Membrane bioreactor, process and aerator
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United States of America Patent
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-
Mar 8, 2005
Grant Date -
Jun 10, 2004
app pub date -
Dec 5, 2002
filing date -
Dec 5, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A reactor has an aerobic tank, an anoxic tank and a sealed membrane tank with conduits for circulating mixed liquor between them. Permeation starts when the mixed liquor reaches a high level and stops when the mixed liquor reaches a low level. A sensor, for detecting the mixed liquor level, may stop and start permeation. Pressure builds in the membrane tank when membrane air is on. Transmembrane pressure is also provided by gravity flow or siphon. Membrane air generates an air lift which drives the mixed liquor circulation. The total amount of air provided by an air source is divided and varied in time between the membrane aerator and the process aerator. The process aerator acts as a screening inlet to the conduit to the membrane tank. Chemical maintenance cleaning is provided by gravity flow.
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