Membrane and Water Treatment

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Operational conditions of electrochemical oxidation process for removal of cyanide (CN-) in real plating wastewater

  • Zhao, Xin (Department of Environmental Engineering, college of Science and Technology, Korea University) ;
  • Jang, Minsik (Department of Environmental Engineering, college of Science and Technology, Korea University) ;
  • Cho, Jin Woo (Department of Environmental, Energy & Geoinformatics, college of Engineering, Sejong University) ;
  • Lee, Jae Woo (Department of Environmental Engineering, college of Science and Technology, Korea University)
  • Received : 2020.01.11
  • Accepted : 2020.02.20
  • Published : 2020.05.25
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Abstract

An electrochemical oxidation process was applied to remove cyanide (CN-) from real plating wastewater. CN- removal efficiencies were investigated under various operating factors: current density and electrolyte concentration. Electrolyte concentration positively affected the removal of both CN- and Chemical Oxygen Demand (COD). As the electrolyte concentration increased from 302 to 2,077 mg Cl-/L, removal efficiency of CN- and COD increased from 49.07% to 98.30% and from 23.53% to 49.50%, respectively, at 10 mA/㎠. Current density affected the removal efficiency in a different way. As current density increased at a fixed electrolyte concentration, CN- removal efficiency increased while COD removal efficiency decreased, this is probably due to lowered current efficiency caused by water electrolysis.

Keywords

Acknowledgement

This study was supported by the Korea Ministry of the Environment (MOE) as "Technologies for the Risk Assessment & Management Program (2017000140007)".

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