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Electrokinetic dewatering of a phosphate clay

1997; Elsevier BV; Volume: 55; Issue: 1-3 Linguagem: Inglês

10.1016/s0304-3894(97)00018-6

1873-3336

Julie Q. Shang, K. Y. Lo,

Soil and Unsaturated Flow

The principles of electrokinetic dewatering are: (1) electrophoresis, the movement of colloidal particles in a direct current electric field; (2) dielectrophoresis, the movement of colloidal particles in a non-uniform electric field; and (3) electro-osmosis, the water flow in porous media in a direct current electric field. Electrokinetic dewatering of a phosphate clay was investigated in an experimental program. The results show that the velocity of sedimentation is controlled by the applied current density and that electro-osmotic permeability dominates the effectiveness of electrokinetic consolidation. The intermittent current and polarity reversal can significantly improve the effectiveness of electrokinetic dewatering and reduce energy consumption and adverse electrode reactions.