Production of Biogas and Compost from Fermented OPEFB used for Straw Mushroom Planting

Abstract

This research aims to determine the effect of adding various decomposers on making biogas and compost from Oil Palm Empty Fruit Bunches (OPEFB) used for straw mushroom production. Method The treatment comprised the addition of five different decomposers. The decomposers used were (1) Control (addition of water), (2) 1,150 grams of cow dung as manure, (3) Waste activated sludge (WAS) from palm oil mill effluent (POME) 700 grams, (4) Giving EM4 68 ml, (5) 2,720 ml of palm oil mill effluent (POME). The parameters observed include temperature, pH, C/N ratio, biogas volume, biogas composition (CH4, CO2, and N2), and compost composition. The results showed that the highest biogas production occurred with the addition of an f EM4 decomposer, and the methane gas content reached 51.2% at 30°C process conditions, pH 7, and C/N ratio of 26.63. The highest biogas production was obtained with the addition of an EM4 decomposer, followed by manure, POME, WAS, and controls. The compost composition closer to SNI requirements was achieved by adding a manure decomposer that produced a C content of 24.63%, N 1.29 %, P 1.57%, K 0.18%, and C/N ratio 20.