Abstract
The characteristics of Palm Oil Mill effluent (POME) have captivated attention in harnessing its high organic contents to generate biogas via anaerobic digestion. However, biogas production is unstable during low crop season. Therefore, this research focuses on improving the biogas generation by adopting the co-digestion method which treats POME and Decanter cake (DC) simultaneously. Results show that DC:POME ratio of 0.8:1 (in term of volatile solids (VS)) with organic loading of 11 g VS/L and HRT of 28 days generated the highest methane yield of 0.515 L CH4/g VS, which is a 186% improvement as compared to mono-digestion of POME. The co-digestion of substrates has shown good biodegradability of organic contents where up to 99.42% chemical oxygen demand (COD) and VS removal efficiencies were attained. Logistic Function Model (LFM) is the most suitable model to predict the performance of co-digestion with the highest R2 of 0.9810.
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