Deep bed thickener/clarifiers with enhanced liquid removal

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 21/00 (2006.01) B01D 21/06 (2006.01) B01D 21/08 (2006.01) B01D 21/18 (2006.01) B01D 21/24 (2006.01) B01D 21/28 (2006.01)

Patent

CA 2378330

The enhanced deliquifying of the compacted bed of deep bed thickener/clarifier is disclosed. Such an apparatus comprises a vessel receiving a slurry of liquid and solid particles suspended in the liquid. The vessel defines a free settling zone, a hindered settling zone intermediate, an upper clarification zone and a lower compaction zone. A deliquifying member is provided in the vessel extending up between at least two zones for facilitating the upward flow of free liquid from one of the lower zones and the settling of particulates. A rotating rake shaft with pickets are so designed to release the interstitial liquid trapped in a lower zone. The pickets provide pathways for liquid to release generally vertically. The released liquid travels upward to the deliquifying member and on into the clarification zone. The lower zone, freed of the interstitial water, further collapses becoming more concentrated or dense. Image

L'invention concerne la déliquéfaction améliorée du lit compacté d'un appareil d'épaississement/clarification du type lit épais. Un tel appareil comprend un récipient destiné à recevoir une bouillie de particules liquides et solides en suspension dans le liquide. Le récipient définit une zone de décantation libre, une zone intermédiaire de décantation entravée, une zone de clarification supérieure et une zone de compactage inférieure. Le récipient est également pourvu d'un élément de déliquéfaction s'étendant vers le haut entre deux zones au moins, de manière à faciliter d'une part l'écoulement vers le haut du liquide libre à partir de l'une des zones inférieures et d'autre part, la décantation des particules. Un arbre à racloir rotatif pourvu de pics est conçu pour libérer le liquide interstitiel piégé dans une zone inférieure. Les pics créent des passages libérant le liquide généralement à la verticale. Le liquide libéré se déplace vers le haut vers l'élément de déliquéfaction pour atteindre la zone de clarification. La zone inférieure, dont on a éliminé l'eau interstitielle, réduit de volume et devient donc plus concentrée ou plus dense.

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