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Niftfe Mass Balance Calculation, ParCtf 1 <br /> Data Input: <br /> Effluent Quantity(Q): 147 galsrday Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream (Nj: 45.00 mg/L-N Denitrification (d): 25.0% <br /> .� Site Area (A): 10.51 Acres Deep Perc. of Rain (R): 3.30 in/yr <br /> Waste Loading (W): 0.19 in/yr <br /> Result: <br /> Mass Balance(Nj: 2.8 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 28% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find <br /> — <br /> yr day 7.48 gat 1 year 43,560 ft2 1 it (A)acre <br /> 0.19 in/yr(site) =147 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 R)x(1 site/10.51 acres) <br /> r, N,= WN,.,(1-d)+RN„ Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 2.77 mg/L-N=((0.19 in/yr x 45 mg/L-N x (1-0.25))+(3.3 in/yr x 1mg/L-N))/(0.19 in/yr+3.3 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate(2.77 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr) (0.19 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 (3.3 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 45 mg/L-N. <br /> .- 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 25%. <br /> 3. Estimated deep percolation of rainfall is 3.3 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> — <br /> "014 NEIL O. ANDERSON <br /> A N D A S S O C I A T E S <br /> y Plate 10 <br /> r <br />