Cleaning of filters
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United States of America Patent
Stats
-
Jun 19, 1990
Grant Date -
N/A
app pub date -
Mar 10, 1988
filing date -
Jul 11, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A filter (10) has a shell (11) within which there is a bundle of microporous fibres (12). Pressurized feed suspension is introduced through inlet (15) and passes over the external walls of the fibers (12) with the clarified liquid being drawn from the lumens of the fibres (12) through outlet port (16) and the concentrated ffee being discharged through outlet (17). The solids retained within the shell are removed by a gaseous backwash cycle in which pressurized gas is introduced through the lumens and passes through the wall of the fibres (12) to dislodge solids retained on or in the fibre walls. The gaseous cleaning step is enhanced by varying the pressure within the housing (11) of the filter (10) while the gas is being introduced into the filter.
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