Laserfiche WebLink
Nitrate Mass Balance Calculation <br /> (8-People, add Second Dwelling Unit) <br /> Data Input: <br /> Occupancy: 8 people Waste Loading(W): 6.89 in/yr <br /> Gallons Per Person Per Day: 50 gpd/person Site Area(A): 0.78 Acre <br /> Effluent Quantity(Q): 400 Gals Concentration Rain(Nb): 0.17 mg/L-N <br /> Effluent Stream(Nw): 45.00 mg/L-N Denitrification(d): 35% <br /> Deep Perc.of Rain(R): 6.84 inches <br /> Result: <br /> Mass Balance(Nc): 14.77 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.00 mg/L-N <br /> Percent of MCL Nitrate as N 148% <br /> Equations: <br /> 8 people x 50 gals/day/person =400 gals/day Find Effluent Quantity(_Q) <br /> (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 ft' 1 ft (A) <br /> 6.89 in/yr(site) =400 gat/day x(1 cu-ft/7.48 gals)x(365 days/1 year)x(1 acre/43,560 sq-ft)x(12 in/1 ft)x(1 site/0.78 acres) <br /> N,= WN„X1-d)+RN, Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 14.77 mg/L-N=((6.89 in/yr x 45 mg/L-N x(1-0.35))+(6.84 in/yr x 0.17mg/L-N))/(6.89 in/yr+6.84 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(14.77 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr)(6.89 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(35%). <br /> R=Uniform deep percolation of rainfall(6.84 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, 1992. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 35%. <br /> Assumption based on work from Hantzsche and Finnemore, 1992. <br /> 3- Estimated deep percolation of rainfall is 6.84 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 /> Hantzsche and Fennemore, 1992. <br /> NEIL O.ANDERSON E ASSOC.,INC. <br /> ¢o.EwMCK smvcE s.Fmiwecxrc ueovwTowFs <br /> ami s.-aa <br /> Soo <br /> PLATE 1 <br />