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E <br /> Nitrate Mass Balance Calculation <br /> r. <br /> Data Input: <br /> Effluent Quantity(Q): 428 gals/day Concentration Rain (Ne): 1.00 mg/L-N <br /> FEffluent Stream (N,,,): 60.00 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(N j: 15.7 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N Waste Loading (W): 4.88 in/yr <br /> Percent of MCL Nitrate as N 157% <br /> t Equations: <br /> t (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find <br /> t yr day 7.48 gal 1 year 43,560 ft2 1 ft (A)acre <br /> 4.88 in/yr(site) =428 gal/day 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/1.18 acres) <br /> '_. N,= WN-(1-d)+RN,, Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 15.72 mg/L-N=((4.88 in/yr x 60 mg/L-N x(1-0.15))+(11.69 in/yr x 1mg/L-N))/(4.88 in/yr+11.69 in/yr) <br /> r <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate(15.72 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr) (4.88 incheslyear). <br /> Nw=Total nitrate-N concentration of waste water percolate (60 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 60 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 rain worksheet.. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> F <br /> Ft <br /> F <br /> NEIL O. ANDERSON <br /> 'F, AN D ASSOCIATES <br /> Plate 9 <br /> R <br />