研究者詳細 - 中村　一穂

論文 - 中村　一穂

件数 77 件

Monitoring of MBR fouling properties by filtration resistance and zeta potential measured for both filtration and backwashing directions

Gagandeep Kaur, Kazuho Nakamura, Kentaro Ogawa, Kenji Wakui

Journal of Membrane Science 675 ( 5 ) 121550 2023年3月 [査読有り]

DOI Web of Science CiNii Research

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier 単著

Membrane Bioreactor (MBR) being the promising and sustainable technology, will be highly in demand in future. To monitor the inline status of fouling, in order to make the process more economical, novel fouling monitoring indexes based on the differences in filtration properties between the filtration direction and backwashing di-rection were developed. The module clogging and fouling properties were monitored by direct visual observation of filtration surface, filtration resistance and zeta potential for both directions in a lab scale MBR using alumina tubular microfiltration membrane having pore size of 0.2 mu m. The optimal clearance size of flow channel in membrane module for avoiding clogging by sludge cake was determined at 5 mm by the visual observation. The filtration resistance for filtration direction, RF, increased steeply in later stage of operation while that for backwashing direction, RB, showed a gradual increasing throughout operation. This difference between RF and RB was elucidated by a model where the sludge cake behaves like a "check valve". The analysis of cleaning experiments of fouled membrane with the resistance in series model also supported the model of the sludge cake behavior and showed that the resistance caused by sludge cake, Rcake, dominated RF and had no impact on RB. This analysis also showed that Rcake and the resistance caused by macromolecule adsorption, Radsorption, which are important factors for recognizing fouling status, can be evaluated from RF and RB, which are easy to monitor during operation, without cleaning experiments. The zeta potential also depended on the measurement direction and showed a decreasing trend with the increase in filtration resistance.

Effects of Pore Size and Surface Modification on the Alumina Microfiltration Membrane Fouling in MBR with Backwashing

Gagandeep Kaur, Kazuho Nakamura, Kentaro Ogawa, Kenji Wakui

Journal of Chemical Engineering of Japan 57 ( 1 ) 2024年10月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）単著

Effects of Operating Conditions on Properties of Fouling and Energy Consumption in Membrane Bioreactor with Backwashing

Gagandeep Kaur, Kazuho Nakamura, Kentaro Ogawa, Aritro Sinha, Kenji Wakui

膜 49 ( 5 ) 273 - 281 2024年10月 [査読有り]

DOI CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：日本膜学会単著

Energy optimization in Membrane Bioreactors (MBRs) is essential to facilitate the widespread adoption of this technology for wastewater treatment. This research examined various operating conditions and commonly employed fouling mitigation techniques to assess their impact on the lifespan of porous alumina microfiltration membranes and energy consumption over the operation cycles in MBRs with backwashing. Parameters studied include frequency of backwashing tcycle (30 to 120 min), backwashing duration tbackwashing (1 to 10 min), backwash flow rate Qbackwashing (1 to 5 mL/min), filtration flow rate Qfiltration (1 to 3 mL/min), air circulation flow rate Qair, module (0 to 300 mL/min), and MLSS (2000 to 8000 mg/l). Filtration resistance, measured over the operation time, exhibited a typical two–stage behavior. Membrane fouling rates varied under different conditions. Operations showing lesser fouling rates were not always found to be the most energy efficient. Energy consumption during the filtration period Efiltration is the major contributor to the total energy consumption Etotal.

Closing the loop on biohydrogen production: A critical review on the post-fermentation broth management techniques

Tiwari, A; Nakamura, K

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 81 595 - 614 2024年9月

DOI Web of Science

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

Improving Hydrogen Fermentation Performance by Co-Culturing Clostridium perfringens with Megasphaera elsdenii

Hongo Atsushi, Nakamura Kazuho, Ohkoshi Yuto, Hikosaka Riki, Wakui Kenji, Tanisho Shigeharu

Journal of Environmental Biotechnology 23 ( 1 ) 63 - 68 2023年6月 [査読有り]

DOI CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：NPO法人環境バイオテクノロジー学会共著

To realize a hydrogen society, methods to produce hydrogen in an environmentally friendly manner like hydrogen fermentation using biomass waste are required. In this study, we developed a new approach for producing bio-hydrogen at a lower CO2 emission using two types of bacteria. To improve hydrogen yield and NaOH consumption, which causes CO2 emission according to a life cycle assessment of process, a co-culture system of Clostridium perfringens HN001, which produces lactate as a by-product of hydrogen, and Megasphaera elsdenii JCM1772, which produces hydrogen from lactate, was designed based on lactate metabolism. In a pure culture of M. elsdenii, lactate was preferentially consumed over glucose, and the production of hydrogen from lactate was confirmed. In a pure culture of C. perfringens, the production of lactate as a by-product of hydrogen was observed. In the co-culture system of C. perfringens and M. elsdenii, an increase of 131% in hydrogen yield and a reduction of 58% in NaOH consumption were achieved compared to those in the pure culture of C. perfringens due to the conversion of lactate to hydrogen by M. elsdenii. This result demonstrates that the co-culture system contributes improvement of hydrogen yield and reduction of CO2 emission from fermentation process.

水の分離に関わる単位操作

中村一穂

化学と教育 70 ( 8 ) 392 - 395 2022年8月

DOI CiNii Research

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本化学会単著

きれいな水を製造するためには水と不純物とを分離する必要がある。ここでは，水の分離に関わる単位操作として，イオン交換，蒸留，沈降を紹介する。各単位操作において，分離を行うための水と分離対象物質の物理化学的性質と分離原理，具体的な操作・装置について解説する。

The face behind the Covid-19 mask - A comprehensive review

Ganesapillai Mahesh, Mondal Bidisha, Sarkar Ishita, Sinha Aritro, Ray Saikat Sinha, Kwon Young-Nam, … 全著者表示

ENVIRONMENTAL TECHNOLOGY & INNOVATION 28 2022年8月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

An experimental study probing moisture kinetics and indices of microwave dried fecal sludge with an insight on real world applications