Filters

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B - Operations, Transporting

01

D

182/31

B01D 33/03 (2006.01) B01D 61/22 (2006.01) B01D 63/16 (2006.01) B01D 65/08 (2006.01) B01D 69/02 (2006.01)

Patent

CA 1275262

ABSTRACT A filter which is particularly useful with biological material is formed of porous piezoelectric material such as PZT or Polyvinylidene fluride. By an application of a voltage to the piezoelectric material, the filter body is caused to vibrate so as to inhibit fouling. In a modification, the piezoelectric material is not itself porous but is bonded to a filter membrane such that vibrations of the piezoelectric material are transmitted to the membrane. Through suitable control of the vibration, the selectivity of the filter can be controlled. In other modifications the vibratory movement of the filter membrane can be produced in other ways such as electro-mechanically.

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