Environmental Engineering Reference
In-Depth Information
Solution with specified concentration
of contaminant for adsorption test.
Air-dried soil, pulverized
to uniform powder
1 “blank,” other batches with varying
concentrations C
n
of contaminants
Batch
Soil solution
10 parts solution:1 part soil
C
1
C
2
testing
Blank
C
3
C
4
C
5
Adsorption isotherms
Analysis
Liquid-solids separation for
determination of concentration of
contaminants adsorbed by soil
particles
Equilibrium concentration
FIGURE 2.14
Batch equilibrium procedure for determination of adsorption isotherms. (From Yong, R.N. and Mulligan, C.N.,
Natural Attenuation of Contaminants in Soils
, CRC Press, Boca Raton, 310 pp., 2004.)
c
* =
k
3
c
1 +
k
4
c
k
n
and
m
are constants,
n
= 1 to 4
0
Equilibrium concentration of solutes in solution,
c
FIGURE 2.15
Freundlich, Langmuir, and Constant types of adsorption isotherms obtained from batch equilibrium tests.
c
,
Concentration of solutes or contaminants;
c
*, concentration of solutes or contaminants sorbed by soil fractions.
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