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Innovation of waste-to-energy system by upgrading anaerobic digesters for sewage sludge

Research Project

Project/Area Number 19K23528
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0303:Civil engineering, social systems engineering, safety engineering, disaster prevention engineering, and related fields
Research InstitutionTohoku University

Principal Investigator

Qin Yu  東北大学, 工学研究科, 助教 (80853241)

Project Period (FY) 2019-08-30 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords下水汚泥 / 嫌気性消化 / 水素発酵 / メタン発酵 / 熱処理 / 後処理 / 循環式二相消化 / 混合消化 / メタン / 水素 / 嫌気性 / ハイタン / 二相消化 / 循環
Outline of Research at the Start

本研究は既存下水汚泥嫌気性消化槽のポテンシャル拡大に着目し、混合発酵法と消化液後処理の導入によって地域の廃棄物エネルギー化システムの効率化について考察し、実用化に向けた技術システムの確立と効率化を目指す。具体的には、回分実験と連続実験により混合発酵法と消化液後処理の最適化条件を求め、既往に開発された低コスト水素発酵の要素技術と組合せ、微生物群集構造解析および数理モデリングによりメカニズム解明を行う。本研究によって、消化槽を新築せずに地域廃棄物と消化残渣を削減すると共に、既存嫌気性消化槽より地域エネ自給率を向上でき、環境と社会発展の好循環を実現できる。

Outline of Final Research Achievements

This study focuses on expanding the potential of the existing anaerobic digester for sewage sludge, discussing the efficiency improvement of the waste-to-energy system by introducing the co-digestion method and post-treatment, and aiming at establishing a practical system. First, the effect of thermal post-treatment of digestate was examined by batch tests. The optimal condition was confirmed as 80°C for 60 min, improving methane yield by about 15%. Then, co-digestion of sewage sludge and paper waste was conducted by the continuous experiment. The optimal condition was obtained when solid content was added to 10% and the difference of mechanism in different processes was investigated. Moreover, the low-cost hydrogen fermentation process was operated. The effect of recirculation ratio on the process was investigated and the distributions of degrading activity and microbial community were discussed.

Academic Significance and Societal Importance of the Research Achievements

本研究の成果は実用化できれば、従来の下水処理場に比べて、大幅なコストダウンが実現でき、下水処理場より余剰電力を売電することが可能となる。このような経済性の高い革新的な技術を普及することで、エネルギー消耗を低減でき、環境負荷低減、地域の活性化、自然との共生や循環型社会の形成などの課題にも貢献可能となる。この効率的な廃棄物エネルギー化システムは日本社会の長期発展による脱炭素社会へ移行する際、今後の国際的な発展潮流を牽引していく技術の一つになると信じる。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (11 results)

All 2021 2020 2019

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (8 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Improvement of coffee grounds high solid thermophilic methane fermentation by co-digestion with in-situ produced waste activated sludge: Performance and stability2021

    • Author(s)
      Zhang Tao、Tonouchi Kazuki、Kong Zhe、Li Yemei、Cheng Hui、Qin Yu、Li Yu-You
    • Journal Title

      Science of The Total Environment

      Volume: 765 Pages: 142551-142551

    • DOI

      10.1016/j.scitotenv.2020.142551

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] High solid mono-digestion and co-digestion performance of food waste and sewage sludge by a thermophilic anaerobic membrane bioreactor2020

    • Author(s)
      Li Yemei、Cheng Hui、Guo Guangze、Zhang Tao、Qin Yu、Li Yu-You
    • Journal Title

      Bioresource Technology

      Volume: 310 Pages: 123433-123433

    • DOI

      10.1016/j.biortech.2020.123433

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 生ごみと紙ごみの中温メタン発酵に及ぼす紙比率と水理的滞留時間の影響2020

    • Author(s)
      朱 愛軍、覃 宇、呉 競、李 玉友
    • Journal Title

      用水と廃水

      Volume: (印刷中)

    • NAID

      40022269504

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 回分実験に基づいた食品廃棄物によるバイオガス発電施設の評価2021

    • Author(s)
      田付春凪、朱愛軍、覃宇、李玉友
    • Organizer
      第55回日本水環境学会年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] メタン生成ポテンシャルに基づくバイオガス発電施設の評価2021

    • Author(s)
      田付春凪、朱愛軍、覃宇、李玉友
    • Organizer
      令和2年度土木学会東北支部技術研究発表会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Adjusting Recirculation Ratio in a Two-Phase Anaerobic Process for the Co-Production of Hydrogen and Methane2020

    • Author(s)
      Yu Qin, Aijun Zhu, Yu-You Li
    • Organizer
      The 6th International Conference on Low Carbon Asia & Beyond
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] BioH2 and bioCH4 recovery by recirculated temperature-phased anaerobic co-digestion of food waste and paper waste2019

    • Author(s)
      Yu Qin, Lu Li, Jing Wu, Benyi Xiao, Toshimasa Hojo, Kengo Kubota, and Yu-You Li
    • Organizer
      The 16th IWA World Conference on Anaerobic Digestion
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Anaerobic Co-Digestion of Paper Waste and Sewage Sludge: the Effects of Paper Waste Ratio2019

    • Author(s)
      Aijun Zhu, Yu Qin, Jing Wu, Yu-You Li
    • Organizer
      The 7th International Symposium on Water Environment Systems
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 熱処理を導入した下水汚泥の嫌気性膜分離法処理における効率化に関する研究2019

    • Author(s)
      佐々木萌波, 李玉友, 覃宇
    • Organizer
      第12回廃棄物資源循環学会東北支部 & 第7回日本水環境学会東北支部合同研究発表会
    • Related Report
      2019 Research-status Report
  • [Presentation] 汚泥の熱処理を取り入れた嫌気性MBR法処理の効率化研究2019

    • Author(s)
      佐々木萌波, 李玉友, 覃宇
    • Organizer
      土木学会東北支部技術研究発表会
    • Related Report
      2019 Research-status Report
  • [Presentation] 後熱処理を導入した下水汚泥の嫌気性膜分離法処理における効率化2019

    • Author(s)
      佐々木萌波, 李玉友, 覃宇
    • Organizer
      第54回日本水環境学会年会
    • Related Report
      2019 Research-status Report

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Published: 2019-09-03   Modified: 2022-01-27  

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