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Title: Three-stage anaerobic digester for food waste
Authors: Zhang, J 
Loh, KC 
Li, W 
Lim, JW 
Dai, Y
Tong, YW 
Issue Date: 15-May-2017
Publisher: Elsevier BV
Citation: Zhang, J, Loh, KC, Li, W, Lim, JW, Dai, Y, Tong, YW (2017-05-15). Three-stage anaerobic digester for food waste. Applied Energy 194 : 287-295. ScholarBank@NUS Repository.
Abstract: © 2016 Elsevier Ltd 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 10 g 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.
Source Title: Applied Energy
ISSN: 0306-2619
DOI: 10.1016/j.apenergy.2016.10.116
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