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3. PILOT EQUIPMENT AND SETUP <br />A small portion of the groundwater pumped by Well 6 was routed to WSB's pilot skid for treatment, which <br />was located inside the pilot trailer parked next to Well House No. 6. The treatment equipment used in the <br />pilot skid is described below. <br />Detention Basin: The first treatment unit of the pilot skid was a detention basin. Compressed air <br />was introduced upstream of the detention basin at various flow rates to increase the dissolved <br />oxygen (DO) concentration of the raw water to promote biological growth. A 30-minute detention <br />time was targeted in the detention basin. <br />Transfer Pump: The transfer pump was located downstream of the detention basin and was used <br />to pump water from the detention basin into the filter columns. A pressure reducing valve (PRV) <br />was installed downstream of the pump to maintain an optimal water pressure upstream of the filter <br />columns. <br />Media Filters: Two 6-inch diameter filter columns were operated in parallel and downstream of the <br />transfer pump. The filter media in Filter 1 consisted of 18 inches of silica sand and 12 inches of <br />anthracite, and the filter media in Filter 2 consisted of 18 inches of greensand and 12 inches of <br />anthracite. Both filters had an underdrain system with reverse graded gravel and torpedo sand. <br />Treated water from each filter was discharged near Well House No. 6. <br />Other Equipment: The pilot plant was equipped with flowmeters (air and water), a flow totalizer, <br />pressure gauges, sample taps, an air compressor, and a HACH DR900 colorimeter to test water <br />quality. <br />A flow schematic and photo of WSB's pilot trailer are shown below. <br />Filter 1 Filter 1 <br />Effluent <br />Well 6 Raw Detention Transfer <br />Water � Basin � Pump <br />Filter 2 => Filter 2 <br />Effluent <br />Figure 3-1. WSB's Pilot Trailer at Lino Lakes' Well House No. 6 <br />Water Treatment Pilot Study Report <br />Biological Removal of Ammonia, Iron and Manganese at Well House No. 6 <br />City of Lino Lakes, MN <br />WSB Project No. 018601-000 <br />Page 5 <br />