Journal
DESALINATION
Volume 354, Issue -, Pages 181-188Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.desal.2014.10.006
Keywords
Microbial desalination cell (MDC); Desalination; Hexavalent chromium reduction; Electricity production
Categories
Funding
- Program for New Century Excellent Talents in University [NCET-12-0156]
- Open Project of State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology) [2012TS01]
- National Natural Science Foundation of China [51378142]
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The microbial desalination cell (MDC) was a novel technology to desalinate saline water, simultaneously producing electricity and treating wastewater. In our research, an MDC using a synthetic Cr (VI)-containing wastewater as the catholyte was used to desalinate brine in the desalination chamber and simultaneously to reduce Cr (VI) in cathode chamber. Below a pH value of 2.0 with an initial Cr (VI) concentration of 100 mg/L, the hexavalent chromium removal rate was 75.1 +/- 3.8% with a current density 760 mA/m(2), and the desalination rate was 2.1 mg/h. As the initial concentration of chromium increased from 200 to 1000 mg/L, the current density also increased from 884.8 mA/m(2) to 1339.8 mA/m(2), with an increase in the salt removal rate from 2.2 mg/h to 3.0 mg/h. The analyses of scanning electron microscope-energy dispersive spectrometer (SEM-EDS) and X-ray photoelectron spectroscopy (XPS) indicated that the Cr (VI) was reduced to Cr2O3 and deposited on the cathode surface. The deposition of Cr2O3 on the cathode surface would affect the performance of the MDCs. These results suggested that an MDC using Cr (VI) as an electron acceptor could further enlarge the application range of MDCs. (C) 2014 Elsevier B.V. All rights reserved.
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