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Nitrate Mass Balance Calculation <br /> Data Input: <br /> Effluent Quantity(Q): 23 gals1day �/ Concentration Rain(Nb): 1.00 mg/L-N <br /> Effluent Stream (Nw): 55.00 mg1L-N y Denitrification (d): 25.0% -X-1, <br /> Site Area(A): 8.20 Acres ✓ Deep Perc. of Rain (R): 5.87 in/yr <br /> Waste Loading (W): 0.04 in/yr <br /> Result: <br /> Mass Balance(N,): 1.3 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10-0 mg1L-N <br /> Percent of MCL Nitrate as N 13% <br /> Equations. <br /> 3 fx a ---_. <br /> (W) in = (Q) gft gal x 1 x 365 da-u ;x 1 acre ,x 12 in x 1 Find <br /> yr day `7.48 gal 1 year '•, J 43,560 ft2'/1 1 ft (A) acre „ <br /> 0.04 in/yr(site) =23 gallda y x (1 cu-ft/7.48 gals)-x-(365-days/1 year)x(1 acre 143,560 sq-R)x(12 in 11 ft)x(1 site 18,2 acres) <br /> _.Nc= WNw(1-d)+RN,, Hantzsche-Finnemore Equation(Nc) <br /> W+R <br /> 1.26 mg/L-N= ((0.04 in/yr x 55 mg1L-N x - 5))+(5.87 in/yr x 1 mg1L-N))1(0.04 in/yr+5.87 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate(1.26 mgIL=N). <br /> W'= Uniform waste water loading for study area (in/yr) (0.04 inches/Year). <br /> Nw=Total nitrate-N concentration of waste water percolate(55 mg/,L-N), <br /> d = Fraction of nitrate-N loss due to denitrification in the soil (25%)! <br /> R Uniform deep percolation of rainfall (6-87 knlyr). <br /> Nb=Background nitrate-N concentration o rainfall (1 mg/L-N). <br /> Assumptions: <br /> 1. Total nitrogen concentration of waste stream based on estimate of 55 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 5.87 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> I NEIL O. ANDERSON <br /> A N D A S S O C I A T E S <br /> Plate 2 <br />