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Nitrate Mass Balance Calculation <br />5700 E. Nile Road, Manteca, CA <br /> <br /> <br /> <br />Data Input: <br /> <br /> <br /> <br /> <br />Result: <br /> <br /> <br />Effluent Quantity (Q): 6,378 gals/day Concentration Rain (Nb): 1.0 mg/L-N <br />Effluent Stream (Nw): 35 mg/L-N Denitrification (d): 35.0% <br />Site Area (A): 15.36 Acres Deep Perc. of Rain (R): 0.99 in/yr <br />Waste Loading (W): 5.58 in/yr <br />Mass Balance (Nc): 25.4 mg/L-N <br />MCL Drinking Water Nitrate as N: 10 mg/L-N <br />Percent of MCL Nitrate as N 254% <br /> <br />Equations: <br /> <br />(W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 <br /> <br /> yr day 7.48 gal 1 year 43,560 ft2 1 ft (A) acre <br /> <br /> <br />Find (W) <br />5.58 in/yr (site) = 6,378 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 / 15.36 acres) <br /> <br /> <br />Nc = WNw(1-d)+RNb <br />W+R <br />Hantzsche-Fennemore Equation (Nc) <br />25.4 mg/L-N = ((5.58 in/yr x 35 mg/L-N x (1-0.15))+(0.99 in/yr x 1mg/L-N))/(5.58 in/yr +0.99 in/yr ) <br /> <br />Variables: <br />Nc = Average nitrate-N concentration (mg/l) of combined effluent and rainfall percolate (25.4 mg/L-N). <br />W = Uniform waste water loading for study area (in/yr) (5.58 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 (15%). <br />R = Uniform deep percolation of rainfall (0.99 in/yr). <br />Nb = Background nitrate-N concentration of rainfall (1 mg/L-N). <br /> <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 15%. <br />3. Estimated deep percolation of rainfall is 0.99 in/yr, see deep percolation of rain worksheet. <br />4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />