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" Nitrate Mass Balance Calculation <br /> Data Input: <br /> Effluent Quantity(Q): 872 gals/day Concentration Rain (Nb): 1.00 mg1L-N <br /> Effluent Stream(NH,): •85.00 mg/L-N denitrification (d): 35.0% <br /> Site Area (A): 2.16 Acres Deep Perc. of Rain (R): 4.00 inlyr <br /> Waste Loading(W): 5.43 inlyr <br /> Result: <br /> Mass Balance(N,): 32.2 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0jmg1L-N <br /> Percent of MCL Nitrate as N 322% <br /> r <br /> 4 Equations: <br /> (VII) in = (Q) gal x 1 ft3 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 �� ,� � 3�� f�1 2) <br /> 5.43 in/yr(site)c"872�ga11day x(1 cu-ft l 7.48 gals)x(365 days/1 year)x(1 acre 143,560 sq-ft)x(I2 in l l R)x(1 site,l 2.16 acres) <br /> C', <br /> 33 Hantcsche-Fennemore E <br /> Nc= WNw(l-d)+Rcation Nc <br /> Nh <br /> W+R <br /> 32.23 mgA--N=((5.43 inlyr x 85 mgA--N x(1-0.35))+(4 inlyr x 1mg1L-N))/(5.43 inlyr+4 inlyr) <br /> f Variables: <br /> ! Nc=Average nitrate-N concentration (mgA)of combined effluent and rainfall percolate(32.23 mg/L-N). <br /> r W=Uniform waste water loading for study area(inlyr) (5.43 inches/year). <br /> i Nw=Total nitrate-N concentration of waste water percolate(85 mg/L-N). <br /> I d=Fraction of nitrate-N loss due to denitrification in the soil (35%). <br /> R=Uniform deep percolation of rainfall(4 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 85 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 35%. <br /> 3. Estimated deep percolation of rainfall is 4 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> E <br /> i <br /> w <br /> NEIL O. ANDERSON <br /> AND ASSOC IATES <br /> Plate 2 <br /> t <br />