Liquid purification or separation – Processes – Separating
Patent
1996-02-05
1997-06-17
Cintins, Ivars
Liquid purification or separation
Processes
Separating
210274, 210275, 210293, B01D 2446
Patent
active
056393849
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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International Search Report dated Sep. 6, 1994 for International Application No. PCT/US 94/05244.
Bergmann Eugen O.
Brown Marvin A.
Hsieh Richard
Cintins Ivars
The F.B. Leopold Company
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