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Nitrate Mass Balance Calculation <br /> Data Input: <br /> People: 8 <br /> Use Rate: 75 gaWday/person <br /> Daily Average Effluent Quantity(Q):600 gals/day <br /> Effluent Stream(N.):45 mg1L-N <br /> Waste Loading(W): 0.81 in/yr <br /> Site Area(A): 10.OAcres <br /> Concentration Rain(Ne):a 17 mg/L-N <br /> Denitrification(d):25.0% <br /> Deep Perc.of Rain(R):212 in/yr <br /> Result: <br /> Mass Balance(N.): 9.4 mg1L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 94% <br /> Equations: <br /> (Q)=(People x Use Rate) Fin <br /> 600 gaialday=(8 people x 75 gals/day/person) <br /> (W) in = (Q) ggl x ' x 365 day x 1 acre x 12�i _ x Z Find IM <br /> Yr day 7.48 gal 1 year 43,560 f 1 ft (A) <br /> a81 in/yr(site)=600 gaUday x(1 cu-Jt/7.48 gals)x(365 days/1 year)x(1 acre/43,560 sq-ft)x(12 in/1 R)x(1 site/10 acres) <br /> N,= WNl1-dI+R& Hantzsche-Fennemom Eauation(Nc) <br /> W+R <br /> 9.42 mgt-N=((0.81 in/yr x 45 mg/L-N x(1-025))+(212 in/yr x 0.17mgt-N))/(0.81 iNyr+2.12 iNyr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(9.42 mg/L-N). <br /> W=Uniform waste water loading for study area(inlyr)(0.81 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(25%). <br /> R=Uniform deep percolation of rainfall(2.12 in/yr). <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 25%. <br /> Assumption based on work from Hantzsche and Finnemore,1992. <br /> 3. Estimated deep percolation of rainfall is 2.12 iNyr,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 /> + + <br /> NEIL O.ANDERSON d ASSOC.,INC. <br /> '�voEa..o.Axa sw.. ,,:i»ir na <br /> Plate 2 <br />