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Membrane Water Treatment
  Volume 12, Number 4, July 2021 , pages 157-164
DOI: https://doi.org/10.12989/mwt.2021.12.4.157
 

Electrochemical reduction of nitrate using divided electrolytic cell by proton exchange membrane
Ho Young Cha, Youngho Park, Kee-Won Seong and Ki Young Park

 
Abstract
    The electrochemical reduction of nitrate using a divided electrolytic cell in combination with Zn cathode and (Pt)/Ti anode reduced the high concentrations of nitrate (1,000 mg NO3-N/L). A proton exchange membrane (Nafion-117) was used to increase the nitrate reduction efficiency by preventing the re-oxidation of nitrite produced during the reduction process. The current density and anolyte concentration, considered as parameters, were tested to assess the electrochemical reduction of nitrate. The reduction of nitrate shortened the electrolysis time in proportion to the current density, and the time for 90% removal was 5 h at 5 mA/cm2, 3 h at 10 mA/cm2, and 1.8 h at 20 mA/cm2. The yields of ammonia were approximately 50%-55% of the initial nitrate-nitrogen concentration regardless of the current density and was insignificantly related to the anolyte concentration.
 
Key Words
    anolyte concentration; divided electrolytic cell; electrodialysis; limiting current density; proton exchange membrane
 
Address
Ho Young Cha: Department of Civil and Environmental Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea / Department of Civil and Environmental Engineering, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 05006, Korea

Youngho Park, Kee-Won Seong and Ki Young Park: Department of Civil and Environmental Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea

 

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