Abstract:
The objective of this study was to investigate biogas production from concentrated food
waste by using anaerobic continuous stirred tank reactor (CSTR) under mesophilic operation
without pH control at different chemical oxygen demand (COD) loading rates. The main
components of biogas were methane and carbon dioxide. Under optimum COD loading
rate of 8.71 kg/m3d (Hydraulic retention time, HRT = 3.15 day), the system provided
the highest biogas production performance in terms of the highest methane yield
(14.52 ml CH4/g COD removed or 1.13 ml CH4/g COD added) and the highest specific
methane production rate (SMPR) (0.48 ml CH4/g MLVSS d or 8.50 ml CH4/L d) which
was consistent with the maximum COD removal of 38, and 79.25 % of lipid could be break
down under the studied condition.