Biomechanization potential of organic fraction of municipal solid waste (OFMSW) from co-digestion of PIG and COW DUNG

The production of biogas, an alternative source of renewable energy from biomechanization of (OFMSW) were studied in different reactors (A-D) using a 5-liter digester at room temperature for a period of 30 days. The OFMSW were co-digested with pig and cow dung as inoculum. OFMSW addition was varied through proximate analysis determination for design dry weight of 6g, 16g, 18g and 26g for a fixed amount of pig and cow dung until maximum biogas production was achieved. The determined empirical formular of the OFMSW through ultimate analysis were A(C₅₇₅H₄₃₀₀O₃₀₀N_12.5,S), B(C₅₉₀H₉₄₀O₄₃₀N₆S), C(C₆₇₀H₁₀₅₀O₄₆₀N₂₀S), D(C₅₀₀H₇₇₀O₃₂₀N₁₀S). Biogas production was measured indirectly by water displacement method. The experimental result for digester D with 26g of OFMSW gave a higher value of 2.31L. The predictive result of OFMSW showed a parabolic relationship with a maximum volume of 2.52L and a mass of 68g beyond digester D. The actual digester potential was determined using modified first order equation to adequately described the cumulative biogas production from these digesters. It was observed that the rate of substrate biodegradability and removal of the biodegradable fractions of the substrate could be obtained by plotting 1/t ln (dyt/dt) against the inverse of time of digestion. This modified first order model showed that digester containing 30g pig dung, 30g cow dung and 26g municipal solid waste had the highest short term anaerobic biodegradability index (STABI) of 6.973 and removal rate constant of -0.013 at room temperature.