JP2008018300A - Membrane cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a membrane cartridge which controls its clogging and rising of the resistance of the passage and causes a transmembrane differential pressure to act uniformly on the entire surface of the membrane. <P>SOLUTION: In the membrane cartridge 51 having a filter membrane 53 on the surface of a filter plate 52, a liquid-collecting section 56 connected to the liquid-passing passage between the filter membrane 53 and the filter plate 52 is disposed at a specified position of the filter plate 52; a liquid-passing groove pattern 61a which has a specified pattern and forms a liquid-passing groove 61b in the surface of the filter plate constituting the liquid-passing passage of the filter plate 52; and the liquid-passing groove pattern 61a formed in one of the front and back surfaces of the filter plate and that formed in the other are arranged at mutually deviated positions along the filter plate. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a membrane cartridge and relates to a solid-liquid separation technique in sewage, industrial wastewater, domestic wastewater and the like.

  In conventional water treatment, for example, membrane separation activated sludge treatment (MBR), a submerged membrane separation device is immersed in a reaction tank that treats sewage, industrial wastewater, domestic wastewater and the like with activated sludge. Examples of the submerged membrane separator include those shown in FIGS. In this case, a submerged membrane separation device 2 immersed in the reaction tank 1 is filled with a plurality of organic flat membrane membrane cartridges 4 arranged in parallel at predetermined intervals in the main body casing 3. Each membrane cartridge 4 has a filtration membrane 4b made of an organic flat membrane on both front and back sides of a resin filter plate 4a, and the membrane surfaces are arranged along the vertical direction.

  An air diffuser 5 is disposed below the membrane cartridge 4 in the vicinity of the lower end opening of the air diffuser case 3 a disposed at the lower part of the main casing 3, and the total amount of the membrane surface cleaning gas ejected from the air diffuser 5 Flows into the main casing 3. Each membrane cartridge 4 is connected to a header (not shown) via a tube (not shown).

  In the submerged membrane separation device 2 described above, a flow path through which the liquid mixture in the tank flows is formed between the membrane cartridges 4 arranged in parallel, and the solid-gas liquid mixed phase is generated by the air lift action of the air ejected from the air diffuser 5. An upward flow 6 is generated, and the mixed liquid in the tank is supplied to the flow path between the membrane cartridges 4 by the upward flow 6.

  A suction pressure is applied to the membrane cartridge 4 by a suction pump 7, and the transmembrane differential pressure acting on the filtration membrane 4 b is driven as the mixed liquid in the tank flows in a cross flow along the membrane surface of the membrane cartridge 4. The filtration liquid 4b is filtered through the filtration membrane 4b, and the filtrate that has passed through the filtration membrane 4b is taken out as treated water.

  Further, by supplying the mixed liquid in the tank by cross flow, it is possible to suppress the solid content 8 from being pressed and adhered to the film surface of the film cartridge 4 by the transmembrane pressure difference. The deposits on the film surface are washed away.

  As a filter plate of the membrane cartridge having the above-described configuration, there is a configuration disclosed in Patent Document 1. As shown in FIG. 11, a large number of ridges 22 are provided in parallel to the water-permeable flow path spacer 21 in which flat membranes are arranged on both surfaces, and grooves 23 are formed between the ridges 22.

Patent Document 2 discloses a configuration in which vertical vertical water guides and a plurality of inclined water guides communicating with a plurality of vertical water guides are formed on the front and back surfaces of the filter plate.
In addition, in Patent Document 3, in a filtration membrane module in which the surface of a membrane support is covered with a filtration membrane, a recess serving as a flow path for a membrane permeate is formed on the surface of the membrane support and communicated with the recess. A configuration is disclosed in which a permeate suction pipe is provided for sucking the permeate and guiding it to the outside.
JP-A-7-194945 JP 2003-117358 A JP-A-6-178920

  By the way, the above-described configuration, that is, the upward flow 6 of the solid-liquid mixed phase is generated by the air lift action of the air ejected from the air diffuser 5, and the upward flow 6 causes the mixed liquid in the tank to flow between the membrane cartridges 4. To prevent the solid content 8 from sucking and adhering to the membrane surface of the membrane cartridge 4 due to the inter-membrane differential pressure, and washing the membrane surface with the rising flow 6 of the solid-gas-liquid mixed phase. In the configuration in which the membrane cartridge 4 is formed long in the vertical direction in order to effectively use the air lift action of the air ejected from the diffuser 5 and to increase the amount of membrane permeated water per membrane cartridge 4 There is.

  In this case, the strength of the membrane cartridge 4 becomes a problem. Since the membrane cartridge 4 is supported by the main casing 3 mainly at the side edges, the filter plate 4a of the membrane cartridge 4 undergoes surface vibration under the influence of the upward flow 6. For this reason, when a groove is formed in the filter plate 4a, stress acting on the filter plate 4a due to surface vibration may be concentrated on the groove, and the filter plate 4a may be cracked. May break.

  Further, when the groove is formed in the filter plate 4a, the cake easily adheres to the filtration membrane at the portion corresponding to the groove, and the flow path width between the adjacent membrane cartridges 4 becomes uneven. In particular, when the grooves are opposed to each other in the adjacent membrane cartridge 4, the non-uniformity of the flow path width between the adjacent membrane cartridges 4 becomes significant, the flow of the upward flow 6 is inhibited, and the entire membrane surface of the filtration membrane 4b is blocked. It becomes difficult to exert a cleaning action on the upward flow 6 to cause clogging.

  The present invention solves the above-described problems, and an object thereof is to provide a membrane cartridge capable of suppressing clogging of the membrane cartridge.

  In order to solve the above-described problems, the membrane cartridge of the present invention has a filtration membrane disposed on the surface of the filter plate, and a collecting portion communicating with a liquid flow path between the filtration membrane and the filter plate is provided on the filter plate. A membrane cartridge provided at a predetermined position, wherein a flow channel network including a flow channel is formed in a predetermined flow channel pattern on a filter plate surface covered with a filtration membrane, and the flow channel pattern is formed on the filter plate surface. The liquid passage groove is intermittently present on any straight line.

  In addition, the filter plate has a flow groove pattern on the front and back filter plate surfaces, and in the state where the liquid groove pattern formed on one filter plate surface is projected onto the other filter plate surface, both the flow groove patterns are shifted. It exists in a certain position.

  In addition, the filter plate has a flow groove pattern on the front and back filter plate surfaces, and in the state where the liquid groove pattern formed on one filter plate surface is projected onto the other filter plate surface, both the flow groove patterns are shifted. The liquid flow groove pattern formed on one filter plate surface and the liquid flow groove pattern formed on the other filter plate surface do not exist on the same straight line.

  In addition, the liquid passage groove pattern of the flow path network has a honeycomb shape.

  According to the present invention, the liquid flow groove pattern has a shape in which the liquid flow grooves intermittently exist on an arbitrary straight line on the filter plate surface, so that stress caused by surface vibration can be dispersed. It can prevent that a crack generate | occur | produces in a board. Moreover, clogging of the membrane cartridge can be suppressed by suppressing the cake from locally attaching to the filtration membrane.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 2, in the membrane cartridge 51, a filtration membrane 53 disposed on the front and back surfaces of the filter plate 52 is fixed to the filter plate 52 by a fixing portion 54 at the peripheral portion. is there. A liquid passage 55 is formed between the filter plate 52 and the filtration membrane 53, and a spacer (not shown) is disposed as necessary. The filtration membrane 53 is embossed on the front and back surfaces, and minute recesses 53a are formed at predetermined intervals (for example, 2.0 to 1.5 mm). The minute recesses 53a are, for example, elliptical (major axis 1.3 mm, minor axis 0). .8 mm). The bottom of the minute recess 53a is about half the thickness of the sheet thickness of the filtration membrane 53. The embossing can be changed to a minute convex portion instead of the minute concave portion 53a.

  As shown in FIG. 1, the filter plate 52 has a liquid collecting portion 56 communicating with the liquid flow passage 55 on one side of the filter plate in the width direction of the filter plate and is covered with the filter membrane 53. A liquid passage groove pattern 61 a having a predetermined pattern is formed on the surface of the filter plate 52. The liquid collecting part 56 communicates with a header forming part 62 provided at an upper position on the side part of the filter plate 52 through a through hole 52a.

  As shown in FIG. 5, the liquid flow groove pattern 61 a is a flow channel network including liquid flow grooves 61 b. The channel network has a plurality of branch points and junction points, and the liquid passage grooves 61b are joined in a non-linear manner at the branch points and the junction points, and the liquid passage groove pattern 61a is on an arbitrary straight line on the filter plate surface. In this embodiment, the liquid flow groove pattern 61a has a honeycomb shape.

  The liquid flow groove pattern 61a formed on one filter plate surface on the front and back of the filter plate 52 and the liquid flow groove pattern 61a formed on the other filter plate surface are the same as the liquid flow groove pattern 61a formed on one filter plate surface. In the state projected onto the filter plate surface, both of the liquid flow groove patterns 61a exist at positions shifted, and the liquid flow groove pattern 61a formed on one filter plate surface and the liquid flow groove formed on the other filter plate surface The same direction component in the pattern 61a does not exist on the same straight line.

In the present embodiment, the honeycomb-shaped liquid groove 61b is disclosed as an example of the liquid groove pattern. However, other patterns may be used, and each liquid groove pattern will be described later.
The filter plate 52 is provided with a flow path adjustment unit 57 in contact with the liquid collection unit 56 in a region near the liquid collection unit 56 on the filter plate surface. The flow path adjusting portion 57 is formed with a predetermined pattern of liquid collecting groove pattern 56a. The liquid collecting groove pattern 56a forms a liquid collecting groove 56b in a lattice shape, and between the liquid collecting groove 56b and the liquid collecting groove 56b. The channel resistance is reduced by forming the crest portion 56c and forming the liquid collecting groove 56b in a straight line. In the present embodiment, the liquid collection groove 56b formed in a lattice shape is disclosed as an example of the liquid collection groove pattern 56a, but other patterns may be used.

  In the filter plate 52, the liquid flow groove pattern 61a and the liquid collection groove pattern 56a form a flow path network as flow path resistance adjusting means, and the grooves per unit area in the liquid collection groove pattern 56a compared to the liquid flow groove pattern 61a. By forming a large number, the flow path resistance of the liquid collection groove pattern 56a is adjusted to be smaller than the flow path resistance of the liquid flow groove pattern 61a.

  In the present embodiment, the flow passage resistance is decreased stepwise by the liquid flow groove pattern 61a and the liquid collection groove pattern 56a forming the flow path network of the flow passage resistance adjusting means, but the liquid flow groove pattern 61a and the liquid collection groove pattern 61a are collected. The liquid groove pattern 56a can be formed so that the flow path resistance gradually decreases as the liquid collecting portion 56 is closer, or intermittently decreases.

  In the present embodiment, the liquid collection groove pattern 56a is formed in the filter plate 52 itself, but an opening that penetrates the filter plate 52 through the front and back is formed in the liquid collection unit 56, and the filter plate 52 and May be provided with a separate built-in member, and the liquid collecting groove pattern 56a may be formed on the built-in member.

  As shown in FIGS. 2 and 3, the filter plate 52 has a filter plate thick portion 52b protruding in the arrangement direction of the membrane cartridge 51 as compared with the filter plate surface on which the filter membrane 53 is arranged on both sides of the filter plate 52. It is formed over the entire height. The membrane cartridge 51 forms a filtration unit 70 as an assembly of a plurality of membrane cartridges 51, which will be described later, by connecting the filter plates 52 of the adjacent membrane cartridges 51 in contact with each other at the filter plate thick portion 52b. To do.

  Further, the filter plate 52 forms a filter plate connecting convex portion 52c and a filter plate connecting depression 52d forming a filter plate connecting portion in the filter plate thick portion 52b. The filter plate connecting portion is for positioning the relative positions of the filter plates 52 of the adjacent membrane cartridges 51, and the filter plate connecting convex portions 52c are arranged on one side of the front and back of the filter plate thick portion 52b. The filter plate coupling recess 52d is formed in a shape corresponding to the shape of the filter plate coupling convex portion 52c on the other surface of the filter plate thick portion 52b. The filter plate connection convex portion 52 c and the filter plate connection recess 52 d are formed to surround the connection hole 91 formed in the filter plate thick portion 52 b, and form an opening edge of the connection hole 91. The connecting hole 91 is for inserting the connecting rod 92, and penetrates the filter plate 52 and the header forming portion 62 in the front and back direction, and is formed at a plurality of locations at predetermined intervals.

  As shown in FIGS. 2 and 3, the header forming portion 62 provided at the upper position of the side portion of the filter plate 52 has a header channel portion 62a penetrating in the arrangement direction of the membrane cartridge 51, and the header channel portion 62a. Communicates with the flow passage 55 of the filter plate 52 and the filtration membrane 53 through the through hole 52a and the liquid collection part 56.

  The header forming portion 62 has a header thick portion 62 b that protrudes in the arrangement direction of the membrane cartridges 51 as compared with the surface of the filter plate 52 on which the filtration membrane 53 is disposed, and the header forming portions 62 of the adjacent membrane cartridges 51. Are in contact with each other at the header thick portion 62b to form the header 60 of the filtration unit 70.

  The header forming portion 62 has a header connecting convex portion 62c and a header connecting recess 62d forming a header connecting portion on the header thick portion 62b. The header connecting portion positions the relative positions of the header forming portions 62 of the adjacent membrane cartridges 51, and the header connecting convex portions 62c are arranged on one side of the front and back of the header thick portion 62b in the arrangement direction of the membrane cartridges 51. The header connecting recess 62d is formed in a shape corresponding to the shape of the header connecting convex portion 62c on the other side of the front and back of the header thick portion 62b.

  The header connecting convex portion 62c and the header connecting recess 62d are formed so as to surround the header channel portion 62a, and form an opening edge of the header channel portion 62a. An O-ring groove 62e is formed on the outer periphery of the header connecting convex portion 62c and the header connecting recess 62d, and an O-ring 62f is disposed in the O-ring groove 62e.

  As shown in FIG. 4, the header forming portion 62 can be formed with a die-cutting hole 62 g for easily molding the through hole 52 a of the filter plate 52. The punching hole 62g is formed in a linear position with the through hole 52a, and after the filter plate 52 is molded, the stopper 62h is bonded and fixed to be sealed watertight. In this embodiment, the header forming part 62 is formed integrally with the filter plate 52, but it can also be formed as a separate built-in member from the filter plate 52 and connected to the filter plate 52 for incorporation. . In this case, the through hole 52a of the filter plate 52 can be easily molded.

  As shown in FIG. 5, the honeycomb-shaped flow groove pattern 61a is formed by arranging hexagonal cells 61c in a staggered pattern and forming liquid flow grooves 61b around the cells 61c. In the up-and-down direction of the plate 52, the joining and branching are repeated without being continuous linearly.

  In addition, as shown in FIG. 6, the honeycomb-shaped liquid flow groove pattern 61a includes hexagonal cells 61c arranged in a grid of horizontal rows and vertical columns, and a rhombus shape between the rows. It is also possible to have a configuration in which the cell 61d is disposed and the liquid passage groove 61b is formed around the cells 61c and 61d. The liquid passage groove 61b is not continuous linearly in the vertical direction of the filter plate 52, and is joined. And branching is repeated.

  Further, as shown in FIG. 7 (a), the honeycomb-shaped liquid flow groove pattern 61a may have a configuration in which semicircular fan-shaped cells 61h are arranged in a staggered manner, and in this case, each cell 61h. Is formed so as to rise from the filter plate surface toward the upper side, and a liquid passage groove 61b is formed around the cell 61h. The liquid passage groove 61b does not continue in a straight line in the vertical direction of the filter plate 52, and merges and branches. It repeats.

  Further, as shown in FIG. 7 (b), the honeycomb-shaped liquid flow groove pattern 61a has a large circular cell 61i arranged in a grid of horizontal rows and vertical columns. It is also possible to arrange a small circular cell 61j between them, and the liquid passage groove 61b formed around the cells 61i and 61j does not continue linearly in the vertical direction of the filter plate 52, The branch is repeated.

As shown in FIG. 10, the submerged membrane separation apparatus 100 in the present embodiment forms a filtration unit 70 by superposing a plurality of membrane cartridges 51 in parallel.
In the filtration unit 70, as shown in FIG. 3, both the filter plates 52 of the adjacent membrane cartridges 51 abut each other at the filter plate thick portion 52b, and a vertical flow path is formed between the two membrane cartridges 51. The filter plate coupling convex portion 52c of one filter plate 52 is fitted into the filter plate coupling recess 52d of the other filter plate 52 to position the relative position of the filter plate 52 of the adjacent membrane cartridge 51. ing. In addition, both header forming portions 62 are in contact with each other at the header thick portion 62b, and the header connecting convex portion 62c of one membrane cartridge 51 is fitted into the header connecting recess portion 62d of the other membrane cartridge 51. The relative positions of the adjacent header forming portions 62 are positioned. The plurality of membrane cartridges 51 are integrated by inserting the connecting rod 92 into the connecting hole 91 and tightening a nut (not shown) screwed into the connecting rod 92.

  The filtration unit 70 that forms an assembly of the plurality of membrane cartridges 51 includes a side wall 71 (see FIG. 3) of the filtration unit 70 by the filter plate thick part 52b and the header thick part 62b that are in contact with each other. ), The header 60 is formed by the plurality of header forming parts 62 connected to each other, and the header flow path 62a of the header forming part 62 is continuous to form a header flow path in the header 60.

  A plurality of filtration units 70 are arranged on the air diffuser case 100a with a predetermined gap therebetween, and the air diffuser 80 is disposed inside the air diffuser case 100a. Further, a suction device (not shown) is provided connected to the header flow path of the header 60, and an operation control device that controls the operation of the suction device under a predetermined condition is provided. In addition, the plurality of filtration units 70 are arranged along the horizontal direction by arranging the plurality of submerged membrane separation devices 100 in the reaction tank 1 at predetermined intervals.

  Hereinafter, the operation of the above-described configuration will be described. The liquid flow groove pattern 61a formed on one filter plate surface on the front and back of the filter plate 52 and the liquid flow groove pattern 61a formed on the other filter plate surface are the same as the liquid flow groove pattern 61a formed on one filter plate surface. In the state projected onto the filter plate surface, both of the liquid flow groove patterns 61a exist at positions shifted, and the liquid flow groove pattern 61a formed on one filter plate surface and the liquid flow groove formed on the other filter plate surface The same direction component in the pattern 61a does not exist on the same straight line.

  Therefore, although the liquid flow groove pattern 61a is formed on the front and back filter plate surfaces, the stress caused by the surface vibration can be dispersed to suppress the deterioration of the strength of the filter plate 52, and the filter plate is cracked. Can be prevented.

  Further, the liquid passage groove pattern 61a formed on the filter plate surfaces on the front and back sides of the filter plate is displaced in the direction along the filter plate surface, so that the submerged membrane separator is filled with a plurality of membrane cartridges 51 in parallel. In addition, the position of the liquid passage groove 61b is shifted in the direction along the filter plate surface on both filter plate surfaces of the adjacent membrane cartridges 51 facing each other. This relationship is the same as the positional relationship of the liquid passage groove 61b on the front and back of the filter plate 52 shown in FIG.

  During operation of the submerged membrane separator, the solid content is easily sucked and adhered to the membrane surface of the filtration membrane 53 corresponding to the liquid passage groove 61b by the transmembrane pressure difference, but the adjacent membrane cartridges 51 face each other. The position of the liquid passage groove 61b on both the filter plate surfaces is shifted in the direction along the filter plate surface, so that the solid content easily adheres to one of the opposing filter membranes 53 of the adjacent membrane cartridge 51, and the other It is possible to prevent the portion of the filtration membrane 53 where solids easily adhere from overlapping in the flow path width direction between the two membrane cartridges 51, and to prevent the flow path width between the membrane cartridges 51 from becoming uneven, The flow of the upward flow can be effectively applied to the entire membrane surface of the filtration membrane 53 to prevent blockage of the channel between the membrane cartridges 51 and clogging of the filtration membrane 53. Further, the embossed membrane surface of the filtration membrane 53 suppresses the adhesion of the solid content, and the adhesion between the filtration membrane 53 and the filter plate 52 is alleviated and contributes to water permeability in the liquid flow passage 55.

  In a state where the membrane cartridge 51 is used in the submerged membrane separation device, a transmembrane differential pressure acts on the filtration membrane 53 between the liquid passage 55 and the outside across the filtration membrane 53, and the liquid passage 55. The liquid collection unit 56 is in a reduced pressure state as compared with the outside of the membrane cartridge 51, and the filtration membrane 53 tends to be in close contact with the filter plate 52 as the differential pressure between the inside and the outside (intermembrane differential pressure) increases.

  In such a state where the liquid flow path 55 and the liquid collection part 56 are in a reduced pressure environment, the liquid collection groove 56b and the liquid collection groove 56b of the liquid collection groove pattern 56a are used in the flow path adjustment part 57 immediately adjacent to the liquid collection part 56. A crest 56c between the two supports the filtration membrane 53, suppresses the narrowing of the flow path of the liquid collection portion 56 due to deformation of the filtration membrane 53, and allows a predetermined flow in the liquid collection groove 56b of the liquid collection groove pattern 56a. A road can be secured. Further, the honeycomb-shaped liquid flow groove pattern 61a supports the filtration membrane 53 in each cell, suppresses the narrowing of the flow path of the liquid collection part 56 due to deformation of the filtration film 53, and allows a predetermined flow in the liquid flow groove 61b. A road can be secured.

  For this reason, when the membrane permeate that has passed through the filtration membrane 53 flows into the liquid collection part 56 through the liquid flow path 55, the liquid flow path 55 that receives the action of the flow path resistance adjusting means contacts the liquid collection part 56. By reducing the channel resistance in the liquid collection groove pattern 56a in the channel adjustment unit 57 in the nearest region, it is possible to ensure a state where the membrane permeate flows smoothly.

  Therefore, the membrane permeated liquid that permeates through the filtration membrane 53 and flows into the liquid flow passage 55 at a location close to the liquid collection portion 56, that is, the upper portion of the membrane cartridge 51, and a location away from the liquid collection portion 56, that is, the membrane cartridge 51. It is possible to secure a state in which the membrane permeate that permeates the filtration membrane 53 and flows into the liquid flow passage 55 in the lower part of the filter flows smoothly to the liquid collection part 56. Therefore, the entire membrane surface of the filtration membrane 53 can be effectively used for filtration due to the effect of equalizing the transmembrane differential pressure acting on the filtration membrane 53 over the entire membrane surface.

  Further, since the liquid flow groove 61b of the liquid flow groove pattern 61a forms an oblique flow path toward the liquid collection section 56 and the flow path adjustment section 57, the filtrate is guided to the liquid collection section 56 and the flow path adjustment section 57. It becomes easy. Since the flow channel 61b has a non-linear flow channel configuration, the strength of the filter plate 52 is greater than that of the linear flow channel, and the flow channel area can be set wide.

  Further, since the header forming part 62 communicates directly with the liquid collecting part 56 at the side of the filter plate 52, the tube for connecting each membrane cartridge and the header, which has been conventionally required, becomes unnecessary, and the tube has dust. It does not become a resistor with a large area due to entanglement, and there is no resistor against upward flow.

  For this reason, as shown in FIG. 10, in the case where a plurality of submerged membrane separators 100 are installed in the reaction tank 1, the height of the free board necessary for smoothly reversing the upward flow 6 is provided. And the distance L2 between the submerged membrane separation devices 100 necessary for smoothly reversing the ascending flow 6 into the descending flow 9 can be reduced, so that the immersion in a limited region of the reaction tank 1 is possible. It is possible to secure a sufficient distance L2 for smoothly reversing the upward flow 6 between the mold membrane separation apparatuses 100. Therefore, the flow direction of the water flow in the reaction tank 1 can be made uniform, and as a result, the cleaning action of the upward flow on the membrane surface becomes uniform.

  In addition, since the distance L2 between the submerged membrane separation devices 100 necessary for smoothly reversing the upward flow 6 to the downward flow 9 can be reduced, the immersion type is limited within the limited region of the reaction vessel 1. A plurality of submerged membrane separators 100 are arranged in the center of the reaction vessel 1 while ensuring a sufficient distance L2 for smoothly reversing the upward flow 6 between the membrane separators 100, and the reaction vessel A region where the submerged membrane separator 100 does not exist can be set large on one end side.

  For this reason, since there is no resistance that inhibits the flow of the downward flow 9 in the region where the submerged membrane separator 100 does not exist, the cleaning action of the upward flow 6 on the membrane surface becomes uniform as a result, and the stability of the submerged membrane separator is reduced. A continuous use period can be lengthened and the motive power which produces the upward flow 6 can be reduced.

  FIG. 8 shows another embodiment of the membrane cartridge 51 according to the present invention, in which a bypass channel 55 a is formed in the filter plate 52. The bypass channel 55a is formed on one side of the filter plate width direction along the vertical direction of the filter plate 52, and protrudes from the filter plate surface of the filter plate 52 and is formed in parallel with one side of the filter plate width direction. Are formed between the convex portions 55b. There may be a plurality of convex portions 55b.

In this bypass flow path 55a, the convex portion 55b is in close contact with the filtration membrane 53 and becomes a barrier, so that the membrane permeate does not flow beyond the convex portion 55b.
For this reason, as shown in FIG. 9, the bypass flow channel 55 a is separated from the adjacent region A of the adjacent liquid flow channel 55 by the convex portion 55 b and is not communicated, and one end faces the liquid collection unit 56. Opened, and the other end opens toward the far region B of the liquid flow path 55 separated from the liquid collection part 56. The convex portion 55 b may be connected to the liquid collecting portion 56, and a predetermined distance may be provided between the convex portion 55 b and the liquid collecting portion 56. The bypass channel 55a can also be formed in a tunnel shape inside the filter plate 52.

  By the way, in the membrane cartridge 51 of the present embodiment, the liquid flow path 55 is hydraulically divided into the near area A and the far area B, but the far area B is further divided into a plurality of areas. It is also possible to provide a bypass channel 55a for each. It is also possible to provide a physical barrier between the near area A and the far area B.

  With the configuration described above, out of the membrane permeate that passes through the filtration membrane 53 and flows through the liquid flow passage 55, the membrane permeate that flows in the near region A near the liquid collection portion 56 does not pass through the bypass flow passage 55a. It flows into the part 56. On the other hand, at least a part of the membrane permeate flowing through the filtration membrane 53 and flowing in the far region B far from the liquid collecting portion 56 of the liquid flow path 55 is bypassed without joining the membrane permeate flowing in the near region A. It flows into the liquid collection part 56 through the flow path 55a.

  Thus, the membrane permeate that permeates through the filtration membrane 53 and flows into the fluid passage 55 by ensuring that the membrane permeate in the far region B flows smoothly to the liquid collection part 56 by the bypass passage 55a. Is divided into portions, and the collection of the flow through which the membrane permeate flows is performed to suppress the increase in the channel resistance of the liquid flow channel 55 that is generated by the concentration of the membrane permeate. it can.

  Therefore, the increase in the channel resistance is suppressed without increasing the number of the liquid collecting portions 56, and the effect of trying to equalize the transmembrane differential pressure acting on the filtration membrane 53 over the entire surface of the membrane is separated from the liquid collecting portion 56. The entire membrane surface of the filtration membrane 53 can be used for filtration by effectively utilizing the region of the filtration membrane 53.

  As a result, the phenomenon that the permeation flux becomes higher in the region closer to the liquid collecting portion 56 can be reduced. When the set flow rate per membrane cartridge 51 is the same as that of the conventional membrane cartridge, the membrane surface becomes dirty. A difficult state can be maintained.

  Further, by dividing (dispersing) the membrane permeate through the bypass channel 55a, there may be a plurality of small membrane cartridges in one large membrane cartridge 51, or actually one liquid collection. Despite having only the portion 56, it is possible to obtain an effect as if liquid collecting portions exist at a plurality of locations.

  Further, by forming the bypass channel 55a on one side of the filter plate width direction along the vertical direction of the filter plate 52, the ratio of the convex portion 55b in the width direction of the membrane surface can be minimized, It can be suppressed that the convex part 55b inhibits the flow of the upward flow along the film | membrane surface of the film | membrane cartridge 51 to the minimum.

  Further, since the liquid flow groove 61b forms an oblique flow path toward the liquid collection section 56 or the inlet of the bypass flow path 55a, the filtrate is the inlet of the liquid collection section 56, the flow path adjustment section 57, and the bypass flow path 55a. It becomes easy to be guided to.

  Further, in the liquid passage groove 61b, the path from the point where the filter plate 52 is located to the liquid collecting part 56 is longer than that in which the flow path is linearly formed, and the flow path resistance is increased. For this reason, when the bypass channel 55a is not provided, the disadvantage of the liquid passage groove 61b is increased. However, by providing the bypass channel 55a, the path through the liquid passage groove 61b is shortened, and the pressure loss can be reduced.

(A) The front view which shows the filter plate of the membrane cartridge in embodiment of this invention, (b) The enlarged view of a flow-path adjustment part. Sectional drawing which shows the filter-plate thickness part of the filter plate of the membrane cartridge in the embodiment (A) Sectional drawing which shows the header formation part of the membrane cartridge in the embodiment, (b) Sectional drawing which shows the filter plate of the membrane cartridge (A) The front view which shows the header formation part in other embodiment of this invention, (b) The side view The enlarged view which shows the honeycomb-shaped liquid flow groove pattern of the film | membrane cartridge in embodiment of this invention The enlarged view which shows the honeycomb-shaped liquid flow groove pattern of the film | membrane cartridge in other embodiment of this invention. (A) An enlarged view showing a honeycomb-shaped liquid flow groove pattern of a membrane cartridge according to another embodiment of the present invention, (b) A honeycomb-shaped liquid flow groove pattern of a film cartridge according to another embodiment of the present invention. Enlarged view The front view which shows the filter plate of the membrane cartridge in other embodiment of this invention Schematic diagram of the membrane cartridge shown in FIG. The schematic diagram which shows the arrangement structure of the immersion type membrane separator of this invention (A) Front view showing structure of filter plate of conventional membrane cartridge, (b) Side view Schematic diagram showing a conventional immersion membrane separator Explanatory drawing which shows the effect | action of the conventional immersion type membrane separator

Explanation of symbols

51 Membrane Cartridge 52 Filter Plate 52a Through Hole 52b Filter Plate Thickness 52c Filter Plate Connection Protrusion 52d Filter Plate Connection Depression 53 Filtration Membrane 53a Micro Recess 54 Fixing Portion 55 Liquid Flow Channel 55a Bypass Channel 55b Projection 56 Liquid collection part 56a Liquid collection groove pattern 56b Liquid collection groove 56c Mountain part 57 Flow path adjustment part 60 Header 61a Liquid passage groove pattern 61b Liquid passage groove 61c Hexagonal cell 61d Diamond shaped cell 61h Semi-circular fan shaped cell 61i Large Circular cell 61j Small circular cell 62 Header forming part 62a Header flow path part 62b Header thick part 62c Header connection convex part 62d Header connection recess part 62e O ring groove 62f O ring 62g Die hole 62h Plug body 70 Filtration unit 71 Side wall 80 Air diffuser 91 Connecting hole 92 Connecting rod 100 Immersion Type membrane separation apparatus 100a diffuser casing

Claims (4)

A membrane cartridge in which a filtration membrane is disposed on the surface of a filter plate, and a liquid collecting part communicating with a liquid flow path between the filtration membrane and the filter plate is provided at a predetermined position of the filter plate, and covers the filtration membrane. A flow channel network consisting of liquid passage grooves is formed in a predetermined liquid passage groove pattern on the broken filter plate surface, and the liquid passage groove pattern has a shape in which the liquid passage grooves intermittently exist on an arbitrary straight line on the filter plate surface. A membrane cartridge characterized by comprising: The filter plate has liquid passage groove patterns on the front and back filter plate surfaces, and the position where both liquid passage groove patterns are shifted in a state where the liquid passage groove pattern formed on one filter plate surface is projected onto the other filter plate surface. The membrane cartridge according to claim 1, wherein the membrane cartridge is present in the cartridge. The filter plate has liquid passage groove patterns on the front and back filter plate surfaces, and the position where both liquid passage groove patterns are shifted in a state where the liquid passage groove pattern formed on one filter plate surface is projected onto the other filter plate surface. The same direction component in the liquid flow groove pattern formed on one filter plate surface and the liquid flow groove pattern formed on the other filter plate surface does not exist on the same straight line. A membrane cartridge according to claim 1. The membrane cartridge according to any one of claims 1 to 3, wherein the liquid passage groove pattern of the channel network has a honeycomb shape.

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