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Grencor.pesign <br /> In a two-stage AdvanTex system,the treated effluent values from the Standard AdvanTex Stage (BOD5e,TKNe, and/or NH3.) are used to calculate <br /> the treatment area of the second stage AdvanTex unit. <br /> Anticipating Total Nitrogen Treatment Performance for Post Anoxic Stage <br /> For projects requiring 60-80%TN,TIN, or NO3-N reduction,the use of a post-anoxic stage for conversion of NO3-N to nitrogen gas(N2) is <br /> often the most cost-effective means.A CDNR of 0.7(70%) is used to anticipate the performance of the post-anoxic stage.These calculations <br /> assume pH values are maintained between 7 and 8.4 and the temperature of the liquid stream is maintained above 50° F <br /> (100 Q at all times. <br /> Equation B9 <br /> TN,,, = TKNe + NO3e x (1- CDNR) <br /> Example <br /> Using the example above,determine the value of TNe after the Post Anoxic Stage <br /> Solving for Equation 139: <br /> TNPAe = 6 mg/L + 34.2 mg/L x(1 — 0.70) = 16.3 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 26 of 38 <br />