Journal
BIOELECTROCHEMISTRY
Volume 136, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2020.107623
Keywords
Microbial fuel cell (MFC); Long-term operation; Oxytetracycline (OTC); Microbial community; Electrochemical properties
Funding
- National Natural Science Foundation of China [21677047, 51808199]
- China Postdoctoral Science Foundation [2018M630825, 2019T120624]
- Plan for University Scientific Innovation Talent of Henan Province [19HASTIT046]
- Innovation Scientists and Technicians Troop Construction Projects of Henan Province, PR China
- Henan Normal University [20180545]
- Scientific and Technological Research Projects of Henan Province, China [172102210449, 192102310176]
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Dynamic changes in power generation and electrochemical properties were compared between the control microbial fuel cells (C-MFC) and an oxytetracycline (OTC)-treated MFC (O-MFC) on days 84, 139, 174, 224, 295, 307 and 353. The results showed that a high concentration of OTC (>5 mg.L-1) could inhibit microbial activity and result in a decline of voltage output and power density compared with the same C-MFC. However, with the prolongation of incubation time, the inhibitory effect was gradually weakened. Electrochemical analyses demonstrated that long-term OTC acclimation reduced the ohmic and polarisation resistance of the anode, which was conducive to the recovery of electrochemical performance. More than 99% of 10 mg.L-1 OTC could be removed within 48 h, and the antibacterial activity of the MFC effluent on Escherichia coli DH5 alpha was conclusively eliminated. High-throughput sequencing analysis revealed that the diversity and richness of the microbial community decreased significantly after long-term OTC enrichment. Acinetobacter, Petrimonas, Spirochaetaceae and Delftia were enriched and played a dominant role in C-MFC stability and power generation. The promotion by Cupriavidus, Geobacter and Stenotrophomonas in simultaneous OTC degradation and bioelectricity generation in the O-MFC was demonstrated. (C) 2020 Published by Elsevier B.V.
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