Rise-rate control of pulsed-bed granular medium filters

Details Rise-rate control of pulsed-bed granular medium filters Rise-rate control of pulsed-bed granular medium filters

B - Operations, Transporting

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B01D 24/00 (2006.01) B01D 24/22 (2006.01) B01D 24/46 (2006.01) B01D 24/48 (2006.01) B01D 29/60 (2006.01) B01D 29/62 (2006.01)

Patent

CA 1305073

RISE-RATE CONTROL OF PULSED-BED GRANULAR MEDIUM FILTERS ABSTRACT A method for controlling the pulsing of a granular medium filter, based on determination of the rise rate of liquid level above the filtration medium. A pulse system is activated whereby sub-fluidizing pulses of a fluid are directed upwardly through the filter medium from an array of orifices, and each pulse is initiated whenever the determined rise rate attains a predetermined value. The pulses dislodge solids from the upper surface of the bed and store a portion of the solids within the bed itself at particular loci, for decreasing the resistance of the bed and reducing the rise rate. The frequency of backwash is optimized over a wide range of solids load, liquid load and other factors affecting the filtration.

547917

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