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Materials 2014, 7(11), 7349-7365; doi:10.3390/ma7117349

Photo-Electrochemical Treatment of Reactive Dyes in Wastewater and Reuse of the Effluent: Method Optimization

Institut d'Investigació Tèxtil i Cooperació Industrial de Terrassa (INTEXTER), Universitat Politècnica de Catalunya-BarcelonaTech (UPC), C/Colom 15, 08222 Terrassa, Spain
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Received: 1 July 2014 / Revised: 21 October 2014 / Accepted: 4 November 2014 / Published: 14 November 2014
(This article belongs to the Special Issue Advances in Colorants 2014)
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Abstract

In this work, the efficiency of a photo-electrochemical method to remove color in textile dyeing effluents is discussed. The decolorization of a synthetic effluent containing a bi-functional reactive dye was carried out by applying an electrochemical treatment at different intensities (2 A, 5 A and 10 A), followed by ultraviolet irradiation. The combination of both treatments was optimized. The final percentage of effluent decolorization, the reduction of halogenated organic volatile compound and the total organic carbon removal were the determinant factors in the selection of the best treatment conditions. The optimized method was applied to the treatment of nine simulated dyeing effluents prepared with different reactive dyes in order to compare the behavior of mono, bi, and tri-reactive dyes. Finally, the nine treated effluents were reused in new dyeing processes and the color differences (DECMC (2:1)) with respect to a reference were evaluated. The influence of the effluent organic matter removal on the color differences was also studied. The reuse of the treated effluents provides satisfactory dyeing results, and an important reduction in water consumption and salt discharge is achieved. View Full-Text
Keywords: electrochemical; UV irradiation; indirect-oxidation; effluents reuse; reactive dyes; mono-functional; bi-functional; tri-functional electrochemical; UV irradiation; indirect-oxidation; effluents reuse; reactive dyes; mono-functional; bi-functional; tri-functional
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. (CC BY 4.0).

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MDPI and ACS Style

Sala, M.; López-Grimau, V.; Gutiérrez-Bouzán, C. Photo-Electrochemical Treatment of Reactive Dyes in Wastewater and Reuse of the Effluent: Method Optimization. Materials 2014, 7, 7349-7365.

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