Spiral membrane module

Abstract

To provide a thrust load support structure applicable to a vessel of both types of an end port and a side port and that is easily manufactured, and a spiral membrane module equipped with the same.SOLUTION: A spiral type membrane module 100 comprises: a vessel 110 having a supply liquid inlet port and a concentrated liquid outlet port which are end or side ports, and a transmitted liquid outlet port; one or more spiral membrane elements E housed in the vessel 110; an outlet adaptor 123 communicated with an outlet of a catchment pipe 5 of the spiral membrane element E of the furthest outlet side and connected to the transmitted liquid outlet port; and a thrust load support part 150 that is connected to the output adaptor 123 and that abuts against the membrane element end of the furthest outlet side to support the thrust load.SELECTED DRAWING: Figure 1A

Description

[Technical Field]

[0001] The present invention relates to a spiral-wound membrane module having spiral-wound membrane elements housed inside a pressure vessel. [Background technology]

[0002] Spiral-wound membrane elements (hereinafter sometimes referred to as "membrane elements") are manufactured by wrapping a flat membrane, a permeate spacer, and a feed water spacer around a water collection pipe, and then applying FRP (fiber reinforced plastic) to the outer periphery. Membrane elements (usually 1 to 7 elements) are loaded into a vessel, which is a pressure-resistant container, and used as a membrane module. The membrane elements inside the vessel are subjected to a thrust load caused by the pressure difference between the inlet and outlet of the vessel.

[0003] Membrane elements come in sizes (diameters) of 8 inches, 4 inches, 2.5 inches, etc., but the 8-inch size membrane element is the most widely used for applications such as large-scale treatment facilities. There are two main patterns for the structure of 8-inch size membrane elements: a type in which the water collection pipe protrudes from the end face, as shown in Figure 5A (hereinafter referred to as the "water collection pipe protruding type"), and a type in which the end face, as shown in Figure 5B, is approximately flat (hereinafter referred to as the "flush cut type").

[0004] In each membrane element with a protruding collection pipe, the protruding collection pipes are connected with outer connectors, and thrust loads are transmitted between the collection pipes and supported primarily by the collection pipes. For this reason, for example, the collection pipes of an 8-inch membrane element with a protruding collection pipe require high strength, and high-strength materials such as FRP are mainly used for them.

[0005] Each membrane element of the flush-cut type is connected by an interconnector installed inside the water collection pipe, and the thrust load is transmitted over the entire end face of the anti-telescope material. Therefore, the water collection pipe does not require the same strength as the protruding type, and is often made of ABS resin or modified PPE resin.

[0006] Furthermore, flush-cut membrane elements require a support structure downstream of the last membrane element to withstand the thrust load inside the vessel. A component called a thrust ring (see Figure 5B) or thrust cone is usually installed. A thrust cone is a truncated cone-shaped component with an opening on the side.

[0007] Patent Document 1 discloses a thrust load adjusting and holding member (7, 22) as an example of a thrust cone. The thrust load adjusting and holding member (22) has a plurality of holes (22a) formed therein for allowing a fluid to pass through. The holes (22a) are uniformly arranged radially from the permeate collection pipe (12) as a central axis toward the inner wall of the pressure vessel (2). [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 6268490 Summary of the Invention [Problem to be solved by the invention]

[0009] Because membrane elements with protruding collection pipes have a smaller internal membrane area than membrane elements with flush-cut shapes, it is sometimes necessary to change from membrane elements with protruding collection pipes to membrane elements with flush-cut shapes while using the same vessel for reasons such as increasing the amount of treated water. In this case, a new thrust ring (see Figure 5B) must be installed. In the case of an end-port type vessel, as shown in Figure 5B, in which the outlet port for the concentrated liquid is located at the end of the vessel in the longitudinal direction, a cylindrical part cut to the required length can be used as the thrust ring. However, a new thrust ring must be manufactured.

[0010] On the other hand, for side-port type vessels, where the outlet port for the concentrated liquid is located on the side of the vessel, it is difficult to accommodate with a thrust ring. Typically, a thrust cone type part is used for side-port type vessels to prevent the outlet port for the concentrated liquid from being blocked. To manufacture a thrust cone, a mold must usually be prepared and then injection molded. Molds require a large investment and are difficult to manufacture unless mass production is assumed. When changing from a type with a protruding collection pipe to a type with a flush-cut pipe at a water treatment site using a side-port vessel, a support structure that can easily support thrust loads is required.

[0011] Therefore, an object of the present invention is to provide a thrust load support structure that can be applied to both end port and side port types of vessels and is easy to manufacture, and a spiral-wound membrane module equipped with the same. [Means for solving the problem]

[0012] As a result of extensive research to solve the above problems, the inventors discovered that by connecting to an outlet adapter and abutting against the end of the membrane element, thrust loads can be effectively supported, and thus completed the present invention. That is, the present invention includes the following aspects.

[0013] [1] A spiral membrane module having a spiral membrane element therein, a vessel (pressure-resistant vessel) having a feed inlet port, a concentrate outlet port, and a permeate outlet port, which are end ports or side ports; one or more spiral-wound membrane elements housed in the vessel; an outlet adapter that is connected to the outlet of the water collection pipe of the spiral membrane element on the most outlet side and is connected to the permeate outlet port; a thrust load support portion that extends from the outlet adapter along the radial direction of the membrane element end portion on the most outlet side and abuts against the membrane element end portion to support a thrust load; Equipped with. The membrane element may be 8 inches in size. The membrane element may be of a flush-cut shape.

[0014] The end of the membrane element on the most outlet side may be an end of an anti-telescope material or a seal carrier. The anti-telescope material includes a disk-shaped body provided at an end of the membrane element; a central annular portion at the center of the main body into which a water collection pipe is inserted; a concentrate hole in the body around the central annular portion for passing a concentrate therethrough; The body may include a rib.

[0015] The thrust load support portion may be, for example, a polygonal plate, a disk, a cross plate, or a star plate. The thrust load support portion may be provided with a liquid passage hole for passing the concentrated liquid.

[0016] [2] The spiral membrane module according to [1], wherein when the thrust load supporting part is made of a metal material, the thickness thereof is 5 mm or more.

[0017] [3] The spiral membrane module according to [1], wherein when the thrust load supporting portion is made of a resin material, the thickness thereof is 10 mm or more.

[0018] [4] The spiral membrane module according to any one of [1] to [3], wherein the outer diameter (D_s) of the thrust load supporting portion is φ125 mm or more and φ160 mm or less.

[0019] [5] The spiral membrane module according to any one of [1] to [4], wherein at least a part or all of the radially outermost end of the thrust load support part abuts against an outer annular rib of the membrane element end (e.g., anti-telescope material) on the most outlet side.

[0020] [6] The spiral membrane module according to any one of [1] to [5], wherein the number of fluid passage holes provided in the thrust load support part is more distal to the center of the thrust load support part in the radial direction, or the total area of ​​the fluid passage holes on the distal side is larger than the total area of ​​the fluid passage holes on the central side.

[0021] [7] The spiral membrane module according to any one of [1] to [6], wherein when the thrust load support parts are arranged so as to block all of the concentrate passage outlets at the ends of the membrane elements, for example, when all of the radially outermost ends of the thrust load support parts abut against the outer annular rib of the anti-telescopic material on the outermost outlet side, the total area of ​​the passage holes provided in the thrust load support parts is 10% or more of the area corresponding to the inner diameter of the vessel. The inner diameter of the vessel is the inner diameter of the portion where the membrane element is loaded.

[0022] [effect] (1) The thrust load support portion extends from the outlet adapter along the radial direction of the membrane element end on the most outlet side and abuts against the membrane element end, thereby making it possible to effectively support the thrust load. (2) It can be applied to both end port and side port type vessels. [Brief explanation of the drawings]

[0023] [Figure 1A] FIG. 1 is a schematic diagram showing an example of a spiral membrane module according to a first embodiment. [Figure 1B] FIG. 1 is a schematic diagram showing an example of a spiral membrane element. [Figure 2] 1 is a schematic configuration diagram showing an example of a thrust load supporting portion of the first embodiment. FIG. [Figure 3] FIG. 10 is a schematic configuration diagram showing an example of a thrust load supporting portion of the second embodiment. [Figure 4] 10A and 10B are diagrams illustrating examples of fluid passage holes in the thrust load support portion. [Figure 5A] FIG. 1 is a schematic diagram showing an example of a spiral membrane module with a protruding water collection pipe according to the prior art. [Figure 5B] FIG. 1 is a schematic diagram showing an example of a conventional spiral membrane module of a flush-cut shape. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, a first embodiment of the present invention will be described. In this specification, the terms "upstream," "downstream," "upstream side," and "downstream side" are based on the flow direction of the feed liquid (liquid to be treated) sent to the spiral membrane module.

[0025] (Spiral membrane module) FIG. 1A shows an example of a spiral membrane module 100. The spiral membrane module 100 can accommodate one or more 8-inch spiral membrane elements E (hereinafter referred to as "membrane elements") of a flush-cut shape in series. In the first embodiment, the spiral membrane module 100 accommodates four membrane elements E in a vessel 110, which is a pressure-resistant container. The configuration of the membrane element E will be described later.

[0026] Adjacent membrane elements E are in contact with each other at the downstream end 131 and upstream end 130 of the upstream membrane element E, and the upstream and downstream water collection pipes 5 are in contact with each other. An interconnector 122 is provided inside the connection point of this water collection pipe 5. One or more liquid leakage prevention members 130a, 122a such as O-rings are provided on the outer peripheral surfaces of the upstream end 130 and the upstream and downstream sides of the interconnector 122, respectively. In this embodiment, the upstream end 130 and the downstream end 131 are configured as anti-telescope materials.

[0027] The vessel 110 has a feed inlet port 111 through which the feed liquid to be treated is introduced, a permeate outlet port 112 through which the permeate is discharged, and a concentrate outlet port 113 through which the concentrate is discharged. The concentrate outlet port 113 in Figures 1A and 2(a) is an example of an end port. The concentrate outlet port 113 in Figure 2(b) is an example of a side port.

[0028] The inlet adapter 121 provided inside the upstream side of the vessel 110 is connected so that the adapter downstream side 121b, which functions as a cap, closes the upstream part of the water collection pipe 5 of the most upstream membrane element E, and the adapter upstream side 121a is connected to the upstream recess 110a of the vessel 110. The adjustment part 110c functions to adjust the connection length between the adapter upstream side 121a and the upstream recess 110a, and to push the accommodated membrane element E downstream.

[0029] The outlet adapter 123 provided inside the downstream side of the vessel 110 has an adapter upstream side 123a connected to the downstream part of the water collection pipe 5 of the most downstream membrane element E so as to allow the permeate to pass through, and an adapter downstream side 123b connected to the outlet port 112 of the downstream end 110b of the vessel 110 so as to allow the permeate to pass through. The outlet adapter 123 is provided with a through-hole 123c that allows the permeate to pass from the adapter upstream side 123a to the adapter downstream side 123b. Leak prevention members such as O-rings (not shown) are provided on the outer peripheral surfaces of the adapter upstream side 121a and the adapter downstream side 121b of the inlet adapter 121. Leak prevention members such as O-rings (not shown) are provided on the outer peripheral surfaces of the adapter upstream side 123a and the adapter downstream side 123b of the outlet adapter 123.

[0030] (Spiral membrane element) 1B shows an example of a membrane element E. The membrane element E comprises a perforated water collection pipe 5, a wound body R including a membrane leaf L and a feed-side channel material 2 wound around the water collection pipe 5, and an exterior material 20 provided on the outer periphery of the wound body R. As shown in FIG. 1B, the membrane element E comprises, for example, a plurality of membrane leaves L each having a permeate-side channel material 3 interposed between opposing separation membranes 1, a feed-side channel material 2 interposed between the membrane leaves L, a perforated water collection pipe 5 around which the membrane leaves L and the feed-side channel material 2 are wound, and a sealing portion that prevents mixing of the feed-side channel and the permeate-side channel.

[0031] In this embodiment, an example is shown in which the sealed portion includes both end sealed portions 11 and an outer peripheral sealed portion 12. Of the sealed portions, the both end sealed portions 11 are formed by sealing two edge portions on both sides in the axial direction A1 of the membrane leaf L with an adhesive. The outer peripheral sealed portion 12 is formed by sealing the edge portion of the outer peripheral tip of the membrane leaf L with an adhesive.

[0032] 1B, it is preferable to have a central sealing portion 13 in which the perforated water collection pipe 5 and the base end of the membrane leaf L are sealed with an adhesive. The membrane element E of this embodiment has a wound body R in which the membrane leaf L and the feed-side channel material 2 are wound around the water collection pipe 5 via such a central sealing portion 13.

[0033] In the membrane element E, an upstream end 130 of a seal carrier or the like is provided on the upstream side of the wound body R, and a downstream end 131 of an anti-telescope material or the like is provided on the downstream side, integrally with the wound body R. In another embodiment, in the membrane element E, the upstream end 130 may be detachable from the wound body R, and the downstream end 131 may be detachable from the wound body R.

[0034] The membrane element E is housed in a vessel 110. A feed liquid is supplied from the upstream end face side of the membrane element E. The supplied feed liquid flows along the feed-side flow path material 2 in a direction parallel to the axial direction of the water collection pipe 5, and is discharged as a concentrated liquid from the downstream end face side of the membrane element E. Furthermore, the permeated liquid that has permeated the separation membrane 1 while the feed liquid is flowing along the feed-side flow path material 2 flows along the permeation-side flow path material 3, and then flows into the water collection pipe 5 through an opening (not shown) and is discharged from the downstream end of the water collection pipe 5.

[0035] (Supply side channel material) The feed-side channel material 2 generally serves to ensure gaps for uniformly supplying the fluid to the membrane surface. Such a feed-side channel material 2 can be, for example, a net, a knitted fabric, or a textured sheet, and a material with a maximum thickness of approximately 0.1 to 3 mm can be used as needed. It is preferable that such a feed-side channel material 2 has low pressure loss, and it is also preferable that it generates a moderate turbulence effect. Channel materials are installed on both sides of the separation membrane 1, and it is common to use different channel materials for the feed-side channel material 2 on the feed liquid side and the permeate-side channel material 3 on the permeate side. It is preferable to use a thick, coarse-mesh net-like channel material for the feed-side channel material 2, while a fine-mesh woven or knitted channel material for the permeate-side channel material 3.

[0036] The feed-side channel material 2 is provided on the inner surface side of the bifold composite semipermeable membrane when an RO membrane or an NF membrane is used in applications such as seawater desalination, wastewater treatment, etc. The structure of the feed-side channel material 2 can preferably be a mesh structure in which linear members are generally arranged in a lattice pattern.

[0037] The material constituting the feed-side channel material 2 is not particularly limited, but polyethylene, polypropylene, etc. are used. These resins may contain a bactericide or antibacterial agent. The thickness of this feed-side channel material 2 is generally 0.2 to 2.0 mm, and preferably 0.5 to 1.0 mm. If the thickness is too thick, the amount of membrane that can be accommodated in the membrane element and the amount of permeation will decrease. Conversely, if the thickness is too thin, contaminants will easily adhere, which will easily cause a deterioration in permeation performance.

[0038] (water collection pipe) The water collection pipe 5 may be any pipe having openings around the periphery, and any conventional pipe may be used. Generally, when used in seawater desalination, wastewater treatment, etc., the permeate that has passed through the separation membrane 1 enters the water collection pipe 5 through the holes in the wall, forming a permeate flow path. The length of the water collection pipe 5 is generally longer than the axial length of the wound body R, but a water collection pipe 5 with a connected structure, such as being divided into multiple parts, may also be used. The material from which the water collection pipe 5 is made is not particularly limited, but a thermosetting resin or a thermoplastic resin is used.

[0039] (Permeate side channel material) When RO or NF membranes are used in applications such as seawater desalination and wastewater treatment, the permeate-side channel material 3 is disposed between opposing separation membranes 1 in the membrane leaf L, as shown in Fig. 1B. This permeate-side channel material is required to support the pressure applied to the membrane from the backside and to ensure a channel for the permeate.

[0040] Examples of constituent threads of the permeate-side channel material 3 include polyesters such as polyethylene terephthalate and polyethylene naphthalate, and polyolefins such as polyethylene and polypropylene. Among these, polyethylene terephthalate is particularly preferred from the viewpoints of processability and productivity. When resin reinforcement is performed after knitting, methods include impregnating the fibers with resin and curing it, or coating the fiber surface with resin and curing it. Examples of resins used for reinforcement include melamine resin and epoxy resin.

[0041] The thickness of the permeate-side channel material is preferably 0.10 to 0.40 mm, more preferably 0.15 to 0.35 mm, and even more preferably 0.20 to 0.30 mm. When the thickness is 0.10 mm or more, sufficient channels are secured, and the pressure loss of the permeate can be reduced. When the thickness is 0.40 mm or less, the effective membrane area of ​​the separation membrane in the membrane element increases, making it easier to increase the flow rate of the permeate.

[0042] (separation membrane) Although various porous membranes can be used as the separation membrane 1, a composite semipermeable membrane having a separation functional layer on the surface of a porous support is preferred. The porous support preferably has a polymer porous layer on one side of a nonwoven fabric layer. The thickness of the separation membrane, particularly the composite semipermeable membrane, is preferably about 70 to 160 μm, more preferably 85 to 130 μm.

[0043] These composite semipermeable membranes are called RO (reverse osmosis) membranes, NF (nanofiltration) membranes, or FO (forward osmosis) membranes depending on their filtration performance and treatment method, and can be used for producing ultrapure water, desalination of seawater, desalination of brackish water, and recycling of wastewater.

[0044] Examples of the separation functional layer include polyamide-based, cellulose-based, polyether-based, and silicone-based separation functional layers, but polyamide-based separation functional layers are preferred. Polyamide-based separation functional layers are generally homogeneous membranes without visible pores and have the desired ion separation ability. This separation functional layer is not particularly limited as long as it is a polyamide-based thin film that is difficult to peel off from the polymer porous layer. For example, a polyamide-based separation functional layer formed by interfacially polymerizing a polyfunctional amine component and a polyfunctional acid halide component on a porous support membrane is well known.

[0045] The method for forming the polyamide-based separation functional layer on the surface of the polymer porous layer is not particularly limited, and any known method can be used.For example, methods such as interfacial polymerization, phase separation, and thin film coating can be mentioned, but in the present invention, interfacial polymerization is particularly preferably used.The interfacial polymerization method is, for example, a method in which the polymer porous layer is coated with an amine aqueous solution containing a polyfunctional amine component, and then the surface coated with the amine aqueous solution is brought into contact with an organic solution containing a polyfunctional acid halide component, thereby causing interfacial polymerization and forming a skin layer.

[0046] The exposed surface of the separation functional layer may be provided with a coating layer made of various polymer components. The polymer components are not particularly limited as long as they do not dissolve the separation functional layer or the porous support membrane and are not eluted during water treatment, and examples thereof include polyvinyl alcohol, polyvinylpyrrolidone, hydroxypropyl cellulose, polyethylene glycol, and saponified polyethylene-vinyl acetate copolymer.

[0047] The nonwoven fabric layer is not particularly limited as long as it maintains the separation and permeation performance of the composite semipermeable membrane while imparting appropriate mechanical strength, and commercially available nonwoven fabrics can be used. Examples of materials that can be used include those made of polyolefin, polyester, cellulose, etc., and mixtures of multiple materials can also be used.

[0048] (exterior materials) The exterior material 20 is formed by applying, for example, fiber reinforced plastic (FRP) having reinforcing fibers to the outer periphery of the wound body R.

[0049] (Downstream end 131 and upstream end 130: anti-telescope material) The anti-telescope material 131 has a disk-shaped main body 1311 provided at the end of the membrane element E. The disk-shaped main body 1311 has an outer diameter that is approximately the same as the inner diameter of the vessel 110, and can prevent the water collection pipe 5 from becoming eccentric due to gravity and causing the supply-side flow path to become non-uniform.

[0050] FIG. 1B(b) shows an example of an anti-telescopic member 131. The anti-telescopic member 131 has a central annular portion 131c with an inner circumferential surface into which the water collection pipe 5 can be fitted, and ribs 131b extending radially from the central annular portion 131c. While the number of ribs 131b is not particularly limited, 4 to 20 is preferred, and 6 to 16 is more preferred, from the viewpoint of ensuring sufficient flow path and strength while suppressing telescoping. The concentrated liquid holes 131a are provided in the main body 1311 around the central annular portion 131c and are holes for passing the concentrated liquid. The outer ring of the anti-telescopic member 131 also has an outer annular rib 131d that is the same height as the central annular portion 131c and ribs 131b. In this embodiment, the concentrated liquid holes 131a are formed in a recess in the main body 1311 of the anti-telescopic member 131, and the central annular portion 131c, ribs 131b, and outer annular rib 131d are flush with each other in a side view.

[0051] The ribs 131b may be, for example, continuous or intermittent linear, radial, curved, or spiral ribs extending from the central annular portion 131c toward the outer diameter of the main body 1311. The disk-shaped outer annular rib 131d may be continuous or intermittent. The contact points between each rib and the thrust load support portions 150 and 151 (described later) may be points, lines, or surfaces, with surfaces being preferred.

[0052] The upstream end 130 has the same configuration as the anti-telescope material. At least the central annular portion 131c and the outer annular rib 131d of the anti-telescope material on the downstream side of the adjacent membrane element E come into contact with the central annular portion 131c and the outer annular rib 131d of the anti-telescope material on the upstream side, thereby preventing the wound body R from deforming into a telescopic shape. On the other hand, the most downstream anti-telescope member suppresses deformation with thrust load support portions 150 and 151, which will be described below.

[0053] (Thrust load support part) 1A is connected to the outlet adapter 123, abuts against the anti-telescope material 131 of the membrane element E on the most outlet side, and supports the thrust load. The thrust load support part 150 extends parallel to the diameter of the anti-telescope material 131, which is the end part of the membrane element E on the most outlet side, from the outlet adapter 123, and abuts against at least a part of each rib 131b and the central annular part 131c of the anti-telescope material 131.

[0054] The thrust load support portion 150 has a central through-hole 150c into which the upstream portion of the outlet adaptor 123 fits. The thrust load support portion 150 and the outlet adaptor 123 may be separate components that are combined together, or may be physically integrated. In another embodiment, the thrust load support portion 150 may be an extension of the outlet adaptor 123.

[0055] The thrust load support portion 150 may be, for example, a polygonal plate, a disk, a cross plate, or a star plate. The thrust load support portion 150 shown in FIGS. 2(a) and 2(b) is disk-shaped, and its outer diameter (D_s) is smaller than 8 inches. If the outer diameter (D_s) of the disk is too small, it becomes difficult to adequately support the membrane element end portion. If it is too large, the concentrated liquid flow path at the membrane element end portion is blocked, resulting in increased pressure loss. Therefore, the outer diameter (D_s) of the thrust load support portion 150 is preferably in the range of a maximum diameter of φ125 mm or more and φ160 mm or less. The thrust load support portion 150 in FIGS. 1A and 2 does not have a liquid passage hole for the concentrated liquid. In another embodiment, the thrust load support portion 150 may have a liquid passage hole.

[0056] The thrust load acting on the membrane element is, for example, approximately 13 kN in the case of an 8-inch vessel, and the thrust load support portion 150 must have the strength to withstand this load. Therefore, when the thrust load support portion 150 is made of a metal material, its thickness (t) is preferably 5 mm or more. An example of the metal material is stainless steel.

[0057] When the thrust load supporting portion 150 is made of a resin material, its thickness (t) is preferably 10 mm or more. Examples of resin materials include ABS resin, vinyl chloride resin, and modified PPE resin.

[0058] When the thrust load support portion 150 is disk-shaped, it may have a thickness distribution in the radial direction. If a distribution is provided, it is preferable that the average thickness is equal to or greater than the above-mentioned dimensions. It is preferable that the corners of the outermost diameter portion of the disk are rounded. This has the effect of smoothing the flow of processing liquid. It also has the effect of mitigating stress concentration that occurs at the contact point between the thrust load support portion 150 and the rib 131b or outer annular rib 131d of the anti-telescope member 131.

[0059] The thrust load support portion 150 is connected in a direction perpendicular to the longitudinal direction of the outlet adapter 123, and the thrust load support portion 150 abuts against the rib 131b and central annular portion 131c of the anti-telescope member 131. The contact area between the thrust load support portion 150 and the rib 131b and central annular portion 131c may be 20% or more, 30% or more, 40% or more, 50% or more, 60% or more, 70% or more, 80% or more, 90% or more, or 100% of the axial projected area of ​​the thrust load support portion 150. The larger the contact area, the more preferably it is necessary to form a passage hole for the concentrated liquid in the thrust load support portion 150 and ensure a flow path for the concentrated liquid.

[0060] The thrust load support part 150 may have a single layer structure or a two or more layer structure. For example, in the case of a two layer structure, the first layer in contact with the end of the membrane element may have the above-mentioned disk shape, and the second layer may have a disk shape with an outer diameter smaller than that of the disk shape of the first layer.

[0061] (Embodiment 2: Thrust load support portion 151) FIG. 3 shows the thrust load support portion 151 of the second embodiment. The thrust load support portion 151 is disk-shaped and abuts against the outer annular rib 131d of the anti-telescopic member 131. The thrust load support portion 151 is provided with a liquid passage hole 151a for passing the concentrated liquid discharged from the concentrated liquid hole 131a of the anti-telescopic member 131. The thrust load support portion 151 has a central through-hole 151c into which the upstream portion of the outlet adaptor 123 fits. The thrust load support portion 151 and the outlet adaptor 123 may be configured as separate bodies combined together, or may be configured as a physically integrated body. In another embodiment, the thrust load support portion 151 may be extended from the outlet adaptor 123.

[0062] FIG. 4 shows examples of fluid passage holes in the thrust load support portion 151. FIG. 4(a) shows an example of a circular fluid passage hole 151a, FIG. 4(b) shows an example of a two-stage narrow fan-shaped fluid passage hole 151b, and FIG. 4(c) shows an example of a fan-shaped fluid passage hole 151d. When a center line is drawn at the central through-hole 151c, an outermost diameter line is drawn at the outermost diameter of the thrust load support portion 151, and a 1 / 2 radial line is drawn midway between the center line and the outermost diameter line, each fluid passage hole is located closer to the outermost diameter line than the center line based on the 1 / 2 radial line. Furthermore, it is preferable that the total area of ​​the fluid passage holes on the outermost diameter line side is larger than the total area of ​​the fluid passage holes on the center line side.

[0063] When the entire radial end of the thrust load support portion 151 abuts against the outer annular rib 131d of the anti-telescopic member 131, the total area of ​​the fluid passage holes provided in the thrust load support portion 151 is 10% or more, preferably 14% or more, and more preferably 16% or more of the area corresponding to the inner diameter of the vessel, with the upper limit being 70% or less.

[0064] (Other devices) The spiral membrane module 100 is configured to be operated under desired conditions by adding other devices such as pumps, sensors, tanks, control valves, and control devices as necessary. Also, a line for circulating a part or all of the concentrated liquid to the feed liquid may be provided. [Explanation of symbols]

[0065] 100 Spiral-wound membrane module 110 Vessel 111 Feed liquid inlet port 112 Permeate outlet port 113 Concentrate outlet port 121 Inlet adapter 122 Interconnector 123 Outlet Adapter 130, 131 Anti-telescope material 150, 151 Thrust load support part E Spiral membrane element

Claims

1. A spiral-wound membrane module having a spiral-wound membrane element therein, a vessel having a feed inlet port and a concentrate outlet port, which may be end or side ports, and a permeate outlet port; one or more spiral-wound membrane elements housed in the vessel; an outlet adapter that is connected to the outlet of the water collection pipe of the spiral membrane element on the most outlet side and is connected to the permeate outlet port; a thrust load support portion that extends from the outlet adapter along the radial direction of the membrane element end portion on the most outlet side and abuts against the membrane element end portion to support a thrust load; Equipped with Spiral-type membrane module.

2. When the thrust load supporting portion is made of a metal material, the thickness is 5 mm or more. The spiral membrane module according to claim 1.

3. When the thrust load supporting portion is made of a resin material, the thickness is 10 mm or more. The spiral membrane module according to claim 1.

4. The outer diameter of the thrust load support portion is φ125 mm or more and φ160 mm or less. The spiral membrane module according to claim 1.

5. At least a part or all of the radially outermost end of the thrust load support portion abuts against the outer annular rib at the membrane element end on the most outlet side. The spiral membrane module according to claim 1.

6. The number of fluid passage holes provided in the thrust load support portion is more distal to the center of the thrust load support portion in the radial direction, or the total area of ​​the fluid passage holes on the distal side is larger than the total area of ​​the fluid passage holes on the center side. The spiral membrane module according to claim 1.

7. When the entire radially outermost end of the thrust load support portion abuts against the outer annular rib at the membrane element end on the outermost outlet side, the total area of ​​the liquid passage holes provided in the thrust load support portion is 10% or more of the area corresponding to the inner diameter of the vessel. The spiral membrane module according to claim 1.

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