| Summary: | Laboratory-scale digesters were operated to study the effect of leachate chemical oxygen demand strength on biogas (methane) production. Three sets of experiment were performed using municipal solid waste leachate slurry with two different chemical oxygen demand strength strengths namely 3000 and 21000 mg/L (referred as low and high strength, respectively). The experiments were conducted at a controlled temperature of 35°C and pH ranging from 6.8 to 7.3 over 20 days period. The process performance was evaluated based on the biogas production and pollutants removal efficiencies. Results showed that the high and low strength samples performed quite similarly but with different biogas production rate observed. The biochemical oxygen demand in the effluent removed up to 80%, but the performance of other parameters such as chemical oxygen demand, total suspended solid and volatile suspended solid was slightly decreased which contributes 33 to 46%, 21 to 37% and 20 to 35%, respectively. From this study, it can be concluded that this method not only contributed to renewable biogas production but also improved the effluent quality.
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