期刊
BIORESOURCE TECHNOLOGY
卷 102, 期 6, 页码 4462-4467出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.12.100
关键词
Biocathode; Microbial fuel cell; Nitrate; Nitrite
资金
- Befesa Agua S.A (CENIT-E TEcoAgua)
- Spanish Government [CONSOLIDER-CSD2007-00055, MCYT-CTQ2008-06865-C02-01/PPQ BES-2006-12277, CGL2009-08338]
Nitrification to nitrite (nitritation process) followed by reduction to dinitrogen gas decreases the energy demand and the carbon requirements of the overall process of nitrogen removal. This work studies autotrophic nitrite removal in the cathode of microbial fuel cells (MFCs). Special attention was paid to determining whether nitrite is used as the electron acceptor by exoelectrogenic bacteria (biologic reaction) or by graphite electrodes (abiotic reaction). The results demonstrated that, after a nitrate pulse at the cathode, nitrite was initially accumulated; subsequently, nitrite was removed. Nitrite and nitrate can be used interchangeably as an electron acceptor by exoelectrogenic bacteria for nitrogen reduction from wastewater while producing bioelectricity. However, if oxygen is present in the cathode chamber, nitrite is oxidised via biological or electrochemical processes. The identification of a dominant bacterial member similar to Oligotropha carboxidovorans confirms that autotrophic denitrification is the main metabolism mechanism in the cathode of an MFC. (C) 2010 Elsevier Ltd. All rights reserved.
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