Declining rate filter systems and methods

Details Declining rate filter systems and methods Declining rate filter systems and methods

1991-06-28

1992-08-11

Silverman, Stanley S.

Liquid purification or separation

Processes

Separating

210275, 210293, B01D 2440

Patent

active

051376458

ABSTRACT:
Declining rate filtration systems using influent siphoning for influent flow to a bed of particulate filter media are improved by using at least two influent siphons with each filter bed. In use of such improved systems, influent is siphoned from a flume source or the like to the filter bed after backwashing of the filter media through a first siphon and, thereafter as headloss in the filter bed increases, further influent from the source is siphoned to the filter bed through a second siphon that has an effective minimum cross-sectional area substantially greater than that of the first siphon.

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patent: 3771655 (1973-11-01), Hudson, Jr.
patent: 3957637 (1976-05-01), Morey
patent: 4537687 (1985-08-01), Piper

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