Agriculture Reference
In-Depth Information
6.6 Experimental Data on Transport
In the first example, Zhang and Selim (2011) investigated the capability of
SOM in describing the mobility and reactivity of arsenite in two different
soils. Results from their miscible displacement experiments indicated that
for both soils, arsenite BTCs exhibited strong retardation, with diffusive
effluent fronts followed by slow release or tailing during leaching. They also
found that SOM, which accounts for equilibrium, reversible, and irrevers-
ible retention mechanisms, well described arsenite transport results from
the soil columns. Figures 6.23 and 6.24 are examples of predictions based on
several versions of the SOM for Windsor and Olivier soils. Based on these
results, Zhang and Selim (2011) argued that the transport patterns of arsenite
in these soils are indicative of dominance of kinetic retention during trans-
port in soils. Zhang and Selim (2011) concluded that based on inverse and
predictive modeling results, the SOM successfully depicted arsenite BTCs
from several soil columns and is thus recommended for describing arsenite
transport in soils.
In the second example, Elbana and Selim (2012) carried out miscible dis-
placement column experiments and batch adsorption to assess Cu mobility
and reactivity in calcareous soils. A second objective was to examine the
0.20
Windsor - Arsenite
Column 201
0.15
Measured
M6 =
K
e
,
k
1
,
k
2
,
k
3
M7 =
K
e
,
k
1
,
k
2
,
k
i
M8 =
k
1
,
k
2
,
k
3
,
k
i
M9 =
K
e
,
k
1
,
k
2
,
k
3
,
k
i
0.10
0.05
0.00
0
10
20
30
40
50
60
Pore Volume (V/V
o
)
FIGURE 6.23
Comparison of second-order model simulations using several model versions for describing
the arsenite breakthrough curve (BTC) from Windsor soil.
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