Rotary drum filter with reciprocating nozzle means
AssigneeDorr-Oliver Incorporated
InventorsDavid P. Baird, Richard L. Reiter
Life of this patent
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Abstract
A rotating drum filter assembly for thickening lime sludge includes a liquid jet distributor for directing liquid jets against a strip of lime sludge filter cake on the ascending side of the drum. The distributor is positioned on the ascending side of the drum and within 45.degree. of a vertical plane tangential to the drum peripheral surface. The liquid jets are directed so as to disperse the strip in a manner such that substantially all of the lime sludge comprising the strip remains on the drum. Cake wash water formed by water distributed from shower heads immediately refills the cleaned strip thereby minimizing loss of vacuum within the hollow drum interior.
Claims10
A rotary drum filter assembly comprising:
- a filter drum having a peripheral filter surface covered with a filter medium and a hollow interior, said drum being mounted on a shaft for rotation about a substantially horizontal axis, said drum ascending on one side of said axis in a direction of rotation and said drum descending on the other side of said axis in the direction of rotation;
- a nozzle positioned on said ascending side of said drum for directing a liquid jet toward said peripheral filter surface at an angle between about 0 degrees and 45 degrees of a vertical plane tangential to said peripheral filter surface, the angle being measured from the vertical plane in a direction opposite the direction of rotation, said liquid jet being directed against a precoat layer and an outer layer of sludge on said peripheral filter surface so as to disperse a strip of the layers in a manner such that substantially all of the sludge which comprises the strip of the layers remains on the drum;
- a shower head positioned past said nozzle in the direction of rotation of said drum;
- and
- a scraper positioned on the descending side of said drum for scraping accumulated sludge from said peripheral filter surface.
Dependencies are inferred from the claim text.