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3 EXISTINGWASTEWATER FACILITIES <br /> <br />weir gates. Return sludge flows by gravity to the retum activated sludge (P~kS) pump <br />station. Four vertical turbine pumps lift the activated sludge to a control structure where the <br />IL4S is distributed back to the aeration basins through four parallel pipes. Activated sludge <br />is then subsequently distributed to each aeration basin through a submerged diffuser <br />header. The waste activated sludge (WAS) flow rate is controlled using flow meters and <br />control valves. The WAS flows by gravity to the gravity belt thickener (GBT) and receives <br />subsequent digestion. <br /> <br />Table 3.2.2-3 summarizes the secondary treatment unit processes and equipment at the <br />WPCF. <br /> <br />TABLE 3.2.2-3 <br />WPCF Secondary Treatment Unit Processes and Equipmenl <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> Capacity, (each/total <br /> Equipment Type Quantity firmaAotalb) <br /> <br />Aeration Basins Complete mix or plug flow activated sludge 2 (8 ceils) MMDW 24.5/43/49 MGDc <br /> cells, 135 ftx 135' × 16 ft mdewater depth, MMWW 21/63/75 mgd <br /> Volume = 2.2 MG each, Total Volume = PWWF 111 mgd <br /> 17.6 MG <br /> <br /> Fine Bubble Aeration 7-inch membrane disc d~ffusers, 0.28 sq in 3 10,353/20,706132,538 scfm <br /> each, d~ffusers, Basin t = 4017, Basin 2 = <br /> 4014, Basin 3: 4490. <br /> <br /> Coarse Bubble Coarse bubble stainless stee~ air diffusers, 5 15,000/60,000/75,000 scfm <br /> Aeration 24-inch <br /> <br /> Aeration Blowers Centrifugal multi-stage b~owers, 1000 hp 6 17,000/85,000/102,000 scfm <br /> <br /> Secondary Clarlfiers 130-foot-diameter, 14-foot side water depth, 8 WWMM 9/66/75 mgd <br /> inboard launder, rapid sludge withdrawal DWMM 6/43/49 mgd <br /> mechanism, 44-inch influent column PWWF 111 mgd <br /> <br /> RAS Pump Station Vertical Turbine Pumps - 30-inch 2 23(12)/58/70 mgd <br /> Vertical Turbine Pumps - 24-inch 2 <br /> <br /> Waste Activated One 8-tach gravity wasting, with 6-inch 2 MMDW = 0.41 mgd <br /> Sludge magnetic flow meter and 6-tach flow control MMWW = 0.44 mgd <br /> valve PWWF = 0.78 mgd <br /> <br /> Secondary Scum Vertical centrifugal 2 1,200/1,200/2,700 gpm <br /> Pumps <br /> <br /> Notes: <br /> "Total hrm capacity ~s with iargest unit out -of service. <br /> t~ Total capacity is with al~ units in service. <br /> c Capacity noted is current rated capacity in NPDES permit. <br /> <br /> Disinfection <br /> Chlorine is delivered to the plant in 1-ton cylinders. Chlorinators dL~pense chlorine in the <br /> desired quantities to each application point. The primary use of chlorine at the WPCF is <br /> effluent disinfection. Chlorine is occasionally used to control filamentous bulking organisms <br /> through addition to the R~S line. <br /> <br /> MWMC_3 0_REV11 DOC 3-I ! <br /> <br /> <br />