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

1987-01-28

1987-09-15

Wyse, Tom

Liquid purification or separation

Processes

Including controlling process in response to a sensed condition

210785, 210786, 210795, B01D 3700

Patent

active

046938311

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 wider range of solids load, liquid load and other factors affecting the filtration.

REFERENCES:
patent: 3459302 (1969-08-01), Ross
patent: 3717251 (1973-02-01), Hampton
patent: 3817378 (1974-06-01), Ross
patent: 4019985 (1977-04-01), Fuller et al.
patent: 4627923 (1986-12-01), Ross

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