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GrenCOr <br /> Design , <br /> Design Specifics <br /> Tankage Requirements <br /> Primary tankage for apartment complexes is usually provided as either a single primary tank or through the use of several distributed primary <br /> tanks(locating smaller tanks next to each apartment block). If distributed primary tanks are used, pumps may be required if the treatment facility <br /> is located at an elevation higher than the primary tanks. <br /> Apartment complexes fall within Application Type 1 in Appendix A; therefore total primary tank recommendations call for a minimum of 2 days' <br /> retention at maximum day design flow.Since a pre-anoxic tank is required and will be situated at the treatment site, provide a minimum of 1 day <br /> retention in primary and 1 day retention in pre-anoxic. <br /> Table 1A-3:Sample Tank Sizing Recommendations <br /> Tank Sizing Max.Day Design Flow(gpd) Recommended Minimum Primary Tank Size(Gallons) <br /> Primary Tank 10,800 10,800—use 12,000 <br /> Pre-Anoxic Tank 10,800 10,800—use 12,000 <br /> A two-stage AdvanTex is required for ammonia removal.The configuration is as follows (see page 11): <br /> Alkalinity Feed <br /> Pre-Anoxic Return Line <br /> Primary Pre-Anoxic 1st Stage 2nd Stage Discharge <br /> Treatment AdvanTex AdvanTex <br /> Figure 1A-1.Configuration for Ammonia Removal <br /> Loading Calculations—First Stage <br /> For all first stage calculations,the design maximum day loading rates are double the average day design loading rates.Since the design maximum <br /> day flow is not greater than two times the average day design flow,the calculation for maximum day design load is unnecessary. <br /> Organic Loading <br /> Since BODS is greater than TSS,the calculation for the most restrictive parameter(BODS) is necessary. Design Average OLRA is 0.04 lbs <br /> BOD5/ft2•d. (See Standard AdvanTex Stage Sizing, Design Criteria page 15).Use Equation 1311 from Appendix B to determine the pounds per <br /> OLA = (140 mg/L) * (8.34 x 10-6 lbs•L/mg•gal) * (5,400 gpd) = 6.31 lbs/d <br /> day of Average Day Organic Load, OLA: <br /> (6.31 lbs/d) z <br /> AoLxA = 0.041bs/ftzd — 158 f t <br /> Determine the textile area required based on Average Day Organic Load,AOLRA using Equation 1.1: <br /> Hydraulic Loading <br /> Design average HLRA is 25 gpd/ft2.((See Standard AdvanTex Stage Sizing,Design Criteria page 15). Use Equation 1.2 to determine the textile <br /> area required based on Average Day Hydraulic Load: <br /> (5400 gpd) f z <br /> A"`RA — 216t— 25 gal <br /> NDA-ATX-1 Orenco Systems®•800-348-9843•+1 541-459-4449•www.orenco.com <br /> Rev.8,©10/20 <br /> Page 28 of 38 <br />