Method and apparatus for enhancing filter bed performance

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 3/06 (2006.01) B01D 24/22 (2006.01) B01D 24/46 (2006.01)

Patent

CA 2495440

In a vessel containing a filter bed and containing a mixed liquor containing suspended solids, a system disturbs/dislodges a sludge mat that settles on the filter bed. Thus, the system controls the sludge mat on the filter bed that otherwise may blind the filter bed and significantly reduce or stop process liquid flow into and through the filter bed. The system helps maintain effective vessel effluent flowrates with reduced requirements for filter bed backwashing or other filter bed maintenance. The system includes a sludge mat dislodging member that moves along the filter bed surface, preferably on but substantially not inside the filter bed, to disrupt/dislodge the sludge mat and/or prevent formation of the sludge mat. Preferably, the dislodging member is carried inside the vessel on a moving arm or arms that rotate in a plane parallel to the filter bed surface. The preferred sludge mat dislodging member(s) hang from the rotating arm(s) to slide along the top of the filter bed through the sludge mat. The sludge mat control methods and apparatus preferably are used during normal operation of the reactor/vessel, without requiring shutdown or interruption of the process. The methods and apparatus may be effective in sludge blanket microbial remediation reactors that require high flowrates of liquid effluent due to low residence times in a given vessel.

L'invention porte sur un système qui disloque et déplace la couche de boue s'entassant sur le lit filtrant d'une cuve remplie d'une liqueur mixte contenant des solides, ladite couche de boue pouvant sinon, réduire ou arrêter le flux de liquide de processus atteignant ou traversant le lit filtrant. Le système, qui maintient un débit efficace des effluents de la cuve et diminue les exigences de rétrolavage et d'entretien du lit filtrant, comporte un élément dislocateur se déplaçant de préférence à la surface du lit filtrant mais de préférence peu ou pas à l'intérieur et disloque et déplace la couche de boue et/ou en prévient la formation. L'élément dislocateur est de préférence placé dans la cuve sur un bras ou des bras mobiles tournant dans un plan parallèle à la surface du lit filtrant. Le ou les éléments dislocateurs, qui sont suspendus au ou aux bras tournants, glissent sur la surface du lit filtrant en traversant la couche de boue. Le procédé et l'appareil de régulation de la couche de boue s'utilisent de préférence pendant le fonctionnement normal d'un réacteur ou d'une cuve sans nécessiter l'arrêt ou l'interruption du processus; ils peuvent s'appliquer efficacement à des réacteurs de biorestauration accélérée demandant de forts débits des effluents liquides en raison de leurs faibles temps de séjour dans la cuve

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