Rise-rate control of pulsed-bed granular medium filters
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United States of America Patent
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Sep 15, 1987
Grant Date -
N/A
app pub date -
Jan 28, 1987
filing date -
Jan 28, 1987
priority date (Note) -
Expired
status (Latency Note)
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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.
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