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Nitrate Mass Balance Calculation <br /> Data Input: <br /> Effluent Quantity (Q�._1,861 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream (N,H): 85.00 mg/L-N / Denitrification (d): 15.0% <br /> Site Area (A): 35.00 Acres Deep Perc. of Rain (R): 3.30 in/yr <br /> Waste Loading (W): 0.71 in/yr <br /> Result: <br /> Mass Balance(N�): 13.7 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 137% <br /> Equations: <br /> (W) in = (Q) yal x 1 ft3 x365 day x 1 acre x 12 in x 1 Find <br /> yr day 7.48 gal,,' 1 year f 43,560 ft2_, 1 ft (A) acre <br /> 0.71 in/yr(site) =1,861 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 135 acres) <br /> N,= WN-(1-d)+RN,, Hantzsche-Fennemore Equation (Nc) <br /> W+R <br /> 13.68 m /L-N=((0.71 in/yr x 85 mg/L-N x (1-0.15))+(3.3 in/yr x 1 mg/L-N))/(0.71 in/yr+3.3 in/yr) <br /> ,- les: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate(13.68 mg/L- ). <br /> W= Uniform waste water loading for study area (in/yr) (0.71 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate (85 mg/L-N). <br /> d = Fraction of nitrate-N loss due to denitrification in the soil (15%). <br /> R= Uniform deep percolation of rainfall (3.3 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 85 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 15%. <br /> 3. Estimated deep percolation of rainfall is 3.3 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 /> A N D A S S O C I A T E S <br /> Plate 10 <br />