Method and apparatus for increasing filter contaminant...

Details Method and apparatus for increasing filter contaminant... Method and apparatus for increasing filter contaminant...

2006-05-16

2006-05-16

Popovics, Robert James (Department: 1724)

Liquid purification or separation

Processes

Separating

C210S795000, C210S275000, C210S279000, C210S290000

Reexamination Certificate

active

07045067

ABSTRACT:
The filter contaminant loading capacity of a depth granular media filter is increased by imposing a so-called “back-slip” on the filter bed. At intervals between normal backwashing, a volume of liquid is passed upwardly through the media bed under flow conditions selected to displace at least some of the contaminants upwardly in the bed while essentially removing none of the contaminants from the filter vessel. Preferably, the filter bed comprises at least two media types of different but uniform particle sizes and densities, the media types each forming a distinct layer in which the effective particle size of the media in each successive layer decreases in a downward direction in the vessel.

REFERENCES:
patent: 293745 (1884-02-01), Hyatt
patent: 3817378 (1974-06-01), Ross
patent: 3876546 (1975-04-01), Hsiung et al.
patent: 4166037 (1979-08-01), Montagnon
patent: 4668405 (1987-05-01), Boze
patent: 4693831 (1987-09-01), Garzonetti
patent: 2004/0020870 (2004-02-01), Amburgey, Jr.

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