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<br />Advantages of AOP Treatment with Ultraviolet Light and Hydrogen Peroxide <br />This option would provide the following advantages: <br /> <br />1. This treatment option physically destroys and removes Dioxane from the <br />environment. While the AOP would reduce the concentrations at the point of <br />consumption, it would also help “clean-up” the Dioxane that exists in the <br />environment. There are no other contaminates created that require hazardous <br />disposal. <br /> <br />2. Cleaning up Dioxane from the aquifer would reduce risk to other users of the <br />aquifer located downstream of St. Anthony Village. <br /> <br />3. The UV and hydrogen peroxide feed system could be implemented with the <br />existing treatment process that already includes pretreatment for iron and <br />manganese and downstream GAC filters for removing excess hydrogen peroxide. <br /> <br />4. The City would maintain complete control of its water supply, water quality, and <br />water rates without being dependent on another water utility. <br /> <br />5. The City would be able to pump each of its wells as needed to meet the City’s <br />water demands unlike the current condition that requires Well No. 4 to be shut <br />down. <br /> <br />6. Dioxane could be effectively removed from the City’s water supply ensuring <br />compliance with the current and future EPA and MDH recommended health risk <br />limits. <br /> <br />7. Other treatment benefits include enhanced disinfection and removal of TCE and <br />other volatile organic compounds (VOCs), N-nitrosodimethylamine (NDMA), <br />endocrine disruptor compounds, and pesticides. <br /> <br /> Disadvantages <br />This option would provide the following disadvantages: <br /> <br />1. Implementing the treatment option would require additional operator training and <br />time to operate and maintain the treatment system. <br /> <br />2. Treatment would involve a significant up-front capital expenditure. <br /> <br />3. The City would be reliant on a single equipment vendor (Trojan Technologies). <br /> <br />4. Although AOP Treatment with Ultraviolet Light and Hydrogen Peroxide appears <br />to have robust treatment capability for a wide array of contaminants, the City <br />would be dependent on the effectiveness of the system in treating other <br />contaminants that may emerge. <br /> <br /> <br />1,4-DIOXANE PROJECT <br />FEASIBILITY REPORT <br />CITY OF ST. ANTHONY VILLAGE <br />WSB PROJECT NO. 3183-00 PAGE 17