POTENSI LIMBAH SAGU (Metroxylon sp.) DI KECAMATAN TEBING TINGGI BARAT KABUPATEN KEPULAUAN MERANTI SEBAGAI SUBSTRAT PENGHASIL BIOGAS

Abstract

Biogas is one of alternative energy sources that fulfills future fuel needs. This study aimed to analyse the potency of sago waste as fermentation substrate for biogas production. This research was done experimentally by employing sago waste materials obtained from Sago Factory Nambus River from District West Tebing Tinggi Sub- province Meranti and fresh cow rumen liquid was obtained from slaughterhouse in Pekanbaru. The biogas volume was calculated by measuring the volume of water that was pushed every 3 days, where the volume of water driven was proportional to the volume of biogas produced. The bacterial cell numbers was counted using plate count method employing Nutrient Agar (NA). The substrate fermentation temperature and pH were measured every 3 days. The highest biogas volume was produced by fermenter III (45760 ml) containing solid sago waste, liquid sago waste, and rumen liquid with ratio 1 : 1 : 1 and the lowest was produced by fermenter II (1600 ml). The total bacterial involved in biogas production ranges from 1,87x105– 2,87x108 CFU/ml samples. The temperature and pH of substrate fermetation was relatively constant during biogas production. The results showed that sago waste is potential as substrate for biogas production