Filtration method and apparatus
AssigneeGenera Technologies Limited
InventorAdrian Parton
Life of this patent
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Abstract
An expansible, compressed foam is used a s a filter medium and captured particulates are released from the foam by expanding the foam to open its pores. Micro-organisms such as Cryptosporidium or Giardia cysts may be trapped and recovered at high eficiency in a small volume of wash liquid easing further analysis. A foam filter element comprises thirty discs (36) of retriculated foam compressed between end plates (28,30) to about one tenth of their original thickness.
Claims14
Filter apparatus comprising a foam filter medium which is an expansible, compressed, open cell, solid foam in the form of a stack of a plurality of filter elements of said foam stacked as layers upon one another and compressed in the direction of said stacking by a factor of at least 5.
A method of filtering particles from a fluid comprising passing said fluid containing said particles through a filter medium comprising a stack of a plurality of filter elements of foam stacked as layers upon one another and compressed in the direction of said stacking by a factor of at least 5 to trap said particles in said foam, wherein said foam is an expansible, compressed, open cell, solid foam and said foam is released from said compression and expanded, and said particles are washed out of said foam.
A filter cartridge comprising a first compression member and a second compression member and compressed between said compression members by a factor of at least 5 as a filter medium a plurality of stacked layers of an expansible, compressed, open cell, solid foam.
Dependencies are inferred from the claim text.