Updated on 2024/04/30

写真a

 
YAMAMURA Hiroshi
 
Organization
Faculty of Science and Engineering Professor
Other responsible organization
Civil, Human and Environmental Science and Engineering Course of Graduate School of Science and Engineering, Master's Program
Civil, Human and Environmental Science and Engineering Course of Graduate School of Science and Engineering, Doctoral Program
Contact information
The inquiry by e-mail is 《here
External link

Degree

  • 博士(工学) ( 北海道大学 )

  • 修士(工学) ( 北海道大学 )

Education

  • 2009.3
     

    Hokkaido University   others   completed

  • 2008.3
     

    Hokkaido University   Graduate School, Division of Engineering   doctor course   completed

  • 2006.3
     

    Hokkaido University   Graduate School, Division of Engineering   master course   completed

  • 2004.3
     

    Hokkaido University   Faculty of Engineering   graduated

  • 1999.3
     

    香川県立丸亀高等学校   graduated

Research History

  • 2020.4 - Now

    Chuo University   Professor

  • 2015.4 - 2020.3

    Chuo University   Dept. of Science and Engineering   Associate Professor

  • 2013.4 - 2015.3

    中央大学理工学部助教

  • 2012.4 - 2015.3

    Chuo University   Dept. of Science and Engineering   Assistant Prof.

  • 2009.4 - 2012.3

    旭化成ケミカルズ膜・水処理事業部マイクローザ技術開発部研究員

  • 2011.4 - 2011.8

    中央大学理工学部非常勤講師

  • 2008.4 - 2009.3

    北海道大学環境ナノ・バイオ工学研究センター博士研究員

  • 2006.4 - 2008.3

    日本学術振興会特別研究員(DC1)

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Professional Memberships

  • 日本土木学会(東京都新宿区)

  • 日本土木学会

  • IWA(イギリス・ロンドン)

  • 日本水環境学会(東京都江東区)

  • 日本膜学会(東京都文京区)

  • JAPANESE HUMIC SUBSTANCES SOCIETY

  • THE SOCIETY OF POLYMER SCIENCE, JAPAN

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Research Interests

  • Phosphate recovery

  • Digital water

  • Drinking water treatment

  • Waste water treatment

  • Biofuel production

  • 用排水処理

  • Harvesting of micro algae

  • Membrane filtration

  • Seawater Desalination

Research Areas

  • Environmental Science/Agriculture Science / Environmental load reduction and remediation  / 環境技術・環境負荷低減

  • Environmental Science/Agriculture Science / Sound material-cycle social systems  / Design and evaluation of sustainable and environmental conscious system

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

  • Environmental Science/Agriculture Science / Environmental materials and recycle technology

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Environmental systems for civil engineering  / 土木環境システム

Papers

  • Important properties of anion exchange resins for efficient removal of PFOS and PFOA from groundwater Reviewed

    Shahanaz Parvin, Hiroe Hara-Yamamura, Yuma Kanai, Aki Yamasaki, Tadashi Adachi, Sovannlaksmy Sorn, Ryo Honda, Hiroshi Yamamura

    Chemosphere   2023.11

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    DOI: 10.1016/j.chemosphere.2023.139983

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  • Quantification of organic fluorophores in absorbing media by solid-phase fluorescence excitation–emission matrix (SPF-EEM) spectroscopy of modeled mixtures containing bovine serum albumin (BSA) and colorants

    Yuki Nakaya, Ayaka Tomita, Kosuke Ochiai, Hiroshi Yamamura

    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy   285   121885 - 121885   2023.1

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    DOI: 10.1016/j.saa.2022.121885

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  • Rejection of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) by severely chlorine damaged RO membranes with different salt rejection ratios Reviewed

    Hiroe Hara-Yamamura, Koki Inoue, Tomoaki Matsumoto, Ryo Honda, Kazuaki Ninomiya, Hiroshi Yamamura

    Chemical Engineering Journal   446   2022.10

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    Removal of per- and polyfluoroalkyl substances (PFAS) from water use cycles has now become an urgent task due to their wide spread in water environment and associated adverse health effects. Despite the effectiveness of nanofiltration (NF) and reverse osmosis (RO) for PFAS removal, the high cost related to the high pressure operation and membrane replacement mostly limit the application in the actual drinking water treatment. In this study, we investigated the rejection of the two most typical PFAS, perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) by the chlorine treated RO membranes (Dow FILMTEC™ SW30HR) with five different salt rejection ratios from 12% to 66%, which simulated the used membranes upgraded for the permeability. The damaged membranes were further characterized for their contact angle and zeta potential, and elemental composition was analyzed by X-ray photoelectron spectroscopy. The lab-scale cross-flow filtration tests demonstrated that the damaged RO membranes with 39 ∼ 66% salt rejection ratios achieved over 85% rejection of both PFOA and PFOS, which was comparable or even superior performance to that previously reported for NF membranes. Characterization of damaged membranes suggested that electrostatic repulsion and size exclusion both played an important role in the rejection of PFOA and PFOS by the damaged membrane. The present study provides new insights into the energy-efficient and material-saving, thereby economically sustainable, membrane process for the removal of the legacy PFAS.

    DOI: 10.1016/j.cej.2022.137398

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  • Application of 1.0-μm macroporous hollow fiber membrane for prevention of membrane fouling and enhancement of permeate flux in algae harvesting Reviewed

    Hiroshi Yamamura, Takaki Matsumoto, Keisuke Goto, Qing Ding, Miho Kuroiwa, Shigeaki Harayama

    Bioresource Technology Reports   17   2022.2

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    We challenged to introduce macroporous membrane for algae harvesting with a permeate flux of 166 L m−2 d−1 to achieve significant reduction of harvesting cost. Analysis of the dissolved organic matter in the supernatant of cultures of the green alga, Coccomyxa sp. strain Obi, detected a scarce amount of hydrophilic macromolecules, which can be membrane fouling agents. The continuous filtration with a macroporous membrane achieved a 30-fold concentration of algal cells from 800 mg biomass/L to 24,000 mg biomass/L with a harvesting efficiency of 100%. Most of previous studies on the membrane filtration for harvesting microalgae merely utilized microfiltration membranes developed for wastewater treatment. However, the use of a membrane of the largest pore size that microalgal cells cannot seep through will result in slower fouling, higher flux, and a great reduction of harvesting cost.

    DOI: 10.1016/j.biteb.2021.100895

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  • PREDICTIVE MODELS OF RESIDUAL CHLLORINE CONCENTRATION IN WATER DISTRIBUTION SYSTEMS BY LONG-TERM MEMORY NETWORKS

    山村寛, 石井崇晃, 小野一樹, 市川学, 清塚雅彦

    土木学会論文集 G(環境)(Web)   77 ( 7 )   2021

  • PREDICTIVE MODEL OF 2-MIB AND GEOSMIN CONCENTRATIONS IN A RIVER WATER BY FEED FORWARD ARTIFICIAL NEURAL NETWORK AND LONG SHORT-TERM MEMORY NETWORK INPUTTING HOURLY WATER QUALITY DATA

    石井崇晃, 山村寛, 根本雄一

    土木学会論文集 G(環境)(Web)   77 ( 7 )   2021

  • In situ and online monitoring of the chemical cleaning efficiency by solid-phase fluorescence excitation–emission matrix spectroscopy (SPF-EEM) Reviewed

    Qing Ding, Kosuke Ochiai, Hiroshi Yamamura

    Journal of Membrane Science   611   2020.10

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    Membrane fouling is still a significant drawback of membrane technology. Irreversible fouling can be alleviated only by chemical cleaning. Guidelines for determining the methods and efficiency of chemical cleaning, such as those for timing and chemical category, are still not available because of the lack of knowledge about foulants during membrane filtration. In this study, a new in situ observation method, i.e., three-dimensional solid-phase fluorescence excitation–emission matrix spectroscopy (SPF-EEM), was used to characterise the chemical cleaning efficiency of irreversible fouling. Caustic, acidic and hypochlorite chemical solutions were tested as cleaning agents used in different sequences. Progression trends of irreversible fouling were then characterised by in situ and online SPF-EEM. Chemical cleaning efficiency observed by SPF-EEM was consistent with that observed by conventional infrared spectroscopy analysis, which only can be conducted ex situ. By performing SPF-EEM analysis, the optimal chemical cleaning procedure, which exhibited a result consistent with that obtained for the recovery of pure water permeability, could be determined. Hence, SPF-EEM is effective for the in situ characterisation of irreversible fouling, and it is beneficial for the determination of the timing and chemical category for cleaning based on the SPF-EEM of foulants.

    DOI: 10.1016/j.memsci.2020.118296

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  • Dosage optimization of polyaluminum chloride by the application of convolutional neural network to the floc images captured in jar tests Reviewed

    Hiroshi Yamamura, Eryanti Utami Putri, Takashi Kawakami, Akihiro Suzuki, Herto Dwi Ariesyady, Takaaki Ishii

    Separation and Purification Technology   237   116467 - 116467   2020.4

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    The optimization of the coagulation of floc remains challenging because it is affected by various factors, including the pH, turbidity, and alkalinity. A jar test is a reliable method to optimize the coagulation conditions; however, it is time-consuming and requires an experienced technician. A convolutional neural network (CNN) can be used to extract the specific image characteristics via learning processes to construct image classification models. In this study, we applied a CNN for predicting the jar test performance. Artificial water adjusted with kaolin and commercial humic acid was initially used. The floc image was recorded using a video camera during the jar test, and models for predicting the turbidity of the supernatants were constructed by inputting the recorded floc images and the level of turbidity as the training dataset. The learning curve denoted that all the models exhibited 100% accuracy during the learning process, clearly indicating that the CNN worked appropriately with respect to the extraction of the characteristics of the floc images and the determination of their settleability. Subsequently, the overfitting level was investigated by inputting the test data into the models. The maximum prediction accuracy of all the models exceeded 96%. The initial 100 s of the model's learning of the floc images achieved a maximum accuracy of 99.6%, i.e., the images captured during rapid mixing were sufficient to ensure the reliability of the model. The applicability of the model to natural water samples was also investigated using samples obtained during different months. Even though the accuracy for natural water was lower than that for artificial water, 90% accuracy was achieved even when fluctuating natural water was used, demonstrating the applicability of a CNN to extract the characteristics of the floc governing its settleability and to immediately as well as automatically predict the state of coagulation.

    DOI: 10.1016/j.seppur.2019.116467

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  • Solid-phase fluorescence excitation emission matrix for in-situ monitoring of membrane fouling during microfiltration using a polyvinylidene fluoride hollow fiber membrane Reviewed

    Hiroshi Yamamura, Qing Ding, Yoshimasa Watanabe

    Water Research   164   114928 - 114928   2019.11

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    DOI: 10.1016/j.watres.2019.114928

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  • Characteristics of meso-particles formed in coagulation process causing irreversible membrane fouling in the coagulation-microfiltration water treatment Reviewed

    Q. Ding, H. Yamamura, N. Murata, N. Aoki, H. Yonekawa, A. Hafuka, Y. Watanabe

    WATER RESEARCH   101   127 - 136   2016.9

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    In coagulation-membrane filtration water treatment processes, it is still difficult to determine the optimal coagulation condition to minimize irreversible membrane fouling. In microfiltration (MF), mesa particles (i.e., 20 nm-0.5 mu m) are thought to play an important role in irreversible membrane fouling, especially their characteristics of particle number (PN) and zeta potential (ZP). In this study, a new nanoparticle tracker combined a high-output violet laser with a microscope was developed to identify the physicochemical characteristics of these microscopic and widely dispersed meso-particles. The effects of pH and coagulant dose on ZP and PN of micro-particles (i.e., >0.5 mu m) and meso-particles were investigated, and then coagulation-MF tests were conducted. As the result, irreversible membrane fouling was best controlled for both types of membranes, while meso-particle ZP approached zero at around pH 5.5 for both types of natural water. Since PN was greatest under these conditions, ZP is more important in determining the extent of irreversible membrane fouling than PN. However, the acidic condition to neutralize meso-particles is not suitable for actual operation, as considering residual aluminum concentration, pipe corrosion, and chlorination efficiency. It is therefore necessary to investigate coagulants or other methods for the appropriate modification of meso-particle characteristics. (C) 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

    DOI: 10.1016/j.watres.2016.05.076

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  • Hydrophilic fraction of natural organic matter causing irreversible fouling of microfiltration and ultrafiltration membranes Reviewed

    Hiroshi Yamamura, Kenji Okimoto, Katsuki Kimura, Yoshimasa Watanabe

    WATER RESEARCH   54   123 - 136   2014.5

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    Although membrane filtration is a promising technology in the field of drinking water treatment, persistent membrane fouling remains a major disadvantage. For more efficient operation, causative agents of membrane fouling need to be identified. Membrane fouling can be classified into physically reversible and irreversible fouling on basis of the removability of the foulants by physical cleaning. Four types of natural organic matter (NOM) in river water used as a source of drinking water were fractionated into hydrophobic and hydrophilic fractions, and their potential to develop irreversible membrane fouling was evaluated by a bench-scale filtration experiment together with spectroscopic and chromatographic analyses. In this study, only dissolved NOM was investigated without consideration of interactions of NOM fractions with particulate matter. Results demonstrated that despite identical total organic carbon (TOC), fouling development trends were significantly different between hydrophilic and hydrophobic fractions. The hydrophobic fractions did not increase membrane resistance, while the hydrophilic fractions caused severe loss of membrane permeability. These results were identical with the case when the calcium was added to hydrophobic and hydrophilic fractions. The largest difference in NOM characteristics between hydrophobic and hydrophilic fractions was the presence or absence of macromolecules; the primary constituent causing irreversible fouling was inferred to be "biopolymers", including carbohydrates and proteins. In addition, the results demonstrated that the extent of irreversible fouling was considerably different depending on the combination of membrane materials and NOM characteristics. Despite identical nominal pore size (0.1 mu m), a polyvinylidene fluoride (PVDF) membrane was found to be more rapidly fouled than a PE membrane. This is probably explained by the generation of strong hydrogen bonding between hydroxyl groups of biopolymers and fluorine of the PVDF membrane. On the basis of these findings, it was suggested that the higher fouling potential of the hydrophilic fraction of the dissolved NOMs from various natural water sources are mainly attributed to macromolecules, or biopolymers. (C) 2014 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.watres.2014.01.024

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  • Affinity of functional groups for membrane surfaces: Implications for physically irreversible fouling Reviewed

    Hiroshi Yamamura, Katsuki Kimura, Takaharu Okajima, Hiroshi Tokumoto, Yoshimasa Watanabe

    ENVIRONMENTAL SCIENCE & TECHNOLOGY   42 ( 14 )   5310 - 5315   2008.7

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    Fouling in membranes used for water treatment has been attributed to the presence of natural organic matter (NOM) in water. There have been reports recently on the contribution of hydrophilic fractions of NOM(e.g., carbohydrate-like substances) to fouling, but there is still little information about the physicochemical interactions between membranes and carbohydrate-like substances. In this study, the affinity of carbohydrate-like substances to two different microfiltration (MF) membranes was investigated by using atomic force microscopy (AFM) and functionally modified microspheres. Microspheres were attached to the tip of the cantilever in an AFM apparatus and the adhesion forces working between the microspheres and the membranes were determined. The microspheres used in this study were coated with either hydroxyl groups or carboxyl groups to be used as surrogates of carbohydrate-like substances or humic acid, respectively. Measurements of adhesion force were carried out at pH of 6.8 and the experimental results demonstrated that the adhesion force to membranes was strong in the case of hydroxyl groups but weak in the case of carboxyl groups. The strong adhesion between the hydroxyl group and the membrane surface is explained by the strong hydrogen bond generated. It was also found that the affinity of the hydroxyl group to a polyvinylidenefluoride (PVDF) membrane was much higher than that to a polyethylene (PE) membrane, possibly due to the high electronegative nature of the PVDF polymer. The time course of changes in the affinity of hydroxyl group to a membrane used in a practical condition was investigated by repeatedly carrying out AFM force measurements with PE membrane specimens sampled from a pilot plant operated at an existing water treatment plant. Microspheres exhibited strong affinity to the membrane at the initial stage of operation (within 5 days), but subsequently exponential reduction of the affinity was seen until the end of operation, as a result of fouling development. However, the magnitude of affinity of hydroxyl-modified microspheres was much higher than that of carboxyl-modified microspheres even after the significant reduction of affinity of hydroxyl-modified microspheres to the membranes was seen. The results obtained in this study partially explain why hydrophilic NOM dominated over humic substances in foulants of membranes used for water treatment in recent studies on fouling.

    DOI: 10.1021/es800406j

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  • Mechanism involved in the evolution of physically irreversible fouling in microfiltration and ultrafiltration membranes used for drinking water treatment Reviewed

    Hiroshi Yamamura, Katsuki Kimura, Yoshimasa Watanabe

    ENVIRONMENTAL SCIENCE & TECHNOLOGY   41 ( 19 )   6789 - 6794   2007.10

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    Control of membrane fouling is important for more efficient use of membranes in water treatment. Control of physically irreversible fouling, which is defined as fouling that requires chemical cleaning to be cancelled, is particularly important for reduction of operation cost in a membrane process. In this study, a long-term filtration experiment using three different types of MF and UF membranes was carried out at an existing water purification plant, and the evolution of physically irreversible fouling was investigated. The experimental results demonstrated that the extent of physically irreversible fouling differed significantly depending on the membrane type. Cleaning of the fouled membranes with various chemical reagents demonstrated that organic matter was mainly responsible for physically irreversible fouling. Organic matter that had caused physically irreversible fouling in the long-term operation was desorbed from the fouled membranes and was subjected to Fourier transform infrared and C-13 nuclear magnetic resonance analyses. These analyses revealed that carbohydrates were dominant in the membrane foulant regardless of the type of membrane. Based on measurements of molecular weight distribution of organic matter in the feedwater and the permeates from the membranes, a two-step fouling mechanism is proposed to explain the dominance of carbohydrates in the foulant: hydrophobic (humic-like) components with small molecular weight are first adsorbed on the membrane and, consequently, narrow the size of micro-pores of membranes, and then hydrophilic (carbohydrate-like) compounds with larger molecular weight plug the narrowed pores or the hydrophilic compounds are adsorbed onto the membrane surface conditioned by the hydrophobic components.

    DOI: 10.1021/es0629054

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  • Transition in fouling mechanism in microfiltration of a surface water Reviewed

    Hiroshi Yamamura, Soryong Chae, Katsuki Kimura, Yoshimasa Watanabe

    WATER RESEARCH   41 ( 17 )   3812 - 3822   2007.9

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    The main disadvantage of membrane filtration is membrane fouling, which remains as the major obstacle for more efficient use of this technology. Information about the constituents that cause fouling is indispensable for more efficient operation. We examined the changes in both foulant characteristics and membrane morphology by performing the pilot-scale filtration test using one microfiltration membrane. During the operation, we cut the membrane fibers three times, and the components that caused irreversible fouling were extracted by acid or alkaline solution. We found that the characteristic of inorganic matter extracted by acid solution completely differed depending on the filtration period. A large amount of iron was extracted in the second chemical cleaning, while manganese was the dominant component of the extracted inorganic matter in the third chemical cleaning. The analysis of Fourier transform infrared (FTIR) and cross polarization magic angle spinning carbon-13 (CPMAS C-13) nuclear magnetic resonance (NMR) demonstrated that the contribution of humic substances and carbohydrate in the organic foulant had increased as fouling developed. The changes in the major foulant have no relation with the fluctuation in feed water. The analysis of membrane morphology illustrated that the cake layer started to build up after the blockage of membrane pores. Based on the above results, we hypothesized the following fouling mechanism: the pores were covered or narrowed with relatively large particles such as iron, carbohydrate or protein; small particles such as manganese or humic substances blocked the narrowed pores; and finally an irreversible cake layer started to build up on the membrane surface. (c) 2007 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.watres.2007.05.060

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  • DEVELOPMENT OF NOVEL CARACTERIZATION METHID FOR HUMIC SUBSTRANCES BY USING ULTRAFAST-SCANNING SPECTROFLUOROMETER Reviewed

    Hiroshi YAMAMURA, Haruki NAKANO, Yuta YAMAMOTO

    79 ( 25 )   1 - 9   2023.9

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  • 最近の下水道研究の動向-米国WEFのレビューから-

    長岡洋斗, 成島正昭, 内藤純一郎, 飯野洸, 齊藤英幸, 武藤将弘, 有福友則, 小森陽昇, 角田貴之, 山村寛, 宮野翔馬, 熊越瑛

    下水道協会誌   60 ( 730 )   2023

  • A Study of Prediction of Turbidity after Flocculation Considering Seasonality from Flock Images from a Small Flocculation Plant

    鈴木昭弘, 川上敬, 山村寛, 根本雄一, 松川瞬

    情報科学技術フォーラム講演論文集   22nd   2023

  • 浄水プロセス制御を目的とした深層学習によるフロック画像からの凝集後濁度予測に関する研究

    鈴木 昭弘, 川上 敬, 山村 寛, Eryanti UTAMI PUTRI, 根本 雄一, 大江 亮介

    計測自動制御学会論文集 = Transactions of the Society of Instrument and Control Engineers   58 ( 5 )   271 - 280   2022.5

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  • 浄水プロセス制御を目的とした深層学習によるフロック画像からの凝集後濁度予測に関する研究

    鈴木 昭弘, 川上 敬, 山村 寛, UTAMI PUTRI Eryanti, 根本 雄一, 大江 亮介

    計測自動制御学会論文集   58 ( 5 )   271 - 280   2022

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    Language:Japanese   Publisher:公益社団法人 計測自動制御学会  

    <p>The objective of this paper is to predict the turbidity after flocculation from floc images in jar-test deep convolutional neural network (DCNN). Our goal is to develop a system to control the water purification process using the predictive model. In conventional studies, chemical parameters such as pH and alkalinity are generally used to predict turbidity. However, our proposed method does not use chemical parameters. It uses images of floating matter, called “floc”, generated during the flocculation process as input to the DCNN. We performed experiments using DCNN to predict turbidity after flocculation from images of “flocs” generated in jar-tests. We used VGG-16 as the DCNN for our experiments. Furthermore, we conducted experiments to compare the proposed method with the baseline method using chemical parameters.</p><p>As a result, 1) we revealed that the turbidity after flocculation can be predicted by using the image during flocculation as input to VGG-16; 2) we revealed that the optimal period to be used for the prediction model was the data 200 second after the start of the jar-tests; 3) we revealed that our proposed method can predict turbidity with better accur

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  • DEEP SVDD BASED MODELING OF FLUORESCENCE FEATURE OF DRINKING WATERS FOR EVALUATION OF RECLAIMED WATER QUALITY Reviewed

    Kyohei OTANI, Hiroe HARA-YAMAMURA, Hiroshi YAMAMURA, Ryoko YAMAMOTO-IKEMOTO, Ryo HONDA

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)   78 ( 7 )   III_73 - III_80   2022

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/jscejer.78.7_iii_73

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  • 水道の基盤強化に資する技術の水道システムへの実装に向けた研究 ビッグデータに基づく水質変動の早期予測手法の検討

    山村寛

    水道の基盤強化に資する技術の水道システムへの実装に向けた研究 令和3年度 総括・分担研究報告書(Web)   2022

  • Characterization of the surface degraded layer of polymers using an indentation method

    Fumika Nishimori, Daiki Ikeshima, Kohei Kanamori, Hiroshi Yamamura, Akio Yonezu

    Materials Today Communications   26   2021.3

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    In this study, we have proposed an indentation method to characterize a surface degraded layer due to UV light irradiation of polymers. Here, we assume that the degraded layer has a homogeneous and isotropic nature, and that the target material is a bilayer system (i.e., the degraded layer is formed on the substrate of the non-degraded base material). This method enables the quantitative measurement of mechanical properties (Young's modulus E and yield strength σY) and thickness of the degraded layer. In the first step, we conducted a shallow indentation in order to ignore the effect of substrate (non-degraded base material). This method deduces the mechanical property of degraded layer itself. The second step is deep indentation (i.e. indentation depth is deeper to capture substrate effect) for measuring the thickness of the degraded layer. To establish these methods, reverse analysis with the dimensionless function was newly proposed. We conducted a parametric study using the finite element method, in which the material cases cover various polymers, degradation properties, and layer thickness. Experimental verification was finally carried out, and the degraded layer due to UV light for polycarbonate (PC) was successfully characterized. Because this method is simple, convenient, and non-destructive, it might be useful for characterization of weathering degradation in other engineering polymers.

    DOI: 10.1016/j.mtcomm.2020.101873

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  • 膜とAIのスマートな関係 : 膜が夢見るグランドメニューへの登録

    山村 寛

    水環境学会誌   44 ( 2 )   38 - 43   2021.2

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  • 文献レビュー 低炭素化

    熊越瑛, 工藤祥子, 日下部包, 小川真樹, 飛野智宏, 細谷琢磨, 山村寛, 宮野充司

    下水道協会誌   58 ( 710 )   2021

  • A Study on a Method for Improving the Prediction Accuracy of Turbidity after Flocculation using Deep Learning from Floc Images in Water Treatment Proces

    鈴木昭弘, 川上敬, 山村寛, 根本雄一, 大江亮介

    情報科学技術フォーラム講演論文集   20th   2021

  • 超高温汚泥炭化物の市場流通に向けた機能性評価

    小泉 文佳, 山村 寛, 奥田 啓司, 渡辺 義公, 北林 誠, 加藤 正士

    下水道研究発表会講演集   58   878 - 880   2021

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  • コロナ禍による水循環への影響

    山村 寛, 中村 晋一郎

    水環境学会誌   43 ( 12 )   421 - 423   2020.12

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  • 環境技術思想 : 持続可能な社会に向かって(第5講)"私の世代"の使命と都市水インフラの到達目標

    山村 寛

    月刊下水道 = Journal of sewerage, monthly / 「月刊下水道」編集部 編   43 ( 13 )   99 - 103   2020.11

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  • 文献レビュー 最近の下水道研究の動向 : 米国WEFの文献レビューから

    山村 寛, 熊越 瑛

    下水道協会誌 = Journal of Japan Sewage Works Association   57 ( 694 )   36 - 54   2020.8

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  • 機械学習による浄水プロセスにおける凝集後濁度予測手法

    鈴木, 昭弘, 川上, 敬, 山村, 寛, Eryanti, Utami Putri, 根本, 雄一, 大江, 亮介

    第82回全国大会講演論文集   2020 ( 1 )   37 - 38   2020.2

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    本研究の目的は浄水場の凝集プロセスにおける凝集剤の注入量を最適化するために、凝集剤を注入した処理水の初期の画像から最終的な凝集後濁度を予測することである。凝集プロセスでは凝集剤を注入し攪拌することによって時間を追うごとにフロックと呼ばれる多量の集塊が形成される。このフロックの形成初期段階の処理水の画像から機械学習を用いて凝集後濁度を予測する。深層畳み込みネットワークを利用し、河川水を用いた実験を行った結果、(1)特徴が出やすいと思われる凝集の時間帯を明らかにし、(2)河川水の凝集中の画像からおよそ90%前後の精度で予測可能であることを明らかにした。

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  • In situ SPF-EEMによる膜の薬品洗浄効果の可視化−薬品洗浄のタイミングがファウリング解消効果に及ぼす影響−

    落合 洸介, 丁 青, 山村 寛, 渡辺 義公, 貝谷 吉英

    全国会議(水道研究発表会)講演集   2020   274 - 275   2020

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  • ジルコニウムメソ構造体包含膜の開発と消化汚泥中のリン回収性能の評価

    黒岩 美帆, 古屋 謙治, 丁 青, 山村 寛, 渡辺 義公

    下水道研究発表会講演集   57   37 - 39   2020

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  • 膜処理技術の最新動向

    山村 寛

    環境浄化技術   11・12   1 - 11   2020

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  • ニューラルネットワークと長短期記憶ネットワークモデルを用いた2-MIBとジェオスミンの将来濃度予測モデルの構築

    石井 崇晃, 山村 寛, 根本 雄一, 佐野 冬実

    全国会議(水道研究発表会)講演集   2020   592 - 593   2020

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  • 水処理のギモン MBRは進化しているか?進化し続けるMBRと今後の課題

    山村寛

    月刊下水道   42 ( 8 )   37‐41   2019.6

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  • Application of Graphene Oxide for Adsorption Removal of Geosmin and 2-Methylisoborneol in the Presence of Natural Organic Matter Reviewed

    Hafuka Akira, Nagasato Takahiro, Yamamura Hiroshi

    INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH   16 ( 11 )   2019.6

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    We investigated the adsorption characteristics of geosmin and 2-methylisoborneol (MIB) on graphene oxide (GO) in the absence and presence of natural organic matter (NOM). The graphene oxide had fast adsorption kinetics for both compounds because of its open-layered structure, with adsorption equilibrium being achieved within 15 min of contact. Although NOM did not affect the adsorption of geosmin on GO, it delayed that of MIB, probably because of competition for adsorption sites. The adsorption isotherms show that GO had a greater capacity for geosmin adsorption than for MIB because geosmin was more hydrophobic. Moreover, NOM interfered with the adsorption of MIB onto the GO, but increased the amount of adsorbed geosmin, which likely occurred because NOM increased the dispersibility of GO, which then increased the number of GO adsorption sites. The difference in the effects of NOM on GO adsorption of geosmin and MIB may be explained by their hydrophobicity. Although the adsorption of geosmin and MIB by GO was fast, its capacity to adsorb both compounds was substantially lower than that of activated carbon because of its higher hydrophilicity.

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  • Application of graphene oxide for adsorption removal of geosmin and 2-methylisoborneol in the presence of natural organic matter

    Akira Hafuka, Takahiro Nagasato, Hiroshi Yamamura

    International Journal of Environmental Research and Public Health   16 ( 11 )   2019.6

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    © 2019 by the authors. Licensee MDPI, Basel, Switzerland. We investigated the adsorption characteristics of geosmin and 2-methylisoborneol (MIB) on graphene oxide (GO) in the absence and presence of natural organic matter (NOM). The graphene oxide had fast adsorption kinetics for both compounds because of its open-layered structure, with adsorption equilibrium being achieved within 15 min of contact. Although NOM did not affect the adsorption of geosmin on GO, it delayed that of MIB, probably because of competition for adsorption sites. The adsorption isotherms show that GO had a greater capacity for geosmin adsorption than for MIB because geosmin was more hydrophobic. Moreover, NOM interfered with the adsorption of MIB onto the GO, but increased the amount of adsorbed geosmin, which likely occurred because NOM increased the dispersibility of GO, which then increased the number of GO adsorption sites. The difference in the effects of NOM on GO adsorption of geosmin and MIB may be explained by their hydrophobicity. Although the adsorption of geosmin and MIB by GO was fast, its capacity to adsorb both compounds was substantially lower than that of activated carbon because of its higher hydrophilicity.

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  • Digestion performance and contributions of organic and inorganic fouling in an anaerobic membrane bioreactor treating waste activated sludge Reviewed

    Hafuka, Akira, Mashiko, Riho, Odashima, Ryuto, Yamamura, Hiroshi, Satoh, Hisashi, Watanabe, Yoshimasa

    BIORESOURCE TECHNOLOGY   272   63 - 69   2019.1

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    This study evaluates the performance of an anaerobic membrane bioreactor (AnMBR) digesting waste activated sludge. A digestion reactor equipped with an external hollow fiber microfiltration membrane module was operated in continuous-mode for 248 days. The system demonstrated 56% volatile solids degradation at an organic loading rate of 0.40 g-VS/(L.d) in 15 days of hydraulic retention time. The average methane content in the biogas produced was 76% which is considerably high compared to that from a typical continuously stirred tank reactor. The transmembrane pressure remained under 12 kPa without membrane cleaning during the experimental period due to low filtration flux (0.01-0.07 m/d) and cross-flow-mode filtration. Ex situ membrane cleaning revealed that physically irreversible fouling was the dominant form of membrane fouling. Inorganic and organic fouling accounted for 16% and 45% of total membrane fouling, respectively.

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  • Size-Exclusion Chromatography: A New Type of Detector for Organic Matter Analysis

    山村寛

    Hitachi Scientific Instrument News (Web)   62 ( 2 )   2019

  • 新下水道ビジョン加速戦略

    山村寛, 山村寛, 久保田慶太, 林梓

    下水道協会誌   55 ( 674 )   37‐45   2018.12

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  • 地震対策

    飛野智宏, 矢本貴俊, 浅木麻衣子, 笹原伸英, 星川珠莉, 高橋良輔, 小泉僚平, 久保田慶太, 山村寛

    下水道協会誌   55 ( 666 )   28‐35   2018.4

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  • Differences in behaviour of three biopolymer constituents in coagulation with polyaluminium chloride: Implications for the optimisation of a coagulation–membrane filtration process Reviewed

    Qing Ding, Hiroshi Yamamura, Hitoshi Yonekawa, Nobuhiro Aoki, Naoki Murata, Akira Hafuka, Yoshimasa Watanabe

    Water Research   133   255 - 263   2018.4

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    DOI: 10.1016/j.watres.2018.01.034

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  • 世界の衛生問題に立ち向かうパイオニア―環境工学が担うSDGsの目標達成に向けて―カンボジア国プノンペン都の都市開発事情―スピード&サステナブル開発競争への誘い―

    山村寛

    土木学会誌   102 ( 11 )   10‐11   2017.11

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  • Development of novel polysulfone membranes with embedded zirconium sulfate-surfactant micelle mesostructure for phosphate recovery from water through membrane filtration Reviewed

    Kenji Furuya, Akira Hafuka, Miho Kuroiwa, Hisashi Satoh, Yoshimasa Watanabe, Hiroshi Yamamura

    WATER RESEARCH   124   521 - 526   2017.11

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    We prepared novel membranes that could adsorb phosphate from water through membrane filtration for use in a phosphate recovery system. Zirconium sulfate surfactant micelle mesostructure (ZS), which was the phosphate adsorbent, was embedded hi a polysulfone matrix and flat sheet ultrafiltration membranes were made by nonsolvent induced phase separation. Scanning electron microscopy showed that the ZS particles existed on both the top surface and in the internal surface of the membrane. Increases in ZS content led to greater pure water flux because of increases in the surface porosity ratio. The amount of phosphate adsorbed on the membrane made from the polymer solution containing 10.5 wt% ZS was 0.071 mg P/cm(2) (64.8 mg P/g-ZS) during filtration of 50 mg P/L synthetic phosphate solution. The membrane could be repeatedly used for phosphate recovery after regeneration by filtration of 0.1 M NaOH solution to desorb the phosphate. We applied the membrane to treat the effluent from an anaerobic membrane bioreactor as a real sample and successfully recovered phosphate. (C) 2017 Elsevier Ltd. All rights reserved.

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  • 膜を使った微細藻類の回収方法の開発

    山村寛

    ケミカルエンジニヤリング   62 ( 10 )   743‐750 - 750   2017.10

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  • 浸水対策

    薄井宗光, 伊東裕, 浅野卓哉, 山村寛, 飛野智宏, 金子陽輔, 浅木麻衣子, 久保田慶太, 星川珠莉

    下水道協会誌   54 ( 654 )   43‐51 - 51   2017.4

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  • Prediction of Asymmetric Yield Strengths of Polymeric Materials at Tension and Compression Using Spherical Indentation Reviewed

    Noriyuki Inoue, Akio Yonezu, Yousuke Watanabe, Hiroshi Yamamura, Baoxing Xu

    JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME   139 ( 2 )   2017.4

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    Engineering polymers generally exhibit asymmetric yield strength in tension and compression due to different arrangements of molecular structures in response to external loadings. For the polymeric materials whose plastic behavior follows the Drucker-Prager yield criterion, the present study proposes a new method to predict both tensile and compressive yield strength utilizing instrumented spherical indentation. Our method is decomposed into two parts based on the depth of indentation, shallow indentation, and deep indentation. The shallow indentation is targeted to study elastic deformation of materials, and is used to estimate Young's modulus and yield strength in compression; the deep indentation is used to achieve full plastic deformation of materials and extract the parameters in Drucker-Prager yield criterion associated with both tensile and compressive yield strength. Extensive numerical computations via finite element method (FEM) are performed to build a dimensionless function that can be employed to describe the quantitative relationship between indentation force-depth curves and material parameters of relevance to yield criterion. A reverse algorithm is developed to determine the material properties and its robustness is verified by performing both numerical and experimental analysis.

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  • 地域資源を活用した再生可能エネルギー等の利活用技術の開発―微細藻類を利用した石油代替燃料等の製造技術の開発―第3章 微細藻類の低コスト回収法の開発 2 Pseudococcomyxa属回収に最適の分離膜の開発

    山村寛, 松本岳

    農林水産省農林水産技術会議事務局研究成果   ( 575 )   128‐134   2017.3

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  • 下水道資源有効活用技術の最新動向 下水処理水を利用して培養した微細藻類による漁業飼料生産技術の開発

    山村寛

    環境浄化技術   16 ( 2 )   27‐34   2017.3

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  • 汚泥処理最前線

    飛野智宏, 金子陽輔, 浅木麻衣子, 山村寛, 西河邦浩, 小泉僚平, 星川珠莉, 田中翔真, 久保田慶太

    下水道協会誌   53 ( 650 )   38‐45 - 45   2016.12

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  • Performance of anaerobic membrane bioreactor during digestion and thickening of aerobic membrane bioreactor excess sludge Reviewed

    Akira Hafuka, Kazuhisa Mimura, Qing Ding, Hiroshi Yamamura, Hisashi Satoh, Yoshimasa Watanabe

    BIORESOURCE TECHNOLOGY   218   476 - 479   2016.10

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    In this study, we evaluated the performance of an anaerobic membrane bioreactor in terms of digestion and thickening of excess sludge from an aerobic membrane bioreactor. A digestion reactor equipped with an external polytetrafluoroethylene tubular microfiltration membrane module was operated in semi-batch mode. Solids were concentrated by repeated membrane filtration and sludge feeding, and their concentration reached 25,400 mg/L after 92 d. A high chemical oxygen demand (COD) removal efficiency, i.e., 98%, was achieved during operation. A hydraulic retention time of 34 d and a pulse organic loading rate of 2200 mg-COD/(L-reactor) gave a biogas production rate and biogas yield of 1.33 L/(reactor d) and 0.08 L/g-CODinput, respectively. The external membrane unit worked well without membrane cleaning for 90 d. The transmembrane pressure reached 25 kPa and the filtration flux decreased by 80% because of membrane fouling after operation for 90 d. (C) 2016 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.biortech.2016.06.124

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  • 最近の下水道研究の動向―米国WEFの文献レビューから―

    山村寛, 久保田慶太, 山下喬子, 薄井宗光, 古屋泰徳, 小泉僚平, 伊東裕, 浅野卓哉, 田中翔真

    下水道協会誌   53 ( 646 )   33‐51 - 51   2016.8

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  • Harvesting Technology for Microalgae in Biodiesel Production Process with Membranes

    山村寛

    膜   41 ( 4 )   142‐149   2016.7

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  • Deformation modeling of polyvinylidenedifluoride (PVDF) symmetrical microfiltration hollow-fiber (HF) membrane

    Shouichi Iio, Akio Yonezu, Hiroshi Yamamura, Xi Chen

    JOURNAL OF MEMBRANE SCIENCE   497   421 - 429   2016.1

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    The tensile deformation behavior of polyvinylidenedifluoride (PVDF) symmetrical microfiltration hollow-fiber (HF) membranes was studied. The membranes had submicron pores with a three-dimensional open-cell structure. The surface and cross section of the porous membranes were observed by FESEM (field emission scanning electron microscope) to investigate the microstructure of the cell, namely, its size and ligament geometry. During uniaxial tensile tests, the membranes underwent elastic deformation and plastic deformation. Large deformation induced pore growth along the tensile direction, resulting in an increase in water permeability. In order to establish a mechanical model for tensile deformation, the finite element method (FEM) was employed. In this model, the Kelvin polyhedron (truncated octahedron structure) was used to mimic a three-dimensional open-cell structure. A one-unit cell based on this structure was created, and a periodical boundary condition was employed for the FEM computation. The FEM model could reproduce the overall elastoplastic deformation behavior of the porous membrane and provide useful insight into the fabrication of porous membranes and reliable operation of water purification. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.memsci.2015.09.048

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  • Tracking inorganic foulants irreversibly accumulated on low-pressure membranes for treating surface water Reviewed

    Hiroshi Yamamura, Katsuki Kimura, Kumiko Higuchi, Yoshimasa Watanabe, Qing Ding, Akira Hafuka

    WATER RESEARCH   87   218 - 224   2015.12

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    While low-pressure membrane filtration processes (i.e., microfiltration and ultrafiltration) can offer precise filtration than sand filtration, they pose the problem of reduced efficiency due to membrane fouling. Although many studies have examined membrane fouling by organic substances, there is still not enough data available concerning membrane fouling by inorganic substances. The present research investigated changes in the amounts of inorganic components deposited on the surface of membrane filters over time using membrane specimens sampled thirteen times at arbitrary time intervals during pilot testing in order to determine the mechanism by which irreversible fouling by inorganic substances progresses. The experiments showed that the inorganic components that primarily contribute to irreversible fouling vary as filtration continues. It was discovered that, in the initial stage of operation, the main membrane-fouling substance was iron, whereas the primary membrane-fouling substances when operation finished were manganese, calcium, and silica. The amount of iron accumulated on the membrane increased up to the thirtieth day of operation, after which it reached a steady state. After the accumulation of iron became static, subsequent accumulation of manganese was observed. The fact that the removal rates of these inorganic components also increased gradually shows that the size of the exclusion pores of the membrane filter narrows as operation continues. Studying particle size distributions of inorganic components contained in source water revealed that while many iron particles are approximately the same size as membrane pores, the fraction of manganese particles slightly smaller than the pores in diameter was large. From these results, it is surmised that iron particles approximately the same size as the pores block them soon after the start of operation, and as the membrane pores narrow with the development of fouling, they become further blocked by manganese particles approximately the same size as the narrowed pores. Calcium and silica are assumed to accumulate on the membrane due to their cross-linking action and/or complex formation with organic substances such as humic compounds. The present research is the first to clearly show that the inorganic components that contribute to membrane fouling differ according to the stage of membrane fouling progression; the information obtained by this research should enable chemical cleaning or operational control in accordance with the stage of membrane fouling progression. (C) 2015 Elsevier Ltd. All rights reserved.

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  • Interactions of dissolved humic substances with oppositely charged fluorescent dyes for tracer techniques Reviewed

    Akira Hafuka, Qing Ding, Hiroshi Yamamura, Koji Yamada, Hisashi Satoh

    WATER RESEARCH   85   193 - 198   2015.11

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    To investigate interactions between oppositely charged fluorescent dyes and dissolved humic substances, fluorescence quenching of fluorescein and rhodamine 6G with dissolved humic substances was performed. Binding coefficients were obtained by the Stern-Volmer equation. The fluorescence of rhodamine 6G was largely quenched by the addition of humic acid and a non-linear Stern-Volmer plot was obtained. This strong quenching may be caused by the electrostatic interaction between cationic rhodamine 6G and humic acid and strengthened by the hydrophobic repulsion. In contrast, the quenching and interactive effects of dissolved humic substances for fluorescein were relatively weak. (C) 2015 Elsevier Ltd. All rights reserved.

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  • 水処理技術における微小世界 浄水膜におけるファウリングの可視化~技術動向とファウリング制御に向けた応用展開~

    山村寛

    水環境学会誌   38(A) ( 10 )   369 - 374   2015.10

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  • 河川水における溶存態有機物の粒径画分の特性解析と生体・生態影響評価

    岡本誠一郎, 對馬育夫, 真野浩行, 山村寛

    下水道関係調査研究年次報告書集   2014   146‐152   2015.10

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  • Hydrophilic Fraction of Natural Organic Matter Causing Irreversible Fouling of Microfiltration and Ultrafiltration Membranes

    山村寛

    水環境学会誌   38(A) ( 8 )   303   2015.8

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  • Effect of intensive membrane aeration and membrane flux on membrane fouling in submerged membrane bioreactors: Reducing specific air demand per permeate (SAD(p))

    Taro Miyoshi, Hiroshi Yamamura, Toru Morita, Yoshimasa Watanabe

    SEPARATION AND PURIFICATION TECHNOLOGY   148   1 - 9   2015.6

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    The effects of membrane module configuration and membrane flux on specific air demand per permeate (SAD(p)) required for stable operation of a submerged membrane bioreactor (MBR) for treating municipal wastewater were investigated. An intensively aerated membrane module was developed to reduce the membrane fouling in submerged membrane bioreactors. In this module, coarse bubbles can be introduced at higher density in the vicinity of the membrane fibers, made of polytetrafluoroethylene (PTFE), which has a very high tensile strength (90-110 N/fiber) even though it has high porosity (about 80%). By applying the intensively aerated membrane module developed in this study to pilot-scale MBRs, very low membrane fouling rate was achieved during the continuous MBR operation. The observation of fiber movements using high speed camera revealed that the membrane-fiber vibration in the intensively aerated module were apparently intensified compared with those in a conventional membrane module. Reducing membrane flux was also beneficial for reducing SAD(p). When the MBR equipped with the intensively aerated module, stable continuous MBR operation without any membrane cleaning for two months under low SAD(p) (8.8 m(3)-air/m(3)-permeate) was achieved by lowering membrane flux to 16 L/m(2) h (or 0.4 m(3)/m(2)/day), even in the short membrane height of 0.5 m. These results strongly suggest that there is still great room for improving the efficiency of membrane aeration by optimizing hydrodynamics around membrane modules. (C) 2015 Elsevier B.V. All rights reserved.

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  • 合流式下水道の改善対策

    山村寛, 碓井次郎, 山下喬子

    下水道協会誌   52 ( 630 )   29 - 36   2015.4

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  • PACl凝集条件がメソ粒子のゼータ電位及び粒子数に与える影響

    山村寛, DING Qing, 村田直樹, 青木伸浩, 米川均, 渡辺義公

    土木学会論文集 G(環境)(Web)   71 ( 7 )   III_447‐III_454(J‐STAGE)   2015

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  • 水道水膜処理技術の動向と問題点―ファウリング―

    山村寛

    MRC News   ( 52 )   79 - 103   2014.11

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  • 前凝集‐膜ろ過プロセスにおけるナノフロックが不可逆的膜ファウリングの進行に及ぼす影響

    DING Qing, 山村寛, 村田直樹, 青木伸浩, 米川均, 渡辺義公

    EICA   19 ( 2/3 )   158 - 161   2014.10

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  • Seasonal variation of effective chemical solution for cleaning of ultrafiltration membrane treating a surface water

    Hiroshi Yamamura, Katsuki Kimura, Yoshimasa Watanabe

    SEPARATION AND PURIFICATION TECHNOLOGY   132   110 - 114   2014.8

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    Water treatment using ultrafiltration (UF) membranes is gaining popularity world-wide, but the problem of membrane fouling needs to be addressed. We investigated the characteristics of membrane foulants by conducting two long-term filtration experiments using surface water from the Chitose River. The membrane was made of polyacrylonitrile and had a molecular weight cut-off of 100 kDa. The experiments were conducted in February 2004 Winter operation (Run 1) and October 2005 Summer operation (Run 2), when feed water characteristics were considerably different. Despite this, rates of physically irreversible fouling were similar. By measuring pure water permeability before and after chemical cleaning, we found that acidic or chelate solutions were most effective for cleaning the membrane from Run 1, whereas an alkaline solution was more effective for that from Run 2. Analysis of the chemical solutions that effective worked for canceling the fouling revealed that acidic cleaning in Run 1 extracted iron, carbohydrate and humic acid, while alkaline cleaning in Run 2 extracted carbohydrates. These results indicates that the iron, carbohydrates and humic acid caused the physically irreversible fouling in Run I, and carbohydrates were mainly responsible in Run 2. Based on the findings obtained in this study, it was suggested that the most important foulants and the most effective chemical cleaning agents may differ substantially between seasons. (C) 2014 Elsevier B.V. All rights reserved.

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  • Influence of extracellular polysaccharides (EPS) produced by two different green unicellular algae on membrane filtration in an algae-based biofuel production process Reviewed

    Takaki Matsumoto, Hiroshi Yamamura, Jyunpei Hayakawa, Yoshimasa Watanabe, Shigeaki Harayama

    WATER SCIENCE AND TECHNOLOGY   69 ( 9 )   1919 - 1925   2014

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    In the present study, two strains of green algae named S1 and S2, categorized as the same species of Pseudo-coccomyxa ellipsoidea but showing 99% homology, were cultivated under the same conditions and filtrated with a microfiltration membrane. On the basis of the results of the extracellular polysaccharides (EPS) characteristics of these two green algae and the degree of fouling, the influence of these characteristics on the performance of membrane filtration was investigated. There was no difference in the specific growth rate between the S1 and S2 strains; however, large differences were seen in the amount and quality of EPS between S1 and S2. When the S1 and S2 strains were filtered with a membrane, the trend in the increase in transmembrane pressure (TMP) was quite different. The filtration of the S1 strain showed a rapid increase in TMP, whereas the TMP of the filtration of the S2 strain did not increase at all during the operation. This clearly demonstrated that the characteristics of each strain affect the development of membrane fouling. On the basis of the detailed characterization of solved-EPS (s-EPS) and bound-EPS (b-EPS), it was clarified that s-EPS mainly contributed to irreversible fouling for both operations and the biopolymer-like organic matter contained in b-EPS mainly contributed to reversible fouling.

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  • Tensile deformation of polytetrafluoroethylene hollow fiber membranes used for water purification Reviewed

    Akio Yonezu, Shouichi Iio, Takehiro Itonaga, Hiroshi Yamamura, Xi Chen

    WATER SCIENCE AND TECHNOLOGY   70 ( 7 )   1244 - 1250   2014

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    The tensile deformation behavior of polytetrafluoroethylene (PTFE) hollow fiber membranes is studied. PTFE membranes at present have sub-micron pores with an open cell structure, which plays a critical role in water purification. One of the main challenges in water purification is that the pore structure becomes covered with biofouling, leading to blocked pores. To maintain the capacity for water purification, physical cleaning along with mechanical deformation is usually conducted. Thus, it is crucial to understand the mechanical properties, in particular the deformation behavior, of the membrane fibers. Using uniaxial tension experiments, we established a fundamental discrete model to describe the deformation behavior of a porous structure using a finite element method. The present model enables the prediction of the macroscopic deformation behavior of the membrane, by taking into account the changes of pore structure. The insight may be useful for porous membrane fabrication and provide insights for the reliable operation of water purification.

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  • Current Research in Drinking Water Treatment with Membrane Technology

    36 ( 12 )   430 - 438   2013.12

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  • 膜を利用した浄水処理技術に関する最新研究動向

    山村寛, 木村克輝

    日本水環境学会誌   ( 36 )   1 - 9   2012.12

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  • 総説:分離膜の基礎と応用--水処理への展開を例に

    触媒学会誌特集:ものをわける   2011.3

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  • Membrane Filtration: Principle and Applications in Water Treatment Reviewed

    Hiroshi Yamamura, Masatoshi Hashino, Noboru Kubota

    SEN-I GAKKAISHI   67 ( 3 )   P81 - P86   2011.3

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  • Membrane filtration: Principle and applications in water treatment

    Hiroshi Yamamura, Masatoshi Hashino, Noboru Kubota

    Journal of Fiber Science and Technology   67   2011.1

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  • Membrane technology for Asahi Kasei Microza and application of PVDF membrane for water treatment Reviewed

    Hiroshi Yamamura

    IWA regional conference and exhibition on membrane technology and water reuse   2010.10

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  • 総説:水処理膜の今後の展望

    触媒学会年鑑   2010.3

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  • Fouling characteristics of pressurized and submerged PVDF (polyvinylidene fluoride) microfiltration membranes in a pilot-scale drinking water treatment system under low and high turbidity conditions

    So-Ryong Chae, Hiroshi Yamamura, Bowha Choi, Yoshimasa Watanabe

    DESALINATION   244 ( 1-3 )   215 - 226   2009.8

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    Performance and fouling characteristics of two pilot-scale polyvinylidene fluoride hollow fiber microfiltration membranes for drinking water treatment were studied under the same flux and physical cleaning conditions. It is expected that this paper can provide insights into the functions of operation mode (one pressurized and one submerged) of the membrane in process performance and fouling evolution. As a result, it was found that the two membranes showed similar performance in terms of removal efficiencies of organic and inorganic substances. However, the pressurized membrane showed relatively more severe membrane fouling than the submerged membrane because the cake compressibility and thickness seemed to have been increased due to the hard-to-remove cake layer of the pressurized membrane containing relatively large amounts of humic substances, carbohydrate, and Fe than that of the submerged membrane, especially under high turbidity conditions without any pre-treatment. Under low turbidity conditions with pre-coagulation/sedimentation, the two membranes showed similar behaviors for increase of transmembrane pressure. After the chemical cleaning that was carried out after removing the cake layers from the membrane, surface flux restoration of the two membranes was not much different.

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  • Measurements of interaction forces between protein-coated collids and membrane surfaces by atomic force microscopy Reviewed

    Hiromasa Matsuno, Hiroshi Yamamura

    The 5th conference of Aseanian Membrane Society   2009.7

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  • Directed aggregation and fusion of lipid vesicles induced by DNA-surfactants Reviewed

    Tatsuo Maruyama, Hiroshi Yamamura, Mai Hiraki, Yoshinori Kemori, Harumi Takata, Masahiro Goto

    COLLOIDS AND SURFACES B-BIOINTERFACES   66 ( 1 )   119 - 124   2008.10

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    We investigated DNA-directed aggregation of vesicles using DNA-surfactants. Following tethering of single-stranded DNA oligonucleotides to vesicles using DNA-surfactant, the tethered vesicles were assembled with other vesicles bearing complementary strands. The vesicle aggregation was strongly affected by the salt concentration and by temperature according to the characteristics of DNA hybridization. Restriction enzyme, which can hydrolyze the double-stranded DNA used in the present study, dissociated the vesicle aggregates. Exploration using fluorescently labeled vesicles suggested char the DNA-directed vesicle aggregation took place in a sequence-specific manner through DNA-duplex formation. Interestingly, the DNA-directed aggregation using short DNA-surfactant induced the fusion of vesicles to produce giant vesicles, resulting in an enzymatic reaction in the giant vesicle. (c) 2008 Elsevier B.V. All rights reserved.

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  • Influence of calcium on membrane fouling in MF membrane caused by hydrophilic fraction of NOM Reviewed

    Hiroshi Yamamura, Kenji Okimoto

    IWA World water congress and exhibition   2008.9

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  • Identification of constituent and mechanism related to physically irreversible fouling in MF membrane Reviewed

    Hiroshi Yamamura, Katsuki Kimura, Yoshimasa, Watanabe

    Academic summer school particle separation in water and wastewater treatment   2008.7

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  • Irreversible membrane fouling in microfiltration membranes filtering coagulated surface water

    Katsuki Kimura, Tomohiro Maeda, Hiroshi Yamamura, Yoshimasa Watanabe

    JOURNAL OF MEMBRANE SCIENCE   320 ( 1-2 )   356 - 362   2008.7

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    Chemical coagulation has been widely used as a method to mitigate membrane fouling in MF/UF membranes used for drinking water treatment. Optimization of coagulation as pre-treatment of membrane processes has not been achieved yet: the optimum condition of coagulation for conventional treatment systems is not necessarily applicable to membrane-based treatment systems. This study investigated (physically) irreversible membrane fouling in an MF membrane used with pre-coagulation by aluminum salt. In a series of bench-scale filtration tests, feed water containing commercially available humic acid or organic matter isolated from surface water was coagulated with polyaluminum chloride (PACl) under various conditions and subsequently filtered with an MF membrane with the nominal pore size of 0.1 mu m. It was found that coagulation conditions had great impacts on the degree of physically irreversible fouling. Acidic conditions improved the quality of treated water but generally caused greater physically irreversible fouling than did neutral or alkaline conditions. Also, dosage of coagulant was found to be influential on the degree of membrane fouling: high dosage of coagulant frequently caused more severe irreversible fouling. Sizes of flocs seemed to become small under acidic conditions in this study, which was indicated by high concentrations of aluminum in the permeate under acidic conditions. It is thought that small flocs produced under acidic conditions could migrate into micropores of the membrane and caused physically irreversible fouling by plugging or adsorption. These findings obtained in the bench-scale tests were verified in a long-term pilot-scale test. (C) 2008 Elsevier B.V. All rights reserved.

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  • Comparison of fouling characteristics of two different poly-vinylidene fluoride microfiltration membranes in a pilot-scale drinking water treatment system using pre-coagulation/sedimentation, sand filtration, and chlorination Reviewed

    So-Ryonq Chae, Hiroshi Yamamura, Keiichi Ikeda, Yoshimasa Watanabe

    WATER RESEARCH   42 ( 8-9 )   2029 - 2042   2008.4

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    Two pilot-scale hybrid water treatment systems using two different poly-vinylidene fluoride (PVDF) microfiltration (MF) membranes (i.e. symmetric and composite) were operated at a constant permeate flux of 104.2l m(-2) h(-1) (= 2.5 md(-1)) with a pre-coagulation/sedimentation, sand filtration (SF), and chlorination to produce potable water from surface water. Turbidity was removed completely. And humic substances, Al, and Fe were removed very well by the pilot-scale membrane system. To control microbial growth and mitigate membrane fouling, a NaOCl solution was injected into the effluent from SF before reaching the two membranes (pre-chlorination). However, it adversly affected membrane fouling due to the oxidization and adsorption of inorganic substances such as Al, Fe, and Mn. In the next run, the NaOCl was introduced during backwash (post-chlorination). As compared with the result of pre-chlorination, this change increased the operating period of the symmetric and the composite membranes from about 10 and 50 days to about 60 and 200 days, respectively. (C) 2007 Elsevier Ltd. All rights reserved.

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  • Control of physically irreversible fouling in microfiltration by pre-coagulation

    山村寛, 前田智宏, 木村克輝, 渡辺義公

    環境工学研究論文集   44   135 - 141   2007.11

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    A long-term filtration experiment with a microfiltration membrane was carried out at an existing water purification plant and the influence of pre-coagulation on the evolution of physically irreversible fouling was investigated. Coagulation carried out at pH 7 mitigated the evolution of physically irreversible fouling. It was found that the degree of physically reversible fouling increased as a result of coagulation. Chemical analysis of the foulant desorbed by NaOH or HCl solution showed that pre-coagulation could prevent the fouling caused by iron, but could not control the fouling caused by organic matters. Particle size distribution of iron in the feed water implied that physically irreversible fouling was caused by the iron of size close to the micro-pores of the membrane (around 0.1μm) when coagulationwas not carried out. The pre-coagulation enlarged the size of iron particles, and would prevent the evolution of physically irreversible fouling. Based on the results obtained in this study, for the control of physically irreversible fouling, the optimum condition of coagulation is determined as follows: the one that can enlarge particles in the feed water with the size that is close to opening of membrane micro-pores.

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  • Influence of calcium on the evolution of irreversible fouling in microfiltration/ultrafiltration membranes

    Hiroshi Yamamura, Kenji Okimoto, Katsuki Kimura, Yoshimasa Watanabe

    JOURNAL OF WATER SUPPLY RESEARCH AND TECHNOLOGY-AQUA   56 ( 6-7 )   425 - 434   2007.9

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    Water treatment using microfiltration (MF)/ultrafiltration (UF) membranes is gaining in popularity all over in this study the influence of problem of membrane fouling needs to be addressed the world but the, calcium on irreversible fouling in MF/UF membrane filtering natural organic matter (NOM) was investigated on the basis of a series of bench-scale filtration tests. Two types of feed water, solution of commercially available humic acid and surface water used for drinking water source, were filtered with four different MF/UF membranes. It was found that the influence of calcium on the evolution of irreversible fouling would differ depending on the feed water characteristics. Calcium facilitated the aggregation of small molecules with hydrophobic nature contained in commercially available humic acid and the aggregate probably plugged the micropores, resulting in severe irreversible fouling. The effect of calcium was not obvious in the case of the surface water used in this study. This result implies that the use of commercial humic acid for the examination of membrane fouling would be inappropriate.

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  • Difference in foulant characteristics in an ultrafiltration membrane caused by seasonal variation of feed water Reviewed

    Hiroshi Yamamura, Katsuki Kimura, Yoshimasa Watanabe

    The 4th IWA International Membrane Conference   2007.5

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  • Effect of pre-treatment on membrane fouling of PVDF (Polyvinylidene Fluoride) microfiltration membrane with different structures in a pilot-scale drinking water production system Reviewed

    So-Ryong Chae, Hiroshi Yamamura, K. Ikeda

    J. Water and Environ. Technol.   5 ( 2 )   79 - 85   2007

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    Two pilot-scale polyvinylidene fluoride (PVDF) microfiltration (MF) membranes with different structures (i.e. symmetric and asymmetric) were operated after coagulation/sedimentation, sand filtration, and chlorination. Turbidity was removed completely. Moreover, humic substances, Al, and Fe were removed very well by the pilot-scale system. An asymmetric membrane (HFS membrane) having a nominal pore size of 0.05 &mu;m showed relatively high removal efficiency of the small organic matter (about 6,000 Da) than a symmetric membrane (HFM membrane) having a nominal pore size of 0.1 &mu;m. However, the extracted inorganic concentrations of the HFM membrane were relatively higher than that of the HFS membrane. Therefore, it could be concluded that the HFS membrane better reduced membrane fouling than the HFM although the nominal pore size of the former was half of the latter. To control microbial growth and mitigate membrane fouling, a NaOCl solution was injected into the effluent of sand filtration before the both membranes. However, it adversly affected membrane fouling due to the oxidization of inorganic substances such as Al, Fe, and Mn.

    DOI: 10.2965/jwet.2007.79

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  • Method for selective isolation of mycobacteria using olive oil emulsified with SDS Reviewed

    Hideki Yamamura, Shigeaki Harayama

    Bioscience, Biotechnology and Biochemistry   71 ( 6 )   1553 - 1556   2007

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    This paper describes the demulsification of olive-oil/ SDS emulsion (DOSE) method for selective isolation of environmental mycobacteria. A soil sample was suspended in olive oil and centrifuged. The supernatant was emulsified on plates together with SDS solution. After incubation, the colonies that had developed on the plates were surrounded by clear zones. The isolates were identified as genus Mycobacterium, and as belonging to a fast-growing group, by 16S rRNA gene sequence analysis.

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    Other Link: http://orcid.org/0000-0003-2103-7796

  • Irreversible fouling in MF/UF membranes caused by natural organic matters (NOMs) isolated from different origins

    Katsuki Kimura, Hiroshi Yamamura, Yoshimasa Watanabe

    SEPARATION SCIENCE AND TECHNOLOGY   41 ( 7 )   1331 - 1344   2006

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    For more efficient use of membrane technology in water treatment, it is essential to understand more about the fouling that requires chemical cleaning to be eliminated (i.e., irreversible fouling). In this study, five different MF/UF membranes and four types of organic matter collected from different origins were examined in terms of the degree of irreversible membrane fouling. Experimental results demonstrated that the extent of irreversible fouling differed significantly depending on the properties of both the membrane and organic matter. Among the tested membranes, UF membranes made of polyacrylonitrile (PAN) exhibited the best performance in terms of prevention of irreversible fouling. In contrast, MF membranes, especially one made of polyvinylidenefluoride (PVDF), suffered significant irreversible fouling. Conventional methods for characterization of organic matter such as specific ultraviolet absorption (SUVA), XAD fractionation, and excitation-emission matrix (EEM) were found to be inadequate for prediction of the degree of irreversible fouling. This is because these analytical methods represent an average property of bulk organic matter, while the fouling was actually caused by some specific fractions. It was revealed that hydrophilic fraction of the organic matter was responsible for the irreversible fouling regardless of the type of membranes or organic matter.

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  • 河川水UF膜ろ過における不可逆的膜ファウリングの原因物質

    山村 寛, 木村 克輝, 渡辺 義公

    衛生工学シンポジウム論文集   13   227 - 230   2005.11

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  • Membrane fouling in pilot-scale membrane Bioreactors (MBRs) treating municipal wastewater Reviewed

    K Kimura, N Yamato, H Yamamura, Y Watanabe

    ENVIRONMENTAL SCIENCE & TECHNOLOGY   39 ( 16 )   6293 - 6299   2005.8

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    The main obstacle for wider use of membrane bioreactors (MBRs) for wastewater treatment is membrane fouling (i.e., deterioration of membrane permeability), which increases operating costs. For more efficient control of membrane fouling in MBRs, an understanding of the mechanisms of membrane fouling is important. However, there is a lack of information on membrane fouling in MBRs, especially information on features of components that are responsible for the fouling. We conducted a pilot-scale experiment using real municipal wastewater with three identical MBRs under different operating conditions. The results obtained in this study suggested that the food-microorganisms ratio (F/M) and membrane filtration flux were the important operating parameters that significantly influenced membrane fouling in MBRs. Neither concentrations of dissolved organic matter in the reactors nor viscosity of mixed liquor, which have been thought to have influences on fouling in MBRs, showed clear relationships with membrane fouling in this study. Organic substances that had caused the membrane fouling were desorbed from fouled membranes of the MBRs at the termination of the operation and were subjected to Fourier transform infrared (FTIR) and C-13 nuclear magnetic resonance (NMR) analyses. These analyses revealed that the nature of the membrane foulant changes depending on F/M. It was shown that high F/M would make the foulant more proteinaceous. Carbohydrates were dominant in membrane foulants in this study, while features of humic substances were not apparent.

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  • 起源を異にする溶存有機物による不可逆的膜ファウリング

    山村寛, 木村克輝, 渡辺義公

    環境工学研究論文集   41   257 - 267   2004.11

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Books

  • Membrane Filtration for Drinking Water Treatment: The Past, Present, and Future

    山村寛

    2022 

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  • わが国における水処理技術の現状と課題 脱炭素社会における水処理イノベーション

    山村寛

    2022 

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  • ファウリングの原因と対策・抑制技術

    渡辺 義公, 山村 寛, 池嶋 規人, 糸川 博然, 森田 優香子, 島村 和彰, 中村 一穂, 根本 雄一, 薮野 洋平, 中西 弘貴, 中川 彰利, 船津 公人, 金子 弘昌, 伊藤 世人, 熊野 淳夫, 加藤 玲朋, 寺田 昭彦, 赤松 憲樹, 高羽 洋充, 的場 雄介, 澤田 繁樹( Role: Joint author)

    S&T出版株式会社  2016.2  ( ISBN:4907002521

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  • 膜ファウリングの可視化」濾過スケールアップの正しい進め方と成功事例集、第3章、第5節

    ( Role: Joint author)

    2014 

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  • 膜ファウリングの可視化」濾過スケールアップの正しい進め方と成功事例集

    山村 寛( Role: Joint author第3章、第5節)

    2014 

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  • 膜ファウリングの素性と制御技術~原因物質・発生メカニズム・対処方法~|rn|水処理膜の製膜技術と材料評価

    渡辺 義公( Role: Joint author担当:第1章第1節 第5章第1節)

    サイエンス&テクノロジー|rn|(S&T出版)  2012.1 

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MISC

  • CO2 Supply to Large-scale Microalgae Cultivation by a Non-porous Hollow Fiber Membrane using Exhaust Gas derived from Biomass Power Generation

    WU Xiuying, 山村寛, DING Qing, 安保貴永, 中原禎仁, 稲葉遊, 鈴木秀幸

    日本水環境学会年会講演集   57th   2023

  • Comparison of potable and non-potable water quality based on comprehensive analytical data by machine learning

    大谷恭平, 原宏江, 池本良子, 本多了, 花本征也, 山村寛

    日本水環境学会年会講演集   57th   2023

  • Lifecycle management of water-treatment membranes

    山村寛, 井上光希, 前田寛明, 原宏江, 池辺弘明, 大熊那夫紀

    日本水環境学会シンポジウム講演集   25th   2022

  • Combined Approach of Chemometric Tool and Traditional Fractionation Method to Investigate Cytotoxic Substances Originated from Municipal Wastewaters

    原宏江, KAHATAGAHAWATTE Y.B.P., ZHAN Jingya, 山口裕通, 本多了, 松浦哲久, 池本良子, 山村寛

    日本水環境学会年会講演集   55th   2021

Presentations

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Awards

  • 環境工学研究フォーラム 優秀ポスター発表賞

    2022.11   土木学会環境工学委員会   多孔性水酸化ジルコニウム包含多孔質膜による排水からの高純度リン酸回収

    山村寛, 黒岩美帆, 森谷颯太, 河崎颯斗, 角田貴之, 渡辺義公

  • 第53回環境工学研究フォーラム 優秀ポスター発表賞

    2016.12   土木学会   固体三次元励起蛍光スペクトル法による膜ファウリング物質の非破壊-連続観察

    山村寛, 藩鵬, 貝谷 吉英, 渡辺義公

  • 日本水環境学会論文奨励賞(廣瀬賞)

    2015.6   日本水環境学会   Hydrophilic fraction of natural organic matter causing irreversible fouling of microfiltration and ultrafiltration membranes.

    山村 寛

  • The JSWE Paper Award for Young Researchers

    2015.6   JWRC   Hydrophilic fraction of natural organic matter causing irreversible fouling of microfiltration and ultrafiltration membranes

    Hiroshi Yamamura

  • 第2回博士研究奨励賞(オルガノ賞)

    2008.11   日本水環境学会   物理的に不可逆的な膜ファウリングの“原因物質“及び“発生機構“

  • 日本水環境学会若手研究紹介(オルガノ)セッション最優秀発表賞

    2008.11   日本水環境学会   物理的に不可逆的な膜ファウリングの“原因物質“及び“発生機構“

  • 第2回博士研究奨励賞(オルガノ賞)

    2008.9   日本水環境学会   物理的に不可逆的な膜ファウリングの“原因物質“及び“発生機構“

    山村 寛

  • 第61回土木学会年次学術講演会優秀講演者賞

    2006.9   土木学会   原水水質変動に起因するUF膜ファウリング原因物質の変化

    山村 寛

  • 吉町先生記念賞

    2004.3   北海道大学工学部   北海道大学工学部環境工学科総代

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Research Projects

  • Application of solid phase EEM for autonomous controlled membrane filtration system in drinking water treatment

    Grant number:23H01543  2023.4 - 2027.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)  Chuo University

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    Grant amount: \19240000 ( Direct Cost: \14800000 、 Indirect Cost: \4440000 )

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  • 深層学習を用いた浄水処理の凝集プロセス自律制御手法の開発

    Grant number:22K04382  2022.4 - 2025.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)  北海道科学大学

    鈴木 昭弘, 川上 敬, 山村 寛

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    Grant amount: \2080000 ( Direct Cost: \1600000 、 Indirect Cost: \480000 )

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  • Energy and resource recovery from wastewater by two-stage membrane process

    Grant number:22H01622  2022.4 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)  The University of Tokyo

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    Grant amount: \17550000 ( Direct Cost: \13500000 、 Indirect Cost: \4050000 )

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  • Development of new water quality sensing technology for realization of sustainable small-scale water supply systems

    Grant number:21H04568  2021.4 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)  Hokkaido University

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    Grant amount: \39780000 ( Direct Cost: \30600000 、 Indirect Cost: \9180000 )

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  • Development and application of innovative monitoring technologies of microorganisms: Challenge to eradication of waterborne infectious diseases in Asia

    Grant number:20KK0090  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))  Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))  Hokkaido University

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    Grant amount: \18720000 ( Direct Cost: \14400000 、 Indirect Cost: \4320000 )

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  • In-situ quantification of membrane foulants by Solid phase fluoresence excitation emission matrix

    Grant number:20H02288  2020.4 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)  Chuo University

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    Grant amount: \18070000 ( Direct Cost: \13900000 、 Indirect Cost: \4170000 )

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  • Fundamental control of membrane fouling based on detailed information on biopolymers in surface water

    Grant number:18H03789  2018.4 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)  Hokkaido University

    Kimura Katsuki

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    Grant amount: \42510000 ( Direct Cost: \32700000 、 Indirect Cost: \9810000 )

    In previous studies, the importance of biopolymers (hydrophilic organic macro-molecules) in evolution of fouling of membranes filtering surface water was pointed out. In this study, a new method for isolation of biopolymers from surface water was established. It was found that the new method provided significantly high rates of recovery and purity of biopolymers. Physical-chemical properties and fouling potentials of the biopolymers isolated from various drinking water sources were investigated. It turned out that the properties isolated from natural water were considerably different from those of model biopolymers (e.g., alginate) used often in previous researches. Fouling potentials of the isolated biopolymers were assessed by using QCM. Information obtained by this assessment could be used for efficient selection of materials for new anti-fouling membranes.

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  • Isolation and application of bacillus sp. for reduction of membrane foulants

    Grant number:18K18889  2018.6 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Challenging Research (Exploratory)  Challenging Research (Exploratory)  Chuo University

    YAMAMURA HIROSHI

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    Grant amount: \6370000 ( Direct Cost: \4900000 、 Indirect Cost: \1470000 )

    Membrane bioreactor can obtain extremely advanced treated water compared with conventional activated sludge process, while fouling of membranes pores has become a serious problem. In this study, the study was carried out with the aim of searching for bacteria capable of decomposing the membrane fouling substance at low temperature.
    From the sludge acclimated at low temperature, the bacteria using the biopolymer as a substrate was successfully isolated, and it was clarified that the bacteria which became completely at the mesophilic time was active in the low temperature. It was also confirmed that the membrane fouling can be suppressed by the activity of these bacteria at low temperature.

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  • 水中バイオポリマーの詳細な特性解明に基づく膜目詰まり問題の根本的解決

    2018.4 - 2020.3

    JSPS  科研  基盤研究(A) 

    木村 克輝

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    Grant type:Competitive

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  • NOMの固体EEMデータベース構築とIn-situファウリング観察技術の開発

    2017.4 - 2020.3

    文部科学省  科学研究費補助金(日本学術振興会・文部科学省)-若手研究(A) 

    山村 寛

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    Authorship:Principal investigator  Grant type:Competitive

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  • 膜ファウリング物質を資化する好低温グラム陽性菌の単離と応用技術の開発

    2018.4 - 2019.3

    JSPS  科研費  挑戦的研究(萌芽) 

    山村 寛

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount: \6370000 ( Direct Cost: \4900000 、 Indirect Cost: \1470000 )

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  • Micro algae production system using purified municipal wasterwater by membrane bioreactor

    Grant number:16H04440  2016.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)  Chuo University

    Watanabe Yoshimasa

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    Grant amount: \18460000 ( Direct Cost: \14200000 、 Indirect Cost: \4260000 )

    Treated municipal wastrwater by MBR was reused for the cultivation of microalgae. Microalgae can be use as the source of protein for theaquaculture. The results obtained in the research can be summarized as follows:
    1) MBR: Buffled MBR can be operated by controlling the cycle time in bMBR and ORP in the inner part of buffles to maintain the optomum nitrogen oncentration for the microalgae cultivation. Operation nerg of bMBR was reduced to 0.2 kwh/m3 by using the long (3 m) and high density PTFE membrane module, 2)MIcroalgare:P. Ellipoidea was selected which has the optimum growth pH of 3.0. Protein content of about 18% was obtained, which is almost the same as a sardine.

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  • Control of membrane fouling by specific removal of polysaccharides using glycoblotting

    Grant number:15H04063  2015.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)  Hokkaido University

    Kimura Katsuki

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    Grant amount: \17680000 ( Direct Cost: \13600000 、 Indirect Cost: \4080000 )

    Biopolymers, defined as hydrophilic organic macromolecules in natural water, have been identified as major players in membrane fouling. In this study, glycoblotting, which was developed to specifically capture oligosaccharides in the field of medical science, was applied for establishing a new pre-pretreatment for membrane processes in water treatment. Removal of biopolymers was limited under a normal temperature. However, use of catalysts such as aniline or oxidants enabled to remove biopolymers via glycoblotting under a normal temperature. It was suggested that biopolymers detected by the conventional method should be further fractionated to investigate membrane fouling caused by biopolymers. Modified liquid chromatography with organic carbon detection (LC-OCD) analysis enabled the further fractionation of biopolymers.

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  • 国土交通省下水道技術研究開発(GAIAプロジェクト)

    2015.4 - 2017.3

    国土交通省  下水道技術研究開発(GAIAプロジェクト) 

    山村 寛

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount: \15000000

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  • 下水を利用して培養した微細藻類による漁業飼料生産技術の開発

    2015.4 - 2017.3

    国土交通省  下水道技術研究開発(GAIAプロジェクト) 

    山村 寛

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  • 使用済み海水淡水化膜を活用した途上国工業団地での工場排水再利用システムの開発

    2015.4 - 2017.3

    環境省  環境研究総合推進費 循環型社会形成推進研究 循環型社会形成推進研究事業 

    山村 寛

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    Authorship:Principal investigator  Grant type:Competitive

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  • Development of on-site, real-time, multi-analytical technology of heavy metals in the environment based on optical waveguide spectroscopy

    Grant number:26289178  2014.4 - 2017.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)  Hokkaido University

    Satoh Hisashi

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    Grant amount: \16120000 ( Direct Cost: \12400000 、 Indirect Cost: \3720000 )

    Simple analytical methods are needed for determining the cadmium (Cd) content of brown rice samples. In the present study, we developed a new analytical procedure. Digestion with 0.1 M HCl for 10 min at room temperature was sufficient to extract Cd from the ground rice samples. The Cd in the extract was successfully purified in preference to other metals using Dowex 1X8 chloride form resin. Low concentrations of Cd in the eluate could be determined using fluorescence spectroscopy with a fluoroionophore. Overall, the actual limit of quantification value for the Cd content in rice was about 0.1 mg/kg, which was sufficiently low compared with the regulatory value (0.4 mg/kg) given by the Codex Alimentarius Commission. We analyzed authentic brown rice samples using our new analytical procedure and the results agreed well with those determined using inductively coupled plasma optical emission spectrometry (ICP-OES).

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  • 高油脂生産微細藻類の大規模培養と回収および燃料化に関する研究開発

    2013.4 - 2017.3

    独立行政法人新エネルギー・産業技術総合開発機構  戦略的次世代バイオマスエネルギー利用技術開発事業 戦略的次世代バイオマスエネルギー利用技術開発事業 

    山村 寛

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    Grant type:Competitive

    航空機や船舶などエネルギー密度の高い燃料が必要な運輸産業において、液体燃料枯渇への対策は21世紀の人類が解決しなければならない重要な課題の一つである。エネルギー密度の高い燃料は、植物や動物の油脂などを水素化することで実現できると思われるが、食糧危機に直面する人類にとって、充分量の油分源の確保は深刻な問題である。そこで、栽培適地でない場所でも増殖可能な微細藻類を活用することが期待される。我々は、低コスト且つ化石燃料に対するGHG排出量を50%削減できる藻類由来バイオ燃料の商業化を目指し、デンソーの保有する高

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  • 膜を用いた微細藻類の分離回収技術の開発

    2013.4 - 2017.3

    NEDO  戦略的次世代バイオマスエネルギー 利用技術開発事業 

    山村 寛

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    Authorship:Principal investigator  Grant type:Competitive

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  • 使用済みRO膜を用いた管理型埋立地浸出水に含まれるホウ素除去プロセスの開発

    2015.10 - 2016.9

    クリタ水環境科学振興財団  研究助成 

    山村 寛

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    Authorship:Principal investigator  Grant type:Competitive

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  • 近赤外分光法とケモメトリックスを利用した膜ファウリングのIn-situモニタリング手法の開発

    2015.4 - 2016.3

    中央大学 

    山村 寛

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    Authorship:Principal investigator  Grant type:Competitive

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  • Development of Membrane Bioreactor with less nergy consumption and multi^function

    Grant number:25249073  2013.10 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)  Chuo University

    watanabe yoshimasa, KIMURA Katsuki, YAMAMURA Hiroshi, SATOH Hisashi, HAFUKA Akira

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    Grant amount: \40950000 ( Direct Cost: \31500000 、 Indirect Cost: \9450000 )

    A pilot plant study of the buffled MBR with PTFE membranes of 3 m long ,which can achieve simultaneous removal of BOD, T-N and T-P in a single reacto, was carried out. As the results, stabler removal of BOD, T-N and T-P was observed, and the electric power consumption rate of 0.35 kWh/m3 was obtained. It is very low compared with the existing MBR.We developted a nove PTFE hollow fiber MF membrane module with intensive air diffuser. A series of small pilot plant experiment showed a quite low electric power consumption is possible in the MBR with the novel module. P recovery from the MBR exess sludge was possible when the effluent from the MBR was treated through the column filled with zirconia mezo-structured paricles. Anaerobic MBR with a MF hollowfiber membrane incoorated with zirukonium mes- structured particles has a high potential for the phosphate recovery from the excess sludge.

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  • 選択性を付加した新規機能性イオン交換樹脂による膜閉塞抑制の新展開

    2013.10 - 2014.9

    クリタ水・環境科学振興財団  研究助成 

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    Grant type:Competitive

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  • 使用済みRO膜を用いた管理型埋立地浸出水に含まれるホウ素除去プロセスの開発

    2013.10 - 2014.9

    クリタ水環境科学振興財団  研究助成 

    山村 寛

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    Authorship:Principal investigator  Grant type:Competitive

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  • 新規バイオポリマー吸着剤による膜閉塞抑制手法の開発

    2013.4 - 2014.3

    文部科学省  科学研究費助成事業 研究活動スタート支援 

    山村 寛

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    Grant type:Competitive

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  • Prevention of irreversible membrane fouling by novel biopolymer adsorbent

    Grant number:24860056  2012.8 - 2014.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Research Activity start-up  Grant-in-Aid for Research Activity start-up  Chuo University

    YAMAMURA Hiroshi

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    Grant amount: \2990000 ( Direct Cost: \2300000 、 Indirect Cost: \690000 )

    Application of low pressure driven membranes (i.e., MF/UF) to drinking water treatment has been receiving a lot of attention and is already being practiced all over the world. The main drawback of this technology is membrane fouling, which is a major obstacle to widespread use of this technology throughout the world. In this study, we newly developed a "carbohydrate adsorbent" by using a plastic polymer having high affinity with hydrophilic organic matters and examined their performance.
    A series of batch adsorption experiments showed high performance of the biopolymer adsorbent. It was clarified that the adsorbent have higher affinity for hydrophilic organic matter than for hydrophobic organic matter.
    Pretreatment by adsorption of the raw water for membrane filtration 41% prevented the degree of the physically irreversible fouling.

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  • 微細藻類を利用した石油代替燃料等の製造技術の開発

    2012.4 - 2014.3

    農林水産省  地域資源を活用した再生可能エネルギーの生産・利用のためのプロジェクト 

    原山 重明

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    Grant type:Competitive

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  • 原子間力顕微鏡を用いた膜閉塞抑制手法の開発

    Grant number:20860002  2008 - 2009

    日本学術振興会  科学研究費助成事業 若手研究(スタートアップ)  若手研究(スタートアップ)  北海道大学

    山村 寛

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    Grant amount: \3328000 ( Direct Cost: \2560000 、 Indirect Cost: \768000 )

    本研究では自然水中の有機物(NOM)をコロイド球表面に接着する手法を開発し、前述した手法を基にして、AFMを用いたNOM-膜間の親和性評価手法の確立を目指すことを目的とした。
    タンパク質の膜面吸着に影響を与える因子を検討するために、膜材質の異なる2種類の膜を用いてBSAの膜面への付着力を測定した。膜材質及び溶液のpHがタンパク質の付着力に及ぼす影響を検討した結果、疎水性のPVDF膜と親水性のPE膜を使用した実験では、低pH(pH3)においてPVDF膜においてより強力な付着力が観察されたのに対し、高pH(pH10)ではPE膜の方がPVDF膜よりもタンパク質との親和性が高いことが明らかになった。さらに、Caを溶液に添加し、同様に付着力を測定した結果、PE膜についてのみ付着力が増加する様子が観察された。これは、BSAとPE膜間に静電気力が関与していることを示唆するものである。PVDF膜においては、pHの低下に伴って付着力が上昇したことから、BSAの付着には水素結合の影響が大きいことが推測された。これらのことから、AFMを用いてタンパク質の吸着力を測定出来る可能性が示されたと共に、膜材質がタンパク質の吸着に大きく影響することが明らかになった。
    膜構造の違いが付着力に及ぼす影響を検討した結果、同じ膜材質にも関わらず膜細孔径が異なることで付着力が大きく異なることが示された。今回検討した膜(PTFE)では、細孔径1μmから0.1μmにおいては付着力が上昇した一方で、0.1μmより細孔径が小さくなるにつれて付着力が減少する様子が観察された。このことは特定の大きさの粒子に対して最も付着しやすい膜構造が存在することが考えられる。今後、細孔径種とBSAビーズ粒径を様々に組み合わせて同様の実験を行うことで、膜閉塞に関与する粒径成分と膜構造の関係について、知見を深める予定である。

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  • 原水水質に対応した合理的な膜選択および運転制御理論の確立

    Grant number:06J52032  2006 - 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  特別研究員奨励費  北海道大学

    山村 寛

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    Grant amount: \1900000 ( Direct Cost: \1900000 )

    様々な原水から回収した有機物を用いたベンチスケール膜ろ過実験
    昨年度行ったパイロットスケールろ過実験では、糖類が主なファウリングの原因物質であることが明らかとなった。本年度は昨年度に得られた結果の汎用性を検討するために、日本全国から様々な特性を有する水道水源から有機物を回収し、ベンチスケールろ過実験を行った。回収した有機物を疎水性/弱疎水性/親水性成分に分画したものを原水としてろ過実験を行った結果、どの原水から回収した有機物についても、親水性画分をろ過した際に顕著なファウリングの進行が観察された。疎水性画分をろ過した際には、ファウリングの進行はほとんど観察されなかった。このことは、原水中に含まれる親水性画分が主なファウリングの原因物質であることを示すものである。
    原子間力顕微鏡(AFM)を用いた糖類と膜面間の親和性の評価
    糖類によるファウリング進行メカニズムを検討するために、親水性画分と膜表面との親和性の評価を試みた。糖類中には多くのヒドロキシル基が存在しており、糖類と膜表面との親和性はヒドロキシル基の膜表面への付着力を測定することで評価できると考えられる。そこで本研究では、原子間力顕微鏡を用いて、ヒドロキシル基を修飾したビーズの膜面への付着力を測定することで、糖類と膜面間の親和性を評価した。ヒドロキシル基とカルボキシル基のPVDF膜面への付着力測定した結果、ヒドロキシル基はカルボキシル基よりも遥かに高い付着力を示すことが明らかとなった。これは、ヒドロキシル基と膜面間に水素結合が働いていたことに起因するものと考えられる。ヒドロキシル基の付着力をPVDF膜とPE膜で比較した際には、PVDF膜の方がより高い付着力を示した。過去に行ったパイロットスケール膜ろ過実験では、PVDF膜の方がPE膜と比較してよりファウリングが急速に進行したことから、本研究で行ったAFMによるヒドロキシル基の付着力を測定することで、閉塞しにくい膜の選択が可能になると考えられる。

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Intellectual property rights

  • 炭化処理設備および炭化製品の製造方法

    河野 智弘,北林 誠,加藤 正士

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    Application no:特願2022-122961  Date applied:2022.8.1

    Announcement no:特開2023-024348  Date announced:2023.2.16

    Applicant (Organization):学校法人中央大学,大同特殊鋼株式会社

  • 微細藻類の培養方法及び微細藻類の培養装置

    安保 貴永,中原 禎仁

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    Application no:特願2022-004281  Date applied:2022.1.14

    Announcement no:特開2023-103645  Date announced:2023.7.27

    Applicant (Organization):学校法人中央大学,三菱ケミカル株式会社

  • 微細藻類の培養方法及び微細藻類の培養装置

    安保 貴永,中原 禎仁

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    Application no:特願2022-004280  Date applied:2022.1.14

    Announcement no:特開2023-103644  Date announced:2023.7.27

    Applicant (Organization):学校法人中央大学,三菱ケミカル株式会社

  • 水処理システム及び水処理方法

    丁 青,薮野 洋平,西川 健幸,小松 賢作

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    Application no:特願2020-172681  Date applied:2020.10.13

    Announcement no:特開2022-064136  Date announced:2022.4.25

    Applicant (Organization):学校法人中央大学、株式会社クラレ

  • 水処理方法

    丁 青,西川 健幸,薮野 洋平,小松 賢作

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    Application no:特願2020-002264  Date applied:2020.1.9

    Announcement no:特開2021-109141  Date announced:2021.8.2

    Applicant (Organization):学校法人中央大学、株式会社クラレ

  • 情報処理装置、情報処理方法、及びプログラム

    石井 崇晃,根本 雄一

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    Application no:特願2019-206525  Date applied:2019.11.14

    Announcement no:特開2021-079310  Date announced:2021.5.27

    Applicant (Organization):学校法人中央大学、株式会社前澤工業

  • 生分解性プラスチックの製造方法

    迫 郁弥

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    Application no:特願2019-036208  Date applied:2019.2.28

    Announcement no:特開2020-139078  Date announced:2020.9.3

    Applicant (Organization):学校法人中央大学、株式会社カネカ

  • 情報処理装置、情報処理方法、及びプログラム

    川上 敬,鈴木 昭弘,根本 雄一

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    Application no:特願2019-027113  Date applied:2019.2.19

    Announcement no:特開2020-134284  Date announced:2020.8.31

    Registration no:特許第7289670号  Date registered:2023.6.2 

    Applicant (Organization):学校法人中央大学、学校法人北海道科学大学、前澤工業株式会社

  • ろ過膜、ろ過膜の製造方法及び表面処理剤

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    Application no:特願2018-160846  Date applied:2018.8.29

    Announcement no:特開2020-032358  Date announced:2020.3.5

    Registration no:特許第7239140号  Date registered:2023.3.6 

    Applicant (Organization):学校法人中央大学

  • 水処理システム及び水処理方法

    永里 貴大

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    Application no:特願2018-047324  Date applied:2018.3.14

    Announcement no:特開2019-155299  Date announced:2019.9.19

    Applicant (Organization):学校法人中央大学

  • 排水処理方法及び排水処理装置

    隋鵬哲,平岡 睦久,井上 公平,田口 和之

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    Application no:特願2017-022936  Date applied:2017.2.10

    Announcement no:特開2018-126709  Date announced:2018.8.16

    Applicant (Organization):学校法人中央大学、富士電機株式会社

  • 被処理液の臭気低減方法

    羽深 昭,三木 雄揮

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    Application no:特願2016-228834  Date applied:2016.11.25

    Announcement no:特開2018-083170  Date announced:2018.5.31

    Applicant (Organization):学校法人中央大学、旭化成株式会社

  • 排水処理方法、排水処理装置、及び排水処理用の活性剤

    隋鵬哲,糸川 和芳,平岡 睦久,田口 和之,佐藤 匡則

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    Application no:特願2016-093853  Date applied:2016.5.9

    Announcement no:特開2017-202435  Date announced:2017.11.16

    Registration no:特許第6188864号  Date registered:2017.8.10 

    Applicant (Organization):学校法人中央大学、富士電機株式会社

  • 膜ファウリング抑制材

    渡辺 義公,岩知道 直行,立花 祐貴,前川 一彦

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    Application no:特願2015-228068  Date applied:2015.11.20

    Announcement no:特開2017-94259  Date announced:2017.6.1

    Applicant (Organization):学校法人中央大学、株式会社クラレ

  • 多孔質膜およびその製造方法

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    Application no:特願2015-163373  Date applied:2015.8.21

    Announcement no:特開2017-39874  Date announced:2017.2.23

    Registration no:特許第6592306号  Date registered:2019.9.27 

    Applicant (Organization):学校法人中央大学

  • 有機膜の改質方法、改質有機膜、及び改質装置

    糸川 和芳,中田 栄寿,井上 公平

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    Application no:特願2015-542092  Date applied:2015.8.7

    Announcement no:再公表2015-87635  Date announced:2017.3.16

    Registration no:特許第5908185号  Date registered:2016.4.1 

    Applicant (Organization):学校法人中央大学、富士電機株式会社

  • 芯鞘型複合繊維

    渡辺 義公,岩知道 直行,加藤 康紘,古賀 宣広

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    Application no:特願2015-104733  Date applied:2015.5.22

    Announcement no:特開2016-216862  Date announced:2016.12.22

    Applicant (Organization):学校法人中央大学、株式会社クラレ

  • 水処理安全フィルター

    渡辺 義公,岩知道 直行,加藤 康紘

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    Application no:特願2015-104729  Date applied:2015.5.22

    Announcement no:特開2016-215156  Date announced:2016.12.22

    Applicant (Organization):学校法人中央大学、株式会社クラレ

  • 膜ファウリング原因物質吸着材およびそれを用いた水処理方法ならびに吸着材の再生方法

    渡辺 義公,森川 圭介,立花 祐貴

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    Application no:PCT/JP2015/64635  Date applied:2015.5.21

    Applicant (Organization):学校法人中央大学、株式会社クラレ

  • 水処理方法

    渡辺 義公,森川 圭介,立花 祐貴

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    Application no:特願2014-106855  Date applied:2014.5.23

    Announcement no:特開2017-124341  Date announced:2017.7.20

    Applicant (Organization):学校法人中央大学、株式会社クラレ

  • 水処理方法

    渡辺 義公,森川 圭介,立花 祐貴,涌井 孝,藤原 直樹

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    Application no:特願2014-053176  Date applied:2014.3.17

    Announcement no:特開2017-18844  Date announced:2017.1.26

    Applicant (Organization):学校法人中央大学、株式会社クラレ

  • 水処理方法、水処理用高分子吸着剤、およびその再生方法

    渡辺 義公,森川 圭介,立花 祐貴,涌井 孝,藤原 直樹

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    Application no:特願2014-053175  Date applied:2014.3.17

    Announcement no:特開2017-18843  Date announced:2017.1.26

    Applicant (Organization):学校法人中央大学、株式会社クラレ

  • 親水性高分子吸着剤およびそれを用いた水処理方法

    渡辺 義公,涌井 孝,藤原 直樹,森川 圭介

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    Application no:特願2013-243150  Date applied:2013.11.25

    Announcement no:特開2017-18842  Date announced:2017.1.26

    Applicant (Organization):学校法人中央大学、株式会社クラレ

  • バイオポリマー吸着性組成物、およびそれを用いた水処理方法

    渡辺 義公,涌井 孝,藤原 直樹,森川 圭介

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    Application no:特願2013-243149  Date applied:2013.11.25

    Announcement no:特開2017-19881  Date announced:2017.1.26

    Applicant (Organization):学校法人中央大学、株式会社クラレ

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Committee Memberships

  • 2022.4 - Now

    厚生労働省   水道の諸課題に係る有識者検討会  

  • 2022.4 - Now

    水道技術センター   「水道の基盤強化に資する浄水システムの更新・再構築に関する研究」研究委員会 第2小委員会 委員長  

  • 2020.4 - Now

    造水促進センター   国際標準化 水処理再利用膜のグレード分類 標準化委員会 委員長  

  • 2020.4 - Now

    Water Aid Japan   理事  

  • 2020.4 - Now

    土木学会環境工学委員会   中長期下水道施設システム調査小委員会  

  • 2019.4 - Now

    日本水環境学会 膜を利用した水処理技術委員会   委員長  

  • 2019.4 - Now

    日本水環境学会   男女共同参画担当委員  

  • 2019.4 - Now

    日本下水道新技術機構   下水道技術開発会議エネルギー分科会  

  • 2017.4 - Now

    国土交通省   新下水道ビジョン加速検討委員会  

  • 2016.4 - Now

    水制度改革議員連盟   水循環基本法フォローアップ委員会 幹事  

  • 2016.4 - Now

    水道研究センター   文献抄録委員会  

  • 2022.4 - 2023.3

    東京都下水道局   下水道カーボンハーフ実現に向けた地球温暖化対策検討委員会  

  • 2015.4 - 2023.3

    日本下水道協会   文献抄録委員会  

  • 2019.4 - 2022.3

    日本水道技術センター   「多様な社会・技術に適応した浄水システムに関する研究」浄水技術研究推進委員会  

  • 2019.4 - 2021.3

    高分子学会   高分子と水・分離に関する研究会 運営委員  

  • 2017.4 - 2019.3

    日本水環境学会   戦略委員  

  • 2015.10 - 2017.9

    International Water Association   Steering Committee member of Young water professionals  

  • 2015.4 - 2017.3

    Japan Young Water Professionals   代表  

  • 2015.4 - 2017.3

    日本水環境学会   年会実行委員会  

  • 2015.4 - 2017.3

    日本水環境学会   支部連絡委員会  

  • 2015.4 - 2017.3

    日本水環境学会   広報委員会  

  • 2015.12 - 2016.12

    国土交通省   次世代水ビジョン検討委員会  

  • 2012.4 - 2015.3

    土木学会   全国大会プログラム検討委員会  

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