Optimization of water replacement during leachate recirculation for two-phase food waste anaerobic digestion system with off-gas diversion

Liwen Luo; Guneet Kaur; Jun Zhao; Jun Zhou; Suyun Xu; Sunita Varjani; Jonathan W. C. Wong

doi:10.1016/j.biortech.2021.125234

Optimization of water replacement during leachate recirculation for two-phase food waste anaerobic digestion system with off-gas diversion

Liwen Luo, Guneet Kaur, Jun Zhao, Jun Zhou, Suyun Xu, Sunita Varjani, Jonathan W. C. Wong^*

^*Corresponding author for this work

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

30 Citations (Scopus)

Abstract

An integrated two-phase AD with acidogenic off-gas diversion from a leach bed reactor to an upflow anaerobic sludge blanket was developed for improving methane production. However, this system had its own technical limitation such as mass transfer efficiency for solid-state treatment. In order to optimize the mass transfer in this two phase AD system, leachate recirculation with various water replacement rates regulating the total solids contents (TS) at 12.5%, 15%, and 17.5% was aim to investigate its effect on methane generation. The solubilization of food waste was increased with decreasing TS content, while the enzymatic hydrolysis showed the opposite trend. A TS contents of 15% presented the best acidogenic performance with the highest hydrogen yield of 30.3 L H₂/kg VS_added, which subsequently resulted in the highest methane production. The present study provides an easy approach to enhance food waste degradation in acidogenic phase and energy conversion in methanogenic phase simultaneously.

Original language	English
Article number	125234
Number of pages	8
Journal	Bioresource Technology
Volume	335
DOIs	https://doi.org/10.1016/j.biortech.2021.125234
Publication status	Published - Sept 2021

User-Defined Keywords

Food waste
Hydrogen
Leach bed reactor
Methane
Solids content

UN SDGs

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

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10.1016/j.biortech.2021.125234

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title = "Optimization of water replacement during leachate recirculation for two-phase food waste anaerobic digestion system with off-gas diversion",

abstract = "An integrated two-phase AD with acidogenic off-gas diversion from a leach bed reactor to an upflow anaerobic sludge blanket was developed for improving methane production. However, this system had its own technical limitation such as mass transfer efficiency for solid-state treatment. In order to optimize the mass transfer in this two phase AD system, leachate recirculation with various water replacement rates regulating the total solids contents (TS) at 12.5%, 15%, and 17.5% was aim to investigate its effect on methane generation. The solubilization of food waste was increased with decreasing TS content, while the enzymatic hydrolysis showed the opposite trend. A TS contents of 15% presented the best acidogenic performance with the highest hydrogen yield of 30.3 L H2/kg VSadded, which subsequently resulted in the highest methane production. The present study provides an easy approach to enhance food waste degradation in acidogenic phase and energy conversion in methanogenic phase simultaneously.",

keywords = "Food waste, Hydrogen, Leach bed reactor, Methane, Solids content",

author = "Liwen Luo and Guneet Kaur and Jun Zhao and Jun Zhou and Suyun Xu and Sunita Varjani and Wong, {Jonathan W. C.}",

note = "Funding Information: The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (No. 51978595). Publisher Copyright: {\textcopyright} 2021 Published by Elsevier Ltd.",

year = "2021",

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doi = "10.1016/j.biortech.2021.125234",

language = "English",

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T1 - Optimization of water replacement during leachate recirculation for two-phase food waste anaerobic digestion system with off-gas diversion

AU - Luo, Liwen

AU - Kaur, Guneet

AU - Zhao, Jun

AU - Zhou, Jun

AU - Xu, Suyun

AU - Varjani, Sunita

AU - Wong, Jonathan W. C.

N1 - Funding Information: The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (No. 51978595). Publisher Copyright: © 2021 Published by Elsevier Ltd.

PY - 2021/9

Y1 - 2021/9

N2 - An integrated two-phase AD with acidogenic off-gas diversion from a leach bed reactor to an upflow anaerobic sludge blanket was developed for improving methane production. However, this system had its own technical limitation such as mass transfer efficiency for solid-state treatment. In order to optimize the mass transfer in this two phase AD system, leachate recirculation with various water replacement rates regulating the total solids contents (TS) at 12.5%, 15%, and 17.5% was aim to investigate its effect on methane generation. The solubilization of food waste was increased with decreasing TS content, while the enzymatic hydrolysis showed the opposite trend. A TS contents of 15% presented the best acidogenic performance with the highest hydrogen yield of 30.3 L H2/kg VSadded, which subsequently resulted in the highest methane production. The present study provides an easy approach to enhance food waste degradation in acidogenic phase and energy conversion in methanogenic phase simultaneously.

AB - An integrated two-phase AD with acidogenic off-gas diversion from a leach bed reactor to an upflow anaerobic sludge blanket was developed for improving methane production. However, this system had its own technical limitation such as mass transfer efficiency for solid-state treatment. In order to optimize the mass transfer in this two phase AD system, leachate recirculation with various water replacement rates regulating the total solids contents (TS) at 12.5%, 15%, and 17.5% was aim to investigate its effect on methane generation. The solubilization of food waste was increased with decreasing TS content, while the enzymatic hydrolysis showed the opposite trend. A TS contents of 15% presented the best acidogenic performance with the highest hydrogen yield of 30.3 L H2/kg VSadded, which subsequently resulted in the highest methane production. The present study provides an easy approach to enhance food waste degradation in acidogenic phase and energy conversion in methanogenic phase simultaneously.

KW - Food waste

KW - Hydrogen

KW - Leach bed reactor

KW - Methane

KW - Solids content

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DO - 10.1016/j.biortech.2021.125234

M3 - Journal article

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AN - SCOPUS:85105585068

SN - 0960-8524

VL - 335

JO - Bioresource Technology

JF - Bioresource Technology

M1 - 125234

ER -

Optimization of water replacement during leachate recirculation for two-phase food waste anaerobic digestion system with off-gas diversion

Abstract

User-Defined Keywords

UN SDGs

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