ヤギ糞の嫌気性発酵処理における発酵特性と消化液の利用

概要

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It is important to adopt waste treatment methods and to understand material flow for the creation of a recycling society. We ran anaerobic fermentation in goat-feces in order to understand treatability. In addition, analyzed the fertilizer component of the digested sludge produced by anaerobic fermentation and considered using sludge for cultivation of plants. Initially, we compared the character of feces in some livestock, then realized that goat-feces were similar to cow-feces in low fertilizer component, high C-N ratio, and total solid rate. In the case of short hydraulic residence time of anaerobic fermentation in goat-feces, thermophilic fermentation was better than mesophilic in terms of gas production. The properties of digested sludge were mildly alkaline, about 60% volatile solids and 2-3% total solids in sully form. The sludge contained a fertilizer component especially high in N and K. The collection rate of elements in supernatant liquid of digested sludge was high in N and K but low in P and Ca due to settling out. The supernatant liquid of degested sludge is more suitable than using the digested sludge for hydroponic culture. Compared to the wet oxidation process liquid, the supernatant liquid of digested sludge has no advantage over the collection rate of K and Ca but exceeds in N.
生態工学会の論文
2008-10-31