Development of a method for provision of methane fermentation bacteria to raw material in dry process

• Project/Area Number: 16K07964
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Agricultural environmental engineering/Agricultural information engineering
• Research Institution: National Agriculture and Food Research Organization
• Principal Investigator: Yamaoka Masaru 国立研究開発法人農業・食品産業技術総合研究機構, 農村工学研究部門水利工学領域, ユニット長 (70373222)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 乾式メタン / 作物残渣 / バイオマス / 乾式メタン発酵 / ラボスケール / 稲わら / 再生可能エネルギー

Outline of Final Research Achievements

The purpose of this study is to expand the utilization of the agricultural residues or non-edible portions of agricultural products. The dry methane fermentation process is one effective option to utilize them. However, the dry methane fermentation process needs the improvement in provision of methane fermentation bacteria to raw material to accept them easily.
The extracted solution from fermented residue of a laboratory-scale methane fermentation process was added to the feedstock of dried rice straw and measured methane gas production. Finally，a new type fermenter that can extract the solution from fermented residue and add it to the feedstock of dried rice straw continually was developed. The new type fermenter produced methane gas steadily without stirring in the fermenter.

Academic Significance and Societal Importance of the Research Achievements

メタン発酵の原料に，容易に発酵微生物群の移植し，メタン発酵を発現・継続させることは，原料周辺の局所的な空間で見ると，極めて高負荷な状態でのメタン発酵の実現となる。このため，本技術はメタン発酵プロセスの大幅な効率化をもたらすことが期待できる。
作物残渣を原料とする場合，収穫後の短期間に原料となる作物残渣が発生する。高負荷な状態で短期間にメタン発酵を進行させる技術は，作物残渣のような原料供給量の大きな変動に対応して効率的にメタン発酵を行うために必要な技術である。本研究は，その端緒として意義深い。

Research Products

• [Journal Article] 小規模メタン発酵実験用のバイオガス体積のための簡易測定器の試作と測定精度の検証 (2018)
  • Author(s): 山岡 賢，中村真人，折立文子
  • Journal Title: 農業農村工学会論文集 Volume: 307(86-2)
  • NAID: 130007468780
  • Peer Reviewed / Open Access
• [Presentation] 稲わらを原料とした乾式メタン発酵室内実験の発酵立ち上げ (2017)
  • Author(s): 山岡 賢・中村真人・折立文子
  • Organizer: H29農業農村工学会大会講演会
• [Presentation] Study on Starting Up Dry Methane Fermentation for Agricultural Residues (2017)
  • Author(s): Masaru YAMAOKA, Masato NAKAMURA, Fumiko ORITATE
  • Organizer: 2017 International environmental engineering conference
  • Int'l Joint Research