From the graph 1, it is possible to see that the variables obtained were; time, temperature
and gas pressure (measured using a manometer). It was assumed that the measured
pressure was like biogas produced during waste digestion.
All the waste evaluated produced biogas after 24 hours; this was corresponding to
temperature increase. The better biogas producers were, cooked posho, sweet potato
peelings, Irish potato peelings, matooke peelings followed and cooked rice grains
performed poorly.
Cabbage leaves increased the pressure after 24 hours; the pressure was still high after 48
hours, Matooke peelings increased progressively in pressure after 2 days