Responses of microbial community and acidogenic intermediates to different water regimes in a hybrid solid anaerobic digestion system treating food waste

Xu, Suyun, Selvam, Ammaiyappan, Karthikeyan, Obuli. P., and Wong, Jonathan W.C. (2014) Responses of microbial community and acidogenic intermediates to different water regimes in a hybrid solid anaerobic digestion system treating food waste. Bioresource Technology, 168. pp. 49-58.

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Abstract

This study investigated the effects of different water regimes in an acidogenic leach bed reactor (LBR) during 16-day batch mode food waste digestion. LBRs were operated under five water replacement ratios (WRRs) (100%, 75%, 50%, 25% and 5% in LBRs R1, R2, R3, R4 and R5, respectively) and methanogenic effluent (ME) addition with two leachate recirculation frequencies (once in 24 h and 12 h in LBRs R6 and R7, respectively). Results showed that 50–100% WRRs accelerated the hydrolysis and acidogenesis with butyrate as the dominant product (∼35% of COD); whereas 5–25% WRRs promoted propionate production. The ME recirculation enhanced protein decomposition and reduced ethanol production. Lactobacillus dominated in LBRs with water addition (R1–R5), while Clostridium and hetero-fermenting lactic acid bacteria dominated in LBR with ME addition (R7). The highest volatile solid degradation (82.9%) and methane yield (0.29 L-CH4/g VS) were obtained with ME addition at 0.7 d hydraulic retention time.

Item ID: 34691
Item Type: Article (Research - C1)
ISSN: 1873-2976
Keywords: enzymatic activity; methanogenic effluent recirculation; microbial community; volatile fatty acids; water replacement
Date Deposited: 10 Oct 2014 02:23
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050206 Environmental Monitoring @ 40%
06 BIOLOGICAL SCIENCES > 0605 Microbiology > 060503 Microbial Genetics @ 40%
10 TECHNOLOGY > 1003 Industrial Biotechnology > 100305 Industrial Microbiology (incl Biofeedstocks) @ 20%
SEO Codes: 85 ENERGY > 8505 Renewable Energy > 850501 Biofuel (Biomass) Energy @ 100%
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