TY - JOUR
T1 - Responses of microbial community and acidogenic intermediates to different water regimes in a hybrid solid anaerobic digestion system treating food waste
AU - Xu, Suyun
AU - Selvam, Ammaiyappan
AU - Karthikeyan, Obuli P.
AU - WONG, Jonathan W C
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2014/9
Y1 - 2014/9
N2 - 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 24h and 12h 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 (0.29L-CH4/g VS) were obtained with ME addition at 0.7d hydraulic retention time.
AB - 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 24h and 12h 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 (0.29L-CH4/g VS) were obtained with ME addition at 0.7d hydraulic retention time.
KW - Enzymatic activity
KW - Methanogenic effluent recirculation
KW - Microbial community
KW - Volatile fatty acids
KW - Water replacement
UR - http://www.scopus.com/inward/record.url?scp=84905030699&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2014.04.090
DO - 10.1016/j.biortech.2014.04.090
M3 - Journal article
C2 - 24923660
AN - SCOPUS:84905030699
SN - 0960-8524
VL - 168
SP - 49
EP - 58
JO - Bioresource Technology
JF - Bioresource Technology
ER -
