filter discs including a revolving cultural of disks of filter ring acts to be immersed in a liquid or a suspension

摘要

PCT No. PCT/SE84/00347 Sec. 371 Date Aug. 12, 1985 Sec. 102(e) Date Aug. 12, 1985 PCT Filed Oct. 19, 1984 PCT Pub. No. WO85/01672 PCT Pub. Date Apr. 25, 1985.A disc filter includes a plurality of rotatable, axially spaced, annular discs (9), which are adapted to be partially submerged in a liquid or suspension to be filtered. Each disc comprises a plurality of hollow filter elements (10), the interiors of which communicate with axial suction channels (13) arranged at or near the circumference of the annular discs for withdrawal of filtrate. A collecting funnel (14) is introduced through all discs (10) to receive particles or parts of filter cake falling therefrom. The axial suction channels (13) are provided with backflow barriers (15') adapted to prevent liquid flow from the suction channels (13) radially back into the filter elements when raised above the liquid surface.