Journal
ELECTROCHIMICA ACTA
Volume 135, Issue -, Pages 345-350Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.05.037
Keywords
Microbial anode; electrochemical activity; Ammonia oxidation; nitrogen removal
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Funding
- National Natural Science Foundation of China [31270166]
- Western Light Talent Culture Project [Y3C5031]
- China Postdoctoral Science Foundation [2013M542299]
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences [KLCAs201203]
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In this paper we report ammonia oxidation to nitrogen gas using microbes as biocatalyst on the anode, with polarized electrode (+600 mV vs. Ag/AgCl) as electron acceptor. In batch experiments, the maximal rate of ammonia-N oxidation by the mixed culture was similar to 60 mg L-1 d(-1), and nitrogen gas was the main products in anode compartment. Cyclic voltammetry for testing the electroactivity of the anodic biofilms revealed that an oxidation peak appeared at +600 mV (vs. Ag/AgCl), whereas the electrode without biofilms didn't appear oxidation peak, indicating that the bioanode had good electroactivities for ammonia oxidation. Microbial community analysis of 16S rRNA genes based on high throughput sequencing indicated that the combination of the dominant genera of Nitrosomonas, Comamonas and Paracocus could be important for the electron transfer from ammonia oxidation to anode. (C) 2014 Elsevier Ltd. All rights reserved.
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