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On -Site Sodium MyochIorite <br />Generation Systeffl <br />CITY OF NEW ULM, MN <br />In 2017, SEH began working with New Ulm Public Utilities on a <br />Preliminary Engineering Report to install an On -Site Sodium <br />Hypochlorite Generation System at the WTP to replace an <br />existing gaseous chlorine feed system. Design of the system <br />began in 2018 and it went online in late 2018. The system was <br />designed to utilize existing chemical containment bunkers within <br />the WTP's chemical feed room for the salt brine tank and sodium <br />hypochlorite storage tanks. The sodium hypochlorite generation <br />and feed equipment was installed between the bunkers. <br />Through past experience, plant operators have found that <br />chlorine cannot be added to the water until after it is pumped <br />out of the clearwell on its way to the distribution system. They <br />have found that the chlorine present in the backwash water <br />damages the "bugs" in the filter, which is detrimental to their <br />treatment of iron, manganese, and ammonia. <br />SEH paid particular attention to the sodium hypochlorite <br />feed locations for the project. In order to provide operational <br />flexibility, two (2) post -aeration chlorine feed points were <br />installed in case a decision is made to abandon biological <br />treatment. However, the primary chlorine feed point is into <br />the high service pump discharge header. Since water is <br />pumped out of the clearwell into the distribution system at <br />approximately 65 psi, high pressure peristaltic hose pumps <br />were required to pump the sodium hypochlorite into the <br />pipeline. The hose pumps have been operating since early <br />2019, and have required little maintenance after the initial <br />start-up. <br />REFERENCE George Brown <br />Water/District Energy Dept. Supervisor <br />507.233.2132 <br />SEH TEAM <br />Jeff Ledin I Project Manager <br />Kevin Young I Project Engineer <br />Chad Katzenberger I Project Engineer <br />\iter Treatment Plant <br />feasibility Study <br />CITY OF BROOKLYN CENTER, MN <br />The City of Brooklyn Center has nine water supply wells with <br />concentrations of manganese ranging from 0.23 milligrams <br />per liter (mg/L) to 0.59 mg/L. In addition to causing aesthetic <br />problems, the Minnesota Department of Health has issued <br />health guidance values for manganese of 0.1 mg/L for bottle <br />fed infants and 0.3 mg/L for children and adults. <br />To evaluate options for removing manganese from their <br />drinking water, the City of Brooklyn Center hired SEH to <br />prepare a water treatment plant feasibility reportThe team <br />worked closely with City staff to prepare treatment plant <br />design layouts that met the City's needs and provided <br />an operator friendly and efficient layout. In addition, SEH <br />conducted a pilot study on the City's water to verify the <br />optimal treatment process. The feasibility report identified <br />treatment options and backwash water processing options. <br />The report provided building layouts, site layouts, raw <br />water main routing, and renderings of the alternatives. The <br />report evaluated the alternatives based on advantages/ <br />disadvantages, construction costs, and life cycle costs. The <br />final report allowed the City to make informed decisions on <br />their water treatment options based on a thorough evaluation <br />of the alternatives. <br />REFERENCE Mark Hatfield <br />Public Utilities Supervisor <br />763.585.7103 <br />SEH TEAM Miles Jensen I Project Manager <br />Chris Larson I Senior Project Engineer <br />SHORT ELLIOTT HENDRICKSON INC. 24 <br />