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Nitrate Mass Balance Calculation <br /> Data Input: <br /> Effluent Quantity(Qj: 917 galslday Concentration Rain (N,,): 9.00 mg/L-N <br /> Effluent Stream(N,,;)' 60.00 mg&-N Denitrification(d): 90.0% <br /> Site Area(A). 14.32 Acres Deep Pent.of Rain(R): inlyr <br /> Result: <br /> Nlass Balance(lNG): 4.6 mg/L4V <br /> MGL Drinking Water Nitrate as N: 90.0 mg/L-N Waste Loading(W): 0.86 inlyr <br /> Percent of MCL Nitrate as N 46% <br /> Equations: <br /> (W) in = (0) ,gal x ., x 85 da x 1 acre--- x 12 in_ x 1 EMM <br /> yr day 7.48 gal 1 year 43,560 fe 1 ft (A)acre <br /> 0.86 inlyr(efte)=911 gal/day x f ou-ft I7.48 gals)x(365 days/1 year)x(9 acre 143,560 sq-M x(12 in/911)x(1 sHe l 94.32 acres)' <br /> N, )+FtN�, Hanfzsche-F_eemane gau Mc <br /> W+R <br /> 4.62 mg&-N=((0.85 inlyr x 60 mg1L-)Vx(9-0.1))+(99.68 irr/yr x 9mg/L-N))O 86 Pnlyr+91.68 inlyr) <br /> Variables: <br /> No=Average nitrate-N conoentration(mgll)of combined effluent and rainfall percolate(1.62 mg/L-N). <br /> W=Unlform waste water loading for study area(inlyr)(0.86 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate(60 mg&-N). <br /> d=Fraction of nitrate-N Joss due to denitrification in the soil(10°A). <br /> R=Uniform deep percolation of rainfall(19.68 inlyr). i <br /> Nb-Background nitrate-N concentration of rainfall(9 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 soli is assumed to be 10%. <br /> 3. Estimated deep percolation of rainfall is 11.68 Inlyr,see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> f <br /> I <br /> 6 <br /> l <br /> NEIL 0, ANDERSON <br /> ANT? ASSOCIATES <br />