The effect of mixing ratio of cattle and piggery dung on biogas generation was investigated. Fifteen anaerobic batch digesters were constructed and used for the experiment. Three replicates of 10% total solids each dung and their mixtures in the ratios of 1:0; 1:1, 3:2; 4:1 and 0:1 were anaerobically digested for a 40-day detention period. Gas yield was measured by the method of water displacement. Ambient temperature was measured by a maximum and minimum thermometer. Anaerobic digestion of the slurries was undertaken in the mesophilic temperature range (20-40 ℃). Carbon was determined using the walkley-Black method and nitrogen by the macro-Kjiedhal method. The pH was measured every 5 days during the period of digestion using a digital pH meter. The result obtained showed mean biogas yield in the order of mixture ratio of 4:1 of cattle and piggery dung > cattle > mixture ratio of 3:2 of cattle and piggery dung > piggery dung > mixture ratio of 1:1 of cattle and piggery dung.
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