The internal driving mechanism of microbial community and metabolic pathway for psychrophilic anaerobic digestion by microbial electrolysis cell
The internal driving mechanism of microbial community and metabolic pathway for psychrophilic anaerobic digestion by microbial electrolysis cell
The system that microbial electrolysis cell coupled anaerobic digestion (termed MEC-AD) with metal organic framework-modified cathode was operated under different voltage levels (0–1.2 V) at 20 °C. The maximum methane yield increased to 0.23 ± 0.01 LCH4 g-1COD at 0.9 V, with 28% improvement compared to 0 V (0.18 ± 0.01 LCH4 g-1COD). Moreover, total volatile fatty acid and propionate accumulation decreased by 32% and 15% at 0.9 V, indicating the system has potential to alleviate acidity suppression. Acidogens and electroactive microorganisms was clearly enriched with increasing applied voltage. Specifically, the abundance of Smithella increased, which could degrade propionate to acetate. Methanosaeta was dominant, accounting for ca. 40.1%∼55.1% of the archaea community at 0.3–1.2 V. Furthermore, the system reinforced psychrophilic methanogenesis by activating important enzymes involved in related metabolism pathways. Overall, this study provides perspective on the future practical application for the regulation of psychrophilic AD in electrochemically integrated bioreactors.
Bioelectrochemical system, Cathode material, Low temperature, Metabolic pathway, Methane production
Zheng, Xiaomei
3b2a979c-abdb-4b6f-a992-55b94d30d0e2
Xu, Jun
3e689a3f-7ad6-49a5-bab5-1604a85bf9b0
Lin, Rujing
7150f439-5df4-4399-8ad3-293489925133
He, Yingying
759dd742-0b40-45ab-b585-23dfb5d37b0d
Yu, Yaqing
26b74599-a8af-4478-8d52-386646950823
Zhang, Yue
69b11d32-d555-46e4-a333-88eee4628ae7
Xie, Li
6bcf2c6d-63c3-4e95-8d7b-2ce052a44b06
26 February 2023
Zheng, Xiaomei
3b2a979c-abdb-4b6f-a992-55b94d30d0e2
Xu, Jun
3e689a3f-7ad6-49a5-bab5-1604a85bf9b0
Lin, Rujing
7150f439-5df4-4399-8ad3-293489925133
He, Yingying
759dd742-0b40-45ab-b585-23dfb5d37b0d
Yu, Yaqing
26b74599-a8af-4478-8d52-386646950823
Zhang, Yue
69b11d32-d555-46e4-a333-88eee4628ae7
Xie, Li
6bcf2c6d-63c3-4e95-8d7b-2ce052a44b06
Zheng, Xiaomei, Xu, Jun, Lin, Rujing, He, Yingying, Yu, Yaqing, Zhang, Yue and Xie, Li
(2023)
The internal driving mechanism of microbial community and metabolic pathway for psychrophilic anaerobic digestion by microbial electrolysis cell.
Bioresource Technology, 374, [128764].
(doi:10.1016/j.biortech.2023.128764).
Abstract
The system that microbial electrolysis cell coupled anaerobic digestion (termed MEC-AD) with metal organic framework-modified cathode was operated under different voltage levels (0–1.2 V) at 20 °C. The maximum methane yield increased to 0.23 ± 0.01 LCH4 g-1COD at 0.9 V, with 28% improvement compared to 0 V (0.18 ± 0.01 LCH4 g-1COD). Moreover, total volatile fatty acid and propionate accumulation decreased by 32% and 15% at 0.9 V, indicating the system has potential to alleviate acidity suppression. Acidogens and electroactive microorganisms was clearly enriched with increasing applied voltage. Specifically, the abundance of Smithella increased, which could degrade propionate to acetate. Methanosaeta was dominant, accounting for ca. 40.1%∼55.1% of the archaea community at 0.3–1.2 V. Furthermore, the system reinforced psychrophilic methanogenesis by activating important enzymes involved in related metabolism pathways. Overall, this study provides perspective on the future practical application for the regulation of psychrophilic AD in electrochemically integrated bioreactors.
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Accepted/In Press date: 17 February 2023
e-pub ahead of print date: 21 February 2023
Published date: 26 February 2023
Additional Information:
Funding Information:
This study is financially supported by the Science and Technology Commission of Shanghai Municipality Foundation (No. 22230710500) and National Natural Science Foundation of China (No. 51978487).
Publisher Copyright:
© 2023
Keywords:
Bioelectrochemical system, Cathode material, Low temperature, Metabolic pathway, Methane production
Identifiers
Local EPrints ID: 477433
URI: http://eprints.soton.ac.uk/id/eprint/477433
ISSN: 0960-8524
PURE UUID: 2971deb5-2e85-4516-a0c3-d3e48b77c3a2
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Date deposited: 06 Jun 2023 16:56
Last modified: 17 Mar 2024 02:56
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Contributors
Author:
Xiaomei Zheng
Author:
Jun Xu
Author:
Rujing Lin
Author:
Yingying He
Author:
Yaqing Yu
Author:
Li Xie
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