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Nitrate Mass Balance Calculation <br /> Data Input: <br /> Effluent Quantity(Q):1842 gals/day Concentration Rain(Nb): 1.00 mg/L-N <br /> Effluent Stream (N.,,):150.00 mg/L-N ✓ Denitrification (d): 25.0% <br /> Site Area(A):122.80 Acres Deep Perc. of Rain (R): 5.3101 r <br /> Result: — <br /> Massalance(NJ: 4.1 mg/L-N <br /> MCL Drinking Wate�PNRteteas Pl 10.8mglL-W� Waste Loading OM: 0.50 in/yr <br /> Percent of MCL Nitrate as N 41% <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 1year 43,560 ftz 1 ft (A) acre <br /> ,i3d 3�" <br /> 0.5 in/yr(site) =842 gat1day 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/22.8 acres) <br /> N,= WN_(l-d)+RNh Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 4.12 mg/L-N=((0.5 in/yr x 50 mg/L-N x(1-0.25))+(5.31 in/yr x lmg/L-N))/(0.5 in/yr+5.31 in/yr) - <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate(4.12 mg/L- <br /> W= Uniform waste water loading for study area (in/yr)(0.5 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate(50 mg/L-N). <br /> d = Fraction of nitrate-N loss due to denitrification in the soil (25%). <br /> R= Uniform deep percolation of rainfall (5.31 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 50 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 5.31 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> "04 NEIL O. ANDERSON <br /> AN D ASSOCIATES <br /> Plate 3 <br />