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UV/Hsub2/subOsub2/sub advanced oxidation of drinking water for taste and odor control was performed atpilot- and bench-scale using natural surface waters to optimize treatment conditions and monitorthe effects on chlorine decay, chloramine decay, and disinfection byproduct formation. The pilotstudy demonstrated that the optimal dose of hydrogen peroxide for the removal of two taste andodor compounds (geosmin and MIB) was 6-10 mg/L. From bench-scale simulated distributionsystem tests, both ultraviolet (UV) alone (at an estimated dose of 10000 mJ/cmsup2/sup) and UV/Hsub2/subOsub2/sub resulted insignificantly lower levels of chlorine residual compared to the control. The effects of the level ofadvanced oxidation applied on the chlorine residual were water-specific, with both increasingand decreasing trends. Similar results were observed for chloramine decay in natural surfacewaters, although decreases in chloramine decay were much less significant than with chlorine.Effects of advanced oxidation on disinfection byproducts (DBPs) were also water-specific. THMs increased with theapplication of UV or UV/Hsub2/subOsub2/sub in two of three water samples, while in one sample, trihalomethanes (THMs)increased at lower levels of advanced oxidation and decreased with higher levels of advancedoxidation or with high doses of UV alone. Haloacetic Acids (HAAs) decreased significantly (by up to 138 g/L)with the application of UV or UV/Hsub2/subOsub2/sub in two samples, but increased slightly (25 g/L or less)following advanced oxidation in the third water sample.Results from this research highlight the importance of performing comprehensive site-specificevaluations when establishing the feasibility of using UV/Hsub2/subOsub2/sub for taste and odor control, sinceapparently it may have a significant impact on secondary disinfectant stability and DBPformation in the distribution system in some waters. Includes 8 references, figures.

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Edition: Vol. - No. Published: 11/01/2006 Number of Pages: 6File Size: 1 file , 330 KB