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Comparison of anaerobic pre-treatment and aerobic post-treatment coupled to photo-Fenton oxidation for degradation of azo dyes

Paper ID Volume ID Publish Year Pages File Format Full-Text
27326 44016 2011 7 PDF Available
Title
Comparison of anaerobic pre-treatment and aerobic post-treatment coupled to photo-Fenton oxidation for degradation of azo dyes
Abstract

Photo-Fenton oxidation was used for treatment of synthetic textile wastewater as stand alone treatment, as pre-treatment before aerobic biological treatment and as post-treatment after anaerobic biological treatment. The processes were compared with regards to decolorization, chemical oxygen demand (COD) reduction and chemical consumption. When applying photo-Fenton alone for treatment of Remazol Red RR (100 mg/l), optimal conditions were 3.0 mM H2O2 and 0.25 mM Fe2+. These conditions resulted in complete decolorization and a residual COD of 2.9 mg/l. When reducing the H2O2 dose to 1 mM, residual COD was 22 mg/l. In the combined photo-Fenton/aerobic treatment complete decolorization and COD removal was achieved at 3 mM H2O2 and 0.25 mM Fe2+, while 9 mg/l of residual COD remained at the H2O2 concentration 1 mM. When applying photo-Fenton as post-treatment after the anaerobic step, the residual COD was 14 mg/l independent of the H2O2 concentration being set to 1 or 3 mM, however the Fe2+ concentration needed to be increased to 2 mM, due to complex formation with the phosphate added as a macronutrient. Phytotoxicity tests showed higher residual toxicity after the photo-Fenton treatment alone than after the combined processes. Our results thereby show that incorporation of a biological step leads to improved mineralization and reduced residual toxicity at lower H2O2 doses.

► Complete dye decolorization and 2.9 mg/l residual COD achieved using photo-Fenton. ► Comparison of aerobic and anaerobic treatment coupled to photo-Fenton. ► Incorporation of a biological step improved mineralization at lower H2O2 doses.

Keywords
Aerobic; Anaerobic; Azo dyes; Combined process; Photo-Fenton
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Comparison of anaerobic pre-treatment and aerobic post-treatment coupled to photo-Fenton oxidation for degradation of azo dyes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 224, Issue 1, 15 November 2011, Pages 55–61
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us