Description

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Description

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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.