Immersed membrane filtration process
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United States of America Patent
Stats
-
Oct 16, 2001
Grant Date -
N/A
app pub date -
Oct 25, 1999
filing date -
Jul 30, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A filtration process for filtering water with immersed microfiltration or ultrafiltration membranes in a batch mode includes repeated cycles comprising the steps of filling the tank to a level above the membranes, withdrawing permeate through the membranes, aerating the membranes to dislodge solids from the membranes and backwashing the membranes while draining the tank. The backwashing steps involve backwashings with a cleaning chemical interspersed with backwashings with permeate. The backwashings with a cleaning chemical follow a regimen of maintenance cleaning chosen to maintain acceptable permeability of the membranes or to reduce the rate of decline in permeability of membranes 24 over extended periods of time.
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