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Photo-Fenton and biological integrated process for degradation of a mixture of pesticides

Paper ID Volume ID Publish Year Pages File Format Full-Text
28514 44079 2007 7 PDF Available
Title
Photo-Fenton and biological integrated process for degradation of a mixture of pesticides
Abstract

A solution of mixed pesticides (alachlor, atrazine, chlorfenvinphos, diuron, isoproturon) was considered for degradation employing photo-Fenton as a preliminary step before biotreatment. Photo-Fenton degradation is an important sub-process in the integrated photobiological process for removal of biorecalcitrant chemicals. Shortening the photo-Fenton treatment time has a critical impact on the economical feasibility of the integrated process. In this study, photo-Fenton was proved to enhance biotraitability of a mixture of biorecalcitrant substances (pesticides). During the photocatalytic process, dissolved organic carbon (DOC) measurements, liquid and ionic chromatography analyses, acute toxicity evaluation using Microtox™ and the Zahn–Wellens biodegradability testing were provided to characterize the photo-treated solutions. In order to find out the best moment for coupling of photocatalytic and biological processes, different times of photo-Fenton pretreatment were tested for biotreatment. The partially photo-treated solutions were fed to eight parallel continuously operated packed-bed bioreactors during 28 days. Considering the coupled system, it was shown that the pre-treated solutions obtained with only 1 g l−1 H2O2 (irradiation time, t30 W = 0.6 h) exhibited higher than 80% of DOC degradation. In this case, the packed-bed bioreactors contributed to more than 50% of the total carbon conversion of the pesticide solution.

Keywords
Pesticide treatment; Photo-Fenton; Biotreatment; Packed-bed bioreactors
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Photo-Fenton and biological integrated process for degradation of a mixture of pesticides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 186, Issue 1, 5 February 2007, Pages 34–40
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