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ABSTRACT
The electroosmotic dewatering (EOD) reported by Yoshida et al. (3) under low-frequency A.C. conditions is shown to be equivalent to EOD carried out under D.C. conditions with periodic polarity reversal. The interpretation of their results is carried out here in terms of electrochemical considerations (e.g., pH gradients, zeta potentials) with lesser role assigned to factors considered paramount by Yoshida, e.g., heating effect in the dry region near the anode.
More importantly, it is pointed out that the practical advantages of EOD under A.C. conditions claimed by Yoshida et al. are based on an invalid comparison of their results with EOD under continuous D.C. conditions; a comparison under equivalent conditions would be between low-frequency A.C. conditions and those under D.C. field but with periodic polarity reversal — the enhanced dewatering claimed under “A.C. conditions” by Yoshida would disappear when EOD under D.C. conditions with periodic interruption and/or polarity reversal is considered.