Airlift membrane device and membrane bioreactor and bioreactor process containing same
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United States of America Patent
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Jul 27, 2004
Grant Date -
Feb 26, 2004
app pub date -
Sep 30, 2002
filing date -
Aug 21, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A submerged, vertically-mounted membrane device, the device receiving a gas-sparged feed stock at a bottom feed inlet to provide airlift circulation of the feed stock through the device and separating the feed stock into filtrate and residual gas-containing retentate which passes from the top end of the device. The device comprises a structure of one or more monolith segments of porous material each monolith segment defining a plurality of passageways extending longitudinally from a bottom feed end face to a top retentate end face. A porous membrane is applied to the walls of the monolith segment passageways to provide a separating barrier. At least one filtrate conduit within the device carries filtrate from within the device toward a filtrate collection zone of the device, and the filtrate conduit provides a path of lower flow resistance than that of alternative flow paths through the porous material. A seal is provided to separate feed stock and retentate from the filtrate collection zone.
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