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0 <br /> Nitrate Mass Balance Calculation <br /> I< <br /> 1 <br /> F1 Data Input: <br /> Effluent Quantity(Q): 731 gals/day Concentration Rain (Nb): 0.17 mglL-N <br /> Effluent Stream(N,N): 45.00 mg/L-N Denitrification(d): 25.0% <br /> Waste Loading (W): 0.14 inlyr Deep Perc. of Rain (R): 7.86 inlyr <br /> Site Area(A): 69.6 Acres <br /> F!Result- <br /> Mass Balance(Nj: 0.8 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mglL-N <br /> Percent of MCL Nitrate as N 8% <br /> r Equations: <br /> 4 (W) 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 f? 1 ft (A) <br /> 10 141nlyr <br /> 0.141nlyr(site)=731 gai/day x(1 cu-ft 17.48 gals)x(365 days/1 year)x(1 acre/43,560 sq-ft)x(12 in/1 ft)x(1 site 169.59 acres) <br /> Ic.' <br /> Nr= WNW(1-d)+RNh Hantzsche-Fennemore Equation Nc <br /> W+R <br /> F-10,76 mg/L-N= ((0.14 inlyr x 45 mglL-N x(1-0.25))+(7.66 in/yr x 0.17mg1L-N))/(0.14 inlyr+7.86 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate(0,76 mg/L-N). <br /> W= Uniform waste water loading for study area(in/yr) (0.14 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 (25%). <br /> R= Uniform deep percolation of rainfall(7.86 in/yr). <br /> Nb= Background nitrate-N concentration of rainfall(0.17 mg/L-N). <br /> l ,Assumptions: <br /> l , 1. Nitrate-N concentration of waste stream based on estimate of 45 mg/L-N. <br /> Assumption based on work from Hantzsche and Finnemore, 1992. <br /> 02. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 25%. <br /> Assumption based on work from Hantzsche and Finnemore, 1992, <br /> 3. Estimated deep percolation of rainfall is 7.86 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 0.17 mg/L-N based on range by <br /> F! Hantzsche and Fennemore, 1992. <br /> +p1A <br /> NEIL O.ANDER80N&ASSOC.,INC. a <br /> W0M0HMCAL eENMGEB-EW NEERNG I,=ORATME; ¢ r <br /> n H—t-L,A,d1.GA OUN O R <br /> tpmy seTa7m s O CNr <br /> �j PLATS 9 <br />