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A comparative study of biogas yield from mixed and mono-substrate agricultural wastes was carried out Thirteen (13) substrates as treatments A-M: 100% cowdung (A), com cob (B) aid poultry manure (C); 50/50 (w/w) of A+B (D), A+C (E), and B+C (F), 75/25 (w/w) of A+B (G), A+C (H), and B+C 0); 25/75 (w/w) of A+B (J); A+C (K), B+C (L) and 1:1:1 w/w mixtures of A+B+C treatment M were used. Slurries made by mixing 1 kg of each of these substrates with 3L of water (1:3 ration w/v) were loaded into a 13.6l locally fabricated digester. Three replicates per treatment of these batch-digestion systems were kept 8 week retention period. Initial weight of each digester and its content were taken. Parameters on mean volume of biogas produced, weight and temperature variations were determined weekly. Mean volume of biogas production and weight loss increased with digestion time and were significantly correlated except at the 7th and 8th weeks when there was a decreased in temperature. Treatments Hand B recorded the highest and lowest mean volume of biogas of 621.0ml/kg and 348.7ml/kg respectively at week 6. While single substrates (100% A, B and C) gave a mean cumulative volume of biogas of 1996.7 ml/kg, 2628.2ml/kg, 2238.8ml/kg, 2090.2ml/kg and 2200.7ml/kg were recorded for mixed substrates of 50/50%, 75/25%, 25/75% and 1:1:1 ratios respectively. At the same time the highest temperature of 44.1 ± 0.3 0 C was recorded. Analysis of variance (ANOVA) of the parameters were significantly different (P<0.05). This technology therefore provide a means of reducing ago waste biomass which could have constituted health hazard as well as environmental pollution.

Comparative Effect of Co-Digestion of Some Agricultural wastes on Biogas Yield and Some Physical Parameters