Laserfiche WebLink
Nitrate Mass Balance Calculation_: <br /> Standard Septic System <br /> I Data Input: . <br /> Concentration Rain (Ne): 9.00 mg/L=N <br /> Effluent Quantity(Q):, 70.5gals/day Denitrification (d): 35.0% <br /> Effluent Stream(N,,): 45.0 mg/L-N Deep;Pert.of Rain (R): 1.07 in/yr <br /> Site Area(A): O.fi Acres Waste�Loacfing(Vii): 1.53 in/yr <br /> Result: <br /> Masa Balance(N j: 17.6 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10,0 mg/L-N <br /> ' Percent of MCL Nitrate as N 176% <br /> Equations: <br /> a <br /> (W) 'in (Q) gal z . 1A3 ,x 365 day x 1-acre x 12 in x Find <br /> yr day. • 7.48 gal 1 year 43,560 ftz . 1 ft (A) <br /> 1.53 in/yr(site)=71 gal/day x.(1 cu-g/7.48 gals)x(365 days/1 year)x(1 acre 143,560 sq-ft)'x(12 in/11)z f f sife/0.62'acres) <br /> N6= WN-(1-d)+RNa. Hantzsche-Fennemore Equation(W. . <br /> W+R. <br /> 1.7.62 mg/L-N=((1.53'in/yr x 45 mg/L-N x(1-0.35))+(1.07 in/yr'x 1mg/L-N))/(1.531n/yr+1.07 in%yr) <br /> Variables: <br /> { Nc=Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate(17.62 mg/L-N). <br /> W=`Uniform waste water loading for study area(inlyr)(1.53 inches/year)'. <br /> Nw,=Total nitrate-N concentration of wastewater 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 (1.07 in/yr). <br /> Nb=Background nitrate=N concentration'of rainfall (1.mg/L-N):. ; <br /> �. Assumptions: <br /> r 1. Total nitrogen concentration of waste stream based on estimate of 45 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-1.07 in/yr,see deep percolation of rain worksheet <br /> 4. Assume background nitrate-N concentration of rainfall.is 1 mg/L-N. . <br /> i <br /> NEIL O.'ANOERSON&ASSOC.,INC. s w <br /> GEOTEWINCALSilMCE6-ENGINEExNGL BORAT60ES Y <br /> ZS Mousba_Ln.Ladi,CA 132*_ R <br /> (264]367-DP7 1 d S Q G,T <br /> Plate 2 <br />