was installed, was investigated by denaturing gradient gel electrophoresis (DGGE) of polymerase chain reaction (PCR). In order to express graphically the seasonal change of the community based on the dissimilarity index, multi-dimensional scaling (MDS) was applied. The MDS map revealed a cyclic change of the community and a distinctive divergence from the path during a sudden algal bloom after a heavy storm. Since the divergence disappeared in an analysis excluding cyanobacteria, the major part of the community might be independent of the sudden algal bloom. Dissimilarity of microbial communities was much lower among three different sampling sites than among the sampling months.
    Excitation emission matrix spectroscopy (EEMS) and PCR-DGGE were applied to elucidate the relationship between production of dissolved organic matter (DOM) and bacterial community change during the lysis of algal bloom followed by their degradation in a batch incubation test. The lysis of the algal bloom collected from Tsukui Lake was indicated by rapid increases of dissolved organic carbon and UV absorbance at 260 nm within five days In accordance with the lysis, several fluorescence peaks derived from humic- and protein-like substances appeared in the EEM. Phylogenetic analysis of the major DGGE bands showed that bacteria closely related to y-Proteobacteria, CFB group and a-Proteobacteria probably played important roles in the lysis and degradation of algal bloom.
    The phenomena of algal lysis and DOM formation were investigated also in laboratory. Pure culture of Microcystis aeruginosa was inoculated into sterilized and non-sterilized Tsukui lake water. The existence of eubacteria differed the DOM formation after the algal lysis. The fluorescence derived from humic-like substances increased and subsequently decreased in the non-sterilized lake water, while such a variation was not observed in the sterilized water.

    researchmap

  • Evaluation of urban non-point pollution load by a distributed model considering roofs and roads as impervious surface

    Grant number:13555148  2001 - 2002

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)  the University of Tokyo

    FURUMAI Hiroaki, NAKAJIMA Fumiyuki, ARAMAKI Toshiya

      More details

    Grant amount: \1600000 ( Direct Cost: \1600000 )

    1. Development and validation of a non -point pollution load model considering roofs and roads as impervious surface
    Roofs and roads were considered in a non-point pollution load model as impervious surface. The importance of their different runoff characteristics was recognized in order to explain dynamic runoff behavior in an area with a separate sewer system. The runoff behavior of suspended solids was evaluated separately in two size fractions (l.2〜45μm and 45μm〜2mm). In order to fit the model simulation to the observed data, the concept of critical runoff rate for wash-off was introduced into the Sartor and Boyd model for explaining the different runoff behavior of fine and coarse particles. The simulated results with the modified Sartor and Boyd model agreed satisfactorily with the observed data for a series of seven rainfall events with weak rainfall intensities.
    To improve the model for better fitting of runoff behavior in heavy rains, wash-off models from pervious area were additionally proposed. Introduction of the wash-off functions for previous surface as well as the modified Sartor and Boyd model for impervious surface, the simulation results could agree with the observed data even in the heavy rainfall events.
    A method was developed for estimation of the fractions of roof and road surfaces in target drainages. The detailed land use data given in 10m grid basis was utilized to estimate their fractions. Once the roof and road surface fractions were given, it became easy to determine the runoff parameter values. The validity of the method was confirmed in four cities.
    2. Characterization of micropollutants in the dust of roof and road
    Polycyclic aromatic hydrocarbons on the dust of roof and road were analyzed. The result of cluster analysis based on the profiles of the micropollutants showed a clear difference between road dust and roof dust in a district. But in the case of comparing the two districts having different pollution loading from non-traffic pollutant sources, the charasteristics of the micropollutant profile was depending much more on the characteristics of the district than the surface property.

    researchmap

  • 都市における新たな環境リスクの予測・評価・低減に関する工学システムの企画調査

    Grant number:13895011  2001    

    日本学術振興会  科学研究費助成事業  基盤研究(C)  東北学院大学

    遠藤 銀朗, 津野 洋, 大村 達夫, 大垣 眞一郎, 古米 弘明, 原田 秀樹

      More details

    Grant amount: \3200000 ( Direct Cost: \3200000 )

    本企画調査では、4回に亘って研究企画打ち合わせ会議を開催し、21世紀の都市において重大化すると予測されるまた新たに出現すると予測される環境リスクについて、人間社会に必要不可欠な環境リスク評価システムとリスク回避技術体系の確立を目的とする特定領域研究の研究戦略を立案した。
    また本企画調査では、平成14年度科学研究費補助金「特定領域研究」への研究課題申請を具体的に進めるために、研究者間情報ネットワークの確立、共同研究組織の確立、およびこのような研究組織の統括および研究推進体制を構築した。
    本企画調査において最終的に決定した特定領域の申請課題は、「水媒体質研究-複合衛生危機の回避のために」であった。「水媒体」とそれにおける「衛生危機」に研究領域を特定して、21世紀における人類と生態系の存続に危機を与える微生物群、化学物質群の、水媒体からの検出、定量、評価、除去、挙動解明、無割化に関する学術領域の創造を目指すことを企画した。この特定領域研究を構成する重要研究課題として、以下の5課題を決定した。
    ・健康リスク微生物群の高感度検出・定量および除去
    ・衛生危機化学物質の多面的検出技術の開発
    ・バイオレスポンス評価による衛生危機化学物質の管理
    ・衛生危機因子の環境動態把握と解析
    ・衛生危機因子の複合曝露解所とリスク評価

    researchmap

  • 循環曝気法を導入した貯水池における水質改善評価のための微生物群集構造解析

    Grant number:12680562  2000    

    日本学術振興会  科学研究費助成事業  基盤研究(C)  東京大学

    古米 弘明

      More details

    Grant amount: \2400000 ( Direct Cost: \2400000 )

    researchmap

  • 大気及び道路面からの多環芳香族化合物の雨天時流出汚濁負荷量の評価手法

    Grant number:11558070  1999 - 2000

    日本学術振興会  科学研究費助成事業  基盤研究(B)  東京大学

    古米 弘明, 中島 典之, 荒巻 俊也

      More details

    Grant amount: \4900000 ( Direct Cost: \4900000 )

    近年、大気系負荷、降雨含有負荷、路面・屋根などへの堆積負荷由来の微量汚染物質によるディフューズポリューションが、公共用水域の水質汚染や水域生態系への影響として相対的に大きくなっている。これらノンポイント汚染負荷の晴天時堆積及び雨天時流出の挙動は、降雨強度、晴天時継続日数、土地利用、地表面タイプなど様々な要因に支配されるため、その定量化は非常に難しい。現在、地表面の水文学的モデル及び下水管内水理モデルを組み合わせることによりノンポイントの雨天時汚濁負荷を定量的に評価可能な分布型モデルが開発されてきており、従来の集