Open bottom multiple channel gas delivery device for immersed membranes
AssigneeBl Technologies, Inc.
InventorsGavin James Boyle, Zamir Alam, Reid Bayly, Michael David Theodoulou, Hongde Zhou
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Abstract
A method of air scouring an immersed membrane is described in this specification. The method comprising a step of adjusting one or more aeration parameters: between successive permeation, back pulse or relaxation cycles; during a permeation cycle; or, between a permeation cycle and a backpulse or relaxation cycle.
Claims12
A method of air scouring an immersed membrane comprising adjusting one or more aeration parameters:
- between successive permeation, backpulse or relaxation cycles;
- during a permeation cycle;
- or between a permeation cycle and a backpulse or relaxation cycle wherein air scouring during the backpulse or relaxation cycle comprises releasing a series of bursts of bubbles;
- wherein aeration is provided by a gas delivery device comprising:
- a manifold adapted to be connected to a source of a pressurized gas;
- and
- a plurality of open-bottomed channels, each of the plurality of channels having a single outlet and being in fluid communication with the manifold through a distinct associated port.
A method of air scouring an immersed membrane comprising adjusting one or more aeration parameters:
- between successive permeation, backpulse or relaxation cycles;
- during a permeation cycle;
- or between a permeation cycle and a backpulse or relaxation cycle wherein air scouring during the backpulse or relaxation cycle comprises releasing a series of bursts of bubbles;
- wherein aeration is provided by a gas delivery device comprising:
- a distribution plenum adapted to be connected to a source of a pressurized gas;
- and,
- a plurality of channels, each of the plurality of channels being in fluid communication with the distribution plenum through a distinct associated port, each of the plurality of channels having an outlet at the end of the channel adapted to discharge gas,
- wherein the ports have a smaller area than the channels and the ports are located close together relative to a variation in the lengths of the channels.
A method of air scouring an immersed membrane comprising adjusting one or more aeration parameters:
- between successive permeation, backpulse or relaxation cycles;
- during a permeation cycle;
- or between a permeation cycle and a backpulse or relaxation cycle wherein air scouring during the backpulse or relaxation cycle comprises releasing a series of bursts of bubbles;
- and further comprising:
- bringing a flow of pressurized gas into a tank to a manifold near or below the bottom of a membrane module;
- splitting the flow of pressurized gas into multiple flows of pressurized gas extending from the manifold;
- directing each of the multiple flows of pressurized gas to a different lateral position, such that each of the multiple flows of pressurized travel a different distance from the manifold;
- and
- releasing bubbles from the different lateral positions.
Dependencies are inferred from the claim text.