TREA

Methods of minimising the effect of integrity loss in hollow fibre membrane modules

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Information

  • Patent Grant
  • 8182687
  • Patent Number
    8,182,687
  • Date Filed
    Wednesday, January 30, 2008
    16 years ago
  • Date Issued
    Tuesday, May 22, 2012
    12 years ago
Information
Abstract
A method and apparatus for reducing the effect of integrity loss in a hollow fiber membrane module, said module including a plurality of hollow fiber membranes (5), at least one end of the fiber membranes (5) being supported in a pot (6), the method including the step of increasing flow resistance of the liquid through the lumen (8) of the fiber membrane (5) in the region of the pot (6).
Description
FIELD OF THE INVENTION

The present invention relates to membrane filtration systems and in particular to system using a plurality of porous hollow fibre membranes wherein loss of membrane integrity can lead to degradation of filtration performance.


BACKGROUND OF THE INVENTION

Consider a typical hollow fibre membrane module as shown in FIG. 1. The module consists of plurality of hollow fibre membranes 5 potted at least at one end into a pot 6 having a length L. In order to calculate the flow from individual fibres the TMP (Transmembrane pressure P1-P2) is considered as acting across a total module resistance R to give a flow Q:

TMP/RαQ (at constant temperature)

Now in this typical model we can break the resistance down into:

R=Rm+Rpot
and QiαTMP/(Rm+Rpot)

where Qi is the flow emerging from the top of the intact fibre, Rm is the module resistance and Rpot is the resistance across the pot.


We can assume Rm is constant—a sort of average—though it will vary down the length of the fibre.


Now taking the case where a fibre is broken at the top pot (a worst case for filtrate bypass). In this case:

Rm=0
and QbαTMP/Rpot

where Qb is the flow of filtrate emerging from the top of the broken fibre.


The ratio of the flow down a broken fibre to the flow down an intact fibre is calculated as follows:






 




=



Q
b

/

Q
i


=

⁢


(


R
m

+

R
pot


)

/

R
pot









=

⁢

1
+


R
m

/

R
pot











In the normal case Rm>>Rpot—typically 20. Thus it can be seen a broken fibre allows a significant amount of feed to contaminate the filtrate and thus degrade filtration performance. Additionally, increasing the internal diameter of the fibre makes the problem massively worse as typically RpotαL/d4, where d is the diameter of the lumen and L is the length of the pot.


Accordingly, it is desirable to reduce the flow of filtrate from a broken fibre. Take the case where we increase Rpot (for instance by increasing L or reducing d). The limit of Qb/Qi tends to 1. This is a highly desirable result. But increasing the length of the pot is undesirable in other ways—it increases the length of the module and the expense of the module and process. The other option is to reducing the internal diameter of the fibre in the pot.


SUMMARY OF THE INVENTION

It is an object of the present invention to overcome or at least ameliorate the problems of the prior art associated with integrity loss in hollow fibre membrane filtration systems or at least provide a useful alternative.


According to one aspect, the present invention provides a method of reducing the effect of integrity loss in a hollow fibre membrane module, said module including a plurality of hollow fibre membranes, at least one end of said fibre membranes being supported in a pot, the method including the step of increasing flow resistance of the liquid through the lumen of the fibre membrane in the region of the pot.


Preferably, the step of increasing the flow resistance is produced by reducing the inner cross-sectional area of the fibre lumen in the region of the pot. For preference, the step of increasing the flow resistance is produced by placing a porous layer in the flow path of the fibre lumen in the region of the pot.


According to a second aspect, the present invention provides a hollow fibre membrane module including a plurality of hollow fibre membranes supported at least at one end in a pot and having flow restriction means in the lumens of said fibre membranes in the region of said pot.


Preferably, the flow restriction means comprise means for reducing the inner cross-sectional area of the fibre lumen in the region of the pot.





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:



FIG. 1 is a schematic sectional elevation of a typical hollow fibre membrane module with an intact and broken fibre;



FIG. 2 is a similar view to FIG. 1 with the addition of a porous layer to the pot surface;



FIGS. 3A to 3K show enlarged schematic cross-sectional elevations of various embodiments of the invention; and



FIG. 4 shows the results of a test performed on two modules to illustrate the operation of the invention.





DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 2 of the drawings, one preferred embodiment of the invention is illustrated. A sinter or porous layer 10 is placed on top of the pot 6 to provide a further series resistance Rpot2 to the pot i.e.

Rpot=Rpot1+Rpot2


An appropriate sinter 10 may have openings of microns in dimension and only be a few millimeters thick. This method may reduce the Qb/Qi by a factor of 10.


Such an arrangement provides added benefits when used for membrane filter systems in a bio-reactor. The high solids feed in bio reactors leads to the sludge actually plugging the filter and self sealing the broken fibre totally.


The may be extended to the general case by replacing the sinter with a membrane with the same pore size as the hollow fibre membrane and enabling achievement of this self plugging capability even with low solids feeds.


It will be apparent the extra resistance of the sinter or membrane 10 will require an extra pressure to maintain the module filtrate flow, however, this is only an operating cost not a membrane process operating efficiency as it is operating over the pot assembly, not across the compressible dirt layer on the membrane.


Fouling of this membrane sinter can be reduced by a regular chemical cleaning backwash with chlorine or other suitable cleaners.


The membrane/sinter 10 is desirably in intimate contact with the pot 6 to prevent sideways flow of filtrate/feed bypass. This may also be achieved with a replaceable sinter/membrane element.


A highly asymmetric membrane 10 with the large pore side contacting the pot 6 (so in normal filtrate flow the filtrate flows in the direction of reducing pore size) is desirable.


As shown in FIGS. 3B-3K a variety of methods may be used to increase the pot flow resistance.


Referring to FIG. 3A a normal pot 6 without modification is shown. FIG. 3B shows an increased length pot 6 which, while increasing pot flow resistance, has other disadvantages.



FIG. 3C illustrates providing the fibre 5 with a non porous coating 7 adjacent the interface 8 between the fibre 5 and the pot 6. This serves to increase pot flow resistance while also moving the fibre failure point away from the fibre-pot interface.



FIGS. 3D and 3E show a further method of reducing flow by reducing the inner diameter of the fibre lumen 8 using a layer of material 9 applied to part or whole of the inner surface 11 of the fibre lumen 8 in the region encompassed by the pot 6.


One method of providing such a layer 9 is to coat the inside of the lumen 8 near the end of the pot 6 with a thin layer of material that effectively reduces the diameter of the fibre lumen 8 at this point. This can be achieved by drawing up a material such as epoxy into the end of the fibre lumen 8 and then allowing it to run out again before it has time to set, leaving behind a thin coating 9 on the inner fibre lumen wall 12 that can then set over time.


The embodiment shown in FIG. 3F illustrates smearing the surface of the pot with a suitable grout material 13 to reduce the diameter of the fibre lumen 8 adjacent its opening 14 from the pot 6.



FIG. 3G shows the insertion of hollow annulus 15, for example, a hollow pin, into the end of the fibre lumen 8 in the region of the pot 6 to reduce the cross-sectional area of the lumen 8 in the region of the pot 6.



FIG. 3H shows the use of a porous layer of material 10 across the lumen opening 14 as also shown in the embodiment of FIG. 2.



FIG. 3I shows an embodiment where a porous material is forced into the lumen opening 14 to form a plug 16. This can be achieved by smearing a porous grout across and into the fibre lumen opening 14. Again this serves to reduce the flow resistance of the fibre lumen in the region of the pot 6.



FIG. 3J illustrates an embodiment of the invention where the fibre lumen 8 is narrowed within the region of the pot 6 by causing the potting material to swell or constricting the end of the fibre.



FIG. 3K shows an embodiment where the fibre lumen end is narrowed prior to potting.



FIG. 4 shows the results of a test performed on two modules to illustrate the operation of the invention. Two modules A and B were used in the test. For each module one hollow fibre membrane was potted. The end of the fibre which was not in the pot, was sealed. A stainless steel mesh was glued on the top of one of the pots in a way that prevented sideways flow of feed bypass during filtration in a similar manner to the embodiments shown in FIGS. 2 and 3H. The mesh had openings of 51 microns and was 56 microns thick. The characteristics of both of the modules are shown in Table 1.









TABLE 1







Characteristics of the modules











Length of the pot Lp
Length of the



Name
(mm)
fibre Lf (mm)
Other characteristics





Module A
56
202
none


Module B
53
205
Mesh glued on the pot









Firstly, feed water was filtered through module A for 35 minutes. During this filtration, the transmembrane pressure (TMP) was measured. Then the fibre of module A was cut as close to the pot as possible and module A filtered the same feed water for a further 35 minutes. During this filtration, the transmembrane pressure (TMP) was measured. The same test was repeated with the module B using the same feed water.


The graph shown in FIG. 4 compares the TMP of the modules A and B during the two filtrations before and after the fibre was cut. The first part of the graph shows that the two curves are very similar. In particular, it shows that TMP of both modules increased at the same rate. Fibres of the modules were fouled at a similar rate. The small difference in TMP between the two modules is due to the mesh on module B which adds a small extra resistance to flow. The second part of the graph after the fibre of modules was cut shows that TMP of module A and B developed in a highly different way. The TMP of module A remained low and level whereas the TMP of module B increased sharply showing that the mesh was blocked by the feed contaminants.


This test clearly shows the efficiency of a mesh as far as reduction of integrity loss is concerned. Due to the addition of the mesh to the module, the cut fibre quickly sealed itself, preventing the feed from contaminating the filtrate.


It will be apparent to those skilled in the art that a wide variety and number of techniques can be used to reduce the flow within the fibre lumen in the region of the pot and that such techniques fall within the scope of the invention described. It will also be appreciated that further embodiments and exemplifications of the invention are possible without departing from the spirit or scope of the invention described.

Claims
  • 1. A method of reducing an effect of integrity loss in a hollow fiber membrane module upon breakage of at least one membrane during filtration, the method comprising: supporting at least one end of a plurality of hollow fiber membranes, each comprising a lumen, in a membrane pot to form the hollow fiber membrane module; andinserting a hollow pin into the lumen of each hollow fiber membrane at a potted segment of each membrane lumen to provide an inner cross-sectional area of the potted segment of each membrane lumen that is smaller than an inner cross-sectional area of a remaining segment of each membrane lumen.
  • 2. A hollow fiber membrane module, comprising: a plurality of hollow fiber membranes each comprising a lumen and each having at least one end supported in a pot; anda hollow pin inserted into the lumen of each one of the plurality of hollow fiber membranes in a region of the pot.
  • 3. A filtration system, comprising: a hollow fiber membrane module, comprising: a plurality of hollow fiber membranes, each hollow fiber membrane comprising a lumen, wherein at least one end of each of the hollow fiber membranes is supported in a pot; anda hollow pin inserted into the lumen of each one of the plurality of hollow fiber membranes in a region of the pot to increase a flow resistance through the lumen of each of the hollow fiber membranes in the region of the pot; anda source of feed water fluidly connected to an inlet of the hollow fiber membrane module.
  • 4. The system of claim 1, further comprising a sensor configured to monitor a transmembrane pressure level in the filtration system during filtration of the feed water.
Priority Claims (1)
Number Date Country Kind
PS3006 Jun 2002 AU national
RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No. 11/496,378, filed on Jul. 31, 2006, entitled METHODS OF MINIMISING THE EFFECT OF INTEGRITY LOSS IN HOLLOW FIBRE MEMBRANE MODULES, now U.S. Pat. No. 7,344,645, which is a continuation of U.S. patent application Ser. No. 11/015,655, filed Dec. 16, 2004, entitled METHODS OF MINIMISING THE EFFECT OF INTEGRITY LOSS IN HOLLOW FIBRE MEMBRANE MODULES, which is now U.S. Pat. No. 7,160,463, which is a continuation of International Patent Application No. PCT/AU03/00755, filed on Jun. 17, 2003, under the Patent Cooperation Treaty (PCT), which was published by the International Bureau in English on Dec. 24, 2003, which designates the United States and which claims the benefit of Australian Provisional Patent Application No. PS 3006, filed Jun. 18, 2002.

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Related Publications (1)
Number Date Country
20080179249 A1 Jul 2008 US
Continuations (3)
Number Date Country
Parent 11496378 Jul 2006 US
Child 12022940 US
Parent 11015655 Dec 2004 US
Child 11496378 US
Parent PCT/AU03/00755 Jun 2003 US
Child 11015655 US