Abstract
Hydrolysis is the most rate limiting step in almost all anaerobic digestion systems. To tackle long time duration, ultrasonic pretreatment proved that it can effectively improve biogas yield efficiency by effecting on soluble particles. In this study, the effect of three different ultrasonic power densities (0.2W/mL, 0.4W/mL and 0.6W/mL) at three different times (10min, 20min and 30min) on biogas yield of organic fraction of municipal solid waste (OFMSW) at three different total solid content (6%, 8% and 10%) were analyzed. Results showed significant (p<0.01) effect of both sonication density and time of sonication on biogas final yield and biogas yield after 72h digestion with the 6% TS content. Parameters like specific energy input and total volatile fatty acid (TVFA) content were also evaluated to find the best sonication treatments for OFMSW. For lower TS contents (6% and 8%), sonication treatment significantly (p<0.01) increased TVFA concentration before digesting. It is also proved that specific energy input between 5000kJ/kgTS and 10,000kJ/kgTS can effectively increase the biogas yields, especially for 6% TS content, and caused maximum biogas yield produced after 72h of digestion.
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