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Electron acceptors determine the BTEX degradation capacity of anaerobic microbiota via regulating the microbial community
Year:
2022
Source of publication :
environmental research
Authors :
Freilich, Shiri
;
.
Volume :
215
Co-Authors:

Zhiming Wu
Guiping Liu
Yanhan Ji
Pengfa Li
Xin Yu
Wenjing Qiao
Baozhan Wang
Ke Shi
Wenzhong Liu
Bin Liang
Dong Wang
Keren Yanuka-Golub
Shiri Freilich
Jiandong Jiang

Facilitators :
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0
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Total pages:
1
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Abstract:

Anaerobic degradation is the major pathway for microbial degradation of benzene, toluene, ethylbenzene, and xylenes (BTEX) under electron acceptor lacking conditions. However, how exogenous electron acceptors modulate BTEX degradation through shaping the microbial community structure remains poorly understood. Here, we investigated the effect of various exogenous electron acceptors on BTEX degradation as well as methane production in anaerobic microbiota, which were enriched from the same contaminated soil. It was found that the BTEX degradation capacities of the anaerobic microbiota gradually increased along with the increasing redox potentials of the exogenous electron acceptors supplemented (WE: Without exogenous electron acceptors < SS: Sulfate supplement < FS: Ferric iron supplement < NS: Nitrate supplement), while the complexity of the co-occurring networks (e.g., avgK and links) of the microbiota gradually decreased, showing that microbiota supplemented with higher redox potential electron acceptors were less dependent on the formation of complex microbial interactions to perform BTEX degradation. Microbiota NS showed the highest degrading capacity and the broadest substrate-spectrum for BTEX, and it could metabolize BTEX through multiple modules which not only contained fewer species but also different key microbial taxa (eg. PetrimonasAchromobacter and Comamonas). Microbiota WE and FS, with the highest methanogenic capacities, shared common core species such as SedimentibacterAcetobacteriumMethanobacterium and Smithella/Syntrophus, which cooperated with Geobacter (microbiota WE) or Desulfoprunum (microbiota FS) to perform BTEX degradation and methane production. This study demonstrates that electron acceptors may alter microbial function by reshaping microbial community structure and regulating microbial interactions and provides guidelines for electron acceptor selection for bioremediation of aromatic pollutant-contaminated anaerobic sites.

Note:
Related Files :
BTEX degradation
Electron acceptor
Microbial interactions
Syntrophic metabolism
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More details
DOI :
10.1016/j.envres.2022.114420
Article number:
114420
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
62491
Last updated date:
06/11/2022 17:28
Creation date:
06/11/2022 17:27
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Scientific Publication
Electron acceptors determine the BTEX degradation capacity of anaerobic microbiota via regulating the microbial community
215

Zhiming Wu
Guiping Liu
Yanhan Ji
Pengfa Li
Xin Yu
Wenjing Qiao
Baozhan Wang
Ke Shi
Wenzhong Liu
Bin Liang
Dong Wang
Keren Yanuka-Golub
Shiri Freilich
Jiandong Jiang

Electron acceptors determine the BTEX degradation capacity of anaerobic microbiota via regulating the microbial community

Anaerobic degradation is the major pathway for microbial degradation of benzene, toluene, ethylbenzene, and xylenes (BTEX) under electron acceptor lacking conditions. However, how exogenous electron acceptors modulate BTEX degradation through shaping the microbial community structure remains poorly understood. Here, we investigated the effect of various exogenous electron acceptors on BTEX degradation as well as methane production in anaerobic microbiota, which were enriched from the same contaminated soil. It was found that the BTEX degradation capacities of the anaerobic microbiota gradually increased along with the increasing redox potentials of the exogenous electron acceptors supplemented (WE: Without exogenous electron acceptors < SS: Sulfate supplement < FS: Ferric iron supplement < NS: Nitrate supplement), while the complexity of the co-occurring networks (e.g., avgK and links) of the microbiota gradually decreased, showing that microbiota supplemented with higher redox potential electron acceptors were less dependent on the formation of complex microbial interactions to perform BTEX degradation. Microbiota NS showed the highest degrading capacity and the broadest substrate-spectrum for BTEX, and it could metabolize BTEX through multiple modules which not only contained fewer species but also different key microbial taxa (eg. PetrimonasAchromobacter and Comamonas). Microbiota WE and FS, with the highest methanogenic capacities, shared common core species such as SedimentibacterAcetobacteriumMethanobacterium and Smithella/Syntrophus, which cooperated with Geobacter (microbiota WE) or Desulfoprunum (microbiota FS) to perform BTEX degradation and methane production. This study demonstrates that electron acceptors may alter microbial function by reshaping microbial community structure and regulating microbial interactions and provides guidelines for electron acceptor selection for bioremediation of aromatic pollutant-contaminated anaerobic sites.

Scientific Publication
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