Abstract
The aim of this study is to determine the best mix of water hyacinth (WH) to be co-digested with pig dung (PD) in order to maximize biogas production in terms of quantity. 11 mix ratios of WH to PD were evaluated and each experimental run was assessed over a period of 40 days. The data obtained were analyzed using regression analysis and non-linear parameter estimation model. From the results obtained, 3 WH: 7 PD co-digestion mix recorded the highest daily yield of 9.5 L of biogas on the 20th day, starting its gas production on the 3rd day and ending on the 34th day. The results also showed that WH single-substrate digestion produced a cumulative biogas volume of 32.18 L which corresponds to 5.14 L/kg of WH and PD single-substrate digestion produced a cumulative gas volume of 94.47 L corresponding to 15.1 L/kg of PD. 3 WH: 7 PD had the highest cumulative gas volume of 140 L which corresponds to 22.45 L/kg. Similarly, the highest maximum biogas production rate of 9.874057 L/day was observed for the 3 WH: 7 PD co-digestion mix and this was recorded on the 17th day of digestion. From the results obtained the best mix of the PD-aided WH digestion is 3 WH: 7 PD.Keywords— Biogas, Co-digestion, Cumulative, Pig Dung, Water Hyacinth
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