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'TW-51 <br /> 3 FACILITIES DESIGN <br /> 3.1 HEADWORKS <br /> The raw sewage from the sewer system enters the WCMCRWWTP at the inlet lift station. There, <br /> two submersible pumps are installed to deliver raw sewage to the packaged WWTP. Each pump <br /> has a 80 gpm flow capacity and 20 ft TDH. The inlet screen unit functions to remove suspends, <br /> grits, and FOG (fat, oil, and grease). The screen unit has the capability to handle 120 gpm. <br /> The 1-inch Magmeter is installed behind the inlet screen unit for continuous flow <br /> measurements. <br /> 3.2 MBBR SYSTEMS <br /> This packaged MBBR system consists of an anoxic zone and an aerobic zone, these zones <br /> functioning to remove organic matter (BODS), TSS, and nutrients (TN). Two identical trains will <br /> be installed to meet the State requirements for biological wastewater treatments. The internal <br /> recycle pump returns the flow from the end of the aerobic zone to the front of the anoxic zone, <br /> for the purpose of nitrogen removal. This unit's process is designed based upon the following <br /> procedures: <br /> DETERMINATION OF ANOXIC ZONE VOLUME <br /> __ QSo <br /> V. X JF/M) <br /> Where V.. = anoxic zone volume, gallons <br /> FIM = food to microorganism ratio, g BODS/g MLVSS.d <br /> Q = flowrate, gpd <br /> So = influent BODS concentration, mg/L <br /> Xb = anoxic zone biomass concentration, mg/L MLVSS <br /> DETERMINATION OF INTERNAL RECYCLE RATIO OF ANOXIC ZONE <br /> IR = NOx —1.0 <br /> Ne <br /> Where IR = internal recycle ratio <br /> NOX = nitrate produced in aeration zone, mg NO3-N/L <br /> Ne = effluent NO3-N concentration, mg NO3-N/L <br /> DETERMINATION OF AEROBIC ZONE VOLUME <br /> V = <br /> QSo <br /> XMLvss(F/M) <br /> Wine Cup Motor Coach Resort WWTP Page 5 of 10 8/22/2007 <br /> Preliminary Design Report <br />