TY - JOUR
T1 - Hydrolysis-acidogenesis of food waste in solid-liquid-separating continuous stirred tank reactor (SLS-CSTR) for volatile organic acid production
AU - Karthikeyan, Obulisamy Parthiba
AU - Selvam, Ammaiyappan
AU - Wong, Jonathan W.C.
N1 - Funding Information:
The authors would like to thank the Research Grant Council of the Hong Kong Special Administrative Region (Grant HKBU262013) for the financial support of this study.
Publisher copyright:
Copyright © 2015 Elsevier Ltd. All rights reserved.
PY - 2016/1
Y1 - 2016/1
N2 - The use of conventional continuous stirred tank reactor (CSTR) can affect the methane (CH4) recovery in a two-stage anaerobic digestion of food waste (FW) due to carbon short circuiting in the hydrolysis-acidogenesis (Hy-Aci) stage. In this research, we have designed and tested a solid-liquid-separating CSTR (SLS-CSTR) for effective Hy-Aci of FW. The working conditions were pH 6 and 9 (SLS-CSTR-1 and -2, respectively); temperature-37°C; agitation-300rpm; and organic loading rate (OLR)-2gVSL-1day-1. The volatile fatty acids (VFA), enzyme activities and bacterial population (by qPCR) were determined as test parameters. Results showed that the Hy-Aci of FW at pH 9 produced ~35% excess VFA as compared to that at pH 6, with acetic and butyric acids as major precursors, which correlated with the high enzyme activities and low lactic acid bacteria. The design provided efficient solid-liquid separation there by improved the organic acid yields from FW.
AB - The use of conventional continuous stirred tank reactor (CSTR) can affect the methane (CH4) recovery in a two-stage anaerobic digestion of food waste (FW) due to carbon short circuiting in the hydrolysis-acidogenesis (Hy-Aci) stage. In this research, we have designed and tested a solid-liquid-separating CSTR (SLS-CSTR) for effective Hy-Aci of FW. The working conditions were pH 6 and 9 (SLS-CSTR-1 and -2, respectively); temperature-37°C; agitation-300rpm; and organic loading rate (OLR)-2gVSL-1day-1. The volatile fatty acids (VFA), enzyme activities and bacterial population (by qPCR) were determined as test parameters. Results showed that the Hy-Aci of FW at pH 9 produced ~35% excess VFA as compared to that at pH 6, with acetic and butyric acids as major precursors, which correlated with the high enzyme activities and low lactic acid bacteria. The design provided efficient solid-liquid separation there by improved the organic acid yields from FW.
KW - CSTR
KW - Food waste
KW - Hydrolysis-acidogenesis
KW - Solid- and hydraulic-retention time
KW - Volatile fatty acids
UR - http://www.scopus.com/inward/record.url?scp=84945152386&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2015.10.017
DO - 10.1016/j.biortech.2015.10.017
M3 - Journal article
C2 - 26512860
AN - SCOPUS:84945152386
SN - 0960-8524
VL - 200
SP - 366
EP - 373
JO - Bioresource Technology
JF - Bioresource Technology
ER -