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Nitrate Mass Balance Calculation <br /> 1 <br /> Data Input: <br /> E Quantity(Q): 305 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> uent Stream(N,w): 45.00 mg/L-N ✓ Denitrification (d): 25.0% <br />+I F Site Area(A): 1.58 Acres Deep Perc. of Rain(R): 6.84 inlyr <br /> I <br /> Waste Loading (W): 2.59 in/yr <br /> Result: <br /> PMass Balan a(N j: 10.0 mg/L-N �! <br /> MCL Drinking Water Nitrate 10.0 m L-N P <br /> Percent of MCL Nitrate as N 100% <br /> Equations: <br /> (W) in = (Q) gal x 1 0 x 365 daV x 1 acre x 12 in x 1 Find <br /> yr day 7.48 gal 1 year 43,560 ft 2 1 ft (A)acre <br /> 2.59 in/yr(site) =305 gal/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/1.58 acres) <br /> 1— <br /> Hantzsche-Fennemore Equation Nc) <br /> F. N,= WN-(1-d)+RN,, <br /> W+R <br /> 10.01 mg/L-N=((2.59 in/yr x 45 mg/L-N x(1-0.25))+(6.84 in/yr x 1 mg/L-N))/(2.59 in/yr+6.84 in/yr) <br /> I <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate(10.01 mg/L-N). <br /> W= Uniform waste water loading for study area(in/yr)(2.59 inches/year). <br /> € Nw=Total nitrate-N concentration of waste water percolate(45 mg/L-N). <br /> d =Fraction of nitrate-N loss due to denitrification in the soil (25%). <br /> ` R=Uniform deep percolation of rainfall (6.84 in/yr). <br /> Nb=Background nitrate-N concentration of rainfall (1 mg/L-N). <br /> Assumptions: <br /> a 1. Total nitrogen concentration of waste stream based on estimate of 45 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 6.84 in/yr,see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> ` t <br /> f <br /> I <br /> r F' <br /> i r <br /> 4 1 <br /> NEIL O. ANDERSON <br /> AN D ASSOC I A T E S <br /> f late 10 <br /> fl <br /> f <br />