The study reports on the influence of nitrogen source on the biogas yield from cow (N'Dama) dung and rice husk.
The digester performance for both feedstocks were evaluated using standard parameters such as; initial PH, water dilution,
nitrogen source (guano and poultry droppings) and heavy metals. The source of innoculum used was cow rumen fluid. The result
show that for feedstock to water dilution ratio of 1:6 w/v and initial pH of 7.0, the maximum biogas yield for rice husk was 430
mL/day and 350 mL/day for cow dung. The heavy metals (Ni2+ and Zn2+) increased the biogas yield while Fe2+ (100 ppm) shows
no effect. Addition of guano results in maximum production rate of 85 mL/day and 60 mL/day in rice husk and cow dung
respectively. The use of guano indicates more biogas production rate in both feedstocks compared to poultry droppings.