Liquid purification or separation – Processes – Separating
Patent
1996-10-04
2000-07-25
Cintins, Ivars
Liquid purification or separation
Processes
Separating
210274, 210275, B01D 2446
Patent
active
060933291
ABSTRACT:
A method of backwashing a filter includes a) supplying a backwash liquid via a conduit toward one end of a filter bed; b) aspirating air into the backwash liquid upstream of the bed; c) introducing a mixture of air and backwash liquid into the filter bed at the one end thereof; and d) expelling backwash water and air from an opposite end of the filter bed. A related filter system includes a filter basin having a bed of filter media material therein; a filtrate channel proximate the basin; at least one tubular underdrain header in the bed and in fluid communication with the filtrate channel; and a backwash pump having a backwash water supply conduit selectively engageable with the underdrain header for supplying backwash liquid to the bed. The backwash water supply conduit includes a nozzle for aspirating air into the supply conduit at a location between the backwash pump and the bed.
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Cintins Ivars
United States Filter Corporation
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