Hydrolysis-acidogenesis of food waste in solid-liquid-separating continuous stirred tank reactor (SLS-CSTR) for volatile organic acid production

被引：53
|
作者：
Karthikeyan, Obulisamy Parthiba [1 ]
Selvam, Ammaiyappan [1 ]
Wong, Jonathan W. C. [1 ]
机构：
[1] Hong Kong Baptist Univ, Sinoforest Appl Res Ctr Pearl River Delta Environ, Kowloon, Hong Kong, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2016年 / 200卷
关键词：
Food waste; Hydrolysis-acidogenesis; CSTR; Solid- and hydraulic-retention time; Volatile fatty acids; SEMICONTINUOUS ANAEROBIC-DIGESTION; BIOGAS PRODUCTION; ACTIVATED-SLUDGE; MICROBIAL COMMUNITY; CO-DIGESTION; WATER; RECIRCULATION; FERMENTATION; PRETREATMENT; METHANE;
D O I：
10.1016/j.biortech.2015.10.017
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
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 degrees C; agitation-300 rpm; and organic loading rate (OLR)-2g VS L-1 day(-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 similar to 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. (C) 2015 Elsevier Ltd. All rights reserved.
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页码：366 / 373
页数：8
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