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Nitrate Mass Balance Calculation <br /> (2-Persons) <br /> 5�yaSRKe-on► /otuI <br /> Data Input: <br /> Persons: aste Loading(W): 1.72 <br /> Gallons Per Person Per Day: 50.00 Site Area(A): 0.78 <br /> Effluent Quantity(Q): 100.00 Concentration Rain(Nb): 0.17 <br /> Effluent Stream(Nw): 45.00 Denitrification(d): 0.35 <br /> Deep Perc.of Rain(R): 6.84 <br /> Result: <br /> Mass Balance(Nc): 6.02 <br /> MCL Drinking Water Nitrate as N: 10.00 <br /> Percent of MCL Nitrate as N 0.60 <br /> Equations: <br /> 2 people x 50 gals/day/person = 100 gals/day Find Effluent Quantity(Q) <br /> (W) in = (Q) gal x 1 113 x 365 day x 1 acre x 12 in x 1 Find <br /> yr day 7.48 gal 1 year 43,560 ft2 1 It (A) <br /> 1 72 in/yr(site)=100 gal/day x(1 cu-ft/7 48 gals)x(365 days/1 year)x(1 acre 143,560 sq-ft)x(12 in/i ft)x(1 site/0.78 acres) <br /> N,:= WN-0-d)+RN Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 6 02 mg/L-N=((1 72 in/yr x 45 mg/L-N x(1-0.35))+(6.84 in/yr x 0.17mg/L-N))/(1.72 in/yr+6.84 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(6.02 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr)(1.72 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(35%). <br /> R=Uniform deep percolation of rainfall(6.84 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 35%. <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 0.17 mg/L-N based on range by <br /> Hantzsche and Fennemore, 1992. <br /> =pRRt f <br /> NEIL O.ANDERSON&ASSOC.,INC. <br /> - a<O1Ed NGAl 69iMQ8-BOIN�tMGIMOMTOPIB Z <br /> Zt Noustont.n.iod,cA OW O ~ <br /> (1EY)al 7. SSor <br /> FL/ATE 5 <br />