respectively. The digesters, water tanks and water
collectors were inter-connected using rubber hoses
with cork fitted tightly to prevent gas and water
leakage. Each mixture was diluted to 8% TS, as
recommended by Zennaki et al. (1996), agitated
vigorously and screened using a 6 mm plastic
mesh to remove gross solids. The digesters were
loaded once during the experiment to 70% of the
capacity with the substrates. The daily biogas
production was measured by water displacement
method. Each treatment was replicated thrice. The
digesters were manually agitated once daily to
ensure intimate contact between micro-organisms
and the substrates. The substrates were digested
for 63 days during which ambient and substrates
temperatures and biogas production were
measured daily, while pH was measured
fortnightly.
Diges