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study examined the nitrate removal efficiency which uses an electrowinning, and also analyzed the nitrateremoval 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 proces test has been alsoanalyzed. During the electrowining, the identical Zn-Zn and Pt-Ti electrodes in the insoluble oxidation electrode(Pt) has3-N/L concentration. In the concentration of 150 mg NO3-N/L,the eficiency of the Zn-Zn electrode were 70~85%, and that of Pt-Ti electrode were 40~50% without any change of pH. In thehigh concentration of 500 and 1,000 mg NO3-N/L, the higher the concentration, the more decrease of its nitrate removal effi-ciency decreased. However, the energy consumed for nitrogen removal increased when the nitrate concentration was high. Asa result of the multi-step electro-chemical process test, We chose the Test 4. Because the first, most of the zinc consumed from1 step was recovered from over the 2 step. The second, amount of consumption anode decreased with insoluble anode Pt fromover the 2 step. And the third, Zn cathode increased the possibility of reusing Zn deposited. In view of the results so farachieved, the multi-step electro-chemical proces would be aplied to treat nitrogen involved in metal finishing wastewater.