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<br />Peroxide with Ozone and Bioremediation were not further evaluated but are further <br />discussed in Appendix C. <br />Advanced Oxidation with Ultra-Violet Light and Hydrogen Peroxide <br /> <br />Advanced oxidation processes (AOP) are commercia lly available for treating Dioxane in <br />drinking water. Hydrogen peroxide absorbs ultraviolet (UV) light and produces hydroxyl <br />radicals that oxidize and breakdown Dioxane to non-toxic compounds consisting of <br />carbon dioxide, water, and residual chloride. <br /> <br />The typical UV and hydrogen peroxide treatment system can effectively remove Dioxane <br />from drinking water supplies to levels below the current 1ppb HRL and future levels that <br />may be considered by the EPA (see Figure 1 ). <br /> <br />Figure 1 <br />UV/Hydrogen Peroxide Treatment System, Trojan Technologies UVPhox <br /> <br /> <br />There are currently dozens of surface and groundwater UV-oxidation installations <br />designed for Dioxane removal in operation today. These installations collectively treat <br />over 250 million gallons of drinking water each day. <br /> <br />A UV/Hydrogen Peroxide treatment syste m was pilot ed inside St. Anthony Village's <br />existing water treatment plant with assistance from Trojan Technologies, Inc. on August <br />27, 2015. Representatives of the Minnesota Department of Health were present to <br />observe the pilot study. Water was obtained from a sample tap located downstream of the <br />existing greensand filters and upstream of the existing GAC filters. The pilot water was <br />spiked with excess D ioxane in concentrations ranging between 169 to 197 ppb at variable <br />flow rates ranging from 0.5 to 2.0 gpm to simulate and demonstrate the effectiveness of <br /> <br />1,4-DIOXANE PROJECT <br />FEASIBILITY REPORT <br />CITY OF ST. ANTHONY VILLAGE <br />WSB PROJECT NO. 3183-00 PAGE 14