Method for enhancing the separation capacity of a multi-bed...

Details Method for enhancing the separation capacity of a multi-bed... Method for enhancing the separation capacity of a multi-bed...

B - Operations, Transporting

01

D

362/63

B01D 24/02 (2006.01) B01D 24/00 (2006.01) B01D 24/46 (2006.01) B01D 36/02 (2006.01) B01D 37/03 (2006.01)

Patent

CA 1335519

A multi-bed filtration system includes an upstream filter bed in series with a downstream filter bed of nonbuoyant media. Also included is a system for periodically backwashing the nonbuoyant filter bed. Coagulant-treated water is passed through the upstream filter bed, followed by the downward flow of water through the downstream filter bed. Thereafter, the downward flow of water through the downstream filter bed is periodically interrupted. During these interruptions, a limited amount of water is introduced upwardly through the downstream filter bed by the backwashing system. Such backwashing frees coagulated solids within the bed, causing the solids to move upwardly through the bed. The solids ultimately collect in a zone above the surface of the bed. When normal filtration recommences, water passes through the deck of solids in the zone prior to entering the nonbuoyant filter bed.

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