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. Nitrate Mass Balance Calculation <br /> I <br /> Data Input: <br /> i <br /> Effluent Quantity(Q): 478 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream (NH,): 54.20 mg/L-N Denitrification (d): 15.0% <br /> Site Area(A): 1.18 Acres Deep Perc. of Rain(R): 11.69 in/yr <br /> Result: <br /> Mass Balance(Nj: 15.3 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N Waste Loading (W): 5.43 in/yr <br /> Percent of MCL Nitrate as N 153% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find(00 <br /> yr day 7.48 gal 1 year 43,560 ft2 1 ft i(A)acre <br /> 5.43 in/yr(site) =478 gal/day x(1 cu-ft/7.48 gals)x(365 days`/year)x(1 acre/43,560 sq-ft)x(12 in/1 ft)x(1 site/1.184 acres) <br /> N -WN-(1-d)+RNF, Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 1' .295 mg&7N�-((5.43 r tyr x 54.2 mg/L-N x(1 0.15))+(11 69 in/yr x 1mg/L-N))/(5.43 in/yr+'19.69 rn/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate(15.29 mg/L-N). <br /> W= Uniform wastewater loading for study area (in/yr)(5.43 inches/year). <br /> I'k Nw=Total nitrate-N concentration of waste water percolate(54.2 mg/L-N)." <br /> d = Fraction of nitrate-N loss due to denitrification in the soil (15%). <br /> R= Uniform deep percolation of rainfall (11.69 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 54.2 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 11.69 in/yr, see deep percolation of rairi worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> I <br /> NEIL O. ANDERSON <br /> AN D ASSOCIATES <br /> Plate 9 <br />