Mesophilic and Thermophilic Methane Fermentations of Slop Waste

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Mesophilic and thermophilic methane fermentations of slop waste from molasses were studied under semi-continuous and continuous conditions using a 5-l jar fermentor, and a small increase of gas production and loading of volatile solids (VS) were observed in the continuous thermophilic fermentation.Gas production of the semi-continuous mesophilic (37℃) and thermophilic (55℃) fermentations were 42.0 l (CH_4,52-64%) and 64.8 l (CH_4,52-68%), repectively, from 1 l of slop waste for 3 days' incubation. Gas production and COD_<Mn> reduction rate constants of the semi-continuous mesophilic fermentation were 0.203-0.610 day^<-1> and 1.80-3.00×10^<-4> day^<-1>. These rate constants for thermophilic fermentation were 0.189-0.523 day^<-1>, and 2.18-3.00×10^<-4> day^<-1>. These rate constants of continuous thermophilic fermentation were 0.297-0.460 day^<-1> and 1.50-2.98×10^❲-4❳ day^<-1>. Maximum loading of VS in the thermophilic fermentations was 24 g per l per day, and the gas evolution from 1 g of VS was 1.36 times larger than that of the mesophilic fermentation.
公益社団法人日本生物工学会の論文
1985-12-25