Shingo Shimohoki

Evaluation of applicability of Organic Fraction of Municipal Solid Waste (OFMSW) for methane fermentation by batch anaerobic digestion

Akiyoshi Ohasi, Hideki Harada

Batch anaerobic digestions were focused on to evaluate biodegradability of OFMSW and Squid waste.
Experiment 1 OFMSW; Food waste, Glycerin, Garbage and Cow dung were mixed as substrate without solid. Batch anaerobic digestion was carried. 0.56 (ml/mg substrate VS) of CH4 was obtained. Then, biodegradability of each substrate was evaluated by another batch experiment. Most of Food waste; Glycerin and Garbage were converted into CH4. And the converted rate of Cow dung, which contained fibers, into CH4 was only 40%.
Experiment 2 Squid waste; Batch anaerobic digestions were carried out to evaluate biodegradability and effect of F/M. Most of substrate was converted into CH4 at design of F/M < 0.5, and biodegradation was not showed at F/M >: 1.0. Maximum CH4 production 0.5 (ml/mg substrate VS) was obtained. Batch co-digestion of squid with garbage was carried out. Most of mixed substrate was converted into CH4 at design of co-digestion as contrasted with single digestion of squid waste was not. Co-digestion showed biodegradation 15 days earlier than single digestion to reach 80 % conversion. Batch co-digestion of squid, garbage and sewage sludge was carried out. The maximum CH4 production 0.47 (ml/mg substrate VS) was obtained from design of squid: garbage: sewage sludge = 1:1:5. The result showed that addition of sewage sludge promotes biodegradation.