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t Nitrate Mass Balance Calculation <br /> ! <br /> II <br /> Data Input: <br /> Effluent Quantity(Q): 126 gals/day Concentration Rain (Nb): 1.00 mg1L-N <br /> { Effluent Stream (NW): 80.00 mglL-N Denitrification(d): 25.0% <br /> F; Site Area(A): 1.50 Acres Deep Perc. of Rain (R): 14.06 in/yr <br /> Result: <br /> Mass Balance(N j: 5.4 mg/L-N Waste Loading (W): '1.13 in/yr <br /> 4— MCL Drinking Water Nitrate as N: 10.0 mg1L-N <br /> Percent of MCL Nitrate as N 54% <br /> r+� <br /> i 1 Equations: <br /> (W) in = (Q) gal x 1 ft2 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 /> T 1.13 inlyr(site) =126 gal/day x(1 cu-ft 17.48 gals)x(365 days/1 year)x(1 acre/43,560 sq-ft)x(12 in/1 ft)x (1 site/1.5 acres) <br /> i <br /> N�= WNw(1-d)+RNt, Hantzsche-Fennemore Equation Ll c) <br /> '-' W+R <br /> 5.39 mg/L-N=((1.13 inlyr x 80 mg/L-N x(1-0.25))+ 14.056 in/ x 1mg/L-N))1(1.13 in +14.056 inlyr <br /> Variables: <br /> Nc=Average nitrate-N concentration (mgll)of combined effluent and rainfall percolate(5.39 mg/L-N). <br /> t W- Uniform waste water loading for study area(in/yr)(1.13 inches year) <br /> Nw=Total nitrate-N concentration of waste water percolate (80 mg/L-N). <br /> d= Fraction of nitrate-N loss dueto, tip 1 soil (25%). <br /> *�. R= Uniform deep percolation of rairifa 14.456 intyr). <br /> Nb= Background nitrate-N concentration o IL-N). <br /> Assumptions: <br /> 1. Total nitrogen concentration of waste stream based on estimate of 80 mg/L-N. <br /> F 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 14.056 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> F <br /> 7 <br /> I f <br /> { <br /> t <br /> ` Fi <br /> i <br /> '- NEIL O. ANDERSON <br /> A N D A S S 0 C I A T E S <br /> Plate 10 <br /> Fi <br />