System for maintaining a clean skein of hollow fibers while filtering suspended solids
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United States of America Patent
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Aug 31, 1999
Issued Date -
N/A
app pub date -
Feb 17, 1998
filing date -
Aug 11, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Cited Art Landscape
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