Upflow filter and method of washing same

Details Upflow filter and method of washing same Upflow filter and method of washing same

1992-01-13

1993-03-30

Silverman, Stanley S.

Liquid purification or separation

Processes

Separating

210738, 210794, 210274, 210279, 210269, 210807, B01D 3703, B01D 2446

Patent

active

051981246

ABSTRACT:
A method of washing an upflow filter between service runs employs a filter bed having a non-buoyant particulate filter layer through which influent to be filtered is directed in an upward direction, and through which liquid employed in the washing operation is directed in an upflow direction. A two-stage washing operation includes the steps of first directing a combination of air and liquid in an upflow direction through the filter layer with the velocity of the liquid being less than the minimum fluidization velocity of the filter layer, for disrupting only some floc retained in the filter layer during a previous service run, and thereafter directing only liquid in an upflow direction through the filter layer at a velocity less than the minimum fluidization velocity of the filter layer for removing disrupted floc from the filter layer while leaving some floc attached to said particulate media of the filter layer. The process most preferably is carried out with a filter bed including a coarse, particulate media flocculation layer for distributing the flow of influent and promoting flocculation.

REFERENCES:
patent: 4479880 (1984-10-01), Treanor
patent: 4604197 (1986-08-01), Louboutin et al.
patent: 4608181 (1986-08-01), Hsiung
patent: 4668405 (1987-05-01), Boze
patent: 4707257 (1987-11-01), Davis et al.
patent: 5080808 (1992-01-01), Kim et al.

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