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Laboratory-scale digesters were constructed to investigate the effect of digester shape (horizontal and vertical) and substrate type, cattle dung (CD), chicken manure (CM) as mono-digestion and a mixture of them (50% CD+ 50% CM, w/w) as co-digestion on quantity and quality of biogas produced. The experimental work was carried out at 20±3 oC (winter season), 29±3 oC (summer season) and 38±1 oC (heating treatment) through digestion period of 60 days. The results showed that, the highest value methane 68.1% (by volume) was obtained from the vertical digester of fed with CD+CM at summer temperature. On the contrary, the lowest value of methane 42.0% was obtained in the horizontal digesters fed with CM alone under heating temperature. The highest value of specific methane production rate of 238 L kg-1VS added per day was obtained from the horizontal digesters fed with CD+CM at summer temperature, while the lowest rate of  32 L kg-1VS added per day was observed in the horizontal digesters fed with CM alone under heating temperature.

METHANE PRODUCTION BY ANAEROBIC DIGESTION FROM CATTLE DUNG AND CHICKEN MANURE UNDER LABORATORY CONDITIONS