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Grencor Design Example PTE values of 80 mg/L TKN and 160 mg/L alkalinity in waste stream Target residual of 100 mg/L alkalinity Determine the amount of alkalinity required to buffer the treatment process Solving for Equation 133: Alkalinity Demand = 80 mg/L x 5 mg/L Alkalinity = 400 mg/L Alkalinity 1 mg/L TKN Now solving for Equation 134: Alkalinity Need = 400 mg/L + 100 mg/L- 160 mg/L = 340 mg/L Therefore the system will require supplemental alkalinity addition to buffer the treatment process. Anticipating Treatment Performance for Standard AdvanTex Stage Standard AdvanTex Stage treated effluent values for BODS,TKN,and NH3-N are typically based upon conservative estimates of 90% BODS removal (Coefficient of BOD Removal, CBR),95% nitrification (Coefficient of Nitrification, CNR)and 70%denitrification (Coefficient of Denitrifica- tion, CDNR).The calculations below assume pH values are maintained between 7 and 8.4 and the temperature of the liquid stream is maintained above 50°F(10°C)at all times. Equation B5 BODS, = BODS,x(1— CBR) Equation B6 TKN, = TKN;x(1 — CNR) Equation B7 NH,, = NH3i x (1— CNR) Equation B8 NO,, _ (TKN; — TKN,) x(1 — CoNR) Example PTE values of 225 mg/L BODS, 120 mg/L TKNj'and 100 mg/L NH3-N in waste stream Determine the value of BODS,and TKN,after the Standard AdvanTex Stage Solving for Equation 135: BOD$, = 225 mg/L x(1 — 0.90) = 22.5 mg/L Solving for Equation 136: TKN, = 120 x(1 — 0.95) = 6 mg/L Solving for Equation 137: NH,, = 100 mg/L x(1 — 0.95) = 5 mg/L Solving for Equation 138: NO,, = (120 — 6) x(1- 0.70) = 34.2 mg/L Therefore the estimated Total Nitrogen (TNe)value after the Standard AdvanTex Stage is: TN, = TKN, + NO3e = 6 mg/L +34.2 mg/L = 40.2 mg/L Orenco Systems®•800-348-9843•+1541-459-4449•www.orenco.com NDA-ATX-1 Rev.8,©10/20 Page 25 of 38