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1.0
α = 2
1
0.8
0
0.6
0.5
0.4
0.2
0
0
1
2
3
4
5
6
7
8 9 0
V/V
o
FIGURE 8.11
Effluent concentration distributions for different values of the dimensionless mass transfer
parameter (α) of the SOMIM model. (From H. M. Selim and M. C. Amacher. 1997.
Reactivity and
Transport of Heavy Metals in Soils
. Boca Raton, FL: CRC Press. With permission.)
have somewhat similar behavior in soils, one can assume that diffusion coef-
ficients for chromate would be equivalent to those for phosphate. These val-
ues of
D
a
and
a
were also used to estimate the hydrodynamic dispersion
coefficient (
D
) in the mobile-water region using (Parker and Valocchi, 1986):
1
1
−µ
D
=
µ
e
−
22
a
D
a
ν
D
(8.56)
15
1.0
Ω = 0.1
0.8
1.0
5
0.6
10
0.4
0.2
0
0
1
2
3
4
5
6
7
8 9 0
V/V
o
FIGURE 8.12
Effluent concentration distributions for different values of the parameter Ω of the SOMIM
model. (From H. M. Selim and M. C. Amacher. 1997.
Reactivity and Transport of Heavy Metals in
Soils
. Boca Raton, FL: CRC Press. With permission.)
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