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Investigation of membrane fouling mechanism in MBRs focusing on fine particles outside sludge flocs

Research Project

Project/Area Number 17K14747
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Civil and environmental engineering
Research InstitutionThe University of Tokyo

Principal Investigator

Tobino Tomohiro  東京大学, 大学院工学系研究科(工学部), 講師 (90624916)

Project Period (FY) 2017-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2017: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords膜分離活性汚泥法 / ファウリング / 微粒子 / 蛍光染色 / フローサイトメトリー / 多変量解析 / フローサイトメーター / 膜ファウリング / 活性汚泥 / 下廃水処理
Outline of Final Research Achievements

As a factor affecting the membrane fouling of membrane bioreactors (MBRs), this study focused on fine particles of biological origin existing outside activated sludge flocs and developed a method to characterize and quantify the particles by size and composition. By three axes of size, nucleic acids and membrane lipids, bacterial cell particles of different compositions could be detected as different peaks. Application to the supernatant of bench-top MBRs revealed that the profile of fine particles showed dynamic change through the period and had a strong association with the change in membrane filterability of the sludge.

Academic Significance and Societal Importance of the Research Achievements

膜分離活性汚泥法は高度な水質の処理水を得ることのできる下廃水処理技術であるが、膜目詰まりの効率的な制御が課題となっている。本研究により、汚泥フロック外の微粒子とろ過性との強い関連が明らかとなったことから、膜目詰まり機構および制御のための新規指標として活用可能と考えられる。また、これまでほとんど着目されてこなかったフロック外の微粒子および微生物群集組成に着目し、そこでダイナミックな変化が生じていること等、学術的に新規な知見を得ることができた。

Report

(3 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • Research Products

    (5 results)

All 2019 2018

All Presentation (5 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Presentation] Relationship of fine particles characterized by flow cytometry with filterability of activated sludge in membrane bioreactors2019

    • Author(s)
      Nana YAMAGUCHI, Tomohiro TOBINO, Miina YANAGIHARA, Fumiyuki NAKAJIMA
    • Organizer
      Water and Environment Technology Conference 2019
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Detection of fine particles of microbial origin in activated sludge by fluorescent staining and flow cytometry2018

    • Author(s)
      Yamaguchi, N., T. Tobino, F. Nakajima, K. Yamamoto
    • Organizer
      The 5th Asian Conference on Safety and Education in Laboratory
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] MBR中に存在するアシルホモセリンラクトン類濃度の定量と膜間差圧変化との関係2018

    • Author(s)
      八木大輔, 飛野智宏, 中島典之, 山本和夫
    • Organizer
      第52回日本水環境学会年会
    • Related Report
      2017 Research-status Report
  • [Presentation] アシルホモセリンラクトンの添加および分解操作が精密ろ過膜面上の汚泥ケーキ層形成過程に及ぼす影響2018

    • Author(s)
      岡本紫音, 飛野智宏, 中島典之, 山本和夫
    • Organizer
      第52回日本水環境学会年会
    • Related Report
      2017 Research-status Report
  • [Presentation] Monitoring quorum sensing signaling molecules in MBRs2018

    • Author(s)
      Tomohiro Tobino
    • Organizer
      The 3rd International Forum on Asian Water Environment Technology
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2017-04-28   Modified: 2020-03-30  

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