alone was 2.29 ± 0.97 L/total mass of slurry. When blended with CD, PD and SD, mean flammable biogas
yield was increased to 4.88 ± 1.73, 5.55 ± 2.17 and 5.65 ±2.62 L/total mass of slurry respectively. The main disadvantage of poultry manure is that it produces a proportion of hydrogen sulphide, which even when present in only small proportions, corrodes metal fittings (Ojolo et al., 2007a). It is also poisonous, but not in the quantities produced (less than 0.075 mL), so it’s not enough to be a hazard. When it burns in air it oxidises to sulphur-dioxide. Cow dung produces almost no hydrogen-sulphide but needs larger quantities than poultry to produce the same amount of gas. Finally, the study shows that abundant animal wastes generated in Nigeria can be converted to
useful products (methane and digestate) using anaerobic digestion.