Abstract
Metal finishing wastewater containing ions of Zn, Ni, Cu, Fe and Al, as well as of Na and CN- in alkaline pH was treated by electrodialysis. The treatment was conducted in a laboratory cell and in a pilot plant unity. The experiments were carried out using Nafion and Selemion membranes. Results showed most of the metallic ions to have an anionic nature, due to the formation of coordination complexes. Each metallic ion showed a different rate of extraction from the treated solution, depending on the galvanostatic or potentiostatic operation mode. Zn, Ni and Cu have shown higher extraction under galvanostatic control. For Al, higher extraction was observed when the experiment was conducted in a potentiostatic mode. Fe ions exhibited an unexpected behavior, not being removed in the same way as the other ions. The best extraction results were obtained within 2-3 h of treatment.
Highlights
In recent years, there has been a surge of scientific interest in the treatment of metal finishing wastewater, in particular, the substitution of conventional hazardous processes with new benign environmental processes.[1]
Electrodialysis employs a membrane separation technique where ions are transported through ion selective barriers from one solution to another using an electric field as the driving force.[3]
Evaluation of the Electrodialysis Process for the Treatment of Metal Finishing Wastewater blocked by the cation-selective membranes
Summary
There has been a surge of scientific interest in the treatment of metal finishing wastewater, in particular, the substitution of conventional hazardous processes with new benign environmental processes.[1]. Evaluation of the Electrodialysis Process for the Treatment of Metal Finishing Wastewater blocked by the cation-selective membranes.
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