Resource-saving dialysis technology for electroplating wastewater treatment

Abstract

In this work, the separation process of components of electroplating effluent containing sulfuric acid and nickel sulfate by dialysis through various ion-exchange membranes was carried out. Kinetic curves of changes in the concentration of sulfuric acid and nickel sulfate in chambers with permeate and retentate were obtained. The flux densities, nickel losses, the degree of sulfuric acid recovery and the separation factor were calculated. It was shown that the use of cation-exchange membranes does not allow to separate nickel sulfate and sulfuric acid. The use of commercial anion exchange membranes allows 90% sulfuric acid to be recovered with a nickel loss of 8%. The profiling of the anion exchange membranes significantly intensifies the process, but leads to an increase leakage of nickel sulfate through the membranes. The prospects of dialysis wastewater treatment from galvanic production for return of valuable components to production are shown.