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ELECTROOSMOT1C DEWATERING UNDER A. C. ELECTRIC FIELD WITH PERIODIC REVERSALS OF ELECTRODE POLARITY

1999; Taylor & Francis; Volume: 17; Issue: 3 Linguagem: Inglês

10.1080/07373939908917550

1532-2300

Hiroshi Yoshida, K. Kitajyo, Makoto Nakayama,

Iron oxide chemistry and applications

ABSTRACT D.C. electric field has been usually used for electroosmotic dewatering. Under the condition of D.C., however, electrical contact resistance between the electrode and dewatering material is increased considerably with the process of dewalering. Such a circumstance hinders continuation of effective electroosmotic dewatering. To reduce the hindrance, application of A.C. electric field with periodic reversals of die electrode polarity can be expected as an improvement of electroosmotic dewatering. Electroosmotic dewatering under the condition of A.C. was experimentally investigated mainly in the region of low frequency below Hz for the electrode polarity reversals. In the dewatering process, the A.C. electric field could reduce the hindrance caused by the D.C, and final dewalered amount was increased more than that under the D.C. electric field. For constant applied voltage, the frequency condition, at which electric current passing through the material was almost not changed with time, gave the max...