“…The biogas produced was measured using water displacement method for every 5 days. It was found that piggery faeces gave the highest yield of biogas (1.07 l kg -1 ), followed by cattle dung (0.71 l kg -1 ), with poultry wastes the least (0.42 l kg -1 ) all under direct sunlight (Soom et al, 2016). Microbial biomass in terms of dehydrogenase and cellulase activity was also determined at 15 days interval for eight weeks during batch digestion.…”