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Nitrate Mass Balance Calculation, Phase 2 <br /> ` Data Input: <br /> Effluent Quantity (Q): 427 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream (Nj: 85.00 mg/L-N Denitrification (d): 25.0% <br /> Site Area (A): 8.58 Acres Deep Perc, of Rain (R): 4.67in/yr <br /> Waste Loading (W): 0.67 in/yr <br /> Result: <br /> Mass Balance(Nj: 8.9 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 89% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft' x 365 day x 1 acre x 12 in x 1 Find W <br /> yr day 7.48 gal 1 year 43,560 ftZ 1 ft (A)acre <br /> 0.67 in/yr(site) =427 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/8.58 acres) <br /> N,= WNw(1-d)+RN Hantzsche-Fennemore Equation (Nc) <br /> W+R <br /> -0 <br /> 8.86 mg 5/L-N= ((0.67 in/yr x 85 mg/L-N x(1-0.25))+(4.67 in/yr x lmg/L-N))/(0.67 in/yr+4.67 in/yr) <br /> Variables: <br /> Nc = Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate (8.86 mg/L-N). <br /> W = Uniform waste water loading for study area (in/yr) (0.67 inches/year). <br /> Nw =Total nitrate-N concentration of waste water percolate (85 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 85 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 /> NEIL O. ANDERSON <br /> AND ASSOC IATES <br /> Plate 11 <br />