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—Nitrate Mass Balance Calculation <br /> Data Input: <br /> Effluent Quantity(Q): 63 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream (N,,): 45.00 mg/L-N Denitrification (d): 15.0% <br /> Site Area(A): 8.00 Acres Deep Perc. of Rain (R): 4.67 inlyr <br /> Waste Loading(W): 0.11 in/yr <br /> Result: <br /> Mass Balance(Nj: 1.8 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 18% <br /> _ Equations: %u L ( ,off I 0.11 <br /> � <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 1-2i n x 1 Find <br /> yr day 7.48 gal 1 year 43,560 ftz 1 ft (A)acre <br /> 0.11 in/yr(site) =63 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 ft)x(1 site 18 acres) <br /> r, N�= WNJII-d)+RN., Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 1.83 mg/L-N=((0.11 in/yr x 45 mgt-N x(1-0.15))+(4.67 in/yr x 1 mg/L-N))/(0.11 in/yr+4.67 in/yr) <br /> Variables: � <br /> Nc=Average nitrate-N concentration(mgA)6f combine fFluent and raiffal("p'ercolate(1.83 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr) (0.11 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate(45 mg/L-N). <br /> d=Fraction of nitrate-N loss due to denitrification in the soil (15%). <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 45 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 15%. <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 /> NEIL O. ANDERSON <br /> A N D A S S O C I A T E 5 <br /> Plate 10 <br />