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Journal of Analytical Methods in Chemistry
Volume 2015, Article ID 945489, 7 pages
http://dx.doi.org/10.1155/2015/945489
Research Article

Relevance of Toxicity Assessment in Wastewater Treatments: Case Study—Four Fenton Processes Applied to the Mineralization of C.I. Acid Red 14

1Centre Grup de Tècniques de Separació en Química (GTS), Química Analítica, Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
2Institut d’Investigació Tèxtil i Cooperació Industrial de Terrassa (INTEXTER), Universitat Politècnica de Catalunya BarcelonaTech (UPC), Colom 15, 08222 Terrassa, Spain
3Laboratory of Organic Applied Chemistry, Unit of Environmental and Experimental Methodology, Faculty of Sciences Semlalia, University of Cadi Ayyad, 2390 Marrakech, Morocco
4Laboratory of Condensed Matter and Environment, Faculty of Sciences Semlalia, University of Cadi Ayyad, 2390 Marrakech, Morocco

Received 17 November 2014; Accepted 21 May 2015

Academic Editor: Ricardo Jorgensen Cassella

Copyright © 2015 Rajaa Idel-aouad 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.

Abstract

Fenton and Fenton-like processes, both in homogeneous and heterogeneous phases, have been applied to an aqueous solution containing the dye AR 14 in order to study the mineralization and toxicity of the solutions generated after color elimination. The mineralization of AR 14 occurred slower than the decolorization. The Microtox analysis of the treated solutions showed low toxicity intrinsic to the chemicals used in the process rather than the degradation products obtained after the treatment of the dye solution. The dye degradation for the Fenton oxidation process was initially faster than for the Fenton-like process but after a short time, the four processes showed similar degradation yields. All processes have shown good results being the heterogeneous process the most convenient since the pH adjustment is not necessary, the catalyst is recovered and reused and the generation of contaminated sludge is avoided.