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Design <br /> Total Nitrogen Loading <br /> Design average TNLRA is 0.014 lbs TKN/ft2(from page 15). Use Equation 131 from Appendix B to determine the pounds per day of Average <br /> Day Nitrogen Load,TNLA : <br /> Determine the textile area required based on Average Day Nitrogen Load,'TNLRA using Equation 1.3: <br /> TNLA,lbs/d= (50 mg/L) * (8.34 x 10-6 lbs•L/mg•gal)* (5,400 gpd) = 2.251bs/d <br /> Ammonia Loading <br /> (2.251bs/d) f 2 <br /> ATNLRA 0.0141bS/ft2d = 161 t <br /> Design average ALBA is 0.01 lbs NH3-N/ft2. Use Equation 131 from Appendix B to determine the pounds per day of Average Day Ammonia <br /> Load,ALA: <br /> ALA,lbs/d= (40 mg/L) * (8.34 x 10-6 lbs•L/mg•gal) * (5,400 gpd) = 1.8 lbs/d <br /> Determine the textile area required based on Average Day Ammonia Load,AALRA using Equation 1.4: <br /> (1.81bs/d) f z <br /> AALRA 0.01 lbs/f t2 d — 180 t <br /> The treatment area associated with the Hydraulic Loading Rate is the most restrictive; therefore,the first stage AdvanTex area should be a <br /> minimum of 216 ft2. <br /> Treatment Unit Options— First Stage <br /> Option 1: Using AX-Max units—216 ft2 area <br /> AX-MAX225-35 (Max unit includes recirc-blend tankage and discharge tankage) <br /> Option 2:Using AX pod units —216 ft2 area <br /> (3)AX100, 8100-gallon recirc tank(recirculation-blend tank sized at minimum of 75%of QM per page 17 of Design Criteria) <br /> Loading Calculations—Second Stage <br /> For all second stage calculations,the values used are based on the predicted performance of the first stage system. Per page 25 of the design <br /> criteria,the Standard AdvanTex Stage treated effluent values for BODS and TKN are typically based upon 90% BODS removal, 95% nitrification, <br /> and 70% denitrification through Pre-Anoxic Stage and First-Stage AdvanTex Treatment. <br /> Organic Loading <br /> Design Average OLRA is 0.02 lbs BOD5/ft2•d (from page 15).Use Equation B5 in Appendix B to determine the value of First-Stage AdvanTex <br /> effluent BOD5e: <br /> BOD$, = 140 mg/L x(1 — 0.9) = 14 mg/L <br /> Determine the pounds per day of Average Day Organic Load, OLA using Equation B1 from Appendix B: <br /> OLA2 = (14 mg/L) * (8.34 x 10-6) * (5,400 gpd) = 0.32 lbs/d <br /> Determine the textile area required based on Average Day Organic Load,AOLRA using Equation 1.1: <br /> (0.32 lbs/d) z <br /> AOLRA 0.021bS/ft2d — 16 ft <br /> Orenco Systems®•800-348-9843•+1541-459-4449•www.orenco.com NDA-ATX-1 <br /> Rev.8,©10/20 <br /> Page 29 of 38 <br />