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Grenca,plesign <br /> Organic Loading—First Stage <br /> Since BODS is greater than TSS,the calculation for the most restrictive parameter(BODO is necessary. Design Average OLRA is 0.04 lbs <br /> BOD5/ft2•d (from page 15). <br /> Determine the pounds per day of Average Day Organic Load, OLA using Equation B1 A from Appendix B: <br /> OLA = (280 mg/L)*(8.34 x 10-6 lbs•L/mg•gal)*(10,500 gpd) = 24.5 lbs/d <br /> Determine the textile area required based on Average Day Organic Load,AOLRA using Equation 1.1: <br /> (24.51bs/d) f 2 <br /> AoceA — t <br /> 0.041bs/ft2d <br /> Hydraulic Loading—First Stage <br /> Design average HLRA is 25 gpd/ft2(from page 15). <br /> Determine the textile area required based on Average Day Hydraulic Load,AHLRA,using Equation 1.2: <br /> (10500 gal/d) <br /> f 2 <br /> ANLRA — 25 gal/ft2d = 420 t <br /> Total Nitrogen Loading Calculations—First Stage <br /> Design average TNLRA is 0.014 lbs TKN/ft2(from page 15). <br /> Determine the pounds per day of Average Day Nitrogen Load,TNLA,using Equation B1 from Appendix B: <br /> TNLA,lbs/d= (160 mg/L)*(8.34 x 10-6 lbs•L/mg•gal)*(10,500 gpd) = 14 lbs/d <br /> Determine the textile area required based on Average Day Nitrogen Load,ATNLRA,using Equation 1.3: <br /> (14lbs/d) f 2 <br /> ATNLRA 0.014lbs/ft2d — 1000 t <br /> The area associated with Total Nitrogen Loading Rate is the most restrictive and therefore the first stage AdvanTex area should be a minimum <br /> of 1000 ft2. <br /> Treatment Unit Options—First Stage <br /> Option 1:Using AX-Max units—1000 ft2 area <br /> (4)AX-MAX250-35; (1)T-MAX-14(AX-Max unit includes recirc-blend tankage and discharge tankage) <br /> Option 2:Using AX pod units—1000 ft2 area <br /> (10)AM 00,7875-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 the Pre-Anoxic Stage and first stage of AdvanTex Treatment Stage. <br /> Organic Loading—Second Stage <br /> Design Average OLRA is 0.02 lbs BOD5/ft2•d (from page 15).Use Equation B5 from Appendix B to determine the value of First-Stage <br /> AdvanTex effluent BOD5e: <br /> BODS, = 280 mg/L x(1 — 0.9) = 28 mg/L <br /> NDA-ATX-1 Orenco Systems®•800-348-9843•+1 541-459-4449•www.orenco.com <br /> Rev.8,©10/20 <br /> Page 36 of 38 <br />