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No.32 (1985/12) >

Title :甘藷芋アルコール蒸留廃液のメタン発酵 : 第 1 報小型容器を用いた発酵(農芸化学科)
Title alternative :Methane fermentation of alcohol stillage derived from sweet potato tubers : (I) Small-scale methane fermentation (Department of Agricultural Chemistry)
Authors :当山, 清善
石原, 昌信
大久保, 勉
与那覇, 和雄
Authors alternative :Toyama, Seizen
Ishihara, Masanobu
Ohkubo, Tsutomu
Yonaha, Kazuo
Issue Date :2-Dec-1985
Abstract :生甘藷を原料としたアルコール蒸留廃液を馴養したスラッジと混合しpH7.5,37℃でメタン発酵を200ml容注射筒を用いて行ない, ガス生成過程, 発生ガス量及び発生ガス中のメタン含量等について調べた。発酵液(20%スラッジ, 湿重)中の蒸留廃液濃度は有機物として1.3∿1.5%が最適で, 60%のメタンを含むガスが発生した。ガス発生量は, スラッジ濃度が20%までは廃液量とスラッジ濃度との間に直線関係が得られた。最適発酵温度は37℃で, 最適発酵pHは7∿9付近であった。蒸留廃液を10日間メタン発酵して得られる総発生ガス量は蒸留廃液中の有機物g当り698mlで, メタン含量は62%であった。発酵3日目に有機酸の蓄積量が最高値に達し, その組成は酢酸 : プロピオン酸 : 酪酸(71 : 15 : 14)であった。また, 蒸留廃液を10日毎および5日毎, 半連的に添加した発酵で発生したガス量は有機物g当り792mlで, メタン含量は58%であった。
The alcohol stillage derived from raw sweet potato tubers which were fermented by using enzymes without cooking was subjected to methane fermentation. The methane fermentation was carried out at 37℃ and 7.5 of pH in a 200-ml syringe containing the sludge which was previously acclimated to the stillage, and the evolutions and composition of the gas produced, volatile acids and pH were followed. High yield of gas generation with a methane ratio of 60% was obtained in the fermentation at 37℃ for 10 days with 1.3-1.5% organic matter of the stillage. The amount of gas evolved in the fermentation with 20% of sludge increased with an increased in the amount of the stillage. The most favorable temperature and pH for the fermentation were 37℃ and 7.0 to 9.0,respectively. The total gas evolved from the stillage in 10 days fermentation was 698ml per g of organic matter, and the methane content was 62%. Acetic, propionic and butyric acids acumulated in the mash after 3 days of fermentation and decreaced gradually as the fermentation progressed. When fermentation was carried out by the addition of the stillage at 5-day intervals, the total gas evolved was 792ml per g of organic matter with a methane content of 58%.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3938
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.32 p.55 -62
Appears in Collections:No.32 (1985/12)

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