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Significant decrease of THMs generated during chlorination of river water by previous photo-Fenton treatment at near neutral pH

Paper ID Volume ID Publish Year Pages File Format Full-Text
26532 43960 2012 7 PDF Available
Title
Significant decrease of THMs generated during chlorination of river water by previous photo-Fenton treatment at near neutral pH
Abstract

An important issue in chlorine drinking water disinfection is the generation from natural organic matter (NOM) of disinfection by-products (DBPs), especially trihalomethanes (THMs). The THMs generation can be limited by reducing the levels of NOM prior to the chlorination step. Herein, photo-Fenton system under solar simulator degraded humic acid solutions (as NOM model compounds), as well as NOM contained in river water (Pance River, Cali-Colombia), and dramatically reduced THMs formation during the subsequent chlorination step. In both cases the initial pH of treated water was near to 7. In no pre-treated river water 100–160 μg/L of THMs are formed during chlorination while values of 20–60 μg/L were reached in water previously treated for 4 h by neutral photo-Fenton under solar simulator. The decrease in the generated THMs/total organic carbon ratio suggests that mainly the NOM fraction sensitive to THMs formation was photo-degraded. Therefore, the neutral photo-Fenton reagent could be implemented as a technological option for NOM removal for limiting THMs formation during a subsequent chlorination step.

► THMs generation decrease by reducing NOM concentration prior to the chlorination step. ► Photo-Fenton process at neutral pH is effective system for the NOM degradation. ► Solar photo-Fenton process can be used to obtain at low cost drinking water safe.

Keywords
Advanced oxidation processes; Solar treatment; Neutral photo-Fenton; Trihalomethanes; NOM oxidation; Drinking water disinfection; Disinfection by-products
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Significant decrease of THMs generated during chlorination of river water by previous photo-Fenton treatment at near neutral pH
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 229, Issue 1, 1 February 2012, Pages 46–52
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