Abstract
The anaerobic co-digestion of Rice straw (RS) and Piggery dung (PD) at initial Total Solid (TS) loading of 10% was studied. This paper has investigated the effect of supplementing this co-digestion of RS and CD at with urea with an objective of reducing pH as well as improving biogas yield. These experiments were also carried out at different substrate mixing ratios of RS-CD 1:1 and RS-CD 1:2. The anaerobic digestion was carried out in a digester designed and fabricated locally with retention time of between 40 days and 60 days. Results show that addition of 1g of urea improved the maximum Biogas Yield of RS-PD 1:1 by 17.7% and RS-PD 1:2 by 23.4%. Further experiments with 0.5g, 1.5g and 2g of urea added to a co-digestion of RS-CD 1:1 produced a Cumulative Gas Yield of 75 L/Kg, 85.2 L/Kg and 76 L/Kg respectively. Experiments also showed that increasing urea concentration also leads to an increased methane content of the biogas produced.
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