Keywords: agricultural waste, biogas production, global warming, Jatropha curcas, methane yield, solid content, anaerobic conversion, chemical oxygen demand, COD removal
Effect of the solid content on biogas production from Jatropha curcas seed cake
Anaerobic conversion of Jatropha curcas seed cake was studied in a fivelitre working volume batch reactor at 30°C. Over a 60day operating period, a slurry of seed cake in water at a 1 : 20 seed caketowater ratio showed the highest methane yield of 296 litre methane/kg Chemical Oxygen Demand (COD) degraded (or 156 litre/kg of Jatropha curcas seed cake added) and achieved 52% COD removal. The results revealed that Jatropha curcas seed cake treated anaerobically can be a good source of methane, with optimal seed caketowater ratio in the range of 1 : 20 to 1 : 10.