AWWA WQTC64108

An ultraviolet light coupled with titanium dioxide (UV/TiO₂) 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/TiO₂ system for the concurrent degradation of 1,4-dioxane and removal of iron andmanganese through adsorption onto the TiO₂ surface. It was hypothesized that as iron andmanganese adsorb onto the TiO₂ surface, the degradation of 1,4-dioxane would be impaired.This pilot study showed promising results that suggest UV/TiO₂ 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/TiO₂ 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.

Product Details

Edition:

Vol. - No.

Published:

11/01/2006

Number of Pages:

10

File Size:

1 file , 450 KB