Evaluation of Biogas Production Yields of Different Waste Materials

Abstract

Biogas production from three different sources namely, cattle manure, cheese whey and blood, which have different characteristics, were investigated comparatively. Biogas production rates of 0.63, 0,72 and 0,64 l min-1 m-3 were obtained from the digestion of manure, co-digestion of manure-cheese whey and manure-blood, respectively, at 35±2 oC. Phosphorus () and volatile solid materials (VSM) are important for anaerobic bacteria as much as C:N ratio. A 54% of reduction in VSM and a 52 % reduction in were observed in 30 days of digestion of manure. The amount of total nitrogen (Tot-N) decreased 10% in 30 days of digestion but ammonium-nitrogen (Am-N) increased 46% at the same duration of time. Manure, during co-digestion, buffered and inoculated the cheese whey and blood, and converted them to the energy source. An average COD removal of 52% or 34% is also possible during co-digestion of cheese whey or blood with manure.