Environmental Engineering Reference
In-Depth Information
The classical H-S equation expresses the electroosmotic velocity of the
fluid as a function of the electric field and the electrokinetic potential of
the clay. Both of these parameters vary during electrokinetic transport, and
result in a nonlinear process. It was shown analytically and experimen-
tally that the electroosmotic velocity could be uncoupled from the applied
electric field when surface conductivity s s and the resulting portion of the
current transferred over the solid-liquid interface i s are used as intrinsic
properties of the clay to describe the velocity.
The migration of the ions in the bulk fluid were modeled taking into
consideration the changing electric field due to migration, and other effects
such as retardation and electrophoretic effects that reduce ion mobility.
The model appeared to simulate well the long-term ion distribution in the
soil as the conductivity and the electric field varied in time and space.
Finally, the experimental results of electrically enhanced extraction,
separation, transformation, stabilization and containment in clay and clay
rich porous media were presented and discussed in the framework of the
theoretical electrochemical and electrokinetic models introduced earlier.
The data appeared to support the hypothesis that Faradaic current passage
orthogonal to the planes in the electric double layer of clay particles may
drive forth redox reactions on clay surfaces.
References
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