Journal
CHEMICAL ENGINEERING JOURNAL
Volume 252, Issue -, Pages 120-130Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.04.096
Keywords
Textile wastewaters; Integrated processes; Electrocoagulation; Photo-Fenton; Biological oxidation
Categories
Funding
- FEDER through COMPETE -Programa Operational Factores de Competitividade
- FCT -Fundageio para a Ciencia e a Tecnologia
- QREN
- ON2
- Araucaria Foundation
- CAPES [BEX 9794/11-5, 5512/10-7]
- FCT Investigator Programme [IF/01501/2013]
- CNPq
- [PEst-C/EQB/ LA0020/2013]
- Fundação para a Ciência e a Tecnologia [PEst-C/EQB/LA0020/2013] Funding Source: FCT
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The performance of a multistage treatment system for textile wastewater was investigated in this study. The processes of electrocoagulation (EC), photo-Fenton oxidation, and activated sludge biological degradation were integrated in batch mode. The integrated treatment system performance was assessed according to three response variables: dissolved organic carbon (DOC), chemical oxygen demand (COD) and biodegradability index. Based on preliminary tests, the EC-based wastewater treatment was suitable as the first stage of the integrated treatment system, followed by the photo-Fenton process. A lab photo-reactor was used to assess the influence of photo-Fenton variables on the process performance. Based on the better lab photo-Fenton reactor conditions, the improvement of some biological indicators related to the organics biodegradability of treated wastewater was investigated in a pilot-scale photoreactor. An activated sludge-based biological reactor at lab-scale was used as a final treatment stage, in order to achieve the legislated limits for discharge into water bodies. Partial degradation of the organic pollutants was achieved by the EC process, with a 36% reduction in COD. In the second treatment stage, a 70% biodegradability index was attained by setting the photo-Fenton reaction conditions at 100 mg Fe2+ L-1, pH 2.8, 12 mM H2O2 and 6.9 kJ L-1 accumulated energy. Finally, a residual COD of 139 mg O-2 L-1 was achieved at the outlet of the biological process, which is below the maximum limit established by the Portuguese legislation. (C) 2014 Elsevier B.V. All rights reserved.
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