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Nitrate Mass Balance Calculation <br /> (12 employees and 10 customers) <br /> Data Input: <br /> Employee Occupancy: 12 people Waste Loading(W): 1.92 in/yr <br /> Gallons Per Day Per Person: 15 gpd/person Site Area(A): 1.15 Acre <br /> Customer Occupancy: 10 people Concentration Rain(Nb): 0.17 mg/L-N <br /> Gallons Per Day Per Person: 5 gpd/person Denitrification(d): 25% <br /> Constant(Ave.Daily Flow Adj.for Week): 0.71 Deep Perc.of Rain(R): 6.84 inches <br /> Ave.Daily Effluent Quantity Over 7 days(Q): 164 gpd <br /> Total Nitrogen Con -Effluent Stream(Nw): 45.00 mg/L-N <br /> Result: <br /> Mass Balance(No): 7.53 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.00 mg/L-N <br /> Percent of MCL Nitrate as N: 75% <br /> Equations: <br /> (12 people x 15 gals/day/person+10 people x 5 gals/day/person)x 0.71=164 gals/day Find Daily Effluent Quantity(Q) <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find <br /> yr day 7.48 qal 1 vear 43,560 ft' 1 ft (A)acre <br /> 1.92 in/yr/site=164 gal/day 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/1 15 acres) <br /> N,= WN-0-d)+RN„ Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 7.53 mg/L-N=((1.92 in/yr x 45 mg/L-N x(1-0.25))+(6.84 in/yr x 0.17mg/L-N))/(1.92 in/yr+6.84 intyr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/I)of combined effluent and rainfall percolate(7.53 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr)(1.92 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(6.84 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 25%. <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 /> NEIL O.ANDERSON 8 ASSOC.,INC. <br /> saba-sm �s ��• <br /> s <br /> PLATE 9 <br />