Patent ID: 7638051
Filing Date: 2009-12-29
Classification: B01D

Abstract:
1. A filter apparatus for clarifying contaminated liquid in a container, said filter apparatus comprising: a plurality of spaced filter elements arranged on a rotatably supported hollow shaft, said filter elements in fluid communication with said hollow shaft such that contaminated liquid that passes through said filter elements becomes clarified liquid conveyed by said hollow shaft; a stationary pipeline in fluid communication with said hollow shaft for conveying the clarified liquid out of the container; at least two spaced apart sealing elements disposed at different locations relative to said hollow shaft, each of said sealing elements comprising at least two seal members separated by a chamber, with a medium contained within said chamber; wherein said sealing elements are disposed such that failure of any one of said sealing elements does not result in contamination of the clarified liquid by contaminated liquid from the container; wherein said filter apparatus is disposed within a container, and further comprising a stationary connection piece between said hollow shaft and said pipeline through which clarified liquid from said hollow shaft is conveyed to said pipeline, said connection piece disposed in a wall of said container, said hollow shaft rotatable relative to said connection piece; and further comprising a drain box disposed within said container, said hollow shaft disposed through said drain box, said stationary connection piece disposed between said drain box and said container wall.