System and method of decreasing waste fluid in continuous backwa

Details System and method of decreasing waste fluid in continuous backwa System and method of decreasing waste fluid in continuous backwa

1991-05-22

1992-05-12

Silverman, Stanley S.

Liquid purification or separation

Processes

Separating

210805, 210807, 210808, 210189, 210268, 210279, B01D 2428, B01D 2446

Patent

active

051125048

ABSTRACT:
A filtering system includes a filter vessel containing a movable granular media bed, a feed stream inlet port for flowing a liquid-solid stream through the bed for filtration, a dirtied media outlet and a cleaned effluent outlet. A vertical cleaning section in either a separate stand-alone washing section vessel or in a washing section within the filter vessle, includes a wash path in which a washing liquid typically a portion of the cleaned effluent washes contaminants from the dirtied media resultant from filtration of the feed stream. The resultant contaminants-containing wash water is pumped to waste but a sidestream thereof is recycled at least in part to the filter vessle to a location in the vessel between the feed stream inlet port and the dirtied media outlet so that the liquid ordinarily transported with the dirty media at the bottom of the filter is replaced, at least in part with the recycle liquid.

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