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Nitrate Mass Balance Calculation <br /> Input: <br /> From Table 2(Q): 2660 gpd <br /> Total Nitrogen Con.-Effluent Stream(Nw):45.00 mg/L-N <br /> Site Area(A): 3.48 Acre 725 gal <br /> Concentration Rain(Nb): 1.00 mg/L-N <br /> Denitrification(d): 30% <br /> Deep Perc.of Rain(R): 6.84 inches <br /> Result: <br /> Mass Balance(Nc): 19-31 mg/L-N V <br /> MCL Drinking Water Nitrate as N: 10.00 mg/L-N <br /> -. Percent of MCL Nitrate as N: 193% <br /> Waste Loading (W): 10.28 in/yr <br /> Equations: <br /> (W) in = (Q) gal x 1 fe x 365 day x 1 acre x 12 in x 1 Find <br /> yr day 7.48 gal 1 year 43,560 It 1 ft (A)acre <br /> 10.28 in/yr/site=2,660 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/3.48 acres) <br /> N�= WN-(1-d)+RK Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 19.31 mg/L-N=((10.28 in/yr x 45 mg/L-N x(1-0.3))+(6.84 in/yr x 1mg/L-N))/(10.28 in/yr+6.84 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(19.31 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr)(10.28 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate(45 mg/L-N). <br /> d=Fraction of nitrate-N loss due to denitrification in the soil(30%). <br /> R=Uniform deep percolation of rainfall(6.84 in/yr). <br /> Nb=Background nitrate-N concentration of rainfall(1 mg/L-N). <br /> Assumptions: <br /> 1. Nitrate-N concentration of waste stream based on estimate of 45 mg/L-N. <br /> Assumption based on work from Hantzsche and Finnemore, 1992. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 30%. <br /> Assumption based on work from Hantzsche and Finnemore, 1992. <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 based on range by <br /> Hantzsche and Fennemore, 1992. <br /> plll ypy <br /> NEIL O.ANDERSON&ASSOC.,INC. <br /> rf orecHHcni seances a^ LAB o�a <br /> rso� <br /> Plate 9 <br />