Apparatus for uniformly distribution gas and/or liquid in an underdrain lateral system

Underdrain lateral system, which is especially adapted for use in a gravity filter bed, includes, as its preferred embodiment, scallop-shaped laterals (26, 126) having an upper, wrapped wire, slotted screen surface (28). The screen surface supports and retains the filter media particles (118) direct...

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Bibliographic Details
Main Author RICHARD CHARLES MAXSON
Format Patent
LanguageEnglish
Published 19.01.1995
Edition5
Subjects
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
TRANSPORTING
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Summary:Underdrain lateral system, which is especially adapted for use in a gravity filter bed, includes, as its preferred embodiment, scallop-shaped laterals (26, 126) having an upper, wrapped wire, slotted screen surface (28). The screen surface supports and retains the filter media particles (118) directly, without the necessity of an underlying gravel layer, and is itself supported by channel-shaped rod members (34) which are welded to the wires (30). The web portions (36) of the channel-shaped rod members perform the function of simultaneously distributing air and water during backwashing, and include a smaller total area of apertures (38) in upper channels and a larger total area of apertures (40) in lower channels to cause a plenum (56) to be formed inside the laterals which ensures that the distribution of air and water will be uniform throughout the lateral, even if the lateral is not perfectly level. Distribution of the air and water throughout all of the laterals is made even more uniform by mounting the laterals on a header (124) and providing perforated flow tubes (122) which extend from each lateral into the header to produce an additional air plenum (135) therein.
Bibliography:Application Number: AU19920020949