Filter press type dialysis devices and stacks

Abstract

The present invention provides a filter-press dialysis device capable of preventing ion exchange membranes and gaskets from shifting in a direction perpendicular to the stacking direction of a stacked product, and a stacking component constituting the filter-press dialysis device. The filter-press dialysis device comprises: a dialysis cell; a stacking component having a pair of fastening frames disposed on either side of the stacking direction of a stack formed by alternating ion exchange membranes and gaskets; and a press for fastening the dialysis cell in the stacking direction of the stack using fixed and movable pressure plates. The stacking component includes an anti-drifting member that prevents the ion exchange membranes and gaskets from shifting in a direction perpendicular to the stacking direction of the stack. The stacking component is suitable for the dialysis device.

Description

Technical Field

[0001] The present invention relates to a filter press type dialysis device and a stack used in a filter press type dialysis device. Background Art

[0002] In the past, a filter press type dialysis device has been known, which includes: a dialysis cell, which includes a stacking member with a pair of fastening frames arranged on both sides of the stacking direction of a stack formed by alternatingly stacking ion exchange membranes and gaskets; and a press, which uses a fixed pressure plate and a movable pressure plate to clamp the dialysis cell and has a pushing member that pushes from the movable pressure plate side to tighten in the stacking direction.

[0003] As a filter press type dialysis device, for example, an electrodialysis device is known, which includes an electrodialysis cell having a stack of cation exchange membranes and anion exchange membranes alternately arranged with gaskets between a pair of electrodes to form a desalting chamber and a concentrating chamber. By supplying a treated liquid containing salt to the desalting chamber and passing a direct current through the pair of electrodes, salt is removed from the treated liquid to generate a treated liquid (desalted liquid and concentrated liquid) (for example, see Patent Documents 1 and 2).

[0004] In addition, as another example of a filter press type dialysis device, for example, a diffusion dialysis device is known for recovering acid, comprising a dialysis tank having a chamber for supplying a treated liquid (acid waste liquid) and a chamber for supplying water, wherein an anion exchange membrane and a gasket are alternately arranged and a plurality of stacked members are stacked. The effective acid contained in the acid waste liquid is allowed to diffuse toward the water side through the anion exchange membrane according to the concentration difference, thereby recovering the effective acid (for example, see Patent Document 3).

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2014-14776

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 2016-209865

[0007] Patent Document 3: Japanese Patent Application Laid-Open No. 2016-221507 Summary of the Invention

[0008] Problems to be solved by the invention

[0009] In the dialysis devices described in Patent Documents 1 to 3, a dialysis cell is sandwiched between a fixed pressure plate and a movable pressure plate of a press having a pressing member. The pressing member is pressed from the movable pressure plate to tighten a stack of ion exchange membranes and gaskets in the stacking direction. When a predetermined appropriate tightening pressure is reached, the pressing member is fixed to secure the ion exchange membranes and gaskets. The gaskets constituting the stack are made of rubber or resin, and their dimensions vary in the thickness direction (the stacking direction) due to various factors, including seasonal temperature fluctuations at the installation location, thermal effects of the circulating liquid temperature, the effects of ultraviolet radiation from sunlight, and the effects of the circulating liquid chemical.

[0010] Particularly during the operation of an electrodialysis device, in order to reduce the electrical resistance of the treated liquid and prevent excessive temperature increases due to heat generation from the ion exchange membranes, the temperature of the treated liquid is adjusted, for example, to approximately 30°C. This acts on the stack as a whole to cause it to expand, causing the surface pressure of the stack, including the ion exchange membranes and gaskets, to increase. This increase in surface pressure is not limited to the operation of the dialysis device; it can also occur during periods of inactivity, such as when the installation location is exposed to high temperatures in the summer. An excessive increase in the surface pressure of the stack, including such a stack, can cause the ion exchange membranes and gaskets to shift in a direction perpendicular to their stacking direction. This shift can cause deformation in the flow path for the treated liquid or the desalinated treated liquid, which is formed in the direction of the ion exchange membranes and gaskets. Once such a shift occurs, there is a problem: the shift is further amplified by the pump pressure used to operate the treated liquid and the treated liquid.

[0011] Moreover, when the dialysis device is stopped and the treated liquid and the treatment liquid are extracted from the dialysis tank, when the dialysis device is placed in an environment where the temperature of the installation site is reduced (during the winter closure period, etc.), the dialysis device cools down as a whole and the gasket shrinks. As a result, even if the dialysis tank is fastened and fixed with a prescribed appropriate fastening pressure using a press in advance, the fastening pressure applied to the ion exchange membrane and the gasket constituting the stack will be reduced, and the stacked ion exchange membrane and the gasket will fall downward or deviate and protrude in the lateral direction. When the ion exchange membrane and the gasket are offset in this way, the flow path formed by the ion exchange membrane and the gasket in the stacking direction will be deformed, the treated liquid and the treatment liquid will not be able to flow properly, the flow path resistance of the treated liquid and the like flowing in the flow path will increase, and a burden will be placed on the pump power, and ultimately the function of the dialysis device will not be fully exerted. Moreover, when the above-mentioned deviation between the ion exchange membrane and the gasket occurs, the following problem occurs: the operation cannot be carried out unchanged, and the ion exchange membrane and the gasket need to be reassembled including the disassembly of the fastening frame, which greatly reduces the productivity of the dialysis device.

[0012] It is believed that the offset between the ion exchange membrane and the gasket constituting the above-mentioned stack is affected by various reasons such as the temperature change at the installation site caused by seasonal changes, the thermal influence of the circulating liquid temperature, the influence of ultraviolet rays from sunlight, the influence of the chemical solution in the circulating liquid, etc., and is also affected by the assembly accuracy when assembling the ion exchange membrane and the gasket, making it difficult to predict whether such an offset will occur.

[0013] The present invention is made in view of the above-mentioned actual situation, and its main technical problem is to provide a filter press type dialysis device and a stacking part constituting the filter press type dialysis device that can prevent the ion exchange membrane and gasket from shifting in a direction orthogonal to the stacking direction of the stacked materials.

[0014] Solutions for solving problems

[0015] In order to solve the above-mentioned main technical problems, according to the present invention, a filter press type dialysis device is provided, which includes: a dialysis cell, which has a stacking member with a pair of fastening frames arranged on both sides of the stacking direction of a stack formed by alternating stacking of ion exchange membranes and gaskets; and a press, which uses a fixed pressure plate and a movable pressure plate to fasten the dialysis cell in the stacking direction of the stack, wherein the stacking member includes an anti-drift component, which prevents the ion exchange membrane and the gasket from shifting in a direction orthogonal to the stacking direction of the stack.

[0016] In the filter press type dialysis device of the present invention, it is preferred that

[0017] The anti-deviating member abuts against a side surface of the stacked material in a direction perpendicular to the stacked direction, across the stacked direction of the stacked material, to prevent the stacked material from deviating in the lateral direction.

[0018] The anti-deviating member abuts against the bottom surface of the stack in a direction perpendicular to the stacking direction across the stacking direction of the stack, thereby preventing the stack from deviating in the longitudinal direction;

[0019] The deviation preventing member abuts against the side surfaces and bottom surface of the stacked object in a direction perpendicular to the stacked direction, across the stacking direction of the stacked objects, to prevent the stacked objects from deviating in the lateral and longitudinal directions.

[0020] Furthermore, in the filter press type dialysis device of the present invention, it is preferred that

[0021] The anti-deviating member includes a sliding mechanism that is retractable in the stacking direction of the stacked objects;

[0022] The filter press type dialysis device includes a drainage structure at a portion of the anti-drift member that faces the bottom surface of the stack;

[0023] The anti-deviating member is supported by the pair of fastening frames;

[0024] The anti-deviating member is supported by bolts connecting the pair of fastening frames;

[0025] The anti-deviating member is supported by a concave portion or a convex portion formed on the fastening frame;

[0026] The protrusion is a liquid pipe for introducing the processing liquid into the fastening frame;

[0027] A small gap is formed between the anti-drift member and the stack, and the small gap is set to a size within a range such that even if the ion exchange membrane and the gasket constituting the stack are shifted, a flow path of the treatment liquid formed by the ion exchange membrane and the gasket can be maintained, thereby allowing the operation of the dialysis device;

[0028] The dialysis cell is an electrodialysis cell having a structure in which the stack is provided between an anode and a cathode.

[0029] Moreover, according to the present invention, a stacking member is provided, which is applied to a filter press type dialysis device, the filter press type dialysis device having a press for fastening the dialysis cell using a fixed pressure plate and a movable pressure plate, wherein the stacking member is provided with a pair of fastening frames on both sides of the stacking direction of a stack formed by alternatingly stacking ion exchange membranes and gaskets, and the stacking member includes an anti-drifting component, which prevents the ion exchange membrane and the gasket from shifting in a direction orthogonal to the stacking direction of the stack.

[0030] In the stack of the present invention, it is preferred that

[0031] The anti-deviating member abuts against a side surface of the stacked material in a direction perpendicular to the stacked direction, across the stacked direction of the stacked material, to prevent the stacked material from deviating in the lateral direction.

[0032] The anti-deviating member abuts against the bottom surface of the stack in a direction perpendicular to the stacking direction across the stacking direction of the stack, thereby preventing the stack from deviating in the longitudinal direction;

[0033] The deviation preventing member abuts against the side surfaces and bottom surface of the stacked object in a direction perpendicular to the stacked direction, across the stacking direction of the stacked objects, to prevent the stacked objects from deviating in the lateral and longitudinal directions.

[0034] Effects of the Invention

[0035] The filter press type dialysis device of the present invention includes: a dialysis cell, which has a stacking member with a pair of fastening frames arranged on both sides of the stacking direction of a stack formed by alternating stacking of ion exchange membranes and gaskets; and a press, which uses a fixed pressure plate and a movable pressure plate to fasten the dialysis cell in the stacking direction of the stack, wherein the stacking member includes an anti-drift component, which prevents the ion exchange membrane and the gasket from shifting in a direction orthogonal to the stacking direction of the stack, thereby preventing the ion exchange membrane and the gasket from shifting in a direction orthogonal to the stacking direction of the stack constituting the stacking member.

[0036] In addition, the stacking member of the present invention is applied to a filter press type dialysis device, which is equipped with a press for fastening the dialysis cell using a fixed pressure plate and a movable pressure plate, wherein the stacking member is provided with a pair of fastening frames on both sides of the stacking direction of a stack formed by alternatingly stacking ion exchange membranes and gaskets, and the stacking member includes an anti-drifting component that prevents the ion exchange membrane and the gasket from shifting in a direction orthogonal to the stacking direction of the stack, thereby preventing the ion exchange membrane and the gasket from shifting in a direction orthogonal to the stacking direction of the stack constituting the stacking member. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a perspective view of a filter press type dialysis device according to this embodiment.

[0038] Figure 2 It means Figure 1 An exploded perspective view of a partially exploded stack of a filter press type dialysis device is shown.

[0039] Figure 3(a) is Figure 1FIG3( b ) is an exploded perspective view of a lateral deviation prevention member used in a filter press type dialysis device, and FIG3( b ) is a perspective view showing a state in which the lateral deviation prevention member shown in FIG3( a ) is assembled.

[0040] Figure 4(a) is viewed from the side Figure 1 FIG4(b) is a side view of the lower portion of a stack of components in which lateral and longitudinal deviation prevention components are installed in the filter press type dialysis device, and FIG4(b) is a partially removed and enlarged front view of the stack of components shown in FIG4(a).

[0041] FIG5(a) is a perspective view showing another embodiment of the lateral deviation preventing member and the longitudinal deviation preventing member, and FIG5(b) is a side view of FIG5(a) as seen from the side.

[0042] Figure 6(a) is a decomposed stereoscopic view showing an embodiment of the one-piece anti-deviation component, Figure 6(b) is a stereoscopic view showing the state of the one-piece anti-deviation component shown in Figure 6(a) being assembled, and Figure 6(c) is a main view showing a portion of the stacking part on which the one-piece anti-deviation component shown in Figure 6(b) is installed, taken out and observed from the front.

[0043] Description of Reference Numerals

[0044] 1. Filter-press electrodialysis device; 20. Dialysis cell; 22. Anode frame; 24. Cathode frame; 30, 40. Stacking member; 31, 41. Fastening frame; 31a. Concentrate pipe; 311, 411. Fastening hole; 32, 42. Cation exchange membrane; 33, 43. Desalination chamber gasket; 34, 44. Anion exchange membrane; 35, 45. Concentrate chamber gasket; 36, 46. Fastening frame; 36a. Desalination pipe; 361, 461. Fastening hole; 37, 47. Bolt; 38, 48. Stack; 50. Press; 51, 52. Vertical mounting portion; 53. Hydraulic press support; 54. Fixing Pressure plate; 55, side rod; 56, hydraulic press; 561, hydraulic pump; 562, pushing member; 57, movable pressure plate; 571, shoulder portion; 572, vertical wall; 110, lateral deviation prevention member; 111, bottom plate; 112, saddle belt; 113, first guide plate; 114, slide plate; 115, second guide plate; 120, longitudinal deviation prevention member; 122, through hole; 130, lateral deviation prevention member; 140, longitudinal deviation prevention member; 142, through hole; 160, integrated anti-drift member; 161, bottom plate; 166, connecting portion; 167, horizontal plate; 167a, inclined surface. DETAILED DESCRIPTION

[0045] Hereinafter, embodiments of a filter press type dialysis device and a stack constituting the filter press type dialysis device according to the present invention will be described in detail with reference to the accompanying drawings.

[0046] Figure 1 FIG. 1 shows a filter press electrodialysis device 1 as one embodiment of the filter press dialysis device of the present invention. The filter press electrodialysis device 1 of this embodiment is a dialysis device that removes salt from a treated liquid to generate a desalted liquid and a concentrated liquid. Figure 1 As shown, the filter press electrodialysis device 1 includes a dialysis cell 20 and a press 50 for clamping, fastening, and pressing the dialysis cell 20 .

[0047] like Figure 1 As shown, the dialysis cell 20 includes two stacks 30, 40. The stacks 30, 40 respectively include laminates 38, 48 formed by alternating layers of ion exchange membranes and gaskets. Figure 2 The figure shows a partial exploded view of the stack 30. The stack 30 includes a stack 38, which is formed by stacking a plurality of stacks (e.g., 110 stacks) of components, each consisting of a cation exchange membrane 32, a desalination chamber gasket 33, an anion exchange membrane 34, and a concentration chamber gasket 35, in the X-axis direction indicated by arrow X in the figure. A pair of fastening frames 31 and 36 are positioned on either side of the stack 38 in the stacking direction to hold the stack. Although not shown, flow paths are formed between the cation exchange membrane 32, the desalination chamber gasket 33, the anion exchange membrane 34, and the concentration chamber gasket 35. These flow paths are arranged to communicate with each other without deviation and serve to allow the treated liquid and the processing liquid to pass through in the stacking direction.

[0048] The fastening frame 31 has a plurality of fastening holes 311 formed along its outer circumference, and the fastening frame 36 has a plurality of fastening holes 361 formed along its outer circumference. The fastening holes 311 and 361 are through-holes having a diameter larger than that of the bolts 37. Bolts 37 are inserted through the fastening holes 311 and 361, and the fastening frames 31 and 36 are connected using appropriate nuts and washers, thereby fastening the stack 38 and integrating the stack 38. Furthermore, stud bolts, for example, are used as the bolts 37. A concentrate pipe 31a is formed at the lower end of the inner side surface of the fastening frame 31 (the surface facing the other fastening frame 36). This concentrate pipe 31a extends along the Y-axis in the figure and has a convex shape in the X-axis direction, serving as the inlet for the concentrate. A desalted liquid pipe 31b is formed above the inner side surface of the fastening frame 31. This desalted liquid pipe 31b extends along the Y-axis and serves as the outlet for the desalted liquid. In addition, a desalting liquid pipe 36a is formed below the inner side surface of the fastening frame 36 (the surface opposite to the fastening frame 31 on one side). The desalting liquid pipe 36a extends in the Y-axis direction and is convex in the X-axis direction. It serves as the inlet of the desalting liquid. A concentrated liquid pipe 36b is formed above the inner side surface of the fastening frame 36. The concentrated liquid pipe 36b extends in the Y-axis direction and serves as the outlet of the concentrated liquid.

[0049] Moreover, a lateral deviation prevention component 110 is provided in the stacking member 30 in a direction perpendicular to the stacking direction of the stack 38. The lateral deviation prevention component 110 functions as an anti-drifting component for preventing the ion exchange membrane (cation exchange membrane 32, anion exchange membrane 34) and the gasket (gasket 33 for the desalination chamber, gasket 35 for the concentration chamber) from deviating in the lateral direction (Y-axis direction).

[0050] The lateral displacement preventing member 110 abuts against the side of the stack 38 across the stacking direction of the stack 38, thereby preventing the ion exchange membranes and gaskets constituting the stack 38 from shifting in the lateral direction. As shown in the exploded view of FIG3(a), the lateral displacement preventing member 110 includes: a substantially U-shaped base plate 111 having an opening in the lateral direction; a first guide plate 113 fixed to the near-front end of the base plate 111; a saddle belt 112 disposed on the first guide plate 113; a slide plate 114 capable of sliding toward the opening of the base plate 111 in the direction indicated by the arrow and integrally connected to the base plate 111; a second guide plate 115 fixed to the end of the slide plate 114; and a saddle belt 112 disposed on the second guide plate 115. 3 (b) as shown in the assembled lateral deviation preventing member 110 includes a slide mechanism 114 relative to the bottom plate 111 in the direction indicated by the arrow D4 in the figure forward and backward, and can freely adjust the width. Figure 2 As shown, the lateral displacement preventing member 110 is secured to the bolts 37 via two saddle straps 112, 112. The stack 30, while secured with the lateral displacement preventing member 110 via the bolts 37, is integrated by clamping and fastening the stacked object 38 between a pair of fastening frames 31, 36. In the illustrated embodiment, the lateral displacement preventing member 110 is secured to the sides of the stacked object 38 of the stack 30 using three bolts 37 located at the top, bottom, and center of the fastening frames 31, 36, out of the five bolts 37 fastening the fastening frames 31, 36. The number of lateral displacement preventing members 110 provided is not limited to this; for example, the number may correspond to all bolts 37, or two may be provided at the top and bottom, and the number can be appropriately selected based on needs.

[0051] Omit detailed description, such as Figure 1As shown, stack 40 also has a structure substantially similar to stack 30 described above, including a stack 48. This stack 48 is formed by stacking a plurality of (e.g., 110) sets of components formed into a thin sheet-like cation exchange membrane 42, a desalination chamber gasket 43, an anion exchange membrane 44, and a concentration chamber gasket 45 in the X-axis direction. A pair of fastening frames 41 and 46 are positioned on either side of the stack in the stacking direction, sandwiching stack 48. Fastening frame 41 has a plurality of fastening holes 411 formed along its outer periphery, while fastening frame 46 also has a plurality of fastening holes 461 formed along its outer periphery. The fastening holes are used to fasten the pair of fastening frames 41 and 46 together using bolts 47 and appropriate nuts and washers (not shown), thereby securing stack 48. On the side of the stacked object 48 constituting the stack 40, the lateral displacement prevention member 110 is also held by three bolts 47 disposed at the upper end, the lower end, and the center, among the five bolts 47 fastening the fastening frames 41 and 46. Figure 1 In the figure, the opposite side of the stacking members 30 and 40 is not shown, but similarly to the front side, the lateral deviation prevention members 110 are provided at three locations in the vertical direction.

[0052] The side surfaces of the fastening frames 31 and 36 of the stacking member 30 are formed with shoulder portions 312 and 362 extending along the Y-axis direction in the figure. The side surfaces of the fastening frames 41 and 46 are formed with shoulder portions 412 and 462 extending along the Y-axis direction in the figure. The heights of the fastening holes formed in the stacking members 30 and 40 are prepared in two levels in each stacking member, and fastening holes of different heights are used in adjacent stacking members. In addition, in this embodiment, the dialysis cell 20 is composed of two stacking members (stacking member 30 and stacking member 40), but the present invention is not limited to this, and may also include one or more stacking members.

[0053] The dialysis cell 20 of this embodiment is formed by arranging the two stacking members 30 and 40 in an adjacent manner, with an anode frame 22 for holding the anode arranged on the fastening frame 46 side of the stacking member 40, and a cathode frame 24 for holding the cathode arranged on the fastening frame 31 side of the stacking member 30, forming a so-called electrodialysis cell.

[0054] Reference Figure 1The press 50 is described. The press 50 includes: a pair of upright setting parts 51, 52; a hydraulic press support part 53, which is horizontally arranged on the upper part of the upright setting part 51 on one side (near the front side); a fixed pressure plate 54, which is located opposite to the upright setting part 51 and supported by the upright setting part 52 on the other side; a pair of side rods 55, 55, which connect the hydraulic press support part 53 and the fixed pressure plate 54 in the X-axis direction (horizontal direction); a hydraulic press 56, which is supported by the hydraulic press support part 53; and a movable pressure plate 57, which is arranged in the area sandwiched by the pair of side rods 55, 55. In addition, in Figure 1 , a portion of the side rod 55 near the front side is shown in perspective.

[0055] The hydraulic press 56 includes a hydraulic pump 561 and a pressing member 562. The hydraulic pump 561 is driven by an electric motor (not shown), and the hydraulic pressure supplied from the hydraulic pump 561 causes the pressing member 562 to extend in the X-axis direction. The movable pressure plate 57 includes a pair of shoulder portions 571, 571 on the side surface in the Y-axis direction indicated by the arrow Y, and is supported by a pair of side rods 55, 55 via the shoulder portions 571, 571. The lower end of the movable pressure plate 57 does not contact the installation surface of the press 50. In addition, the shoulder portions 571, 571 are not fixed to the side rods 55, 55. Therefore, by using the pressing member 562 of the hydraulic press 56 to press the vertical wall 572 of the movable pressure plate 57, the shoulder portions 571, 571 can slide on the side rods 55, 55, thereby moving the movable pressure plate 57 toward the fixed pressure plate 54.

[0056] When the filter press electrodialysis device 1 of this embodiment is to be operated, if the stack members 30 and 40 are prepared, Figure 1 As shown, the stacks 30 and 40 are fed into an area sandwiched between a pair of side bars 55 and 55 of the press 50, the fixed pressure plate 54, and the movable pressure plate 57. The shoulders 312 and 362 provided on the fastening frames 31 and 36 of the stack 30 and the shoulders 412 and 462 provided on the fastening frames 41 and 46 of the stack 40 are placed on the pair of side bars 55 and 55. At this time, since the lower ends of the stacks 30 and 40 do not contact the installation surface of the filter press electrodialysis device 1, the stacks 30 and 40 can be moved in the X-axis direction along the pair of side bars 55 and 55.

[0057] As described above, when the stacks 30 and 40 are fed into the press 50, the hydraulic pump 561 of the hydraulic press 56 is activated, causing the pressing member 562 to extend in the direction indicated by arrow D1 and abut against the vertical wall 572 of the movable pressure plate 57, thereby pressing the movable pressure plate 57 in the direction indicated by arrow D2. As a result, the stacks 30 and 40 are tightened in the stacking direction (X-axis direction), and the dialysis cell 20 as a whole is compressed.

[0058] The appropriate tightening pressure when tightening the dialysis cell 20 using the press machine 50 of this embodiment is set to 0.6 N / mm. 2 ±0.1N / mm 2 When the pushing member 562 is extended in the direction indicated by arrow D1 and the dynamic pressure plate 57 is pushed in the direction indicated by arrow D2, the distance between the pair of fastening frames 31 and 36 decreases as the tightening pressure increases. As shown in Figure 4(a), the distance between the pair of fastening frames 31 and 36 when the tightening pressure is appropriate is, for example, W (mm). As described above, the lateral displacement prevention member 110 includes a sliding mechanism that allows the slide plate 114 to advance and retreat in the width direction relative to the base plate 111, allowing for free adjustment of the width. Therefore, the width of the lateral displacement prevention member 110 can be adjusted to W (mm). As a result, in addition to Figure 4(a), Figure 4(b) also shows that the lateral displacement prevention member 110, which is retained by the bolt 37 via the rubber 372, abuts the side surface of the stack 38 of the stack 30 across the entire width W (mm) in the stacking direction.

[0059] Furthermore, in this embodiment, as described above, the dialysis cell 20 is pressed by the press machine 50 to tighten the stacked objects 38 and 48 with appropriate pressure, and after the pressing member 562 is fixed, the longitudinal displacement preventing member 120 is inserted and arranged at a position where it contacts the bottom surface of the stacked objects 38 and 48 in the direction perpendicular to the stacking direction of the stacking members 30 and 40. Figure 1 As shown, the longitudinal deviation prevention member 120 is a rectangular plate-shaped member, for example, made of a thermoplastic or thermosetting resin such as PVC or PE. Furthermore, the longitudinal deviation prevention member 120 is formed with a plurality of through-holes 122 (nine in this embodiment) extending through the thickness direction, which function as a drainage structure. By providing these through-holes 122, even if the treated liquid or the processing liquid leaks from between the ion exchange membrane and the gasket onto the longitudinal deviation prevention member 120, it can be discharged to the outside through the through-holes 122. This prevents precipitates such as salt from accumulating on the longitudinal deviation prevention member 120, causing the anode frame 22 and the cathode frame 24 to be connected and short-circuited. Furthermore, the drainage structure provided on the longitudinal deviation prevention member 120 is not limited to the above-mentioned through-holes 122. For example, a groove for draining the leaked liquid may be formed across the entire length of the surface of the longitudinal deviation prevention member 120, or the through-holes 122 may be combined with the groove, or an appropriate inclined surface may be formed.

[0060] When installing the above-mentioned longitudinal deviation preventing member 120, after confirming that the interval between the fastening frames 31 and 36 is W (mm), the longitudinal deviation preventing member 120 having a width dimension of W (mm) is prepared. Figure 1 As shown, the longitudinal misalignment prevention member 120 is inserted and placed from the side onto the concentrate tube 31a and the desalted liquid tube 36a. The concentrate tube 31a forms a convex portion at the lower end of the inner side surface of the fastening frame 31 and extends in the Y-axis direction. The desalted liquid tube 36a forms a convex portion at the lower end of the inner side surface of the fastening frame 36 and extends in the Y-axis direction, serving as the inlet for the desalted liquid. As shown in FIG4(a), the thickness of the longitudinal misalignment prevention member 120 is set so that when the longitudinal misalignment prevention member 120 is inserted and placed onto the concentrate tube 31a formed in the fastening frame 31 and the desalted liquid tube 36a formed in the fastening frame 36, the surface of the longitudinal misalignment prevention member 120 just contacts the lower surface of the stack 38. In addition, in this embodiment, the longitudinal deviation prevention member 120 is placed on the concentrate tube 31a and the desalination liquid tube 36a. However, when the distance between the lower end of the stack 38 and the concentrate tube 31a and the desalination liquid tube 36a is large, it is also possible to form a protrusion for placing the longitudinal deviation prevention member 120 on both the fastening frames 31 and 36.

[0061] Furthermore, in the present invention, the lateral misalignment prevention member 110 or the longitudinal misalignment prevention member 120 is not limited to being in direct contact with the side or bottom surface of the stack 38 in a direction perpendicular to the stacking direction. A slight gap may exist between the lateral misalignment prevention member 110 or the longitudinal misalignment prevention member 120 and the ion exchange membranes and gaskets that constitute the stack 38. Specifically, the lateral misalignment prevention member 110 or the longitudinal misalignment prevention member 120 of the present invention functions to prevent slight misalignment of the ion exchange membranes and gaskets that constitute the stack 38, and to prevent misalignment to the extent that reassembly, including stacking of the ion exchange membranes and gaskets, is necessary. More specifically, the small gap formed by the anti-drifting members (lateral anti-drifting member 110, longitudinal anti-drifting member 120) and the stack 38 is set to a size within a range such that, even if the ion exchange membrane and gasket constituting the stack 38 deviate within the range of the small gap, the flow path between the treated liquid and the treated liquid formed by the ion exchange membrane and the gasket is maintained, allowing operation of the dialysis device. Furthermore, the small gap is preferably 5 mm or less.

[0062] The inventors of the present invention used the above-mentioned filter press electrodialysis device 1 equipped with the lateral deviation prevention member 110 and the longitudinal deviation prevention member 120, and the same type of filter press electrodialysis device not equipped with the above-mentioned lateral deviation prevention member 110 and the longitudinal deviation prevention member 120, to implement the operation of generating concentrated liquid and desalted liquid from the treated liquid containing salt for a certain period of time. Before entering the winter shutdown period of about one week, the treated liquid and the treated liquid were extracted from each electrodialysis device, and each electrodialysis device was placed. After the winter shutdown period ended, the degree of deviation between the ion exchange membrane and the gasket constituting the stack of each electrodialysis device was checked.

[0063] According to the above test results, in a filter press electrodialysis device that is not equipped with a lateral deviation prevention member 110 and a longitudinal deviation prevention member 120, multiple ion exchange membranes and gaskets near the center of the stacks 38 and 48 that constitute the stacking members 30 and 40 fall off to the lower side, and deviation and protrusion between the ion exchange membranes and the gaskets also occur in the lateral direction. Therefore, in order to restart the next operation, it is necessary to disassemble the stacking members 30 and 40 and reassemble the stacking members 30 and 40. In contrast, in the filter press electrodialysis device 1 equipped with a lateral deviation prevention member 110 and a longitudinal deviation prevention member 120, although the gaskets contained in the stacks 38 and 48 have shrunk, no deviation has occurred in the longitudinal or lateral directions, and the stacking members 30 and 40 are able to maintain a good shape.

[0064] The present invention is not limited to the above-mentioned embodiment, and various modifications are included in the present invention. For example, in the above-mentioned embodiment, a sliding mechanism is formed in the lateral deviation prevention member 110, and in the process of compressing the dialysis cell 20 using the press 50 and setting it to an appropriate tightening pressure, the width of the lateral deviation prevention member 110 is adjusted in accordance with the interval W between the pair of tightening frames 31 and 36. In addition, for the longitudinal deviation prevention member 120, after compressing the dialysis cell 20 using the press 50 and setting it to an appropriate tightening pressure, the interval W between the tightening frame 31 and the tightening frame 36 is measured, and a longitudinal deviation prevention member 120 of width W is prepared in accordance with the measured interval W, and the longitudinal deviation prevention member 120 is inserted and placed from the side. However, the present invention is not limited to this.

[0065] For example, if it is anticipated that the spacing between the pair of fastening frames will be approximately W (mm) when the dialysis cell 20 is fastened using a press 50 with an appropriate tightening pressure, as shown in Figures 5(a) and 5(b), plate-shaped lateral and longitudinal anti-drift members 130 and 140 are provided in place of the aforementioned lateral and longitudinal anti-drift members 110 and 120. The width of the lateral and longitudinal anti-drift members 130 and 140 is set to W + 2D (mm), which is the width of the aforementioned spacing W (mm) plus a predetermined reserve width of 2D (mm). To address this, longitudinally extending recesses are formed on the fastening frames 31 and 36 for the insertion of the lateral and longitudinal anti-drift members 130. More specifically, longitudinally extending grooves 316 and 366 are formed, and transversely extending grooves 314 and 364 are formed for the insertion of the longitudinal anti-drift member 140. The depth of each groove corresponds to the aforementioned reserve width 2D (mm), which is D + α (mm). By preparing the above-mentioned lateral deviation prevention member 130 and longitudinal deviation prevention member 140 in advance, the above-mentioned grooves 314, 364, 316, and 366 are formed, so that when it is desired to form a stacking member 30, the lateral deviation prevention member 130 and longitudinal deviation prevention member 140 can be pre-arranged between the grooves 314, 364 and between the grooves 316, 366 formed in a manner of W+2D+2α, and there is no need to adjust the width direction dimension in accordance with the interval W (mm) between the fastening frames 31 and 36. The lateral deviation prevention member 130 and longitudinal deviation prevention member 140 can be brought into contact with the side or bottom surface of the stack 38 in a direction perpendicular to the stacking direction across the entire area of ​​the stack 38 in the stacking direction.

[0066] Furthermore, in the above-mentioned embodiment, the lateral misalignment prevention member 110 and the longitudinal misalignment prevention member 120 are separately constructed. However, as shown in, for example, FIG6(a), FIG6(b), and FIG6(c), it is also possible to construct an integrated anti-misalignment member 160 in which the lateral misalignment prevention member and the longitudinal misalignment prevention member to be provided on the lower end side of the stack 38 are integrated. As shown in the partial exploded view of the integrated anti-misalignment member 160 in FIG6(a), the integrated anti-misalignment member 160 includes: a substantially U-shaped bottom plate 161 having an opening in the lateral direction; a first guide plate 163 fixed to the near-front end of the bottom plate 161; a saddle belt 162 provided on the first guide plate 163; and a slide plate 164 capable of being integrated with the bottom plate 161 by sliding in the direction indicated by the arrow toward the opening of the bottom plate 161. The integrated anti-deviation member 160 includes a second guide plate 165 fixed to the end of the slide plate 164, and a saddle belt 162 disposed on the second guide plate 165. The integrated anti-deviation member 160 further includes a connecting portion 166 extending downward from the center of the lower end of the base plate 161, and a horizontal plate 167 extending substantially horizontally from the lower end of the connecting portion 166. As can be seen from FIG6(c), the cross-section of the integrated anti-deviation member 160 is substantially L-shaped when viewed from the side. As shown in FIG6(c), the integrated anti-deviation member 160 assembled as shown in FIG6(b) is retained by the stud bolt 37 at the lower end via the two saddle belts 162, 162 and the rubber 372.

[0067] The horizontal plate 167 is the same as the above-mentioned longitudinal deviation prevention member 120, and is formed with a width dimension (W+2D (mm)) obtained by adding a prescribed reserve width 2D to the interval W (mm) when the stacking parts 30 and 40 are tightened with an appropriate tightening pressure. Grooves 314 and 364 extending in the horizontal direction as shown in Figure 5(a) are formed in the tightening frames 31 and 36, and the above-mentioned horizontal plate 167 is accommodated in the grooves 314 and 364. An inclined surface 167a descending in the direction indicated by the arrow D5 is formed on the upper surface of the horizontal plate 167. The upper side of the above-mentioned connecting portion 166 has the same function as the above-mentioned lateral deviation prevention member. As can be understood from Figure 6(c), it prevents the ion exchange membrane and the gasket from deviating in the lateral direction perpendicular to the stacking direction of the stack 38. In addition, the portion of the horizontal plate 167 formed on the lower side of the connecting portion 166, especially the corner formed by the connecting portion 166 and the horizontal plate 167, has a function roughly the same as the above-mentioned longitudinal deviation prevention component 120, and prevents the stack 38 from deviating downward by making the horizontal plate 167 abut against the bottom surface of the stack 38 perpendicular to the stacking direction, especially the corner 382 of the stack 38.

[0068] As described above, an inclined surface 167a is formed on the upper surface of the horizontal plate 167, which functions as a drainage structure that discharges the treated liquid and the processing liquid to the outside even if they leak out from between the ion exchange membrane and the gasket constituting the stack 38, thereby preventing a short circuit between the anode frame 22 and the cathode frame 24.

[0069] Furthermore, the above-described embodiment illustrates an example of the present invention being applied to a filter press electrodialysis device, but the present invention is not limited thereto. For example, the present invention can also be applied to a diffusion dialysis device including a dialysis cell having a stack of multiple anion exchange membranes arranged with spacers interposed therebetween. Any type of dialysis device can be applied as long as the dialysis cell comprises a stack with a pair of fastening frames disposed on either side of the stacking direction of the stack formed by alternating ion exchange membranes and spacers.

Claims

1. A filter press type dialysis device, comprising: A dialysis cell comprising a stacking member having a pair of fastening frames disposed on both sides in a stacking direction of a stack formed by alternately stacking ion exchange membranes and gaskets; and a press for fastening the dialysis cells in the stacking direction of the stack using a fixed pressure plate and a movable pressure plate, characterized in that The stack includes an anti-drift member that prevents the ion exchange membrane and the spacer from shifting in a direction orthogonal to a stacking direction of the stack, The anti-drifting member abuts against at least one of the side surfaces and the bottom surface of the stack in a direction perpendicular to the stacking direction across the stacking direction of the stack, thereby preventing the stack from shifting in a direction perpendicular to the stacking direction of the stack, or at least one of the side surfaces and the bottom surface of the stack in a direction perpendicular to the stacking direction, the anti-drifting member and the stack are formed to be opposite to each other with a small gap therebetween, and the small gap is set to a size within the following range: even if the ion exchange membrane and the gasket constituting the stack are shifted, the flow path of the treatment liquid formed by the ion exchange membrane and the gasket can be maintained, allowing the operation of the dialysis device.

2. The filter press type dialysis device according to claim 1, characterized in that The deviation preventing member abuts against a side surface of the stacked object in a direction perpendicular to the stacked direction, across the stacked direction of the stacked objects, to prevent the stacked objects from deviating in a lateral direction.

3. The filter press type dialysis device according to claim 1, characterized in that The deviation preventing member abuts against the bottom surface of the stacked objects in a direction perpendicular to the stacked direction, across the stacking direction of the stacked objects, to prevent the stacked objects from deviating in the longitudinal direction.

4. The filter press type dialysis device according to claim 1, characterized in that The deviation preventing member abuts against the side surfaces and bottom surface of the stacked object in a direction perpendicular to the stacked direction, across the stacking direction of the stacked objects, to prevent the stacked objects from deviating in the lateral and longitudinal directions.

5. The filter press type dialysis device according to any one of claims 1 to 4, characterized in that: The anti-deviating member includes a sliding mechanism that is extendable and retractable in the stacking direction of the stacked objects.

6. The filter press type dialysis device according to claim 3 or 4, characterized in that This filter press type dialysis device includes a drainage structure at a portion of the deviation prevention member facing the bottom surface of the stack.

7. The filter press type dialysis device according to any one of claims 1 to 4, characterized in that: The anti-deviating member is supported by the pair of fastening frames.

8. The filter press type dialysis device according to any one of claims 1 to 4, characterized in that: The anti-deviating member is supported by bolts connecting the pair of fastening frames.

9. The filter press type dialysis device according to any one of claims 1 to 4, characterized in that: The deviation prevention member is supported by a concave portion or a convex portion formed in the fastening frame.

10. The filter press type dialysis device according to claim 9, characterized in that: The protrusion serves as a liquid pipe for introducing a processing liquid into the fastening frame.

11. The filter press type dialysis device according to any one of claims 1 to 4, characterized in that: The dialysis cell is an electrodialysis cell having a structure in which the stack is provided between an anode and a cathode.

12. A stacking member used in a filter press type dialysis device having a press for fastening dialysis cells using a fixed pressure plate and a movable pressure plate, characterized in that: The stacking member is provided with a pair of fastening frames on both sides of the stacking direction of the stack formed by alternately stacking ion exchange membranes and gaskets. The stack includes an anti-drift member that prevents the ion exchange membrane and the spacer from shifting in a direction orthogonal to a stacking direction of the stack, The anti-drifting member abuts against at least one of the side surfaces and the bottom surface of the stack in a direction perpendicular to the stacking direction across the stacking direction of the stack, thereby preventing the stack from shifting in a direction perpendicular to the stacking direction of the stack, or at least one of the side surfaces and the bottom surface of the stack in a direction perpendicular to the stacking direction, the anti-drifting member and the stack are formed to be opposite to each other with a small gap therebetween, and the small gap is set to a size within the following range: even if the ion exchange membrane and the gasket constituting the stack are shifted, the flow path of the treatment liquid formed by the ion exchange membrane and the gasket can be maintained, allowing the operation of the dialysis device.

13. The stack according to claim 12, wherein: The deviation preventing member abuts against a side surface of the stacked object in a direction perpendicular to the stacked direction, across the stacked direction of the stacked objects, to prevent the stacked objects from deviating in a lateral direction.

14. The stack according to claim 12, wherein: The deviation preventing member abuts against the bottom surface of the stacked objects in a direction perpendicular to the stacked direction, across the stacking direction of the stacked objects, to prevent the stacked objects from deviating in the longitudinal direction.

15. The stack according to claim 12, wherein: The deviation preventing member abuts against the side surfaces and bottom surface of the stacked object in a direction perpendicular to the stacked direction, across the stacking direction of the stacked objects, to prevent the stacked objects from deviating in the lateral and longitudinal directions.

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