メタン発酵による酵母廃水の処理

概要

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Yeast waste was treated by mesophilic and thermophilic methane fermentation. The raw waste contained 28,990 ppm of volatile matter, 10,280 ppm of BOD and 4,026 ppm of SO^<-->_4.Digestion studies were conducted at temperature of 37〜38℃ (mesophilic) and 53〜54℃ (thermophilic), and the concentration of the digested sludge in the fermentive fluid was adjusted to 5,10 and 20 vol.% (1,500 G-10 min centrifuged).The maximum loading was 2.90g/l/day as volatile matter in 5 vol.% of sludge, 3.62g in 10 vol.% and 5.07g in 20 vol.%, respectively in case of mesophilic digestion.In case of thermophilic digestion, the maximum loadings were 7.25g in 5 vol.%, 10.15g in 10 vol.% and 13.05g in 20 vol.%.70-80% of the BOD was removed by mesophilic and 40-50% by thermophilic digestion and total and production was 7-9 l per l of added waste.In the fermentive fluid, 200 ppm or more of soluble sulfides were formed by reduction of SO^<-->_4 in raw waste. When the soluble sulfides in the fluid were removed, the gas production was 40% greater than when they were not removed.
社団法人日本生物工学会の論文
1966-12-25