B - Operations – Transporting – 04 – B
Patent
B - Operations, Transporting
04
B
B04B 3/04 (2006.01) B01D 29/23 (2006.01) B01D 36/04 (2006.01) B04B 15/06 (2006.01)
Patent
CA 2193767
A method and apparatus for filtering a liquid from a liquid/solid mixture using a centrifuge. The centrifuge has a conveyor having a hub and a flight for imparting a centrifugal motion to the liquid/solid mixture. The conveyor is rotated for imparting the centrifugal motion. A filter is carried in the tank which holds the conveyor. The filter encircles the conveyor for filtering the liquid from the liquid/solid mixture. A backwash system has a tube having a series of nozzles positioned for spraying a fluid at the filter in a narrow band which circumscribes the filter. The tubing is connected to a header which projects out of the casing through an opening. The fluid sprayed through the nozzles is pumped through the header to the tubing having the nozzles. A cylinder is connected to the header for moving the header and the connected tubing longitudinally such that the nozzles move longitudinally along the filter for spraying the liquid against the filter in a narrow band distinct from a first narrow band by the relative movement of the nozzles to the filter. The fluid from the backwash system is at a force to counteract the centrifugal force of the mixture over the narrow band of the filter engaged by the spray. The fluid used for the backwash is the filtered liquid.
Danisco A/s
Gowling Lafleur Henderson Llp
Rhone-Poulenc Inc.
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