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{ Nitrate Mass Balance Calculation <br /> l <br /> p r <br /> [ f Data Input: <br /> / t <br /> Effluent Quantity(Q): 104 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> ii Effluent Stream (NH,): 85.00 mg/L-N Denitrification (d): 35.0% <br /> Site Area(A): 12.31 Acres Deep Perc.of Rain (R): 4.67 in/yr <br /> Result: <br /> Mass Balance(N,): 2.3 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N Waste Loading (VII): 0.11 in/yr <br /> Percent of MCL Nitrate as N 23% <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)acre <br /> 0.11 in/yr(site) =104 ga!/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/12.31 acres) <br /> t..' NG= WN,(1-d)+RNb Hantzsche-Fennemore Equation(Nd <br /> W+R <br /> 2.29 mg/L-N= ((0.11 in/yr x 85 mg/L-N x(1-0.35))+(4.67 in/yr x 1mg/L-N))/(0.11 in/yr+4.67 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/l)of combined effluent and rainfall percolate(2.29 mg/L-N). <br /> W= Uniform waste water loading for study area(in/yr) (0.11 incheslyear). <br /> Nw=Total nitrate-N concentration of waste water percolate(85 mg/L-N). <br /> d= Fraction of nitrate-N loss due to denitrification in the soil (35%). <br /> R= Uniform deep percolation of rainfall (4.67 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 85 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 35%. <br /> 3. Estimated deep percolation of rainfall is 4.67 in/yr, see deep percolation of rain worksheet. <br /> Fj <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> r <br /> E : <br /> �,a <br /> P <br /> A4NEIL O. ANDERSON <br /> A N D A S S O C I A T E S <br /> F, <br /> Plate 1 <br /> F1 <br />