How exothermic characteristics of rice straw during anaerobic digestion affects net energy production

Tao Luo; Benyamin Khoshnevisan; Junting Pan; Yihong Ge; Zili Mei; Jian Xue; Yanran Fu; Hongbin Liu

doi:10.1016/j.energy.2020.118772

How exothermic characteristics of rice straw during anaerobic digestion affects net energy production

Tao Luo, Benyamin Khoshnevisan, Junting Pan^*, Yihong Ge, Zili Mei, Jian Xue, Yanran Fu, Hongbin Liu

^*Corresponding author for this work

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

Abstract

The self-heating of lignocellulosic biomass, when degraded under anaerobic conditions, has been reportedly observed. Such a phenomenon would cause substrate to show exothermic characteristics which are in contrast to the current thermodynamic or microbiological knowledge. Rice straw (RS), when undergone anaerobic digestion, is prone to self-heating which can increase the reactor temperature according to heat-releasing characteristics, thus improve the net energy production. In the present study, the relationship of biogas production and self-heating release as well as the synergistic effects of two energy production pathways was investigated. Moreover, the optimal process for maximizing the biogas production under self-heating phenomenon was scrutinized. Compared to control assays, a 0.48 °C increase in average temperature was noticed among experimental trials due to RS self-heating phenomenon. The results showed that the self-heating was even improved simultaneous with increased methane production rate. Hydrolysis rate and total solid content were found to be possible promising options to control the self-heating release.

Original language	English
Article number	118772
Journal	Energy
Volume	212
ISSN	0360-5442
DOIs	https://doi.org/10.1016/j.energy.2020.118772
Publication status	Published - 1. Dec 2020
Externally published	Yes

Bibliographical note

Funding Information:
The authors gratefully acknowledge financial support from Fundamental Research Funds for Central Non-profit Scientific Institution (No. G202002-33 ), Open Fund of Key Laboratory of Development and Application of Rural Renewable Energy , Ministry of Agriculture and Rural Affairs, China (No. 2019013 ), Special Fund for Agro-scientific Research in the Public Interest from the Ministry of Agriculture, China (No. 201303089 ), Comprehensive Construction Project on Rural Energy of Ministry of Agriculture and Rural Affairs (No. 2013012619016 ), Comprehensive methods of agricultural non-point source pollution control in typical watershed (No. 13200276 , 13200275 ), the International Clean Energy Talent Program of China Scholarship Council (No. 201802180094 ) and the Agricultural Science and Technology Innovation Program (ASTIP) of the Chinese Academy of Agricultural Sciences.

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

Anaerobic digestion
Hydrolysis rate
Self-heating
Straw

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10.1016/j.energy.2020.118772

Cite this

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title = "How exothermic characteristics of rice straw during anaerobic digestion affects net energy production",

abstract = "The self-heating of lignocellulosic biomass, when degraded under anaerobic conditions, has been reportedly observed. Such a phenomenon would cause substrate to show exothermic characteristics which are in contrast to the current thermodynamic or microbiological knowledge. Rice straw (RS), when undergone anaerobic digestion, is prone to self-heating which can increase the reactor temperature according to heat-releasing characteristics, thus improve the net energy production. In the present study, the relationship of biogas production and self-heating release as well as the synergistic effects of two energy production pathways was investigated. Moreover, the optimal process for maximizing the biogas production under self-heating phenomenon was scrutinized. Compared to control assays, a 0.48 °C increase in average temperature was noticed among experimental trials due to RS self-heating phenomenon. The results showed that the self-heating was even improved simultaneous with increased methane production rate. Hydrolysis rate and total solid content were found to be possible promising options to control the self-heating release.",

keywords = "Anaerobic digestion, Hydrolysis rate, Self-heating, Straw",

author = "Tao Luo and Benyamin Khoshnevisan and Junting Pan and Yihong Ge and Zili Mei and Jian Xue and Yanran Fu and Hongbin Liu",

note = "Funding Information: The authors gratefully acknowledge financial support from Fundamental Research Funds for Central Non-profit Scientific Institution (No. G202002-33 ), Open Fund of Key Laboratory of Development and Application of Rural Renewable Energy , Ministry of Agriculture and Rural Affairs, China (No. 2019013 ), Special Fund for Agro-scientific Research in the Public Interest from the Ministry of Agriculture, China (No. 201303089 ), Comprehensive Construction Project on Rural Energy of Ministry of Agriculture and Rural Affairs (No. 2013012619016 ), Comprehensive methods of agricultural non-point source pollution control in typical watershed (No. 13200276 , 13200275 ), the International Clean Energy Talent Program of China Scholarship Council (No. 201802180094 ) and the Agricultural Science and Technology Innovation Program (ASTIP) of the Chinese Academy of Agricultural Sciences. Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",

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language = "English",

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T1 - How exothermic characteristics of rice straw during anaerobic digestion affects net energy production

AU - Luo, Tao

AU - Khoshnevisan, Benyamin

AU - Pan, Junting

AU - Ge, Yihong

AU - Mei, Zili

AU - Xue, Jian

AU - Fu, Yanran

AU - Liu, Hongbin

N1 - Funding Information: The authors gratefully acknowledge financial support from Fundamental Research Funds for Central Non-profit Scientific Institution (No. G202002-33 ), Open Fund of Key Laboratory of Development and Application of Rural Renewable Energy , Ministry of Agriculture and Rural Affairs, China (No. 2019013 ), Special Fund for Agro-scientific Research in the Public Interest from the Ministry of Agriculture, China (No. 201303089 ), Comprehensive Construction Project on Rural Energy of Ministry of Agriculture and Rural Affairs (No. 2013012619016 ), Comprehensive methods of agricultural non-point source pollution control in typical watershed (No. 13200276 , 13200275 ), the International Clean Energy Talent Program of China Scholarship Council (No. 201802180094 ) and the Agricultural Science and Technology Innovation Program (ASTIP) of the Chinese Academy of Agricultural Sciences. Publisher Copyright: © 2020 Elsevier Ltd

PY - 2020/12/1

Y1 - 2020/12/1

N2 - The self-heating of lignocellulosic biomass, when degraded under anaerobic conditions, has been reportedly observed. Such a phenomenon would cause substrate to show exothermic characteristics which are in contrast to the current thermodynamic or microbiological knowledge. Rice straw (RS), when undergone anaerobic digestion, is prone to self-heating which can increase the reactor temperature according to heat-releasing characteristics, thus improve the net energy production. In the present study, the relationship of biogas production and self-heating release as well as the synergistic effects of two energy production pathways was investigated. Moreover, the optimal process for maximizing the biogas production under self-heating phenomenon was scrutinized. Compared to control assays, a 0.48 °C increase in average temperature was noticed among experimental trials due to RS self-heating phenomenon. The results showed that the self-heating was even improved simultaneous with increased methane production rate. Hydrolysis rate and total solid content were found to be possible promising options to control the self-heating release.

AB - The self-heating of lignocellulosic biomass, when degraded under anaerobic conditions, has been reportedly observed. Such a phenomenon would cause substrate to show exothermic characteristics which are in contrast to the current thermodynamic or microbiological knowledge. Rice straw (RS), when undergone anaerobic digestion, is prone to self-heating which can increase the reactor temperature according to heat-releasing characteristics, thus improve the net energy production. In the present study, the relationship of biogas production and self-heating release as well as the synergistic effects of two energy production pathways was investigated. Moreover, the optimal process for maximizing the biogas production under self-heating phenomenon was scrutinized. Compared to control assays, a 0.48 °C increase in average temperature was noticed among experimental trials due to RS self-heating phenomenon. The results showed that the self-heating was even improved simultaneous with increased methane production rate. Hydrolysis rate and total solid content were found to be possible promising options to control the self-heating release.

KW - Anaerobic digestion

KW - Hydrolysis rate

KW - Self-heating

KW - Straw

U2 - 10.1016/j.energy.2020.118772

DO - 10.1016/j.energy.2020.118772

M3 - Journal article

AN - SCOPUS:85090553887

SN - 0360-5442

VL - 212

JO - Energy

JF - Energy

M1 - 118772

ER -

How exothermic characteristics of rice straw during anaerobic digestion affects net energy production

Abstract

Bibliographical note

Keywords

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