Downflow filter with high velocity backflush

Details Downflow filter with high velocity backflush Downflow filter with high velocity backflush

1985-06-19

1987-05-26

Sever, Frank

Liquid purification or separation

Processes

Separating

210274, 210278, B01D 2312

Patent

active

046684050

ABSTRACT:
A method and apparatus for backflushing downflow filters is disclosed which comprises providing a closed container having contiguous, vertically adjacent filter layers. A layer of gravel is provided below the filter layers and is separated from the bottom filter layer by a foraminous gravel retention member. Fluid under pressure is introduced through a plurality of fluid nozzles into the gravel layer to backflush the filter layers. Backflush fluid in introduced at a sufficient flow rate to fluidize all of the filter layers to segregate them in accordance with their specific densities and particle size. Introducing the backflush fluid into a gravel layer through a plurality of nozzles helps prevent development of localized areas of high fluid velocity that can cause intermingling of the filter layers during backflush.

REFERENCES:
patent: 3554377 (1971-01-01), Miller

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