The results are presented in Figure 7. The cowdung feedstock was found to produce biogas from the fourth day
rising to a high on the eigth day which remained almost constant reaching a maxima between the 28 - 36th day.
The biogas production from the water hyacith/cowdung mixture showed a different trend; biogas production
remained low than that from cowdung between the fourth and the18th day but rose steadly to reach a maxima at
the 32nd day and remained constant up to the 36th day. The trends show a rather similar trend bu the delay during
the first few days for water hyacinth/cow dung mixture can be attributed to the low bacteria population in the
matrix. The study shows a greter yield of biogas from the hyacinth/cow dung mixture compared to cow dung.
The results of the study agree with those reported by other researchers using water hyacinth as a feed stock