Biochemical methane potential(BMP)from anaerobic co-digestion of sewage sludge and decanter cake

摘要

Nowadays,anaerobic co-digestion has become a focus of interest in generating methane gas for electricity supply.In this study,a biochemical methane potential(BMP)test was conducted to determine biogas production potential from anaerobic co-digestion of sewage sludge and decanter cake.Sewage sludge has high organic content and decanter cake has a high carbon content(42.70%).Batch fermentation were performed in 125mL serum bottle with 100 mL working volume and incubated for 10 days at mesophilic temperature(38°C)in a water bath.Each bottle containing sewage sludge and decanter cake at feedstocks to inoculums(F/I)ratios of 1:0,1:1 and 2:1.Daily biogas productions were collected using water displacement method.The highest cumulative biogas produces 0.25 L per day at the F/I ratio of 1:1.However,it was observed that the anaerobic co-digestion of sewage sludge with decanter cake at F/I ratio 2:1 provides higher methane yield production than that provided by the sewage sludge alone(1:0)and F/I ratio of 1:1.The results obtained revealed that the co-digestion of sewage sludge and decanter cake has a potential to produce methane.