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Treatment of 1,4-Dioxane in Groundwater using Advanced Oxidation Process

Paper Title: Treatment of 1,4-Dioxane in Groundwater using Advanced Oxidation Process

Abstract

Treatment of 1,4-Dioxane in Groundwater using Advanced Oxidation Process

In 2004, 1,4!dioxane was detected in the water supply of a
groundwater treatment plant in Ontario, Canada. With no provincial
regulations for 1,4-dioxane in place, the groundwater plant was
proactively shut down. A treat-ability study was initiated to assess the
suitability of various advanced oxidation process (AOP) technologies
for effective reduction of 1,4-dioxane from the water supply. The study
consisted of a literature review, bench-scale and pilot testing. Three
AOP technologies were tested in this study. These included
UV/peroxide, ozone/peroxide, and UV/titanium dioxide, all of which
were capable of destructing 1,4-dioxane to low or non-detectable
level.

Problem

There is a growing problem in the levels of 1,4-Dioxane being found in groundwater. 1,4-Dioxane is not easily adsorbed into soil particles and is difficult to treat because of its high solubility in water. States have different regulations in acceptable levels of 1,4-Dioxane. Alkalinity, chloride, and organics make it difficult for oxidation treatment to break down 1,4-Dioxane.

Testing / Method

Diagram: Treatment of 1,4-Dioxane in Groundwater using Advanced Oxidation Process

An experiment was done in which a high concentration of 1,4-dioxane (300 and 3000 ug/L) and chloride (80 mg/L) were added to water taken from a well. Three advanced oxidation process (AOP) solutions were tested to measure their effectiveness. They included UV/peroxide, ozone/peroxide, and UV/titanium dioxide. Three levels of ozone/peroxide were analyzed: low, medium, and high with hydrogen peroxide levels remaining constant. Samples were taken after treatment and analyzed.

Conclusion / Results

All three AOP technologies tested reduced 1,4-dioxane to acceptable levels. The combination of ozone/peroxide demonstrated the ability to destroy 1,4-dioxane in the well without producing bromate by-product. Figure 7. shows the effectiveness of all three AOP technologies in removing 1,4-Dioxane.

Source

L. Wojcicka, E. Edwards, J. Cavalcante, N. Kodousek, R. Hoffman
Associated Engineering, Suite 800, 304 The East Mall, Toronto, ON, Canada, M9B6E2
Regional Municipality of Waterloo, 150 Frederick St, 7th fl, Kitchener, ON, Canada, N2G4J3
Andrews, Hofmann & Associates, 203 College St, Toronto, ON, Canada, M5t 1P9

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