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No.37 (1990/12) >

 
Title :泡盛蒸留廃液のメタン発酵(農芸化学科)
Title alternative :Methane fermentation of alcohol stillage derived from fermented awamori mash (Department of Agricultural Chemistry)
Authors :当山, 清善
石原, 昌信
Authors alternative :Toyama, Seizen
Ishihara, Masanobu
Issue Date :5-Dec-1990
Abstract :200ml容注射筒及び0.6m^3容大型発酵槽を用いて泡盛蒸留廃液を基質としたメタン発酵を行い,ガス発生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)への最適基質添加量は有機物として約9.9g1lであり,最適初発pHは7∿8であった。発酵液へ有機物として0.66g(1.32%)以上加えるとガス発生量及びガス中のメタン含量は著しく減少した。中温発酵(37℃)及び高温発酵(50℃)における発生ガス量は有機物1g当たり930∿1000mlであり,発生ガス中のメタン含量は67∿69.5%であった。発酵初期には主に酢酸及びプロピオン酸の生成,蓄積量が多く,発酵の進行に伴ない徐々に減少した。大型発酵層を用いた中温メタン発酵を行なった結果,発酵7日間で有機物1kg当たり810.7lのガスが発生し,発生ガス中のメタン含量は70%であった。
Methane fermentation of alcohol stillage derived from fermented awamori mash was examined by using both 200-ml syringe and 0.6m^3-pilot scale fermentor containing the sludge which were previouly acclimated to the stillage. The maximum loading was about 9.9g per L as organic matter of the stillage in 20% sludge (wet. weight), and the most favorable pH for the fermentation was 7 to 8. Gas evolution and methane content decreased significantly when the amount of loading was above 0.66g (1.32%, w/v) as organic matter of the stillage. The total gas evolved from the stillage in 10 days of fermentation was 930-1000ml containing 67-69.5% methane per g of organic matter under mesophilic (37℃) and thermophilic (50℃) conditions. Acetic and propionic acids mainly accumulated in the mash in the early stage of fermentation and decreased gradually during further fermentation. Also, mesophilic methane fermentation was carried out by using pilot-scale fermentor and yielded 810.7L of gas with methane ratio of 70% per Kg of organic matter in 7 days of fermentation.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3855
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.37 p.19 -25
Appears in Collections:No.37 (1990/12)

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