Abstract
Abstract Acidogenic (ACIDO-DR) and methanogenic (METHA-DR) digesters were synchronously operated under the semi-continuous modes of mono-digestion (control) and co-digestion (mixture). The CH4 gas production rate was enhanced by 19.8% in co-digestion at an optimum ratio of 7:3 (food waste to sewage sludge). At this ratio, the maximum BMP of 620 ± 18 mL CH4 g−1 VS was attained in co-digestion but control showed lower BMP of 440 ± 14 mL CH4 g−1 VS. Co-digestion of food waste and sewage sludge was enhanced due to the adequate adjustment of C/N ratio for feed waste, improved buffer capacity and the necessary amounts of trace elements. Additionally, this system provided better buffering potential to high OLR than the one-phased system. As a result, the two-phased anaerobic co-digestion system suggested the alternatives for many struggling wastewater treatment plants, without any major remodeling of facilities, to enhance sustainable energy production that could be beneficial to public use.
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