JP2014014736A - Membrane module and method of producing membrane module, and membrane unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a membrane module and a membrane unit which are excellent in durability and chemical resistance.SOLUTION: A membrane module 1 includes ceramic membranes 2 and water collecting parts 3. The ceramic membrane 2 is a plate-shaped filter member, and the ceramic membranes 2 are juxtaposed so that the principal surfaces 2a thereof face each other with a distance therebetween. The water collecting parts 3 are provided at the ends on the side surface 2c sides of the ceramic membranes 2 to support the ceramic membranes 2. In the water collecting part 3, a water collecting passage 3c is formed by penetrating the water collecting part 3 along the longitudinal direction of the side surface 2c of the ceramic membrane 2. The water collecting passage 3c is formed by communicating with a flow passage of each ceramic membrane 2, and treated water filtered by the ceramic membranes 2 passes through the flow passages to be collected in the water collecting passage 3c. The water collecting part 3 is formed by molding.

Description

  The present invention relates to a membrane module for treating purified water, industrial wastewater, and the like, a method for manufacturing the membrane module, and a membrane unit.

  Membrane separation technology has been used for seawater desalination, water purification, gas separation, blood purification, etc., but recently, from the viewpoint of environmental conservation, research to apply membrane separation technology to wastewater treatment has been promoted. It has been.

  Conventionally, sand filtration, gravity precipitation, and the like have been performed as methods for solid-liquid separation of water to be treated with high turbidity, such as water purification treatment, sewage treatment, or industrial wastewater treatment. However, solid-liquid separation by these methods has problems that the quality of the treated water obtained may be insufficient and that a vast site is required for solid-liquid separation.

  As a method for solving this problem, various methods for solid-liquid separation of water to be treated using a membrane module provided with a separation membrane such as a microfiltration membrane and an ultrafiltration membrane have been recently studied. When water to be treated is filtered using a separation membrane, treated water with high water quality can be obtained.

  The membrane module has a filtration member such as a ceramic membrane and a water collecting part that holds the filtration member (for example, Patent Documents 1 to 4). The water collecting part is formed with a water collecting passage communicating with the flow path formed in the filtration member, and the treated water filtered by the filtration membrane is discharged outside the system through the flow path of the filtering member and the water collecting passage of the water collecting part. Discharged.

JP 2006-15233 A International Publication No. 2010/015374 JP 2005-125198 A Japanese Patent Laid-Open No. 10-57775

  However, when the filtered water outlet is provided on the surface opposite to the surface on which the ceramic membrane is provided, as in the water collecting part of the membrane module of Patent Document 1, each outlet is provided when the membrane modules are stacked in multiple stages. There is a risk that the cost of the membrane module may be increased and the assembly process may be complicated, such as the need for a connector for pipe connection. Moreover, if the water collecting part is formed by the header part for fixing the ceramic membrane and the cover on which the outlet is formed, the joining part may be weakened because the header part and the cover are face-to-face joined.

  The water collecting part of the membrane module of Patent Document 2 forms the water collecting part by closing the opening of the frame holding the ceramic membrane with the cover plate. Therefore, depending on the strength of the frame and the cover plate, the membrane module is loaded. When it overlaps, there exists a possibility that the long-term reliability of a membrane module may fall. In addition, when individual ceramic membranes are partitioned by a partition plate having a notch, when cleaning the ceramic membranes by applying back pressure, the pressure transmission to each ceramic membrane does not act sufficiently, and a cleaning effect can be expected. There is a risk of disappearing. In addition, the holding portion of the ceramic film is not flat and has a complicated shape, and it becomes complicated to arrange a sealing member that prevents the resin from entering the opening of the ceramic film when the holding portion is formed of resin. . For example, when using a mold member for forming a partition plate and an individual water collection chamber, it is necessary to provide a seal member between the tip portion of the mold member and the side surface of the ceramic membrane in which the opening is formed. Function may be degraded.

  That is, when the water collecting part is formed by joining a plurality of members with an adhesive, poor adhesion of the adhesive part may cause leakage. Moreover, in order to improve the long-term reliability of a membrane module, improvement of durability and chemical resistance of a water collection part is calculated | required.

  In view of the above circumstances, an object of the present invention is to provide a technique that contributes to an improvement in durability and chemical resistance of a water collecting portion of a membrane module.

  The membrane module of the present invention that achieves the above object has a filtration membrane on the outer surface, a filtration member in which a flow path through which treated water treated with this filtration membrane flows is formed, and holds this filtration member A membrane module having a water collecting portion formed with a water collecting passage communicating with the flow path of the filtration member, and forming the water collecting portion integrally, and penetrating the water collecting passage in the stacking direction of the water collecting portion. It is characterized by forming.

  In addition, the membrane unit of the present invention that achieves the above object is characterized by being configured by stacking the membrane modules.

  Moreover, the membrane module manufacturing method of the present invention that achieves the above object is characterized in that the water collecting portion of the membrane module is formed by molding.

  According to the above invention, it can contribute to the improvement of durability and chemical resistance of the water collecting part of the membrane module.

It is a figure which shows the membrane module which concerns on embodiment of this invention, (a) Top view, (b) Side view, (c) Front view. It is a figure which shows the water collection part of the membrane module which concerns on embodiment of this invention, (a) AA sectional drawing, (b) It is a side view. It is a figure which shows the water collection part of the membrane module which concerns on embodiment of this invention, (a) BB sectional drawing, (b) Top view. It is a figure which shows the O-ring mounting site | part of the water collection part of the membrane module which concerns on embodiment of this invention. It is a figure which shows the membrane unit which concerns on embodiment of this invention, (a) Front view, (b) Side view, (c) It is a front view at the time of providing two rows of membrane modules. It is a figure which shows the membrane unit which concerns on embodiment of this invention, (a) Top view, (b) Side view. It is explanatory drawing explaining the manufacturing method of the membrane module which concerns on embodiment of this invention, (a) The figure which shows the metal mold | die and jig | tool frame which fixed the ceramic membrane, (b) The detail of the metal mold | die which fixed the ceramic membrane. (C) It is explanatory drawing explaining the process of casting resin to the metal mold | die which fixed the ceramic film, (d) It is explanatory drawing explaining the process of removing a core after casting.

  A membrane module, a membrane module manufacturing method, and a membrane unit according to an embodiment of the present invention will be described in detail with reference to the drawings.

[Membrane module]
FIG. 1 is a view showing a membrane module according to an embodiment of the present invention. As shown in FIG. 1, a membrane module 1 according to an embodiment of the present invention includes a ceramic membrane 2 and a water collection unit 3.

  The ceramic membrane 2 is a plate-shaped filtration member. The ceramic films 2 are arranged side by side so that the main surfaces 2a of the ceramic films 2 are spaced apart from each other. A filter membrane is provided on the pair of main surfaces 2 a of the ceramic membrane 2. Inside the ceramic membrane 2, a flow path (not shown) is formed through which treated water that has passed through the filtration membrane flows. As shown in FIG. 2 (a), the opening 2 b of the flow path is formed on the side surface 2 c of the ceramic film 2. In the membrane module 1, the opening 2 b of the flow path is formed on both end surfaces of the ceramic film 2, but the opening of the flow path may be provided on at least one side surface of the ceramic film 2.

  The water collecting portions 3 are respectively provided at the end portions on the side surface 2 c side of the ceramic membrane 2 and hold the ceramic membrane 2. As shown in FIGS. 2A and 2B, a positioning convex portion 3 a is formed on the upper surface of the water collecting portion 3, and a positioning concave portion 3 b is formed on the lower surface of the water collecting portion 3. When the membrane modules 1 are stacked, the membrane modules 1 are positioned by fitting the convex portions 3a and the concave portions 3b of the water collecting portions 3 of the membrane modules 1 adjacent to each other in the vertical direction.

  As shown in FIG. 3A, a water collection channel 3 c is formed in the water collection unit 3 along the longitudinal direction of the side surface 2 c of the ceramic membrane 2. The water collection channel 3 c is formed through the water collection unit 3. As shown in FIG. 3 (b), the water collection channel 3c is formed in communication with the flow channel 2d of each ceramic membrane 2, and the treated water filtered by the ceramic membrane 2 passes through the flow channel 2d and is collected in the water collection channel 3c. It is done. Moreover, the groove part 3e is formed in the both end surfaces 3d and 3d of the water collection part 3 in which the opening part of this water collection path 3c is formed so that the water collection path 3c may be enclosed. As shown in FIG. 4, when stacking the membrane modules 1, the water tightness between the stacked membrane modules 1 is ensured by providing the O-ring 4 in the groove 3 e and stacking the membrane modules 1. . As shown in FIG. 3 (a), a groove 3f is formed on the surface of the water collecting portion 3 on which the ceramic membrane 2 is fixed, and this groove 3f is formed in the membrane module during stacking work of the membrane module 1 or the like. Used as a handle when moving 1.

  The water collection part 3 is formed by a mold, for example. The material used for the mold is selected based on conditions such as durability and chemical resistance from inorganic materials such as metals and ceramics and organic materials such as resins. Examples of the resin used for the mold include a thermosetting resin, a thermoplastic resin, a two-component curable resin, and an ultraviolet curable resin. From these resins, materials suitable for the properties of the liquid to be treated including durability are selected. More specifically, examples of the thermosetting resin include an epoxy resin, a melamine resin, and a phenol resin, and examples of the thermoplastic resin include a vinyl chloride resin, an ABS resin, a fluororesin, polyethylene, polypropylene, and polystyrene. Furthermore, examples of the two-component curable resin include a urethane-based resin. If a hard urethane resin is used as the urethane-based resin, it is possible to work at room temperature, so that the water collection section 3 having high workability and excellent durability and chemical resistance can be formed. Examples of the hard urethane resin include a hydrated alumina-containing polyester polyol type urethane resin.

  As shown in FIGS. 5A and 5B, the membrane unit 6 is configured by stacking a plurality of membrane modules 1 on a gantry 5. The plurality of membrane modules 1 are positioned by fitting the convex portions 3a and the concave portions 3b of the water collecting portions 3 adjacent to each other vertically, and the water collecting portions 3 of each membrane module 1 are O-rings ( (Not shown). Membrane module fixing members 7 and 7 are provided above and below the stacked membrane modules 1, and the stacked membrane modules 1 are fixed by fastening the module fixing members 7 and 7 with bolts 8. When the membrane modules 1 are stacked in this way, the water collecting passages 3c (not shown) of the membrane modules 1 communicate with each other to form one flow path. At the upper end surface of the membrane unit 6, a filtered water discharge port 9 for discharging treated water flowing through this flow path is provided. Further, an eyebolt 10 is provided on the upper end surface of the membrane unit 6, and the membrane unit 6 is suspended when the membrane unit 6 is taken in and out of the liquid to be treated.

  An aeration device (not shown) or the like is disposed inside the gantry 5, and the water to be treated is introduced into the membrane module 1 by upward flow generated by bubbles from the aeration device. Further, as shown in FIG. 6, a side plate 11 is provided to face the main surface 2 a of the ceramic membrane 2 located on the outermost side of each membrane module 1. Cup portions 11 a are provided at both side ends of the side plate 11, and the side plates 11 are provided on the membrane unit 6 by engaging the cup portions 11 a with the bolts 8. The side plate 11 has a U-shaped cross section (DD cross section), and the side plates 11 adjacent to each other in the vertical direction are engaged with each other to fix the side plate 11 at a predetermined position.

[Membrane module manufacturing method]
With reference to FIG. 7, the manufacturing method of the membrane module 1 which concerns on embodiment of this invention is demonstrated.

  As shown in FIG. 7A, the ceramic film 2 is provided between the casting mold 12A and the mold 12B, and the mold 12A and the mold 12B to which the ceramic film 2 is fixed serve as a jig frame. 13 and 13 are fixed. At this time, a film interval holding jig 14 is provided between the jig frames 13 and 13, and the ceramic films 2 are arranged in parallel at a predetermined interval.

  As shown in FIG. 7B, the mold 12A (and the mold 12B) includes cores 15a and 15b and outer frames 16 and 17 that hold the cores 15a and 15b. A release agent is applied to the cores 15a and 15b in advance. A side surface 2c in which an opening of the ceramic film 2 is formed is attached to the core 15a via a sealing material 18 for preventing resin intrusion. A core 15 b is provided on the surface of the core 15 a opposite to the surface to which the sealing material 18 is attached, and the cores 15 a and 15 b are fixed to the outer frame 16. The outer frame 16 has a pair of openings, the ceramic film 2 extends from one opening, and the other opening is closed by the outer frame 17.

  As shown in FIG. 7C, a space formed by the outer frame 16 and the outer frame 17 in which the jig frame 13 is erected with the sticking surface of the sealing material 18 facing up and the cores 15a and 15b are fixed. Resin is injected into the portion 19 (indicated by hatching in FIG. 7B). The injected resin is solidified to form a water collecting portion 3 in which the ceramic membrane 2 is fixed integrally. Finally, as shown in FIG. 7 (d), the core 15 b and the core 15 a are removed from the resin in this order to form the water collection passage 3 c in the water collection section 3, and then the outer frames 16 and 17 are removed.

  As described above, according to the membrane module and the membrane unit of the present invention, the water collecting part that holds the filtering member and has the water collecting channel that communicates with the flow path formed in the filtering member is integrally formed. The durability and chemical resistance of the water part are improved. Moreover, the water-tightness of a water collection part improves by forming a water collection part integrally, and durability when a water collection part is piled up improves.

  Further, when the water collecting part is formed by a mold, the water collecting part can be formed without using an adhesive, and the water tightness and chemical resistance of the water collecting part are improved. In particular, when a resin having excellent chemical resistance is used as the mold resin, the chemical resistance of the water collecting portion is further improved, and the long-term reliability of the membrane module and the membrane unit is improved. In addition, by forming the water collecting part with a mold, a water collecting channel can be formed in the water collecting part simultaneously with the integration of the filtration member and the water collecting part, so that the productivity of the membrane module is improved.

  Moreover, since the water collection part is opened up and down, a core can be easily removed at the time of casting, and the productivity of a membrane module and a membrane unit improves. By forming the water collecting portion in this way, it is possible to maintain good watertight characteristics between the stacked water collecting portions only by stacking the water collecting portions through a sealing material such as an O-ring. The productivity of the membrane unit is improved.

  In addition, according to the membrane module manufacturing method of the present invention, a water collecting part in which a water collecting channel is integrally formed can be obtained, so that the durability and chemical resistance of the membrane module are improved. Furthermore, since the filtration member is fixed to the water collecting portion and the water collecting passage of the water collecting portion is simultaneously formed, the productivity of the membrane module is improved.

  The membrane module, the method for manufacturing the membrane module, and the membrane unit of the present invention are not limited to the described embodiments, and can be appropriately modified within a range that does not impair the characteristics thereof. Modified forms also belong to the technical scope of the present invention.

  For example, the filtration member constituting the membrane module is not limited to a ceramic membrane, and an organic hollow fiber membrane, an organic flat membrane, an inorganic flat membrane, an inorganic single tube membrane, or the like can be used. Examples of the material of the filter member include cellulose, polyolefin, polysulfone, PVDF (polyvinylidene fluoride), PTFE (polytetrafluoroethylene), and the like.

  Moreover, the pore diameter of the separation membrane provided in the filtration member is selected according to the particle diameter of the substance to be subjected to solid-liquid separation. For example, if it is used for solid-liquid separation of activated sludge, a filtration membrane having a pore size of 0.5 μm or less is used, and if sterilization is required, such as filtration of purified water, a pore size of 0.1 μm or less is used. A filtration membrane is used.

  Moreover, the number of membrane modules which comprise a membrane unit uses a required number of membrane modules suitably according to the processing amount of to-be-processed water, and the water depth of to-be-processed water. Moreover, as shown in FIG.5 (c), the membrane unit 6a can also be comprised by arranging the membrane module 1 piled up on the mount frame 5 in parallel.

DESCRIPTION OF SYMBOLS 1 ... Membrane module 2 ... Ceramic membrane (filtration member)
2a ... Main surface, 2b ... Opening part, 2c ... Side, 2d ... Flow path 3 ... Water collecting part 3a ... Convex part, 3b ... Concave part, 3c ... Water collecting channel, 3d ... End face, 3e ... Groove part, 3f ... Groove part 4 ... O-ring 5 ... frame 6, 6a ... membrane unit 7 ... membrane module fixing member 8 ... bolt 9 ... filtered water discharge port 10 ... eye bolt 11 ... side plate 11a ... cup part 12A, 12B ... mold 13 ... jig frame 14 ... membrane Spacing holding jigs 15a, 15b ... cores 16, 17 ... outer frame 18 ... sealing material 19 ... space

Claims (8)

A filtration member having a filtration membrane provided on the outer surface and a flow path through which a treatment liquid filtered by the filtration membrane flows;
A water collecting channel having an opening at a pair of end surfaces, and a water collecting unit in which the water collecting channel and the flow path communicate with each other on one side surface between the end surfaces, and the filtration member is provided integrally.
A membrane module comprising: The membrane module according to claim 1, wherein the water collecting part is formed by a mold. The membrane module according to claim 2, wherein the water collecting portion is formed of a resin. The membrane module according to claim 3, wherein the resin has chemical resistance. The membrane module according to claim 4, wherein the resin is a hard urethane resin. 6. The membrane module according to claim 5, wherein the resin is a hydrated alumina-containing polyester polyol type urethane resin. A membrane unit, wherein the membrane module according to any one of claims 1 to 6 is stacked with an end face where an opening of a water collecting channel of the membrane module is formed facing each other. A method for producing a membrane module comprising a filtration membrane provided on an outer surface and a filtration member having a flow path through which a treatment liquid filtered by the filtration membrane flows,
A core is provided via a sealing material on the surface where the opening of the flow path of the filtering member is formed,
Mold the outer periphery of the core,
A method for manufacturing a membrane module, wherein the core and the sealing material are removed.

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