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Nitrate Mass Balance Calculation <br /> Data Input: <br /> Waste Loading(W): 0.72 in/yr <br /> Site Area(A): 9.78 Acre <br /> Effluent Quantity(Q): 525 Gals Concentration Rain(Nb): 0.17 mg/L-N <br /> Effluent Stream(Nw): 45.00mg/L-N Denitrification(d): 10% <br /> Deep Perc.of Rain(R): 4.94 inches <br /> Result: <br /> Mass Balance(Nc): 5.31 mg1L-N <br /> MCL Drinking Water Nitrate as N: 10.00 mg/L-N <br /> Percent of MCL Nitrate as N 53% <br /> Equations: <br /> From Table 5 525 Gals/day Find Effluent Quantity(Q) <br /> (W) in = (Q) gal x 1 ft' x 365 day x t acre x 12 in x 1 Find <br /> yr day 7.48 gal 1 year 43,560 ft 1 ft (A) <br /> 0.72 inlyr(site)=525 gai/day x(1 cu-ff/7.48 gals)x(365 daysr 1 year)x(1 acre/43,560 sq-ff)x(12 in/f ft)x(1 site/9.78 acres) <br /> N�= WN,..(1-d)+RN,. Hantzsche-Fennemore Equation(NO <br /> W+R <br /> 5.31 mg/L-N=((0.72 in/yr x 45 mg/L-N x(1-0.1))+(4.94 in/yr x 0.17mg/L-N))/(0.72 inyr+4.94 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mgll)of combined effluent and rainfall percolate(5.31 mg/L-N). <br /> W=Uniform waste water loading for study area(intyr)(0.72 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(10%). <br /> R=Uniform deep percolation of rainfall(4.94 intyr). <br /> Nb=Background nitrate-N concentration of rainfall(0.17 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 10%. <br /> Assumption based on work from Hantzsche and Finnemore, 1992. <br /> 3. Estimated deep percolation of rainfall is 4.94 in/yr,see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 0.17 mg/L-N based on range by <br /> Hantzsche and Fennemore,1992. <br /> =oaaa <br /> s <br /> - NOL O.ANDERSON b ASSOC.,INC. - <br /> o=PcawcnavoEa-eox�xNvew.mnn <br /> II Pal».nn e�'�f UCS' <br /> Plate 9 <br />