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Membrane Water Treatment Volume 4, Number 3, July 2013 , pages 203-214 DOI: https://doi.org/10.12989/mwt.2013.4.3.203 |
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Treatment of organic dye solutions by electrodialysis |
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Katarzyna M. Majewska-Nowak
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| Abstract | ||
| Laboratory tests were performed to determine the efficiency of dye solution desalination by electrodialysis. The study involved anionic dye and mineral salt recovery by obtaining two streams from a salt and dye mixture . dye-rich solution and salt solution. A standard anion-exchange and cation-exchange membranes or monovalent selective anion-exchange membranes were used in the ED stack. It was found that the separation efficiency was strongly dependent on the dye molecular weight. The best results for standard ion-exchange membranes were achieved for the desalination of Direct Black solution. Furthermore, the obtained results implied that the application of monovalent selective anion-exchange membranes improved the recovery of dye and salt solutions — the dye concentration in the diluate remained constant irrespective of the molecular weight of anionic dyes, whereas the salt recovery remained very high (99.5%). | ||
| Key Words | ||
| dye; mineral salt; electrodialysis; monovalent selective anion-exchange membrane | ||
| Address | ||
| Katarzyna M. Majewska-Nowak: Wroclaw University of Technology, Wyb. Wyspianskiego 27, 50-370 Wroclaw, Poland | ||