Formation of disinfection by-products (DBPs) in swimming pools is a known health concern. Due to its efficiency against pathogens chlorine is extensively used. However, it reacts with organic matter, enhancing DBP formation, which is suspected to be genotoxic. To decrease combined chlorine concentration in pools, MP UV lamps are used but these may produce DBPs. This study results in the thorough understanding of reactions and mechanisms occurring when water is exposed to MP UV light.
The aim of this study was to investigate the effect of radical initiators via addition prior to UV irradiation. The DBPs and more specific total trihalomethane (TTHM) level measured after UV and post-UV chlorination was compared to sample without UV exposure.
Results suggest that chloroforms are not formed in the photo-reactor, but afterwards when chlorine is added. Furthermore, it was found that UV irradiation accelerates DBP formation, but does not clearly increase the total amount formed. Last but not least, UV enhances the amount of bromine and therefore the formation of brominated DBPs.
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Paper: Secondary formation of disinfection by-products by UV treatment of swimming pool water