Methods for improving filtration performance of hollow fiber membranes
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United States of America Patent
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May 27, 2008
Grant Date -
Aug 14, 2003
app pub date -
Dec 18, 2002
filing date -
Jan 9, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In accordance with the present invention, there are provided methods for improving performance of hollow fiber filtration membrane modules. Invention methods comprise a unique backwashing technique wherein the hollow fiber membranes within the module are pressurized with a gas on the feed side at specified times during the backwash. Periodic use of invention methods effectively removes fouling components from the hollow-fiber membranes, thereby providing stable permeability and low trans-membrane pressures, which results in an efficient and economic filtration process. In addition, there are provided methods for cleaning hollow fiber membranes and increasing filtrate flow rate through membranes.
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