WO2019216147A1 - Module de membrane à fibres creuses de type à pression externe - Google Patents

Module de membrane à fibres creuses de type à pression externe Download PDF

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Publication number
WO2019216147A1
WO2019216147A1 PCT/JP2019/016557 JP2019016557W WO2019216147A1 WO 2019216147 A1 WO2019216147 A1 WO 2019216147A1 JP 2019016557 W JP2019016557 W JP 2019016557W WO 2019216147 A1 WO2019216147 A1 WO 2019216147A1
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WO
WIPO (PCT)
Prior art keywords
fiber membrane
hollow fiber
case housing
cylindrical case
cap
Prior art date
Application number
PCT/JP2019/016557
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English (en)
Japanese (ja)
Inventor
勝美 細野
茂之 池永
Original Assignee
ダイセン・メンブレン・システムズ株式会社
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
Priority claimed from JP2019071027A external-priority patent/JP7175578B2/ja
Application filed by ダイセン・メンブレン・システムズ株式会社 filed Critical ダイセン・メンブレン・システムズ株式会社
Publication of WO2019216147A1 publication Critical patent/WO2019216147A1/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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/06—Organic material
    • B01D71/08—Polysaccharides
    • B01D71/12—Cellulose derivatives
    • B01D71/14—Esters of organic acids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/06—Organic material
    • B01D71/08—Polysaccharides
    • B01D71/12—Cellulose derivatives
    • B01D71/14—Esters of organic acids
    • B01D71/16—Cellulose acetate
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D01F2/24—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from cellulose derivatives
    • D01F2/28—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from cellulose derivatives from organic cellulose esters or ethers, e.g. cellulose acetate

Definitions

  • the present invention relates to an external pressure type hollow fiber membrane module used in various water treatment fields.
  • Hollow fiber membrane modules are widely used in various water treatment fields. Generally, a casing having a fluid inlet / outlet, a cap, a hollow fiber membrane bundle, and a resin-sealed resin-fixed end portion of the hollow fiber membrane bundle. Many of them are composed of parts (FIG. 1 of US Patent Publication No. 2003/0150807).
  • the filtration performance deteriorates due to clogging of the membrane or the formation of an adhesion layer on the membrane surface. Fouling may occur. When such fouling occurs, the filtration performance is recovered by washing the membrane by air scrubbing washing or back pressure washing.
  • Japanese Patent No. 6264508 discloses a cylindrical case having a first end and a second end in the height direction, a plurality of hollow fiber membranes accommodated in the cylindrical case, and the first of the cylindrical case.
  • a first potting part that is bonded in a state where the ends of a plurality of hollow fiber membranes located on one end side are opened, and the hollow fiber membrane has a breaking strength of 23 MPa or more, and the filling rate of the hollow fiber membranes Discloses a hollow fiber membrane module having a ratio of 40% to 80%.
  • FIG. 1 of Japanese Patent No. 4882173 a hollow fiber membrane bundle 3 is accommodated in a case 1, and one end A of the hollow fiber membrane bundle 3 is resin so that the end of the hollow fiber membrane 2 is open.
  • the hollow fiber membrane module 50 is bonded and fixed at 20 and bonded to the inner wall of the case, and the other end B is bonded and fixed with a resin 20 so that the end of the hollow fiber membrane 2 is sealed and bonded to the inner wall of the case.
  • the raw water supply port 5 corresponding to the end B and the air discharge port 6 corresponding to the end A are formed on the side surface of the filtration zone 4 sandwiched between the ends A and B.
  • a hollow fiber membrane module in which an air dispersion hole / drainage hole 11 penetrating the end B is provided in the end B.
  • a hollow fiber membrane bundle is disposed around a water collection tube disposed in the center of a cylindrical case, and the water collection tube and the hollow fiber membrane bundle are used for sealing.
  • the water collecting tube and the hollow fiber membrane bundle integrated with the sealing resin are fixed in a state where the end surface of the water collecting tube is retracted inward from the end surface of the hollow fiber membrane bundle.
  • the inner peripheral wall in the vicinity of the opening of the water collecting pipe has an internal structure (for example, a thread for screwing and a step for fitting) that can be connected to other members, for example, a pipe. It is described that a cap having a liquid inlet / outlet port can be put on both ends as in the known hollow fiber membrane module as shown in FIG. 1 of Japanese Patent Application Publication No. 2003/0150807 (paragraph numbers 0014 and 0015).
  • Japanese Patent Application Laid-Open No. 2014-226607 describes a hollow fiber membrane module in which a reinforcing function for a cap placed on the end of a cylindrical case housing is enhanced.
  • An object of the present invention is to provide an external pressure type hollow fiber membrane module in which fouling is unlikely to occur in a hollow fiber membrane during filtration operation and the hollow fiber membrane has good cleanability.
  • a water collecting pipe and a hollow fiber membrane bundle comprising a porous cylindrical body are provided in a cylindrical case housing having a first end portion having a raw water inlet and a second end portion opposite to the first end portion in the axial direction.
  • the hollow fiber membrane bundle is disposed around the water collection pipe, and at least the hollow fiber membrane bundle on the second end side is integrated with the cylindrical case housing and the water collection pipe with a sealing resin,
  • the first end of the cylindrical case housing is closed with a first cap having a raw water inlet
  • the second end of the cylindrical case housing is closed with a second cap having a first liquid outlet and a second liquid outlet.
  • a hollow fiber membrane module The first cap side and the second cap side of the water collecting pipe are opened, The end portion on the first cap side of the hollow fiber membrane bundle is closed, the end portion on the second cap side is opened, and both end sides face the inside of the first cap or the inside of the second cap,
  • the filling rate of the hollow fiber membrane bundle is 40% to 70%
  • a sediment layer derived from suspended solids is hardly formed on the surface of the hollow fiber membrane, and clogging is less likely to occur, so that fouling is less likely to occur.
  • formula hollow fiber membrane module (it has an inner raw
  • the fragmentary sectional view by the side of the 2nd cap of FIG. The fragmentary sectional view of the water collection pipe used with the hollow fiber membrane module of the present invention.
  • (A) is a fragmentary sectional view of the water collection pipe of Drawing 3
  • (b) is a partial sectional view of the water collection pipe of other embodiments.
  • (A) is a front view of the inlet connection pipe of FIG. 5, and (b) is a radial cross-sectional view of a portion passing through the water passage hole of the inlet connection pipe.
  • FIG. 2 is a cross-sectional view in the axial direction (longitudinal direction) of an external pressure type hollow fiber membrane module having an outside raw water introduction hole instead of an inside raw water introduction hole in the external pressure type hollow fiber membrane module of FIG. 1. It is radial direction sectional drawing of FIG. 7, and sectional drawing for demonstrating an outside raw
  • a hollow fiber membrane module 10 includes a water collecting tube 12 and a hollow fiber membrane bundle 13 formed of a porous cylindrical body in a cylindrical case housing 11. Is housed. Further, the case housing 11 has a first end portion 11a having a raw water inlet 41, a second end portion 11b opposite to the first end portion 11a in the axial direction, and the first end portion 11a side has a raw water inlet 41. Closed by a first cap 40, the second end 11b side of the cylindrical case housing is closed by a second cap 50 having a first liquid outlet (filtrated water outlet) 51 and a second liquid outlet (concentrated water outlet) 52. Yes.
  • a header 15 a or 15 b is attached to the first end portion 11 a and the second end portion 11 b of the case housing 11.
  • the first cap 40 or the second cap 50 is put on the header 15a or 15b, and these connections are made by a method such as screwing, bonding with an adhesive, or welding according to the respective materials. Can be applied.
  • the case housing 11, the water collecting pipe 12, the header 15a, the header 15b, the first cap 40, and the second cap 50 are made of resin or metal such as polyvinyl chloride, ABS resin, acrylic resin, polycarbonate, polyethylene, or polypropylene. Can be used.
  • resin or metal such as polyvinyl chloride, ABS resin, acrylic resin, polycarbonate, polyethylene, or polypropylene.
  • synthetic resin for the purpose of increasing the strength of the case housing 11, the water collecting pipe 12, the header 15a, the header 15b, the first cap 40, and the second cap 50 or blocking light, A pigment or the like can be contained.
  • a hollow fiber membrane bundle 13 is disposed around the water collecting pipe 12, and at least the hollow fiber membrane bundle 13 on the second end portion 11b side is sealed with a resin for sealing at the resin sealing portion 35b.
  • 11 and the water collecting pipe 12 and preferably, the first end portion 13a side and the second end portion 13b side of the hollow fiber membrane bundle 13 are sealed with a resin sealing portion 35a or 35b, respectively.
  • the case housing 11 and the water collecting pipe 12 are integrated. Further, in the hollow fiber membrane bundle 13, the end portion 13a on the first cap 40 side of the hollow fiber membrane bundle 13 is closed, the end portion 13b on the second cap 50 side is opened, and both end portions are inside the first cap 40 or on the first cap side. 2 faces the inside of the cap 50.
  • the hollow fiber membrane bundle 13 is a bundle of hundreds to thousands of known hollow fiber membranes.
  • the hollow fiber membrane is preferably a hydrophilic membrane (cellulose membrane such as cellulose acetate) or a hydrophobic membrane (polyvinylidene fluoride, polysulfone, polyether) having an outer diameter of preferably 1 to 3 mm, more preferably 1.3 to 1.6 mm. Sulfone etc.) can be used.
  • the hollow fiber membrane is preferably a cellulose ester membrane from the viewpoint of water permeability and hydrophilicity.
  • cellulose ester film one or more selected from cellulose acetate, cellulose propionate, cellulose butyrate, and cellulose benzoate can be used.
  • the length from the first end portion 13a side to the second end portion 13b side of the hollow fiber membrane bundle 13 is preferably 2 m or less, more preferably 1.5 m or less, And preferably it is 0.8 m or more, More preferably, it is 1.0 m or more.
  • the filling rate of the hollow fiber membrane bundle 13 is 40% to 70%, preferably 45% to 65%, more preferably 50% to 60% from the viewpoint of preventing fouling of the hollow fiber membrane. .
  • the filling rate of the hollow fiber membrane bundle 13 is 40% or more, the shear force of water is increased on the surface of the hollow fiber membrane, and sludge is difficult to adhere. In particular, sludge hardly adheres to the surface of the hollow fiber membrane in the vicinity of the catchment basin.
  • the filling rate of the hollow fiber membrane bundle 13 is calculated from the product of the average cross-sectional area in the axial direction per hollow fiber membrane and the number of hollow fiber membranes accommodated in the case housing 11.
  • the cross-sectional area of the film bundle is S2
  • the minimum cross-sectional area in the axial direction of the inner peripheral portion of the case housing 11 is S1
  • the following calculation is performed.
  • Filling rate [%] S2 / S1 ⁇ 100
  • the minimum cross-sectional area S1 is a cross-sectional area of the axially smallest portion of the inner peripheral portion of the case housing 11, and a hollow fiber membrane excluding members other than the hollow fiber membrane bundle such as the water collecting pipe 12 is used. It shall mean the sectional area of the space.
  • the average cross-sectional area in the axial direction per hollow fiber membrane is obtained by arbitrarily collecting a total of 100 hollow fiber membranes from a bundle of hollow fiber membranes accommodated in the case housing 11, and each hollow fiber membrane The outer diameter of the film is measured to calculate the cross-sectional area, and the average of these values is used.
  • the first cap of the hollow fiber membrane bundle 13 is used.
  • the portion facing the inside 40 may have a plurality of inner raw water introduction holes 14 formed through the sealing resin 35a in the thickness direction.
  • the plurality of inner raw water introduction holes 14 are formed so as to penetrate the sealing resin layer 35a, and inside the hollow fiber membrane bundle 13 where the leading ends of the introduction holes are not fixed with the sealing resin. However, it does not reach the sealing resin layer 35b.
  • the opening area of the inner raw water introduction hole 14 is not particularly limited, but is preferably in the range of 1 to 15% with respect to the cross-sectional area in the radial direction of the hollow fiber membrane bundle 13.
  • the first end portion 13a side and the second end portion 13b side of the hollow fiber membrane bundle 13 are sealed with resin for sealing at the resin sealing portion 35a or 35b together with the cylindrical member 30 disposed between the hollow fiber membrane bundles 13. It may be integrated.
  • the outer peripheral surface 31a of the peripheral wall portion 31 of the cylindrical member 30 and the hollow fiber membrane bundle 13 are fixed with a sealing resin, and the water collecting pipe 12 is not in contact with the resin.
  • the cylindrical member 30 has a cylindrical groove portion 33 formed between the lower outer peripheral wall portion 32 a and the lower inner peripheral wall portion 32 b below the peripheral wall portion 31.
  • An annular step surface 31 c is formed inside the cylindrical member 30 at a position facing the cylindrical groove portion 33 in the axial direction.
  • the cylindrical member 30 and the water collecting pipe 12 are fixed in a state where the end of the water collecting pipe 12 is fitted in the cylindrical groove portion 33 of the cylindrical member 30.
  • the cylindrical member 30 can be made transparent so that the resin sealing portion 35a or 35b on the opposite side can be easily seen with the naked eye.
  • the cylindrical member 30 is made transparent, it is preferably made of resin such as PET resin, polystyrene resin, polyamide resin, acrylic resin, ABS resin, polycarbonate resin.
  • urea resin adhesive As a sealing resin used for forming the resin sealing portion 35a or 35b, urea resin adhesive, melamine resin adhesive, phenol resin adhesive, resorcinol resin adhesive, epoxy resin adhesive, polyurethane adhesive, vinyl A urethane adhesive can be mentioned, and among these, a polyurethane adhesive is preferable.
  • the water collecting pipe 12 is a porous cylindrical body having a porous surface, and the water collecting pipe 12 is opened on both the first cap 40 side and the second cap 50 side.
  • the water collecting pipe 12 can be a known pipe or a corrugated pipe.
  • the water collecting pipe (corrugated pipe) 12 is widely used in various fields. As shown in FIGS. 3 and 4, the water collecting pipe (corrugated pipe) 12 is continuously formed in the circumferential direction with the concave portion 21 continuously formed in the circumferential direction.
  • the convex portions 22 are alternately formed in the axial direction.
  • the water collecting pipe (corrugated pipe) 12 has a water passage hole 25 in the concave portion 21 on the peripheral surface.
  • the water passage hole 25 is formed only in the concave portion 21 and is not formed in the convex portion 22.
  • Two to twelve water passage holes 21 are preferably formed at equal intervals in one recess 21, more preferably four to ten, and more preferably six to eight. preferable. For example, if ten recesses 21 are formed in one recess 21 and the recesses 21 are 100 as a whole, a total of 1000 channels 25 are formed. In the case of a water collecting pipe having a smooth surface, if too many water holes are formed, the strength of the water collecting pipe itself is lowered and cannot be used practically. However, when a corrugated pipe is used as the water collecting pipe 12, the convex portion 22 is used for reinforcement. Since it acts as a rib, more water holes can be formed as compared with a water collection pipe having a smooth surface.
  • the opening diameter of the water passage hole 25 can be adjusted by the size of the water collecting pipe 12, but is preferably 2 to 10 mm, more preferably 3 to 8 mm, and further preferably 4 to 5 mm.
  • the diameter of the opening is an inner diameter
  • the water passage hole 25 is not circular, it is an inner diameter when converted to a circle having the same area.
  • more water passage holes 25 can be formed as compared with a water collection pipe having a smooth surface, so that the total opening area of the whole water passage hole 25 remains large ( Alternatively, the diameter of the opening can be reduced while maintaining the same level as before.
  • the water pressure when raw water flows out from the water collecting pipe 12 to the water passage hole 25 can be reduced by reducing the diameter of the opening portion of the water passage hole 25, the hollow fiber located at a position close to the water passage hole 25. This is preferable because the influence on the film 13 can be reduced.
  • the total opening area of the water passage holes 25 is preferably at least 3 times the radial cross-sectional area of the water collecting pipe 12, and more preferably 3 to 6 times.
  • the radial direction cross-sectional area of the water collecting pipe 12 is a cross-sectional area between the recesses facing directly in the radial direction.
  • the cross-sectional area ratio of 3 or more is preferable because the water pressure when raw water flows out from the water collecting pipe 12 to the water passage hole 25 can be further reduced.
  • the axial cross-sectional shape of the uneven portion of the water collecting pipe (corrugated pipe) 12 is preferably a trapezoidal shape as shown in FIGS. 4A and 4B, and the corner portion of the trapezoid is in contact with the hollow fiber membrane 13. A rounded one is preferred so that it will not be damaged.
  • 4 (a) shows the projection 22 closed by the closing surface 20, and FIG. 4 (b) shows no opening corresponding to the closing surface 20, and the projection 22 is open. Even those of the structure can be used. Since the interval (p 1 ) between the convex portions 22 adjacent in the axial direction is the same as the interval between the concave portions 21 adjacent in the axial direction, it is determined in consideration of the opening diameter of the water passage hole 25 formed in the concave portion 21. Is done.
  • the height of the convex portion 22 (depth of the concave portion 21) (h 1 ) can be about 6 to 8 mm.
  • the hollow fiber membrane module 10 includes at least one liquid outlet of a first liquid outlet (filtrated water outlet) 51 and a second liquid outlet (concentrated water outlet) 52 and an opening of the water collecting pipe 12 on the second cap 50 side. It has an outlet connecting pipe 70 to be connected.
  • the outlet connecting pipe 70 is used as a concentrated water outlet or a concentrated water line, and a liquid outlet connected to the outlet connecting pipe 70 is a concentrated water outlet.
  • the outlet connecting pipe 70 may be fixed to the cylindrical member 30 and connected to the water collecting pipe 12.
  • the outlet connecting pipe 70 may have a peripheral wall part 71 and a flange part 72 formed on the opening side close to the water collecting pipe.
  • the annular peripheral surface 73 in the radial direction of the flange portion 72 is in contact with the inner peripheral surface 31 b of the cylindrical member 30.
  • the outlet connecting pipe 70 may be in a state where the annular flat surface 72a of the flange portion is in contact with the annular step surface 31c of the cylindrical member.
  • the outlet connecting pipe 70 is a cylindrical space formed by a flange 72 of the connecting pipe, an outer peripheral surface of the peripheral wall 71 of the connecting pipe, and an inner peripheral surface 31b of the cylindrical member facing the outer peripheral surface of the peripheral wall 71 of the connecting pipe. It is fixed to the cylindrical member 30 with an adhesive filled in the (adhesive portion 60).
  • FIGS. 3 and 4 of Japanese Patent Application Laid-Open No. 2014-226607, as described in paragraphs 0031 to 0036.
  • the thing of the made aspect can also be used.
  • the first liquid outlet (filtrated water outlet) 51 and the second liquid outlet (concentrated water outlet) 52 are in the axial direction of the cylindrical case housing 11 or in a direction different from the axial direction, preferably orthogonal to the axial direction.
  • the liquid outlet that is not connected to the outlet connecting pipe 70 (that is, the filtrate water outlet 51) is formed in the axial direction of the cylindrical case housing 11 and connected to the outlet connecting pipe 70.
  • the concentrated water outlet 52 is preferably formed in a direction different from the axial direction of the cylindrical case housing 11, preferably in a direction orthogonal to the axial direction.
  • the filtrate outlet 51 is formed in the axial direction of the cylindrical case housing 11, and the concentrated water outlet 52 is formed in a direction different from the axial direction of the cylindrical case housing 11, preferably in a direction orthogonal to the axial direction.
  • the outlet connection pipe 70 is connected to a concentrated water outlet 52 formed in a direction different from the axial direction of the cylindrical case housing 11, preferably in a direction orthogonal to the axial direction.
  • the outlet connecting pipe 70 is formed in a direction orthogonal to the axial direction of the cylindrical case housing 11 using a bent pipe 74 such as an elbow pipe on the side connected to the opening of the water collecting pipe 12 on the second cap 50 side. It may be connected to the concentrated water outlet 52.
  • the bent tube 74 may be a 90 ° elbow tube or an elbow tube other than 90 °.
  • a flexible pipe (pipe) 75 may be connected between the bent pipe 74 and the concentrated water outlet 52.
  • the flexible pipe (pipe) 75 may be a resin pipe having flexibility.
  • an elastomer resin such as polyester, polyamide, polyolefin, or polyurethane, a vinyl chloride resin, or a soft polyethylene resin can be used. .
  • the concentrated water outlet connected to the outlet connecting pipe 70 is formed in the axial direction of the cylindrical case housing 11 (for example, the first liquid outlet 51), and the second liquid outlet not connected to the outlet connecting pipe 70 is a cylinder.
  • the outlet connecting pipe 70 is an opening on the second cap 50 side of the water collecting pipe 12. The side opposite to the side connected to the portion extends in the axial direction and is connected to the first liquid outlet 51.
  • the raw water inlet 41 may be formed in a direction different from the axial direction of the cylindrical case housing 11, as shown in FIG. 1, and preferably in a direction perpendicular to the axial direction, as shown in FIG. Further, it may be formed in the axial direction of the cylindrical case housing 11. From the viewpoint of easy replacement, the position of the raw water inlet 41 can be selected according to the position of the raw water inlet of the internal pressure type hollow fiber membrane module to be replaced.
  • the raw water inlet 41 and the opening of the water collecting pipe 12 on the first cap 40 side. May be connected by an inlet connecting pipe 80.
  • the inlet connecting pipe 80 By using the inlet connecting pipe 80, the raw water supply to the water collecting pipe 12 becomes efficient, and the filtration efficiency is improved.
  • the mode of connecting the inlet connecting pipe 80 and the water collecting pipe 12 may be the same as the mode of connecting the outlet connecting pipe 70 and the water collecting pipe 12 described above.
  • the inlet connection pipe 80 may have a water passage hole 81 on the peripheral surface.
  • the hollow fiber membrane bundle 13 has a plurality of inner raw water introduction holes 14 formed by penetrating the sealing resin 35a in the thickness direction.
  • the raw water can be supplied to the inner raw water introduction hole 14 through the water passage hole 81. Efficient filtration becomes possible by supplying raw water to the water collecting pipe 12 and the inner raw water introduction hole 14.
  • 2 to 12 water holes 81 are preferably formed on the peripheral surface of the inlet connecting pipe 80 at equal intervals, and more preferably 4 to 8 are formed.
  • the opening diameter of the water flow hole 81 can be adjusted by the size of the inlet connecting pipe 80, but is preferably 5 to 50 mm, more preferably 10 to 30 mm.
  • the diameter of the opening is an inner diameter, and when it is not circular, it is an inner diameter when converted to a circle having the same area.
  • a plurality of the water collecting pipes may be arranged in the cylindrical case housing 11. That is, in the hollow fiber membrane module of the present invention, one or more water collecting pipes may be arranged in the cylindrical case housing 11 in addition to the water collecting pipe 12.
  • the one or more water collecting pipes are preferably at the resin sealing portion 35b in the same manner as the water collecting pipe 12.
  • the resin sealing portions 35b and 35a are integrated with the case housing 11 and the hollow fiber membrane bundle 13 by a sealing resin.
  • the one or more water collecting pipes (excluding the water collecting pipe 12) have the same shape as the water collecting pipe 12, and the end portion on the first cap 40 side is opened, but is connected to the inlet connecting pipe 80. Absent.
  • the end portion on the second cap 50 side of the one or more water collecting pipes (excluding the water collecting pipe 12) may be either an opened aspect or an obstructed aspect.
  • the outlet connection pipe 70 is connected.
  • the inner diameter of the one or more water collecting pipes (excluding the water collecting pipe 12) is preferably smaller than the inner diameter of the water collecting pipe 12.
  • FIG. 8 is a figure used in order to demonstrate the arrangement
  • a hollow fiber membrane module 10A shown in FIG. 7 is different in that the hollow fiber membrane module 10 shown in FIG. 1 has an outer raw water introduction hole 24 instead of having an inner raw water introduction hole 14. Yes.
  • the first end portion 13a side of the hollow fiber membrane bundle 13 is integrated with the water collecting pipe 12 by a sealing resin (sealing resin portion 35a). It is not integrated with the peripheral surface.
  • the second end 13b side of the hollow fiber membrane bundle 13 is integrated with the water collecting pipe 12 and the cylindrical case housing 11 with a sealing resin (sealing resin portion 35b).
  • the width of the outer raw water introduction hole 24 (the distance between the inner peripheral surface of the cylindrical case housing 11 and the outer surface of the hollow fiber membrane bundle 13) varies depending on the diameter of the cylindrical case housing 11. When the (outer diameter) is 230 to 330 mm, 3 to 10 mm is preferable.
  • a plurality are provided in the circumferential direction by spacers 65 in which a plurality (six in FIG. 8) of outer raw water introduction holes 24 are arranged at intervals in the circumferential direction with respect to the inner peripheral surface of the cylindrical case housing 11. ).
  • the shape of the spacer 65 is not particularly limited as long as a space can be formed between the inner peripheral surface of the cylindrical case housing 11 and the outer surface on the first end portion 13a side of the hollow fiber membrane bundle 13.
  • the planar shape may be a rectangle such as a rectangle or a square, a similar shape, a circular shape, or a similar shape.
  • the thickness of the spacer 65 is a thickness corresponding to the width of the outer raw water introduction hole 23.
  • the width of the spacer 65 (the circumferential length of the cylindrical case housing 11) is preferably 10 to 30 mm.
  • the length of the spacer 65 is preferably 30 to 120 mm.
  • the spacer 65 may be made by attaching a plate made of synthetic resin or metal, but is preferably made of an adhesive layer fixed to the inner peripheral surface of the cylindrical case housing 11.
  • the adhesive layer (spacer 65) is in contact with the concave and convex portions (multiple concave portions) formed on the inner peripheral surface of the cylindrical case housing 11 from the viewpoint of enhancing durability (the adhesive enters the multiple concave portions). ) Is preferable.
  • the unevenness can be formed by a method such as roughening in advance at a position where the adhesive layer (spacer 65) is formed.
  • the adhesive for forming the adhesive layer (spacer 65) the above-described sealing resin can be used.
  • the hollow fiber membrane module 10 shown in FIGS. 1 and 2 is an embodiment having only the inner raw water introduction hole 14 (no outer raw water introduction hole 24), and the hollow shown in FIGS.
  • the thread membrane module 10A is an embodiment having only the outer raw water introduction hole 24 (the inner raw water introduction hole 14 is not provided).
  • the embodiment of FIGS. 1 and 2 and FIG. The embodiment having both the inner raw water introduction hole 14 and the outer raw water introduction hole 25 in combination with the embodiment of FIG.
  • the total opening area of the outer raw water introduction hole 24 includes the water collecting pipe 12 and the outer raw water introduction hole 24 (including the inner raw water introduction hole 14), which is 35 to 35%. It is preferably 65%, more preferably 40 to 60%.
  • the hollow fiber membrane module of the present invention is prepared by a known centrifugal bonding method (Japanese Patent Laid-Open Nos. 51-93788, 52-38797, 61-171503, 61-171504).
  • Japanese Patent Laid-Open Nos. 51-93788, 52-38797, 61-171503, 61-171504 Japanese Patent Laid-Open Nos. 51-93788, 52-38797, 61-171503, 61-171504
  • It can be manufactured by integrating the water collecting pipe 12, the hollow fiber membrane (bundle) 13, the case housing 11, and the cylindrical member 30 with a sealing resin.
  • the resin sealing portion 35b is cut and the end portion of the hollow fiber membrane (bundle) 13 is opened.
  • the resin sealing portion 35a does not open the end of the hollow fiber membrane (bundle) 13 by cutting.
  • the cylindrical space (adhesive portion 60) is filled with an adhesive and fixed to the cylindrical member 30.
  • the first cap 40 and the second cap 50 are attached.
  • the cap 50 is attached by fitting the peripheral edge of the opening to the header 15b so that the second liquid outlet (concentrated water outlet) 52 and the outlet connecting pipe 70 are connected.
  • a seal member can also be interposed at a contact portion between the first cap 40 or the second cap 50 and the header 15a or 15b.
  • the bent pipe 74 and the flexible pipe are provided in the outlet connecting pipe 70.
  • the bent pipe 74 can change the direction of the outlet connecting pipe 70 fixed to the cylindrical member 30 from the axial direction to a direction orthogonal to the axial direction, and a flexible pipe (pipe) 75. It is possible to easily connect to the concentrated water outlet 52 through the.
  • the hollow fiber membrane module 10A can be manufactured in the same manner as the hollow fiber membrane module 10.
  • the water collecting tube 12 and the hollow fiber membrane bundle 13 are integrated with a sealing resin, but the first end portion 13a of the hollow fiber membrane bundle 13 is radially outward.
  • the inner peripheral surface of the opposing cylindrical case housing 11 is not integrated to form the outer raw water introduction hole 24.
  • the spacer (adhesive layer) 65 is a spacer forming frame for forming the spacer 65 on the inner surface of the cylindrical case housing 11.
  • the sealing resin can be formed by introducing a predetermined number at predetermined positions (positions where the irregularities are formed when irregularities are formed) and introducing the sealing resin into the frame.
  • the spacer forming frame is a frame having a shape corresponding to the planar shape and thickness of the spacer 65. When the planar shape of the spacer 65 is a rectangle, the rectangular opening on one surface side is formed on the cylindrical case housing 11.
  • the rectangular opening on the other surface side opposite to the thickness direction is pressed against the inner peripheral surface and used in a state where it is pressed against the outer surface of the hollow fiber membrane bundle 13 on the first end portion 13a side.
  • the adhesive layer is used as the spacer 65
  • the inner peripheral surface portion of the cylindrical case housing 11 with which the adhesive layer abuts is roughened by a method suitable for the material of the cylindrical case housing 11 in advance. It is preferable to form irregularities (holes) by processing.
  • the surface roughening method file processing, laser processing, drilling processing, or the like can be used.
  • a filtration operation method of the hollow fiber membrane module 10 having the inner raw water introduction hole 14 shown in FIGS. 1 and 2 using a corrugated pipe as shown in FIG. 3 as a water collecting pipe will be described.
  • the raw water passing through the water collection pipe 12 enters the hollow fiber membrane bundle 13 through the water passage hole 25 formed in the recess 21 of the water collection pipe 12 and is filtered.
  • the first end portion 11 a side of the hollow fiber membrane bundle 13 is integrated with the cylindrical case housing 11 and the water collecting pipe 12 with a sealing resin at the resin sealing portion 35 a, and the sealing resin is sealed in the hollow fiber membrane bundle 13.
  • a plurality of inner raw water introduction holes 14 are formed penetrating 35a in the thickness direction, the raw water is filtered while being supplied to the central portion of the hollow fiber membrane bundle 13 and the surroundings other than the central portion. For this reason, since the bias of the raw water flow is reduced, it is difficult to form a sediment layer derived from the suspended substance on the surface of the hollow fiber membrane, and the filtration efficiency is improved.
  • the filtration operation method of the hollow fiber membrane module 10A is the same as the filtration operation method of the hollow fiber membrane module 10.
  • the outer raw water introduction hole 24 is provided instead of the inner raw water introduction hole 14, the following operation is performed. Behave differently.
  • the water enters the hollow fiber membrane bundle 13 through the water passage holes 25 formed in the recesses 21 of the water collecting pipe 12 and is filtered, and the raw water is hollow fiber membranes. It is filtered while being supplied to the outside of the bundle 13. For this reason, the bias
  • the outer raw water introduction hole 24 makes it easier for the cleaning water to be introduced between the inner peripheral surface of the cylindrical case housing 11 and the outer surface of the hollow fiber membrane bundle 13.
  • the filtrate obtained by filtering with the hollow fiber membrane bundle 13 fills the space 53 in the second cap 50, and then drains through the first liquid outlet (filtrated water outlet) 51, or It is sent to the permeate tank and stored.
  • the permeate stored in the permeate tank can be reused for back pressure washing of the hollow fiber membrane bundle 13 and the like.
  • Concentrated water generated as permeated water is discharged through the water collecting pipe 12, the tubular member 30 connected to the end of the water collecting pipe 12, the outlet connecting pipe 70, and the second liquid outlet (concentrated water outlet) 52.
  • back pressure washing may be performed.
  • Back pressure cleaning is performed by pressing back pressure cleaning water to which a chemical is added as needed from the second liquid outlet (concentrated water outlet) 52 side.
  • the backwash water is passed through the hollow fiber membrane bundle 13 and discharged from the raw water inlet 41 that also serves as the backwash water outlet.
  • the external pressure type hollow fiber membrane module 10 of the present invention has a deposit layer derived from a suspended substance on the surface of the hollow fiber membrane by setting the filling rate of the hollow fiber membrane bundle 13 in the range of 40% to 70%. Is also difficult to form, so that fouling is prevented and filtration efficiency is improved.
  • the external pressure type hollow fiber membrane module 10 of the present invention is an internal pressure type hollow fiber membrane when the turbidity of water to be treated (raw water) is increased in a water treatment system using the internal pressure type hollow fiber membrane module. Since the position of the module, the raw water inlet, the filtrate outlet, and the concentrated water outlet are the same, there is no need to devise the installation of piping outside the hollow fiber membrane module, and the internal pressure type hollow fiber membrane module to the external pressure type hollow fiber Replacement with a membrane module is easy.
  • the internal pressure type hollow fiber membrane module to be replaced has a hollow fiber membrane bundle in a cylindrical case housing having a first end having a raw water inlet and a second end opposite to the first end in the axial direction.
  • a first end of the cylindrical case housing is closed by a first cap having the raw water inlet, and a second end of the cylindrical case housing is a second having the filtrate outlet and the concentrated water outlet. It is preferable that the cap is closed with a cap from the viewpoint of easy replacement with the external pressure hollow fiber membrane module of the present invention.
  • the internal pressure type hollow fiber membrane module described in US Patent Application Publication No. 2003/0150807 or Japanese Patent No.
  • the filtered water outlet of the second cap is in the axial direction of the cylindrical case housing, and the concentrated water outlet is
  • the filtrate outlet 51 is formed in the axial direction of the cylindrical case housing 11, and is formed in a direction orthogonal to the axial direction of the cylindrical case housing. If the concentrated water outlet 52 is formed in a direction perpendicular to the axial direction of the cylindrical case housing 11, the positions of the filtrate outlet and the concentrated water outlet are the same. Replacement with a pressure type hollow fiber membrane module is easier.
  • Example Example 1 Using the hollow fiber membrane module 10 shown in FIGS. 1 and 2, a filtration operation for about 8 months was performed.
  • the detailed conditions of the hollow fiber membrane module 10 and the filtration operation are as follows.
  • Hollow fiber membrane module 10 (Hollow fiber membrane module 10) Hollow fiber membrane module 10: total length 1,360mm, outer diameter 284mm Case housing 11: Made of ABS resin, outer diameter 284mm, inner diameter 265mm, axial length 1,116mm Catch pipe 12: made of polyethylene, outer diameter 93 mm, inner diameter 75 mm Hollow fiber membrane bundle 13: made of cellulose acetate, filling rate 56% (S1: 48,362 mm 2 , S2: 27,077 mm 2 , filling rate is measured by the method described above), second end from first end 13a side 1,124mm length to the part 13b side, hollow fiber outer diameter 1.3mm, hollow fiber inner diameter 0.8mm, membrane area 80.4m 2 Inner raw water introduction hole 14: Six inner raw water introduction holes 14 having an opening area of 2.0 cm 2 are formed at equal intervals around the water collection pipe 12 in the hollow fiber membrane bundle of the sealing resin layer 35a.
  • the hollow fiber membrane module was disassembled and the state of the hollow fiber membrane bundle was confirmed.
  • the amount of sludge adhering to the hollow fiber membrane was relatively small (especially the hollow fiber membrane in the vicinity of the catchment basin was sludge-free). There was no adhesion), and no sludge sticking was observed.
  • Example 2 A filtration operation for about 8 months was performed using the hollow fiber membrane module 10A shown in FIGS.
  • the detailed conditions of the hollow fiber membrane module 10A are as follows. Filtration operation conditions are the same as in Example 1.
  • Hollow fiber membrane module 10A total length 1,360mm, outer diameter 284mm Case housing 11: Made of ABS resin, outer diameter 284mm, inner diameter 265mm, axial length 1,116mm Catch pipe 12: made of polyethylene, outer diameter 93 mm, inner diameter 75 mm Hollow fiber membrane bundle 13: made of cellulose acetate, filling rate 56% (S1: 48,362 mm 2 , S2: 27,077 mm 2 , filling rate is measured by the method described above), second end from first end 13a side 1,124mm length to the part 13b side, hollow fiber outer diameter 1.3mm, hollow fiber inner diameter 0.8mm, membrane area 80.4m 2
  • the cylindrical case housing 11 and the first end portion 13a of the hollow fiber membrane bundle 13 are formed by an adhesive layer (spacer) 24 having a thickness of 5 mm, a width (length in the circumferential direction) of 20 mm, and a length of 50 to 65 mm. The gap is separated into six places in the
  • the hollow fiber membrane module 10A was disassembled and the state of the hollow fiber membrane bundle was confirmed. As a result, the amount of sludge on the hollow fiber membrane was almost entirely absent, and Example 1 having inner raw water introduction holes Compared with the hollow fiber membrane module 10 of the present invention, there was very little, and no sludge clumps were observed.
  • the hollow fiber membrane module of the present invention can be used in water purification plant facilities, sewage treatment facilities, seawater desalination facilities, and the like.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

Pour fournir un module de membrane à fibres creuses de type à pression externe qui, pendant des opérations de filtration, est moins susceptible de provoquer l'encrassement de la membrane à fibres creuses et présente une excellente performance dans le nettoyage de la membrane à fibres creuses. Ce module de membrane à fibres creuses de type à pression externe comprend un tuyau de collecte d'eau 12 et un faisceau de membranes à fibres creuses 13 logé à l'intérieur d'un logement de boîtier cylindrique 11, le faisceau de membranes à fibres creuses 13 ayant un taux de remplissage de 40 à 70 %; une extrémité du logement de boîtier cylindrique 11 est recouverte d'un second capuchon 50 ayant une première sortie de liquide 51 et une seconde sortie de liquide 52; et l'une de la première sortie de liquide 51 et de la seconde sortie de liquide 52 est reliée, par l'intermédiaire d'un tuyau de connexion 70, à une ouverture du tuyau de collecte d'eau 12 sur le côté du second capuchon 50.
PCT/JP2019/016557 2018-05-07 2019-04-18 Module de membrane à fibres creuses de type à pression externe WO2019216147A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2018-089312 2018-05-07
JP2018089312 2018-05-07
JP2019-071027 2019-04-03
JP2019071027A JP7175578B2 (ja) 2018-05-07 2019-04-03 外圧式中空糸膜モジュール

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WO2019216147A1 true WO2019216147A1 (fr) 2019-11-14

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0426020U (fr) * 1990-06-27 1992-03-02
JPH06327905A (ja) * 1993-05-21 1994-11-29 Toray Ind Inc 脱気膜モジュールおよびその運転方法
WO2011150206A2 (fr) * 2010-05-27 2011-12-01 Hydranautics Module à fibres creuses
JP2012000600A (ja) * 2010-06-21 2012-01-05 Nikkiso Co Ltd 中空糸膜モジュール
WO2014007138A1 (fr) * 2012-07-05 2014-01-09 東レ株式会社 Module membranes à fibres creuses
JP2014226607A (ja) * 2013-05-22 2014-12-08 ダイセン・メンブレン・システムズ株式会社 中空糸膜モジュール

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0426020U (fr) * 1990-06-27 1992-03-02
JPH06327905A (ja) * 1993-05-21 1994-11-29 Toray Ind Inc 脱気膜モジュールおよびその運転方法
WO2011150206A2 (fr) * 2010-05-27 2011-12-01 Hydranautics Module à fibres creuses
JP2012000600A (ja) * 2010-06-21 2012-01-05 Nikkiso Co Ltd 中空糸膜モジュール
WO2014007138A1 (fr) * 2012-07-05 2014-01-09 東レ株式会社 Module membranes à fibres creuses
JP2014226607A (ja) * 2013-05-22 2014-12-08 ダイセン・メンブレン・システムズ株式会社 中空糸膜モジュール

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