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Degradation of a textile azo dye using biological treatment followed by photo-Fenton oxidation: Evaluation of toxicity and microbial community structure
Department of Biotechnology, Lund University, Lund, Sweden .
Mälardalen University, School of Business, Society and Engineering, Future Energy Center. Department of Biotechnology, Lund University, Lund, Sweden .ORCID iD: 0000-0002-0137-2194
Department of Biotechnology, Lund University, Lund, Sweden .
School of Education and Environment, Kristianstad University, Kristianstad, Sweden .
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2015 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 270, 290-299 p.Article in journal (Refereed) Published
Abstract [en]

Many commercial dye preparations are cocktails of active dyes and various by-products that are recalcitrant to biological degradation and end up in significant amounts in the effluent after the dyeing process. Conventional wastewater treatment processes are not able to degrade such compounds and detoxify the effluent, thus alternative treatments should be developed.In our work we suggest to use photo-Fenton oxidation as post-treatment after an anaerobic biofilm process, in a way to minimize the reagents needed. This process was used for treatment of synthetic textile wastewater containing the commercial azo dyestuff Remazol Red, starch and sodium chloride. The treated textile effluent had COD lower than 18. mg/l even when using initial Fenton reagents concentration as low as 1. mM ferrous ions and 10. mM hydrogen peroxide. The acute toxicity was higher in the biologically treated than in the untreated effluent. Photo-Fenton oxidation successfully reduced the toxicity and the final effluent was non-toxic to Artemia salina and Microtox, with the exception of the effluent containing high concentration of sodium chloride, which was moderately toxic to Microtox. For the first time the presence of algae was detected in a reactor treating textile wastewater using denaturing gradient gel electrophoresis (DGGE); bacteria and fungi were also abundant.The results of this study suggest that using advanced oxidation after biological treatment is an effective way to degrade the organic compounds and remove toxicity from textile effluents.

Place, publisher, year, edition, pages
2015. Vol. 270, 290-299 p.
Keyword [en]
Azo dye, Biofilm, DGGE, Photo-Fenton, Textile wastewater, Toxicity, Azo dyes, Biochemical engineering, Biofilms, Biological water treatment, Chemical oxygen demand, Effluent treatment, Effluents, Electrophoresis, Oxidation, Sodium chloride, Textiles, Biological degradation, Denaturing gradient gel electrophoreses (DGGE), Microbial community structures, Photo-fenton oxidations, Wastewater treatment process, Wastewater treatment, algae, Artemia salina, Fungi
National Category
Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-27673DOI: 10.1016/j.cej.2015.02.042Scopus ID: 2-s2.0-84923628137OAI: oai:DiVA.org:mdh-27673DiVA: diva2:793621
Available from: 2015-03-09 Created: 2015-03-06 Last updated: 2016-12-22Bibliographically approved

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