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Fii <br /> r Nitrate Mass Balance Calculation <br /> Data Input: <br /> Effluent Quantity(Q): 210 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream (N,): 45.00 mg/L-N Denitrification (d): 15.0% <br /> Site Area (A): 0.26 Acres Deep Perc. of Rain (R): 11.69 in/ r <br /> Result: <br /> Mass Balance(N j: 18.9 mgJL-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N Waste Loading (W): 10.82 in/yr <br /> Percent of MCL Nitrate as N 189% <br /> Equations: <br /> (W) in = (Q) gal x 1 W x 365 day x 1 acre x 12 in x 1 Find <br /> yr day 7.48 gal 1 year 43,560 ft' 1 ft (A)acre <br /> 10.82 in/yr(site) =210 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 10.261 acres) <br /> i <br /> Nc= WN,,,(I-d,)+RN,, Hantzsche-Fennemore Equation(Nd <br /> W+R <br /> { <br /> 18.9 mg/L-N=((10.82 in/yr x 45 mg/L-N x(1-0.15))+(11.69 in/yr x 1mg/L-N))/(10.82 in/yr+11.69 in/yr) <br /> Variables: <br /> ;+ Nc=Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate(18.9 mg/L-N). <br /> . W= Uniform waste water loading for study area (in/yr) (10.82 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 (15%). <br /> ► R= Uniform deep percolation of rainfall (11.69 inlyr). <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 15%. <br /> 3. Estimated deep percolation of rainfall is 11.69 inlyr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> �r <br /> E, <br /> ' NEIL O. ANDERSON <br /> r <br /> AN D ASSOCIATES <br /> Plate 10 <br />