Method and apparatus for deflecting granular material away from

Details Method and apparatus for deflecting granular material away from Method and apparatus for deflecting granular material away from

1983-04-13

1984-10-30

Fisher, Richard V.

Liquid purification or separation

Processes

Separating

210274, 210275, B01D 2324

Patent

active

044798806

ABSTRACT:
A liquid is filtered through a bed 7 of granular material and cleaning of the bed is conducted, when necessary, by upflow of wash water through orifices 9 and air through orifices 12 positioned mid-way between the orifices 9. An overflow 13 defines a free water space 15 above the bed and a baffle formed of elements 18, 19 and 20 surrounds the overflow outlet. During cleaning the wash water and air flow upwardly at rates such that some granular material is entrained by upflowing air bubbles and could be carried to the overflow 13 but substantially all the entrained granular material is separated from the entraining air bubbles at or near the top of the free space 15.

REFERENCES:
patent: 798473 (1905-08-01), Wilson
patent: 1069737 (1913-08-01), Stevenson
patent: 3313420 (1967-04-01), Hirsch
patent: 3925202 (1975-12-01), Hirs
patent: 4322299 (1982-03-01), Scholten et al.
patent: 4338202 (1982-07-01), Louboutin

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