JP6062672B2 - Spiral membrane module and membrane module unit for water treatment - Google Patents

Description

  The present invention relates to a spiral membrane module and a water treatment membrane module unit, and more particularly to a spiral membrane module having a simple structure and a water treatment membrane module unit having an improved connection structure between the spiral membrane module and a manifold.

  Conventionally, a spiral membrane module using a spiral membrane is known as a membrane module for water treatment. When a large amount of raw water is processed using a spiral membrane module, a plurality of spiral membrane modules are used in accordance with the processing amount.

  In recent years, attempts have been made to remove microorganisms in ship ballast water by membrane treatment. When ballast water is processed by the spiral membrane module, it is necessary to process a huge amount of ballast water in a short time. In particular, in a huge ship such as a tanker, the capacity of the ballast tank becomes huge, and therefore it is necessary to provide a huge number of spiral membrane modules in the ship.

  For this reason, the applicant of the present application has a structure in which a plurality of spiral membrane modules are connected to the manifold constituting the flow path of the raw water, so that even if a large number of spiral membrane modules are used, the overall configuration is compact. The membrane module unit for water treatment which can be performed is proposed (patent document 1).

  The spiral membrane module has a structure in which a spiral membrane in which a plurality of envelope-like membranes are wound around the outer periphery of a water collecting pipe is accommodated inside an outer container, and the end of the plurality of spiral membrane modules is connected to one manifold. By connecting them so that raw water can flow in and out, one water treatment membrane module unit is configured.

  FIG. 9 shows a cross-sectional view of the main part of the membrane module unit for water treatment. In the figure, 100 is a spiral membrane module, 200 is a first manifold connected to one end of the spiral membrane module 100, and 300 is a second manifold connected to the other end of the spiral membrane module 100.

  The spiral membrane module 100 has a spiral membrane in which a plurality of envelope-like membranes 102 are wound around a water collecting tube 103 having one end closed and only the other end opened. It is accommodated in the exterior container 101 so as to coincide with the length direction of the exterior container 101.

  The first manifold 200 has a ballast raw water chamber 201 common to a plurality of spiral membrane modules 100 inside, a raw water inlet 202 through which ballast raw water is introduced to the wall surface, and an outer container 101 of the spiral membrane module 100. A plurality of attachment openings 203 for connecting one end are formed.

  The second manifold 300 has a cleaning drainage chamber 301 common to the plurality of spiral membrane modules 100 and a ballast processing water chamber 302 common to the plurality of spiral membrane modules 100. And have. The open end of the water collecting pipe 103 of each spiral membrane module 100 is connected to the ballast processing water chamber 302. On the wall surface, a treated water discharge port 303 for discharging the ballast treated water in the ballast treated water chamber 302, a drainage outlet 304 for discharging the drained liquid in the cleaning drainage chamber 301, and the outer casing 101 of the spiral membrane module 100 A plurality of attachment openings 305 are formed for connecting the other ends.

  The connecting portion between the first manifold 200 and the second manifold 300 and the synthetic resin film 101 of the spiral membrane module 100 is fitted through a seal member such as an O-ring, and is fixed by an adhesive, for example. A bolt (not shown) is bridged over the 200 and the second manifold 300 so as to be connected.

  According to such a membrane module unit for water treatment, it is possible to perform membrane treatment of a large amount of raw water in parallel by appropriately increasing the number of units according to the amount of treatment, which is extremely efficient and saves space. It has a number of advantages such as

JP 2011-92824 A

  Since the outer casing of the spiral membrane module needs to have a pressure resistance sufficient to withstand the inflow pressure of the raw water, a pressure resistant container (vessel) made of metal such as stainless steel is generally used. For this reason, there is a problem that the weight of the spiral membrane module alone is increased and the weight of the entire unit is increased. The increase in the weight of the unit is a serious problem, especially when the unit is mounted on a cargo ship, which leads to a decrease in the load.

  Further, since the weight of the spiral membrane module alone is increased, there is a problem at the time of assembling the unit or replacing the spiral membrane module. That is, when the unit is installed in a narrow space such as in a ship, it is often difficult to lift the spiral membrane module by using a machine, and in addition to being forced to work manually, the work space However, there is a problem that the assembly work of the unit and the replacement work of the spiral membrane module are extremely laborious.

  In view of this, the present inventor has examined the formation of an exterior container using a synthetic resin in order to simplify and reduce the weight of the structure of such a conventional spiral membrane module. However, it is difficult to manage the dimensions of the outer casing made of synthetic resin, and there is a problem that the length dimensions may not match between the spiral membrane modules connected between the manifolds. Since the distance between the manifolds and the opening diameter of the mounting opening of the spiral membrane module are constant, if the length of the outer container varies, the connection state with the manifold varies for each spiral membrane module.

  Further, when the unit is installed in the ship, the installation location is often in the vicinity of the engine room near the ship bottom due to the space, and the spiral membrane module is affected by the heat from the engine room. For this reason, when the exterior container is made of a synthetic resin, there is a problem that expansion and contraction in the length direction occurs. The influence of this heat is not necessarily the same for each spiral membrane module in the unit, and may differ for each spiral membrane module near and far from the engine room and outside and inside the unit. For this reason, expansion and contraction due to the influence of heat is added to the variation in the length dimension of the outer container, so that the entire unit may be deformed, and water leakage may occur from the connection site.

  The present invention has been made in view of such a conventional situation, and a first object is to provide a spiral membrane module that can be simplified and lightened by eliminating an exterior container.

  In addition, the second problem of the present invention is that a plurality of simple and lightweight spiral membrane modules having no exterior container are used, the dimensional accuracy management can be simplified, and the entire unit is deformed by the influence of heat. It is an object of the present invention to provide a membrane module unit for water treatment that can stably maintain a connection state between a manifold and a spiral membrane module over a long period of time.

  Other problems of the present invention will become apparent from the following description.

  The above problems are solved by the following inventions.

(Claim 1)
A water collecting pipe, a plurality of envelope membranes wound around the outer circumference of the water collection tube and communicating with the inside of the water collection tube, and a reinforcing fiber wound from above the envelope membrane in the wound state A spiral membrane module having a synthetic resin coating formed by being coated and impregnated and solidified with a synthetic resin;
A connecting tubular body connected to each end of the synthetic resin coating of the spiral membrane module;
A first manifold connected to the connecting tubular body on one end side of the spiral membrane module, having a raw water introduction port, and flowing raw water into a raw water flow path between the envelope membranes;
A treatment water chamber connected to the connection tubular body on the other end side of the spiral membrane module, having a treated water discharge port and a drainage discharge port; A second manifold that is partitioned into a cleaning drain chamber into which cleaning drainage flows from the raw water flow path between the envelope-shaped membranes;
With
The water collecting pipe has a closed end on the first manifold side and an open end on the second manifold side,
The connecting tubular body includes a tubular body main body fixed to the synthetic resin film, and a support ring that supports the end of the water collecting pipe of the spiral membrane module through the inside of the tubular body main body. And the cylindrical body main body and the support ring portion are connected to each other and contact with the end face of the enveloped membrane in the spiral state in the spiral membrane module, thereby preventing axial displacement of the enveloped membrane. An axial displacement prevention portion ,
The closed end portion and the open end portion of the water collecting pipe are respectively inserted through the support ring portions,
A membrane module unit for water treatment, wherein the open end is connected to a treated water chamber defined in the second manifold .

(Claim 2)
Said first and second manifold, cylinder, wherein an opening to be connected to the spiral membrane module, projects at a predetermined height so as to surround the outer periphery of the connecting tubular body to the opening and concentric A flange-shaped part,
2. The water treatment according to claim 1, wherein a space between an outer peripheral surface of the connecting tubular body protruding from the synthetic resin coating and an inner peripheral surface of the cylindrical flange portion is sealed by a sealing member. Membrane module unit.

(Claim 3 )
Water treatment membrane module unit according to claim 1 or 2, wherein said raw water is a ship ballast water.

  According to the spiral membrane module according to the present invention, it is possible to provide a spiral membrane module capable of simplifying the structure and reducing the weight by eliminating the exterior container.

  Moreover, according to the membrane module unit for water treatment according to the present invention, it is possible to use a plurality of simple and lightweight spiral membrane modules having no outer container, simplify the dimensional accuracy management, and reduce the deformation of the entire unit. It does not occur, and the connection state between the manifold and the spiral membrane module can be stably maintained over a long period of time.

The perspective view which shows the spiral membrane module which concerns on this invention partially fractured | disassembled and shows The perspective view explaining a mode that a synthetic resin film is formed in a spiral film Perspective view of membrane module unit for water treatment Partial perspective view which shows the state which attached the cylindrical body for connection to the closed end part side of the water collection pipe | tube in a spiral membrane module (A) is a front view of a connecting tubular body, (b) is a side view. Sectional drawing which shows the connection part of a spiral membrane module and a 1st manifold Sectional drawing which shows the connection part of a spiral membrane module and a 2nd manifold The figure explaining an example of the method of the ballast water treatment using the membrane unit for water treatment concerning the present invention Sectional view of a conventional membrane module unit for water treatment

  Hereinafter, modes for carrying out the present invention will be described.

  FIG. 1 is a perspective view showing a spiral membrane module (hereinafter simply referred to as a membrane module) according to the present invention in a partially broken and exploded manner.

  The membrane module 2 is composed of a spiral membrane 20 in which a large number of envelope-like membranes 22 are wound around the outer periphery of a water collecting pipe 21 that collects treated water, and a synthetic coating that is integrally formed on the outer circumference of the envelope-like membrane 22 in a wound state. And a resin coating 26.

  The water collecting pipe 21 is formed by a straight pipe having a closed end portion 21a whose one end is closed and an open end portion 21b which is opened to discharge the treated water at the other end.

  In each envelope-like film 22, there is provided a transmission side spacer 23 that maintains the stretched state of the envelope-like film 22 and forms a space for treated water that has permeated inside the envelope-like film 22. . The inside of the envelope-shaped membrane 22 communicates with the inside of the water collection tube 21 so that treated water that has permeated through the envelope-shaped membrane 22 can be transferred into the water collection tube 21.

  Each envelope film 22 is radially attached to the outer peripheral surface of the water collecting pipe 21. Between the adjacent envelope-shaped membranes 22, the envelope-shaped membranes 22 are in close contact with each other to prevent the membrane area from becoming narrower, and between the water collecting pipe 21 and the synthetic resin coating 26, the adjacent envelope-shaped membranes 22. A raw water spacer 25 for forming the raw water flow path 24 is inserted therebetween. A large number of envelope-like membranes 22 having a permeate-side spacer 23 and a large number of raw water spacers 25 between the envelope-like membranes 22 are wound around the outer circumference of the water collecting pipe 21 and wound with high density. Thus, a spiral membrane 20 having a substantially cylindrical shape with the water collecting pipe 21 as an axis is formed as a whole.

  The permeation side spacer 23 in the envelope-like film 22 and the raw water spacer 25 between the envelope-like film 22 are also wound together with the envelope-like film 22 in the present invention. 22, when the permeation-side spacer 23 and the raw water spacer 25 are referred to as being wound together around the outer periphery of the water collecting pipe 21, it is simply referred to as an envelope-like membrane 22 in a wound state. That is, in the present invention, when the envelope-like membrane 22 is in a wound state, the permeation-side spacer 23 and the raw water spacer 25 are included in addition to the envelope-like membrane 22.

  The synthetic resin film 26 is an FRP film integrally formed on the outer periphery of the wound envelope-like film 22 by impregnating the reinforcing fiber with the synthetic resin, and is reinforced by the reinforcing fiber 26a. Thus, rigidity and strength are imparted to the entire membrane module 2. Here, being integrally formed means that the synthetic resin of the synthetic resin film 26 and the outer peripheral surface of the wound envelope-like film 22 are in close contact with each other and integrated with the solidified synthetic resin. Say.

  As shown in FIG. 2, the synthetic resin coating 26 is formed by winding the reinforcing fiber 26a from above the enveloped membrane 22 in a wound state, and the synthetic resin (not shown) is wound around the wound reinforcing fiber 26a. Can be formed by applying and impregnating and solidifying the synthetic resin. The application and impregnation operations of the reinforcing fiber 26a and the synthetic resin are repeated a plurality of times so that the synthetic resin film 26 has a predetermined thickness and strength.

  The synthetic resin film 26 is formed by impregnating the reinforcing fiber 26a with the synthetic resin in this way, so that the synthetic resin film 26 is formed with at least a part of the outer peripheral surface of the envelope film 22 in the wound state. The resin is fixed and integrated. The portion of the envelope film 22 fixedly integrated with the synthetic resin film 26 cannot function as a film, but the portion in contact with the synthetic resin film 26 is a very small part of the tip of each envelope film 22. Therefore, the film processing is not substantially affected.

  Examples of the reinforcing fiber 26a include glass fiber, carbon fiber, and aramid fiber. These fibers are long striates, and may be wound around the outer periphery of the wound envelope-like film 22 in the form of the long striates, or formed using the striates. You may make it the form of cloth-like fibers, such as a woven fabric or a nonwoven fabric, and wind the cloth-like fiber around the outer periphery of the envelope-shaped film | membrane 22 of a wound state. FIG. 2 shows an example in which a strip-like cloth fiber is wound as the reinforcing fiber 26a.

  As the synthetic resin for forming the synthetic resin film 26, a thermosetting resin is generally used. Specific examples include an epoxy resin, a polyamide resin, and a phenol resin.

  According to this membrane module 2, since the rigidity and strength can be secured by the synthetic resin coating 26 reinforced by the reinforcing fiber 26a without using a conventional outer container as a pressure-resistant container, the conventional outer container is unnecessary. The structure can be simplified, and the outer packaging is unnecessary, so that the membrane module 2 can be reduced in weight and cost. In general, when processing ship ballast water, the number of membrane modules 2 installed is extremely large, so that the membrane module unit that is an assembly of membrane modules 2 is reduced by reducing the weight per membrane module 2. 1 and further, the weight of the entire ballast water treatment apparatus, which is an assembly of the membrane module unit 1, can be greatly reduced. In particular, when the ship is a cargo handling ship such as a container ship, it is possible to mount more loads by reducing the weight of the entire ballast water treatment apparatus.

  The synthetic resin coating 26 covers and protects the outer periphery of the wound envelope-like membrane 22 in the spiral membrane 20 in place of the conventional outer packaging as a pressure vessel. Strength is secured. The thickness of the synthetic resin film 26 is preferably 5 mm to 20 mm, although it depends on the outer diameter of the spiral film 20.

  Since the synthetic resin film 26 has such a thickness, the rigidity and strength of the entire membrane module 2 can be ensured without an outer container, the raw water flow path 24 is not deformed, and a smooth raw water flow can be ensured. In addition to the effect, since constant water flows through all the membrane modules 2, the degradation of the membrane becomes uniform, the life of the entire membrane module 2 can be extended, and workability when replacing the membrane module 2 Can also be improved.

  FIG. 3 is a perspective view of one water treatment membrane module unit configured by using a plurality of such membrane modules 2.

  The water treatment membrane module unit 1 (hereinafter simply referred to as “unit 1”) includes a plurality of membrane modules 2 and two manifolds including a first manifold 3 and a second manifold 4 common to the plurality of membrane modules 2. And have.

  Two or more membrane modules 2 may be arranged in parallel between the first manifold 3 and the second manifold 4. Although the number is not necessarily limited, Preferably it is the range of 3-20, More preferably, it is 4-15, More preferably, it is 5-10. In this embodiment, six membrane modules 2 are arranged side by side.

  The first manifold 3 has a raw water chamber common to the plurality of membrane modules 2 inside. On the other hand, the second manifold 4 has a cleaning drainage chamber (raw water concentrate chamber) common to the plurality of membrane modules 2 and a processing common to the plurality of membrane modules 2. And a water chamber. In FIG. 3, 31 is a raw water inlet provided in the first manifold 3, and communicates with the raw water chamber in the first manifold 3. A treated water discharge port 41 is provided in the second manifold 4 and communicates with the treated water chamber. Reference numeral 42 denotes a drainage discharge port which communicates with the cleaning drainage chamber.

  In the present embodiment, the internal configurations of the first manifold 3 and the second manifold 4 are the same as those of the conventional first manifold 200 and the second manifold 300 shown in FIG.

  Next, a connection structure between the membrane module 2 and the first manifold 3 and the second manifold 4 will be described with reference to FIGS.

  4 is a partial perspective view showing a state in which a connecting tubular body is provided at the end of the membrane module 2, FIG. 5 shows a structure of the connecting tubular body, (a) is a front view, b) is a side view, FIG. 6 is a cross-sectional view showing a connection portion between the membrane module 2 and the first manifold 3, and FIG. 7 is a cross-sectional view showing a connection portion between the membrane module 2 and the second manifold 4.

  The connecting tubular body 5 is formed of metal, synthetic resin, a composite material of metal and synthetic resin, FRP or the like, and a plurality of flange portions 52, 53, 54 a on the outer periphery of the cylindrical tubular body 51. 54b project from each other at a predetermined interval. The cylindrical main body 51 protrudes to the left side of the figure from the flange portion 52 shown in FIG. 5B, and the protruding portions are for attaching the membrane modules provided on the first manifold 3 and the second manifold 4, respectively. It is set as the connection part 51a fitted with the opening parts 32 and 43. FIG.

  Further, the cylindrical body 51 protrudes further to the right side of the drawing than the flange portion 53 shown in FIG. 5B, and a portion protruding from the flange portion 53 is an end of the synthetic resin coating 26 of the membrane module 2. It is set as the connection part 51b connected with a part.

  The outer diameter of one connecting portion 51a of the cylindrical body 51 is the same as or slightly smaller than the inner diameter of the membrane module mounting openings 32 and 43 provided in the first manifold 3 and the second manifold 4, respectively. The outer diameter of the other connecting portion 51b is formed to be approximately the same as the outer diameter of the envelope film 22 in the wound state. Accordingly, the outer diameters of the flange portions 54a and 54b protruding from the outer peripheral surface of the connection portion 51b are formed to be slightly larger than the outer diameter of the envelope-like film 22 in the wound state.

  The outer diameters of the flange portions 54a and 54b are formed to be slightly smaller than the outer diameters of the flange portions 52 and 53. In the present embodiment, the outer diameters of the flange portions 52 and 53 are the same as or larger than the outer diameter of the synthetic resin coating 26.

  An annular support ring 56 is disposed inside the tubular body 51 to support the end portion of the water collecting pipe 21 of the membrane module 2 inserted therein. The outer peripheral surface of the support ring 56 and the tubular body are disposed. The inner peripheral surface of the main body 51 is connected by a plurality of connecting arms 57 extending radially. With this connecting arm 57, the support ring portion 56 is located concentrically with the tubular body main body 51 in the center of the connecting tubular body 5. The inner diameter of the support ring portion 56 is substantially the same as the outer diameter of the water collecting pipe 21 of the membrane module 2.

  In the present embodiment, six connecting arms 57 are provided in a radial pattern, but there may be a plurality of connecting arms 57 and is not particularly limited. Moreover, it is not restricted to what is formed linearly between the cylindrical body main body 51 and the support ring part 56, You may form in curvilinear form.

  This connecting tubular body 5 has a support ring portion 56 fitted to the outer periphery of the water collecting pipe 21 and a connecting portion 51b of the tubular body main body 51 with respect to the spiral membrane 20 before the synthetic resin coating 26 is formed. The end surfaces on the side are abutted against the end surfaces of the envelope-like film 22 in the wound state, and are respectively disposed at both ends of the envelope-like film 22 in the wound state. At this time, each connecting arm 57 also comes into contact with the end face of the envelope-like film 22 in the wound state.

  In this state, as described above, the reinforcing fiber extends over the connecting portion 51b inside the flange portions 53 of the connecting tubular body 5 at both ends and the outer periphery of the enveloped membrane 22 in the wound state. The synthetic resin film 26 is integrally formed by winding 26a and impregnating the synthetic resin and solidifying the synthetic resin. The end portions of the synthetic resin coating 26 are firmly fixed and integrated with the connecting tubular body 5 by biting into groove portions formed between the flange portions 53, 54a and 54b of the connecting tubular body 5, respectively. The watertight state.

  Thereby, each connecting tubular body 5 and the membrane module 2 are integrated. The membrane module 2 has one closed end 21a of the water collecting pipe 21 inserted into the support ring 56 as shown in FIG. 6, and the other open end 21b as shown in FIG. By being inserted into the portion 56, both ends are supported by the connecting tubular body 5. In each membrane module 2, the tubular body 51 of the connecting tubular body 5 on the closed end 21 a side of the water collection pipe 21 is fitted to the opening 32 of the first manifold 3, so that the open end of the water collection pipe 21. Since the tubular body 51 of the connecting tubular body 5 on the side of the portion 21b is fitted and connected to the opening 43 of the second manifold 4, a direct load is applied to the synthetic resin coating 26. Never give.

  Since the end surface on the envelope film 22 side of the tubular body 51 and the end surface on the envelope film 22 side of the connecting arm 57 are formed to be flush with each other, each connecting arm 57 is in a wound state. It abuts against the end face of the envelope-shaped film 22 along the radial direction. Due to the contact of the connecting arm 57, the rolled envelope film 22 is prevented from shifting in the axial direction (left-right direction shown in FIGS. 6 and 7) (telescope phenomenon). Accordingly, the connecting arm 57 functions as an axial displacement preventing portion of the envelope-shaped film 22. The connecting tubular body 5 also serves as an axial displacement preventing member (ATD) for preventing the axial displacement of the envelope-shaped film 22. For this reason, it is not necessary to separately provide an axial displacement preventing member in addition to a member for connection to the first manifold 3 and the second manifold 4, and the number of parts is reduced, thereby reducing the size, weight, and weight. Cost can be reduced.

  As shown in FIG. 6, the connection between the membrane module 2 and the first manifold 3 each having the connecting tubular body 5 attached to both end portions thereof is performed in the tubular body 51 of the connecting tubular body 5 as shown in FIG. The connection portion 51a is attached in the opening portion 32 of the first manifold 3 in a simple fitting state without being bonded or screwed. As a result, the inside of the first manifold 3 (raw water chamber) and the inside of the membrane module 2 (raw water flow path 24) communicate with each other through the adjacent connecting arms 57, 57, and the membrane module 2 from the first manifold 3 is communicated. Inflow of raw water becomes possible.

  Further, as shown in FIG. 7, the connection between the membrane module 2 and the second manifold 4 is made by connecting the connecting portion 51 a in the cylindrical body 51 of the connecting cylindrical body 5 into the opening 43 of the second manifold 4. It is performed by attaching in a simple fitting state without bonding or screwing. Thereafter, bolts (not shown) are bridged between the first manifold 3 and the second manifold 4, so that a plurality of membrane modules 2 are held between them. As a result, the inside of the second manifold 4 (cleaning drainage chamber) and the inside of the membrane module 2 (raw water flow path 24) communicate with each other through the adjacent connecting arms 57, 57, and the second from the membrane module 2. The raw water can flow out to the manifold 4. Further, the open end 21 b of the water collecting pipe 21 of the membrane module 2 is connected to a treated water chamber partitioned in the second manifold 4, so that treated water can be discharged into the treated water chamber.

  Thus, since the membrane module 2 is connected to the first manifold 3 and the second manifold 4 via the connecting tubular body 5, the unit 1 has a pressure resistance of each membrane module such as a conventional unit. The outer container as a container is eliminated, and the overall configuration of the unit 1 is simplified, and the weight and cost can be reduced.

  Further, the load of the membrane module 2 can be received by the tubular body 51 (connecting portion 51a) of the connecting tubular body 5, and the first manifold is not concentrated on the synthetic resin coating 26 of the membrane module 2 at all. 3 and the second manifold 4 can be connected. Thereby, the connection state between the membrane module 2 and the 1st manifold 3 and the 2nd manifold 4 can be maintained stably over a long period of time.

  Furthermore, even if the synthetic resin coating 26 for each membrane module 2 varies in length, it can be absorbed by the degree of penetration into the openings 32 and 43 of the connecting portion 51a of the connecting tubular body 5. . Even if the outer diameter of the synthetic resin coating 26 varies among the membrane modules 2, the synthetic resin coating 26 is not directly connected to the first manifold 3 and the second manifold 4, so that the membrane module 2 and the first manifold 3 are not connected. And the connection state between the second manifold 4 is not affected. Thereby, the dimensional accuracy management of the membrane module 2 can be simplified.

  Moreover, even if the length of the synthetic resin film 26 expands or contracts due to the influence of heat, the connection part 51a of the connection tubular body 5 can be absorbed by moving in the openings 32 and 43 in the axial direction. The entire unit 1 is not deformed.

  Thus, in order to allow the connecting portion 51a of the tubular body 51 to move preferably in the axial direction within the openings 32 and 43, the protruding length A of the connecting portion 51a from the flange portion 52 (FIG. 5B). Is preferably sufficiently larger than the wall thickness B (see FIGS. 6 and 7) of the inner peripheral surfaces of the openings 32 and 43 of the first manifold 3 and the second manifold 4. The connecting part 51a of the cylindrical body 51 is opened so that a gap S is formed between the outer peripheral edge (periphery on the membrane module 2 side) of the opening parts 32 and 43 and the flange part 52 of the connecting cylindrical body 5. Even if the membrane module 2 undergoes large axial expansion and contraction by sufficiently intruding into and fitting into the 32 and 43, the connecting portion 51a of the connecting tubular body 5 passes through the openings 32 and 43 in the axial direction. It can be fully buffered by moving to.

  As shown in FIGS. 6 and 7, the openings 32 and 43 of the first manifold 3 and the second manifold 4 have outer peripheries (flange portions) of the connecting tubular body 5 fitted to the openings 32 and 43. Cylindrical flange portions 33 and 44 projecting at a predetermined height so as to surround the openings 32 and 43 are formed so as to further cover the outer peripheries of 52 and 53. A seal member 6 made of an elastic material such as rubber packing is mounted in a groove portion 55 formed between the flange portions 52 and 53 of the connecting tubular body 5 protruding from the end portion of the synthetic resin coating 26. The seal member 6 seals the space between the outer peripheral surface of the connecting tubular body 5 and the inner peripheral surfaces of the cylindrical flange portions 33 and 44 to provide a watertight state.

  In this way, the cylindrical flange portions 33 and 44 are formed in the first manifold 3 and the second manifold 4, respectively, and the inner cylinder is sealed with the connecting cylindrical body 5, thereby connecting cylinders. There is no need to ensure watertightness between the body 5 and the opening 32 of the first manifold 3 and the opening 43 of the second manifold 4. Since the outer diameters of the flange portions 52 and 53 are the same as or larger than the outer diameter of the synthetic resin coating 26 of the membrane module 2, the cylindrical flange portions 33 and 44 that cover the outer sides of the flange portions 52 and 53 are: The protruding height can be set freely. For this reason, it becomes possible to secure a wide seal area in the axial direction formed by the seal member 6 being crushed, and a more reliable seal can be performed.

  In addition, since the seal member 6 is held between the flange portions 52 and 53 and is prevented from being crushed more than necessary in the axial direction, the seal member 6 is crushed more than an allowable amount and the sealing effect is impaired. That doesn't happen.

  Further, since the cylindrical flange portions 33 and 44 protrude at a predetermined height, the synthetic resin coating 26 expands and contracts in the axial direction, so that the connection portion 51 a of the connection tubular body 5 is located in the openings 32 and 43. When the seal member 6 is moved in the axial direction, the seal member 6 can also slide on the inner peripheral surfaces of the cylindrical flange portions 33 and 44 in the axial direction, and a watertight state can be maintained. In particular, by projecting the cylindrical flange portions 33 and 44 to the extent that they cover the outer side of the synthetic resin coating 26, a reliable watertight state by the seal member 6 can be obtained regardless of the axial direction of the seal member 6. Can be obtained.

  The unit 1 configured as described above is used for various types of water treatment by combining a plurality of units according to the amount of treatment. When the ballast water is processed by this unit 1, a large number of units 1 are combined and mounted in a ship.

  Next, an example of the processing method at the time of comprising the ballast water processing apparatus which processes a ballast water using this unit 1 is shown in FIG.

  The raw water W in this case is generally seawater, is pumped up into the ship by the ballast pump 70, and is supplied into the first manifold 3 of each unit 1 through the raw water suction pipe 71. 71 a is an open / close valve provided in the raw water suction pipe 71.

  The treated water discharge port 41 of the second manifold 4 of each unit 1 is connected to the treated water pipe 72 and communicates with the ballast tank 74 via the treated water pipe 72. 72 a is an on-off valve provided in the treated water pipe 73.

  Further, the drainage discharge port 42 of the second manifold 4 is connected to a raw water outflow pipe (washing drainage discharge pipe) 73, and is discharged to, for example, the sea through the raw water outflow pipe 73. 73 a is an open / close valve provided in the raw water outflow pipe 73.

  In the treatment of ballast water, for example, membrane treatment and membrane cleaning for supplying treated water by supplying raw water W to each unit 1 are alternately performed. In the membrane treatment, the entire amount is filtered by a dead end method. In this method, the open / close valve 73a provided in the raw water outflow pipe 73 is closed, the open / close valve 72a of the treated water pipe 72 is opened, the ballast pump 70 is started, the raw water W is pumped up, and the first manifold 3 of each unit 1 is supplied. This is performed by supplying the whole amount through the raw water flow path 24 (see FIG. 1) of each membrane module 2. The treated water generated by the membrane treatment is sent from the treated water discharge port 41 to the treated water pipe 72 and supplied to the ballast tank 74.

  In addition, when the ballast water is transferred to the ballast tank 74, membrane cleaning by parallel flow of the membrane surface alternately with the above-described total filtration (this cleaning is referred to as cross-flow membrane cleaning; , Sometimes referred to as a cross flow method). In this cross flow method, the open / close valve 73a provided in the raw water outflow pipe 73 is opened, the ballast pump 70 is started, the raw water W is pumped up, supplied to the first manifold 3 of each unit 1, and each membrane module 2 The raw water passage 24 (see FIG. 1) is passed through and discharged from the drainage outlet 42. The raw water W flowing in the membrane module 2 peels off adhered substances on the membrane surface by a flow parallel to the membrane surface of the envelope membrane 22 of the membrane module 2. The raw water (cleaning drainage liquid) containing the discharged adhered substances may be discharged to the sea, for example, via the raw water outflow pipe 73, or the raw water W side (raw water inlet port) into which the cleaning drainage liquid is newly introduced. It is possible to return to 31) and circulate the washing waste liquid as a concentrate.

  At the time of membrane cleaning by the parallel flow on the membrane surface, the on-off valve 72a of the treated water pipe 72 may be opened and the raw water W may be filtered together with the membrane cleaning to obtain treated water, or conversely, the on-off valve 72a is closed. Thus, the treated water may not be obtained.

1: Membrane module unit for water treatment (unit)
2: Spiral membrane module (membrane module)
20: Spiral membrane 21: Water collecting pipe 21a: Closed end portion 21b: Open end portion 22: Envelope-like membrane 23: Permeation side spacer 24: Raw water flow path 25: Raw water spacer 26: Synthetic resin coating 26a: Reinforcing fiber 3: No. 1 Manifold 31: Raw water introduction port 32: Opening portion 4: Second manifold 41: Treated water discharge port 42: Drainage discharge port 43: Opening portion 5: Tubular body for connection 51: Tubular body 51a, 51b: Connection Portions 52, 53, 54a, 54b: flange portion 55: groove portion 56: support ring portion 57: connecting arm 6: seal member S: gap

Claims (3)

A water collecting pipe, a plurality of envelope membranes wound around the outer circumference of the water collection tube and communicating with the inside of the water collection tube, and a reinforcing fiber wound from above the envelope membrane in the wound state A spiral membrane module having a synthetic resin coating formed by being coated and impregnated and solidified with a synthetic resin;
A connecting tubular body connected to each end of the synthetic resin coating of the spiral membrane module;
A first manifold connected to the connecting tubular body on one end side of the spiral membrane module, having a raw water introduction port, and flowing raw water into a raw water flow path between the envelope membranes;
A treatment water chamber connected to the connection tubular body on the other end side of the spiral membrane module, having a treated water discharge port and a drainage discharge port; A second manifold that is partitioned into a cleaning drain chamber into which cleaning drainage flows from the raw water flow path between the envelope-shaped membranes;
With
The water collecting pipe has a closed end on the first manifold side and an open end on the second manifold side,
The connecting tubular body includes a tubular body main body fixed to the synthetic resin film, and a support ring that supports the end of the water collecting pipe of the spiral membrane module through the inside of the tubular body main body. And the cylindrical body main body and the support ring portion are connected to each other and contact with the end face of the enveloped membrane in the spiral state in the spiral membrane module, thereby preventing axial displacement of the enveloped membrane. An axial displacement prevention portion ,
The closed end portion and the open end portion of the water collecting pipe are respectively inserted through the support ring portions,
A membrane module unit for water treatment, wherein the open end is connected to a treated water chamber defined in the second manifold . Said first and second manifold, cylinder, wherein an opening to be connected to the spiral membrane module, projects at a predetermined height so as to surround the outer periphery of the connecting tubular body to the opening and concentric A flange-shaped part,
2. The water treatment according to claim 1, wherein a space between an outer peripheral surface of the connecting tubular body protruding from the synthetic resin coating and an inner peripheral surface of the cylindrical flange portion is sealed by a sealing member. Membrane module unit. 3. The membrane module unit for water treatment according to claim 1, wherein the raw water is ship ballast water.

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