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F!, <br /> r) <br /> Nitrate Mass Balance Calculation <br /> Data Input: <br /> Effluent Quantity(Q): 121 gaWday Concentration Rain (Nb): 1.00mg/L-N <br /> Effluent Stream (N,,): 45.00 mg1L-N Denitrification(d): 25.0% <br /> r Site Area(A): 19.93 Acres Deep Perc. of Rain(R): 6.84 inlyr <br /> Waste Loading (W): 0.08 inlyr <br /> Result: <br /> .. Mass Balance(N j: 1.4 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg1L-N <br /> F�! Percent of MCL Nitrate as N 14% <br /> Equations: <br /> (W) in = (Q) clal x 1 ft' x 365 day x 1 acre x 12 in x 1 Find <br /> ,yr day 7.48 gal 1 year 43,560.ft2 1 ft (A)acre <br /> 0.08 inlyr(site) =121 gallday x(1 cu-it/7.48 gals)x(365 days/1 year)x(1 acre/43,560 sq-ft)x(12 in/1 ft)x(1 site 119.93 acres) <br /> i <br /> Hantzsche-Fennemore Equation (Nc) <br /> W+R <br /> F 1.39 mg1L-N=((0.08 in/yr x 45 mg/L-N x(1-0.25))+(6.84 inlyr x lmg/L-N))1(0.08 in/yr+6.84 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate(1.39 mg/L-N). <br /> ri W= Uniform waste water loading for study area(in/yr)(0.08 incheslyear). <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 /> Fj' 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 /> F14. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> F <br /> F] <br /> n <br /> F <br /> NEIL O. ANDERSON <br /> F <br /> "04 AND ASSOC I A T E S <br /> Plate 10 <br /> Fj <br />