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One of the alternative sources for clean energy is biogas. Generating energy from agrowaste and effluents can lessen environmental impacts. This study was conducted to determine the production of biogas from six potential substrates, i.e. goat dung (GD), chicken dung (CD), fish waste (FW), rice waste (RW), palm oil mill effluent (POME) and sewage sludge (SS) using industrial inoculum as catalysts. Biophysical characteristics were assessed using laboratory-based analyses, whereas the Bio-Methane Potential (BMP) assay was used to measure anaerobic biogas production in mesophilic condition for 20 consecutive days. Results revealed that rice waste with industrial inoculum produces the highest amount of biogas, followed by goat dung, chicken dung, fish waste, palm oil mill effluent and sewage sludge with total amount of 3508.9 mL, 2141 mL, 1885.7 mL, 1546.0 mL, 743.8 mL and 547.7 mL, respectively. In conclusion, all substrates used in this study can be combined with industrial inoculum would serve producing energy in a small-scale industry.

Abstract. The aims of this study were, i) to determine the biophysical characteristics of the substrate using Chemical Oxygen Demand (COD), nutrient, heavy metal, Carbon to Nitrogen and Ammonianitrogen content analyses, and ii) to compare the biogas production between goat dung and chicken dung using industrial inoculum and traditional bokashi as catalyst. Bio-Methane Potential (BMP) test was used to measure biogas production in mesophilic condition for time duration of 20 days. The goat's dung produced 2141 mL of biogas, higher than 1885.7 mL that of chicken dung using industrial inoculum . It was found that goat dung and chicken dung can be used as an energy source in a small scale industry as compared to the traditional bokashi where no methane gas was produced from the substrates.

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