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Nitrate Mass Balance Calculation <br /> Data Input: <br /> Effluent Quantity(Q): 1,086ga/s/day Concentration Rain (Nb): 1.00m9/L-N <br /> Effluent Stream (N,): 54.10 mg/L-N Denitrification (d): 100% <br /> Site AreaO A : 22.70 Acres <br /> Deep Aerc. of Rain (R): 5.76 in/yr <br /> Result: <br /> Waste Loading (W): a64in/yr <br /> Mass Balance(N,,): 5,8 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 58% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 da x 1 acre x 12 in x 1 Find W <br /> yr day 7.48 gal 1 year 43,560 ft' 1 ft (A)acre <br /> 0.64 in/yr(site)=1,086 gal/day x(1 cu-ft/7.48 gals)x(365 days/1 year)x(I acre/43 560q- x(1Z in/i ft)x(i site/22.7 acres) <br /> N,= WN 1-d +RN Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 5.79 mg/L-N=((0.64 in/yr x 54.1 mg/L-N x(1-0.1))-x(5.76 in/yr x Img/L-N))/(0.64 in/yr+5.76 m/yr) <br /> Variables: <br /> Nc = Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate(5.79 mg/L-N). <br /> W = Uniform waste water loading for study area (in/yr) (0.64 inches/year). <br /> Nw =Total nitrate-N concentration of waste water percolate (54.1 mg/L-N). <br /> d = Fraction of nitrate-N loss due to denitrification in the soil (10%). <br /> R = Uniform deep percolation of rainfall (5.76 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 54.1 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 10%. <br /> 3. Estimated deep percolation of rainfall is 5.76 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> NEIL O. ANDERSON <br /> A N D A 5 5 0 C I A T E S ` <br /> ,s <br /> Plate 7 <br /> F <br />