JP5811738B2 - Method for repairing hollow fiber membrane module and hollow fiber membrane module - Google Patents

Description

  The present invention relates to a method for repairing a hollow fiber membrane module and a hollow fiber membrane module.

  Hollow fiber membrane modules are widely used as filtration means in sewage treatment, water purification, reclaimed water purification, and the like. Particularly in applications that require an increase in the size of membrane filtration equipment, both ends of the hollow fiber membrane, called a submerged hollow fiber membrane module, are bonded and fixed to a water collection tube with a potting material, and the portions other than the adhesive fixed portion of the hollow fiber membrane A module of a type that is immersed in the water to be treated in a state where is exposed.

In such a hollow fiber membrane module, the surface of the hollow fiber membrane is damaged by foreign matters contained in the water to be treated during filtration, and a leak portion (a portion in which the water to be treated leaks into the filtered water side) .) May occur. For example, the following methods (i) and (ii) are known as methods for repairing such leaked portions of the hollow fiber membrane.
(I) A method of filling the opening end of the hollow fiber membrane where the leaked portion is filled with an ultraviolet curable resin and curing it, thereby closing the opening end of the hollow fiber membrane (Patent Document 1).
(Ii) A method of filling the open end of the hollow fiber membrane in which a leak portion has occurred with hot melt resin and curing it, thereby closing the open end of the hollow fiber membrane (Patent Document 2).
That is, both the methods (i) and (ii) are repair methods in which the open end of the hollow fiber membrane in which the leak portion is generated is blocked and the hollow fiber membrane is not used for filtration.

Further, during filtration, a large breaking stress may be applied to the hollow fiber membrane in the vicinity of the end surface on the treated water side of the portion to be bonded and fixed by the potting material, and a leak portion may occur in the hollow fiber membrane at that portion. As a method for repairing such a leak portion, the following method (iii) is known.
(Iii) A method in which a liquid aqueous fluororubber is supplied and solidified on the outer peripheral portion of the hollow fiber membrane on the treated water side of the bonded fixing portion by the potting material so as to cover the leak portion (Patent Document 3).

JP 7-136253 A JP-A-5-168875 JP 2003-93850 A

  However, in the methods (i) to (iii), the filtration area of the hollow fiber membrane in the module is greatly reduced after the repair, so that there is a problem that the processing efficiency is lowered.

  The present invention provides a method for repairing a hollow fiber membrane module capable of stably repairing a leak portion generated in the hollow fiber membrane and suppressing a reduction in processing efficiency after the repair, and a hollow fiber membrane module repaired by the repair method. For the purpose of provision.

The repair method of the hollow fiber membrane module of the present invention is a method of repairing a leak portion generated in the hollow fiber membrane of the hollow fiber membrane module,
It is a method including a repairing step in which a curable repair agent is filled from the outside of the leak portion of the hollow fiber membrane into the membrane, and the repair agent is cured in a state where the leak portion is closed.
The hollow fiber membrane module is a submerged module in which a plurality of hollow fiber membranes are converged and one or both ends thereof are open, and both ends are bonded and fixed to a water collecting pipe with a potting material. preferable.
The repair agent is preferably filled by injecting into the membrane from the outside of the leak portion of the hollow fiber membrane using an injection needle.
In addition, after the repair agent is filled in the membrane of the leak portion of the hollow fiber membrane, a gas is injected into the hollow fiber membrane at a pressure below the bubble point, and the repair agent is aggregated in the leak portion and cured. It is preferable to make it.
The outer diameter of the injection needle is preferably 1 mm or less.
The repair agent is preferably an epoxy resin.
The viscosity of the repair agent before curing is preferably 500 to 20000 mPa · s.
The hollow fiber membrane module of the present invention is a hollow fiber membrane module repaired by the repair method of the present invention.

According to the method for repairing a hollow fiber membrane module of the present invention, it is possible to stably repair a leak portion generated in the hollow fiber membrane and to suppress a reduction in processing efficiency after the repair.
In the hollow fiber membrane module of the present invention, the leaked portion generated in the hollow fiber membrane by the repair method of the present invention is stably repaired, and the reduction in the processing efficiency after repair is also suppressed.

It is the front view which showed an example of the hollow fiber membrane module of this invention. It is the perspective view which showed typically the leak part of the hollow fiber membrane. It is sectional drawing when the hollow fiber membrane of FIG. 2 is cut | disconnected along the length direction of a membrane. It is sectional drawing which showed a mode that the repair agent was filled in the film | membrane of the leak part of a hollow fiber membrane. It is the perspective view which showed a mode that a repair agent was inject | poured in the film | membrane of the leak part of a hollow fiber membrane.

(Hollow fiber membrane module)
FIG. 1 is a front view showing an example of a hollow fiber membrane module repaired by the repair method of the present invention.
The hollow fiber membrane module 10 includes a plurality of hollow fiber membranes 11 arranged in a sheet shape, and two water collection pipes 20a and 20b provided at both ends in the length direction of the hollow fiber membrane 11. And has a flat rectangular shape as a whole. Both ends of each hollow fiber membrane 11 are opened and fixed in a non-removable manner in the water collecting pipes 20a and 20b with a potting material, and the hollow part of the hollow fiber membrane 11 and the flow paths in the water collecting pipes 20a and 20b are connected. Communicate.
In addition, as for the edge part of the hollow fiber membrane 11, although it is preferable that both ends are open ends, only one side may be an open end and the other edge part may be sealed.

  The hollow fiber membrane module 10 shown in FIG. 1 is referred to as a submerged membrane module, which is immersed in water to be treated and filtered by suction, thereby allowing water to permeate from the outside of the membrane to the inside of the water collecting pipe 20a, The filtered water is obtained from a water intake (not shown) formed in at least one of the end faces of 20b.

  The fraction level of the hollow fiber membrane 11 may be any level of a microfiltration membrane (MF), an ultrafiltration membrane (UF), a nanofiltration membrane (NF), etc. The pore diameter, porosity, film thickness, outer diameter, etc. are appropriately determined. For example, in the case of a hollow fiber membrane for the purpose of removing organic substances and viruses, it is preferable to use an ultrafiltration membrane, particularly a hollow fiber membrane having a membrane molecular weight cut off from tens of thousands to hundreds of thousands. Moreover, as an outer diameter of the hollow fiber membrane 11, it is 0.1-10 mm, for example, Preferably it is 0.5-5 mm.

  The material of the hollow fiber membrane 11 is not limited as long as it is a material that can be molded into a hollow fiber membrane, and examples thereof include cellulose-based, polyolefin-based, polyvinyl alcohol-based, polysulfone-based, polyacrylonitrile-based, and fluorine-based resins. Can be mentioned. Specific examples include polyethylene, polypropylene, polyvinylidene fluoride, polytetrafluoroethylene, and polysulfone.

  Among these, it is preferable to select a resin excellent in chemical resistance, and a fluorine resin is particularly preferable. Among the fluorine-based resins, polyvinylidene fluoride (PVDF) is more preferable from the viewpoint of formability and chemical resistance when forming a hollow fiber membrane. Examples of the polyvinylidene fluoride include a homopolymer of vinylidene fluoride and a copolymer obtained by copolymerizing a monomer copolymerizable with vinylidene fluoride with vinylidene fluoride. Examples of the monomer copolymerizable with vinylidene fluoride include vinyl fluoride, tetrafluoroethylene, ethylene trifluoride, hexafluoropropylene, and the like, and one or more kinds can be used.

  The hollow fiber membrane 11 may be provided with a hollow support in the inside thereof in order to prevent membrane breakage during long-term use. Examples of the support include hollow monofilament yarn, knitted string, braided string, and the like.

  As a potting material for fixing the hollow fiber membrane 11 in the water collection tubes 20a and 20b, a thermosetting resin such as polyurethane resin or epoxy resin is preferably used. The potting material isolates the inside and the outside of the hollow fiber membrane 11 in the water collection pipes 20a and 20b.

  The material of the water collecting pipes 20a and 20b may be any material having mechanical strength and durability, such as polycarbonate, polysulfone, polypropylene, acrylic resin, ABS resin, modified PPE resin, PPS resin, and corrosion-resistant metal. It is preferable to select one having good adhesion to the potting material.

As an example of the immersion type hollow fiber membrane module having a flat rectangular shape as a whole as shown in FIG. 1, for example, Zeweed 500d of Zenon Environment Co., Ltd., SADF 2580 of Mitsubishi Rayon Co., Ltd. and the like can be mentioned. Since such a hollow fiber membrane module 10 has a flat rectangular shape, it has excellent integration and cleanability when immersed in the water to be treated.
Moreover, since the water collection part 20a, 20b is the form fixed to the both ends of the hollow fiber membrane 11 so that attachment or detachment is impossible, the pressure collection property is excellent, the structure is simple, and the degree of integration is high. preferable.

  The configuration and shape of the hollow fiber membrane module are not limited to those shown in the drawings, and are appropriately selected in view of the size of the water tank to be treated, the properties of the treatment components contained in the water to be treated, the washability, and the like. The For example, the water collecting pipe is not limited to a pipe having a rectangular cross section perpendicular to the axial direction, and includes a pipe having a circular (annular) cross section. In FIG. 1, a so-called immersion type membrane module is shown as an example.

  In such a hollow fiber membrane module 10, during use, the surface of the hollow fiber membrane 11 is damaged by foreign matters contained in the water to be treated, thereby causing pinholes and tears, and the portions are shown in FIG. A leak portion 30 as shown in FIG. The leak portion refers to a portion in which the separation between the inner side and the outer side of the hollow fiber membrane is imperfect and the water to be treated leaks into the filtered water side.

(Repair method)
Hereinafter, as an example of a method for repairing the hollow fiber membrane module of the present invention, a method for repairing the leak portion 30 generated in the hollow fiber membrane 11 of the hollow fiber membrane module 10 will be described. Examples of the repair method of the hollow fiber membrane module 10 include a method having the following leak inspection process, repair process, and repair confirmation process.
Leak detection step: A leak inspection is performed to detect the leak portion 30 generated in the hollow fiber membrane 11.
Repair process: As shown in FIG. 4, a curable repair agent 40 (hereinafter, simply referred to as “repair agent 40”) is filled in the membrane of the leak portion 30 of the hollow fiber membrane 11 to block the leak portion 30. The repair agent 40 is cured in the state.
Repair confirmation process: After the repair process, the leak inspection is performed again to confirm that the leak portion 30 is repaired.

Leak inspection process:
Examples of the leak inspection method for detecting the leak portion 30 include an inspection method using fine particles, a so-called suction method, and the like. Among these, in a state where the hollow fiber membrane module 10 is immersed in water or an aqueous solution, a gas is pressed into the hollow fiber membrane module 10 in the direction opposite to the filtration direction of the hollow fiber membrane module 10 to thereby reduce the amount of bubbles. A method of identifying the position of the leak portion 30 from the occurrence location is preferable. Specifically, the hollow fiber membrane module 10 is immersed in an organic solvent aqueous solution such as an ethanol aqueous solution, and a gas is pressed in that state, or the hollow fiber membrane module 10 is immersed in an ethanol aqueous solution to hydrophilize the membrane surface, There is a method in which the hollow fiber membrane module 10 that has been made hydrophilic is once taken out, re-immersed in a water tank containing water, and gas is injected in that state (see, for example, Japanese Patent Application Laid-Open No. 2001-205056). Further, a surfactant aqueous solution may be used in place of the organic solvent aqueous solution.
Such a leak inspection method using a pressurized gas has high detection sensitivity and is widely adopted.

  In the illustrated hollow fiber membrane module 10, the water collecting pipes 20 a and 20 b are fixed to both ends of the hollow fiber membrane 11 so as not to be detachable, and the end face of the hollow fiber membrane 11 cannot be exposed. When a leak test is performed on the hollow fiber membrane module 10 of this form using a pressurized gas, gas is press-fitted into the hollow fiber membrane 11 from the water collecting pipes 20a and 20b side, and bubbles from the hollow fiber membrane 11 are removed. A method of specifying the generation point, that is, a method of press-fitting gas in the direction opposite to the filtration direction is preferably employed.

Repair process:
The water in the hollow fiber membrane 11 of the hollow fiber membrane module 10 is discharged, and as shown in FIG. 5, the syringe 51 having the syringe 51 and the injection needle 52 attached to the tip of the syringe 51 is used, and the injection needle 52 is hollowed out. As shown in FIG. 4, the repair agent 40 inserted into the leak portion 30 of the thread membrane 11 and injected into the membrane of the leak portion 30 of the hollow fiber membrane 11 is injected from the injection needle 52 into the membrane of the hollow fiber membrane 11. In addition, the repair agent 40 is cured in a state where the leak portion 30 is blocked.
In the repairing method of the present invention, the repairing agent 40 is filled in the membrane of the leaking portion 30 of the hollow fiber membrane 11 and the leaking portion 30 is closed by the repairing agent 40 in this way. Therefore, it is possible to prevent the liquid to be treated from leaking into the filtrate from the leak portion 30 without blocking the open end of the hollow fiber membrane 11 in which the leak portion 30 is generated. The membrane parts on both sides can be used for filtration even after repair. Therefore, a reduction in processing efficiency after repair is suppressed.
In addition, it is conceivable to repair the leaked portion 30 by applying the repair agent 40 to the leaked portion 30 and curing the leaked portion 30, but when this method was tried, the durability of the repaired portion could not be sufficiently obtained. . In contrast, the repair method of the present invention fills the repair agent 40 in the film of the leak portion 30 and cures the leak portion 30 so that the cured product of the repair agent 40 is not easily detached from the leak portion 30. Even if the repaired hollow fiber membrane 11 is used for filtration after repair, the durability of the repaired portion can be sufficiently obtained.

The outer diameter of the injection needle 52 is preferably 1 mm (19 G) or less because it is easy to prevent the hollow fiber membrane 11 from tearing and the leak portion 30 from becoming larger when the injection needle 52 is inserted into the leak portion 30. . The outer diameter of the injection needle 52 is preferably 0.5 mm (25 G) or more because the inner diameter of the injection needle 52 is sufficiently secured and the injection of the repairing agent 40 becomes easy.
In the parentheses, the outer diameter is shown using a unit called G (gauge) representing the thickness of the injection needle. The larger the number, the thinner the outer diameter.

  The repairing agent 40 may be a curable repairing agent capable of repairing the leaked portion of the hollow fiber membrane, such as a thermosetting adhesive (for example, an acrylic adhesive, an epoxy adhesive, an oxetane adhesive, etc. ), Moisture curable adhesives (eg, urethane adhesives, silicone adhesives, modified silicone adhesives, cyanoacrylate instantaneous adhesives, etc.), UV curable adhesives (eg, acrylic, cyanoacrylate, etc.) System, etc.), hot melt resins, epoxy resins and the like.

When an ultraviolet curable resin or a hot melt resin that is cured only by ultraviolet rays is used as the repairing agent 40, these repairing agents do not adhere well to the leaking part 30 unless the leaking part 30 is dry. As a pretreatment, drying of the leak portion 30 is indispensable. Therefore, a thermosetting adhesive, a moisture curable adhesive, and an epoxy resin are preferable because they do not need to be dried before repair.
If drying before repair is unnecessary, not only the time required for drying can be reduced, but also the occurrence of fluctuations in the effective membrane area due to wet-heat shrinkage of the hollow fiber membrane due to drying can be avoided. In addition, once the hollow fiber membrane is dried, a repair confirmation process for confirming whether or not the leak portion is reliably blocked after repair of the leak portion, and when returning the hollow fiber membrane module to the water to be treated, Need to be hydrophilized again, which takes time and labor. On the other hand, when it is not dried before repairing, the work of making it hydrophilic again becomes unnecessary, and both time and labor can be reduced. Moreover, the shape change by the wet heat shrinkage | contraction of the hollow fiber membrane by repeating drying and hydrophilization can also be avoided. Furthermore, if drying is not required before repair, it is not necessary to move the hollow fiber membrane module 10 to a facility with a drying facility, and it is possible to quickly repair at the site of use thereof, that is, a water purification plant or a sewage treatment plant. it can. As a result, the time and labor required for the work associated with the repair of the leak portion 30 can be greatly reduced, and the work efficiency on site can be greatly improved.
As the repairing agent 40, a repairing agent of the same type as the potting material is more preferable. Moreover, since it is excellent in water resistance, an epoxy resin is especially preferable.

  Since the fluidity inside the hollow fiber membrane 11 does not become too high and it becomes easy to close the leak portion 30 with the repair agent 40, the viscosity of the repair agent 40 before curing is preferably 500 mPa · s or more, 1000 mPa · s or more is more preferable. Moreover, since the injection | pouring into the film | membrane of the leak part 30 of the hollow fiber membrane 11 becomes easy, 20000 mPa * s or less is preferable and the viscosity before hardening of the repair agent 40 is more preferable.

After filling the repair agent 40 into the membrane of the leak portion 30 of the hollow fiber membrane 11, gas was injected into the hollow fiber membrane 11 at a pressure equal to or lower than the bubble point to aggregate the repair agent 40 into the leak portion 30. It is preferable to cure in the state. Thereby, since it can suppress that the repair agent 40 inject | poured in the film | membrane of the leak part 30 flows into the opening end side of the hollow fiber membrane 11, the reduction of the filtration area after repair becomes smaller, and the processing efficiency after repair Can be further suppressed. Further, since the repair agent 40 aggregates in the film of the leak portion 30, the leak portion 30 is more stably blocked, so that the leak portion 30 can be repaired more reliably.
The direction in which the gas is injected is the direction from the open end side of the hollow fiber membrane 11 toward the center of the length direction of the membrane, that is, the water to be treated is pressurized to allow water to permeate from the outside to the inside of the hollow fiber membrane 11. The direction opposite to the filtration direction when obtaining filtered water is preferred. When both ends of the hollow fiber membrane 11 are open ends, gas is injected from both open end sides of the hollow fiber membrane 11.
The bubble point is the lowest pressure at which bubbles are generated from the leak portion 30 when a gas is pressed into the hollow fiber membrane 11 from the opening end side.

  The pressure when the gas is pressed into the hollow fiber membrane 11 is preferably 10 to 100 kPa. If the pressure is equal to or higher than the lower limit value, the repair agent 40 tends to aggregate in the film of the leak portion 30. Moreover, if the said pressure is below an upper limit, it will be easy to suppress that the repair agent 40 inject | poured in the film | membrane of the leak part 30 is discharge | released from the leak part 30. FIG.

  The curing of the repair agent 40 may be appropriately performed according to the type of the repair agent 40. For example, if the repair agent 40 is a moisture curable adhesive, the curing reaction proceeds due to moisture in the hollow fiber membrane 11 when filled in the leaked portion 30 of the hollow fiber membrane 11. If the repair agent 40 is a thermosetting adhesive, the curing reaction proceeds by heating at a temperature corresponding to the type of the thermosetting adhesive after filling the film of the leak portion 30.

Repair confirmation process:
A leak inspection is performed on the hollow fiber membrane module 10 repaired in the repair process, and it is confirmed whether or not the leak portion 30 has been repaired.
The leak inspection in the repair confirmation process can be performed in the same manner as the leak inspection process.

According to the repair method of the present invention described above, the leak part can be repaired by filling the film of the leak part generated in the hollow fiber membrane with a repair agent and curing, and the processing efficiency after repair is improved. The decrease can also be suppressed. Further, sufficient durability of the repaired portion can be obtained.
The repair method of the present invention is not limited to the above-described method. For example, in the repair method, the injection needle may not be used when the repair agent is injected. Even when an injection needle is used, for example, when the repair agent is a cartridge type, the injection of the repair agent may be performed by attaching the injection needle to the cartridge.
Moreover, the method which does not perform one or both of a leak inspection process and a repair confirmation process may be sufficient.

  The hollow fiber membrane module of the present invention is a hollow fiber membrane module in which a leak portion is repaired by the above-described repair method of the present invention, and a reduction in processing efficiency is suppressed compared to before repair, and the durability of the repaired portion is improved. Is also excellent.

EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by the following description.
[Example 1]
Porous hollow fiber membrane (Mitsubishi Rayon Co., Ltd., inner diameter 1000 μm, outer diameter 2800 μm) processed into a hollow shape by knitting PET (polyethylene terephthalate) fiber and having a PVDF (polyvinylidene fluoride) porous portion formed on the surface thereof The immersion type hollow fiber membrane module in which these hollow fiber membranes are exposed were subjected to a leak inspection process, a repair process, and a repair confirmation process as follows.

Leak inspection process:
The hollow fiber membrane module described above was immersed in a hydrophilization solution (manufactured by Nissin Chemical Industry Co., Ltd., Olfin EXP4036, 0.3 wt% aqueous solution: surface tension 25.8 mN / m) for 10 minutes, and then taken out and filled with water. It was immersed again in the water tank, and in that state, pressurized air was injected at 100 kPa from the inside into the hollow fiber membrane of the hollow fiber membrane module, and a leak test was performed.
After marking a portion where bubbles were generated from the hollow fiber membrane as a leak portion, water inside the hollow fiber membrane module was discharged, and the leak portion and surrounding droplets were wiped with waste paper to such an extent that water did not drop.
Repair process:
As a repairing agent, a cartridge-type two-component curing epoxy adhesive (E-30CL manufactured by Henkel) was used, and an injection needle (made by Terumo) having an outer diameter of 0.8 mm (21 G) was attached to the tip of the cartridge. Was inserted into the leak portion, and 3 mL of a repair agent was injected into the membrane of the leak portion of the hollow fiber membrane to be cured.
Repair confirmation process:
After curing, a leak inspection was performed in the same manner as in the leak inspection step, and it was confirmed that the leak portion was repaired. As a result, there was no generation of bubbles and it was confirmed that the leak portion was repaired.

  Using the hollow fiber membrane module after repair by the repair method, filtration operation was performed in water for 1000 hours, and then a leak inspection was performed again. However, there was no generation of bubbles from the repaired leak portion, and the repair location Had excellent durability.

[Example 2]
A leak test was performed in the same manner as in Example 1. After marking the leaked part detected as bubbles and discharging the water inside the module, dry air was injected under 20 kPa below the bubble point in the direction opposite to the filtration direction. Then, the hollow fiber membrane was dried.
Next, in the same manner as in Example 1, the repair agent was injected and filled into the membrane of the leak portion of the hollow fiber membrane, and the repair agent was injected while pressing dry air at 20 kPa below the bubble point in the direction opposite to the filtration direction for 5 minutes. Was cured.
Next, a leak inspection was performed in the same manner as in Example 1, and it was confirmed that the leak portion was repaired. As a result, no bubbles were generated, and it was confirmed that the leak portion was repaired.

  Using the hollow fiber membrane module after repair by the repair method, filtration operation was performed in water for 1000 hours, and then a leak inspection was performed again. However, there was no generation of bubbles from the repaired leak portion, and the repair location Had excellent durability.

[Comparative Example 1]
After performing the leak inspection process in the same manner as in Example 1, in the repair process, a two-part curing epoxy adhesive (E-30CL manufactured by Henkel), which is a repair agent, is applied to the surface around the leak portion and cured. The leak was closed and repaired. Subsequently, when the repair confirmation process was implemented similarly to Example 1, it was confirmed that there was no bubble generation and the leak part was repaired.
Using the hollow fiber membrane module after being repaired by the repair method, a filtration operation was performed in water for 1000 hours, and then a leak inspection was performed again. As a result, bubbles were generated and a part of the repaired part was found during the filtration operation. It was confirmed that was peeled off.

DESCRIPTION OF SYMBOLS 10 Hollow fiber membrane module 11 Hollow fiber membrane 20a, 20b Water collecting pipe 30 Leak part 40 Repair agent 50 Syringe 51 Syringe 52 Injection needle

Claims (8)

A method of repairing a leak portion generated in a hollow fiber membrane of a hollow fiber membrane module,
A repair method for a hollow fiber membrane module, comprising a repairing step of filling a curable repair agent into the membrane from outside the leak portion of the hollow fiber membrane and curing the repair agent in a state where the leak portion is closed.   The hollow fiber membrane module is a submerged module in which a plurality of hollow fiber membranes are converged and one or both ends thereof are open, and both ends are bonded and fixed to a water collecting pipe with a potting material. Item 2. A method for repairing a hollow fiber membrane module according to Item 1. The method for repairing a hollow fiber membrane module according to claim 1 or 2, wherein the repair agent is injected and filled into the membrane from outside the leak portion of the hollow fiber membrane using an injection needle.   After filling the repair agent into the membrane of the leak portion of the hollow fiber membrane, a gas is injected into the hollow fiber membrane at a pressure equal to or lower than the bubble point, and the repair agent is hardened in a state of being aggregated in the leak portion. The repair method of the hollow fiber membrane module as described in any one of Claims 1-3.   The repair method of the hollow fiber membrane module of Claim 3 whose outer diameter of the said injection needle is 1 mm or less.   The repair method of the hollow fiber membrane module as described in any one of Claims 1-5 whose said repair agent is an epoxy resin.   The repair method of the hollow fiber membrane module as described in any one of Claims 1-6 whose viscosity before hardening of the said repair agent is 500-20000 mPa * s.   The hollow fiber membrane module repaired by the method as described in any one of Claims 1-7.

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