Apparatus and method for improving gas backwash in lateral under

Liquid purification or separation – Processes – Separating

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Details

210274, 210275, 210293, 210541, B01D 2446

Patent

active

054893887

ABSTRACT:
An apparatus and method for gas backwashing a granular media supported upon a lateral underdrain is disclosed. The lateral underdrain includes a plurality of dispersion apertures therethrough and at least one liquid return conduit extending to a discharge at a level below the dispersion apertures. The present invention provides for equal distribution of backwash gas across the entire lateral underdrain by directing backwash gas through the dispersion apertures into the granular media and directing liquid from the granular media through the liquid return conduit without obstructing backwash gas flow through said apertures from a gas pocket formed underneath said apertures.

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