AU2001291514A1 - Improved membrane filtration system - Google Patents
Improved membrane filtration systemInfo
- Publication number
- AU2001291514A1 AU2001291514A1 AU2001291514A AU2001291514A AU2001291514A1 AU 2001291514 A1 AU2001291514 A1 AU 2001291514A1 AU 2001291514 A AU2001291514 A AU 2001291514A AU 2001291514 A AU2001291514 A AU 2001291514A AU 2001291514 A1 AU2001291514 A1 AU 2001291514A1
- Authority
- AU
- Australia
- Prior art keywords
- filtration system
- membrane filtration
- filler
- membranes
- volume
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 238000005374 membrane filtration Methods 0.000 title claims description 21
- 239000000945 filler Substances 0.000 claims description 50
- 239000012528 membrane Substances 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 24
- 239000000835 fiber Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 5
- 230000000295 complement effect Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 239000002991 molded plastic Substances 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000005755 formation reaction Methods 0.000 claims 1
- 238000001914 filtration Methods 0.000 description 13
- 239000007789 gas Substances 0.000 description 6
- 239000012535 impurity Substances 0.000 description 4
- 238000009991 scouring Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000011001 backwashing Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Description
TITLE: IMPROVED MEMBRANE FILTRATION SYSTEM
FIELD OF THE INVENTION
The present invention relates to membrane filtration systems, and more particularly to those systems employing porous or permeable membranes located in a tank or cell open to atmosphere.
BACKGROUND ART
Any discussion of the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of common general knowledge in the field.
Porous membrane filtration systems require regular backwashing of the membranes to maintain filtration efficiency and flux while reducing transmembrane pressure (TMP) which rises as the membrane pores become clogged with impurities. Typically, during the backwash cycle the impurities are forced out of the membrane pores by pressurised gas, liquid or both into the feed tank or cell. The liquid containing impurities and deposits from the membranes is then drained or flushed from the tank.
The waste liquid displaced from the tank needs to be disposed of or reprocessed, usually in an environmentally safe manner, so any reduction in the volume of such waste liquid is seen as advantageous in terms of environmental impact and cost.
The draining or flushing of the tank, particularly when large arrays of membranes are used also requires time which results in down time of the
filtration cycle. In order to reduce this down time large pumping systems are required to quickly drain and refill the tank. Where tanks or cells are arranged in banks and feed is used to refill the tank, a lowering in levels in other cells may be produced during the refill process. This again impinges on operating efficiency of the filtration system.
Further, in filtration systems employing gas bubble scouring of the membranes it has been found advantageous to confine the bubbles as much as possible in the region of the membranes to assist with the scouring process.
Reduction in backwash volume also reduces the volume of chemical cleaning agents required in some systems. This has the two-fold advantage of reducing cost in terms of chemical requirements while also reducing waste disposal problems.
It has been found advantageous to reduce the volume of feed liquid in the filtration cell to ameliorate the above problems and provide at least some of the advantages outlined above.
DISCLOSURE OF THE INVENTION
The present invention seeks to overcome one or more of the abovementioned problems of the prior art, provide one or more of the advantages outlined above or at least provide a useful alternative by reducing the feed volume presented to the porous membranes in a simple, cost effective manner.
According to one aspect, the present invention provides a method of reducing volume of feed liquid required in a membrane filtration system having a number of porous membranes submersed in a volume of feed liquid to be filtered, the method comprising the step of providing filler elements within said volume of feed liquid to be filtered.
Preferably, the filler elements substantially fill voids between the porous membranes while still permitting liquid flow communication with the membranes.
According to another aspect, the present invention provides a membrane filtration system having a number of porous membranes submersed in a volume of feed liquid to be filtered, wherein one or more filler members are provided in voids between said membranes to reduce said volume.
In one preferred form the membranes are porous hollow fibre membranes arranged in bundles to form membrane modules. The modules are submersed in a liquid volume provided in a tank or cell open to atmospheric pressure. In this form of the invention, the voids between the modules are at least partially filled by a filler member or members.
Preferably, the filler members are each formed of a number of elements which fit together to form an integral unit. This enables the filler members to be assembled around the membranes modules without the need for removal of the modules. This assists in initial set-up as well as with replacement and maintenance regimes.
The filler elements may comprise spheres, preferably hollow, which can be packed around the membranes to fill the voids. The spheres are preferably
sized to avoid blocking or passing through any of the inlet/outlet ports or valves
associated with the filtration system.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
Figure 1 shows a perspective view of a bank of filtration modules having filler members according to one embodiment of the invention;
Figure 2 shows an enlarged perspective view of the upper portion of the
bank of filtration modules of Figure 1 ; Figure 3 shows an exploded view of the filler members of Figure 1 as they
would be assembled around a filtration module;
Figure 4 shows an end elevation view of a central filler member of Figure
3;
Figure 5 shows a side elevation view of the filler member of Figure 4; Figure 6 shows a perspective view of the filler member of Figure 4;
Figure 7 shows a plan view of the filler member of Figure 4;
Figure 8 shows an end elevation view of side filler member of Figure 3;
Figure 9 shows a side elevation view of the filler member of Figure 8;
Figure 10 shows a perspective view of the filler member of Figure 8;
Figure 1 1 shows a plan view of the filler member of Figure 8; and
Figure 12 shows a graph of transmembrane pressure over a period of time
for two types of filtration system with a filler system being employed on one
system part way through the test period. DESCRIPTION OF PREFERRED EMBODIMENTS
Referring to the drawings, the embodiments will be described in relation to a manifold and filtration system disclosed in our co-pending PCT Application No. WO 00/62908 (which is incorporated herein by cross-reference), however, it will be appreciated that the invention is equally applicable to other forms of filtration system requiring similar advantages.
The system includes a bank 5 of filter submodules 6 each attached in groups to a membrane filtration manifold 7. In this embodiment, the submodules 6 comprise elongate bundles of porous hollow fibre membranes (not shown) typically enclosed by a supporting cage (not shown). The submodules 6 are positioned within a feed tank or cell (not shown) and when the tank is filled the sub-modules are immersed in feed liquid. Each manifold 7 is connected to a filtrate conduit 8 for removal of filtrate.
During the backwash process, the fibre bundles of submodules 6 are cleaned externally by air bubbles or a mixture of air/liquid injected into each submodule to scrub the outer surfaces of the fibre membranes. The submodules 6 may also be further cleaned by backwashing liquid and/or gas through the fibre pores.
In accordance with this embodiment, in order to reduce backwash volume, each submodule 6 is encased partially by a number of filler members 9 which are segmented to allow each to fit closely around the elongate fibre bundles. In this embodiment, the filler members 9 are spaced from the upper and lower manifolds 7 to allow for flow of liquid and/or impurities in and out of the submodules 6. It will be appreciated that other arrangements to allow liquid flow can also be employed, for example, the filler members 9 could be spaced radially from the outer periphery of each fibre bundle submodule 6 or various
shapes of filler member 9 could be used which allowed for liquid flow to and from the submodule 6 while still substantially filling the voids between each submodule 6.
In this system, which employs a gas bubble scouring method, the use of the filler members 9 provides an additional advantage of confining the gas bubbles within the submodules 6 and thus improving scouring efficiency.
As best shown in Figures 3 to 11 , the filler members 9 are formed from complementary segments comprising a central or core element 10 having two sets of parallel opposed semi-circular, in cross-section, channels 11 extending longitudinally along the length of the central element 10. The channels 11 have a diameter sized to accommodate and fit closely around the submodule 6. The sides 12 and inner edge 13 of the element 10 are provided with outwardly extending tabs or bosses 14 which mate with complementary slots 15 on other filler segments 16 to provide, in use, an integral filler member 9. The side filler segments 16 are generally T-shaped in cross-section with half-semi circular sides 17 of the same diameter as the central element 10.
The top and bottom surface 18 of the central element 10 are provided with a spacer peg 19 which positions the filler element 9 in a spatial relationship from the manifold 7 to allow fluid flow to and from the top and bottom of the fibre bundles.
The filler members 9 are desirably formed from material which is resistant to any destructive substances present in the feed stream as well as chemicals, gases, etc. which may be used in the backwash or other cleaning processes. The filler members 9 are also desirably of neutral buoyancy so they will remain in position during submersion of the submodules in the feed tank. They can be
formed from foamed plastics material such as polyethylene foam or blow or rotor moulded plastic. When blow-moulded, the filler elements may be hollow to allow for filling with a fluid (usually water) to produce the required neutral buoyancy. Figure 12 shows the effect on the transmembrane pressure characteristics of two filtration machines. The upper graph shows a machine without the filler members whereas the lower graph shows a machine with filler members employed part way through the test cycle. This graph demonstrates the improved effectiveness of the backwash when filler members are employed. It will be appreciated that further embodiments and exemplifications of the invention are possible without departing from the spirit or scope of the invention described.
Claims (15)
1. A method of reducing volume of feed liquid required in a porous membrane filtration system having a number of porous membranes submersed in a volume of feed liquid to be filtered, the method comprising the step of providing filler elements within said volume of feed liquid to be filtered.
2. A method according to claim 1 wherein the filler elements substantially fill voids between the porous membranes while still permitting liquid flow communication with the membranes.
3. A membrane filtration system having a number of porous membranes submersed in a volume of feed liquid to be filtered, wherein one or more filler members are provided in voids between said membranes to reduce said volume.
4. A membrane filtration system according to claim 3 wherein the membranes are porous hollow fibre membranes arranged in bundles to form membrane modules.
5. A membrane filtration system according to claim 4 wherein the modules are submersed in a liquid volume provided in a tank or cell open to atmospheric pressure.
6. A membrane filtration system according to claim 4 or 5 wherein the voids between the modules are at least partially filled by the filler member or members.
7. A membrane filtration system according to claim 3 wherein the filler members are each formed of a number of elements which fit together to form an integral unit.
8. A membrane filtration system according to claim 3 wherein said filler members are neutrally buoyant with respect to said feed liquid.
9. A membrane filtration system according to claim 3 wherein said filler members are spherical in shape.
10. A membrane filtration system according to claim 8 or claim 9 wherein said filler elements are hollow and adapted to be filled with a fluid to provide said neutral buoyancy.
11. A membrane filtration system according to claim 4 wherein the filler member is formed from complementary segments comprising a central element having two sets of parallel opposed semi-circular, in cross-section, channels extending longitudinally along the length of the central element, each channel have a diameter sized to accommodate and fit closely around the fibre bundles, and side filler segments of generally T-shaped cross-section with half-semi circular sides of the same diameter as said channels adapted to engage with said central element to form said filler member.
12. A membrane filtration system according to claim 11 wherein each filler member includes complementary engagement formations for engaging with associated engagement means on other filler members.
13. A membrane filtration system according to claim 3 wherein the filler member is formed of foamed plastics material.
14. A membrane filtration system according to claim 3 wherein the filler member is formed of blow-moulded plastics material.
15. A membrane filtration system according to claim 3 wherein the filler member is formed of rotor-moulded plastics material.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPR0648A AUPR064800A0 (en) | 2000-10-09 | 2000-10-09 | Improved membrane filtration system |
| AUPR0648 | 2000-10-09 | ||
| AU9151401A AU9151401A (en) | 2000-10-09 | 2001-10-03 | Improved membrane filtration system |
| PCT/AU2001/001248 WO2002030550A1 (en) | 2000-10-09 | 2001-10-03 | Improved membrane filtration system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2001291514A1 true AU2001291514A1 (en) | 2002-06-27 |
| AU2001291514B2 AU2001291514B2 (en) | 2006-11-09 |
Family
ID=3824706
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AUPR0648A Abandoned AUPR064800A0 (en) | 2000-10-09 | 2000-10-09 | Improved membrane filtration system |
| AU2001291514A Ceased AU2001291514B2 (en) | 2000-10-09 | 2001-10-03 | Improved membrane filtration system |
| AU9151401A Pending AU9151401A (en) | 2000-10-09 | 2001-10-03 | Improved membrane filtration system |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AUPR0648A Abandoned AUPR064800A0 (en) | 2000-10-09 | 2000-10-09 | Improved membrane filtration system |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU9151401A Pending AU9151401A (en) | 2000-10-09 | 2001-10-03 | Improved membrane filtration system |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US6872305B2 (en) |
| EP (2) | EP1328335B1 (en) |
| JP (2) | JP3917937B2 (en) |
| CN (1) | CN1224450C (en) |
| AT (2) | ATE489159T1 (en) |
| AU (3) | AUPR064800A0 (en) |
| CA (2) | CA2424590C (en) |
| DE (2) | DE60143550D1 (en) |
| MY (1) | MY129690A (en) |
| NZ (1) | NZ525149A (en) |
| WO (1) | WO2002030550A1 (en) |
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- 2001-10-03 DE DE60143550T patent/DE60143550D1/en not_active Expired - Lifetime
- 2001-10-03 AU AU2001291514A patent/AU2001291514B2/en not_active Ceased
- 2001-10-03 AU AU9151401A patent/AU9151401A/en active Pending
- 2001-10-03 EP EP01971515A patent/EP1328335B1/en not_active Expired - Lifetime
- 2001-10-03 AT AT05021957T patent/ATE489159T1/en not_active IP Right Cessation
- 2001-10-03 DE DE60116356T patent/DE60116356T2/en not_active Expired - Lifetime
- 2001-10-03 WO PCT/AU2001/001248 patent/WO2002030550A1/en not_active Ceased
- 2001-10-03 CN CNB018171036A patent/CN1224450C/en not_active Expired - Fee Related
- 2001-10-03 CA CA002424590A patent/CA2424590C/en not_active Expired - Fee Related
- 2001-10-03 EP EP05021957A patent/EP1618946B1/en not_active Expired - Lifetime
- 2001-10-03 NZ NZ525149A patent/NZ525149A/en not_active IP Right Cessation
- 2001-10-03 CA CA2683000A patent/CA2683000C/en not_active Expired - Fee Related
- 2001-10-03 AT AT01971515T patent/ATE314134T1/en not_active IP Right Cessation
- 2001-10-09 MY MYPI20014696A patent/MY129690A/en unknown
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2003
- 2003-04-02 US US10/406,807 patent/US6872305B2/en not_active Expired - Lifetime
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2006
- 2006-10-17 JP JP2006282736A patent/JP4617285B2/en not_active Expired - Fee Related
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