WO2018011899A1

WO2018011899A1 - Membrane separation device

Info

Publication number: WO2018011899A1
Application number: PCT/JP2016/070595
Authority: WO
Inventors: 龍上戸; 櫻井　秀明; 鵜飼　展行; 英夫鈴木; 裕中小路
Original assignee: 三菱重工業株式会社
Priority date: 2016-07-12
Filing date: 2016-07-12
Publication date: 2018-01-18

Abstract

Provided is an osmosis membrane device equipped with: a sealant located between the primary-side protrusion surface of a primary-side main body and a filter membrane; a flat protective member located between the sealant and the filter membrane and extending on a surface of the filter membrane at least from a portion thereof which is in contact with the sealant to the boundary between the primary-side recess surface of the primary-side main body and the primary-side protrusion surface; and an adhesive located between the protective member and the filter membrane.

Description

Membrane separator

The present invention relates to the structure of a membrane separation device for filtering a liquid.

In recent years, various water treatment systems have been proposed as a method for purifying water and a method for producing fresh water from seawater or water containing impurities. As one of the methods, a method called membrane separation has been proposed. According to this method, by allowing a liquid to be filtered to permeate through an osmotic membrane having fine pores with a predetermined pressure, it is possible to separate into water that permeates the membrane and impurities that do not permeate.

For example, according to Patent Document 1, there is disclosed a test apparatus for filtering a fluid using a planar filter membrane disposed between two upper and lower cells.

U.S. Pat. No. 4,846,970

In a method of filtering a fluid using a planar filtration membrane disposed between two upper and lower cells, it is necessary to apply a predetermined pressure to the liquid during filtration. Therefore, it is necessary to firmly fix the filtration membrane by two upper and lower cells so as to withstand this pressure. In such a structure, a fine crushing and a flaw may occur when a load is applied to the filtration membrane from the upper and lower cells. This fine crushing or scratching may cause water leakage or deterioration of the performance of the filtration membrane.

In view of the above circumstances, an object of the present invention is to provide a structure of a membrane separation device that suppresses the occurrence of crushing and scratching of a filtration membrane.

In order to achieve the above object, a membrane separation apparatus for filtering a liquid according to the present invention, as one aspect thereof, is a membrane separation apparatus for filtering a liquid, and a supply liquid in which a supply liquid to be filtered flows A primary side main body having a flow path, a secondary side main body having a permeate flow path through which the filtered permeate flows, and a flat filtration membrane positioned between the primary side main body and the secondary side main body; The primary side main body has an inner surface facing the secondary side main body, and the inner surface is a primary side concave surface defining the supply liquid flow path with the filtration membrane; A primary convex surface surrounding the primary concave surface, the secondary body has an inner surface facing the primary body, and the inner surface is the filtration membrane and the The secondary concave surface defining the permeate flow path and the secondary surrounding the secondary concave surface A convex surface, and further, a sealing material located between the primary convex surface of the primary body and the filtration membrane, and located between the sealing material and the filtration membrane, A flat protective member extending from at least a portion in contact with the sealing material to a boundary between the primary concave surface and the primary convex surface of the primary body on the surface of the filtration membrane, and the protective member And an adhesive positioned between the filter membrane and the filter membrane.

Further, in the membrane separation apparatus for filtering a liquid according to the present invention, the supply liquid channel may be longer than the permeate channel. By doing in this way, the boundary between the primary concave surface and the primary convex surface, and the boundary between the secondary concave surface and the secondary convex surface are at different positions. It will be in contact with the filtration membrane. As a result, since the stress concentration location of the filtration membrane can be dispersed, the generation of scratches and dents in the filtration membrane can be suppressed. The lengths of the supply liquid channel and the permeate channel may be the same.

Moreover, the membrane separation apparatus for filtering a liquid according to the present invention is a membrane separation apparatus for filtering a liquid as another aspect, and has a supply liquid channel through which a supply liquid to be filtered flows. A side main body, a secondary side main body having a permeate flow path through which the filtered permeate flows, and a flat filtration membrane positioned between the primary side main body and the secondary side main body. The primary side body has an inner surface facing the secondary side body, and the inner surface defines a primary side recess surface defining the supply liquid flow path with the filtration membrane, and the primary side recess. A primary convex surface surrounding the surface, and the secondary main body has an inner surface facing the primary main body, and the inner surface connects the permeate flow path with the filtration membrane. The secondary side concave surface to define, and the secondary side convex surface surrounding the secondary side concave surface, The primary side main body is located between the primary convex surface and the filtration membrane, and at least the primary concave surface and the primary convex surface of the primary main body on the surface of the filtration membrane. And an adhesive extending over a portion including the boundary.

Moreover, the membrane separation apparatus for filtering a liquid according to the present invention is a membrane separation apparatus for filtering a liquid as another aspect, and a first supply liquid flow path through which a supply liquid to be filtered flows A first main body having a second main body having a second supply liquid flow path through which a supply liquid to be filtered flows, and two sheets positioned between the first main body and the second main body A flat filtration membrane and a flat permeation spacer positioned between the two flat filtration membranes, wherein the first main body is located on the inner side facing the second main body. A first recess surface defining a first supply liquid flow path with a first filtration membrane located on a first main body side of the two filtration membranes. And a first convex surface surrounding the first concave surface, and the second main body is opposed to the first main body. A second recess surface defining a second permeate flow path with a second filtration membrane located on the second main body side of the two filtration membranes And a second convex surface surrounding the second concave surface, and a second convex surface located between the first convex surface of the first main body and the first filtration membrane. One sealing material, a second sealing material positioned between the second convex surface of the second main body and the second filtration membrane, the first sealing material, and the first sealing material. The first concave surface of the first main body and the first convex portion from at least a portion in contact with the first sealing material on the surface of the first filtration membrane, which is located between the first membrane and the membrane. A flat first protective member extending up to the boundary with the surface, located between the second sealing material and the second filtration membrane, A flat first surface extending from at least a portion in contact with the second sealing material to a boundary between the surface of the second concave portion and the surface of the second convex portion of the second main body. Two protective members, a first adhesive positioned between the first protective member and the first filtration membrane, and a position between the second protective member and the second filtration membrane. And a second adhesive.

The first supply liquid flow path and the second supply liquid flow path have sizes corresponding to the sizes of the first supply liquid flow path and the second supply liquid flow path ( For example, supply spacers of approximately the same size) may be arranged.

Moreover, the membrane separation apparatus for filtering a liquid according to the present invention is a membrane separation apparatus for filtering a liquid as another aspect, and a first supply liquid flow path through which a supply liquid to be filtered flows A first main body having a second main body having a second supply liquid flow path through which a supply liquid to be filtered flows, and two sheets positioned between the first main body and the second main body And a flat and permeable spacer positioned between the two flat filtration membranes, the first main body facing the second main body And a first filtration membrane that defines the first supply liquid flow path with the first filtration membrane located on the first main body side of the two filtration membranes. It has a concave surface and a first convex surface surrounding the first concave surface, and the second main body faces the first main body. A second recess having an inner surface, the inner surface defining the second permeate channel with the second filtration membrane located on the second main body side of the two filtration membranes A first adhesive having a surface and a second convex surface surrounding the second concave surface, and located between the first main body and the first filtration membrane, and the second And a second adhesive positioned between the main body and the second filtration membrane.

The first supply liquid flow path and the second supply liquid flow path have sizes corresponding to the sizes of the first supply liquid flow path and the second supply liquid flow path, respectively. A supply spacer may be arranged.

Furthermore, the supply spacer may be made of a mesh-like material that allows a supply liquid to pass through. Thus, by using a mesh-like material for the supply liquid flow path, it is possible to give an appropriate resistance to the liquid flowing inside. Therefore, the pressure of the supply liquid flowing inside the supply spacer can be appropriately increased.

In the permeate channel, a permeation spacer having a size corresponding to the size of the permeate channel may be arranged.

Furthermore, the transmission spacer may have a structure in which a plurality of holes communicating with each other are provided. By using a material having such a structure for the permeation spacer, the liquid after permeation that has permeated the filtration membrane can stably flow through the permeate passage.

Further, in the membrane separation device for filtering a liquid according to the present invention, the adhesive positioned between the first filtration membrane and the first main body further includes the filtration membrane of the first filtration membrane and the first membrane. It can also be located so that the peripheral part of the main body may adhere | attach. By doing in this way, the 1st filtration membrane and the 1st main part can be fixed, without reducing the filtration efficiency of the liquid by the 1st filtration membrane.

Further, in the membrane separation device for filtering a liquid according to the present invention, the adhesive positioned between the second filtration membrane and the second main body further includes the filtration membrane of the second filtration membrane and the second membrane. It can also be located so that the peripheral part of the main body may adhere | attach. By doing in this way, the 2nd filtration membrane and the 2nd main part can be fixed, without reducing the filtration efficiency of the liquid by the 2nd filtration membrane.

In order to achieve the above object, the present invention provides, as another aspect, a membrane separation unit for filtering a liquid, which is a first flat and permeable first flow of supply liquid to be filtered. A supply spacer; a first protection member surrounding the first supply spacer; a flat and permeable second supply spacer through which a supply liquid to be filtered flows; and the second supply spacer Two flat members positioned between the second protective member surrounding the periphery, the first supply spacer and the first protective member, and the second supply spacer and the second protective member. A filtration membrane and a flat permeation spacer located between the two flat filtration membranes, and a first located between the first protective member and the first filtration membrane. Adhesive, the second protective member and the second filtration membrane And a second adhesive located.

The membrane separation unit for filtering a liquid according to the present invention includes a size of an inner peripheral portion of the first protective member that is in contact with an outer peripheral portion of the first supply spacer, and the second protective member. The size of the inner peripheral part in contact with the outer peripheral part of the second supply spacer may be different. In this way, by changing the size of the inner peripheral portion of each protection member, the load is applied to the filtration membrane by the first protection member, and the load is applied to the filtration membrane by the second protection member. Since the position shifts, the stress applied to the filtration membrane can be dispersed. As a result, generation | occurrence | production of the damage | wound and dent to the said filtration membrane can be suppressed.

In the membrane separation unit for filtering a liquid according to the present invention, a permeate discharge channel into which the filtered permeate flows is formed in a part of the peripheral portion of the permeation spacer, In the permeated liquid discharge channel, the first protective member and the second protective member are integrally formed by extending from a part of the peripheral portion, and among the peripheral portions of the permeation spacer, The portion where the permeate discharge channel is not installed can be blocked with an adhesive.

According to the present invention, it is possible to provide a structure of a membrane separation device that suppresses the occurrence of crushing and scratching of the filtration membrane.

It is an assembly drawing which shows each component of the membrane separator which concerns on 1st Embodiment. It is sectional drawing of the membrane separator which concerns on 1st Embodiment. It is a schematic diagram which shows the positional relationship of each component of the membrane separator which concerns on 1st Embodiment. It is sectional drawing of the membrane separator which concerns on 2nd Embodiment. It is a perspective view of the membrane separation unit which concerns on 3rd Embodiment. It is sectional drawing of the membrane separation unit which concerns on 4th Embodiment. It is a top view of the membrane separation unit which concerns on 4th Embodiment. It is sectional drawing which shows the outline of the membrane separator which concerns on 4th Embodiment. It is a perspective view which shows the outline of the membrane separator which concerns on 4th Embodiment.

Hereinafter, embodiments of the present invention will be described in detail and specifically based on the drawings.

[First Embodiment]
First, the outline of the configuration of the membrane separation apparatus according to the first embodiment will be described with reference to FIG. FIG. 1 is an exploded view showing each component of the membrane separation apparatus according to the first embodiment. As shown in FIG. 1, a membrane separation apparatus 10 according to the present embodiment includes a shim ring 9, an outer seal material 5, a supply spacer 3, an inner seal material 4, and a protective member with a primary side main body 1 and a secondary side main body 2. 6, the filter membrane 7 and the permeation spacer 8 are sandwiched. Each member is fixed by receiving a compression force by being sandwiched between the primary side main body 1 and the secondary side main body 2. Further, the primary side main body 1 and the secondary side main body 2 are fixed by bolts 19.

Next, the detailed structure of the membrane separation apparatus according to the first embodiment will be described with reference to FIGS. 1 and 2. FIG. 2 is a cross-sectional view of the membrane separation apparatus according to the first embodiment. The position of the cross section corresponds to the AA cross section in FIG.

As shown in FIG. 2, the upper end surface of the primary side main body 1 in the figure has a primary side concave surface 11 located in the center and a primary side convex surface 12 surrounding the primary side concave surface 11. The depth of the primary concave surface 11 and the depth of the concave with respect to the primary convex 12 correspond to (for example, substantially the same) the width and thickness of the supply spacer 3 disposed here. Therefore, as shown in FIG. 2, the supply spacer 3 can be accommodated in the recess formed by the primary recess surface 1 with almost no gap. Here, the region surrounded by the primary concave surface 11 and the filtration membrane 7 (region where the supply spacer 3 is arranged) is a supply liquid flow path so that the liquid to be filtered flows. It has become.

As shown in FIG. 2, a supply port 13 and a concentrated water discharge port 14 are provided at both ends of the primary recess surface 11 of the primary body 1. Each of the supply port 13 and the concentrated water discharge port 14 has a hole shape that is inserted vertically in the figure. In addition, as shown in FIG. 1, the shape of these holes is an oval shape (or substantially rectangular shape) when viewed from the opening end direction of the holes. Here, although the supply port 13 and the concentrated water discharge port 14 are distinguished for convenience of explanation, these structures are the same (symmetric in the figure). Therefore, the role (and name) can be switched when the apparatus is used.

Further, as shown in FIG. 2, on the upper end surface in the figure of the primary convex surface 12, the inner sealing material groove 16, the positioning pins 15, An outer seal material groove 17 and a bolt hole 18 are provided.

Further, as shown in FIG. 2, the inner sealing material 4 is disposed in the inner sealing material groove 16, and the outer sealing material 5 is disposed in the outer sealing material groove 17, respectively. Here, as shown in FIG. 1, each of the inner sealing material 4 and the outer ring 5 has a single ring shape.

Furthermore, a positioning pin 15 is provided between the inner ring groove 16 and the outer seal material groove 17 on the primary convex surface 12. The positioning pin 15 has a cylindrical shape protruding upward, and has a shape corresponding to a positioning hole 25 provided at a corresponding position of the secondary side main body 2. As shown in FIG. 2, the positioning pin 15 is inserted into the positioning hole 25 when the primary side main body 1 and the secondary side main body 2 are assembled.

Further, a bolt hole 18 is provided on the outer side of the groove for the outer sealing material on the primary convex surface 12 in the drawing. Further, a bolt hole 28 is provided at a location corresponding to the bolt hole 18 in the secondary side main body 2. Thereby, by inserting the bolt 19 from the upper part of the bolt hole 28 in FIG. 2, the bolt 19 can be inserted into the bolt hole 18 and the primary side main body 1 and the secondary side main body 2 can be fixed. It has become.

On the other hand, as shown in FIG. 2, a permeate discharge passage 23 penetrating in the vertical direction is provided at the center of the secondary side main body 2. The width of the permeate discharge channel 23 is narrower than the widths of the supply port 13 and the concentrated water discharge port 14 provided in the primary side main body 1. This is because the flow rate of the liquid passing through the permeate discharge channel 23 is often smaller than the flow rate of the liquid passing through the supply port 13 and the concentrated water discharge port 14. In addition, as shown in FIG. 1, the shape which looked at the permeate discharge flow path 23 from the opening end side is an oval (or a substantially rectangular shape).

As shown in FIG. 2, in the lower end surface of the secondary side main body 2, the portion corresponding to the primary concave surface 11 in the primary side main body 1 is a secondary side that is recessed one step upward in the figure from the surroundings. A concave surface 21 is provided. In addition, a transmissive spacer 8 corresponding to the size of the recess is disposed on the secondary recess surface 21. In the present embodiment, the permeable spacer 8 has a plurality of holes communicating with the inside, so that the liquid can pass through the inside. Here, the region surrounded by the secondary concave surface 21 and the filtration membrane 7 (the region where the permeation spacer 8 is disposed) is a permeate channel, and the liquid that has passed through the filtration membrane 7 It is a flowing channel.

Further, the periphery of the secondary concave surface 21 is a secondary convex surface 22, which protrudes downward in FIG. 2 from the secondary concave surface 21. The secondary recess surface 21 has a positioning hole 25 that is recessed leftward and rightward symmetrically from the center in the figure toward the outside (both left and right sides), and a bolt hole 28 that penetrates in the vertical direction in the figure. Are provided.

As shown in FIG. 2, a filtration membrane 7 is disposed between the primary side main body 1 and the secondary side main body 2. The filtration membrane 7 can be a filtration membrane having micropores such as a reverse osmosis membrane (RO membrane). The lengths of the filtration membrane 7 in the width direction and the depth direction in FIG. 2 are at least longer than the widths and depths of the primary-side concave surface 11 and the secondary-side concave surface 21, and the width of the inner sealing material groove 16 and It is longer than the depth.

Furthermore, a protective member 6 is provided between the primary side main body 1 and the filtration membrane 7. The protective member 6 extends at least from the portion in contact with the inner sealing material 4 to the boundary between the primary convex surface 12 and the primary concave surface 11 of the primary body 1. As shown in FIG. 1, the protective member 6 has a rectangular frame shape in the first embodiment, and is disposed so as to surround the four sides of the primary-side concave surface 11 in the same manner. .

Note that FIG. 3 is a schematic diagram created for the purpose of assisting understanding of the positional relationship of each component. FIG. 3 shows an arrangement relationship of some components from the viewpoint from above in FIG. As shown in FIG. 3, the filtration membrane 7 extends over a wider range than the protective member 6. Further, the inner sealing material 4 is arranged so as to overlap the protective member 6 as a whole.

Further, as shown in FIG. 2, a cylindrical shim ring 9 is inserted into the positioning pin 15. The shim ring 9 plays a role of ensuring a constant gap between the primary side main body 1 and the secondary side main body 2. The height of the shim ring 9 corresponds to the sum of the heights of the filtration membrane 7 and the protective member 6 (for example, substantially equal).

Furthermore, an adhesive (not shown) is interposed between the protective member 6 and the filtration membrane 7, and the protective member 6 and the filtration membrane 7 are bonded by this adhesive.

Next, a liquid filtering method by the membrane separation apparatus 10 according to the first embodiment will be described with reference to FIG. First, a liquid to be filtered is injected into the supply port 13 at a predetermined pressure. Then, the injected liquid flows from the right side to the left side in the drawing in the supply spacer 3 that is the supply liquid flow path, and is discharged from the concentrated water discharge port 14. Here, the liquid flowing inside the supply spacer 3 receives resistance by the mesh structure, so that the pressure of the liquid is maintained in the supply liquid flow path or the pressure is increased. By applying pressure in this manner, the liquid to be filtered is filtered by the filtration membrane 7. Then, the liquid that has passed through the filtration membrane 7 flows into the permeate channel (permeation spacer 8) located on the upper side in FIG. 2 and is discharged from the permeate drain channel 23. On the other hand, the concentrated supply water is discharged from the concentrated water discharge port 14.

On the other hand, in this filtration method, a predetermined pressure is applied to the supply liquid inside the membrane separation layer apparatus 10 as described above. This pressure may cause the supplied liquid to leak from between the filtration membrane 7 and the primary body 1. Therefore, an inner sealing material 4 is provided between the filtration membrane 7 and the primary side main body 1.

The inner sealing material 4 is compressed by the primary side main body 1 located on the lower side in FIG. 2 and the protective member 6 located on the upper side, and is appropriately deformed. Thereby, the inner side sealing material 4 plays the role of a buffering agent, and plays the role which prevents the liquid used as filtration object from leaking from the clearance gap between upper and lower components (protective member 6 and the primary side main body 1). .

Here, the membrane separation apparatus 10 according to the first embodiment has an undesirable problem when a fine scratch or dent is generated in the filtration membrane 7. Specifically, the liquid supplied from the gaps caused by scratches and dents leaks, thereby reducing the filtration performance. Moreover, when the liquid flows out from such a gap, the pressure applied to the liquid being filtered is reduced, and the filtration efficiency is significantly reduced.

By the way, the reason why such fine scratches and dents are generated in the filtration membrane 7 has not been clarified in detail. However, in the membrane separator close to the membrane separator 10 in the first embodiment, in the vicinity of the inner seal material 4 and in the vicinity of the boundary between the primary convex surface and the primary concave surface in the primary body. It has been found by the inventors' research that they tend to occur frequently.

On the other hand, in the membrane separation apparatus 10 according to the first embodiment, the boundary between the primary convex surface and the primary concave surface of the primary body is exceeded from the position between the filtration membrane 7 and the inner sealing material 4. The protective member 6 is arranged up to the position. Therefore, generation | occurrence | production of the fine damage | wound and dent to the filtration membrane 7 can be suppressed.

The outer sealing material 5 is compressed and deformed by the primary side main body 1 located on the middle lower side and the secondary side main body 2 located on the upper side, like the inner sealing material 4, and the gap between these parts Therefore, the liquid to be filtered is prevented from leaking and also serves as a buffer for the upper and lower members.

Here, the protective member 6 and the filtration membrane 7 are bonded by an adhesive. Therefore, it is possible to effectively prevent the liquid to be filtered from leaking from the gap between the protective member 6 and the filtration membrane 7.

In the first embodiment, the portion fixed by the adhesive is only between the protective member 6 and the filtration membrane 7. In this way, only the protective member 6 and the filtration membrane 7 that are relatively frequently replaced can be easily replaced by being not adhered to other parts.

Various kinds of members can be used for the parts used in the first embodiment. For example, a material having chemical resistance and high durability such as stainless steel such as SUS316L or an alloy such as Hastelloy can be used for the primary side main body 1 and the secondary side main body 2. As the filtration membrane 7, a RO membrane or the like having a communication hole and made of a polyamide material or the like can be used. For the protective member 6, a material having chemical resistance and high durability and a resin material such as PVC (polyvinyl chloride) can be used. For the transmissive spacer 8, a porous sintered metal made of SUS304 or the like having a thickness of about 1.0 mm can be used, or a mesh-like material that allows liquid to pass through the inside can also be used. . For the supply spacer 3, a mesh-like material having a thickness of about 0.5 mm to about 1.5 mm can be used. For the inner sealing material 4 and the outer sealing material 5, materials such as fluorine rubber, nitrile butyl rubber, hydrogenated nitrile rubber, and perfluoroelastomer having a diameter of about 3.0 mm to 4.0 mm can be used. Moreover, as a material of the adhesive, a two-component curable urethane-based adhesive using a mixture of polyol and polyisocyanate can be used.

[Second Embodiment]
A membrane separation apparatus according to the second embodiment will be described with reference to FIG. Since the second embodiment is a modification of the first embodiment (FIGS. 1 to 3), the same parts in the drawings are denoted by the same reference numerals and redundant description is omitted, and the differences are omitted. This will be described in detail.

In the membrane separation apparatus 210 in the second embodiment, among the membrane separation apparatus 10 shown in the first embodiment, the inner sealing material 4, the inner sealing material groove 16, the protective member 6, the positioning pin 15, and the positioning. The hole 25 and the shim ring 9 are omitted. Furthermore, the filtration membrane 7 and the contact part of the primary side main body 1 are adhered by an adhesive. By setting it as such a structure, the liquid leak by the performance deterioration of a sealing material can be eliminated.

In the present embodiment, the size of the primary concave surface 11 is smaller than the size of the secondary concave surface 21 from the front view in FIG. Thereby, the position of the boundary between the primary concave surface 11 and the primary convex surface 12 is shifted from the boundary position between the secondary concave surface 21 and the secondary convex surface 22. As a result, the position of the force applied to the filtration membrane 7 is different in the vertical direction, and scratches and dents generated in the filtration membrane 7 can be suppressed.

In addition, the magnitude | size of the primary side recessed part surface 11 and the secondary side recessed part surface 21 can also be made into a different magnitude | size similarly about the depth direction in FIG. Furthermore, the primary side concave surface 11 can be made larger than the secondary side concave surface 21. Such a modification in which the sizes of the primary side and the secondary side are different can also be adopted in the first embodiment.

[Third Embodiment]
A membrane separation unit according to the third embodiment will be described with reference to FIG. Note that the third embodiment is a modification of the first embodiment (FIGS. 1 to 3), and therefore, redundant description will be omitted and differences will be described in detail.

FIG. 5 is a diagram showing a membrane separation unit 310 according to the third embodiment. In FIG. 5, description of portions corresponding to the primary side main body 1 and the secondary side main body 2 (see FIG. 2) described in the first embodiment is omitted for the purpose of assisting understanding of the description. Yes.

FIG. 5 shows a laminated structure of five layers. A frame-shaped protective member 106 is disposed on the uppermost layer in FIG. A supply spacer 103 having a large thickness (for example, substantially the same thickness) corresponding to the protection member 106 is disposed inside the protection member 106. And in this lower layer, the filtration membrane 107 is arrange | positioned. Further, a transmissive spacer 108 is disposed in the lower layer. In the laminated structure shown in FIG. 5, the same members are arranged on the upper and lower objects with the transmission spacer 108 as the center. That is, the filtration membrane 107 is disposed below the permeation spacer 108, and further, a layer composed of the supply spacer 103 and the protective member 106 surrounding the supply spacer 103 is disposed below the filtration membrane 107.

For fixing each layer, for example, the adhesive used in the first embodiment can be used. In the present embodiment, all the five stacked layers are fixed with an adhesive. However, the fixing method is not limited to this, and only the protective member 106 and the filtration membrane 107 may be bonded with an adhesive, and other components may be fixed with bolts or the like. Further, as a bonding method, the protective member 106 may be fixed by applying an adhesive to the entire surface in contact with the filtration membrane 107. In addition, when the filtration membrane 107 and the permeation spacer 108 are fixed with an adhesive, only the vicinity of the peripheral portion is adhered to avoid the center portion in order to ensure the filtration performance and permeation performance of the liquid.

In the membrane separation unit 310 according to the third embodiment, the permeated water that has permeated through the filtration membrane 107 flows into the permeation spacer 108 by flowing the liquid to be filtered from the vertical direction in the figure. Then, the permeated water is discharged from the end of the permeable spacer 108.

In the membrane separation unit 310 according to the third embodiment, since the liquid to be filtered can be made to flow simultaneously from the vertical direction in the figure, the filtration efficiency is improved. Moreover, since pressure can be applied uniformly from above and below, deformation due to the pressure of each layer can be suppressed. For this reason, damage to the filtration membrane 107 can be suppressed, and as a result, the useful life of the membrane separation unit 310 can be extended.

Note that the permeable spacer 8 in the third embodiment employs a mesh-like material that allows liquid to pass through the inside. However, it is also possible to use a sintered metal having a plurality of holes communicating with each other as employed in the first embodiment and the second embodiment.

[Fourth Embodiment]
A membrane separation unit and a membrane separation apparatus according to the fourth embodiment will be described with reference to FIGS. Note that the fourth embodiment is a modification of the third embodiment (FIG. 5), and therefore, redundant description will be omitted and differences will be described in detail.

FIG. 6 shows a cross-sectional view of a membrane separation unit 410 according to the fourth embodiment. As shown in FIG. 6, the uppermost protective member 106b in the membrane separation unit 410 is annular (or ring-shaped) at the right end in the figure, and is connected to and integrated with the lowermost protective member 106b. Furthermore, the cavity inside the annular portion is a permeate discharge channel 123 through which permeate flows.

Here, the permeation spacer 8 has a portion (left end, back end, front end) 411 (hereinafter referred to as a sealing portion) other than the right end in FIG. It can be closed by applying or impregnating an adhesive. As a result, all of the liquid flowing into the permeation spacer 8 flows out to the permeate discharge channel 123 at the right end in the figure. The end of the transmissive spacer 8 is replaced with another member (for example, the primary side main body as shown in the first to third embodiments) on the outer periphery of the sealing portion 411 instead of the method of closing with the adhesive. 1 and the secondary side main body 2 etc. can be installed to allow permeate to flow into a predetermined flow path.

FIG. 7 is a top view of the membrane separation unit 410 according to the fourth embodiment. As shown in FIG. 7, the permeate discharge channel 123 has a closed end on the lower side in the drawing and an open end on the upper side in the drawing. Therefore, the liquid flowing in from the opening of the protective member 106b is filtered by the filter membrane 107, flows through the permeation spacer 108, and then flows into the permeate discharge channel 123, and the direction of the arrow shown on the upper side in FIG. Will be discharged.

In this embodiment, one end of the permeate discharge channel is a closed end, but both sides may be open ends. Further, the permeate discharge channel 123 can be provided at both the left and right ends in the figure. Further, the permeation spacer 108 and the filtration membrane 107 may have a structure in which the end face is closed in order to prevent liquid from leaking from the end face.

FIG. 8 shows a cross-sectional view of a membrane separation apparatus 510 using the membrane separation unit 410 according to the fourth embodiment. FIG. 9 shows a perspective view of a membrane separation apparatus 510 using the membrane separation unit 410 according to the fourth embodiment. As shown in FIG. 8, the membrane separation apparatus 510 has a first main body 401 and a second main body 402 arranged above and below the membrane separation unit 410. Further, a sealing material 403 is disposed between the protective member 106 b and the second main body 402 and between the protective member 106 b and the first main body 401. In addition, without using the sealing material 403, the protective member 106b and the second main body 402 and the protective member 106b and the first main body 401 can be directly bonded by an adhesive. The upper and lower first main bodies 401 and the second main body 402 are fixed with bolts (not shown).

As shown in FIGS. 8 and 9, the first main body 401 is provided with a first supply port 413 and a first concentrated water discharge port 414 extending in the vertical direction in the figure, and the supply liquid therebetween A supply spacer 430 is installed in the flow path. Similarly, the second main body 402 is also provided with a second supply port 423 and a second concentrated water discharge port 424, and a supply spacer 440 is installed in the supply liquid channel therebetween.

With the structure as described above, when liquid to be filtered is supplied from the upper and

lower supply ports

413 and 423, the permeate discharge channel 123 provided in the membrane separation unit 410 (the direction of the arrow on the back side in FIG. 9). Permeated water is discharged from. Further, of the supplied liquid, the concentrated water that has been concentrated without being filtered is discharged from the upper and lower concentrated

water discharge ports

414 and 424.

Note that, as in the third embodiment, a mesh-like material that allows liquid to pass through is used for the transmissive spacer 8 in the fourth embodiment. However, it is also possible to use a sintered metal having a plurality of holes communicating with each other as employed in the first embodiment and the second embodiment. Further, the fourth embodiment may be modified as in the second embodiment. That is, the first main body and the second main body may be directly bonded to the membrane separation unit 410 except for the protective member and the seal member.

[Other aspects]
The description of the above-described embodiment is an example for explaining the membrane separation apparatus and the method and apparatus for manufacturing the membrane separation unit according to the present invention, and does not limit the invention described in the claims. Moreover, each part structure of this invention is not restricted to embodiment mentioned above, A various deformation | transformation is possible within the technical scope as described in a claim.

For example, in the above embodiment, the sizes of the supply liquid channel and the permeate channel do not have to be the same. For example, the width and depth of the supply liquid channel (the front in FIGS. 2, 4, and 8). May be larger than the width and depth of the permeate channel. Moreover, in said embodiment, although the metal is used for a primary side main body and a secondary side main body (or 1st main body and 2nd main body), a resin material can also be used. Further, although there are places where bolts are used for fixing, they can be fixed by other fixing methods such as fitting and welding. Furthermore, the filtration membrane used in the present embodiment may be a laminate of a plurality of filtration membranes.

DESCRIPTION OF SYMBOLS 1 Primary side main body 2 Secondary side main body 3 Supply spacer 4 Inner sealing material 5 Outer sealing material 6 Protective member 7 Filtration membrane 8 Permeation spacer 9 Shim ring 10 Membrane separator 11 Primary side concave surface 12 Primary side convex surface 13 Supply port 14 Concentrated water outlet 15 Positioning pin 16 Inner seal material groove 17 Outer seal material groove 18 Bolt hole 19 Bolt 21 Secondary side concave surface 22 Secondary side convex surface 23 Permeate discharge channel 25 Positioning hole 28 Bolt hole 103 Supply spacer 106 Protective member 106b Protective member 107 Filtration membrane 108 Permeation spacer 123 Permeate discharge channel 310 Membrane separation unit 401 First main body 402 Second main body 403 Sealing material 411 Sealing portion 413 First supply port 414 First Concentrated water discharge port 410 Membrane separation unit 42 The second supply port 424 second concentrated water discharge port 430 feed spacer 440 feed spacer 510 membrane separation unit

Claims

A membrane separation device for filtering liquid,
A primary body having a supply liquid flow path through which a supply liquid to be filtered flows;
A secondary body having a permeate channel through which the filtered permeate flows;
A flat filtration membrane positioned between the primary body and the secondary body;
With
The primary body has an inner surface that faces the secondary body, and the inner surface defines a primary recess surface that defines the supply liquid flow path with the filtration membrane, and the primary recess surface. And a primary convex surface surrounding
The secondary side body has an inner surface facing the primary side body, and the inner side surface is a secondary side concave surface defining the permeate flow path with the filtration membrane, and the secondary side. A secondary convex surface surrounding the concave surface,
Further, a sealing material located between the primary side convex surface of the primary side main body and the filtration membrane,
A boundary between the surface of the primary side concave portion of the primary side main body and the surface of the primary side convex portion from at least a portion of the surface of the filtration membrane that is located between the sealing material and the filtration membrane and is in contact with the sealing material. A flat protective member extending up to,
A membrane separation apparatus comprising: an adhesive positioned between the protective member and the filtration membrane.
The membrane separator according to claim 1, wherein a supply spacer having a size corresponding to the size of the supply liquid channel is arranged in the supply liquid channel.
The membrane separator according to claim 1, wherein the supply spacer is made of a mesh material.
The membrane separation device according to claim 1, wherein a permeation spacer having a size corresponding to the size of the permeate flow channel is disposed in the permeate flow channel.
The membrane separator according to claim 1, wherein the permeation spacer has a structure in which a plurality of holes communicating with each other are provided.
A membrane separation device for filtering liquid,
A primary body having a supply liquid flow path through which a supply liquid to be filtered flows;
A secondary body having a permeate channel through which the filtered permeate flows;
A flat filtration membrane positioned between the primary body and the secondary body;
With
The primary body has an inner surface that faces the secondary body, and the inner surface defines a primary recess surface that defines the supply liquid flow path with the filtration membrane, and the primary recess surface. And a primary convex surface surrounding
The secondary side body has an inner surface facing the primary side body, and the inner side surface is a secondary side concave surface defining the permeate flow path with the filtration membrane, and the secondary side. A secondary convex surface surrounding the concave surface,
Furthermore, it is located between the primary side convex part surface of the primary side main body and the filtration membrane, and on the surface of the filtration membrane, at least the primary side concave part surface of the primary side main body and the primary side convex part surface A membrane separation device comprising: an adhesive extending over a portion including the boundary.
The membrane separator according to claim 6, wherein a supply spacer having a size corresponding to the size of the supply liquid channel is arranged in the supply liquid channel.
The membrane separator according to claim 6, wherein the supply spacer is made of a mesh material.
The membrane separation device according to claim 6, wherein a permeation spacer having a size corresponding to the size of the permeate flow channel is disposed in the permeate flow channel.
The membrane separator according to claim 6, wherein the permeation spacer has a structure in which a plurality of holes communicating with each other are provided.
A membrane separation device for filtering liquid,
A first body having a first supply liquid flow path through which a supply liquid to be filtered flows;
A second body having a second supply liquid flow path through which the supply liquid to be filtered flows;
Two flat filtration membranes positioned between the first body and the second body;
A flat permeation spacer located between the two flat filtration membranes,
The first main body has an inner surface facing the second main body, and the inner surface is a first filtration membrane located on the first main body side of the two filtration membranes; A first concave surface defining the first supply liquid flow path, and a first convex surface surrounding the first concave surface,
The second main body has an inner surface facing the first main body, and the inner surface is a second filtration membrane located on the second main body side of the two filtration membranes; A second concave surface defining the second permeate flow path, and a second convex surface surrounding the second concave surface,
Furthermore, a first sealing material located between the first convex surface of the first main body and the first filtration membrane,
A second sealing material positioned between the second convex surface of the second main body and the second filtration membrane;
The first main body is located between the first sealing material and the first filtration membrane, and at least from the portion in contact with the first sealing material on the surface of the first filtration membrane. A flat first protective member extending to the boundary between one concave surface and the first convex surface;
The second main body is located between the second sealing material and the second filtration membrane, and at least from the portion in contact with the second sealing material on the surface of the second filtration membrane. A flat second protective member extending over the boundary between the second concave surface and the second convex surface;
A first adhesive located between the first protective member and the first filtration membrane;
A membrane separation device comprising: a second adhesive positioned between the second protective member and the second filtration membrane.
The first supply liquid flow path and the second supply liquid flow path have supply spacers having sizes corresponding to the sizes of the first supply liquid flow path and the second supply liquid flow path, respectively. The membrane separation apparatus according to claim 11, wherein
A membrane separation device for filtering liquid,
A first body having a first supply liquid flow path through which a supply liquid to be filtered flows;
A second body having a second supply liquid flow path through which the supply liquid to be filtered flows;
Two flat filtration membranes positioned between the first body and the second body;
A flat and permeable spacer located between the two flat filtration membranes,
The first main body has an inner surface facing the second main body, and the inner surface is a first filtration membrane located on the first main body side of the two filtration membranes; A first concave surface defining the first supply liquid flow path, and a first convex surface surrounding the first concave surface,
The second main body has an inner surface facing the first main body, and the inner surface is a second filtration membrane located on the second main body side of the two filtration membranes; A second concave surface defining the second permeate flow path, and a second convex surface surrounding the second concave surface,
A first adhesive located between the first body and the first filtration membrane;
A membrane separation device comprising: a second adhesive positioned between the second main body and the second filtration membrane.
The first supply liquid flow path and the second supply liquid flow path have supply spacers having sizes corresponding to the sizes of the first supply liquid flow path and the second supply liquid flow path, respectively. The membrane separation apparatus according to claim 13, wherein
A membrane separation unit for filtering liquid,
A flat and permeable first supply spacer through which the supply liquid to be filtered flows;
A first protective member surrounding the first supply spacer;
A flat and permeable second supply spacer through which the supply liquid to be filtered flows;
A second protective member surrounding the second supply spacer;
Two flat filtration membranes positioned between the first supply spacer and the first protective member and the second supply spacer and the second protective member;
A flat permeation spacer located between the two flat filtration membranes,
A first adhesive located between the first protective member and the first filtration membrane;
A membrane separation unit comprising: a second adhesive positioned between the second protective member and the second filtration membrane.
A part of the peripheral edge of the permeation spacer is formed with a permeate discharge channel into which the filtered permeate flows.
The permeate discharge channel is formed integrally with the first protection member and the second protection member, each extending from a part of the peripheral edge,
The membrane separation unit according to claim 15, wherein a portion of the peripheral portion of the permeation spacer where the permeate discharge channel is not installed is closed with an adhesive.