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n <br /> Nitrate Mass Balance Calculation <br /> Data Input: <br /> Effluent Quantity(Q): 911 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream(N,): 60.00 mg1L-N Denitrification (d): 10.0% <br /> Site Area (A): 14.32 Acres Deep Perc. of Rain (R): 11.68 <br /> Result: <br /> Mass Balance(N.): 4.6 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg1L-N Waste Loading (W): 0.86 in/yr <br /> Percent of MCL Nitrate as N 46% <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_�8'gal—I-year——43;560-ft21-ft---(f1)-acre..-_-,�-�,—�--�-----==�---._-- <br /> 0.86 in/yr(site) =911 gal/day x(1 cu-H17.48 gals)x(365 days/1 year)x(1 acre 143,560 sq-ft)x(12 in 11 ft)x(1 site 114.32 acres) <br /> N,= WN-0-d)+RNA, Hentzsche-Fennemore Equation(Nc) <br /> W+R <br /> 4.62 mg/L-N=((0.86 in/yr x 60 mg/L-N x(1-0.1))+(11.68 in/yr x 1mg1L-N))1(0.86 in/yr+11.68 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/l)of combined effluent and rainfall percolate(4-62 mg/L-N). <br /> W= Uniform waste water loading for study area(in/yr) (0.86 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate (60 mg/L-N). <br /> d= Fraction of nitrate-N loss due to denitrification in the soil(10%). <br /> R=Uniform deep percolation of rainfall (11.68 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 60 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 10%. <br /> 3. Estimated deep percolation of rainfall is 11.68 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> _. ��-•-.�-.ter=— <br /> I� <br /> 1 <br /> f <br /> NEIL O. ANDERSON <br /> AN D ASSOCIATES <br /> Plate 11 <br />