Author： Li Jing Blatchley Ernest R.
Publisher： Water Environment Federation
ISSN： 1938-6478
Source： Proceedings of the Water Environment Federation, Vol.2007, Iss.1, 2007-01, pp. : 128-133
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Abstract
The photolysis of four model volatile disinfection byproducts (DBPs) (NCl3, CNCHCl2, CNCl and CH3NCl2) and free chlorine was investigated with several different collimated UV sources, including: low-pressure Hg; a KrCl excimer lamp; and a XeBr excimer lamp. Photochemically-induced changes to residual chlorine and DBPs were monitored by membrane introduction mass spectrometry. The results indicate that NCl3 and CH3NCl2 can be successfully degraded by UV irradiation, and the dynamics depend on the wavelength of UV irradiation. Free chlorine changes relatively slowly as a result of UV exposure. The results of these experiments suggest that germicidal UV radiation has the potential to reduce the concentrations of some volatile DBPs in swimming pools.
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