The best feed to water dilution ratio was 1:6 w/v, which gave the biogas yield of 382 mL/day. Excess water dilution discouraged bacterial cluster formation and hence decrease in biogas production.
The best biogas yields of 357, 279 159 mL/day were reported for pH 7, Ni2+ (100 ppm) and poultry droppings supplementation, respectively. None of the parameters tested affected the methane content of the biogas, although they improved the biogas yields.
Thus, the use of rice husks in biogas production is encouraged and can offer an alternative source of energy generation especially among the rural farmers and dwellers