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Design Criteri-r Grencor Performance Requirements and Unit Sizing Performance of Typical AdvanTex Systems When loaded at or below the applicable loading rates,AdvanTex systems typically achieve<10 mg/L BODS and TSS(30-day average or 30-day arithmetic mean).Total Nitrogen (TN) reduction typically exceeds 60%,with nitrification exceeding 95%,given liquid temperature levels greater than 50°F(10°C)and pH values between 7-9.The loading rates provided in AdvanTex Stage Sizing are based upon these minimum values for liq- uid temperature and pH.With additional components and configurations(see Treatment System Configurations),AdvanTex Treatment Systems can meet more stringent treatment levels. Standard AdvanTex Stage Sizing The primary criteria used to determine the amount of textile surface area necessary to meet treatment requirements are the daily flow volume (Average and Maximum Day), primary-treated effluent Organic Load,Organic Loading Rate(011-111),and Hydraulic Loading Rate(HLR). For facilities that require advanced nitrogen discharge levels(>60%TN or>95% NH3-N),the Ammonia Loading Rate(ALR)or Total Nitrogen Loading Rate (TNLR) should be used in conjunction with the organic and hydraulic loading rates to size the system.The loading rate that corresponds to the largest textile surface area will control the design.AdvanTex Treatment Systems must be sized so that the designed treatment area meets or exceeds that required by the controlling loading rate. Standard AdvanTex Treatment Loading Rates—All Systems: Organic Loading Rates(OLR) • Design Average:0.04 lbs BOD5/ft2 • d (0.2 kg BODS/m2 • d) • Design Maximum Day:0.08 lbs BODS/ft2 • d (0.4 kg BODS/m2 • d) The equation for determining OLR-based treatment area is as follows: AOR=BOD5i/OLR Equation 1.1 where: AOR=Treatment area based on Organic Loading,ft'(m2) BODS = Primary treated effluent BODS(organic) load, lbs/d (kg/d) OLR= Organic loading rate, lbs/ft2 • d (kg/M2 • d) Hydraulic Loading Rates(HLR) • Design Average: 25 gpd/ft2 (1 m3/m2 • d) • Design Maximum Day: 50 gpd/ft2 (2 m3/m2 • d) The equation for determining the HLR-based treatment area is as follows: AHLR=0/HLR Equation 1.2 where: AHLR=Surface area based on Design Average Hydraulic Loading,ft'(m2) 0=Influent hydraulic load,gpd (m3/d) HLR=Hydraulic loading rate,gpd/ft2 • d (m3/m2• d) Systems with Total Nitrogen-Based Discharge Limits: For systems requiring a greater than 60% removal rate for TN,TIN,or NO3-N,the required textile area is determined by using the Total Nitrogen Loading Rate (TNLR)and the TN value(if available)or TKN value(if the TN value isn't available) in the primary treated effluent. (The value for TN and TKN should be the same after anaerobic primary treatment,but it will vary significantly if pre-aeration is used.) Orenco Systems°•800-348-9843•+1 541-459-4449•www.orenco.com NDA-ATX-1 Rev.8,©10/20 Page 15 of 38