Enhancement of biogas production in anaerobic co-digestion of food waste and waste activated sludge by biological co-pretreatment

Jingxin Zhang, Wangliang Li, Jonathan Lee, Kai-Chee Loh, Yanjun Dai and Yen Wah Tong

Energy, 2017, vol. 137, issue C, 479-486

Abstract: The effects of biological co-pretreatment on biogas production from anaerobic co-digestion of food waste (FW) and waste activated sludge (WAS) were investigated. FW and WAS underwent anaerobic co-pretreatment to improve hydrolysis efficiency followed by co-digestion. Results showed that the methane yield from co-digestion of co-pretreated FW and WAS was 24.6% higher than that of control substrates without pretreatment. An increase of 10.1% in solids reduction was achieved in the anaerobic digester under the optimum pretreatment time of 24 h. Compared to mono-digestion of FW with pretreatment, the combination of anaerobic co-digestion and co-pretreatment of FW and WAS resulted in a higher treatment performance and methane production due to synergistic effects of pH amendment and enhancement of WAS particles solubilization. Pyrosequencing analysis indicated that anaerobic co-pretreatment reduced the abundance of filamentous bacteria of genus Levilinea in the subsequent co-digestion, which was liable to cause a decrease in anaerobic digestion performance.

Keywords: Anaerobic digestion; Biological co-pretreatment; Waste activated sludge; Food waste; Microbial community (search for similar items in EconPapers)
Date: 2017
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Citations: View citations in EconPapers (21)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:137:y:2017:i:c:p:479-486

DOI: 10.1016/j.energy.2017.02.163

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