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Titrate Mass Balance Calculation <br /> Standard Septic System <br /> Data Input: <br /> Students/Facality: 740 people Waste Loading (W): 10.57 in/yr <br /> _ Student/staff:Gal lons/person/day: 15 gals/day Site Area (A): 10.2 Acres <br /> Concentration Rain (NJ 0.17 mg/L-N <br /> Denitrification (d): 25.0% <br /> Use Constant, 5 days/7days: 0.714 Deep Perc. of Rain (R): 7.86 in <br /> Effluent Quantity (Q): 8,000 gals/day <br /> Effluent Stream (N,): 45.00 mg/L-N <br /> Result: <br /> Mass Balance (N j: 19.43 mg/L-N <br /> MCI-Drinking Water: 10. mg/L-N <br /> Percent of Maximum <br /> Drinking Water Standard: 194% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 <br /> yr day 7.48 gal 1 year 43,560 ft2 1 ft (A) acres <br /> N, = WN-(1-d)+RN <br /> W+R <br /> Variables: <br /> Nc= Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate (19.43 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr) (10.57 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 /> Assumptions: <br /> 1. Nitrate-N concentration of waste stream based on estimate of 45 mg/L-N. <br /> Assumption based on work from Hantzsche and Finnemore, 1991. <br /> 2. 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, 1991. <br /> - 3. Estimated deep percolation of rainfall is 7.86 in/yr, see Worksheet No. 1. <br /> 4. Assume background nitrate-N concentration of rainfall is 0.17 mg/L-N based on range by <br /> Hantzsche and Fennemore, 1991. <br /> 9 so+ <br /> NEIL O.ANDERSON&ASSOC.,INC. N <br /> OEOTECHNCAL SERVICES-ENGINEERNG LABORATORIES Z W <br /> 22 House nLn.Lodi,CA 95240 O ` <br /> (209)387-3701 7 �♦ <br /> 'sSO� <br /> PLATE 9 <br />