Abstract
Co-digestion of sewage sludge and other organic wastes is a promising technology, but performance of the co-digestion might be different in different sewage treatment plants. Characteristics of sewage sludge were analyzed and its anaerobic digestion performance was evaluated by batch experiments in eight sewage treatment plants all over Japan. The methan conversion ratio of the mixed sludge was around 0.6. The TCODCr/VS and PCODCr/VSS ratios of the mixed sludge and the digested sludge were around 1.7. The effect of co-digestion with synthetic food waste was similar in different plants. These results can be used to estimate co-digestion performances in different sewage treatment plants.
