A novel exoelectrogen from microbial fuel cell: Bioremediation of marine petroleum hydrocarbon pollutants

In the past decades, the microbial fuel cell (MFC) technology has caught the attention of the scientific community for its potential in transforming petroleum hydrocarbon (PHC) pollutants directly into electricity through microbial catalyzed anodic. The microbe was one of the most important factors...

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Bibliographic Details
Published in:Journal of environmental management 2019-04, Vol.235, p.70-76
Main Authors: Li, Xiaoling, Zheng, Ruiyu, Zhang, Xuwu, Liu, Zhiwei, Zhu, Ruiyan, Zhang, Xiaoyu, Gao, Dawei
Format: Article
Language:English
Subjects:
Alkali tolerant
Diesel degradation
Exoelectrogen
Salt tolerant
Vibrio
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Summary:In the past decades, the microbial fuel cell (MFC) technology has caught the attention of the scientific community for its potential in transforming petroleum hydrocarbon (PHC) pollutants directly into electricity through microbial catalyzed anodic. The microbe was one of the most important factors that both influence MFCs and PHC degradation. Here we aimed to identify new microbes to expand the list of microbial species which are both electrogenic and diesel hydrocarbon degrading. In this text, we depicted a strain of microbe named E2, isolated from on the anode surface of MFC, and using diesel as sole carbon source. E2 exhibited electrochemical activity in cyclic voltammetry curve, implicating that it had electrogenic ability. E2 degraded about 50% diesel (3.26 g/L) in maximum during 8 days. Pyrosequencing of 16S rRNA gene of E2 revealed E2 was a sub-strain of Vibrio. Corresponding to salt and alkali tolerant properties of vibrio, the optimal condition for E2 in degrading diesel was 3%–4% in salinity, and pH 8–9 in mineral medium. Collectively, as a member of Gammaproteobacteria class, E2 was novel marine microbe both electricity generation and diesel degradation, which may attract its future application toward artificial microbial community construction in MFC in promoting the PHC pollution removal. [Display omitted] •E2 belonging to Vibrio. Sp., was atypical exoelectrogen of a MFC.•E2 degraded PHCs in medium with high salinity and weak alkalinity.•The immobilization of E2 enhanced the PHC degradation efficiency.
ISSN:0301-4797
1095-8630
DOI:10.1016/j.jenvman.2019.01.007