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Nitrate Mass Balance Calculation <br /> Data Input: <br /> Effluent Quantity(Q): 130 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream (N,): 35.00 mg/L-N Denitrification (d): 25.0% <br /> Site Area (A): 1.43 Acres Deep Perc. of Rain (R): 5.01 in/yr <br /> Waste Loading (W): 1.22 in/yr <br /> Result: <br /> Mass Balance(Nj: 6.0 mg/L-N <br /> MCL Drinking Water Nitrate as Ni 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 60% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find W <br /> yr day 7.48 gal 1 year 43,560 ft 1 ft (A)acre <br /> 1.22 in/yr(site) =130 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/1.43 acres) <br /> N,= WN„(1-d)+RN,, Hantzsche-Fennemore Equation(Nd <br /> W+R <br /> 5.95 mg/L-N= ((1.22 in/yr x 35 mg/L-N x (1-0.25))+(5.01 in/yr x 1mg/L-N))/(1.22 in/yr+5.01 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate(5.95 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr) (1.22 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate(35 mg/L-N). <br /> d= Fraction of nitrate-N loss due to denitrification in the soil (25%). <br /> R= Uniform deep percolation of rainfall (5.01 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 35 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 5.01 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 /> AN D ASSOCIATES <br /> Plate 9 <br />