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Nitrate Mass Balance Calculation <br /> (Existing Residential Use) <br /> Data Input: <br /> Effluent Quantity(Q): 140 gals/day <br /> Effluent Stream(N„): 35.00 mgFL-N <br /> Site Area(A):TOO Acres <br /> Concentration Rain(Nb): 1.00 mg/L-N <br /> Denitrification(d):T5.0% <br /> Deep Perc.of Rain(R): 5.76 in/yr <br /> Result: <br /> Mass Balance(N,): 7.2 mg1L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 72% <br /> Waste Loading(W): 1.88 in yr <br /> Equations: <br /> Find <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 ft2 1 ft (A)acre <br /> 1.88 iNyr(sne)=140 galyday 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/1 acres) <br /> N�=WN 1( d)+RN„ <br /> N/+R Hantzsche-Fennemom Equation(Nc) <br /> 7.22 mg1L-N=((1.88 iNyr x 35 mg/L-N x(1-0.25))+(5.76 in/yr x 1mg/L-N))/(1.88 in/yr+5.76 irvyr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(7.22 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr)(1.88 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(5.76 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 5.76 in/yr,see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> 1 rerracon <br />