Liquid sand filter

Details Liquid sand filter Liquid sand filter

1979-02-12

1981-01-20

Smith, William F.

Liquid purification or separation

Particulate material type separator, e.g., ion exchange or...

With rehabilitation means

210290, 220 85B, B01D 2324

Patent

active

042461197

ABSTRACT:
An upwash sand filter with a diaphragm hold-down for the granular filter media during filter stage is operable with self-graded coarse-to-fine media for upflow filtration, downflow filtration, or combined up and down flow to a central exit filtration. The media is held in place by a diaphragm that may be a perforated plate for allowing liquid to pass through the perforations, and in the downflow embodiment, the media column is supported on another perforated wall or plate to allow a final lower layer of coarser media to be used so that the plate itself is not the finest layer of the filter. In the upflow embodiment, a coarser top layer is employed for this same purpose. The diaphragm serves in all embodiments to prevent loss of media and avoid channeling through the media thereby allowing exceptionally high filter rates.

REFERENCES:
patent: 620621 (1899-03-01), Veazie
patent: 4139473 (1979-02-01), Alldredge

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