Comparing two enhancing methods for improving kitchen waste anaerobic digestion: bentonite addition and autoclaved de-oiling pretreatment

Duojiao Zhang, Na Duan*, Hailin Tian, Cong Lin, Yilin Zhang, Zhidan Liu

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The effects of different enhancement methods, including adding bentonite (1.25%, w/w, wet substrate) and autoclaved de-oiling pretreatment (121 °C, 30 minutes), on the anaerobic digestion of kitchen waste (KW) were comparably studied. Mesophilic continuous stirred tank reactors were used under different organic loading rates (OLRs) of 1.11 to 1.84 gVS (volatile solid)L−1d−1 and two different hydraulic retention times (HRTs) (20 d and 25 d). In this study, two enhancement methods and extending HRT could prevent volatile fatty acids (VFA) accumulation and obtain a high methane production at low OLR. Owing to the effect of providing nutrients and buffering capacity, the maximum methane yield was obtained with adding bentonite at OLR of 1.39 gVSL−1d−1. However, for high OLR (1.84 gVSL−1d−1), a decrease of the methane yield and system breakdown occurred due to the accumulation of VFAs. Engineering design and process evaluation of a CSTR biogas plant treating with KW based on the laboratory experiment was stated.
Original languageEnglish
JournalProcess Safety and Environmental Protection
Volume115
Pages (from-to)116-124
ISSN0957-5820
DOIs
Publication statusPublished - 2018

Keywords

  • Anaerobic digestion
  • Kitchen waste
  • Bentonite
  • Autoclaved de-oiling

Cite this

Zhang, Duojiao ; Duan, Na ; Tian, Hailin ; Lin, Cong ; Zhang, Yilin ; Liu, Zhidan. / Comparing two enhancing methods for improving kitchen waste anaerobic digestion: bentonite addition and autoclaved de-oiling pretreatment. In: Process Safety and Environmental Protection. 2018 ; Vol. 115. pp. 116-124.
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abstract = "The effects of different enhancement methods, including adding bentonite (1.25{\%}, w/w, wet substrate) and autoclaved de-oiling pretreatment (121 °C, 30 minutes), on the anaerobic digestion of kitchen waste (KW) were comparably studied. Mesophilic continuous stirred tank reactors were used under different organic loading rates (OLRs) of 1.11 to 1.84 gVS (volatile solid)L−1d−1 and two different hydraulic retention times (HRTs) (20 d and 25 d). In this study, two enhancement methods and extending HRT could prevent volatile fatty acids (VFA) accumulation and obtain a high methane production at low OLR. Owing to the effect of providing nutrients and buffering capacity, the maximum methane yield was obtained with adding bentonite at OLR of 1.39 gVSL−1d−1. However, for high OLR (1.84 gVSL−1d−1), a decrease of the methane yield and system breakdown occurred due to the accumulation of VFAs. Engineering design and process evaluation of a CSTR biogas plant treating with KW based on the laboratory experiment was stated.",
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author = "Duojiao Zhang and Na Duan and Hailin Tian and Cong Lin and Yilin Zhang and Zhidan Liu",
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Comparing two enhancing methods for improving kitchen waste anaerobic digestion: bentonite addition and autoclaved de-oiling pretreatment. / Zhang, Duojiao; Duan, Na; Tian, Hailin; Lin, Cong; Zhang, Yilin; Liu, Zhidan.

In: Process Safety and Environmental Protection, Vol. 115, 2018, p. 116-124.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Comparing two enhancing methods for improving kitchen waste anaerobic digestion: bentonite addition and autoclaved de-oiling pretreatment

AU - Zhang, Duojiao

AU - Duan, Na

AU - Tian, Hailin

AU - Lin, Cong

AU - Zhang, Yilin

AU - Liu, Zhidan

PY - 2018

Y1 - 2018

N2 - The effects of different enhancement methods, including adding bentonite (1.25%, w/w, wet substrate) and autoclaved de-oiling pretreatment (121 °C, 30 minutes), on the anaerobic digestion of kitchen waste (KW) were comparably studied. Mesophilic continuous stirred tank reactors were used under different organic loading rates (OLRs) of 1.11 to 1.84 gVS (volatile solid)L−1d−1 and two different hydraulic retention times (HRTs) (20 d and 25 d). In this study, two enhancement methods and extending HRT could prevent volatile fatty acids (VFA) accumulation and obtain a high methane production at low OLR. Owing to the effect of providing nutrients and buffering capacity, the maximum methane yield was obtained with adding bentonite at OLR of 1.39 gVSL−1d−1. However, for high OLR (1.84 gVSL−1d−1), a decrease of the methane yield and system breakdown occurred due to the accumulation of VFAs. Engineering design and process evaluation of a CSTR biogas plant treating with KW based on the laboratory experiment was stated.

AB - The effects of different enhancement methods, including adding bentonite (1.25%, w/w, wet substrate) and autoclaved de-oiling pretreatment (121 °C, 30 minutes), on the anaerobic digestion of kitchen waste (KW) were comparably studied. Mesophilic continuous stirred tank reactors were used under different organic loading rates (OLRs) of 1.11 to 1.84 gVS (volatile solid)L−1d−1 and two different hydraulic retention times (HRTs) (20 d and 25 d). In this study, two enhancement methods and extending HRT could prevent volatile fatty acids (VFA) accumulation and obtain a high methane production at low OLR. Owing to the effect of providing nutrients and buffering capacity, the maximum methane yield was obtained with adding bentonite at OLR of 1.39 gVSL−1d−1. However, for high OLR (1.84 gVSL−1d−1), a decrease of the methane yield and system breakdown occurred due to the accumulation of VFAs. Engineering design and process evaluation of a CSTR biogas plant treating with KW based on the laboratory experiment was stated.

KW - Anaerobic digestion

KW - Kitchen waste

KW - Bentonite

KW - Autoclaved de-oiling

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DO - 10.1016/j.psep.2017.09.011

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SN - 0957-5820

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