Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Optimization for Removal of Nitrogen Using Non-consumable Anode Electrodes

비소모성 Anode(산화전극)을 이용한 질소 제거 최적화

  • Hyunsang, Kim (Department of Convergence Engineering, Graduate School of Venture, Hoseo University) ;
  • Younghee, Kim (Department of Convergence Engineering, Graduate School of Venture, Hoseo University)
  • 김현상 (호서대학교 벤처대학원 융합공학과) ;
  • 김영희 (호서대학교 벤처대학원 융합공학과)
  • Received : 2022.07.06
  • Accepted : 2022.09.05
  • Published : 2022.12.30
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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.

폐수 중 질소를 제거하기 위한 전기화학적 방법 중 전극의 소모를 최소화하기 위하여 비용해성 전극인 DSA 전극을 anode(산화전극)로 사용하면서, 최적 cathode(환원전극) 도출 및 운전조건 최적화를 위한 연구를 수행하였다. 다양한 전극을 cathode(환원전극)로 사용하여 실험한 결과, 용액 중 Cl 존재시 질산성 질소(NO3-N)의 제거율이 가장 높으면서 부산물인 암모니아성 질소(NH3-N) 농도가 가장 낮게 나타난 Brass(황동)가 최적 전극으로 선정되었다. 전류밀도에 따른 영향을 조사하였을 때, 초기 질산성 질소의 농도가 50 mg L-1의 조건에서, 최적 전류밀도는 15 mA cm-2이었고, 그 이상의 전류밀도는 제거율에 큰 영향을 주지 못하였다. 전해물질(Na2SO4와 NaCl) 및 반응시간에 따른 질산성 질소(NO3-N) 제거 및 암모니아성 질소(NH3-N) 잔류량을 조사하였을 때, 질산성 질소(NO3-N)의 초기 농도 50 mg L-1, 전류밀도 15 mA cm-2의 조건에서 90분 반응 시 Na2SO4과 NaCl을 각각 1.0 g L-1, 0.5 g L-1 혼합하였을 때, 질산성 질소의 제거율은 약 48%였고 암모니아성 질소는 잔류하지 않았다. 전해물질로 NaCl만 1.5 g L-1를 사용하였을 때, 질산성 질소(NO3-N)의 제거율은 약 55%로 가장 높았고, 암모니아 질소도 잔류하지 않았다.

Keywords

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