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N <br /> Nitrate Mass Balance Calculation <br /> a <br /> Fit Data Input: <br /> Effluent Quantity(Q): 1,186 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream (NH,): 85.00 mg/L-N Denitrification (d): 35.0% <br /> Site Area(A): 4.97 Acres Deep Perc. of Rain (R): 4.67 in/yr <br /> ' Waste Loading(W): 3.21 in/yr <br /> Result, <br /> Mass Balance(N j: 23.1 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 231% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find <br /> f yr day 7.48 gal 1 year 43,560 ftz 1 ft (A)acre <br /> { r 3.21 in/yr(site) =1,186 gaUday x(1 cu-ft/7.48 gals)x(365 days/1 year)x(1 acre 143,560 sq-ft)x(12 in/1 ft)x(1 site 14.97 acres) <br /> r-+ N,= WNX-dt+RN,, Hantzsche-Fennemore Equation <br /> W+R <br /> 23.09 mg/L-N=((3.21 in/yr x 85 mg/L-N x(1-0.35))+(4.67 in/yr x 1 mg/L-N))/(3.21 in/yr+4.67 irVyr) <br /> Variables: U <br /> Nc=Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate(23.09 mg/L-N). <br /> t W=Uniform waste water loading for study area(in/yr) (3.21 inches/year). <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 /> PF 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> F <br /> F, <br /> + i <br /> l + <br /> i <br /> NEIL O. ANDERSON <br /> # A N D ASSOCIATES <br /> 1 <br /> Plate 10 <br /> y f x <br />