Open bottom multiple channel gas delivery device for immersed membranes

Patent metadata

Field	Value
Publication number	US-10765976-B2
Application number	US-201314442807-A
Country	US
Kind code	B2
Filing date	Mar 15, 2013
Priority date	Nov 14, 2012
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

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.

First claim

What is claimed is:

1. 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.

2. 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.

3. 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.

4. The method of claim 1 , wherein an aeration flow rate is varied between successive permeation cycles.

5. The method of claim 1 , wherein air scouring during the permeation cycle comprises releasing a series of bursts of bubbles and an aeration flow rate is increased during a backpulse or relaxation cycle relative to the aeration flow rate during a preceding permeation cycle.

6. The method of claim 1 , wherein an aeration flow rate is increased within a permeation cycle.

7. The method of claim 1 , wherein aeration is provided intermittently during a permeation cycle.

8. The method of claim 1 , wherein aeration is provided only during a backpulse or a relaxation cycle.

9. The method of claim 1 , wherein a continuous or instantaneous aeration flow rate increases generally linearly over time during a permeation cycle.

10. The method of claim 2 , wherein an aeration flow rate is varied between successive permeation cycles.

11. The method of claim 2 , wherein air scouring during the permeation cycle comprises releasing a series of bursts of bubbles and an aeration flow rate is increased during a backpulse or relaxation cycle relative to the aeration flow rate during a preceding permeation cycle.

12. The method of claim 2 , wherein an aeration flow rate is increased within a permeation cycle.

Assignees

• Bl Technologies Inc

Inventors

• Boyle Gavin James
• Alam Zamir
• Bayly Reid
• Theodoulou Michael David
• Zhou Hongde

Classifications

• B01D61/20 Primary

  Accessories; Auxiliary operations · CPC title

• B01D63/02

  Hollow fibre modules · CPC title

• Y02W10/10

  Biological treatment of water, waste water, or sewage · CPC title

• B01D2321/04

  Backflushing · CPC title

• B01D29/663

  by using membranes · CPC title