Patent ID: 8083943
Filing Date: 2011-12-27
Classification: B01D,C02F

Abstract:
1. A filtration device having a large number of filters, each said filter including a filter element comprising a monolithic ceramic porous body having partition walls defining cells as liquid flow paths, and a casing containing said filter element so that the liquid flows in a vertical direction, wherein said casing has an unfiltered liquid feed opening which feeds unfiltered liquid to said filter element, a filtrate discharge opening which discharges filtered liquid from said filter element, and an unfiltered liquid discharge opening which discharges the unfiltered liquid from said filter element; piping connecting said filters with each other comprising unfiltered liquid feeding header tubes having a plurality of openings connected with said unfiltered liquid feeding opening of said casing, filtrate recovery header tubes having a plurality of openings connected with said filtrate discharge opening of said casing, unfiltered liquid recovery header tubes having a plurality of openings connected with said unfiltered liquid discharge opening of said casing, a filtrate recovery collecting tube having at least two openings connected with said filtrate recovery header tubes, and L-type piping located between said filtrate recovery header tubes and said filtrate recovery collecting tube so that said filtrate recovery collecting tube is located only at a higher position than a position of said filtrate recovery header tubes, wherein said piping further includes an unfiltered liquid recovery collecting tube having at least two openings connected with said unfiltered liquid recovery header tubes, wherein said unfiltered liquid recovery collecting tube is located only at a higher position than a position of said unfiltered liquid recovery header tubes; and filter strings, each comprising a plurality of said filters connected in a row via said unfiltered liquid feeding header tube, said filtrate recovery header tube and the unfiltered liquid recovery header tube, wherein at least two rows of said filter strings are connected in parallel by said filtrate recovery collecting tube, and wherein said filtrate recovery collecting tube is located at a higher position than a position of said filtrate recovery header tubes.