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yy <br /> Nitrate Mass Balance Calculation <br /> Data Input: <br /> Waste Loading(W): 0.24 in/yr <br /> Site Area(A): 20.72 Acre <br /> Effluent Quantity(Q): 375 Gals Concentration Rain(Nb): 1.00 mg/L-N <br /> i Effluent Stream(Nw): 35.00 mglL-N Denitrification(d): 15% <br /> Deep Perc.of Rain(R): 6.84 inches <br /> Result: <br /> Mass Balance(Nc): 2.0 mgt-N <br /> MCL Drinking Water Nitrate as N: 10.00 mg/!.-N <br /> Percent of MCL Nitrate as N 15% <br /> Equations: <br /> From Table 4 in Report: 375 Gals _Find Effluent Quantlty_(Q) <br /> (W) in = (Q) gal x 1 W 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 /> 0.24 in/yr(site) X75 gal/day x(1 cu-ft/7.48 gals)x(365 days/1 year)x(1 acre/43,560 sq-R)x(12 in/1 ft)x(1 site/20.72 acres) <br /> N�= WN, l-d)+RK Hantzsche-Fennemore E uation Nc <br /> W+R <br /> 1.99 mg1L-N=((0.24 in/yr x 35 mg/L-N x(1-0.15))+(6.84 in/yr x lmg2-N))/(0.24 in/yr+6.84 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(1.99 mg/L-N). <br /> W=Uniform waste water loading for study area(inlyr)(0.24 incheslyear), <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(15%). <br /> R=Uniform deep percolation of rainfall(6.84 in/yr). <br /> Nb=Background nitrate-N concentration of rainfall(1 mg/L-N). <br /> Assumptions: <br /> 1 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 15%. <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 1 mg/L-N based on range by <br /> Hantzsche and Fennemore,1992. <br /> joEaro <br /> NEIL O.ANDERSON R ASSOC.,INC. <br /> s <br /> 3 lEogpNGAI SERriIFS-ENOINEEANO L/iBOAA TGNES L W <br /> RMwnlnn Ln.Lntl,C��eri O ti <br /> Fms:�.are7 �r <br /> sso� <br /> { <br /> I <br /> Plate 2 <br />