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'Nitrate Mass Balance Calculation <br /> r <br /> Data Input: <br /> Effluent Quantity(Q): 560 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream (N„,): 45.00 mg/L-N Denitrification (d): 25.0% <br /> Site Area (A): 2.00 Acres Deep Parc. of Rain (R): 5.76 in/yr <br /> Waste Loading (W): 3.76 in/yr <br /> Result: <br /> Mass Balance(Nj: 13.9 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 139% <br /> Equations: <br /> (W) in = (Q) .2gr x 1 It' x 365 x 1 acre x 12 in x 1 Find <br /> yr day 7.48 aaf 1 year 43,560 ft2 1 It (A)acre <br /> 3.76 in/yr(site) =560 gal/day x(1 cu-ft/7.48 gals)x(365 days/1 year)x (1 acre/43,560 sq-ft)x(12 in/1 ft)x(1 site/2 acres) t/ <br /> N,= WN,.,(1-d)+RN Hantzsche-Fennemore Equation (NO <br /> W+R <br /> 13.94 mg/L-N=((3.76 in/yr x 45 mg/L-N x(1-0.25))+(5.76 in/yr x lmg/L-N))/(3.76 in/yr+5.76 in/yr) <br /> Variables: lZy /� 9 J� <br /> y3 7 t, <br /> Nc=Average nitrate-N concentration(Mg4of combine5utand <br /> rainfall percolate(13.94 mg/L-N). <br /> W=Uniform waste water loading for study area (in/yr) (3.76 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(25%). <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 45 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 25%. <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 S S O C I A T E S <br /> Plate 10 <br />