System for maintaining a clean skein of hollow fibers while filt

Details System for maintaining a clean skein of hollow fibers while filt System for maintaining a clean skein of hollow fibers while filt

1998-02-17

1999-08-31

Fortuna, Ana

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

21032169, 21032179, 21032189, 2102572, 2101952, 210650, 261126, 261DIG70, B01D 6300, B01D 6100

Patent

active

059449977

ABSTRACT:
The outer surfaces of hollow fiber membranes in a skein, or a bank or cassette of stacked skeins, are kept essentially free of solids by maintaining a substantially uniform flow of a stream of coarse bubbles through each of plural orifices in an aerator disposed beneath the fibers. Aerators for skeins used in microfiltration of wastewater in a tank are periodically flushed by injecting flushing air into permeate returned to the tank over a short period. The air is injected into returning permeate for less than 1 minute, preferably less than 20 sec so as to produce discrete masses of water which are flowed laterally through the body of the aerator, cleaning its walls and maintaining the orifices essentially free from plugging.

REFERENCES:
patent: 3153682 (1964-10-01), Walker
patent: 3242072 (1966-03-01), Walker
patent: 3501133 (1970-03-01), Drier et al.
patent: 3953554 (1976-04-01), Loughridge
patent: 5248424 (1993-09-01), Cote et al.
patent: 5639373 (1997-06-01), Mahendran et al.
patent: 5647988 (1997-07-01), Kawanishi et al.
patent: 5783083 (1998-07-01), Henshaw et al.

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