Enhancement of gaseous o-xylene degradation in a microbial fuel cell by adding Shewanella oneidensis MR-1. (August 2020)

• Record Type: Journal Article
• Authors: You, Juping; Deng, Yingying; Chen, Han; Ye, Jiexu; Zhang, Shihan; Zhao, Jingkai
• Is Part Of: Chemosphere. Volume 252(2020)
• Publication Date: 2020-08
• Subjects: MFC -- o-xylene degradation -- S. oneidensis MR-1 -- Electron transfer pathway; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.126571
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: An exoelectrogens, Shewanella oneidensis MR-1 ( S. oneidensis MR-1), was supplied to a microbial fuel cell (MFC) to enhance the degradation of a recalcitrant organic compound, o -xylene. The experimental results revealed that, with the addition of the S. oneidensis MR-1, the o -xylene removal efficiency increased by 35–76% compared with the original MFC. The presence of the S. oneidensis MR-1 not only improved the activity of the biofilm in the bioanode but also developed the connections between the bacteria by nanowires. Therefore, the maximum power density increased from 52.1 to 92.5 mW/m 3 after the addition of the S. oneidensis MR-1. The microbial community analysis showed that adding the S. oneidensis MR-1 increased the biodiversity in bioanode. The dominant exoelectrogens shifted from Zoogloea sp., Delftia sp., Achromobacter sp., Acinetobacter sp., Chryseobacterium sp., and Stenotrophomonas sp. to Zoogloea sp., Delftia sp., Shewanella sp., Achromobacter sp., Hydrogenophaga sp., Sedimentibacter sp. and Chryseobacterium sp.. Furthermore, the cyclic voltammetry analysis showed that the outer membrane bound protein complex of OmcA–MtrCAB was involved as direct electron transfer pathway in the S. oneidensis MR-1 containing bioanode. We believed that this work is promising to provide optional strategy for efficient VOCs degradation by adjusting the microbial community in the bioanode. Graphical abstract: Image 1 Highlights: o -Xylene removal was significantly increased by adding S. oneidensis MR-1. Nanowires improved the activity of biofilm and connections between bacterials. The present of S. oneidensis MR-1 optimized the composition of microbial community. The outer membrane bound MtrCAB complex was involved in electron transfer.