MOVING BED PARTICULATE FILTER

摘要

A filtration apparatus consisting of a filtration vessel which contains a bed of particulate material and whose lower portion is of diminished cross section area leading to an outlet through which particulate material may be withdrawn. The apparatus is designed to permit the withdrawal of material from the base of the bed thereof and to provide for the supplying of replacement particulate material to the bed in such a manner that the bed has a free inclined upper surface extending downwardly from an opening through which replacement particulate material is fed to the bed. The apparatus is designed to cause the liquid to be filtered to enter the bed through the free inclined upper surface for flow downwardly through the bed to a filtrate outlet formed by a screen which retains the particulate material. The apparatus is characterized by the provision of a baffle disposed within the filtration vessel above the outlet therefrom through which material is withdrawn from the base of the bed.