Document Type

Journal Article

Department/Unit

Department of Biology

Title

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

Abstract

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-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 ∼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.

Publication Year

2016

Journal Title

Bioresource Technology

Volume number

200

Publisher

Elsevier

First Page (page number)

366

Last Page (page number)

373

Referreed

1

DOI

10.1016/j.biortech.2015.10.017

ISSN (print)

9608524

Keywords

Food waste, Hydrolysis–acidogenesis, CSTR, Solid- and hydraulic-retention time, Volatile fatty acids

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