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Design Criteruf 40, rencor <br /> Appendix 1 A: Example Design for an Apartment Complex (Application Type 1) <br /> AdvanTex Treatment for Removal of Organics and Ammonia With cBOD5,TSS, and NH3-N Discharge Limits <br /> Example: Forty-unit apartment complex consisting of twelve one-bedroom units and twenty-eight two-bedroom units.The system is to be dis- <br /> charged to a creek and permit requirements include organic and ammonia discharge limits. <br /> Establishing a Design Basis <br /> Flows <br /> List contributing sources,anticipated flows,and corresponding waste strengths <br /> Table 1A-1: Flows <br /> Source Max.Day Design Flow Per Unit(gpd) Max.Day Design Flow(gpd) Ave.Day Design Flow(gpd) <br /> 12 one-bedroom units 200 2,400 1,200 <br /> 28 two-bedroom units 300 8,400 4,200 <br /> Total 10,800' 5,400 <br /> 1 For Average Day Design Flow use 50%of Maximum Day Design Flow <br /> Discharge Type <br /> Stream discharge <br /> Influent(Primary Treated Effluent)and Permit Parameters <br /> Table 1A-2: Influent and Permit Parameters <br /> BODS TSS TKN NH3 N Alkalinity(mg/L) <br /> (mg/L) (mg/L) (Mg/0 (mg/L) <br /> Primary Treated Effluent(Ave/Max) 140/250 40/140 50/80 40/70 60 <br /> Discharge Permit Requirement(30-day Average) 20 20 N/A 1 summer/3 winter N/A <br /> Other Design Considerations <br /> Temperature effects <br /> Temperature impacts the performance of a treatment system.For systems with stringent nitrogen limits, it is important to ensure liquid and <br /> treatment system temperatures are maintained above minimum levels.AX-Max systems are constructed within insulated vessels and are <br /> preferred for cold environments,though AX100 with external insulation added in the field can also be utilized. <br /> Alkalinity needs <br /> Because ensuring that the pH remains above 7 (and preferably greater than 7.5)at all times is critical for ammonia-sensitive applications, <br /> alkalinity addition should be included if influent alkalinity is insufficient to buffer the process.Using Equation 3B from Appendix B,the alkalin- <br /> ity demand for this project is: <br /> Alkalinity Demand =80 mg/L TKN x 5 mg/G alkalinity — 400 mg/L <br /> 1 mg/L TKN <br /> Equation 134 from Appendix B: <br /> Alkalinity Need = 400 mg/L + 100 mg/L— 60 mg/L = 440 mg/G <br /> Equation 61A from Appendix B: <br /> Alkalinity Mass Load = (440 mg/L)x(8.34 x 10-6 lbs•L/mg•gal)x 5400 gpd = 19.8 lbs/d <br /> The equation shows that a minimum addition of 19.8 pounds of alkalinity per day is required for this system to accomplish 100% removal of <br /> TKN (assuming complete ammonification occurs). <br /> Orenco Systems°•800-348-9843•+1 541-459-4449•www.orenco.com NDA-ATX-1 <br /> Rev.8,©10/20 <br /> Page 27 of 38 <br />