Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Nitrogen Removal by Electrochemical Oxidation Using the Tube Type Electrode

튜브형 전극을 이용한 전기화학적 산화에 의한 질소제거에 관한 연구

  • 조재준 (경성대학교 공과대학 건설환경공학부) ;
  • 정종식 (경성대학교 공과대학 건설환경공학부) ;
  • 이재복 (경성대학교 공과대학 건설환경공학부)
  • Received : 2003.12.02
  • Accepted : 2004.10.04
  • Published : 2004.10.15
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Abstract

The objective of this research is to investigate the electrochemical oxidation process for nitrogen removal in wastewater involving chloride ion and nitrogen compounds. The process experiment of electrochemical oxidation was conducted by using the stainless steel tube type reactor and the $Ti/IrO_2$ as anode. Free chlorine production and current efficiency variation for total nitrogen removal was compared depending on whether electrolyte is added, and the nitrogen type distribution under an operating condition. When chloride was added as electrolyte, it was found that production of free chlorine increased and the concentration of the chloride decreased as retention time passed. The concentration of chloride in influent decreased from 1,660 to 1,198 mg/L at the current density of $6.7A/dm^2$, while concentration of free chlorine increased to 132 mg/L. Current efficiency in removal of ammonium nitrogen was increased when chloride was dosed as electrolyte. It was observed that ammonium nitrogen was oxidized to nitrite and nitrate through electrochemical oxidation and that the concentration of total nitrogen in influent was reduced from 22.58 to 4.00 mg/L at the short retention time of 168 seconds through the electrochemical oxidation of nitrogen.

Keywords

References

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