Laserfiche WebLink
Nitrate Mass Balance Calculation <br /> Data Input: <br /> Effluent Quantity(QWmg/L-N <br /> Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream (NV, Denitrification (d): 25.0% <br /> Site Area (ADeep Perc. of Rain (R):15.31 in/yr <br /> t <br /> Result: � <br /> Wlass Balance(N j: 1.5 mg/L- --— <br /> MCL Drinking Wates itrate as N: 1 -N Waste Loading (W)(ff.07 intyr <br /> Percent of MCL Nitrate as N 15% _ <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 day z 1 acre x 12 in x 1 Find <br /> yr day 7.48 gal 1 year 43,560 ft2 1 ft (A)acre <br /> 0.07 in/yr(site) =547 gal/day x (1 cu-ft/7.48 gals)x(365 daysr 1 year)x(1 acre 143,560 sq-ft)x(12 in/1 ft)x(1 site/106.18 acres) <br /> N,= WN,.,(1-d)d)+RN, Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> . 75 F�k. <br /> 1.46 mg/L-N=((0.07 in/yr x 49 mg/L-N x(1-0.25))+(5.31 in/yr x lmg/L-N))/(0.07 intyr+5.31 in/yr) �`5 15%7 <br /> r <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate(1.46 mg/L-N)// <br /> W=Uniform waste water loading for study area (in/yr)(0.07 inches/year),; <br /> Nw=Total nitrate-N concentration of waste water percolate (49 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 /> ., 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 49 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 percolation of rain worksheet' <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/[--N.- <br /> NEIL O. ANDERSON <br /> AN D ASSOCIATES <br /> r. <br /> Plate 10 <br />