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Nitrate Mass Balance Calculation <br /> Data Input <br /> Waste Loading(W): 1.75 ir✓yr <br /> Site Area(A): 40.00 Acre <br /> Effluent Quantity(Q): 5209 Gals Concentration Rain(Nb): 1.00 mg2-N <br /> r Effluent Stream(Nw): 35.00 mg1L-N Denitrification(d): 25% <br /> Deep Perc.of Rain(R): 3.38 inches <br /> Result: <br /> Mass Balance(No): 9.6 mg/L-N <br /> r MCL Drinking Water Nitrate as N: 10.00 mg&-N <br /> Percent of MCL Nitrate as N 96% <br /> Equations: <br /> From Table 4 in Report: 5209 Gals Find Effluent Quantity(Q) <br /> r <br /> (W) in = (Q) gal x 1 ft' x 365 day x 1 acre x 12 in x 1 Find <br /> yr day 7.48 gal 1 year 43,568 ft 1 ft (A)acre <br /> r 1.75 fn/yr(site) =5,209 gaUday 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/40 acres) <br /> = WN...(1-d)+RN. Hantzsche-Fennemom E uafion <br /> W+R <br /> r 9.62 mg/L-N=((1.75 in/yr x 35 mg/L-N x(14.25))+(3.38 in/yr x 1 mgt-N))/(1.75 in/yr+3.38 ir✓yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(9.62 mg/L-N). <br /> r W=Uniform waste water loading for study area(inlyr)(1.75 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate(35 mg/L-N). <br /> d=Fraction of nitrate-N loss due to denitrification in the soil(25%). <br /> R=Uniform deep percolation of rainfall(3.38 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 35 mg/L-N. <br /> Assumption based on work from Crites, R.,Tchobanoglous,G.,1998. <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 3.38 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 /> r <br /> 0_ NEIL O.ANDERSON S ASSOC.,INC. <br /> mocm.s.s s....m aw...n ww.wes <br /> slpnla�aa <br /> Plate 9 <br />