Method of simultaneous air-water wash of multiple- media...

Details Method of simultaneous air-water wash of multiple- media... Method of simultaneous air-water wash of multiple- media...

B - Operations, Transporting

01

D

182/99

B01D 23/24 (1980.01)

Patent

CA 1171364

METHOD OF SIMULTANEOUS AIR-WATER WASH OF MULTIPLE-MEDIA FILTERS ABSTRACT A method is described in which two or more granular filter media are used in combination in such a manner that the filter bed is backwashed using air and water simultaneously. The media size gradation and density are selected so that, although the media may be mixed during backwash, the media are separated into layers according to their density and/or size following termination of the simultaneous air-water wash and prior to returning the filter to the filtration mode. The simultaneous air-water wash step can be carried out without media loss by use of an appropriate media retaining procedure.

390223

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