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-- Nitrate Mass Balance Caiculatdcirr- <br /> rata Input: <br /> Effluent Quantity(Q): 272 gala/day Concentration Rain(Nb): 1.00 mg/L-N <br /> Effluent Stream(N.). 65.00 mg/L-N Denitrification (d): 30.0% <br /> Site Area(A): 3.50 Acres Deep Perc. of Rain (R): 5.76 in/yr <br /> Result: <br /> Mass Balance(dot,): 7.8 mg/L-N Waste Loading(W): 1.04 in/yr <br /> MCL Drinking Water Nitrate as N. 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 78% <br /> Equations: <br /> (W) in = (Q) gal x 1 W x 365 do V x 1 acre x 12 In x 1 Fmpw <br /> yr day 7.48 gal 1 year 43,560 ft' 1 ft (A) acre <br /> 1.04 in/yr(site)=272 gat/day x(1 cu-ft/7.48 gals)x(365 daysi 1 year)x(1 acre/43.560 sq-It)x(12 in/1 R)x(1 site/3.5 acres) <br /> N�= V -d, RN, Hantzsche-Fennemone Eguation(Nc) <br /> W+R <br /> 7.83 mg/L-N=((1.04 in/yr x 65 mg/L-N x (1-0.3))+(5.76 intyr x 1mg/L-A1))/(1.04 intyr+5.76 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/I)of combined effluent and rainfall percolate(7.83 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr) (1.04 inches/year) <br /> Nw=Total nitrate-N concentration of waste water percolate(65 mg/L-N). <br /> d= Fraction of nitrate-N loss due to denitrification in the soil (30%). <br /> R=Uniform deep percolation of rainfall (5.76 in/yr)- <br /> 0 <br /> Assumptions: <br /> 1. Total nitrogen concentration of waste stream based on estimate of 65 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 30%. <br /> 3. Estimated deep percolation of rainfall is 5.76 in/yr. see deep percolation of rain worksheet. <br /> 4, Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> NEIL O. ANDERSON <br /> AND ASSOC IATSS <br /> Plate 10 <br />