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http://dx.doi.org/10.7464/ksct.2022.28.4.309

Optimization for Removal of Nitrogen Using Non-consumable Anode Electrodes  

Hyunsang, Kim (Department of Convergence Engineering, Graduate School of Venture, Hoseo University)
Younghee, Kim (Department of Convergence Engineering, Graduate School of Venture, Hoseo University)
Publication Information
Clean Technology / v.28, no.4, 2022 , pp. 309-315 More about this Journal
Abstract
Research was conducted to derive the optimal operation conditions and the optimal cathode for using a DSA electrode as an anode to minimize electrode consumption during the removal of nitrogen from wastewater by the electro-chemical method. Of the various electrodes tested as cathodes, brass was determined to be the optimal electrode. It had the highest NO3-N removal rate and the lowest concentration of residual NH3-N, a by-product when Cl is present in the solution. Investigating the effect of current density found that when the initial concentration of NO3-N was 50 mg L-1, the optimal current density was 15 mA cm-2. In addition, current densities above 15 mA cm-2 did not significantly affect the NO3-N removal rate. The effect of electrolytes on removing NO3-N and minimizing NH3-N was investigated by using Na2SO4 and NaCl as electrolytes and varying the reaction times. When Na2SO4 and NaCl are mixed at a ratio of 1.0 g L-1 to 0.5 g L-1 and reacted for 90 min at a current density of 15 mA cm-2 and an initial NO3-N concentration of 50 mg L-1, the removal rate of NO3-N was about 48% and there was no residual NH3-N. On the other hand, when using only 1.5 g L-1 of NaCl as an electrolyte, the removal rate of NO3-N was the highest at about 55% and there was no residual NH3-N.
Keywords
Electro-chemical method; Nitrate; Total nitrogen; DSA; Optimal cathode;
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