Apparatus and method for improving gas backwash in lateral...

Details Apparatus and method for improving gas backwash in lateral... Apparatus and method for improving gas backwash in lateral...

B - Operations, Transporting

01

D

B01D 24/22 (2006.01) B01D 24/24 (2006.01) B01D 24/38 (2006.01)

Patent

CA 2187515

An apparatus (10) and method for gas backwashing a granular media (14) supported upon a lateral underdrain (12) is disclosed. The lateral underdrain (12) includes a plurality of dispersion apertures (40) therethrough and at least one liquid return conduit (36) extending to a discharge (20) at a level below the dispersion apertures (40). The present invention provides for equal distribution of backwash gas across the entire lateral underdrain (12) by directing backwash gas through the dispersion apertures (40) into the granular media (4) and directing liquid from the granular media (14) through the liquid return conduit without obstructing backwash gas flow through said apertures (40) from a gas pocket (50) formed underneath said apertures (40).

L'invention concerne un appareil (10) et un procédé pour laver au gaz à contre-courant un milieu granulaire (14) se trouvant au-dessus du canal de drainage latéral (12). Le canal de drainage latéral (12) comporte une pluralité d'ouvertures de dispersion (40) et au moins une conduite (36) pour le retour du liquide aboutissant à une évacuation (20) située à un niveau plus bas que les ouvertures de dispersion (40). La présente invention permet une répartition égale du gaz de lavage à contre-courant sur tout le canal de drainage latéral (12) en dirigeant le gaz de lavage à contre-courant par les ouvertures de dispersion (40) dans le milieu granulaire (14) et en dirigeant le liquide du milieu granulaire (14) vers la conduite de retour du liquide, sans gêner le flux de gaz de lavage à contre-courant par lesdites ouvertures (40) depuis une poche de gaz (50) formée sous lesdites ouvertures (40).

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