WO2022114222A1 - 中空糸膜モジュールの洗浄方法 - Google Patents

中空糸膜モジュールの洗浄方法 Download PDF

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Publication number
WO2022114222A1
WO2022114222A1 PCT/JP2021/043885 JP2021043885W WO2022114222A1 WO 2022114222 A1 WO2022114222 A1 WO 2022114222A1 JP 2021043885 W JP2021043885 W JP 2021043885W WO 2022114222 A1 WO2022114222 A1 WO 2022114222A1
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WO
WIPO (PCT)
Prior art keywords
hollow fiber
fiber membrane
cleaning
membrane module
filtration
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.)
Ceased
Application number
PCT/JP2021/043885
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
大祐 岡村
豊 五條
勇司 木村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Asahi Kasei Corp
Asahi Chemical Industry Co Ltd
Original Assignee
Asahi Kasei Corp
Asahi Chemical Industry Co Ltd
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 Asahi Kasei Corp, Asahi Chemical Industry Co Ltd filed Critical Asahi Kasei Corp
Priority to JP2022565508A priority Critical patent/JPWO2022114222A1/ja
Priority to US18/035,197 priority patent/US20240009628A1/en
Priority to CN202180080557.9A priority patent/CN116568384A/zh
Priority to CN202310894396.8A priority patent/CN117298867A/zh
Publication of WO2022114222A1 publication Critical patent/WO2022114222A1/ja
Priority to US18/143,803 priority patent/US20230271140A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • B01D63/021—Manufacturing thereof
    • B01D63/0233—Manufacturing thereof forming the bundle
    • 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
    • B01D63/031—Two or more types of hollow fibres within one bundle or within one potting or tube-sheet
    • 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
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • 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
    • B01D2321/02—Forward flushing
    • 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
    • B01D2321/18—Use of gases
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/145—Ultrafiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/147—Microfiltration
    • 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
    • B01D63/021—Manufacturing thereof
    • B01D63/022—Encapsulating hollow fibres
    • 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
    • B01D63/024—Hollow fibre modules with a single potted end
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/16—Regeneration of sorbents, filters

Definitions

  • the present invention relates to a method for cleaning a hollow fiber membrane module used for filtering raw water containing a turbid component.
  • Membrane filtration is used in the process of treating suspended water such as river water, lake water, underground water, industrial water raw water, sewage, sewage secondary treated water, industrial wastewater, domestic wastewater, rabbit urine, and seawater. There are many.
  • the advantage of the membrane filtration method is (1) The turbidity level of the obtained water quality is high and stable, and therefore the safety of the obtained water is high. (2) The installation space for the filtration device is small, (3) Easy automatic operation, And so on.
  • Hollow filament-shaped ultrafiltration membranes are mainly used for the turbidity operation by membrane filtration.
  • a porous organic membrane made of a synthetic resin is often used.
  • Patent Document 1 describes a polyvinylidene fluoride-based porous membrane, and discloses that this is used as a hollow fiber membrane.
  • the turbid components (inorganic substances and organic substances) contained in the raw water are blocked by the filtration membrane and removed.
  • turbid components in the raw water are deposited on the filtration membrane, which causes concentration polarization, formation of a cake layer, or clogging of the membrane.
  • concentration polarization concentration polarization
  • formation of a cake layer or clogging of the membrane.
  • permeation flow rate decreases as the filtration continues. Therefore, in the membrane filtration treatment of raw water, the membrane is regularly washed.
  • Patent Document 2 discloses a cleaning method in which a bubble nozzle is arranged sideways or below the hollow fiber membrane in the casing of the module, and backwashing and gas ejection from the nozzle are performed at the same time.
  • Patent Document 3 discloses a cleaning method in which a gas is introduced from the raw water side of the module and at the same time the gas or liquid is passed from the filtered water side of the hollow fiber membrane to the raw water side.
  • Patent Documents 2 and 3 are effective methods for removing turbidity components deposited on the hollow fiber membrane, and contribute to the stable operation of raw water filtration using the hollow fiber membrane module.
  • the conventional cleaning methods represented by Patent Documents 2 and 3 are still inadequate in cleaning efficiency from the viewpoint of process design when the hollow fiber membrane module is used for a long period of time.
  • the cleaning efficiency can be improved and the performance of the hollow fiber membrane module after 10 years can be improved to, for example, 90% of the initial performance
  • an object of the present invention is firstly to provide a method for cleaning a hollow fiber membrane module in which deterioration of filtration performance when the hollow fiber membrane module is used for a long period of time is extremely suppressed.
  • an object of the present invention is secondly, when the filtration operation using the porous hollow fiber membrane involves a cleaning step, the cleaning efficiency is excellent, the deterioration of the filtration performance with time is suppressed, and the hollow fiber membrane is suppressed. And to provide a hollow fiber membrane module that does not impair the life of the module containing the same.
  • a method for cleaning a hollow fiber membrane module including a hollow fiber membrane for filtering raw water containing a turbid component The first cleaning step of removing the turbid component accumulated on the hollow fiber membrane, and At least, a second cleaning step of passing gas through the raw water side of the hollow fiber membrane, performing an air scrubbing treatment, and the like are included in this order. In the first cleaning step, 50% by volume or more of the capacity of the hollow fiber membrane module is removed from the water existing in the hollow fiber membrane module before cleaning. How to clean the hollow fiber membrane module.
  • ⁇ Aspect 2 The method for cleaning a hollow fiber membrane module according to Aspect 1, wherein the first cleaning step is a step of performing at least one of the following treatments (A1) to (A3).
  • A1 Backflow cleaning treatment in which water is passed from the filtered water side of the hollow fiber membrane to the raw water side;
  • A2) Flushing treatment in which water is passed to the raw water side of the hollow fiber membrane;
  • A3) Drain treatment in which the liquid in the hollow fiber membrane module is discharged.
  • Aspect 3 The method for cleaning a hollow fiber membrane module according to Aspect 1 or 2, wherein in the first cleaning step, 7% by mass or more of the turbid component deposited on the hollow fiber membrane is removed.
  • Aspect 4 The method for cleaning a hollow fiber membrane module according to Aspect 1 or 2, wherein the second cleaning step is a step of performing any of the following 6 (B1) to (B3).
  • B1 A step of performing only an air scrubbing process in which a gas is passed through the raw water side of the hollow fiber membrane;
  • B2 A step of simultaneously performing an air scrubbing treatment for passing gas through the raw water side of the hollow fiber membrane and a backflow cleaning treatment for passing water from the filtered water side to the raw water side of the hollow fiber membrane; and (B3).
  • a third cleaning step of discharging the turbid component to the outside of the hollow fiber membrane module is further included.
  • ⁇ Aspect 6 >> The method for cleaning a hollow fiber membrane module according to Aspect 5, wherein the third cleaning step is a step of performing at least one of the following treatments (C1) and (C2).
  • the hollow fiber membrane module is A bundle of hollow fiber membranes consisting of multiple hollow fiber membranes, The housing in which the hollow fiber membrane bundle is housed and An adhesive fixing portion for adhesively fixing both ends of the hollow fiber membrane bundle and the housing, An introduction port that communicates the outside of the hollow fiber membrane module with the outer space of the hollow fiber membrane, A filtration water port that communicates the outside of the hollow fiber membrane module with the inner space of the hollow fiber membrane, The method for cleaning a hollow fiber membrane module according to any one of aspects 1 to 6, further comprising a cleaning discharge port that communicates the outside of the hollow fiber membrane module with the outer space of the hollow fiber membrane.
  • ⁇ Aspect 8 The method for cleaning a hollow fiber membrane module according to aspect 7, wherein the hollow fiber membrane is a microfiltration (MF) membrane or an ultrafiltration (UF) membrane.
  • MF microfiltration
  • UF ultrafiltration
  • the adhesive fixing portion is At one end of the hollow fiber membrane, a first adhesive fixing layer for adhering and fixing the hollow fiber membranes, the hollow fiber membrane bundle, and the inner wall of the housing with a resin material.
  • a second adhesive fixing layer for adhesively fixing the hollow fiber membranes to each other, the hollow fiber membrane bundle, and the inner wall of the housing with a resin material is provided.
  • the hollow fiber membrane is a microfiltration (MF) membrane or an ultrafiltration (UF) membrane.
  • the adhesive fixing portion is At one end of the hollow fiber membrane, a first adhesive fixing layer for adhering and fixing the hollow fiber membranes, the hollow fiber membrane bundle, and the inner wall of the housing with a resin material.
  • a second adhesive fixing layer for adhesively fixing the hollow fiber membranes to each other, the hollow fiber membrane bundle, and the inner wall of the housing with a resin material is provided.
  • the hollow fiber membrane module is An inlet that communicates the outside of the hollow fiber membrane module with the space outside the hollow fiber membrane. It is provided with a filtration water port that communicates the outside of the hollow fiber membrane module with the space inside the hollow fiber membrane, and a cleaning discharge port that communicates the outside of the hollow fiber membrane module with the space outside the hollow fiber membrane.
  • ⁇ Aspect 13 In the first adhesive fixing layer, the hollow portion of the hollow fiber membrane is open. In the second adhesive fixing layer, the hollow portion of the hollow fiber membrane is sealed.
  • ⁇ Aspect 15 >> A filtration method for filtering raw water using the hollow fiber membrane module according to any one of the above aspects 10 to 14.
  • the filtration method is A filtration step of passing raw water through the hollow fiber membrane to obtain filtered water by external pressure filtration; and a cleaning step performed after the filtration step.
  • the cleaning step is the cleaning method according to any one of aspects 1 to 6.
  • ⁇ Aspect 16 >> A filtration method for filtering raw water using the hollow fiber membrane module according to any one of the above aspects 10 to 14.
  • the filtration method is A filtration step of passing raw water through the hollow fiber membrane to obtain filtered water by external pressure filtration; and a cleaning step performed after the filtration step.
  • the cleaning step is The first cleaning step of backflow cleaning or flushing and the second cleaning step are included in this order.
  • the second cleaning step is Backflow cleaning that allows the filtered water to pass from the inside to the outside of the hollow fiber membrane, or flushing that introduces raw water from the introduction port and discharges it from the cleaning discharge port.
  • Raw water containing air bubbles is introduced from the introduction port, discharged from the cleaning discharge port, and the hollow fiber membrane is shaken by the air bubbles, which is combined with air scrubbing to clean the outer surface of the hollow fiber membrane.
  • ⁇ Aspect 17 >> After the first cleaning step and the second cleaning step, a third cleaning step is further included.
  • C1 Flushing treatment in which water is passed through the raw water side of the hollow fiber membrane; and
  • C2) Backflow cleaning treatment in which water is passed from the filtered water side of the hollow fiber membrane to the raw water side.
  • the cleaning step comprises a draining step of draining the cleaning drainage on the outside and the hollow portion of the hollow fiber membrane from the introduction port or the cleaning discharge port.
  • ⁇ Aspect 19 The filtration method according to aspect 18, wherein the discharge step is a step of introducing compressed air into the introduction port or the cleaning discharge port and forcibly discharging the cleaning drainage.
  • ⁇ Aspect 20 The filtration method according to any one of aspects 16 to 19, wherein the average turbidity of the raw water is 10 degrees or more.
  • a method for cleaning a hollow fiber membrane module in which deterioration of filtration performance when the hollow fiber membrane module is used for a long period of time is extremely suppressed.
  • FIG. 1 It is a schematic cross-sectional view which shows an example of the structure of the hollow fiber membrane module to which the method of cleaning a hollow fiber membrane module of this invention is applied. It is a flow chart of an example of a filtration system for carrying out the cleaning method of the hollow fiber membrane module of this invention.
  • the method for cleaning the hollow fiber membrane module of the present invention is as follows.
  • the first cleaning step of removing the turbid component accumulated on the hollow fiber membrane, and At least, a second cleaning step of passing gas through the raw water side of the hollow fiber membrane, performing an air scrubbing treatment, and the like are included in this order.
  • 50% by volume or more of the capacity of the hollow fiber membrane module is removed from the water existing in the hollow fiber membrane module before cleaning. This is a method for cleaning the hollow fiber membrane module.
  • a hollow fiber membrane module in which a plurality of hollow fibers are filled in a casing is preferably used because the membrane area per unit volume is large and the filtration efficiency is high.
  • the hollow fiber membrane module includes an external pressure type filtered hollow fiber membrane module that supplies raw water to the outer surface side of the hollow fiber membrane and passes it through the inner surface side to filter, and supplies raw water to the inner surface side of the hollow fiber membrane.
  • the external pressure type filtered hollow fiber membrane module has a larger effective membrane area per unit volume than the internal pressure type filtered hollow fiber membrane module, so that in fields where reduction of water production cost is required, for example, in the process of water purification production. It's being used.
  • the hollow fiber membrane module to which the cleaning method of the present invention is applied is A bundle of hollow fiber membranes consisting of multiple hollow fiber membranes, A housing containing a bundle of hollow fiber membranes and Adhesive fixing parts that bond and fix both ends of the hollow fiber membrane bundle and the housing, An inlet that communicates the outside of the hollow fiber membrane module with the outer space of the hollow fiber membrane, A filtration water port that communicates the outside of the hollow fiber membrane module with the inside space of the hollow fiber membrane, It has a cleaning outlet that communicates the outside of the hollow fiber membrane module with the outer space of the hollow fiber membrane. It is preferably a hollow fiber membrane module.
  • the above adhesive fixing part is At one end of the hollow fiber membrane, a first adhesive fixing layer for adhering and fixing the hollow fiber membranes, the hollow fiber membrane bundle, and the inner wall of the housing with a resin material, At the other end of the hollow fiber membrane, a second adhesive fixing layer may be provided for adhesively fixing the hollow fiber membranes, the hollow fiber membrane bundle, and the inner wall of the housing with a resin material.
  • the hollow fiber membrane module to which the cleaning method of the present invention is applied is preferably A bundle of hollow fiber membranes consisting of multiple hollow fiber membranes, A housing containing a bundle of hollow fiber membranes and A hollow fiber membrane module provided with an adhesive fixing portion for adhesively fixing both ends of the hollow fiber membrane bundle to the housing.
  • Hollow fiber membranes are microfiltration (MF) membranes or ultrafiltration (UF) membranes.
  • the adhesive fixing part is At one end of the hollow fiber membrane, a first adhesive fixing layer for adhering and fixing the hollow fiber membranes, the hollow fiber membrane bundle, and the inner wall of the housing with a resin material, At the other end of the hollow fiber membrane, a second adhesive fixing layer for adhesively fixing the hollow fiber membranes, the hollow fiber membrane bundle, and the inner wall of the housing with a resin material is provided.
  • Hollow fiber membrane module An inlet that communicates the outside of the hollow fiber membrane module with the space outside the hollow fiber membrane, Hollow fiber membrane with a filtering water port that communicates between the outside of the hollow fiber membrane module and the space inside the hollow fiber membrane, and a cleaning outlet that communicates between the outside of the hollow fiber membrane module and the space outside the hollow fiber membrane. It is a filament membrane module.
  • the hollow fiber membrane module to which the cleaning method of the present embodiment is applied has the following conditions (A), (B), and (C):
  • (B) The outer diameter of the hollow fiber membrane is 1.1 mm or less; and
  • (C) the total membrane area of the hollow fiber membrane is 70 m 2 or more; It is particularly preferable to satisfy all of the above.
  • the hollow fiber membrane module satisfying all of the conditions (A), (B), and (C) does not need to perform the first cleaning step in the cleaning step, and has a high cleaning effect without performing the first cleaning step. can get.
  • the hollow fiber membrane bundle in the hollow fiber membrane module of the present embodiment is composed of a plurality of hollow fiber membranes and is housed in a housing for use. It is preferable that the number of hollow fiber membranes in the hollow fiber membrane bundle is appropriately set so as to satisfy a predetermined filling rate when stored in the housing.
  • the number of hollow fiber membranes in the hollow fiber membrane bundle is, for example, 1,000 or more and 100,000 or less, 2,000 or more and 50,000 or less, 3,000 or more and 40,000 or less. Alternatively, the number may be 5,000 or more and 30,000 or less.
  • the hollow fiber membrane in the hollow fiber membrane module of the present embodiment is a microfiltration (MF) membrane or an ultrafiltration (UF) membrane. Therefore, the average pore diameter of the hollow fiber membrane is preferably 1 nm (0.001 ⁇ m) or more and 10 ⁇ m or less, preferably 10 nm (0.01 ⁇ m) or more and 700 nm (0.7 ⁇ m) or less, and 20 nm (0.02 ⁇ m) or more. More preferably, it is 600 nm (0.6 ⁇ m) or less. When the average pore diameter is 30 nm (0.03 ⁇ m) or more and 400 nm (0.4 ⁇ m) or less, the separation performance is sufficient and the communication of the pores can be ensured.
  • the average pore diameter of the hollow fiber membrane can be measured by a measuring method (also known as a half-dry method) of an average pore diameter (mean flow pore size) defined in ASTM: F316-86.
  • the surface aperture ratio of the hollow fiber membrane is preferably 25 to 60%, more preferably 25 to 50%, and even more preferably 25 to 45%.
  • This surface opening ratio is the surface opening ratio of the surface of the hollow fiber membrane on the side that comes into contact with raw water (preferably the outer surface of the hollow fiber membrane).
  • raw water preferably the outer surface of the hollow fiber membrane.
  • the surface opening ratio of the surface on the side in contact with raw water is 25% or more, clogging of the membrane and deterioration of water permeability due to scratching of the surface of the membrane can be suppressed, so that filtration is stable. It can enhance the sex.
  • the surface aperture ratio is too high, the required separation performance may not be exhibited.
  • the magnification of the electron micrograph should be set as follows, for example, according to the cumulative medium diameter (hole diameter corresponding to the cumulative area value of 50%) of the holes opened on the outer surface of the hollow fiber membrane.
  • Magnification 1,000 to 5,000 times When the cumulative median diameter is about 0.1 to 1 ⁇ m 5,000 to 20,000 times
  • the cumulative median diameter is 0.03 to When it is about 0.1 ⁇ m, it is 10,000 to 50,000 times.
  • the black-and-white binarization process may be performed by a commercially available image analysis system using an electron micrograph or a copy thereof.
  • the porosity of the hollow fiber membrane is preferably 50 to 80%, more preferably 55 to 65%. When the porosity is 50% or more, the water permeability is high, while when it is 80% or less, the mechanical strength can be increased.
  • the inner diameter of the hollow fiber membrane is preferably 0.10 to 1.00 mm, more preferably 0.30 to 0.80 mm.
  • the outer diameter of the hollow fiber membrane is 1.10 mm or less, preferably 0.3 to 1.05 mm, and more preferably 0.5 to 1.00 mm.
  • the film thickness of the hollow fiber membrane is preferably 80 to 1,000 ⁇ m, and more preferably 100 to 300 ⁇ m. When the film thickness is 80 ⁇ m or more, the strength of the film can be secured, while when the film thickness is 1000 ⁇ m or less, the pressure loss due to the film resistance can be suppressed.
  • the hollow fiber membrane in the hollow fiber membrane module of the present embodiment is preferably made of a porous membrane made of synthetic resin.
  • the resin constituting the hollow fiber membrane in the present embodiment is preferably a thermoplastic resin, and more preferably polyolefin.
  • the polyolefin include polyethylene, polypropylene, polyvinyl alcohol, ethylene-vinyl alcohol copolymers, fluororesins, and mixtures thereof.
  • fluororesin examples include vinylidene fluoride resin (PVDF), chlorotrifluoroethylene resin, tetrafluoroethylene resin, ethylene-tetrafluoroethylene copolymer (ETFE), and ethylene-monochromelotrifluoroethylene copolymer (ECTFE).
  • PVDF vinylidene fluoride resin
  • ETFE ethylene-tetrafluoroethylene copolymer
  • ECTFE ethylene-monochromelotrifluoroethylene copolymer
  • examples include those selected from the group consisting of ethylene-chlorotrifluoroethylene copolymers, vinylidene polyvinylfluoride (which may contain a domain of hexafluoropropylene), hexafluoropropylene resins, and mixtures of these resins.
  • the fluororesin is particularly preferable as the resin constituting the hollow fiber membrane in the present embodiment.
  • These resins are excellent as materials for hollow fiber membranes because they are easy to handle and tough.
  • one homopolymer selected from the group consisting of vinylidene fluoride, tetrafluoroethylene, hexafluoropropylene, ethylene, tetrafluoroethylene, and chlorotrifluoroethylene, or two or more kinds selected from the above group.
  • a mixture of the homopolymer and the copolymer is preferable because it has excellent mechanical strength, chemical strength (chemical resistance), and good moldability.
  • fluororesins such as polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, ethylene-tetrafluoroethylene copolymer, and ethylene-chlorotrifluoroethylene copolymer are preferable.
  • the thermoplastic resin constituting the hollow fiber membrane in the present embodiment has a three-dimensional network structure instead of a spherulite structure. Since the hollow fiber membrane is made of a thermoplastic resin having a three-dimensional network structure, the communication of pores from the inner surface to the outer surface of the hollow fiber membrane can be further improved.
  • the initial value of the tensile elongation at break of the hollow fiber membrane is preferably 60% or more, more preferably 80% or more, further preferably 100% or more, and particularly preferably 120% or more.
  • the compressive strength of the hollow fiber membrane is preferably 0.2 MPa or more, more preferably 0.3 to 1.0 MPa, and further preferably 0.4 to 1.0 MPa.
  • the hollow fiber membrane in the present embodiment can be manufactured by a known method or a method appropriately modified by those skilled in the art.
  • the hollow fiber membrane in the present embodiment can be produced, for example, by extrusion molding of a melt-kneaded product containing a raw material thermoplastic resin.
  • the housing in the hollow fiber membrane module of the present embodiment houses the hollow fiber membrane bundle. After the housing and the hollow fiber membrane bundle are fixed by the adhesive fixing portion described later to form a hollow fiber membrane module, the inside of the module is divided into an outer space of the hollow fiber membrane and an inner space of the hollow fiber membrane. These spaces will have a structure in which they are in contact with each other via the hollow fiber membrane.
  • the housing in this embodiment includes an introduction port, a filtered water port, and a cleaning discharge port. These inlets, filtered water outlets, and cleaning outlets are the hollow fiber membrane module introduction port, the filtered water outlet, and the cleaning outlet after the housing and the hollow fiber membrane bundle are fixed by the adhesive fixing portion described later. As such, each has the following functions.
  • Introductory port Function to communicate the outside of the module with the outer space of the hollow fiber membrane
  • Filtration water port Function to communicate the outside of the module with the inner space of the hollow fiber membrane
  • Cleaning outlet The outside of the module and the outside of the hollow fiber membrane Function to communicate with space
  • the housing may have a first tubular member for accommodating the hollow fiber membrane bundle and a second tubular member for arranging the adhesive fixing portion.
  • the second tubular member is preferably arranged at both ends of the first tubular member.
  • the second tubular member may have the above-mentioned introduction port, filtered water port, and cleaning discharge port.
  • the second tubular member is preferably arranged on the side from which the filtered liquid of the hollow fiber membrane module is taken out, and introduces the second tubular member A having a filtration water port and a cleaning discharge port, and the raw water of the hollow fiber membrane module. It may be composed of a second tubular member B which is arranged on the side and has an introduction port.
  • the inner diameter of the first cylindrical member of the housing is preferably 170 mm or more, more preferably 190 mm or more, preferably 250 mm or less, and more preferably 230 mm or less.
  • the outer diameter of the first cylindrical member may be, for example, 170 mm or more and 300 mm or less.
  • the length of the first tubular member may be appropriately set according to the desired effective length of the hollow fiber membrane, and may be, for example, 1.0 m or more and 3.0 m or less, and 1.5 m or more and 2.0 m or less. Is preferable.
  • the inner diameter of the second tubular member of the housing may be larger than the inner diameter of the first tubular member, preferably 180 mm or more, more preferably 200 mm or more, preferably 280 mm or less, and more preferably 250 mm. It is as follows.
  • the outer diameter of the second tubular member may be, for example, 180 mm or more and 330 mm or less.
  • the length of the second tubular member may be appropriately set, and may be, for example, 0.2 m or more and 1.0 m or less.
  • the material of the housing may be appropriately set from the viewpoints of moldability, cost, mechanical durability, chemical durability, etc., and is selected from, for example, stainless steel, ABS, PVC, nylon, PSF, PE, PP, PPE and the like. It is preferably made of the material to be used.
  • the hollow fiber membrane bundle and the housing are fixed by an adhesive fixing portion.
  • the adhesive fixing portion in the hollow fiber membrane module of the present embodiment has a function of adhesively fixing both ends of the hollow fiber membrane bundle and the housing.
  • This adhesive fixing part is At one end of the hollow fiber membrane, a first adhesive fixing layer for adhering and fixing the hollow fiber membranes, the hollow fiber membrane bundle, and the inner wall of the housing with a resin material, At the other end of the hollow fiber membrane, a second adhesive fixing layer for adhesively fixing the hollow fiber membranes, the hollow fiber membrane bundle, and the inner wall of the housing with a resin material is provided.
  • the material constituting the first adhesive fixing layer and the second adhesive fixing layer of the adhesive process portion is a resin material.
  • this resin material include urethane resin, epoxy resin, acrylic resin, silicone resin and the like.
  • a regulating member for regulating the arrangement of the hollow fiber membrane may be provided in the adhesive fixing portion of the hollow fiber membrane module. However, it is preferable that there is no restricting member in the adhesive fixing portion because the substantially abundance density of the hollow fiber membrane becomes small and the turbidity in the raw water is easily discharged.
  • the first adhesive fixing layer has a function of adhering and fixing the hollow fiber membranes to each other, the hollow fiber membrane bundle, and the inner wall of the housing at one end of the hollow fiber membrane.
  • the first adhesive fixing layer may be arranged inside the second tubular member A.
  • the first adhesive fixing layer is arranged inside the second tubular member A so as to block the drain port and the cleaning discharge port, and the inside of the second tubular member A is on the filter side. It is divided into a space and a space for a cleaning outlet. Then, in the first adhesive fixing layer, it is preferable that the hollow portion of the hollow fiber membrane is open.
  • the inner space of the hollow fiber membrane communicates with the outside of the hollow fiber membrane module via the space on the filter side inside the second tubular member A, and
  • the outer space of the hollow fiber membrane communicates with the outside of the hollow fiber membrane module via the space on the cleaning discharge port side inside the second tubular member A. Therefore, the cleaning drainage and the like in the outer space of the hollow fiber membrane and the filtered water in the inner space of the hollow fiber membrane can be separately taken out to the outside of the hollow fiber membrane module.
  • the second adhesive fixing layer has a function of adhering and fixing the hollow fiber membranes to each other and the hollow fiber membrane bundle and the inner wall of the housing at the other end of the hollow fiber membrane (the end opposite to the first adhesive fixing layer).
  • the second adhesive fixing layer may be arranged inside the second tubular member B.
  • the second adhesive fixing layer preferably has a hole penetrating the second adhesive fixing layer. Then, in the second adhesive fixing layer, it is preferable that the hollow portion of the hollow fiber membrane is sealed.
  • the outer space of the hollow fiber membrane communicates with the outside of the hollow fiber membrane module through the space inside the second tubular member B and the hole penetrating the second adhesive fixing layer. ..
  • the diameter of the holes of the second adhesive fixing layer is preferably 5 or more and 30 mm or less, and the number of holes is preferably 5 or more and 100 or less.
  • the shape of the hole can be selected from, for example, a circular shape, an elliptical shape, a rectangular shape, a polygonal shape, or a combination thereof, or may be an indeterminate shape.
  • the hollow fiber membrane module of the present embodiment has the following conditions (A), (B), and (C): (A) The filling rate of the hollow fiber membrane, which is expressed as a ratio of the total cross-sectional area of the hollow fiber membrane to the internal cross-sectional area of the housing, is 38% or less; (B) The outer diameter of the hollow fiber membrane is 1.1 mm or less; and (C) the membrane area of the hollow fiber membrane module is 70 m 2 or more; It is preferable to satisfy all of.
  • the "filling rate of the hollow fiber membrane” is the ratio of the hollow fiber membrane cross-sectional area calculated by “total hollow fiber membrane cross-sectional area / housing internal cross-sectional area", and the hollow fiber membrane cross-sectional area here. Refers to the total cross-sectional area including the hollow portion of the membrane.
  • the "cross-sectional area inside the housing” is the cross-sectional area inside the first tubular member that houses the hollow fiber membrane bundle. Point to.
  • the hollow fiber membrane module of the present embodiment it is preferable to use a relatively thin hollow fiber membrane having an outer diameter of 1.1 mm or less. As a result, even if the filling rate of the hollow fiber membrane is as low as 38%, the total membrane area of the hollow fiber membrane bundle can be increased. Further, by lowering the filling rate of the hollow fiber membrane to 38% or less, it is advantageous in that the dischargeability of turbidity is improved and a large film area can be secured.
  • the filling rate of the hollow fiber membrane is preferably 38% or less, more preferably 37% or less, from the viewpoint of turbidity discharge property.
  • the filling rate of the hollow fiber membrane is preferably 30% or more, more preferably 35% or more.
  • the effective length of the hollow fiber membrane is preferably 1.5 m or more, more preferably 1.6 m or more, still more preferably 1.7 m or more, and particularly preferably 1.8 m or more. That is all.
  • the effective length of the hollow fiber membrane means the length of the hollow fiber membrane that contributes to filtration, and is the length of the hollow fiber membrane exposed between the first adhesive fixing layer and the second adhesive fixing layer. Means the average value of.
  • the total membrane area of the hollow fiber membrane is preferably 70 m 2 or more, more preferably 80 m 2 or more, and further preferably 90 m 2 or more. Since the hollow fiber membrane module of the present embodiment has a large total membrane area of the hollow fiber membrane, it has an advantage of high filtration efficiency.
  • the total membrane area of the hollow fiber membrane means the total membrane area (effective membrane area) of the hollow fiber membrane that contributes to filtration, and is between the first adhesive fixing layer and the second adhesive fixing layer of the hollow fiber membrane. Refers to the total outer area of the exposed part.
  • the hollow fiber membrane module of this embodiment has a large footprint.
  • the "footprint” is defined as a value obtained by allocating the total membrane area of the hollow fiber membrane by the cross-sectional area of the first tubular member of the module.
  • This hollow fiber membrane module having a large footprint is preferable because it can treat a large amount of water with a small installation area.
  • the footprint of the hollow fiber membrane module of the present embodiment is preferably 2,500 m 2 / m 2 or more, more preferably 2,600 m 2 / m 2 or more, and further preferably 2,700 m 2 / m 2 or more.
  • the footprint is preferably 5,000 m 2 / m 2 or less, more preferably 4,500 m 2 / m 2 or less. Yes, more preferably 4,000 m 2 / m 2 or less, and in particular 3,500 m 2 / m 2 or less.
  • the hollow fiber membrane module of the present embodiment can be manufactured by, for example, the following method. First, a predetermined number of hollow fiber membranes are arranged as a bundle to prepare a hollow fiber membrane bundle. Subsequently, the hollow fiber membrane bundle is hung vertically, and the lower end portion is trimmed. Further, in order to specify the circumference, the outer circumference of the hollow fiber membrane bundle is fixed with tape. After that, the lower end surface of the hollow fiber membrane is impregnated with an adhesive, for example, urethane resin and cured to fix the hollow fiber membrane bundle at a predetermined diameter and seal the hollow portion of the lower end surface. ..
  • an adhesive for example, urethane resin
  • a housing is formed and a hollow is formed inside the housing.
  • the filament membrane bundle is stored.
  • the side where the hollow portion of the hollow fiber membrane bundle is sealed is inserted so as to be located on the second tubular member A side.
  • a rectifying cylinder may be installed inside the second tubular member A.
  • a columnar member for forming a hole penetrating the second adhesive fixing layer is inserted at a position of the end of the hollow fiber membrane bundle where the formation of the second adhesive fixing layer is planned.
  • the diameter and number of columnar members are set according to the desired diameter and number of holes.
  • a potting material for example, urethane resin
  • the housing into which the potting material is injected is rotated in the horizontal direction to perform centrifugal adhesion to form an adhesive fixing portion (first adhesive fixing layer and second adhesive fixing layer).
  • the columnar member for forming the hole is removed to form a through hole.
  • the hollow fiber membrane module of the present embodiment can be obtained by cutting the end portion of the first adhesive fixing layer and opening the end portion of the hollow fiber membrane bundle on the filtration water port side.
  • FIG. 1 shows an example of the structure of an external pressure type filtered hollow fiber membrane module to which the method for cleaning the hollow fiber membrane module of the present embodiment is preferably applied as a schematic cross-sectional view.
  • the hollow fiber membrane module (100) of FIG. 1 is A hollow fiber membrane bundle (10) composed of a plurality of hollow fiber membranes (11), The housing (30) in which the hollow fiber membrane bundle (10) is housed, and An adhesive fixing portion (20) for adhesively fixing both ends of the hollow fiber membrane bundle (10) and a housing (30), An introduction port (1) that communicates the outside of the hollow fiber membrane module (100) with the outer space (42) of the hollow fiber membrane (11).
  • a filtered water port (2) that communicates the outside of the hollow fiber membrane module (100) with the inner space (41) of the hollow fiber membrane (11). It is provided with a cleaning discharge port (3) that communicates the outside of the hollow fiber membrane module (100) with the outer space (42) of the hollow fiber membrane (11).
  • the housing (30) has a first tubular member (31) for accommodating the hollow fiber membrane bundle (10) and two second tubular members (32A, 32B) for arranging the adhesive fixing portion (20). ), And these two two-cylindrical members are arranged at both ends of the first tubular member (31).
  • the second tubular member is A second tubular member A (32A) arranged on the side of the hollow fiber membrane module (100) from which the filtered water is taken out and having a filtered water port (2) and a cleaning discharge port (3).
  • the hollow fiber membrane module (100) is arranged on the side where the raw water is introduced, and is composed of a second tubular member B (32B) having an introduction port (1).
  • the arrangement positions of the introduction port (1), the filtered water port (2), and the cleaning discharge port (3) are not limited to this embodiment.
  • the adhesive fixing portion (20) is At one end of the hollow fiber membrane (11), the hollow fiber membranes (11) and the inner wall of the hollow fiber membrane bundle (10) and the second tubular member A (32A) of the housing (30) are made of a resin material.
  • the first adhesive fixing layer (21) to be adhesively fixed by At the other end of the hollow fiber membrane (11), the hollow fiber membranes (11) and the hollow fiber membrane bundle (10) and the inner wall of the second tubular member B (32B) of the housing (30) are made of a resin material. It is provided with a second adhesive fixing layer (22) for adhesive fixing.
  • the first adhesive fixing layer (21) is arranged inside the second tubular member A (32A) so as to block the filtered water port (2) and the cleaning discharge port (3), and the second tubular member.
  • the inside of A (32A) is divided into a space on the filtration water port (2) side and a space on the cleaning discharge port (3) side. Then, in the first adhesive fixing layer (21), the hollow portion of the hollow fiber membrane (11) is open.
  • the inner space of the hollow fiber membrane (11) communicates with the outside of the hollow fiber membrane module (100) via the space on the filtration water port (2) side inside the second tubular member A (32A), and
  • the outer space of the hollow fiber membrane (11) communicates with the outside of the hollow fiber membrane module (100) via the space on the cleaning discharge port (3) side inside the second tubular member A (32A).
  • the cleaning drainage and the like in the outer space of the hollow fiber membrane (11) and the filtered water in the inner space of the hollow fiber membrane (11) are separately taken out to the outside of the hollow fiber membrane module (100). Will be possible.
  • the second adhesive fixing layer (22) is arranged inside the second tubular member B (32B).
  • the second adhesive fixing layer (22) has a hole penetrating the second adhesive fixing layer (22). Then, in the second adhesive fixing layer (22), the hollow portion of the hollow fiber membrane (11) is sealed.
  • the outer space of the hollow fiber membrane (11) is formed through the space inside the second tubular member B (32B) and the hole penetrating the second adhesive fixing layer (22). It communicates with the outside of the module (100). Therefore, raw water or the like can be introduced from the outside of the hollow fiber membrane module (100) to the outside of the hollow fiber membrane (11).
  • the hollow fiber membrane module (100) of FIG. 1 further has a rectifying cylinder (50), which is an optional member, inside the second tubular member A of the housing (30).
  • a rectifying cylinder (50) which is an optional member, inside the second tubular member A of the housing (30).
  • the distance between the first adhesive fixing layer (21) and the second adhesive fixing layer (22), which defines the effective length of the hollow fiber membrane (11), is indicated by the reference numeral “L”. ing.
  • the method for cleaning the hollow fiber membrane module of the present invention is as follows.
  • the first cleaning step which removes the turbidity component accumulated on the hollow fiber membrane,
  • a second cleaning step of passing gas through the raw water side of the hollow fiber membrane, performing an air scrubbing treatment, and the like are included in this order.
  • the first cleaning step is preferably a step of performing at least one of the following treatments (A1) to (A3).
  • A1 Backflow washing (backwashing) treatment in which water passes from the filtered water side of the hollow fiber membrane to the raw water side;
  • A3) Drain treatment for discharging the liquid in the hollow fiber membrane module.
  • the second cleaning step is a step of removing the turbidity component from the hollow fiber membrane by the first cleaning step, preferably outside the module.
  • at least an air scrubbing process is performed.
  • the second cleaning step is preferably a step of performing any of the following (B1) to (B3).
  • the method for cleaning the hollow fiber membrane module of the present invention is planned to be performed following a filtration step of filtering raw water by the hollow fiber membrane module.
  • the hollow fiber membrane module is planned to be continuously operated for a long period of time by repeatedly performing the filtration step and each cleaning step of the method for cleaning the hollow fiber membrane module of the present invention.
  • the timing for stopping the filtration process and starting the cleaning process may be appropriately set. For example, after starting or restarting the filtration process, the filtration process may be stopped and the cleaning process may be started when a predetermined predetermined time has elapsed. Alternatively, when the water permeability of the filtration step reaches a predetermined value set in advance, the filtration step may be stopped and the cleaning step may be started.
  • backwash is “BW”
  • flushing is “FL”
  • drain is “DL”
  • air scrubbing is “AS”
  • backwash and air scrubbing are performed at the same time (backwash-air scrubbing simultaneous wash). )
  • ASBW backwash-air scrubbing simultaneous wash
  • ASFL simultaneous implementation of flushing and air scrubbing (flushing-air scrubbing simultaneous cleaning)
  • ⁇ Filtration process> In the filtration step, raw water is provided to the raw water side of the hollow fiber membrane, the insoluble matter in the raw water is captured by the hollow fiber membrane, and the filtered water is impregnated into the filtered water side of the hollow fiber membrane to obtain filtered water.
  • the hollow fiber membrane module is an external pressure type filtered hollow fiber membrane module, raw water is provided from the outside of the hollow fiber membrane, and the raw water is passed through the hollow fiber membrane by external pressure filtration to obtain filtered water.
  • the raw water in the filtration step is not particularly limited, and is typically water containing suspended solids that can be removed by the filtration step, such as natural water, wastewater, process process liquid, and treated water thereof.
  • natural water include river water, lake water, groundwater, and seawater.
  • Wastewater is sewage and factory wastewater.
  • Process process liquid refers to a mixed liquid before separating valuable and non-valuable resources in the fields of foods, pharmaceuticals, semiconductor manufacturing, and the like.
  • These raw waters contain turbid substances (rot colloids, organic colloids, clays, bacteria, etc.) consisting of one or more of fine organic substances and inorganic substances of the order of ⁇ m or less, and organic-inorganic mixtures, and high levels derived from bacteria and algae. It may contain a molecular substance or the like.
  • the quality of raw water can be defined by turbidity and / or organic matter concentration. Both the turbidity and the organic matter concentration are evaluated as average values, not instantaneous values. Based on the turbidity, raw water is classified into low turbidity with turbidity of less than 1, medium turbidity with turbidity of 1 or more and less than 10, highly turbid water with turbidity of 10 or more and less than 50, and ultra-high turbidity with turbidity of 50 or more. To. Based on the organic material concentration (total organic carbon (TOC): mg / L), the raw water is low TOC water of less than 1 and medium TOC water of 1 or more and less than 4, and high of 4 or more and less than 8.
  • TOC total organic carbon
  • the average turbidity of the raw water supplied to the filtration step in the present embodiment is 10 degrees or more because the performance of the hollow fiber membrane module of the present embodiment can be suitably exhibited.
  • the hollow fiber membrane module is an external pressure type filtered hollow fiber membrane module
  • the hollow fiber membrane is used.
  • the filtrate is exuded from the inner surface of the hollow fiber membrane as the filtrate that has passed through the thick portion of the hollow fiber membrane, and the filtrate in the inner space of the hollow fiber membrane is taken out from the discharge port of the hollow fiber membrane module.
  • the flow rate of the filtrate is preferably 10 to 500 LMH as the permeation flow rate (LMH or L / [m 2 ⁇ h]) expressed by the flow rate (L) per hour per 1 m 2 of the membrane area. It is more preferably 20 LMH or more, 40 LMH or more, or 50 LMH or more and 200 LMH or less, and further preferably 40 LMH or more, 50 LMH or more, or 75 LMH or more and 150 LMH or less.
  • the backflow washing (backwashing) treatment is a washing in which water is passed from the filtered water side of the hollow fiber membrane to the raw water side.
  • the hollow fiber membrane module is an external pressure type filtration hollow fiber membrane module
  • water is passed from the inside to the outside of the hollow fiber membrane.
  • the suspended solids deposited in the pores of the thick part of the hollow fiber membrane by the backwash treatment are extruded to the raw water side of the hollow fiber membrane (in the case of the external pressure type filtered hollow fiber membrane module, the outside of the hollow fiber membrane).
  • the water passed from the filtered water side of the hollow fiber membrane to the raw water side may be, for example, filtered water.
  • the flow rate of water (preferably filtered water) during the backwash treatment is preferably 0.1 to 3 times, more preferably 0.3 to 3 times, the permeation flow rate of the permeation flow rate in the filtration step, and further. It is preferably 0.5 to 3 times, and particularly preferably 0.7 to 3 times.
  • the flushing treatment is a cleaning method in which water is passed through the raw water side of the hollow fiber membrane.
  • the hollow fiber membrane module is an external pressure type filtration hollow fiber membrane module, water is passed over the outer surface of the hollow fiber membrane.
  • the amount of water passed through the raw water side of the hollow fiber membrane in the flushing treatment is preferably 0.3 to 3 times the amount of water entering the hollow fiber membrane module, and is preferably 0.5 to 2 times. It is more preferable to double the amount.
  • the drain treatment is a step of draining the cleaning waste liquid remaining inside the hollow fiber membrane module.
  • the drain treatment can be performed, for example, by introducing compressed air from the cleaning discharge port of the hollow fiber membrane module.
  • the cleaning drainage liquid remaining inside the hollow fiber membrane module can be forcibly discharged from the lower part of the module.
  • the amount of water remaining in the hollow fiber membrane module after the drain treatment is preferably 0.7 times or less, more preferably 0.5 times the amount of water entering the hollow fiber membrane module. The amount is as follows, and more preferably 0.3 times or less.
  • the air scrubbing treatment is a cleaning method in which compressed air is introduced from the introduction port of the hollow fiber membrane module, discharged from the cleaning discharge port, and the hollow fiber membrane is shaken by air (air bubbles).
  • the amount of compressed air introduced into the hollow fiber membrane module during the air scrubbing process may be 0.001 to 0.115 to 1000 Nm 3 / h per 1 m 2 of the cross-sectional area of the hollow fiber membrane module housing. It is preferable, more preferably 75 to 500 Nm 3 / h, still more preferably 150 to 400 Nm 3 / h, particularly preferably 170 to 400 Nm 3 / h, and further preferably 200 to 350 Nm 3 / h, or 200 to 200 to. It may be 300 Nm 3 / h.
  • the turbid component accumulated on the hollow fiber membrane is removed.
  • the first washing step it is preferable that at least one of (A1) backwashing treatment, (A2) flushing treatment, and (A3) drain treatment is performed.
  • the carrying-out time is, for example, 10 to 120 seconds, preferably 15 to 60 seconds.
  • the implementation time is, for example, 10 to 120 seconds, preferably 15 to 60 seconds.
  • the (A3) drain treatment is preferably performed until the amount of water in the hollow fiber membrane module is reduced to the above-mentioned amount.
  • the removal rate of the turbidity component (SS) deposited on the hollow fiber membrane is preferably 7% by mass or more, more preferably 8% by mass or more, further preferably 10% by mass or more, and 12% by mass. As mentioned above, it may be 15% by mass or more, 18% by mass or more, or 20% by mass or more.
  • the removal rate of the turbidity component is expressed as a ratio (percentage) of the amount of SS removed by the first cleaning step to the amount of the turbidity component brought into the hollow fiber membrane module (the amount of SS brought in) in the filtration step.
  • the amount of SS brought in can be calculated from the difference between the amount of the turbid component contained in the raw water and the amount of the turbid component contained in the filtered water, and the implementation time of the filtration step.
  • the second cleaning step is a step of removing the turbidity component from the hollow fiber membrane by the first cleaning step, preferably outside the module.
  • the second cleaning step at least an air scrubbing process is performed.
  • the second cleaning step is preferably a step of performing any of the following (B1) to (B3).
  • B3 a step of simultaneously performing an air scrubbing treatment and a flushing treatment (ASFL).
  • the implementation time is, for example, 10 to 120 seconds, preferably 15 to 60 seconds.
  • the second cleaning step is (B2) a step of simultaneously performing the air scrubbing treatment and the backwashing treatment (ASBW)
  • the implementation time is, for example, 10 to 120 seconds, preferably 15 to 60 seconds.
  • the second cleaning step is (B3) a step of simultaneously performing the air scrubbing treatment and the flushing treatment (ASFL)
  • the implementation time is, for example, 10 to 120 seconds, preferably 15 to 60 seconds.
  • the third cleaning step is a step arbitrarily performed after the first cleaning step and the second cleaning step.
  • This third cleaning step is a step of discharging the turbidity component removed in the first cleaning step and the second cleaning step to the outside of the hollow fiber membrane module.
  • at least one of the following treatments (C1) and (C2) is performed: (C1) Flushing treatment in which water is passed through the raw water side of the hollow fiber membrane; and (C2) Backwashing treatment in which water is passed from the filtered water side of the hollow fiber membrane to the raw water side.
  • the amount of water passed through the raw water side of the hollow fiber membrane is 0.3 to 3 times the amount of water entering the hollow fiber membrane module.
  • the amount is preferably 0.5 to 2 times, more preferably 0.5 to 2 times.
  • the amount of water in the case of performing the (C2) backwashing treatment is preferably 0.1 to 3 times, more preferably 0.3 to 3 times, the permeation flow rate in the filtration step.
  • the implementation time is preferably 10 to 120 seconds, more preferably 15 to 60 seconds.
  • a draining step of draining the cleaning drainage remaining inside the hollow fiber membrane module may be performed, and it is preferable to do so.
  • the discharge step can be performed, for example, by introducing compressed air from the cleaning discharge port of the hollow fiber membrane module.
  • the cleaning drainage liquid remaining inside the hollow fiber membrane module can be forcibly discharged from the lower part of the module.
  • the weight of the hollow fiber membrane module is preferably 1.70 times or less, more preferably 1.60 times or less, still more preferably 1.55 times the initial dry weight of the hollow fiber membrane module. It is less than double.
  • the number of thread breaks in the hollow fiber membrane after repeating a cycle consisting of a predetermined filtration step, a cleaning step, and preferably a discharge step 20,000 times is determined inside the hollow fiber membrane module. It can be kept to 0.5% or less of the total number of hollow fiber membranes. In a preferred embodiment of the present embodiment, even if the above cycle is repeated 100,000 times or 200,000 times, the number of thread breaks in the hollow fiber membrane is 0.5% or less of the total number of hollow fiber membranes. Can be done.
  • the hollow fiber membrane module of the present embodiment is a hollow fiber membrane module after repeating a cycle consisting of a predetermined filtration step, a cleaning step, and preferably a recording / discharging step n-1 times and performing the nth filtration step.
  • the water permeation performance Ln and the water permeation performance Ln + 1 of the hollow fiber membrane module after the nth cleaning step and the n + 1th filtration step immediately after that are the following formulas: 105% ⁇ (Ln + 1 / Ln) ⁇ 100 ⁇ 80% It is preferable to satisfy the relationship of.
  • the water permeability is a value [LMH / kPa] obtained by dividing the filtration flux [LMH] by the pressure [kPa] at that time.
  • Embodiment of cleaning method of hollow fiber membrane module can preferably be performed on the above-mentioned hollow fiber membrane module incorporated in a suitable filtration system, preferably following the filtration step.
  • FIG. 2 shows a flow chart of an example of a filtration system for carrying out the method for cleaning the hollow fiber membrane module of the present invention.
  • the filtration system (1000) of FIG. 2 includes a hollow fiber membrane module (100), a stock solution tank (200), a strainer (210), a raw water tank (300), a filtered water tank (400), and a compressor (100) of the present embodiment. 500) has a configuration in which valves are connected by appropriately arranged pipes.
  • the pump for sending the liquid, the drain pipe normally installed in each tank, the chemical liquid tank for cleaning the chemical liquid and the piping associated therewith, the sensor for checking the operating condition, and the like are omitted.
  • the filtration method of the present embodiment including a predetermined filtration step and a cleaning step can be performed, for example, as follows.
  • ⁇ Filtration process (F) In the filtration step, raw water is passed through the hollow fiber membrane in the hollow fiber membrane module and filtered to obtain filtered water.
  • the undiluted solution such as suspended water and process process solution is once stored in the undiluted solution tank (200), and then the filtered water roughly filtered by the strainer (210) is used in the present embodiment. It is used as raw water in the filtration method of.
  • the raw water is stored in the raw water tank (300).
  • the raw water in the raw water tank (300) is introduced into the hollow fiber membrane module (100) from the introduction port (1) via the raw water feed valve (V1), and the thickness of the hollow fiber membrane is increased from the outside of the hollow fiber membrane.
  • the filtered water seeping into the inner space of the hollow fiber membrane is stored in the filtered water tank (400) via the filtered water port (2) and the filtered water feed valve (V2).
  • ⁇ Cleaning process In the cleaning step, the first cleaning step and the second cleaning step are performed in this order, and optionally, a third cleaning step may be performed.
  • first washing step at least one of (A1) backwashing treatment (BW), (A2) flushing treatment (FL), and (A3) drain treatment (DL) is performed.
  • second cleaning step (B1) air scrubbing treatment (AS), (B2) backwash-air scrubbing simultaneous cleaning (ASBW), or (B3) flushing-air scrubbing simultaneous cleaning (ASFL) is performed.
  • ASBW air scrubbing treatment
  • ASBW air scrubbing treatment
  • ASBW backwash-air scrubbing simultaneous cleaning
  • C1 flushing treatment (FL) and (C2) backwashing treatment (BW) is performed.
  • BW Backwash
  • the filtered water in the filtered water tank (400) is introduced into the hollow fiber membrane module (100) from the filtered water port (2) via the backwash valve (V3), and the hollow fiber is introduced from the inside of the hollow fiber membrane. It passes through the thick portion of the membrane and seeps into the outer space of the hollow fiber membrane. In this process, the suspended solids deposited in the pores of the thick portion of the hollow fiber membrane are pushed out of the hollow fiber membrane to clean the hollow fiber membrane.
  • the filtered water seeping into the outer space of the hollow fiber membrane can be discharged by any of the following methods: A method of discharging to the outside of the system via the cleaning discharge port (3) and the cleaning discharge valve (V5); A method of discharging to the outside of the system via the introduction port (1) and the cleaning drain valve (V4); and discharging to the outside of the system via the cleaning discharge port (3) and the cleaning discharge valve (V5). , A method of discharging to the outside of the system via the introduction port (1) and the cleaning drain valve (V4).
  • FL ⁇ Flushing processing
  • raw water is passed through the outside of the hollow fiber membrane, and suspended solids adhering to the outer surface of the hollow fiber membrane are washed away and washed.
  • the raw water in the raw water tank (300) is introduced into the hollow fiber membrane module (100) from the introduction port (1) via the raw water feed valve (V1), and then passes through the outer space of the hollow fiber membrane. Then, it is discharged to the outside of the system via the cleaning discharge port (3) and the cleaning drainage discharge valve (V5).
  • DL Drain processing
  • the compressed air introduced from the cleaning discharge port (3) of the hollow fiber membrane module (100) is introduced together with the cleaning drainage remaining inside the hollow fiber membrane module via the compressed air valve (V7) for drain treatment.
  • AS Air scrubbing process
  • compressed air is introduced from an introduction port and discharged from a cleaning discharge port, and the hollow fiber membrane is shaken by air (air bubbles) passing outside the hollow fiber membrane.
  • the air compressed by the compressor (500) is introduced into the hollow fiber membrane module (100) from the introduction port (1) via the valve (V6) for AS, and passes through the outer space of the hollow fiber membrane. , It is discharged to the outside of the system through the cleaning discharge port (3) and the cleaning drainage discharge valve (V5).
  • ASBW ⁇ Backwash-Simultaneous air scrubbing wash
  • ASFL ⁇ Simultaneous flushing-air scrubbing cleaning
  • the above-mentioned FL and AS are performed at the same time. That is, the liquid to be treated in the raw water tank (300) is introduced into the hollow fiber membrane module (100) from the introduction port (1) via the raw water supply valve (V1), and then the cleaning discharge port (3). And, while being discharged to the outside of the system via the cleaning drainage discharge valve (V5), the compressed air from the compressor (500) is discharged from the introduction port (1) via the AS valve (V6) to the hollow fiber membrane module (1). It is introduced into 100) and discharged to the outside of the system via the cleaning discharge port (3) and the cleaning drainage discharge valve (V5).
  • a discharge step of discharging the cleaning drainage liquid remaining inside the hollow fiber membrane module may be performed.
  • the compressed air introduced from the cleaning discharge port (3) of the hollow fiber membrane module (100) is introduced through the compressed air valve (V7) for the discharge process. This can be done by discharging the cleaning drainage remaining inside the hollow fiber membrane module to the outside of the system via the introduction port (1) and the cleaning drainage drain valve (V4).
  • ⁇ Hollow fiber membrane module ⁇ when the filtration operation using the porous hollow fiber membrane involves a cleaning step, the cleaning efficiency is excellent, the deterioration of the filtration performance with time is suppressed, and the hollow fiber membrane and the hollow fiber membrane thereof are used.
  • a hollow fiber membrane module is provided that does not impair the life of the including module.
  • Such a hollow fiber membrane module A bundle of hollow fiber membranes consisting of multiple hollow fiber membranes, The housing in which the hollow fiber membrane bundle is housed and A hollow fiber membrane module provided with an adhesive fixing portion for adhesively fixing both ends of the hollow fiber membrane bundle and the housing.
  • the hollow fiber membrane is a microfiltration (MF) membrane or an ultrafiltration (UF) membrane.
  • the adhesive fixing portion is At one end of the hollow fiber membrane, a first adhesive fixing layer for adhering and fixing the hollow fiber membranes, the hollow fiber membrane bundle, and the inner wall of the housing with a resin material.
  • a second adhesive fixing layer for adhesively fixing the hollow fiber membranes to each other, the hollow fiber membrane bundle, and the inner wall of the housing with a resin material is provided.
  • the hollow fiber membrane module is An inlet that communicates the outside of the hollow fiber membrane module with the space outside the hollow fiber membrane. It is provided with a filtration water port that communicates the outside of the hollow fiber membrane module with the space inside the hollow fiber membrane, and a cleaning discharge port that communicates the outside of the hollow fiber membrane module with the space outside the hollow fiber membrane.
  • the filling rate of the hollow fiber membrane which is expressed as a ratio of the total cross-sectional area of the hollow fiber membrane to the internal cross-sectional area of the housing, is 38% or less;
  • the outer diameter of the hollow fiber membrane is 1.1 mm or less; and
  • the total membrane area of the hollow fiber membrane is 70 m 2 or more; It is a hollow fiber membrane module that satisfies all of the above.
  • the effective length of the hollow fiber membrane in this hollow fiber membrane module is preferably 1.6 m or more. It is preferable that the adhesive fixing portion of the hollow fiber membrane module does not have a regulating member for regulating the arrangement of the hollow fiber membrane. Further, it is preferable that the hollow portion of the hollow fiber membrane is open in the first adhesive fixing layer, and the hollow portion of the hollow fiber membrane is sealed in the second adhesive fixing layer. Further, it is preferable that the second adhesive fixing layer has a hole penetrating the second adhesive fixing layer. Regarding the other aspects of the hollow fiber membrane module described above, the above description can be incorporated as a description of the hollow fiber membrane module to which the cleaning method of the present invention is applied.
  • a filtration method performed by using the above-mentioned hollow fiber membrane module.
  • This filtration method A filtration method for filtering raw water using the above hollow fiber membrane module.
  • the filtration method is A filtration step of passing raw water through the hollow fiber membrane to obtain filtered water by external pressure filtration; and a cleaning step performed after the filtration step.
  • the cleaning step is The first cleaning step of backflow cleaning or flushing and the second cleaning step are included in this order.
  • the second cleaning step is Backflow cleaning that allows the filtered water to pass from the inside to the outside of the hollow fiber membrane, or flushing that introduces raw water from the introduction port and discharges it from the cleaning discharge port.
  • Raw water containing air bubbles is introduced from the introduction port, discharged from the cleaning discharge port, and the hollow fiber membrane is shaken by the air bubbles, which is combined with air scrubbing to clean the outer surface of the hollow fiber membrane.
  • Backflow cleaning-simultaneous air scrubbing cleaning, or flushing-simultaneous air scrubbing cleaning It is a filtration method. In this filtration method, it is not necessary to perform the first cleaning step in the cleaning step, and a high cleaning effect can be obtained without performing the first cleaning step.
  • a third cleaning step may be further included after the first cleaning step and the second cleaning step.
  • This third cleaning step may be a step of performing at least one of the following treatments (C1) and (C2): (C1) Flushing treatment in which water is passed through the raw water side of the hollow fiber membrane; and (C2) Backflow cleaning treatment in which water is passed from the filtered water side of the hollow fiber membrane to the raw water side.
  • a discharge step of discharging the cleaning drainage on the outside of the hollow fiber membrane and the hollow portion from the introduction port or the cleaning discharge port after the cleaning step is preferably a step of introducing compressed air into the introduction port or the cleaning discharge port and forcibly discharging the cleaning drainage liquid.
  • the average turbidity of the raw water filtered by the hollow fiber membrane module is preferably 10 degrees or higher because the performance of the hollow fiber membrane module can be suitably exhibited.
  • a hollow fiber-shaped filtration membrane manufactured by Asahi Kasei Co., Ltd. (ultrafiltration membrane, made of polyvinylidene fluoride (PVDF), outer diameter 1.2 mm, inner diameter 0.7 mm, length 2 m, membrane)
  • External pressure type hollow fiber membrane module (total membrane area 50 m) manufactured by bundling 6,600 pieces (average pore diameter 0.08 ⁇ m) and storing them in an ABS casing (length 2 m, diameter 6 inches, cylindrical shape). 2 ) was used.
  • Test method As raw water, river surface water containing suspended solids (SS) as a turbid component was used. The SS amount of this river surface water was 0.024 g / L, and the TOC (total organic carbon amount) was 0.003 g / L.
  • a filtration operation was performed for 30 minutes using a constant flow rate external pressure total filtration method in which raw water did not flow to the discharged water side.
  • the predetermined washing of each Example or Comparative Example was performed. The cycle consisting of the above 30-minute filtration operation and the predetermined washing was repeated, and the operation was performed for 12 months.
  • the amount of SS removed by the first cleaning step at the time of the first cleaning after the start of operation was measured, and the removal rate (mass%) with respect to the brought-in SS amount.
  • Example A1 >> In Example A1, As the first cleaning step, backflow cleaning treatment with filtered water is performed. Next, as a second cleaning step, a backflow cleaning treatment with filtered water and an air scrubbing treatment with air are performed at the same time. Then, as a third washing step, washing was performed by a method of performing a flushing treatment with raw water.
  • the cleaning conditions for each step are as follows.
  • Backflow cleaning treatment Treatment of passing filtered water from the filtered water side to the raw water side at a flow rate of 2,000 L / hr First cleaning step Implementation time: 30 seconds ⁇ Second cleaning step>
  • Backflow cleaning process Process of passing filtered water from the filtered water side to the raw water side at a flow rate of 2.000 L / hr
  • Air scrubbing Process of passing air through the raw water side at a flow rate of 5 Nm 3 / hr Second cleaning process implementation Time: 1 minute ⁇ Third cleaning step>
  • Flushing treatment Treatment of passing raw water to the raw water side at a flow rate of 3 m 3 / hr
  • Third cleaning step Implementation time 1 minute In the first cleaning step of Example A1, it was present in the hollow fiber membrane module before cleaning. Of the water, 50% by volume of the capacity (holdup amount) of the module was replaced with filtered water.
  • Example A2 In Example A2, as the first washing step, flushing with raw water was performed, and then the washing was performed by the method of performing the second washing step and the third washing step under the same conditions as in Example A1.
  • the cleaning conditions of the first cleaning step are as follows. ⁇ First cleaning process> Flushing treatment: Treatment of passing raw water to the raw water side at a flow rate of 3,000 L / hr First cleaning step Implementation time: 30 seconds In the first cleaning step of Example A2, it was present in the hollow fiber membrane module before cleaning. Of the water, 70% by volume of the capacity (holdup amount) of the module was replaced with raw water.
  • Example A3 As the first cleaning step, a drain treatment with air was performed for 30 seconds, and then cleaning was performed by a method of performing a second cleaning step and a third cleaning step under the same conditions as in Example A1.
  • the cleaning conditions of the first cleaning step are as follows. ⁇ Muddy substance removal process> Drain treatment: A treatment to discharge 50% by volume of the capacity (hold-up amount) of the water in the hollow fiber membrane module.
  • Example A4 a backflow cleaning treatment with filtered water is performed as a first cleaning step, then an air scrubbing treatment with air is performed as a second cleaning step, and then a third cleaning treatment is performed under the same conditions as in Example A1. Washed by the method of performing the process.
  • the cleaning conditions of the first cleaning step and the second cleaning step are as follows.
  • Example A5 >> In Example A5, backflow cleaning with filtered water is performed as the first cleaning step, and then flushing treatment with raw water and air scrubbing treatment with air are simultaneously performed as the second cleaning step, and then the same conditions as in Example A1 are performed. In, washing was performed by the method of performing the third washing step.
  • the cleaning conditions of the first cleaning step and the second cleaning step are as follows.
  • Comparative Example A1 In Comparative Example A1, cleaning was performed in the same manner as in Example A2, except that the conditions of the first cleaning step and the second cleaning step were changed as follows.
  • the cleaning conditions of the first cleaning step and the second cleaning step are as follows.
  • Backflow cleaning process Process of passing filtered water from the filtered water side to the raw water side at a flow rate of 2,000 L / hr
  • Air scrubbing Process of passing air through the raw water side at a flow rate of 5 Nm 3 / hr Second cleaning process implementation Time: 1 minute
  • 30% by volume of the capacity (hold-up amount) of the water existing in the hollow fiber membrane module before washing was replaced with raw water.
  • Comparative Example A2 ⁇ Comparative Example A2 >> In Comparative Example A2, cleaning was performed in the same manner as in Example A2, except that the conditions of the first cleaning step and the second cleaning step were changed as follows.
  • the cleaning conditions of the first cleaning step and the second cleaning step are as follows.
  • Backflow cleaning process Process of passing filtered water from the filtered water side to the raw water side at a flow rate of 2,000 L / hr
  • Air scrubbing process Process of passing air through the raw water side at a flow rate of 5 Nm 3 / hr Second cleaning process Implementation time: 1 minute
  • 40% by volume of the capacity (hold-up amount) of the water existing in the hollow fiber membrane module before washing was replaced with raw water. ..
  • Comparative Example A3 Without performing the first cleaning step As the second cleaning step, air scrubbing treatment with air is performed. Then, as a third washing step, washing was performed by a method of performing a flushing treatment with raw water.
  • the cleaning conditions for each step are as follows. ⁇ Second cleaning process> Air scrubbing treatment: Treatment to pass air to the raw water side at a flow rate of 5 Nm 3 / hr Second cleaning step Implementation time: 1 minute ⁇ Third cleaning step> Flushing treatment: Treatment to pass raw water to the raw water side at a flow rate of 3 m 3 / hr 3rd washing process Implementation time: 1 minute
  • Comparative Example A4 ⁇ Comparative Example A4 >> In Comparative Example A4, cleaning was performed by a method in which only the second cleaning step and the third cleaning step were performed under the same conditions as in Example A1 without performing the first cleaning step.
  • Comparative Example A5 ⁇ Comparative Example A5 >> In Comparative Example A5, cleaning was performed by a method in which only the second cleaning step and the third cleaning step were performed under the same conditions as in Example A5 without performing the first cleaning step.
  • Comparative Example A6 >> In Comparative Example A6, only the first cleaning step and the third cleaning step were performed under the following conditions, and cleaning was performed by a method in which the second cleaning step was not performed.
  • the cleaning conditions of the first cleaning step and the third cleaning step are as follows.
  • Flushing treatment Treatment of passing raw water to the raw water side at a flow rate of 3 Nm 3 / hr
  • Third cleaning step Implementation time 1 minute
  • the backflow cleaning treatment of this first cleaning step it exists in the hollow fiber membrane module before cleaning. 70% by volume of the capacity (hold-up amount) of the module was replaced with filtered water.
  • the second cleaning step prescribed in the present invention is not performed.
  • Comparative Example A7 >> In Comparative Example A7, only the first cleaning step was performed under the following conditions, and cleaning was performed by a method in which the second cleaning step and the third cleaning step were not performed.
  • the cleaning conditions of the first cleaning step are as follows. ⁇ First cleaning process> Flushing treatment: A treatment in which raw water is passed to the raw water side at a flow rate of 1.2 m 3 / hr. Of the water present in the module, 80% by volume of the capacity (hold-up amount) of the module was replaced with raw water. However, it should be noted that in this Comparative Example A7, the second cleaning step prescribed in the present invention is not performed.
  • turbidity discharge test it was investigated how much the total amount of turbidity components (turbidity in raw water x amount of filtrate) brought into the hollow fiber membrane module in the filtration step was discharged in the washing step.
  • the operation sequence is F (28.5 minutes) -ASBW (1 minute) -FL (0.5 minutes)
  • the turbidity of the raw water is 10 NTU
  • the amount of filtered liquid is 10 m 3 / hr
  • the amount of backwash is 10 m.
  • the recovery rate is an index showing what percentage of the filtered FLUX (permeation flow velocity) set in one cycle can be secured as filtered water by subtracting the amount of filtered water consumed in the washing step from the amount of filtered water obtained in the filtering step.
  • one cycle of the operation sequence was F (28.5 minutes) -ASBW (1 minute) -FL (0.5 minutes)
  • the filtration FLUX was 10 m 3 / hr
  • the backwash amount was 8 m 3 / hr.
  • Example B1 Reference example
  • 16,500 PVDF (polyvinylidene fluoride) hollow fiber membranes manufactured by Asahi Kasei Corporation
  • the film was attached to the circumference of the membrane bundle with a mending tape so that the circumference was 170 mm over the entire circumference.
  • 300 g of urethane resin was measured with a mixing and discharging machine, immersed in the lower surface of the membrane bundle for 30 seconds, and immediately separated.
  • the first tubular member (pipe inner diameter 200 mm) for accommodating the hollow fiber membrane bundle and the second tubular member (pipe inner diameter 218 mm) in which a rectifying cylinder having an inner diameter of 216 mm is mounted inside the membrane bundle thus formed. was inserted into the housing.
  • the hollow fiber membrane used here has an average pore diameter of 0.1 ⁇ m, an inner diameter of 0.6 mm, and an outer diameter of 0.95 mm.
  • the potting material is injected into the first tubular member and the second tubular member of the housing while rotating the container for forming the adhesive fixing portion to which the potting material introduction tube is attached, fixed to both ends of the housing.
  • a two-component thermosetting urethane resin (SA-6330A2 / SA-6330B5 (trade name) manufactured by Sanyulek Co., Ltd.) was used.
  • the end of the membrane bundle on the second tubular member side of the housing was cut to open the hollow portion of the hollow fiber membrane on the sealed side at the stage before bonding.
  • the columnar member was removed from the first adhesive fixing portion on the first tubular member side to form a plurality of through holes.
  • the effective film length of this hollow fiber membrane module is 2.0 m.
  • the filling rate of the manufactured hollow fiber membrane module was 37.2%.
  • the D hardness of the adhesively fixed portion on the end face of the manufactured hollow fiber membrane module was 55D as measured in accordance with JIS K7215.
  • the load holding time was 10 seconds
  • the hardness value was an average value of 5 points randomly selected from the adhesive fixing portion on the end face.
  • the hollow fiber membrane module obtained above is attached to the filtration system shown in FIG. 2 with the hollow fiber membrane open side facing up, and a turbidity discharge test and a scratch durability test are performed. gone.
  • the turbidity discharge property was examined by the operation with the following settings. Operation sequence: F (28.5 minutes) -ASBW (1 minute) -FL (0.5 minutes) are set in this order.
  • Raw water turbidity 10 NTU Filtration
  • FLUX 100LMH Backwash
  • FLUX 80LMH FL flow rate: 3m 3 / hr
  • the average turbidity of the discharged water at the time of ASBW was 250 NTU
  • the average turbidity of the discharged water at the time of FL was 180 NTU.
  • the mass ratio (turbidity exclusion rate) of the excluded turbidity among the turbidity brought into the module was 80% by mass.
  • the "footprint” in Table 2 is the "SS removal rate", which measures the amount of SS removed by the first cleaning step during the first cleaning after the start of operation, and the removal rate (mass) with respect to the amount of SS brought in. %) Is a value indicating.
  • the "recovery rate” is a value indicating the ratio of the amount of liquid secured as filtered water in the filtered FLUX in units of mass%.
  • Examples B2 to B8 and Comparative Examples B1 to B7 A membrane module was prepared in the same manner as in Example B1 except that the specifications and test conditions of the membrane module were as shown in Table 2, and a turbidity discharge test and a scratch durability test were performed. .. In addition, Examples B2 and B3 are reference examples. The results are summarized in Table 2.
  • the raw water used was diluted sand filtration backwash wastewater from a water purification plant and adjusted to the turbidity shown in Table 2.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
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  • Separation Using Semi-Permeable Membranes (AREA)
PCT/JP2021/043885 2020-11-30 2021-11-30 中空糸膜モジュールの洗浄方法 Ceased WO2022114222A1 (ja)

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CN202180080557.9A CN116568384A (zh) 2020-11-30 2021-11-30 中空纤维膜组件的清洗方法
CN202310894396.8A CN117298867A (zh) 2020-11-30 2021-11-30 中空纤维膜组件的清洗方法
US18/143,803 US20230271140A1 (en) 2020-11-30 2023-05-05 Method for washing hollow fiber membrane module

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JP2006231264A (ja) * 2005-02-28 2006-09-07 Aqua Systems:Kk 膜ろ過モジュールの洗浄方法
JP3948593B2 (ja) * 1999-09-10 2007-07-25 旭化成ケミカルズ株式会社 膜の洗浄方法
JP2007289940A (ja) * 2006-03-29 2007-11-08 Toray Ind Inc 中空糸膜モジュールの洗浄方法
JP2011056340A (ja) * 2009-09-07 2011-03-24 Toshiba Corp 膜ろ過システム
JP2015083309A (ja) * 2013-08-21 2015-04-30 アタカ大機株式会社 自己洗浄槽保有型膜ろ過装置
WO2017115769A1 (ja) * 2015-12-28 2017-07-06 東レ株式会社 中空糸膜モジュールおよびその運転方法

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US6322703B1 (en) * 1999-04-20 2001-11-27 Asahi Kasei Kabushiki Kaisha Method for purifying aqueous suspension
JP6616593B2 (ja) * 2015-06-10 2019-12-04 オルガノ株式会社 膜の洗浄方法
JP6731308B2 (ja) * 2016-08-04 2020-07-29 オルガノ株式会社 有価物回収方法及び有価物回収装置

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Publication number Priority date Publication date Assignee Title
JP3948593B2 (ja) * 1999-09-10 2007-07-25 旭化成ケミカルズ株式会社 膜の洗浄方法
JP2006231264A (ja) * 2005-02-28 2006-09-07 Aqua Systems:Kk 膜ろ過モジュールの洗浄方法
JP2007289940A (ja) * 2006-03-29 2007-11-08 Toray Ind Inc 中空糸膜モジュールの洗浄方法
JP2011056340A (ja) * 2009-09-07 2011-03-24 Toshiba Corp 膜ろ過システム
JP2015083309A (ja) * 2013-08-21 2015-04-30 アタカ大機株式会社 自己洗浄槽保有型膜ろ過装置
WO2017115769A1 (ja) * 2015-12-28 2017-07-06 東レ株式会社 中空糸膜モジュールおよびその運転方法

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