Two different column leaching tests are devised to evaluate the ability to remed

Question

Two different column leaching tests are devised to evaluate the ability to remediate a site where NAPL contamination has been found. The columns, shown in the figure are flushed with water to remove TCE, in solubilized form, from the contaminated zone. In each test, the initial free phase NAPL saturation is 10%, and it is present as an immobile phase. The permeability of the sand is k = 10-6 cnr2-The dynamic viscosity of water is = 1.12 x 10 3M s/mr2 and for the NAPL, 0.96 x 10-3Ns/rn2. The upper water level is held constant by an overflow tank and the effluent pressure is retained at atmospheric. The samples remain fluid saturated throughout the test with Sw+Sa Aqueous solubility of TCE is 1060 mg/1, density is 1500 kg/m, and the porosity, 30%.

Explanation / Answer

Sol:-

Overflow water level=1.00,

12.5cm
Immobile NAPL,25cm
12.5cm,20cm,5
Relative Permeability, k
r=10cm
Water NAPL,0.0

0,10 5cm
Effluent discharge
Effluent pressure recorded in
basal cell.1
100% Water Saturation, S

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