ELECTRODIALYSIS OF EFFLUENTS FROM TREATMENT OF METALLIC SURFACES

Electrodialysis is applied for treatment of effluents from washing after galvanization, and specifically from washing after nickel galvanization. This method is useful for recovery of galvanization reagents used in various processes. Electrodialysis seems to be applicable for treatment of effluents from washing after cyanide galvanization or galvanization with other substances. For the purpose of establishing a closed system for the effluents discharged during the treatment processes for metallic surfaces, techniques for industrialization of electrodialysis have been developed not only for the recovery of useful components, but also for recycled use of water. Industrialization of electrodialysis is expected in the near future. In order to establish these techniques, technical development is needed not only in ion-exchange membranes and electrodialyzers, but also in systematized processes, including all related techniques such as pretreatments. © 1979.