Combined UV treatment and ozonation for the removal of by-product precursors in swimming pool water
Autor: | Waqas Akram Cheema, Henrik Rasmus Andersen, Kamilla Marie Speht Kaarsholm |
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Rok vydání: | 2017 |
Předmět: |
Environmental Engineering
Ozone 0208 environmental biotechnology chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Water Purification Trihalomethane chemistry.chemical_compound Disinfection by-products Swimming Pools Dissolved organic carbon polycyclic compounds Chlorine By-product Organic matter Reactivity (chemistry) Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering chemistry.chemical_classification Ecological Modeling Contamination Pollution UV 020801 environmental engineering Swimming pool Disinfection chemistry Environmental chemistry Water Pollutants Chemical Disinfectants Trihalomethanes |
Zdroj: | Cheema, W A, Kaarsholm, K M S & Andersen, H R 2017, ' Combined UV treatment and ozonation for the removal of by-product precursors in swimming pool water ', Water Research, vol. 110, pp. 141-149 . https://doi.org/10.1016/j.watres.2016.12.008 |
ISSN: | 0043-1354 |
Popis: | Both UV treatment and ozonation are used to reduce different types of disinfection by-products (DBPs) in swimming pools. UV treatment is the most common approach, as it is particularly efficient at removing combined chlorine. However, the UV treatment of pool water increases chlorine reactivity and the formation of chloro-organic DBPs such as trihalomethanes. Based on the similar selective reactivity of ozone and chlorine, we hypothesised that the created reactivity to chlorine, as a result of the UV treatment of dissolved organic matter in swimming pool water, might also be expressed as increased reactivity to ozone. Moreover, ozonation might saturate the chlorine reactivity created by UV treatment and mitigate increased formation of a range of volatile DBPs. We found that UV treatment makes pool water highly reactive to ozone. The subsequent reactivity to chlorine decreases with increasing ozone dosage prior to contact with chlorine. Furthermore, ozone had a half-life of 5 min in non-UV treated pool water whereas complete consumption of ozone was obtained in less than 2 min in UV treated pool water. The ozonation of UV-treated pool water induced the formation of some DBPs that are not commonly reported in this medium, in particular trichloronitromethane, which is noteworthy for its genotoxicity, though this issue was removed by UV treatment when repeated combined UV/ozone treatment interchanging with chlorination was conducted over a 24-h period. The discovered reaction could form the basis for a new treatment method for swimming pools. |
Databáze: | OpenAIRE |
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