Laserfiche WebLink
Table 4. <br /> Nitrate Mass Balance Calculation <br /> Speciality Coffee <br /> 24155 N. Hwy 99, Acampo, CA <br /> Input: <br /> From Table 2(Q): 450 gpd <br /> Total Nitrogen Con. -Effluent Stream(Nw): 45.00 mg/L-N <br /> Site Area (A): 3.48 Acre <br /> Concentration Rain(Nb): 1.00 mg/L-N <br /> Denitrification(d): 30% <br /> Deep Perc. of Rain(R): 6.84 inches <br /> Result: <br /> Mass Balance(Nc): 7.18 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.00 mg/L-N <br /> Percent of MCL Nitrate as N: 72% <br /> Waste Loading (W): 1.74 in/yr <br /> Equations: <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 2 1 ft (A)acre <br /> 1.74 in/yr/site =450 gal/day x(1 cu-ft/7.48 gals)x(365 days/1 year)x(1 acre 143,560 sq-ft)x(12 in/1 ft)x(1 site/3.48 acres) <br /> N,;= WN-(1-d)+RN,, Hantzsche-Fennemore Equation (Nc) <br /> W+R <br /> 7.18 mg/L-N=((1.74 in/yr x 45 mg/L-N x(1-0.3))+(6.84 in/yr x 1mg/L-N))/(1.74 in/yr+6.84 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(7.18 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr)(1.74 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 (30%). <br /> R=Uniform deep percolation of rainfall (6.84 in/yr). <br /> Nb=Background nitrate-N concentration of rainfall (1 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 30%. <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 1 mg/L-N based on range by <br /> Hantzsche and Fennemore, 1992. <br /> Neil O. Anderson and Associates <br /> January 26, 2004 <br />