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A huge production of palm oil mill effluent (POME) and empty fruit bunches (EFB) from palm oil mills become a serious problem, nowadays. Many methods are already studied to utilize these side products in various applications; one of them is the conversion of POME and EFB to biogas. In this study, the effect of mixing ratio of POME and EFB substrate on biogas production was investigated. The experiment was performed in a batch reactor with a working volume of 6 liters of the reactor under thermophilic temperature (55C). Experiments were conducted by varying the ratio of POME and EFB (20:1, 25:1, 30:1, 35:1, and 40:1). Co-digestion POME and EFB with mixing ratio 35:1 was considered as the suitable ratio which reaching highest gas production of 80.30 L/mg.VS , highest COD reduction of 63.1%, and highest methane content of 80.10% .

PRODUCTION OF BIOGAS FROM CO-DIGESTION OF EMPTYFRUITBUNCHES (EFB) WITH PALM OIL MILL EFFLUENT (POME): EFFECT OF MIXING RATIO