Water Treatment Plant – Lakengren Water Authority – Preble County, OH
The Lakengren Water Authority (LWA) located in Preble County, Ohio, provides water and sewer service to a community developed around Lakengren Lake in 1970. The water system currently serves more than 1,300 homes in the development. The LWA obtains water from three shallow sand and gravel wells that pump to a central treatment facility. The source water contains elevated levels of iron and manganese. Rapid growth in the development resulted in the need to evaluate the capacity of the existing facilities and develop a long-term plan for meeting future water needs.
We were hired to design the new filtration facility along with upgrades to each of the well pumps. The facility is designed to treat 685 gpm and includes induced draft aeration, chemical addition, rapid rate gravity filtration, detention, and high service pumping. The filter is an open-type, four cell filter of concrete construction. The filter media consists of sand and anthracite. Chemical treatment includes the addition of chlorine. Potassium permanganate is also added to aid in the treatment process. Filtered water passes through a below-grade, 100,000-gallon concrete reservoir before being pumped to distribution with three vertical turbine high service pumps.
Backwash waste from the filter flows by gravity to a red water detention basin before being pumped through a force main to the LWA sanitary system. The project included a pump station at the red water detention basin and more than 800 feet of force main.