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DOI: https://doi.org/10.4491/eer.2019.362
Burial depth of anode affected the bacterial community structure of sediment microbial fuel cells
Yi-cheng Wu1,3, Hong-jie Wu1, Hai-yan Fu1, Zhineng Dai1, and Ze-jie Wang2
1Fujian Engineering and Research Center of Rural Sewage Treatment and Water Safety, Xiamen University of Technology, Xiamen, 361024, China
2College of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, China
3Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
Corresponding Author: Ze-jie Wang ,Tel: +86-531-89631680 , Fax: +86-531-89631680 , Email: wangzejie@qlu.edu.cn
Received: August 26, 2019;  Accepted: November 22, 2019.
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Sediment microbial fuel cells (SMFCs) are attractive devices to in situ power environmental monitoring sensors and bioremediate contaminated soils/sediments. Burial depth of the anode was verified to affect the performance of SMFCs. The present research evaluated the differences in microbial community structure of anodic biofilms located at different depth. It was demonstrated that both microbial diversity and community structure of anodic biofilms were influenced by the depth of anode location. Microbial diversity decreased with increased anodic depth. The number of the operational taxonomic units (OTUs) was determined as 1438 at the anode depth of 5 cm, which reduced to 1275 and 1005 at 10 cm and 15 cm, respectively. Cluster analysis revealed that microbial communities of 5 cm and 10 cm were clustered together, separated from the original sediment and 15 cm. Proteobacteria was the predominant phylum in all samples, followed by Bacteroidetes and Firmicutes. Beta- and Gamma-proteobacteria were the most abundant classes. A total of 23 OTUs showed high identity to 16S rRNA gene of exoelectrogens such as Geobacter and Pseudomonas. The present results provided insights into the effects of anode depth on the performance of SMFC from the perspectives of microbial community structure.
Keywords: Biofilm | Burial depth | Microbial community structure | Sediment microbial fuel cell | 454 pyrosequencin
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