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Membrane Water Treatment Volume 11, Number 3, May 2020 , pages 179-187 DOI: https://doi.org/10.12989/mwt.2020.11.3 (Specia |
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Electrodialysis of metal plating wastewater with neutralization pretreatment: Separation efficiency and organic removal |
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Yong-Min Park, Su-Young Choi, Ki-Young Park and Jihyang Kweon
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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. | ||
| Key Words | ||
| electrodialysis; metal plating wastewater; inorganic; organic; neutralization | ||
| Address | ||
| Department of Civil and Environmental Engineering, Konkuk University 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea | ||
