Full Description

An ultraviolet light coupled with titanium dioxide (UV/TiOsub2/sub) advanced oxidation pilotsystem was evaluated at the Greenbrook Water Treatment Plant. The objective of the pilotstudy was to evaluate the effect of varying operating parameters on the performance of theUV/TiOsub2/sub system for the concurrent degradation of 1,4-dioxane and removal of iron andmanganese through adsorption onto the TiOsub2/sub surface. It was hypothesized that as iron andmanganese adsorb onto the TiOsub2/sub surface, the degradation of 1,4-dioxane would be impaired.This pilot study showed promising results that suggest UV/TiOsub2/sub advanced oxidation iscapable of concurrent treatment of multiple contaminants. Effective iron removal wasachieved under all tested conditions, while the effective removal of manganese anddegradation of 1,4-dioxane was dependent on operating conditions. A lower flow rate (8L/min) was required for both the removal of manganese under alkaline conditions (pH 8.6),and the degradation of 1,4-dioxane under acidic conditions (pH 5.5) or in the presence ofperoxide (30 mg/L). Thus, the pilot UV/TiOsub2/sub system is able to concurrently remove iron witheither manganese or 1,4-dioxane, but the effective removal of manganese and degradation of1,4-dioxane are competing processes. Results suggest that a higher UV dose (lower flow rate,more UV lamps, or more powerful UV lamps) needs to be applied in order to effectivelyremove all three contaminants. Includes 26 references, figures.

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Edition: Vol. - No. Published: 11/01/2006 Number of Pages: 10 File Size: 1 file , 450 KB