The volumes of gas collected before and after scrubbing were
taken and recorded following the method described in the succeeding
section. The gases collected before and after scrubbing
were used to boil water using Ahmadu Bello University biogas
stove burner (Igboro et al., 2011) to estimate and compare the
cooking rates. A solid retention time (SRT) of 30 days was chosen
for the substrates after a previous study (Gelegenis et al., 2007).
During this period, daily ambient temperature of Samaru-Zaria
varied from 27 C to 37 C which is within the mesophilic temperature
range (Bolzonella et al., 2012).