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In this example a laboratory test is simulated using diffusion and Freundlich non-linear sorption. The sample is a 7 cm thick clay with an impermeable base and a finite mass source of Phenol. The leachate source has an initial concentration (co) of 50 mg/L, and the physical height of the leachate in the reservoir above the soil was 6.5 cm. Parameters for the Freundlich isotherm were obtained experimentally from batch tests, these are Kf=2 and =0.628.
Following are the parameters used in this example:
Property |
Symbol |
Value |
Units |
Darcy Velocity |
va |
0 |
m/a |
Diffusion Coefficient |
D |
0.019 |
cm2/hr |
Sorption Coefficient |
Kf |
2 |
cm3/g |
Soil Porosity |
n |
0.46 |
- |
Dry Density |
|
1.47 |
g/cm3 |
Soil Layer Thickness |
H |
7 |
cm |
Number of Sub-layers |
|
14 |
- |
Source Concentration |
co |
50 |
mg/L |
Ref. Height of Leachate |
Hr |
6.5 |
cm |
When using non-linear sorption the accuracy of the solution is dependent on the number of sub-layers used.