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The Electro-Chemical Treatment for Nitrogen Removal of Metal Finishing Wastewater  

Sim, Joo-Hyun (Department of Environmental Engineering, Inha University)
Seo, Hyung-Joon (Department of Environmental Engineering, Inha University)
Kim, Dae-Hwan (Department of Environmental Engineering, Inha University)
Publication Information
Korean Chemical Engineering Research / v.45, no.2, 2007 , pp. 190-196 More about this Journal
Abstract
This study examined the nitrate removal efficiency which uses an electrowinning, and also analyzed the nitrate removal efficiency under a variety of operating conditions such as nitrate concentrations, pH, current densities, electrodes, reducing agents in order to determine optimal conditions. In addition, the multi-step electro-chemical process test has been also analyzed. During the electrowinning, the identical Zn-Zn and Pt-Ti electrodes in the insoluble oxidation electrode(Pt) has shown the highest nitrate removal efficiency in the 100 mg $NO_3^{-}$ -N/L concentration. In the concentration of 150 mg $NO_3^{-}$ -N/L, the efficiency of the Zn-Zn electrode were 70~85%, and that of Pt-Ti electrode were 40~50% without any change of pH. In the high concentration of 500 and 1,000 mg $NO_3^{-}$ -N/L, the higher the concentration, the more decrease of its nitrate removal efficiency decreased. However, the energy consumed for nitrogen removal increased when the nitrate concentration was high. As a result of the multi-step electro-chemical process test, We chose the Test 4. Because the first, most of the zinc consumed from 1 step was recovered from over the 2 step. The second, amount of consumption anode decreased with insoluble anode Pt from over the 2 step. And the third, Zn cathode increased the possibility of reusing Zn deposited. In view of the results so far achieved, the multi-step electro-chemical process would be applied to treat nitrogen involved in metal finishing wastewater.
Keywords
Electro-Chemical Treatment; Nitrogen Removal; Metal Finishing Wastewater; Multi-step Process;
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Times Cited By KSCI : 3  (Citation Analysis)
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