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WSB PROJECT EXPERIENCE EXAMPLE <br />Advanced Oxidation Process (AOP) Water Treatment Plant <br />CLIENT: ST. ANTHONY VILLAGE <br />LOCATION: ST. ANTHONY VILLAGE, MN <br />DURATION: 2016 - 2018 <br />WSB provided professional engineering services to <br />study, design, and provide construction services for a <br />3,500 gallon per minute (gpm) AOP water treatment plant <br />to treat 1,4-Dioxane. This contaminant was detected in <br />the groundwater aquifer that provides drinking water for <br />the City's wells. <br />After careful study of the advantages, disadvantages, <br />and costs for various treatment options, Ultra -Violet Light <br />with Hydrogen Peroxide was further evaluated as the <br />most feasible treatment option to treat Dioxane in the <br />City's wells. Hydrogen peroxide absorbs ultraviolet (UV) <br />light and produces hydroxyl radicals that oxidize and <br />breakdown Dioxane to non -toxic compounds consisting <br />of carbon dioxide, water, and residual chloride. Prior to <br />the design phase, a UV/Hydrogen Peroxide treatment <br />system was piloted inside St. Anthony Village's existing <br />water treatment plant. Three UV units were installed <br />inside a new masonry and precast concrete building <br />constructed adjacent to the City's existing water <br />treatment plant. The new building includes a chemical <br />storage room for feeding hydrogen peroxide, an <br />electrical room, and a piping gallery. The existing effluent <br />piping from the existing greens and filters was routed <br />into the new WTP addition, metered, and connected to <br />the individual UV treatment units. <br />Automated control valves are used to split the flow <br />between the unit(s) that are called for service via an <br />expanded plant automation control system (PLC/ <br />SCADA) to meet the City's water demands. The treated <br />effluent water from the treatment system is routed back <br />into the pipe gallery of the existing granular activated <br />carbon (GAC) filter building where the excess hydrogen <br />peroxide is quenched and removed by the GAC filters. <br />The St. Anthony Water Treatment Plant is the first <br />advanced oxidation plant constructed in Minnesota that <br />utilizes UV light and hydrogen peroxide. <br />WSB successfully negotiated an $11 million settlement <br />with the US Army to fund the project. This funding is <br />paying for capital and long term O&M costs. <br />KEY WSB STAFF: GREG JOHNSON, GREG GLUNZ, DEAN <br />SJOQUIST, GREG DUERR, DAN SIEBEN, STUART STEPHENS <br />2017 CEAM PROJECT OF THE YEAR <br />SPECIAL RECOGNITION <br />A Proposal for Design, Bidding, and Construction Administration for a <br />Water Treatment Plant for City of Lino Lakes <br />Relative Experience, Qualifications, & References 26 <br />