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Nitrate Mass Balance Calculation" <br /> Data Input: <br /> Effluent Quantity(Q):1321 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream (N,,):185.00 mg/L-N Denitrification (d): 35.0% <br /> Site Area (A):15.00 Acres Deep Perc. of Rain (R): 4.67 in/ r <br /> Result: <br /> Mass Balance(Nj: 9.5 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N Waste Loading(W): 0.86 in/yr <br /> Percent of MCL Nitrate as N 95% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find <br /> .� /' yr day 7.48 gal 1 year 43,560 flz 1 ft (A) acre <br /> / 0)) 4r("site) =321 gal/day x(1 cu-ft/7.48 gals)x(365 days/1 year)x(1 acre 143,560 sq-ft)x(12 in/1 R)x(1 site/5 acres) <br /> •— N�= WN...(1-d)+RN„ Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 33- i �}' <br /> 9.46 mg/L-N=((0.86 in/yr x 85 mg/L-N x (1-0.35))+(4.67 in/yr x 1 mg/L-N))/(0.86 in/yr+4.�7 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/I) of combined effluent and rainfall percolate(9.46 mg/L-N). <br /> _ W=Uniform waste water loading for study area(in/yr) (0.86 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate (85 mg/L-N). <br /> d= Fraction of nitrate-N loss due to denitrification in the soil (35%). <br /> R=Uniform deep percolation of rainfall (4.67 in/yr). <br /> —. Nb= Background nitrate-N concentration of rainfall (1 mg/L-N). <br /> Assumptions: <br /> 1. Total nitrogen concentration of waste stream based on estimate of 85 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 35%. <br /> 3. Estimated deep percolation of rainfall is 4.67 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> r <br /> .. NEIL O. ANDERSON <br /> A N D A S S O C I A T E S <br /> Plate 9 <br />