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International Journal of Chemical Engineering
Volume 2012, Article ID 179312, 7 pages
Research Article

Study of Chromium Removal by the Electrodialysis of Tannery and Metal-Finishing Effluents

1PROCIMM, State University of Santa Cruz, Road Ilhéus-Itabuna km 16, 45662-000 Ilhéus, BA, Brazil
2DEQ, Federal University of Santa Maria, 97105-900 Santa Maria, RS, Brazil
3PPGEM, Federal University of Rio Grande do Sul, 91501-970 Porto Alegre, RS, Brazil

Received 16 December 2011; Revised 17 April 2012; Accepted 3 May 2012

Academic Editor: Yoshinobu Tanaka

Copyright © 2012 Ruan C. A. Moura et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The metal-finishing and tannery industries have been under strong pressure to replace their current wastewater treatment based on a physicochemical process. The electrodialysis process is becoming an interesting alternative for wastewater treatment. Electrodialysis is a membrane separation technique, in which ions are transported from one solution to another through ion-exchange membranes, using an electric field as the driving force. Blends of polystyrene and polyaniline were obtained in order to produce membranes for electrodialysis. The produced membranes were applied in the recovery of baths from the metal-finishing and tannery industries. The parameter for electrodialysis evaluation was the percentage of chromium extraction. The results obtained using these membranes were compared to those obtained with the commercial membrane Nafion 450.