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r•; I <br /> W � <br /> Nitrate Mass Balance Calculation <br /> Designated Remainder <br /> i1 <br /> Data Input: <br /> Effluent Quantity(Q): 350 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream (N,): 45.00 mg/L-N Denitrification (d): 35.0% <br /> Site Area(A): 5.00 Acres Deep Perc.of Rain (R): 6.00 in/yr <br /> Result: <br /> Mass Balance(Nr : 4.8 mg/L-N Waste Loading (W): 0.94 in/yr <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 48% <br /> I <br /> t Equations: <br /> 1 (W) in = (Q) gal x '1;1 ft3 x 365 day x 1 acre x 12 in x' 1 Find <br /> yr day 7.48 gal 1 year 43,560 ft2 1 ft (A)acre <br /> 0.94 in/yr(site) =350 gal/day x(1 cu-ft/7.48 gals)x(365 days/1 year)x(1 acre/43,560 sq-fl)x(12 in/1 ft)x(1 site/5 acres) f <br /> I� <br /> s, N,= WN-(1-d)+RN,, Hantzsche-Fennemore Equation(Nc) t <br /> ii W+R <br /> 4 4.83 mg/L-N=((0.94 in/yr',x 45 mg/L-N x(1-0.35))+(6 in/yr x 1mg/L-N))/(0.94 in/yr+6 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate (4.83 mg/L-N). <br /> FW=Uniform waste water loading for study area (in/yr)(0.94 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 (35%). <br /> R=Uniform deep percolation of rainfall (6 in/yr). <br /> 0 I <br /> Assumptions: , <br /> F, 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 35%. <br /> 3. Estimated deep percolation of rainfall is 6 inlyr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> �f I <br /> F � I <br /> NEIL O. ANDERSON <br /> A N D A S S O C I A T E S <br /> 4.' <br /> t <br /> II <br />