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The start-up of thermophilic anaerobic digestion of municipal solid waste

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Title: The start-up of thermophilic anaerobic digestion of municipal solid waste
Authors: NAKAJIMA, Subaru Browse this author
SHIMIZU, Naoto Browse this author →KAKEN DB
ISHIWATA, Hiroyuki Browse this author
ITO, Tadahiko Browse this author
Keywords: Free ammonia
Production rate
Issue Date: 2016
Publisher: 日本エネルギー学会
Journal Title: Journal of the Japan Institute of Energy
Volume: 95
Issue: 8
Start Page: 645
End Page: 647
Publisher DOI: 10.3775/jie.95.645
Abstract: Thermophilic anaerobic digestion of municipal solid wastes (MSW) was conducted for 6 weeks in a lab-scale semi-continuous digester for investigating the start-up operation of anaerobic digestion treating MSW. The feedstock was a mixture of simulated food waste, paper waste, and in some cases, cow manure. Organic loading rate (OLR) was adjusted 1.14 ~ 4.00 gVS/kg-sludge/day to biogas production. At the initial stage of thermophilic anaerobic digestion, pH value gradually increased from 8.2 to 8.3 on 17th day from start-up. Free-ammonia concentration in the digester also gradually increased from 361.6 to 412.5 ppm. On 17th day, inhibition of free-ammonia occurs, and biogas generation stopped. After gas generation stopped on day 17, pH and free-ammonia concentration were adjusted to the proper level by adding paper and deionized water. As a result, gas generation restarted on day 21. Then the amount of food waste charged in the digester was decreased and that of paper waste was increased to adjust the total amount of nitrogen invested in the digester. Afterwards, pH value was settled around 7.8, and a stable digestion was achieved till the end of experiment. Inhibition of free-ammonia could be suppressed by adjusting the amount of nitrogen invested in the digester.
都市ごみ(MSW)の高温嫌気性消化発酵(メタン発酵)立ち上げ時の実験条件を調べるために,半連続発酵方法を用いて6週間(1期:1~20日,2期:21~46日)メタン発酵が行われた。生ごみ,紙ごみ,そして牛ふん(立ち上げ時)を混合して発酵原料として供試した。有機物負荷量を,1.14~4.00 VS(有機物濃度)/kg-sludge/dayに調製した。高温(52℃)メタン発酵の初期段階(実験開始から17日目)で,発酵液のpHは8.2から8.3に増加し,遊離アンモニア阻害が生じ,バイオガス生成は停止した。17日目以降,紙ごみとイオン交換水を用いて発酵液のpHと遊離アンモニア濃度を適性値に調整した。その結果, 21日目以降,ガス生成が再び始まった。発酵液の全窒素濃度を調整するために,生ごみ量を減らし,紙ごみ量を増やして原料を供給して発酵試験を進めた。pHは7.8付近を推移,試験終了まで安定的に発酵が行われた。遊離アンモニアによる阻害は,発酵液における窒素量を制御することにより抑えられると考えられる。
Rights: 著作権は日本エネルギー協会にある。本文データは学協会の許諾に基づきCiNiiから複製したものである。
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 清水 直人

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