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I <br /> Nitrate ate Mass Balance Calculation <br /> F <br /> FData Input: <br /> Effluent Quantity(Q): 784 gals/day Concentration Rain(Nb): 1.00 mg/L-N <br /> Effluent Stream (N,,,): 60.00 mg/L-N Denitrification (d): 25.0% <br /> Al <br /> F, Site Area(A): 39.09 Acres Deep Perc. of Rain(R): 5.31 in/ r <br /> Result: <br /> i <br /> ss lance(N j: 3.1 -N <br /> F4 <br /> MCL Drinking Water Nitrate as N:.10.0 mg/L-N Waste Loading (W): 0.27 in/yr <br /> +�aN <br /> Percent of MCL Nitrat31 <br /> Equations: <br /> i <br /> i <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find <br /> K , <br /> yr day 7.48 gal 1 year 43,560 ft' 1 ft (A)acre <br /> 0.27 in/yr(site) =784 gal/day x(9 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 139.09 acres) <br /> FN,= WN,,,(1-d)+RN„ Hantzsche-Fennemore Equation Nc <br /> W+R <br /> 3.13 mg/L- =((0.27 in/yr x 60 mg/L-N x(1-0.25))+(5.31 in/yr x 1 mg/L-N))/(0.27 in/yr+5.31 in/yr) <br /> Variables: /,', 31 i <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate (3.13 mg/L-N). 1 Z' <br /> € W=Uniform waste water loading for study area (in/yr) (027 inches/year). �+ k <br /> E ' Nw=Total nitrate-N concentration of waste water percolate (60 mg/L-N). <br /> d = Fraction of nitrate-N loss due to denitrification in the soil (25%). <br /> R= Uniform deep percolation of rainfall (5.31 in/yr). <br /> F Nb=Background nitrate-N concentration of rainfall (1 mg/L-N). <br /> F, Assumptions: <br /> 1. Total nitrogen concentration of waste stream based on estimate of 60 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 5.31 in/yr,see deep per of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> t <br /> 1 <br /> F' <br /> F <br /> I! <br /> F11 it <br /> i <br /> I <br /> F ' <br /> NEIL O. ANDERSON <br /> F "44 AN D ASSOCIATES i <br /> i <br /> Plate 10 <br />