Deep bed filtration system

Abstract

A deep bed filter system comprising a plurality of filter media beds, each having a respective media regeneration sub-system that includes some components associated with an individual filter bed and other components that are shared with all filter beds in the system, thereby improving the utilization of available space and lowering the materials and labor costs relative to known systems. A central column extends upwardly along the axis through the upper and lower portions of the vessel, thereby defining an annular volume extending substantially from the bottom of the vessel through the upper and lower portions. A plurality of distinct tubes extend through the central column, with each tube having a lower, intake end situated at the bottom for drawing dirtied filter media from the lower portion of the vessel into the column and transporting the drawn media upwardly through the column to a second discharge end at an elevation above the filtrate level of the filtrate region. A plurality of media washing devices are each situated in an azimuthally distinct location above the region of filter media and are fluidly connected to at least one of the transport tubes such that each tube delivers a substantially continuous flow of dirtied media to only one washing device. A plurality of media distribution devices associated respectively with the plurality of washing devices, direct the dropping clean media to a respective plurality of locations on the region of filter media.