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Electrochemical dewatering

Electrochemical Treatment (ECT) as a Case of Electroosmotic Dewatering (EOD) of the Cancer Tissue and Related Effects... [Pg.483]

Alternating current electrocoagulation (ACE) is an electrochemical treatment technology where aluminum polyhydroxide species are introduced into aqueous media to remove suspended solids, oil droplets, and soluble ionic species. This technology enhances the filtration and dewatering rates of solids removed from an effluent. [Pg.902]

Liquid wastes containing hexavalent chromium require reduction of chromium to the trivalent state prior to metal removal. Commonly used reducing agents are sodium metabisulfite, sulfur dioxide, ferrous sulfide, and other ferrous ions (ferrous sulfate, ferrous chloride, or electrochemically generated ferrous ion). All of these reagents create some form of chromium sludge, which must be separated and dewatered before disposal. [Pg.191]

The fundamental electrochemical approach of interest in this context is the electro-osmotic dewatering (EOD) of clays, the phenomenology... [Pg.302]

An electrochemical approach based on the considerations of double layers at the clay-water interface provides a more transparent approach for understanding the physical and chemical events occurring during electro-osmotic dewatering in particular, it shows more clearly how various parameters (applied voltage, pH profiles, zeta potential, electrode reactions, etc.) known to influence the EOD process come into play. The framework for the electrochemical interpretation of the EOD phenomenon is summarized in the next section. [Pg.311]

IV. THE ELECTROCHEMICAL APPROACH TO ELECTRO-OSMOTIC DEWATERING HELMHOLTZ-SMOLUCHOWSKI RELATION... [Pg.311]

The theoretical approach generally used "in electro-osmotic dewatering is an electrochemical one in which the Helmholtz-Smoluchowski relation is used to relate the electro-osmotic convective liquid velocity to such parameters as the viscosity and permittivity of the solution, the zeta potential of the clay surface, and the strength of the applied field. Also, electrode kinetic effects are taken into account where the data point to the involvement of electrochemical reactions at the electrodes during the EOD process. " In combined pressure-electro-osmotic dewatering (CPEOD), the effect of pressure is interpreted in an empirical, ad-hoc manner without any attempt to develop a comprehensive theoretical framework that combines the two driving forces, namely, the pressure and the electric field. [Pg.311]

The open-circuit potentials of the electrode/clay (electro-lyte)/electrode system were found to be between 1.8 and 2.3 V. It was concluded that these values arise from the electrochemistry of the system rather than from dewatering. However, the interpretation of these open-circuit potentials as arising from the hydroxides and oxides on the platinum anode, the pH effects, etc., is not electrochemically valid, as shown in Section IV [see Eq. (20)]. [Pg.321]

This discovery of Rabie et al., namely, that increasing the zeta potential near the anode by short-circuiting the electrodes after a dc power interruption, and thus restarting the electrolysis process (and thence dewatering), has provided the electrochemical clues for making other proposals for increasing the energetic efficiency of the EOD process. These are described below. [Pg.322]

Many other individual applications for decanters exist, outside the classifications already covered. In the agricultural sector, decanters are used to dewater pig manure, as well as other farming wastes. In the mechanical engineering sector, as well as the cutting and lubricating oil recycle systems, there is the removal of accumulated impurities from electroplating and electrochemical machining solutions. [Pg.146]


See other pages where Electrochemical dewatering is mentioned: [Pg.492]    [Pg.536]    [Pg.877]    [Pg.303]    [Pg.324]    [Pg.329]    [Pg.331]    [Pg.427]    [Pg.622]    [Pg.636]    [Pg.647]    [Pg.17]    [Pg.97]    [Pg.590]    [Pg.233]    [Pg.2788]    [Pg.178]   
See also in sourсe #XX -- [ Pg.326 ]




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