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' 0 0 <br /> Nitrate Mass Balance Calculation: <br /> Treatment System Providing 5O% Removal of Total Nitrogen (Nw = 13 mg/L-N) <br /> 'Data Input: <br /> Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Quantity(Q): 7,083 gaWday Denitrification (d): 5.0% <br /> Effluent Stream (N j: 13.0 mg/L-N Deep Perc.of Rain (R): 5.01 irVyr <br /> Site Area (A): 14.0 Acres Waste Loading (W): 6.80 in/yr <br /> Result: <br /> Mass Balance(N j: 7.5 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 75% <br /> 'Equations: <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 gal 1 year 43,560 ft2 1 ft (A) <br /> ,6.8 inlyr(site)=7,083 gal/day 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/14 acres) <br /> N,= WN-(1-d)+RN„ Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 17.54 mg/L-N=((6.8 inlyr x 13 mg/L-N x(1-0.05))+(5.01 in/yr x 1 mg/L-N))/(6.8 inlyr+5.01 inlyr) <br /> Variables: <br /> 'Nc=Average nitrate-N concentration (mgA)of combined effluent and rainfall percolate(7.54 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr)(6.8 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate(13 mg/L-N). <br /> ,d=Fraction of nitrate-N loss due to denitrification in the soil (5%). <br /> R= Uniform deep percolation of rainfall (5.01 in/yr). <br /> Nb= Background nitrate-N concentration of rainfall (1 mg/L-N). <br /> Assumptions: <br /> 1. Total nitrogen concentration of waste stream based on estimate of 13 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 5%. <br /> 13. Estimated deep percolation of rainfall is 5.01 in/yr,see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> 1 <br /> P pERSO� <br /> NEIL O.ANDERSON&ASSOC.,INC. <br /> s <br /> �0RtlIHCAL 9E0.%CE8-EHGIXFERN4l.LB0R0T0PoEe Z W <br /> %Xausbn Ln.LaG1CA B32tl O A <br /> I3bI M].A% ♦ �� <br /> ' Plate 5 <br />