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• <br /> I � <br /> Nitrate Mass Balance Calculation <br /> (Existing Residential Use) <br /> Data Input: <br /> Effluent Quantity(Q): 280 gals/day <br /> Effluent Stream(N,,,): 35.00 mg/L-N <br /> Site Area(A): 10.00 Acres <br /> Concentration Rain(Nb): 1.00 mg/L-N <br /> Denitrification(d): 15.0% <br /> Deep Perc.of Rain(R): 2.86 in/yr <br /> Result: <br /> Mass Balance(N j: 4.3 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 43% <br /> Waste Loading(W): 0.38 in/yr <br /> Equations: <br /> Find W <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 <br /> yr day 7.48 gal 1 year 43,560 ftz 1 ft (A)acre <br /> 0.38 in/yr(site)=280 gaUday 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 sde/10 acres) <br /> Nc= W N,., 1-d +RN <br /> W+R - Hantzsche-Fennemore Equation(Nc) <br /> 4.34 mg/L-N=((0.38 in/yr x 35 mg/L-N x(1-0.15))+(2.86 in/yr x 1mg/L-N))/(0.38 in/yr+2.86 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(4.34 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr)(0.38 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(2.86 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 15%. <br /> 3. Estimated deep percolation of rainfall is 2.86 in/yr,see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> Irerracon <br />