Generally the study shows that
biogas production increased from the begining of the
study and as the days increased, reached an optimum
value in a given time and decreased after optimum gas
production. From the gas production analysis, average
volume of biogas was maximum in Digester A (P = 75%,
C = 25%) producing 3.84 mL, followed by Digester B
(P = 50%, C = 50%) which produced total biogas of
3.54 mL and Digester C (P = 25%, C = 75%) producing
the least biogas of 3.19 mL. The higher volume gas
produced by Digester A may be due to higher nitrogen
content in poultry droppings as compared to other
feedstocks (Ojolo et al., 2007b). Also, the higher biogas
production from poultry droppings could also be
attributed to large amount of available nutrients presented
in the droppings.