Significant decrease of THMs generated during chlorination of river water by previous photo-Fenton treatment at near neutral pH
| Autor: | Alejandro Moncayo-Lasso, A.G. Rincon, Cesar Pulgarin, Norberto Benítez |
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| Rok vydání: | 2012 |
| Předmět: |
By-Products
Solar treatment Drinking-Water General Chemical Engineering General Physics and Astronomy chemistry.chemical_element Molecular-Weight River water Natural organic matter Disinfection by-products polycyclic compounds Chlorine Humic-Acid Humic acid NOM oxidation Waste-Water Neutral ph chemistry.chemical_classification Total organic carbon Drinking water disinfection Advanced oxidation processes General Chemistry Photocatalytic Disinfection Natural Organic-Matter Wastewater chemistry Reagent Environmental chemistry Solar Disinfection Sodis Escherichia-Coli Neutral photo-Fenton Trihalomethanes |
| Zdroj: | Journal of Photochemistry and Photobiology A: Chemistry. 229:46-52 |
| ISSN: | 1010-6030 |
| DOI: | 10.1016/j.jphotochem.2011.12.001 |
| Popis: | 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 mu g/L of THMs are formed during chlorination while values of 20-60 mu g/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. (C) 2011 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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