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I Design Criteri-A Grencor <br /> Second Stage or Third Stage Total Nitrogen Loading Rates (TNLR) <br /> • Design average TNLR is 0.007 lbs TN/ft' • d (0.035 kg TN/m2 • d). <br /> The equation for determining TNLR-based treatment size is as follows: <br /> ArNLR=TKNe/TNLR Equation 2.3 <br /> where: ArNLR=Treatment area based on Total Nitrogen Loading,ft2(ml <br /> TKNe=Secondary treated effluent Total Kjeldahl Nitrogen, lbs/d (kg/d) <br /> TNLR=Total nitrogen loading rate, lbs/ft'• d (kg/m2• d) <br /> Second Stage or Third Stage Ammonia Loading Rates(ALR <br /> • Design average ALR is 0.005 lbs NH3-N/ft2 • d (0.025 kg NH3-N/m2 • d) <br /> The equation for determining ALR-based treatment area is as follows: <br /> AALR=TKNe/ALR Equation 2.4 <br /> where: AALR=Surface area based on NH3-N loading,ft'(m2) <br /> TKNe=Secondary treated effluent Total Kjeldahl Nitrogen, lbs/d (kg/d) <br /> ALR=Ammonia loading rate,lbs/ft2 • d(kg/m2 • d) <br /> Design Considerations <br /> Recirculation-Blend Tank Sizing <br /> AdvanTex AX20 and AM 00 Treatment Systems require external recirculation-blend tankage.The following design considerations apply to recircu- <br /> lation-blend tankage for AX20 and AM 00 systems: <br /> • For standard AdvanTex Treatment Systems,recirculation-blend tankage should be sized to at least 75%of the design maximum day flow,or <br /> 100%average day design flow,whichever is greater. <br /> • For Stage 2 AdvanTex Treatment Systems,recirculation-blend tankage should be sized to at least 25%of the design maximum day flow. <br /> AdvanTex AX-Max units are configured with integral recirculation-blend capacity and do not require an external recirculation-blend tank. <br /> Recirculation Pump Sizing <br /> AX20 pods have five laterals and sixty-eight 1B-inch (3-mm)diameter orifices in each pod.A residual pressure of 5 ft(1.5 m) is used to deter- <br /> mine initial timed-dosing settings.Typically, residual pressure ranges from 3 to 6 ft(0.9 to 1.8 m).This may vary depending on system hydraulics <br /> or special treatment requirements.Table 3 provides sizing information for Orenco 4-inch (100-mm)submersible effluent pumps used in AdvanTex <br /> AX20 recirculation pumping assemblies with typical design configurations. <br /> Table 3.Recirculation Pump Sizing,AX20 <br /> Number of Pods Number and Operation of Pumps Nominal Flow Rate 60 Hz Pump Selections 50 Hz Pump Selections <br /> 1 2 pumps,alternate dosing 30 gpm(1.9 Usec) Y2 hp(0.37 kVA; PF3005 3/hp(0.56 k"; PF3005 <br /> 2 2 pumps,alternate dosing 50 gpm(3.2 Usec) Y2 hp(0.37 k"; PF5005 3/hp(0.56 k"; PF5007 <br /> 3 2 pumps,alternate dosing 75 gpm(4.7 Usec) 1 hp(0.7 kVA;PF7510 1 hp(0.7 kVA; PF7510 <br /> 4 2 pumps,1 pump to 2 pods,alternate dosing 50 gpm(3.2 Usec) Y2 hp(0.37 kVA; PF5005 3/hp(0.56 k"; PF5007 <br /> AM 00 pods have four laterals with two spin nozzles per lateral,for a total of eight spin nozzles.The pumping rate is about 50 gpm±per AM 00 <br /> pod (minimum 6 gpm ±per nozzle at 3.0 psi,or 0.38 Usec at 20.7 kPa).Adjusting pressure at the pod inlet can vary flow.Sufficient pump <br /> redundancy is required to ensure operational integrity with one or more inoperable pumps.Table 4 provides sizing information for Orenco 4-inch <br /> (100-mm)submersible effluent pumps used in AdvanTex AX100 recirculation pumping assemblies for typical design configurations. <br /> Orenco Systems°•800-348-9843•+1 541-459-4449•www.orenco.com NDA-ATX-1 <br /> Rev.8,©10/20 <br /> Page 17 of 38 <br />