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Electrochemical removal of nitrate using ZVI packed bed bipolar electrolytic cell

Title
Electrochemical removal of nitrate using ZVI packed bed bipolar electrolytic cell
Author
박주양
Keywords
Bipolar electrolytic cell; Nitrate removal; Zero valent iron; Magnetite
Issue Date
2012-05
Publisher
Elsevier Science B.V., Amsterdam.
Citation
Chemosphere, Vol.89, No.2 [2012], p172-178
Abstract
The present study investigates the performance of the zero valent iron (ZVI, Fe0) packed bed bipolar electrolytic cell for nitrate removal. The packing mixture consists of ZVI as electronically conducting material and silica sand as non-conducting material between main cathode and anode electrodes. In the continuous column experiments for the simulated groundwater (initial nitrate and electrical conductivity of about 30mgL−1 as N and 300μScm−1, respectively), above 99% of nitrate was removed at the applied potential of 600V with the main anode placed on the bottom of reactor. The influx nitrate was converted to ammonia (20% to maximum 60%) and nitrite (always less than 0.5mgL−1 as N in the effluent). The optimum packing ratio (v/v) of silica sand to ZVI was found to be 1:1–2:1. Magnetite was observed on the surface of the used ZVI as corrosion product. The reduction at the lower part of the reactor in acidic condition and adsorption at the upper part of the reactor in alkaline condition are the major mechanism of nitrate removal.
URI
http://www.sciencedirect.com/science/article/pii/S0045653512007515?via%3Dihubhttp://hdl.handle.net/20.500.11754/66916
ISSN
0045-6535
DOI
10.1016/j.chemosphere.2012.05.104
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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