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Nitrate Mass Balance Calculation <br /> Data Input: <br /> Effluent Quantity(Q): 842 gals7day Concentration Rain (Nb): 0.17 mg1L-N <br /> Effluent Stream(N„,): 45.00 mg/L-N Denitrification (d): 25.0% <br /> Waste Loading(W): 0.50 in7yr Deep Perc. of Rain(R): 6.80 in/yr <br /> r Site Area (AC): 22.8 Acres <br /> Result: <br /> Mass Balance(N j: 2.5 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 25% <br /> Equations: <br /> r <br /> (lr(Jite)=(LJ Ix IJP 365 IAC 12in lJ(re <br /> x-_X- .x-x <br /> Yr day 7.489al Year 43560ft l jt Acmj(AC) <br /> r Find <br /> 0.5 inlyr(site) =842 gaUday x(1 cu-ft/7.48 gals)x(365 days/1 year)x(1 acre 143,560 sq-ft)x(12 in/1 ft)x(1 site 722.8 acres) <br /> Ne <br /> >_ WN.(1 - d)+RNb <br /> Hantzsche-Fennemore Equation fNc) <br /> W+ R <br /> _ 2.45 mg/L-N=((0.5 in/yr x 45 mg/L-N x(1-0.25))+(6.8 in/yr x 0.17m9/L-N))/(0.5 in/yr+6.8 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/I)of combined effluent and rainfall percolate(2.45 mg/L-N). <br /> W=Uniform waste water loading for study area (in/yr)(0.5 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 (6.8 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 6.8 in/yr, see deep percolation of rain, Plate 8 <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 /> DE RJ 1 <br /> NEIL O.ANDERSON 8 AS SOC.,INC./. <br /> �o�w�ca snuwz.eroweae o vn , 7.s <br /> a <br /> Pml.n..nn 1 rY <br /> '�J O C� <br /> PLATE 9 <br />