WO2005037414A1 - Novel device for submerged ultrafiltration - Google Patents

Novel device for submerged ultrafiltration Download PDF

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Publication number
WO2005037414A1
WO2005037414A1 PCT/SG2003/000249 SG0300249W WO2005037414A1 WO 2005037414 A1 WO2005037414 A1 WO 2005037414A1 SG 0300249 W SG0300249 W SG 0300249W WO 2005037414 A1 WO2005037414 A1 WO 2005037414A1
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WIPO (PCT)
Prior art keywords
membrane
capillaries
header
membrane device
suspended solids
Prior art date
Application number
PCT/SG2003/000249
Other languages
French (fr)
Inventor
C. H. Krishnamurthi Rao
Original Assignee
Krishnamurthi Rao C H
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Krishnamurthi Rao C H filed Critical Krishnamurthi Rao C H
Priority to AU2003273211A priority Critical patent/AU2003273211A1/en
Priority to PCT/SG2003/000249 priority patent/WO2005037414A1/en
Publication of WO2005037414A1 publication Critical patent/WO2005037414A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/02—Hollow fibre modules
    • B01D63/04—Hollow fibre modules comprising multiple hollow fibre assemblies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/02—Hollow fibre modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/08—Prevention of membrane fouling or of concentration polarisation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1268—Membrane bioreactor systems
    • C02F3/1273—Submerged membrane bioreactors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/23—Specific membrane protectors, e.g. sleeves or screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/04—Backflushing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/16—Use of chemical agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/18—Use of gases
    • B01D2321/185—Aeration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the device is a submerged ultra filtration membrane having capillaries that are (contrary to convention) packed densely in sleeves, which restricts possible damaging movements.
  • the outer side of the device can be kept clean by air scour and the inner capillaries by backwash and/or chemical cleaning.
  • the device can typically be used in applications like the membrane bioreactor for the production of clean water from waste streams or rivers.
  • This invention is a membrane device that improves on membrane filtration of submerged elements.
  • Submerged membrane filtration is a process whereby the permeate (a liquid containing components which should not be present in it) is drawn through a membrane element by a vacuum provided by a pump or by siphoning from hollow porous or semi permeable capillaries which are submerged in said permeate.
  • the separating surface is generally located on the outside of the capillary.
  • the porous semi permeable capillaries usually employed have a 100 nM to 1000 nM micro filtration range pore size, generally referred to as "micro filtration membranes".
  • the capillaries are arranged with a spacing between the capillaries in the potting to prevent touching of the capillaries at the capillary-potting interface.
  • the capillaries are slightly longer than the distance between the headers and therefore can sway relative freely.
  • the air bubbles exert forces which cause a scrubbing action to maintain a clean membrane surface.
  • the devices according to US 52448424 and US RE 37549 as well as US 6325928 have free moving membrane capillaries.
  • the use of air bubbles for cleaning also exerts considerable force on the capillaries. This may also cause membrane breaks.
  • One way of preventing the capillaries from breaking is to use a reinforcement in the capillary as described in US 5472607, especially on the area at the interface of potting and free moving where the capillaries are vulnerable.
  • the forces on the capillaries caused by the air bubbles can also be distributed over more membranes so as to reduce stress on the individual capillaries as well as movements at the potting capillary interface by fixing and or supporting the capillaries with fibres as described in US 5480553 and 5922201. It is . obvious that preparing a woven structure also adds to complexity and cost of a system.
  • the device's relatively densely packed membrane bundles supported by the sleeve not only prevents practically all forces, especially longitudinal forces, but also prevents movement of the membranes at the capillary/poting interface. Consequently, no measures to protect the capillaries from breaking are necessary. Furthermore the capillaries do not need to have the extra length between the headers. They may be of the exact length and are restricted in movement.
  • the use of densely packed bundles of capillaries also simplifies the potting operation , because capillary/capillary contacts are permissible, so one does not have to take care of spacing between the capillaries.
  • the described invention also allows a very high packing density in the element , providing a very high surface area in the device.
  • the distribution of air bubbles between the elements can be achieved by known methods. Since the unwanted forces on the membranes are prevented, the choice of membrane materials is enhanced. Materials that would otherwise give rise to fatigue break due to the continuous movement in the state of the art elements can be successfully used in this design. This implies for instance that the membrane described in US 5076925 by Koenhen et.al. can be used. Also the length between the header is not restricted in any way when the design according the invention is used. The elements can also be used in both the vertical and horizontal ways.
  • a bundle of capillaries 1 is closely held together by a sleeve 2 of a very open material.
  • the sleeve can be made of rigid material such as polypropylene or of a flexible netting material. These materials are very well known in the production of cartridge filters. Alternatively, woven or non- woven cloth may be used. Suitable sleeves can be obtained from companies like Netlon or NSW. The openings in the sleeves should preferably be between 0,3 and 10 mm where the porosity is typically in the order of 50% or higher.
  • the ends of the bundles are potted in such a way that a part of the sleeve 2 is in the potting material. This ensures that movement of the capillaries at the potting interface is impossible.
  • the other end of the potting 3 can be cut off so as to expose the open ends of the capillaries. Headers (single or multiple modules) can be prepared according to procedures well known in the industry and described in several patent descriptions. Schematic examples of such modules are given in figs 2 and 3.
  • Spacing of the elements in the modules allows air bubbles to pass along the elements, maintaining suspension of suspended solids and cleanliness of the sleeve and outer ring of membrane capillaries.
  • the inner capillaries can be cleaned either through backwash or by chemical cleaning. During the backwash the air bubbling remains in function to sweep away suspended solids released from the capillaries during such backwash.
  • the diameter of the bundle and therefore of the device can be chosen in such a way that the hydraulic resistance (pressure drop) for the feed to flow to the centre of the bundle is not detrimental to the flux of the capillary, i.e. the transmembrane pressure in the centre should be adequate to produce sufficient water.
  • the optimum bundle diameter therefore is a function of the desired flux and fibre diameter. This of course is also the case for efficient backwash.
  • the best bundle diameter is between 1 and 20 cm. With capillaries of 2.5 mm outer diameter the optimum element diameter is between 5 and 40 cm.
  • the length 1 of the devices is preferably more than 0.5 m .
  • the filtration area is extended linearly with the length of the devices so that the length can be optimised with reference to the hydraulic pressure loss in the bore of the capillaries. Typically, a length of between 1 m and 2 meters is currently the most appropriate.
  • the device described can be included in a pressure tank where the driving force for permeation is pressure.
  • a pressure tank with means of air scouring is given in Singapore patent 200003859-6 by Dr. CH. Krishnamurthi Rao et.al.
  • a membrane bioreactor module containing 8 elements with a diameter of 110 mm and a length of 1500 mm according to the description was entered into a tank containing sewage. Air was bubbled from the bottom. Further details are given in table 1
  • Results of the trial are listed in table 2. As can be seen very good results have been achieved and at stable flux of 20-30 l/m2/hr.

Abstract

The device is a submerged ultra filtration membrane having capillaries that are packed in porous, supporting sleeves, which restricts possible damaging movements. An advantage of this is that the membranes may be more tightly packed. The outer side of the device can be kept clean by air scour and the inner capillaries by backwash and/or chemical cleaning. The device can typically be used in applications like the membrane bioreactor for the production of clean water from waste streams or rivers.

Description

NOVEL DEVICE FOR SUBMERGED ULTRAFILTRATION
Summary
The device is a submerged ultra filtration membrane having capillaries that are (contrary to convention) packed densely in sleeves, which restricts possible damaging movements. The outer side of the device can be kept clean by air scour and the inner capillaries by backwash and/or chemical cleaning. The device can typically be used in applications like the membrane bioreactor for the production of clean water from waste streams or rivers.
Background of the invention
This invention is a membrane device that improves on membrane filtration of submerged elements. Submerged membrane filtration is a process whereby the permeate (a liquid containing components which should not be present in it) is drawn through a membrane element by a vacuum provided by a pump or by siphoning from hollow porous or semi permeable capillaries which are submerged in said permeate. By nature the separating surface is generally located on the outside of the capillary. The porous semi permeable capillaries usually employed, have a 100 nM to 1000 nM micro filtration range pore size, generally referred to as "micro filtration membranes".
One of the practical issues in membrane filtration is the problem of flux loss due to fouling of the membrane capillaries. In non-submerged filtration devices, where capillaries are in a fixed housing and where the permeation is generally brought about by pressure, this problem is generally counteracted by causing turbulence at the membrane surface, for instance by the high speed of the feed solution. In many cases, a backwash is also incorporated as part of the operation. A description of a submerged device is given in US 5248424 by P.Cote et.al. where the capillaries are arranged in loose skeins and air bubbles are used to keep the capillaries clean for a longer period. An improvement on the above patent is given in US RE 37549 by Mailvaganan et.al.. Here the capillaries are arranged with a spacing between the capillaries in the potting to prevent touching of the capillaries at the capillary-potting interface. The capillaries are slightly longer than the distance between the headers and therefore can sway relative freely. The air bubbles exert forces which cause a scrubbing action to maintain a clean membrane surface.
The state of the art submerged devices however pose some problems which are solved by the present invention.
The devices according to US 52448424 and US RE 37549 as well as US 6325928 have free moving membrane capillaries. This means that the material of the capillaries has to be very flexible. This reduces the number of polymers to be used for manufacturing the membrane considerably, because materials which may be vulnerable towards fatigue breaks due to the flexing cannot be used. The use of air bubbles for cleaning also exerts considerable force on the capillaries. This may also cause membrane breaks. One way of preventing the capillaries from breaking is to use a reinforcement in the capillary as described in US 5472607, especially on the area at the interface of potting and free moving where the capillaries are vulnerable.
In US RE 37549 measures like adding an extra soft layer of polyurethane are described. All these measures however add cost to the device.
The forces on the capillaries caused by the air bubbles can also be distributed over more membranes so as to reduce stress on the individual capillaries as well as movements at the potting capillary interface by fixing and or supporting the capillaries with fibres as described in US 5480553 and 5922201. It is . obvious that preparing a woven structure also adds to complexity and cost of a system.
Another problem in the existing designs is that course material present in the feed solution, like hair can be trapped between the membranes because of the movement and spacing of the membranes. This is generally very difficult to remove.
Summary of the invention
With this submerged membrane filtration device, where a bundle of capillaries is held together by a open sleeve or casing, very good results have been obtained. By reason of the capillaries being densely packed in this configuration, it has been shown that coarse materials like hair are filtered by the sleeve or outer ring of capillaries so that these materials cannot intrude in the inner section of the membrane element. The sleeve and outer ring of membranes is kept clean by air bubbles. This keeps the suspended solids in a state of suspension and simultaneously maintains a feed flow along the elements containing the capillaries.
The device's relatively densely packed membrane bundles supported by the sleeve not only prevents practically all forces, especially longitudinal forces, but also prevents movement of the membranes at the capillary/poting interface. Consequently, no measures to protect the capillaries from breaking are necessary. Furthermore the capillaries do not need to have the extra length between the headers. They may be of the exact length and are restricted in movement. The use of densely packed bundles of capillaries also simplifies the potting operation , because capillary/capillary contacts are permissible, so one does not have to take care of spacing between the capillaries. The described invention also allows a very high packing density in the element , providing a very high surface area in the device.
Several of the devices can be combined into a module to generate a filtration surface area which is a multiple of the number of devices used. In larger systems it is obvious that multiples of modules can be used to achieve the filtration area required.
The distribution of air bubbles between the elements can be achieved by known methods. Since the unwanted forces on the membranes are prevented, the choice of membrane materials is enhanced. Materials that would otherwise give rise to fatigue break due to the continuous movement in the state of the art elements can be successfully used in this design. This implies for instance that the membrane described in US 5076925 by Koenhen et.al. can be used. Also the length between the header is not restricted in any way when the design according the invention is used. The elements can also be used in both the vertical and horizontal ways.
With current technology, the capillaries further inside the bundle are not reached by the air bubbles. Consequently, the cleaning has to be effected by regular backwash. This backwash is effective only with membranes which have a clean water productivity of less than 1500 l/m2/h/bar. This is because the backwash water has to be fed through the bore of the capillary and for a certain length one has to take account of pressure drop. In a micro filtration membrane with a pore size of 0,5 micron the flux can be as high as 50000 l/m2/bar. Using such a membrane would mean that because of the limited amount of water that can be fed to the bore, all the water may pass through a small portion of clean membrane while the rest of the membrane remains fouled. This phenomenon can be compared with the channelling effect known from multi-media filters.
In the present invention it has been shown that an element with a bore size of 0,8 mm and a diameter of 110 mm and a length of 1.5 m , fitted with capillaries with a clean water flux of 800 l/m2/h/bar can be successfully cleaned over the total length by backwashing during a long term trial in a municipal waste water application.
The restriction in clean water flux adds an additional advantage to this invention because of the fact that known membranes possessing the flux characteristics are generally to be found in the ultra filtration range of pore sizes. This means that besides a total removal of bacteria there is also a very substantial removal of vims particles.
The importance of this fact is obvious when the device is to be used in waste water treatment.
Detailed description of the invention
A bundle of capillaries 1 is closely held together by a sleeve 2 of a very open material. The sleeve can be made of rigid material such as polypropylene or of a flexible netting material. These materials are very well known in the production of cartridge filters. Alternatively, woven or non- woven cloth may be used. Suitable sleeves can be obtained from companies like Netlon or NSW. The openings in the sleeves should preferably be between 0,3 and 10 mm where the porosity is typically in the order of 50% or higher.
The ends of the bundles are potted in such a way that a part of the sleeve 2 is in the potting material. This ensures that movement of the capillaries at the potting interface is impossible. The other end of the potting 3 can be cut off so as to expose the open ends of the capillaries. Headers (single or multiple modules) can be prepared according to procedures well known in the industry and described in several patent descriptions. Schematic examples of such modules are given in figs 2 and 3.
Spacing of the elements in the modules allows air bubbles to pass along the elements, maintaining suspension of suspended solids and cleanliness of the sleeve and outer ring of membrane capillaries.
The inner capillaries can be cleaned either through backwash or by chemical cleaning. During the backwash the air bubbling remains in function to sweep away suspended solids released from the capillaries during such backwash.
The diameter of the bundle and therefore of the device can be chosen in such a way that the hydraulic resistance (pressure drop) for the feed to flow to the centre of the bundle is not detrimental to the flux of the capillary, i.e. the transmembrane pressure in the centre should be adequate to produce sufficient water.
The optimum bundle diameter therefore is a function of the desired flux and fibre diameter. This of course is also the case for efficient backwash. We have found that with capillaries with a diameter of 1.2 mm, the best bundle diameter is between 1 and 20 cm. With capillaries of 2.5 mm outer diameter the optimum element diameter is between 5 and 40 cm. The length 1 of the devices is preferably more than 0.5 m . The filtration area is extended linearly with the length of the devices so that the length can be optimised with reference to the hydraulic pressure loss in the bore of the capillaries. Typically, a length of between 1 m and 2 meters is currently the most appropriate.
In another embodiment, the device described can be included in a pressure tank where the driving force for permeation is pressure. An example of such a tank with means of air scouring is given in Singapore patent 200003859-6 by Dr. CH. Krishnamurthi Rao et.al.
Example
A membrane bioreactor module containing 8 elements with a diameter of 110 mm and a length of 1500 mm according to the description was entered into a tank containing sewage. Air was bubbled from the bottom. Further details are given in table 1
Table 1
DETAILS OFMBR DESIGN PARAMETERS
MOC OF POLYMERIC MEMBRANE PES
MWCO 150-250 KD
MBR DESIGN CAPACITY 1000 LPH
MEMBRANE AREA 40 M2
DESIGN FLUX 25 LMH
MODE OF OPERATION OUT TO IN
OPERATION DETAILS FLUX 20 - 30 LMH
DRIVING FORCE VACUUM MODE BACKWASH INTERVAL 20-30 MINUTES BACKWASH DURATION 30 SECONDS CHEMICALS CLEANING FREQUENCY : ONCE PER WEEK RECOMMENDED CLEANING CHEMICAL :HYPO/CAUSTIC/CITRIC
Results of the trial are listed in table 2. As can be seen very good results have been achieved and at stable flux of 20-30 l/m2/hr.
Table 2
Figure imgf000009_0001

Claims

ClaimsWhat we claim is:
1. An ultra filtration device for withdrawing permeate essentially continuously from a fluid containing suspended solids, while increasing the concentration of suspended solids therein by a driving transmembrane pressure caused by a vacuum, said membrane device including: A. A multiplicity of capillary membranes confined in a porous sleeve restricting the movement of the capillaries. B. A first header and a second header in transversely spaced relationship with at least one header within the fluid containing the suspended solids. C. At least one header with the open ends of the capillaries extending in the header to a permeate discharge. D. A gas distribution means near the lowest point of the total assembly, adapted to generate bubbles flowing around the device which keeps the sleeve and exposed portions of the outer capillaries clean.
2. The membrane device of claim 1 whereby the capillary membrane is an ultra filtration membrane of a polymeric material with a cut-off of between 3000 Dalton and 200.000 Dalton.
3. The membrane device of claim 1 where the diameter of the capillaries is between 0.1 and 5 mm..
4. The membrane device of claim 1 wherein the device is placed vertical.
5. The membrane device of claim 1 wherein the device is place horizontal.
6. The membrane device of claim 1 wherein a cleaning of the majority of capillaries is achieved through backwashing or by chemical cleaning.
7. A module consisting of several membrane devices according to claim 1 to form a module.
8. A system according to claim 7 in which the gas distribution system is separate from the module.
9. An ultra filtration device for withdrawing permeate essentially continuously from a fluid containing suspended solids, while increasing the concentration of suspended solids therein by a driving transmembrane pressure caused by a pressure, said membrane device including: A. A multiplicity of capillary membranes confined in a porous sleeve restricting the movement of the capillaries. B. A first header and a second header in transversely spaced relationship with at least one header within the fluid containing the suspended solids. C. At least one header with the open ends of the capillaries extending in the header to a permeate discharge. D. A gas distribution means near the lowest point of the total assembly, adapted to generate bubbles flowing around the device which keeps the sleeve and exposed portions of the outer capillaries clean. E. A pressure vessel to contain the device or a multiplicity of devices.
10. The membrane device of claim 9 whereby the capillary membrane is an ultra filtration membrane of a polymeric material with a cut-off of between 3000 Dalton and 200.000 Dalton.
11. The membrane device of claim 9 where the diameter of the capillaries is between 0.1 and 5 mm..
12. The membrane device of claim 9 wherein the device is placed vertical.
13. The membrane device of claim 9 wherein the device is place horizontal.
14. The membrane device of claim wherein a cleaning of the majority of capillaries is achieved through backwashing or by chemical cleaning.
15. Membrane devices according to claim 1 and 9 where the air scouring is continuous.
16. Membrane devices according to claim 1 and 9 where the air scouring is discontinuous.
PCT/SG2003/000249 2003-10-20 2003-10-20 Novel device for submerged ultrafiltration WO2005037414A1 (en)

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Cited By (30)

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US7938966B2 (en) 2002-10-10 2011-05-10 Siemens Water Technologies Corp. Backwash method
US8048306B2 (en) 1996-12-20 2011-11-01 Siemens Industry, Inc. Scouring method
US8268176B2 (en) 2003-08-29 2012-09-18 Siemens Industry, Inc. Backwash
US8287743B2 (en) 2007-05-29 2012-10-16 Siemens Industry, Inc. Membrane cleaning with pulsed airlift pump
US8293098B2 (en) 2006-10-24 2012-10-23 Siemens Industry, Inc. Infiltration/inflow control for membrane bioreactor
US8318028B2 (en) 2007-04-02 2012-11-27 Siemens Industry, Inc. Infiltration/inflow control for membrane bioreactor
US8377305B2 (en) 2004-09-15 2013-02-19 Siemens Industry, Inc. Continuously variable aeration
US8382981B2 (en) 2008-07-24 2013-02-26 Siemens Industry, Inc. Frame system for membrane filtration modules
US8496828B2 (en) 2004-12-24 2013-07-30 Siemens Industry, Inc. Cleaning in membrane filtration systems
US8506806B2 (en) 2004-09-14 2013-08-13 Siemens Industry, Inc. Methods and apparatus for removing solids from a membrane module
US8512568B2 (en) 2001-08-09 2013-08-20 Siemens Industry, Inc. Method of cleaning membrane modules
US8518256B2 (en) 2001-04-04 2013-08-27 Siemens Industry, Inc. Membrane module
US20130264251A1 (en) * 2007-04-04 2013-10-10 Siemens Membrane module protection
US8758622B2 (en) 2004-12-24 2014-06-24 Evoqua Water Technologies Llc Simple gas scouring method and apparatus
US8758621B2 (en) 2004-03-26 2014-06-24 Evoqua Water Technologies Llc Process and apparatus for purifying impure water using microfiltration or ultrafiltration in combination with reverse osmosis
US8790515B2 (en) 2004-09-07 2014-07-29 Evoqua Water Technologies Llc Reduction of backwash liquid waste
US8808540B2 (en) 2003-11-14 2014-08-19 Evoqua Water Technologies Llc Module cleaning method
US8858796B2 (en) 2005-08-22 2014-10-14 Evoqua Water Technologies Llc Assembly for water filtration using a tube manifold to minimise backwash
US8956464B2 (en) 2009-06-11 2015-02-17 Evoqua Water Technologies Llc Method of cleaning membranes
US9022224B2 (en) 2010-09-24 2015-05-05 Evoqua Water Technologies Llc Fluid control manifold for membrane filtration system
US9533261B2 (en) 2012-06-28 2017-01-03 Evoqua Water Technologies Llc Potting method
US9604166B2 (en) 2011-09-30 2017-03-28 Evoqua Water Technologies Llc Manifold arrangement
US9675938B2 (en) 2005-04-29 2017-06-13 Evoqua Water Technologies Llc Chemical clean for membrane filter
US9815027B2 (en) 2012-09-27 2017-11-14 Evoqua Water Technologies Llc Gas scouring apparatus for immersed membranes
US9914097B2 (en) 2010-04-30 2018-03-13 Evoqua Water Technologies Llc Fluid flow distribution device
US9925499B2 (en) 2011-09-30 2018-03-27 Evoqua Water Technologies Llc Isolation valve with seal for end cap of a filtration system
US9962865B2 (en) 2012-09-26 2018-05-08 Evoqua Water Technologies Llc Membrane potting methods
US10322375B2 (en) 2015-07-14 2019-06-18 Evoqua Water Technologies Llc Aeration device for filtration system
US10427102B2 (en) 2013-10-02 2019-10-01 Evoqua Water Technologies Llc Method and device for repairing a membrane filtration module
CN116750874A (en) * 2023-08-11 2023-09-15 水木清环(北京)环保科技有限公司 MBR membrane pond and sewage treatment environmental protection equipment

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Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8048306B2 (en) 1996-12-20 2011-11-01 Siemens Industry, Inc. Scouring method
US8518256B2 (en) 2001-04-04 2013-08-27 Siemens Industry, Inc. Membrane module
US8512568B2 (en) 2001-08-09 2013-08-20 Siemens Industry, Inc. Method of cleaning membrane modules
US7938966B2 (en) 2002-10-10 2011-05-10 Siemens Water Technologies Corp. Backwash method
US8268176B2 (en) 2003-08-29 2012-09-18 Siemens Industry, Inc. Backwash
US8808540B2 (en) 2003-11-14 2014-08-19 Evoqua Water Technologies Llc Module cleaning method
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