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Hydrochar-Facilitated Anaerobic Digestion: Evidence for Direct Interspecies Electron Transfer Mediated through Surface Oxygen-Containing Functional Groups.

Identifieur interne : 000345 ( Main/Exploration ); précédent : 000344; suivant : 000346

Hydrochar-Facilitated Anaerobic Digestion: Evidence for Direct Interspecies Electron Transfer Mediated through Surface Oxygen-Containing Functional Groups.

Auteurs : Shuang Ren [République populaire de Chine] ; Muhammad Usman [République populaire de Chine] ; Daniel C W. Tsang [République populaire de Chine] ; Sompong O-Thong [République populaire de Chine, Thaïlande] ; Irini Angelidaki [Danemark] ; Xiangdong Zhu [République populaire de Chine] ; Shicheng Zhang [République populaire de Chine] ; Gang Luo [République populaire de Chine]

Source :

RBID : pubmed:32259430

Descripteurs français

English descriptors

Abstract

Acceleration of the anaerobic digestion (AD) process is crucial to achieving energy-efficient recycling of organic wastes. Hydrochar is produced by hydrothermal liquefaction of biomass, yet its application in the AD process is rarely reported. The present study showed that sewage sludge-derived hydrochar (SH) enhanced the methane production rate of glucose by 37%. SH increased the methane production rate from acetate but did not affect acidification and the methane production rate from H2/CO2. SH enhanced hydrogenotrophic methanogenesis, which could be due to direct interspecies electron transfer (DIET) by converting H+, e-, and CO2 to methane. Trichococcus and Methanosaeta were dominant in the AD process with SH. Label-free proteomic analysis showed Methanosaeta was involved in DIET as reflected by the up-regulation of proteins involved in hydrogenotrophic methanogenesis. Hydrochars derived from corn straw (CH), Enteromorpha algae (EH), and poplar wood (PH), as well as activated carbon (AC), were also tested in the AD process. SH, CH, and EH obviously increased the methane production rates, which were 39%, 15%, and 20% higher than the control experiment, respectively. It was neither electrical conductivity nor the total redox property of hydrochars and AC but the abundances of surface oxygen-containing functional groups that correlated to the methane production rates.

DOI: 10.1021/acs.est.0c00112
PubMed: 32259430


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<div type="abstract" xml:lang="en">Acceleration of the anaerobic digestion (AD) process is crucial to achieving energy-efficient recycling of organic wastes. Hydrochar is produced by hydrothermal liquefaction of biomass, yet its application in the AD process is rarely reported. The present study showed that sewage sludge-derived hydrochar (SH) enhanced the methane production rate of glucose by 37%. SH increased the methane production rate from acetate but did not affect acidification and the methane production rate from H
<sub>2</sub>
/CO
<sub>2</sub>
. SH enhanced hydrogenotrophic methanogenesis, which could be due to direct interspecies electron transfer (DIET) by converting H
<sup>+</sup>
, e
<sup>-</sup>
, and CO
<sub>2</sub>
to methane.
<i>Trichococcus</i>
and
<i>Methanosaeta</i>
were dominant in the AD process with SH. Label-free proteomic analysis showed
<i>Methanosaeta</i>
was involved in DIET as reflected by the up-regulation of proteins involved in hydrogenotrophic methanogenesis. Hydrochars derived from corn straw (CH),
<i>Enteromorpha</i>
algae (EH), and poplar wood (PH), as well as activated carbon (AC), were also tested in the AD process. SH, CH, and EH obviously increased the methane production rates, which were 39%, 15%, and 20% higher than the control experiment, respectively. It was neither electrical conductivity nor the total redox property of hydrochars and AC but the abundances of surface oxygen-containing functional groups that correlated to the methane production rates.</div>
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<AbstractText>Acceleration of the anaerobic digestion (AD) process is crucial to achieving energy-efficient recycling of organic wastes. Hydrochar is produced by hydrothermal liquefaction of biomass, yet its application in the AD process is rarely reported. The present study showed that sewage sludge-derived hydrochar (SH) enhanced the methane production rate of glucose by 37%. SH increased the methane production rate from acetate but did not affect acidification and the methane production rate from H
<sub>2</sub>
/CO
<sub>2</sub>
. SH enhanced hydrogenotrophic methanogenesis, which could be due to direct interspecies electron transfer (DIET) by converting H
<sup>+</sup>
, e
<sup>-</sup>
, and CO
<sub>2</sub>
to methane.
<i>Trichococcus</i>
and
<i>Methanosaeta</i>
were dominant in the AD process with SH. Label-free proteomic analysis showed
<i>Methanosaeta</i>
was involved in DIET as reflected by the up-regulation of proteins involved in hydrogenotrophic methanogenesis. Hydrochars derived from corn straw (CH),
<i>Enteromorpha</i>
algae (EH), and poplar wood (PH), as well as activated carbon (AC), were also tested in the AD process. SH, CH, and EH obviously increased the methane production rates, which were 39%, 15%, and 20% higher than the control experiment, respectively. It was neither electrical conductivity nor the total redox property of hydrochars and AC but the abundances of surface oxygen-containing functional groups that correlated to the methane production rates.</AbstractText>
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