Liquid purification or separation – Particulate material type separator – e.g. – ion exchange or... – With rehabilitation means
Patent
1995-01-27
1996-09-10
Nessler, Cynthia L.
Liquid purification or separation
Particulate material type separator, e.g., ion exchange or...
With rehabilitation means
210275, 210279, 210291, 210271, B01D 2446
Patent
active
055542816
ABSTRACT:
A travelling bridge filtration unit includes a tank having a bottom wall, a pair of side walls and a pair of end walls arranged to provide a rectangular tank with an open top. An interior partition in the tank extends lengthwise between the pair of end walls forms a filtrate channel between the interior partition and one of the side walls, and a filter basin between the interior partition and the other of the pair of side walls, with a bed of filter media located in the filter basin. A travelling bridge is mounted on the tank for movement therealong in a lengthwise direction, the travelling bridge supporting a backwash pump and a backwash hood for movement across the filter basin in close proximity to the filter bed. A plurality of structural underdrain headers extend between the interior partition and the other of the pair of side walls, the headers having closed ends adjacent one of the side walls, and open ends extending through the interior partition in communication with the filtrate channel. The underdrain headers each further include a plurality of apertures formed along the length thereof so that filtrate flowing down through the filter media can be discharged via the headers to the filtrate channel, and so that successive portions of the bed of filter media can be backwashed with filtrate flowing into the bed via the headers and then up through the filter media to be removed via the backwash hood.
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Nessler Cynthia L.
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