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GrenCOr <br /> Design , <br /> Total Nitrogen Loading Rates (TNLR) <br /> • Design average TNLR is 0.014 lbs TN/ft' • d (0.07 kg TN/m2 • d). <br /> The equation for determining TNLR-based treatment size is as follows: <br /> ArNLR=(TKNi or TNj)/TNLR Equation 1.3 <br /> where: ArNLR=Treatment area based on Total Nitrogen Loading,ft'(m2) <br /> TKN = Primary treated effluent Total Kjeldahl Nitrogen load, lbs/d (kg/d) <br /> TN = Primary treated effluent Total Nitrogen load, lbs/d (kg/d) <br /> TNLR=Total nitrogen loading rate, lbs/ft2 • d (kg/m2 • d) <br /> Systems with Ammonia-Based Discharge Limits: <br /> For applications requiring ammonia or TKN removal greater than 95%, use both the ALR (see below) and the TNLR (Equation 1.3) and <br /> choose the greater of the two values.ALR for primary-treated effluent ammonia and TNLR accounts for any organic nitrogen that may <br /> be converted to ammonia through the primary or secondary treatment processes (see Ammonification). <br /> Ammonia Loading Rates(ALR) <br /> • Design average ALR is 0.01 lbs NH3-N/ft2 • d (0.05 kg NH3-N/m2 • d) <br /> The equation for determining ALR-based treatment area is as follows: <br /> AALR= NH3-Ni/ALR Equation 1.4 <br /> where: AALR=Surface area based on NH3-N loading,ft'(m2) <br /> NH3-Ni = Primary treated effluent Ammonia load, lbs/d (kg/d) <br /> ALR=Stage 1 Ammonia loading rate, lbs/ft2 • d (kg/m2• d) <br /> Second Stage or Third Stage AdvanTex Sizing in Two-Stage and Three-Stage Systems <br /> For the calculation of second stage or third stage AdvanTex treatment area, use BOD5e and TKNe—the treated effluent values from <br /> the Standard AdvanTex Treatment system. Standard AdvanTex Stage treated effluent values for BODS and TKN are typically based upon <br /> 95% nitrification and 70% denitrification through the Pre-Anoxic Stage and Standard AdvanTex Treatment Stage. See Appendix B for <br /> example calculation. <br /> Second Stage or Third Stage Organic Loading Rates(OLR) <br /> • Design Average: 0.02 lbs BOD S/ft2 • d (0.1 kg BODS/m2 • d) <br /> • Design Maximum Day: 0.04 lbs BOD5/ft2 • d (0.2 kg BODS/m2 • d) <br /> The equation for determining OLR-based treatment area is as follows: <br /> AOR= BOD5e/OLR Equation 2.1 <br /> where: AOR=Treatment area based on Organic Loading,ft'(m2) <br /> BOD5e=Secondary treated effluent BODS(organic) load, lbs/d (kg/d) <br /> OLR= Organic loading rate, lbs/ft2• d (kg/m2 • d) <br /> Second Stage or Third Stage Hydraulic Loading Rates(HLR) <br /> • Design Average: 75 gpd/ft2 (3 m3/m2 • d) <br /> • Design Maximum Day: 125 gpd/ft2 (5 m3/m2 • d) <br /> The equation for determining HLR-based treatment area is as follows: <br /> AHLR=0/HLR Equation 2.2 <br /> where: AHLR=Surface area based on Design Average Hydraulic Loading,ft2(m2) <br /> Q = Influent hydraulic load, gpd (m3/d) <br /> HLR= Hydraulic loading rate,gpd/ft2 • d (m3/m2 • d) <br /> NDA-ATX-1 Orenco Systems®•800-348-9843•+1 541-459-4449•www.orenco.com <br /> Rev.8,@ 10/20 <br /> Page 16 of 38 <br />