Feeding approaches for biogas production from animal wastes and industrialeffluents

Different feeding approaches were applied to a 5 l anaerobic digester in or der to improve the biogas production. During operation, the reactor was fed with a mixture (9.7% w/v total solids (TS) and 7.6% w/v volatile solids (V S) in average) of pig manure with fish oil waste and waste from bentonite o f edible oil filtration process, at different intervals of 24, 12 and 4 h a t 15 days of hydraulic retention time. Production and quality of the biogas were practically constant at 183.7 ml (average) of biogas per gram of vola tile solids available in the reactor per day, and the best biogas compositi on was 73.6% v/v CH4 and 26.4% v/v CO2.