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Nitratc Mass Balance Calculation, 10 AG rJarcel <br /> Data Input: <br /> Effluent Quantity(Q): 490 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream(NW): 45.00 mg/L-N Denitrification(d): 25.0% <br /> Site Area(A): 10.00 Acres Deep Perc. of Rain (R): 4.67 in/yr <br /> Waste Loading (W): 0.66 in/yr <br /> Result: <br /> Mass Balance(N j: 5.0 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 50% <br /> Equations: <br /> ' (W) in = (Q) gal x 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 /> 0.66 in/yr(site) =490 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/10 acres) ✓ <br /> N,= WN-(1-d)+RN,, Hantzsche-Fennemore Equation(Nc <br /> W+R <br /> 5.05 mg/L-N=((0.66 in/yr x 45 mg/L-N x(1-0.25))+(4.67 in/yr x 1mgA--N))/(0.66 in/yr+4.67 in/yr) <br /> Variables: (Z2. 2a5- 4 <br /> Nc=Average nitrate-N concentration (mg/1)of combined effluent anrainfallpercolate(5.05 mg/L-N). <br /> W= Uniform waste water loading for study area(in/yr)(0.66 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 (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 25%. <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 /> "44 NEIL O. ANDERSON <br /> AN D ASSOCIATES <br /> Plate 11 <br />