Membrane and Water Treatment

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Electrodialysis of metal plating wastewater with neutralization pretreatment: Separation efficiency and organic removal

  • Park, Yong-Min (Department of Civil and Environmental Engineering, Konkuk University) ;
  • Choi, Su-Young (Department of Civil and Environmental Engineering, Konkuk University) ;
  • Park, Ki-Young (Department of Civil and Environmental Engineering, Konkuk University) ;
  • Kweon, Jihyang (Department of Civil and Environmental Engineering, Konkuk University)
  • Received : 2020.01.31
  • Accepted : 2020.03.04
  • Published : 2020.05.25
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Abstract

Electrodialysis has been applied for treatment of industrial wastewater including metal electroplating. The wastewater from metal plating industries contains high concentrations of inorganics such as copper, nickel, and sodium. The ions in the feed were separated due to the electrical forces in the electrodialysis. The concentrate compartment is exposed to the elevated concentrations of the ions and yielded inorganic precipitations on the cation exchange membranes. The presence of organic matter in the metal plating wastewater affects complex interfacial reactions, which determines characteristics of inorganic scale fouling. The wastewater from a metal plating industry in practice was collected and the inorganic and organic compositions of the wastewater were analyzed. The performance of electrodialysis of the raw wastewater was evaluated and the effects of adjusting pH of the raw water were also measured. The integrated processes with neutralization and electrodialysis showed great removal of heavy metals sufficient to discharge to aquatic ecosystem. The organic matter in the raw water was also reduced by the neutralization, which might enhance removal performance and alleviate organic fouling in the integrated system.

Keywords

Acknowledgement

This subject is supported by Korea Ministry of Environment (MOE) AS "Technologies for the Risk Assessment & Management Program (2017000140006)". This paper was written as part of Konkuk University's research support program for its faculty on sabbatical leave in 2017.

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