Laboratory Investigations of Mechanisms for 1,4-Dioxane Destruction by Ozone in Water

摘要

Advances in analytical detection methods have made it possible to quantify 1,4-dioxane contamination in groundwater, even at well-characterized sites where it had not been previously detected. Although 1,4-dioxane is difficult to treat because of its chemical and physical properties, recent benchand pilot-scale testing has shown betterthan-expected effectiveness using ozone with and without hydrogen peroxide. However the reaction rate of ozone with 1,4-dioxane is too slow to account for the decreases in 1,4dioxane concentration observed during in situ treatment of groundwater. It was hypothesized that constituents of the groundwater, such as iron and olefins, acted as catalysts to produce hydroxyl radicals (OH) in situ during treatment with ozone. The hydroxyl radical has a 109 higher reaction rate for the destruction of 1,4-dioxane than does ozone.