Laserfiche WebLink
Nitrate Mass Balance Calculation <br /> Data Input: <br /> Effluent Quantity(Q): 382 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream ft): 45.00 mg/L-N Denitrification(d): 25.0% <br /> Site Area (A) Deep Perc. of Rain(R): 6.84 in/yr <br /> Waste Loading(W): 1.06 in/yr <br /> Result: <br /> Mass Balance(Nj: 5.4 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 54% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find <br /> _ yr day 7.48 gal 1 year 43,560 fe 1 ft (A)acre <br /> 1.06 in/yr(site) =382 gal/day 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 14.84 acres) <br /> N,= WN-0-d)+RN„ Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 5.4 mg/L-N=((1.06 irVyr x 45 mg/L-N x(1-0.25))+(6.84 irvyr x 1 mg/L-N))/(1.06 in/yr+6.84 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(5.4 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr) (1.06 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 /> 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 /> — <br /> NEIL O. ANDERSON <br /> A N D A 5 5 0 C I A T E 5 <br /> r <br /> Plate 10 <br />