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

Obulisamy Parthiba Karthikeyan; Ammaiyappan Selvam; Jonathan W.C. Wong

doi:10.1016/j.biortech.2015.10.017

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

Obulisamy Parthiba Karthikeyan
, Ammaiyappan Selvam
, Jonathan W.C. Wong^*

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › peer-review

69 Citations (Scopus)

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-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.

Original language	English
Pages (from-to)	366-373
Number of pages	8
Journal	Bioresource Technology
Volume	200
Early online date	22 Oct 2015
DOIs	https://doi.org/10.1016/j.biortech.2015.10.017
Publication status	Published - Jan 2016

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This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

User-Defined Keywords

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

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10.1016/j.biortech.2015.10.017

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@article{5da3180246b649c59f6c28ab8dfca39c,

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-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 \textasciitilde{}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.",

keywords = "CSTR, Food waste, Hydrolysis-acidogenesis, Solid- and hydraulic-retention time, Volatile fatty acids",

author = "Karthikeyan, \{Obulisamy Parthiba\} and Ammaiyappan Selvam and Wong, \{Jonathan W.C.\}",

note = "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 {\textcopyright} 2015 Elsevier Ltd. All rights reserved.",

year = "2016",

month = jan,

doi = "10.1016/j.biortech.2015.10.017",

language = "English",

volume = "200",

pages = "366--373",

journal = "Bioresource Technology",

issn = "0960-8524",

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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 - https://www.scopus.com/pages/publications/84945152386

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DO - 10.1016/j.biortech.2015.10.017

M3 - Journal article

C2 - 26512860

AN - SCOPUS:84945152386

SN - 0960-8524

VL - 200

SP - 366

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JO - Bioresource Technology

JF - Bioresource Technology

ER -

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

Abstract

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