Back to results
US 2002/0153313 A1Published application
Inverted air box aerator and aeration method for immersed membrane
AssigneeZenon Environmental Inc.
InventorPierre Cote
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeZenon Environmental Inc.
InventorPierre Cote
Estimating the term…
An aerator for immersed filtering membranes has an aerator shell with openings for discharging bubbles from its upper surface and a shape capable of temporarily containing a volume of air in fluid communication with the openings. The shell is open to tank water below it and located so that discharged bubbles will rise through an assembly of the filtering membranes. The shell may be wholly or partially made of parts of the assemblies of filtering membranes. A supply of air is provided to the air space in the aerators alternating between a high flow rate and a low flow rate in short cycles of between about 10 seconds and 100 seconds. A filtration system has an inlet for adding substrate and an outlet for retentate are located so as to create a horizontal flow of substrate through the tank. Membrane assemblies are located within the horizontal flow of substrate. Aerators as described above are provided and operated as described above.
An aerator for filtering membranes immersed in a liquid to be filtered, comprising:
An aerator for filtering membranes immersed in a tank of liquid, comprising:
The process of any of claim 7 wherein the change between the high flow rate and low flow rate is performed in less than about 6 seconds.
The process of claim 11 wherein the change between the high flow rate and low flow rate is performed in less than about 3 seconds.
The process of claim 14 wherein air flows through the holes of the aerator for between about ⅓ and ¾ of the cycle duration.
The process of claim 15 wherein air flows through the holes for about ½ of the cycle duration.
Dependencies are inferred from the claim text.