WO2012133068A1 - Module à membranes à fibres creuses - Google Patents

Module à membranes à fibres creuses Download PDF

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Publication number
WO2012133068A1
WO2012133068A1 PCT/JP2012/057240 JP2012057240W WO2012133068A1 WO 2012133068 A1 WO2012133068 A1 WO 2012133068A1 JP 2012057240 W JP2012057240 W JP 2012057240W WO 2012133068 A1 WO2012133068 A1 WO 2012133068A1
Authority
WO
WIPO (PCT)
Prior art keywords
hollow fiber
fiber membrane
membrane module
small bundle
cylindrical container
Prior art date
Application number
PCT/JP2012/057240
Other languages
English (en)
Japanese (ja)
Inventor
道隆 ▲樋▼垣
大昌 金井
Original Assignee
東レ株式会社
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 東レ株式会社 filed Critical 東レ株式会社
Priority to JP2012543385A priority Critical patent/JPWO2012133068A1/ja
Publication of WO2012133068A1 publication Critical patent/WO2012133068A1/fr

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    • 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
    • B01D63/04—Hollow fibre modules comprising multiple hollow fibre assemblies
    • B01D63/043—Hollow fibre modules comprising multiple hollow fibre assemblies with separate tube sheets
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/20—Specific housing
    • B01D2313/201—Closed housing, vessels or containers
    • 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

Definitions

  • the present invention relates to a hollow fiber membrane module used for membrane separation. More specifically, for example, the present invention relates to a hollow fiber membrane module used for water purification treatment such as river water, lake water, ground water, seawater, etc., or membrane separation treatment such as sewage and industrial wastewater.
  • water purification treatment such as river water, lake water, ground water, seawater, etc.
  • membrane separation treatment such as sewage and industrial wastewater.
  • Membrane separation technology using hollow fiber membranes includes drinking water production in waterworks, industrial water, industrial ultrapure water, industrial water production such as food and medicine, sewage treatment such as municipal sewage purification and industrial wastewater treatment, etc. It is used in a wide range of fields.
  • This hollow fiber membrane module is classified into a pressure type and an immersion type, and the pressure type hollow fiber membrane module is roughly classified into an internal pressure type and an external pressure type.
  • the external pressure hollow fiber membrane module and the submerged hollow fiber membrane module arrange raw water, which is the water to be treated, on the outside of the membrane, and obtain filtered water from the raw water by pressurization, suction pressure, or water head pressure .
  • the external pressure type hollow fiber membrane module stores a hollow fiber membrane bundle in which hundreds to tens of thousands of hollow fiber membranes are bundled in a cylindrical container, and both ends of the hollow fiber membrane bundle are made of resin. It is bonded to the inner wall of the cylindrical container by potting.
  • one potting end opens the hollow fiber membrane end, and the other potting end seals the hollow fiber membrane end.
  • a plurality of hollow fiber membranes are permeated by pressurizing and supplying raw water to a region sandwiched between the end portions, and the filtered water is taken out of the potting end portion where the hollow fiber membrane ends are opened.
  • the resin part on the side where the hollow fiber membrane end is sealed is provided with a plurality of aeration holes for introducing a compressible gas.
  • the immersion type hollow fiber membrane module is often not covered with the above-described cylindrical container, and is covered with a cylindrical container provided with a plurality of holes through which raw water can flow even when covered with the container.
  • Patent Document 1 When the hollow fiber membrane module having the structure shown in Patent Document 1, Patent Document 2, or Non-Patent Document 1 is used, suspended substances in the vicinity of the potting resin on the sealing side can be efficiently dropped during physical cleaning. Since the sealing portion for each small bundle disposed on the lower side during use is not fixed to the cylindrical container, suspended substances remaining on the potting resin are also reduced.
  • the hollow fiber membrane near the potting resin sealed for each small bundle may not be sufficiently washed and suspended material may accumulate on each small bundle of potting resin. Since the accumulated suspended solids cannot be removed even by physical washing, not only the effective area of the membrane required for filtration is reduced, but also some suspended solids are pushed back into the filtration zone, resulting in hollow fiber membranes. There is a possibility of reducing the filtration performance by adhering to the surface of the bundle. Such inconvenience is a concern especially when the raw water has high turbidity or when the small bundle cross-sectional area is increased in order to increase the area of the hollow fiber filled membrane.
  • the present invention aims to solve such problems.
  • the present invention is characterized by the following (1) to (3).
  • a hollow fiber membrane module in which a plurality of hollow fiber membranes are housed in a cylindrical container, One end of each of the plurality of hollow fiber membranes is bonded and fixed to the cylindrical container together with an end face opened, and the other end of each of the plurality of hollow fiber membranes is It is divided into a plurality of small bundles, and is a small bundle fixing portion bonded to each small bundle in a state where the end face is sealed,
  • the hollow fiber membrane module in which the small bundle fixing part has at least one air diffusion hole penetrating in the longitudinal direction of the hollow fiber membrane.
  • a hollow fiber membrane module comprising a gas reservoir part communicating with the air diffuser at a lower part of the small bundle fixing part.
  • the air diffused gas passes through the air diffuser holes during the physical cleaning of the hollow fiber membrane module.
  • the accumulation of suspended substances on the small bundle fixing part is greatly increased. Can be reduced. For this reason, it is possible to suppress a decrease in the effective area of the membrane over time, and to drastically reduce the amount of the suspended suspended matter that reattaches to the surface of the hollow fiber membrane bundle. Therefore, it is possible to provide a hollow fiber membrane module having excellent filtration performance and excellent durability.
  • the total amount of gas per unit time introduced into the small bundle at the time of physical cleaning is provided by providing the gas reservoir portion communicating with the air diffuser at the lower portion of the small bundle fixing portion. Therefore, a more excellent effect can be obtained at the time of physical cleaning of the hollow fiber membrane module. Therefore, it is possible to provide a hollow fiber membrane module having excellent filtration performance and excellent durability.
  • the hollow fiber membrane module of the present invention it is possible to improve the turbidity elimination by physical cleaning such as air scrubbing, back pressure cleaning, and flushing, and it is possible to reduce physical cleaning frequency or physical cleaning time. And a membrane filtration method that can contribute to energy saving can be provided.
  • FIG. 1 is a schematic cross-sectional view showing a configuration of a hollow fiber membrane module according to an embodiment of the present invention.
  • FIG. 2 is an enlarged cross-sectional view of the small bundle fixing portion in FIG.
  • FIG. 3 is a schematic cross-sectional view showing a configuration of a hollow fiber membrane module according to another embodiment of the present invention.
  • FIG. 4 is a cross-sectional view showing an example of a gas reservoir according to still another embodiment of the present invention.
  • FIG. 5 is a cross-sectional view showing another example of the gas reservoir in FIG.
  • FIG. 1 is a schematic sectional view showing an example of an external pressure type hollow fiber membrane module according to the present invention.
  • FIG. 2 is an enlarged cross-sectional view of the small bundle fixing portion 10 in FIG.
  • This hollow fiber membrane module 1 is configured by storing hundreds to tens of thousands of hollow fiber membranes 2 in a cylindrical container 3.
  • One end portions (upper end portions) of the hollow fiber membranes 2 are collectively fixed in a liquid-tight manner in the cylindrical container 3 with the end surfaces of the hollow fiber membranes open at the bonding portions 4.
  • the other end portion (lower end portion) of the hollow fiber membrane 2 is divided into small bundles 9 of several tens to several thousands in the small bundle fixing section 10. The end surfaces of the hollow fiber membranes are bonded in a sealed state.
  • the small bundle fixing portion 10 includes at least one air diffusion hole 11 penetrating in the longitudinal direction of the hollow fiber membrane 2. Further, the small bundle fixing portion 10 is not fixed to the cylindrical container 3, and can move freely for each small bundle 9. In the hollow fiber membrane 2, a region other than the adhesive portion 4 and the small bundle fixing portion 10 is a filtration region.
  • fixed part 10 cylindrical, spherical shape, a cone shape, a pyramid shape, etc. are arbitrary.
  • the material of the hollow fiber membrane 2 is not particularly limited, and polysulfone, polyethersulfone, polyacrylonitrile, polyimide, polyetherimide, polyamide, polyetherketone, polyetheretherketone, polyethylene, polypropylene, ethylene-vinyl alcohol copolymer, Examples thereof include cellulose, cellulose acetate, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene, and composite materials thereof.
  • the hollow fiber membrane 2 preferably has an outer diameter in the range of 0.3 to 3 mm. This is because if the outer diameter of the hollow fiber membrane is too small, the hollow fiber membrane will break during handling of the hollow fiber membrane when manufacturing the hollow fiber membrane module, and during filtration and washing when using the hollow fiber membrane module. This is because, if the outer diameter is too large, the number of hollow fiber membranes that can be inserted into a cylindrical container of the same size decreases and the filtration area decreases.
  • the hollow fiber membrane preferably has a thickness in the range of 0.1 to 1 mm. This is because, if the film thickness is too small, there is a problem that the film is broken by pressure, and conversely, if the film thickness is too large, there is a problem that it leads to pressure loss and an increase in raw material cost.
  • polymeric materials such as an epoxy resin, a urethane resin, and an epoxy acrylate resin, which are general-purpose goods and are inexpensive and have little influence on water quality Is preferably used.
  • an upper cap 5a for collecting filtered water and a lower cap 5b for supplying raw water and aeration gas for cleaning are respectively attached to both ends of the cylindrical container 3, and a filtered water outlet 6 is attached to the upper cap 5a.
  • the lower cap 5b is provided with a supply port 8 respectively.
  • Examples of the material of the cylindrical container 3, the upper cap 5a, and the lower cap 5b include polyolefins such as polyethylene, polypropylene, and polybutene, polytetrafluoroethylene (PTFE), tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin, and the like.
  • polyolefins such as polyethylene, polypropylene, and polybutene
  • PTFE polytetrafluoroethylene
  • tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin and the like.
  • PFA tetrafluoroethylene / hexafluoropropylene copolymer resin
  • FEP ethylene / tetrafluoroethylene copolymer resin
  • EFE ethylene / tetrafluoroethylene copolymer resin
  • PCTFE poly (trifluoroethylene chloride)
  • ECTFE copolymer resins
  • PVDF polyvinylidene fluoride
  • chlorine resins such as polyvinyl chloride and polyvinylidene chloride
  • AS Acrylo A tolyl-butadiene-styrene copolymer resin
  • ABS Acrylo A tolyl-butadiene-styrene copolymer resin
  • ABS Acrylo A tolyl-butadiene-styrene copolymer resin
  • ABS Acrylo A tolyl-butadiene-styrene copolymer resin
  • ABS Acrylo A tolyl-butadiene-styren
  • the cylindrical container 3, the upper cap 5a, and the lower cap 5b may be made of the same material or different materials.
  • the cylindrical container 3 and the lower cap 5b may be omitted in the configuration described above.
  • the cylindrical container 3 it is preferable to provide the cylindrical container 3 in order to guide the diffused gas at the time of physical cleaning to the upper part of the hollow fiber membrane, and in that case, the cylindrical container 3 has a structure such as a mesh structure that allows water to pass therethrough.
  • a member may be used.
  • a skirt member 5c having a cylindrical shape or the like may be attached instead of the lower cap 5b.
  • the cylindrical hollow fiber membrane module has been described.
  • the hollow fiber membrane module of the present invention is not limited to this, and the cross section may be polygonal.
  • the shape of the air diffuser 11 provided in the small bundle fixing part 10 may be a through hole whose cross section is circular, elliptical, or polygonal. Further, the cross-sectional area does not need to be constant in the axial direction, but is preferably at least 20 mm 2 or more from the viewpoint of preventing pressure loss of the gas passing through the diffuser holes. Furthermore, it is more preferable that the small bundle fixing unit 10 has a structure in which a recess is provided on the gas introduction side of the air diffusion hole 11 to increase the gas introduction efficiency into the air diffusion hole 11, that is, a structure in which the gas reservoir 12 is provided. Thereby, since the total amount of the diffused gas introduced into the diffuser holes 11 is increased and the pressure loss of the gas when passing through the diffuser holes is reduced, the physical cleaning ability by the gas can be improved.
  • more diffused gas introduced into the small bundle fixing unit 10 such as a conical shape, a cylindrical shape, or a polygonal column shape as shown in FIGS. 4 and 5 is accumulated, and Any shape that can be introduced into the air diffuser 11 may be used. Note that even if the cross-sectional area on the gas outflow side of the air diffuser 11 is increased, the physical cleaning ability tends to be improved. However, since the filtration area is reduced due to a decrease in the number of small bundles, the type and turbidity of raw water, It is preferable to determine appropriately according to the operation flow.
  • the method for forming the air diffuser may be such that the small bundle insertion container provided with the air diffuser in advance is fixed to the small bundle, or may be formed using a nest when the small bundle is bonded and fixed. Further, a diffused hole-shaped member may be embedded in the small bundle fixing portion.
  • air or oxygen is generally used as the aeration gas, but nitrogen gas or reaction gas is used when the raw water is a fermentation broth.
  • raw water is supplied from the supply port 8 provided in the lower cap 5b into the hollow fiber membrane module 1 using a pressure pump or the like.
  • Part of the raw water that has reached the filtration region in the cylindrical container 3 passes through each hollow fiber membrane 2 and enters the hollow fiber membrane 2 before being discharged from the discharge port 7.
  • the filtered water that has entered the inside of the hollow fiber membrane 2 is collected in the upper cap 5 a from the opening surface at the end of the hollow fiber membrane 2 and taken out from the filtered water outlet 6.
  • the concentrated water that has not permeated through the hollow fiber membrane 2 is discharged from the discharge port 7.
  • the hollow fiber membrane 2 is swung also from the inside of the small bundles. Or it can be flushed. Therefore, the hollow fiber membrane in the vicinity of the small bundle fixing portion can be sufficiently washed, and the accumulation of suspended solids on the small bundle fixing portion can be greatly reduced, and the filtration performance is stably maintained. be able to.
  • the external pressure type hollow fiber membrane module that supplies raw water from the supply port 8 and performs pressure filtration has been described.
  • the hollow fiber membrane module 1 is immersed in a treated water tank containing raw water, and the filtered water outlet 6 is immersed.
  • An immersion type hollow fiber membrane module that performs suction filtration from the side may be used.
  • the hollow fiber membrane 2 used is a porous hollow fiber membrane made of polyvinylidene fluoride having an outer diameter of 1.5 mm, an inner diameter of 0.9 mm, and a length of about 1000 mm, and is bundled for about 3000 pieces to form a mesh structure with a pitch of 10 mm.
  • the cylindrical container 3 was made of polyethylene resin and had an inner diameter of about 140 mm and a length of about 1000 mm. Further, urethane resin was used for the bonding portion 4 and the small bundle fixing portion 10 respectively.
  • the small bundle fixing part 10 has a cylindrical shape with an outer diameter of 45 mm, a diffused hole 11 with an outer diameter of 8 mm is passed through the center, and 420 to 430 hollow fiber membranes are gathered around the periphery and the end face is sealed Fixed with.
  • the number of small bundles was 7 bundles so as to achieve the closest packing in the cylindrical container 3.
  • the hollow fiber membrane module in Example 1 was an immersion type hollow fiber membrane module having the above configuration.
  • the hollow fiber membrane module in Comparative Example 1 was an immersion type hollow fiber membrane module in which the air diffusion holes 11 in Example 1 were not provided.
  • Example 2 The hollow fiber membrane module in Example 2 is the same as the hollow fiber membrane module in Example 1, but is an immersion type hollow in which a conical gas reservoir 12 as shown in FIG. 4 is formed on the gas introduction side of the air diffusion hole 11. A thread membrane module was obtained.
  • the height of the conical shape was 20 mm, and the outer diameter of the bottom surface portion was 43 mm.
  • the small bundle fixing part 10 was formed into a cylindrical shape having an outer diameter of 25 mm (no air diffusion hole), and 150 to 160 hollow fiber membranes were collectively fixed with the end surfaces sealed. .
  • the number of small bundles was 19 bundles so as to achieve the closest packing in the cylindrical container 3.
  • the submerged hollow fiber membrane module in which the number of small bundles is increased without providing the air diffuser holes 11 in the small bundle fixing portion 10 decreases the number of hollow fiber membranes in each small bundle.
  • the effect and the effect of preventing the accumulation of suspended solids are expected to be approximately the same as the effect obtained in the first embodiment, the cost increases due to the increase in the number of members and the number of manufacturing steps, and the cost is not competitive.
  • Test 1 The hollow fiber membrane modules of Example 1 and Comparative Example 1 were immersed in a treated water tank in which Lake Biwa water was stored, and membrane filtration treatment of raw water was performed. Filtration at a suction pressure of 20 kPa for 30 minutes, followed by backwashing with 50 L / m 2 ⁇ hr of filtered water, and suction of a series of treatment cycles in which aeration gas is blown into the module from the bottom of the module at 50 L / min for 1 minute The process was repeated until the pressure reached 70 kPa.
  • Example 1 From the result of Test 1, in Example 1, the diffused gas flows into the small bundle through the diffused holes during the physical cleaning of the hollow fiber membrane module, and the hollow fiber membrane in the vicinity of the small bundle fixing portion can be sufficiently cleaned. And the accumulation of suspended solids on the small bundle fixing part could be greatly reduced.
  • Test 2 Using the hollow fiber membrane modules of Example 1 and Example 2, a test similar to Test 1 described above was performed.
  • Example 2 From the result of Test 2, in Example 2, the total amount of gas per unit time introduced into the small bundle during physical cleaning was increased by providing the gas reservoir on the side where the diffused gas flows into the diffused holes. This shows that the effect obtained in Test 1 is significantly improved by reducing the pressure loss of the gas when passing through the air holes.
  • the hollow fiber membrane module of the present invention can be suitably used for, for example, water purification treatment such as river water, lake water, groundwater, seawater, or membrane separation treatment such as sewage and industrial wastewater.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

Cette invention concerne un module à membranes à fibres creuses formé par insertion de membranes à fibres creuses dans un réceptacle tubulaire. Une extrémité de chacune des membranes à fibres creuses est collée et fixée au réceptacle tubulaire de façon que ces extrémités soient collectées ensemble tandis que leurs surfaces d'extrémité sont ouvertes, les autres extrémités des membranes à fibres creuses respectives étant réparties en petits paquets, lesdits petits paquets définissant une section fixation des petits paquets dans laquelle chacun desdits petits paquets est collé tandis que les surfaces d'extrémité desdites autres extrémités sont scellées. Les sections fixation des petits paquets comportent au moins un orifice de dispersion de gaz pénétrant dans le sens longitudinal des membranes à fibres creuses.
PCT/JP2012/057240 2011-03-28 2012-03-21 Module à membranes à fibres creuses WO2012133068A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2012543385A JPWO2012133068A1 (ja) 2011-03-28 2012-03-21 中空糸膜モジュール

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-069553 2011-03-28
JP2011069553 2011-03-28

Publications (1)

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WO2012133068A1 true WO2012133068A1 (fr) 2012-10-04

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111659258A (zh) * 2020-06-01 2020-09-15 江苏诺莱智慧水务装备有限公司 一种新型气水混合中空纤维超滤膜组件
CN112105445A (zh) * 2018-06-27 2020-12-18 株式会社可乐丽 中空纤维膜组件以及其清洗方法
US11141699B2 (en) * 2018-12-07 2021-10-12 Seojin Energy Co., Ltd. Integral type immersed hollow fiber membrane module equipment for air scouring

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62197108A (ja) * 1986-02-25 1987-08-31 Nitto Electric Ind Co Ltd 中空糸膜フイルタ−
JPH02241523A (ja) * 1989-03-16 1990-09-26 Sumitomo Bakelite Co Ltd 中空糸膜モジュール
JPH04110023A (ja) * 1990-08-31 1992-04-10 Japan Organo Co Ltd 中空糸膜を用いる濾過塔のスクラビング方法
JP2000157846A (ja) * 1998-11-26 2000-06-13 Asahi Chem Ind Co Ltd 中空糸膜カートリッジ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62197108A (ja) * 1986-02-25 1987-08-31 Nitto Electric Ind Co Ltd 中空糸膜フイルタ−
JPH02241523A (ja) * 1989-03-16 1990-09-26 Sumitomo Bakelite Co Ltd 中空糸膜モジュール
JPH04110023A (ja) * 1990-08-31 1992-04-10 Japan Organo Co Ltd 中空糸膜を用いる濾過塔のスクラビング方法
JP2000157846A (ja) * 1998-11-26 2000-06-13 Asahi Chem Ind Co Ltd 中空糸膜カートリッジ

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112105445A (zh) * 2018-06-27 2020-12-18 株式会社可乐丽 中空纤维膜组件以及其清洗方法
CN112105445B (zh) * 2018-06-27 2023-01-10 株式会社可乐丽 中空纤维膜组件以及其清洗方法
US11141699B2 (en) * 2018-12-07 2021-10-12 Seojin Energy Co., Ltd. Integral type immersed hollow fiber membrane module equipment for air scouring
CN111659258A (zh) * 2020-06-01 2020-09-15 江苏诺莱智慧水务装备有限公司 一种新型气水混合中空纤维超滤膜组件

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