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Nitrate Mass Balance Calculation (Nw = 65 mg/L-N) <br /> i <br /> Data Input: <br /> Effluent Quantity(Q): 780 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream(NW): 65.00 mg/L-N Denitrification (d): 15.0% <br /> Site Area (A): 7.55 Acres Deep Perc. of Rain (R): 6.84 in/yr <br /> Waste Loading (W): 1.39 in/yr <br /> Result: <br /> Mass Balance(N�): 10.2 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 102% <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 1 year 43,560 ftz 1 ft (A)acre <br /> 1.39 in/yr(site) =780 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/7.55 acres) <br /> N,= WN-0-d)+13W Hantzsche-Fennemore Equation (Nc) <br /> W+R <br /> 10.16 mg/L-N= ((1.39 in/yr x 65 mg/L-N x (1-0.15))+(6.84 in/yr x 1mg/L-N))/(1.39 inlyr+6.84 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(10.16 mg/L-N). <br /> W= Uniform waste water loading for study area(in/yr) (1.39 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate(65 mg/L-N). <br /> d= Fraction of nitrate-N loss due to denitrification in the soil (15%). <br /> R=Uniform deep percolation of rainfall (6.84 inlyr). <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 65 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 6.84 in/yr, see deep percolation of rain worksheet. <br /> ` 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> C <br /> "0104 NEIL O: ANDERSON <br /> AN D ASSOCIATES <br /> plate 31 <br /> 4 <br />