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Nitrate Mass Balance Calculation"' <br /> Data input: <br /> Effluent Quantity(Q): 3,000 Gals Concentration Rain(Nb): 1.00 mg/L-N <br /> Effluent Stream(Nw): 10.00mg/L-N Denitrification(d): 10% <br /> Waste Loading(W): 2016 in/fir ?; Deep Perc, of Rain(R): 7.28 in/yr . <br /> Site Area(A): 0� acres ` <br /> Result: <br /> Mass Balance(Nc): 6.88 rrig/L-N . <br /> MCL Drinking Water Nitrate as N: 10.00 rng/L-N <br /> Percent of MCL Nitrate as N 0,69 mg/L-N , <br /> Equations: <br /> (W) in = (Q) gal 'x 1 ftp x 365 day x 1 acre x '12 in x 1 Find <br /> yr day 7.48 qal 1•year 43,560 ft2 1 ft (A)acre <br /> 20.16 in/yr(site) =3,000 gal/day x(1 cu-ft/7.48 gals)x(365 days/1 year.)x(1.acre/43,560 sq-ft):K(12 in/1 ft)x(1 site 12 acres) <br /> N,'= WNw(1-d)+RNr, 'Hantzsche-Fennemore Equation Nc <br /> W+R <br /> 6.88 mg/L-N=((20.16 in/yr x 10 mg/L-N x(1-0.1))+(7.28 in/yr x 1mg/L-N))/(20.16 in/yr+7.28 in/ Find Nc <br /> Variables: <br /> Ne=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate'(6.88 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr)(20. 6inches/year. 1 <br /> Nw=Total nitrate-N concentration of waste water percolate'(10 !fir L--N)• S� � <br /> d=Fraction of nitrate-N loss due to denitrification in the soil(10%). <br /> R=Uniform deep percolation of rainfall(7.28 inlyr), <br /> Nb=Background nitrate-N concentration of rainfall(1 ing/L-N), <br /> Assumptions: <br /> 1. Nitrate-N concentration of.waste stream based on estimate of 10 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 7.28 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 /> u <br /> �p€RiD <br /> r ti. <br /> NEIL O,ANDERSON&ASSOC.,INC. 1i <br /> �OIECNNCAL SERNCESE INMRNC LA"RATDMES <br /> 1.1-L.. CA SWQ <br /> . R0wi136T-NM r <br /> Plate 2 <br />