Three-stage anaerobic digester for food waste

Jingxin Zhang, Kai-Chee Loh, Wangliang Li, Jun Wei Lim, Yanjun Dai and Yen Wah Tong

Applied Energy, 2017, vol. 194, issue C, 287-295

Abstract: A novel compact three-stage anaerobic digester (TSAD) was developed for high-efficiency anaerobic digestion of food waste and methane production. Through structure optimization by having three separate chambers in a single-stage anaerobic digester, hydrolysis, acidogenesis and methanogenesis were independently optimized with concomitant improvement in anaerobic digestion performance. Compared to traditional one-stage and two-stage anaerobic digesters, TSAD had a 24–54% higher methane yield at a high organic loading rate of 10g VSFW/L. A higher volatile solid reduction rate of 83.5±1.3% was also achieved in TSAD. Even at high organic loading, TSAD still presented a high buffering ability when the one-stage and two-stage digesters had already soured and failed. Pyrosequencing analysis indicated that the bacterial community in TSAD is more diverse than the control digesters. Multi-function methanogens Methanosarcina and some dominant populations with the function of acetogenesis, amino-acid-utilization and symbiosis were found to selectively enrich in TSAD.

Keywords: Anaerobic; Three-stage anaerobic digestion; Food waste; Microbial community (search for similar items in EconPapers)
Date: 2017
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Citations: View citations in EconPapers (20)

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DOI: 10.1016/j.apenergy.2016.10.116

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