JP2023149145A - Method of treating water to be treated, method of producing ultrapure water, bilayer type resin tower, and device of producing ultrapure water - Google Patents

Abstract

To provide a method of treating water to be treated, capable of preventing deterioration of the quality of water to be treated flowing in a bilayer type resin tower.SOLUTION: The method of treating water to be treated comprises steps of forming a first packed layer 41 that comes in contact with water to be treated and includes first resin particles 41A in a cylindrical tower body 31, arranging a water-permeable partition member 50 formed of a material flexible to the extent of being able to elastically deform according to the weight of second resin particles 42A different from the first resin particles 41A, on the first packed layer 41 in a condition of not being restricted by the tower body 31, and forming a second packed layer 42 including the second resin particles 42A on the partition member 50. The water to be treated is made to flow inside the tower body 31 from upside to downside.SELECTED DRAWING: Figure 2

Description

The present invention relates to a method for treating water to be treated, a method for producing ultrapure water, a multi-bed resin tower, and an apparatus for producing ultrapure water.

BACKGROUND ART Conventionally, ion exchange resin towers such as those disclosed in Patent Document 1 and Patent Document 2 are known as resin towers installed in a primary pure water production section, a secondary pure water production section, etc. of an ultrapure water production device. Inside the ion exchange resin tower, a packed bed filled with resin particles that adsorbs specific ion components is provided as a bed. Beds arranged inside one resin column include a single-layer bed in which only one packed bed is used, and a multi-layer bed in which two or more packed beds are stacked vertically.

When producing ultrapure water, water to be treated flows through the ion exchange resin column from the top to the bottom. The water to be treated that has passed through the packed bed in the ion exchange resin tower is finally treated to ultrapure water by passing through a predetermined treatment equipment installed at the downstream of the ion exchange resin tower. Note that during the production of ultrapure water, the water to be treated may flow inside the ion exchange resin tower from the bottom to the top, but in that case, special measures are taken to prevent the resin layer from being disturbed.

On the other hand, with treatment such as ion exchange, the adsorption performance of resin particles for ionic components decreases. Further, as the adsorption performance of the resin particles for ionic components decreases, the resin particles contract or expand. As a method for restoring the degraded adsorption performance of ionic components, Patent Documents 1 and 2 disclose that when the water to be treated is passed through, a regeneration liquid containing chemicals such as hydrochloric acid and caustic soda is pumped from the bottom to the top in the tower. A method (hereinafter also simply referred to as a "regeneration method") of backwashing and regenerating the adsorption performance by circulating the adsorbent and bringing the packed bed into contact with a regeneration liquid is disclosed.

Generally, during backwashing or regeneration, the resin is expanded (floated and causes convection) by the upward flow of water. Therefore, it is inevitable that the resin layer will be in a somewhat disordered state after the treatment. Further, disturbance of the resin layer causes deterioration of the quality of treated water. On the other hand, a resin tower that does not undergo such regeneration treatment is called a "non-regeneration type"; in this case, the resin layer is not disturbed by backwashing or regeneration, and water quality does not deteriorate due to this operation.

Examples of multi-layered resin tower systems include Patent Documents 1 to 3. Patent Document 1 directly laminates two beds. Although this method is simple in structure, mixing of the two layers is always a problem. Particularly when backwashing or regeneration is performed, the possibility of mixing increases. Usually, mixing is avoided by using an ion exchange resin with fine particles and/or low specific gravity in the upper layer and a resin with large particles and/or high specific gravity in the lower layer. However, it is difficult to completely separate the two layers. There is also the problem that the height of the tower becomes high.

Further, in Patent Document 2 and Patent Document 3, a fixed perforated plate is installed between two floors. This is essentially the same as a single-bed, two-column system. In this case, there is no risk that the two layers will mix, but there are problems, particularly that the height of the tower becomes high and the structure of the tower becomes complicated.

Furthermore, in a single bed type resin column, although the problem of interlayer mixing does not occur, disturbance of the resin layer during backwashing or regeneration may still be a problem. Therefore, as a countermeasure to this problem, a packed bed method may be adopted. This is a method that minimizes the gaps inside the ion exchange resin tower, which suppresses disturbances in the resin layer during backwashing or regeneration, but it does not allow foreign matter mixed into the resin layer due to backwashing to be discharged. Therefore, there is a concern that regeneration may be insufficient.

Further, in Patent Document 4, a packed bed of ion exchange resin is arranged at the lower side inside the ion exchange resin column, and a packed bed of inert resin particles is arranged on the packed bed of ion exchange resin. . A mesh disk having water permeability is arranged on the packed bed of inert resin particles. A packed layer of glass beads is placed on top of the mesh disk. The packed bed of glass beads acts as a holding layer that presses down the packed bed of inert resin particles when the regenerated liquid rises in the column. According to Patent Document 4, even if a regenerating liquid is passed through a contracted or expanded ion exchange resin during regeneration processing, the disorder of the packed bed caused by the development (fluidization) of the lower part of the packed bed of the ion exchange resin will not occur until the mesh disk is said to be suppressed by

Further, in Patent Document 5, as in Patent Document 4, a packed bed of ion exchange resin is arranged at the lower side inside the ion exchange resin column, and inert resin particles are placed on top of the packed bed of ion exchange resin. A filling layer is placed. A movable plate having water permeability is arranged on the packed layer of inert resin particles. A presser water is placed above the movable plate to press down on the packed bed of inert resin particles when the regenerated liquid rises in the column. According to Patent Document 5, similar to Patent Document 4, even if a regenerating solution is passed through a contracted or expanded ion exchange resin during regeneration treatment, the packed bed due to expansion (fluidization) of the lower part of the packed bed of the ion exchange resin The movable plate is said to suppress this disturbance.

Japanese Patent Application Publication No. 2006-192354 Japanese Unexamined Patent Publication No. 62-210095 Japanese Patent Application Publication No. 2000-202440 Japanese Patent Application Publication No. 2015-080749 Japanese Patent Application Publication No. 2015-080750

When water was actually passed through a non-regenerating multi-bed ion-exchange resin column in an ultrapure water production facility at a certain site, there were cases where the water quality was extremely poor. When the resin tower at this site was checked in detail, the resin layer was found to be disordered as shown in the first packed bed 41 in FIG. 11. Further, when we investigated the cause of this problem, we found that the following phenomenon occurred.

After the first packed bed 41 and the second packed bed 42 containing resin particles that are not in contact with water are arranged inside the resin column, when water is first passed through the arranged packed beds (in this application) (hereinafter referred to as the water filling step), the air existing between the resin particles in the first packed bed 41 on the lower side of the tower combines to generate air bubbles. The generated air bubbles rise in the lower first packed layer 41. When the rising bubbles reach the boundary between the lower first packed bed 41 and the upper second packed bed 42 in the tower and further rise to the upper layer, the first resin in the lower first packed bed 41 Since the bubbles rise together with the particles 41A, the first resin particles 41A in the lower layer and the second resin particles 42A in the second filled layer 42 in the upper layer mix. Alternatively, the resin layer of the upper second filling layer 42 becomes partially thin (state b in FIG. 11). In some cases, the resin layer of the second filling layer 42 disappears (state a in FIG. 11).

This causes a problem in that the uniformity of the treatment capacity for the water flowing through the multi-layered bed decreases, resulting in a decrease in the quality of the water to be treated. That is, if there is a disturbance as in state a in FIG. Contact with exchange resin generates oxygen. Therefore, the oxygen concentration (DO) of the treated water increases. Furthermore, if there is a disturbance as in state b in FIG. 11, the height of the ion exchange resin in the second packed bed 42 directly above state b in FIG. 11 is low, so if water continues to flow, The ion exchange resin in the second packed bed 42 directly above state b in FIG. 11 is deactivated, and the peroxide passes through the second packed bed 42 directly above state b in FIG. contact with ion exchange resin. Therefore, the oxygen concentration (DO) of the treated water increases.

As a means to prevent mixing of packed beds in a single-bed resin tower, a member such as the mesh disk of Patent Document 4 or the movable plate of Patent Document 5 is installed at the boundary between vertically adjacent packed beds as a partition member. One possible method is to arrange it as However, since the mesh disk of Patent Document 4 is a holding member used during regeneration processing, it has not been considered to be placed at the boundary between adjacent packed beds inside a non-regeneration type multi-bed resin tower. Not yet. Furthermore, the effects of ordinary water treatment other than during regeneration treatment, especially when watering after filling with resin, have not been studied. Furthermore, since an inert resin layer and a glass bead layer are required, there is a problem that the tower becomes tall.

Moreover, the movable plate of Patent Document 5 is similar to the above, and requires a height of the plate itself, so there is a problem that the tower becomes tall. In general, resin towers have a weakness in that they require height, which is always a problem when installing water purifiers. In particular, in Patent Document 4 and Patent Document 5, the height is 25% or more of the column diameter, which causes the problem that the installation location of the resin column is limited, which becomes a major problem in the installation of ultrapure water equipment.

In addition, in Patent Document 4, it is necessary to provide a ring on the outer edge of the mesh for fixing a guide plate for moving the mesh disk up and down while maintaining a horizontal state. Therefore, there may arise a problem that the weight of the partition member increases and the manufacturing cost increases. Further, in Patent Document 5, it is necessary to fix a rod-shaped connecting body to the outer edge of the batten so that the movable plate can move up and down while maintaining a horizontal state. Therefore, as in the case of Patent Document 4, there may arise a problem that the weight of the partition member increases and the manufacturing cost increases.

In addition, in a multi-layered resin tower, if a member such as the mesh disk of Patent Document 1 or the movable plate of Patent Document 2 is temporarily arranged as a partition member at the boundary between the packed beds, the partition member and the resin layer There is a concern that a space will be formed in between, which may cause problems. Specifically, in the manufacturing process of ultrapure water, the above-mentioned spaces are created due to the contraction or expansion of resin particles due to the flow of the water to be treated, and this can cause deterioration of water quality as well as disturbance of the resin layer. There is sex.

Here, the ion exchange resin at the top of the lower packed bed is in contact with the lower surface of the partition member. When the ion exchange resin in the lower layer contracts due to water flow, the contraction will not occur completely uniformly, so if there is a part where the contraction is severe, the top of the resin layer and the partition member will A space will be created in between.

As a result, a gap is created between the top surface of the lower filling layer and the lower surface of the partition member. Note that, hereinafter, the gap between the upper surface of the lower filling layer and the lower surface of the partition member is also simply referred to as "the gap on the lower surface side of the partition member." When the volume of the gap increases, the area of the water path (in other words, "channel") of the water to be treated passing through the packed bed expands, which may cause deterioration of water quality.

The present invention has been made focusing on the above problem, and by suppressing the mixing of a plurality of ion exchange resins in a multi-layered resin tower, the present invention allows the distribution of ion exchange resins in a multi-layered resin tower. A method for treating water to be treated that can prevent deterioration in the quality of water to be treated, a method for producing ultrapure water using this method for treating water to be treated, a multilayer bed type resin tower, and this multilayer bed type An object of the present invention is to provide an ultrapure water production device equipped with a resin tower.

The method for treating water to be treated according to the first aspect includes forming a first packed layer containing first resin particles that contacts the water to be treated inside a cylindrical column body, and forming a partition member having water permeability. A partition member made of a material having a degree of flexibility that can be elastically deformed according to the weight of second resin particles different from the first resin particles is placed on the first packed bed in the column. a second packed layer containing the second resin particles is formed on the partition member, and the water to be treated is caused to flow from the upper side to the lower side inside the column body. .

In the first aspect, since the partition member having water permeability is arranged at the boundary between the first packed bed and the second packed bed inside the tower body, the first packed bed and the second packed bed are filled by air bubbles when filling with water. Mixing with other layers can be prevented.

When the ion exchange resin in the first packed bed contracts during water flow, a space is created between the ion exchange resin on the top surface of the first packed bed and the partition member. Then, the second resin particles directly above the space move to fill the space. Since the partition member is elastically deformable, it deforms toward the lower first filling layer accordingly. Therefore, disturbance of the first packed bed due to an increase in the volume of the gap is suppressed, and as a result, a decrease in the uniformity of the processing capacity of the multi-bed resin tower can be suppressed.

Therefore, according to the first aspect, it is possible to prevent the quality of the water to be treated flowing through the multi-bed resin tower from deteriorating.

In a second aspect, the first resin particles or the second resin particles are ion exchange resins and are used in a non-regenerative manner.

In a second embodiment, the ionic component adsorption capacity is used in a non-regenerative manner. Here, the processing capacity recovered by the non-regenerative method is usually higher than the processing capacity recovered by the regenerative method. Therefore, the quality of ultrapure water can be further improved.

In a third aspect, the partition member having a frame member on its outer edge is arranged.

In the third aspect, the frame member makes it difficult for the partition member to turn over, so that mixing of the first filling layer and the second filling layer can be suppressed more effectively.

In a fourth aspect, the partition member is a connected partition member in which a plurality of the partition members are connected to each other so that they can be stacked on top of each other and can be expanded in the same plane, and the partition member is in a state where the plurality of partition members are stacked on top of each other. The connected body is transported inside the tower body, the plurality of transported partition members are expanded inside the tower body, and the expanded partition member connected body is placed on the first packed bed. do.

In the fourth aspect, since the partition member connected body can be folded compactly, for example, even if the working hole provided in the tower body has a relatively small diameter, it can be passed through the working hole. Therefore, installation work can be easily performed.

The method for producing ultrapure water according to the fifth aspect produces ultrapure water using the water to be treated that has been treated by the method for treating water to be treated according to any one of the first to fourth aspects.

In the fifth aspect, ultrapure water can be produced while preventing deterioration in water quality.

The multi-layered resin tower according to the sixth aspect includes a cylindrical tower body, a first packed bed containing first resin particles filled inside the tower body and in contact with the water to be treated, and a first a second packed layer containing second resin particles different from the resin particles and filled above the first packed layer inside the tower body; and a partition member having water permeability, A partition formed of a material having flexibility to the extent that it can be elastically deformed according to the weight of the second resin particles, and is disposed in a non-restricted state with respect to the tower body at the boundary between the layer and the second packed bed. A member.

In the sixth aspect, similar to the first aspect, it is possible to prevent a decrease in the quality of the water to be treated flowing through the multi-bed resin tower.

The ultrapure water production apparatus according to a seventh aspect includes a pretreatment section in which raw water is pretreated, a primary pure water production section in which the raw water treated by the pretreatment section is filtered, and the primary pure water production device a secondary pure water production unit that produces ultrapure water by increasing the purity of the primary pure water treated by the pretreatment unit, the primary pure water production unit, and the secondary pure water production unit; The multi-layered resin tower according to the sixth aspect is provided in at least one of the towers.

In the seventh aspect, similarly to the fifth aspect, ultrapure water can be produced while preventing deterioration in water quality.

According to the present invention, it is possible to prevent a decrease in the quality of water to be treated flowing through a multi-bed resin tower.

FIG. 1 is a block diagram illustrating an ultrapure water production apparatus according to the present embodiment. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway sectional view illustrating a multi-layered resin tower according to the present embodiment. FIG. 2 is a cross-sectional view illustrating the state of a first packed bed and a second packed bed separated by a partition member before resin particles shrink inside the multi-bed type resin column according to the present embodiment. It is a perspective view explaining the partition member concerning this embodiment. FIG. 5(A) is a cross-sectional view schematically illustrating the state of the ion exchange resin in the multi-bed type resin tower according to the present embodiment when water is not flowing, and FIG. FIG. 5(C) is a cross-sectional view schematically illustrating the state of the ion exchange resin in the resin tower during water filling, and FIG. 5(C) shows the resin tower when the water filling process of FIG. 5(B) has further progressed. FIG. 3 is a cross-sectional view schematically illustrating the state of the ion exchange resin inside. FIG. 2 is a cross-sectional view illustrating the state of a first packed bed and a second packed bed separated by a partition member after resin particles have shrunk inside the multi-bed type resin column according to the present embodiment. FIG. 7(A) shows the state of the first packed bed and the second packed bed separated by the partition member before the water to be treated flows inside the multi-bed type resin tower according to the example. FIG. 7(B) is a photograph for explaining the first packed bed and the second packed bed separated by the partition member after the water to be treated has circulated inside the multi-bed type resin tower according to the example. It is a photograph explaining the state with a packed bed. FIG. 8(A) shows the first packed bed and the second packed bed separated by the partition member before the water to be treated flows inside the multi-bed resin tower according to the first comparative example. FIG. 8(B) is a photograph explaining the state, and FIG. 8(B) shows the first filling separated by the partition member after the water to be treated has circulated inside the multi-layered resin tower according to the first comparative example. It is a photograph explaining the state of a layer and a 2nd filling layer. FIG. 7 is a cross-sectional view illustrating the state of a first packed bed and a second packed bed separated by a partition member after resin particles have shrunk inside a multi-bed type resin tower according to a second comparative example. . FIG. 10(A) is a plan view illustrating a state in which a plurality of partition members of a partition member connected body according to a modified example are expanded, and FIG. 10(B) is a plan view 9B-9B in FIG. 10(A). FIG. 10(C) is a cross-sectional view illustrating a state in which a plurality of partition members of a partition member connected body according to a modification are overlapped. FIG. 2 is a cross-sectional view of a resin tower schematically illustrating the state of the ion exchange resin inside the multi-bed type resin tower according to a first comparative example.

Embodiments of the present invention will be described below. In the description of the drawings below, the same or similar parts are denoted by the same or similar symbols. However, the drawings are schematic, and the relationship between thickness and planar dimensions, the ratio of the thickness of each device and each member, etc. are different from the reality. Therefore, specific thickness and dimensions should be determined with reference to the following explanation. Furthermore, the drawings include portions that differ in dimensional relationships and ratios.

<Ultrapure water production equipment>
As shown in FIG. 1, the ultrapure water production apparatus 10 according to the present embodiment includes a pretreatment section 12, a primary pure water production section 14, a tank 16, and a secondary pure water production section 18.

(Pre-processing section)
City water, well water, industrial water, etc. are introduced into the pretreatment unit 12 as raw water. In this embodiment, the pretreatment unit 12 generates pretreated water by removing suspended matter from the introduced raw water. The pre-treatment section can be constructed as appropriate depending on the quality of the raw water, as long as it is a facility that pre-treats the raw water.

In the present invention, the pre-treatment section can be configured as appropriate depending on the quality of the raw water, etc., as long as it is equipment that pre-treats the raw water. For example, the pretreatment unit 12 may include a sand filter device, a microfiltration device, etc., and may further include a heat exchanger or the like for adjusting the temperature of the water to be treated, if necessary.

(Primary pure water production department)
In the primary pure water production section 14, the raw water treated by the pretreatment section 12, that is, the pretreated water, is filtered. The primary pure water production unit 14 produces primary pure water by removing organic components, ionic components, dissolved gases, etc. from the pretreated water, and supplies the produced primary pure water to the tank 16 .

Although not shown, the primary pure water production unit 14 includes, for example, an activated carbon device (AC), a two-bed three-tower device (2 beds, three towers, 2B3T), a reverse osmosis membrane device (RO), and an ultraviolet oxidation device (TOC). -UV), a mixed bed ion exchanger (MB), and a deaerator (DG).

The activated carbon device is an activated carbon tower that includes activated carbon such as coconut shell activated carbon. Activated carbon devices remove organic substances contained in water to be treated by adsorbing them onto activated carbon. The two-bed three-tower type device is an integrated device in which a first ion exchange device, a decarboxylation device, and a second ion exchange device are arranged in series.

The first ion exchange device is, for example, a regenerative single-layer bed type or regenerative multi-layer bed type cation exchange resin tower in which a cation exchange resin is housed in the resin tower. The decarboxylation device removes carbonic acid components from the water treated by the first ion exchange device. The second ion exchange device is, for example, a regenerative single-layer bed type or regenerative multi-layer bed type anion exchange resin tower in which an anion exchange resin is housed in the resin tower.

The reverse osmosis membrane device uses a reverse osmosis membrane (RO membrane) to remove impurities and salts from the water to be treated that has been treated in a two-bed, three-tower type device. The ultraviolet oxidation device decomposes and removes trace amounts of organic matter in the water by irradiating the water to be treated that has passed through the reverse osmosis membrane device with ultraviolet rays. The ion exchange device is, for example, a mixed bed type ion exchange resin column in which a cation exchange resin and an anion exchange resin are housed in the resin column.

The deaerator is, for example, a membrane deaerator or a vacuum deaerator for removing gaseous components such as oxygen contained in the water to be treated that has passed through the ion exchange device. The primary pure water manufactured by the primary pure water manufacturing unit 14 has, for example, a total organic carbon (TOC) concentration of 5 μgC/L or less and a resistivity of 17 MΩ·cm or more.

(tank)
Tank 16 stores primary pure water. Although not shown, each of the equipment constituting the ultrapure water production apparatus 10 is connected to a control device that controls the operation of each equipment. A necessary amount of primary pure water can be supplied from the tank 16 to the secondary pure water production section 18 by the control device.

(Secondary pure water production department)
The secondary pure water production unit 18 produces ultrapure water by increasing the purity of the primary pure water processed by the primary pure water production unit 14. Specifically, the secondary pure water production section 18 produces secondary pure water by removing impurities in the primary pure water produced by the primary pure water production section 14. The produced secondary pure water is supplied as ultrapure water to a point of use (POU) where the ultrapure water is used. The surplus ultrapure water that has passed through the use point POU is collected by the tank 16.

Although not shown, the secondary pure water production unit 18 includes, for example, a heat exchanger, an ultraviolet oxidation device (TOC-UV), a hydrogen peroxide removal device, a degassing membrane device, and a resin column on the downstream side of the tank 16. Equipped with the following equipment. The heat exchanger adjusts the temperature of the primary pure water supplied from the tank 16. The ultraviolet oxidation device decomposes and removes trace amounts of organic matter in the water by irradiating primary pure water whose temperature is controlled with a heat exchanger with ultraviolet light.

A hydrogen peroxide removal device is a device for decomposing and removing hydrogen peroxide in water. Hydrogen peroxide removal devices include, for example, palladium-supported resin devices that decompose and remove hydrogen peroxide using palladium (Pd)-supported resins, and basic anion exchange resins filled with reducing resins having sulfite groups and/or hydrogen sulfite groups. This includes reducing resin equipment.

A degassing membrane device depressurizes the secondary side (i.e., downstream measurement in the ultrapure water production process) of a membrane that has gas permeability, and depressurizes the primary side (i.e., the upstream measurement in the ultrapure water production process). Only the dissolved gas in the flowing water is removed by permeating it to the secondary side.

The resin tower according to this embodiment is a multi-bed type ion exchange resin tower having a first packed bed and a second packed bed. Each bed arranged inside the resin tower acts as a polisher and adsorbs and removes trace amounts of cationic or anionic components in the water to be treated. The partition member according to this embodiment is arranged inside the resin tower.

In this embodiment, a multi-layered resin tower is installed at the final stage in the secondary pure water production section 18, that is, immediately before the ultrafiltration membrane device (UF) provided at the position immediately before the use point POU. An example is given below. The resin column according to the present invention can be placed at any position in the equipment other than the secondary pure water producing section 18, such as the final stage of the primary pure water producing section 14, for example. In the present invention, the multi-layered resin tower may be provided in at least one of the pretreatment section 12, the primary pure water production section 14, and the secondary pure water production section 18.

In the secondary pure water production department, for example, the ion exchange resin tower according to the present invention is arranged after the degassing membrane device, and the ultrafiltration membrane device (UF) is arranged after the ion exchange resin tower. Good too. The ultrafiltration membrane device processes the water to be treated by the resin tower, removes fine particles with a particle size of 50 nm or more (more preferably 10 nm or more), and produces ultrapure water (i.e., secondary pure water). ) is manufactured.

The quality of the ultrapure water produced by the ultrapure water production apparatus 10 according to the present embodiment is such that, for example, the number of fine particles with a particle diameter of 50 nm or more is 50 pcs. /L or less, the total organic carbon (TOC) concentration is 1 μgC/L or less, and the resistivity is 18 MΩ·cm or more. The iron (Fe) concentration is 0.05 μg/L or less, and the dissolved oxygen (DO) concentration is 2 μg/L or less.

In addition, in this invention, the equipment or apparatus which comprises an ultrapure water production apparatus can be set suitably. For example, a tank for storing ultrapure water used at the point-of-use POU and a wastewater recovery device connected to the tank may be provided. The ultrapure water as wastewater recovered by the wastewater recovery device may be sent to a predetermined device in the line of the pretreatment unit 12 as water to be treated, so that it can be circulated through the line of the ultrapure water production device again. .

<Multi-layered resin tower>
Next, the multi-layered resin tower according to this embodiment will be specifically explained with reference to FIGS. 2 to 6. As shown in FIG. 2, the multi-bed resin tower 25 according to the present embodiment includes a tower body 31, a first packed bed 41, a second packed bed 42, and a partition member 50.

(Tower body)
The tower body 31 is a cylindrical container and is the main body of the resin tower 25. In addition, in the present invention, the shape of the tower body is not limited to a cylindrical shape, but may be other cylindrical shapes such as a rectangular tube shape. The diameter of the cylinder of the tower body 31 is, for example, about 300 mm to 2000 mm. An inlet pipe 32 is provided at the upper part of the tower body 31 of the resin tower 25 . The inlet pipe 32 introduces water to be treated as inlet water into the inside of the column body 31 . Further, an outlet pipe 34 is provided at the lower part of the column body 31 of the resin column 25. The outlet pipe 34 guides the water to be treated as outlet water to the outside of the column body 31 .

(First packed bed and second packed bed)
As shown in FIG. 3, the first filled layer 41 includes a plurality of first resin particles 41A. The second filling layer 42 includes a plurality of second resin particles 42A. The first packed bed 41 is filled in the lower side of the internal space inside the column body 31, and the second packed bed 42 is filled in the upper side of the first packed bed 41 inside the column body 31.

(First resin particles)
In this embodiment, the first resin particles 41A forming the first packed bed 41 are ion exchange resin particles whose volume changes by shrinking upon contact with the water to be treated. Note that in the present invention, the resin particles may be expanded. Further, in the present invention, as the first resin particles 41A, strong acid ion exchange resin (SC), strong basic ion exchange resin (SA), strong acid ion exchange resin (SC), and strong basic ion exchange resin ( Mixing with SA) can be adopted as appropriate.

The particle size R1 of the first resin particles 41A according to the present embodiment is, for example, about 0.4 mm to about 0.5 mm. The particle size R1 illustrated in FIG. 3 is the size before the water to be treated flows through the first packed bed 41, that is, before the first resin particles 41A shrink. Note that in the present invention, the diameter of the first resin particles 41A is not limited to this and can be changed as appropriate. Further, in this embodiment, for convenience of explanation, all the first resin particles 41A are illustrated as having the same particle size R1, but in reality, the particle size of the first resin particles 41A is Each may be different.

(Second resin particles)
In the present embodiment, the second resin particles 42A forming the second packed bed 42 are particles of ion exchange resin that contract upon contact with the water to be treated, like the first resin particles 41A. The type of the second resin particles 42A is different from the type of the first resin particles 41A.

The second resin particles 42A include various strong acidic ion exchange resins (SC), strong basic ion exchange resins (SA) for removing silica, and strong basic ion exchange resins carrying sulfite groups and/or hydrogen sulfite groups. A resin resin (reducing resin), a boron-selective resin (B) that also has a boron-selective exchange group such as an N-glucamine group, a resin supporting a noble metal catalyst, etc. can be appropriately employed. The noble metal of the noble metal catalyst supporting resin may be, for example, palladium (Pd) or platinum (Pt).

The particle size R1 of the second resin particles 42A according to this embodiment is about 0.4 mm to about 0.5 mm, similar to the first resin particles 41A. The particle size R1 illustrated in FIG. 3 is the size before the second resin particles 42A shrink, similar to the first resin particles 41A. Note that in the present invention, the diameter of the second resin particles 42A is not limited to this, and can be changed as appropriate. Further, as in the case of the first resin particles 41A, all the second resin particles 42A are illustrated as having the same particle size R2, but in reality, the particle size of the second resin particles 42A is , each may be different.

The resin tower 25 according to the present embodiment is usually composed of a plurality of parallel resin towers of the same scale. Additionally, in order to avoid shutting down the ultrapure water production equipment during regeneration, a spare resin tower may be provided.

The resin tower 25 according to this embodiment is a non-regenerating resin tower. Therefore, when the ion exchange capacity of the first packed bed 41 or the second packed bed 42 decreases, the apparatus is stopped and the first packed bed 41 or the second packed bed 42 is removed from the inside of the column body 31. The removed packed bed can be reused by being recycled at a location other than the ultrapure water production device, such as a factory. Alternatively, a new packed bed may be placed inside the resin column 25 as the first packed bed 41 or the second packed bed 42 without reusing the removed packed bed.

Since the resin column 25 of the present invention is of a non-regenerative type, a deionization device such as a regenerative type ion exchange device is provided at the front stage in order to reduce the frequency of resin exchange. For example, when the resin column 25 of the present invention is installed in the primary system, a deionization device such as a reverse osmosis device, a regenerative ion exchange device, a 2B3T device, an electric regenerative ion exchange device (EDI), etc. is installed in the previous stage. be done. When the resin column 25 of the present invention is installed in the secondary system, the reverse osmosis device, regenerative ion exchange device, 2B3T device, electric regenerative ion exchange device (EDI), etc. provided in the primary system are installed in this system. play a role.

In the present invention, it is only necessary to install a partition member when filling the ion exchange resin, and the height of the resin layer does not change. Furthermore, since the partition member can be taken in and out of the manhole tower of an existing device, it can be applied to an existing single-layer floor or multi-layer resin tower without any modification. In addition, in the case of a single-layer floor, it can be adopted when changing to a multi-layer floor. Further, when the present invention is used, there are no restrictions on the particle size or specific gravity of the ion exchange resin, so the selection of the ion exchange resin becomes free. Therefore, for example, it becomes possible to select resins suitable for obtaining the optimum water quality or resins at low cost without any restrictions.

In addition, in the case of a multilayer bed, the lower layer is filled with a general resin, that is, a resin that generally removes cations and/or anions, and the upper layer is filled with a resin that supplements the functions of the lower resin layer. It is often filled with resin to add some special function. Therefore, the lower resin layer tends to be thicker and the upper resin layer tends to be thinner. Therefore, when disturbance of the resin layer occurs as in the problem of the present application, the thin upper layer is particularly susceptible to the disturbance of the resin layer, and the function performed by the upper layer is often significantly degraded. By using the present invention, this problem can be solved.

(Partition member)
As shown in FIG. 3, the partition member 50 is arranged at the boundary between the first filling layer 41 and the second filling layer 42. As shown in FIG. 4, the partition member 50 has a circular shape in plan view. The partition member 50 has a mesh portion 52 and a frame member 54.

(mesh part)
The mesh portion 52 has a planar shape and is located at the center of the circular partition member 50. The load of the second filling layer 42 is applied to the mesh portion 52 from above. As shown in FIG. 6, the mesh portion 52 is formed of a material that is flexible enough to be elastically deformable according to the weight of the plurality of second resin particles 42A included in the second filling layer 42.

In other words, the partition member 50 is configured to have the flexibility to be elastically deformable when the second filling layer 42 is disposed on the mesh portion 52 and the water to be treated is distributed. Ru. The mesh portion 52 of this embodiment is made of an organic material such as polyvinylidene chloride, so that it can be deformed more flexibly in the vertical direction than when the mesh portion 52 is made of metal. As the partition member, Saran Net (trade name) is preferable.

Note that the particle size R2 of the first resin particles 41A illustrated in FIG. 6 is the particle size after the water to be treated flows through the first packed bed 41, that is, after the first resin particles 41A have shrunk. It is. Similarly, the particle size R2 of the second resin particles 42A is the particle size after the water to be treated flows through the first packed bed 41, that is, after the second resin particles 42A have shrunk. For example, in the present invention, the flexibility of the mesh portion is such that it can be elastically deformed to protrude downward by a height corresponding to a certain percentage of the thickness of the second filling layer. Can be set.

The mesh portion 52 has a mesh shape such that the second resin particles 42A having the smallest particle size among the second resin particles 42A having the particle size R2 after shrinkage are prevented from passing through the mesh. is set. Specifically, in this embodiment, for example, the mesh of the mesh portion 52 is about 60, and the opening of the mesh portion 52 is about 0.3 mm or less. Further, the weave of the mesh portion 52 is preferably plain weave from the viewpoint of lowering water passage resistance, but tatami-folding may also be used. In the present invention, the specifications of the mesh portion, including dimensions such as the mesh, wire diameter and opening, and weaving method, can be changed as appropriate.

(Frame member)
The frame member 54 is ring-shaped, as shown in FIG. The frame member 54 is provided at the outer edge of the partition member 50. The frame member 54 can be made of a metal material with relatively high corrosion resistance, such as titanium or stainless steel. Note that it may be made of materials other than metal materials, such as resin or animal hair. Note that the frame member 54 may be omitted.

In this embodiment, the frame member 54 is arranged with a small gap between it and the inner wall surface of the tower body 31 to the extent that it can move up and down inside the tower body 31. Therefore, the partition member 50 is arranged in an unrestricted state with respect to the tower body 31. Note that the unrestricted state means that it is not fixed to the wall of the tower, etc. In this embodiment, the frame member 54 makes it difficult for the partition member 50 to turn over.

In FIG. 4, for ease of viewing, a frame member 54 is illustrated that has a constant thickness in the vertical direction and is belt-shaped in a plan view, but in this embodiment, the frame member 54 is The thickness is so thin that it can be practically ignored. Specifically, the frame member 54 can be made of, for example, a wire-like metal material having a thickness comparable to that of the wire members forming the mesh of the mesh portion 52. By setting the thickness of the frame member 54 thin, it is possible to reduce the weight and cost of the partition member 50. Note that in the present invention, the thickness of the frame member 54 is not limited to this, and can be changed as appropriate.

In this embodiment, the partition member 50 is arranged so that the mesh portion 52 has openings and there is a slight gap between the frame member 54 and the inner wall surface of the tower body 31 to the extent that the frame member 54 can move up and down. It has water permeability. In the present invention, the water permeability of the partition member 50 is determined by the fact that the mesh portion 52 has openings and that there is a slight gap between the frame member 54 and the inner wall surface of the tower body 31 to the extent that the frame member 54 can move up and down. This may be achieved by only one of the following arrangements. Further, the water permeability of the partition member 50 may be realized by forming a water passage other than openings, such as a through hole, for example.

<Method for treating water to be treated and method for producing ultrapure water>
Next, a method for treating water to be treated according to this embodiment will be explained. First, the resin tower 25 according to this embodiment is prepared. Next, a first packed bed 41 is formed inside the tower body 31 of the resin tower 25. Next, the partition member 50 is placed on the first packed bed 41 in an unrestricted state relative to the tower body 31. Next, as shown in FIG. 5(A), a second filling layer 42 is formed on the partition member 50. Then, after passing through the water filling process as shown in FIGS. 5(B) and 5(C), the water to be treated may be passed from the upper side to the lower side.

In FIG. 5(B), a state in which bubbles B are generated inside the water to be treated W accumulated inside the first packed bed 41 is illustrated. Moreover, in FIG. 5(C), inside the water W to be treated accumulated inside the first packed bed 41, a state in which the bubbles B rise, a state in which the bubbles B pass through the partition member 50, and a state in which the bubbles B pass through the partition member 50 are shown. A state in which bubbles B rise inside the second filling layer 42 is illustrated.

Furthermore, the resin tower 25 according to this embodiment is of a non-regenerative type. Therefore, in the method for treating water to be treated according to the present embodiment, when the adsorption performance of the ion exchange resin decreases, the first resin particles 41A or the second resin particles 42A are taken out from the inside of the column body 31. Then, fill it with new resin.

The above-described series of processes can configure the method for treating water to be treated according to the present embodiment. Further, by using the water to be treated by the method for treating water to be treated according to the present embodiment in the production line of the ultrapure water production apparatus 10, it becomes possible to produce highly pure ultrapure water. .

In the present invention, the method for treating the water to be treated is not limited to the method for producing ultrapure water, and any method may be used as long as the treatment is performed inside the resin tower 25 using resin particles. Further, as long as the treatment is performed using resin particles inside the resin tower 25, the object to be treated is not limited to water, and any fluid such as liquid or gas may be used.

Next, a test example of the resin tower 25 according to the present embodiment will be described as an example. A transparent acrylic tower body 31 was prepared. The inner diameter of the cylinder of the tower body 31 was about 50 mm.

Next, about 200 ml of a strong basic anion exchange resin (trade name: Duolite AGP, manufactured by Rohm and Haas) is filled as the first resin particles 41A into the inside of the column body 31. was formed. Next, on the first packed bed 41 inside the tower body 31, a partition member 50 made of Saran net and having a mesh portion 52 of the mesh 50 was loaded.

Next, by filling about 200 ml of a strong acidic cation exchange resin (trade name: Diaion SKT10L, manufactured by Mitsubishi Chemical Corporation) as the second resin particles 42A on the partition member 50 inside the column body 31, A second filling layer 42 was formed. Then, as shown in FIG. 7(A), a multi-layer bed type resin tower 25 according to the embodiment is formed, in which the second packed bed 42 is arranged above the first packed bed 41 via the partition member 50. did.

Here, in the ultrapure water production apparatus, when water is first passed into the resin column 25, the air attached to the surface of the first resin particles 41A is usually formed as bubbles in the first packed bed 41. Occur. The bubbles generated in the first packed bed 41 rise in the water. When the rising bubbles reach the second filled layer 42, the first filled layer 41 and the second filled layer 42 are mixed. Further, the arrangement of the plurality of second resin particles 42A of the second filling layer 42 is disturbed. As a result, the quality of the water flowing through the first packed bed 41 and the second packed bed 42 is reduced.

Therefore, in the example, in order to make it easier to observe the movement of bubbles formed by the air adhering to the surface of the first resin particles 41A, a certain amount of air was pumped into the multi-layered resin tower according to the example. It was introduced from the bottom of 25. Then, the test water was caused to flow from the bottom to the top at a flow rate of 3 [m/hour] to allow air bubbles to pass inside the first packed bed 41 . The water temperature of the test water was 16°C. In addition, at this time, the ion exchange resin layer did not develop, that is, the resin did not undergo convection due to the water flow.

In the example, most of the air bubbles that passed inside the first filled layer 41 were held by the mesh portion 52 of the partition member 50, thereby suppressing their movement to the upper second filled layer 42. Therefore, as shown in FIG. 7(B), in the example, after the bubbles are passed inside the first filled layer 41, the boundary between the first filled layer 41 and the second filled layer 42 is clearly observed. did it. In FIG. 7A, the position of the black horizontal line drawn on the adhesive member attached to the outer wall surface of the tower body 31 indicates the boundary between the first packed bed 41 and the second packed bed 42. That is, the first filling layer 41 and the second filling layer 42 did not mix. Moreover, no disturbance occurred in the arrangement of the plurality of second resin particles 42A of the second filled layer 42.

In addition, in FIG. 7(B), the height of the boundary between the first packed bed 41 and the second packed bed 42 inside the tower body 31 is lower than the position of the black horizontal line drawn on the adhesive member. This is because the air between the first resin particles 41A escapes out of the resin layer in the form of bubbles due to the water flow, so the resin particles adjoin each other more closely than before the water flow, resulting in a decrease in the thickness of the first filled layer 41 as a whole. This is because.

<First comparative example>
On the other hand, as shown in FIG. 8(A), a resin tower having the same specifications as the resin tower 25 according to the example except for the partition member was prepared as a first comparative example, and the resin tower according to the first comparative example was A test example according to the first comparative example was conducted under the same test conditions as those of the example.

In the case of the first comparative example, as shown in FIG. The boundary with the second filling layer 42 could no longer be observed. That is, the first filled layer 41 and the second filled layer 42 were mixed, and the arrangement of the plurality of second resin particles 42A of the second filled layer 42 was disturbed. Note that in this example, the entire boundary surface of the resin layer was disturbed and the state shown in FIG. 11 could not be observed, but this is thought to be because the test column used had a small diameter.

<Second comparative example>
In addition, a resin tower was prepared as a second comparative example in which a partition member 50Z having a mesh portion without flexibility, unlike the partition member 50 according to the present embodiment, was provided. As shown in FIG. 9, in the second comparative example, the mesh portion does not have flexibility, so even if the first resin particles 41A shrink on the lower surface side of the partition member 50Z, the mesh portion fills the gap. It does not deform like this. Therefore, in the second comparative example, when water continues to flow and the volume of the ion exchange resin changes, the volume of the gap G on the lower surface side of the partition member 50Z expands as the water to be treated flows. will continue to do so. Not only does this gap cause deterioration of water quality, but if water continues to flow through the partition member 50, it becomes increasingly difficult to keep it level, and there is a risk that the partition member 50 may tilt or overturn.

When the method of the present invention is used, when the ion exchange resin column is filled with water after being filled with new ion exchange resin, air bubbles generated in the lower first packed bed 41 rise and the first packed bed 41 When crossing the second filled layer 42, the partition member 50 prevents the lower first resin particles 41A from moving to the upper second filled layer 42 as the bubbles rise. Therefore, mixing of the lower first resin particles 41A and the upper resin particles due to the rise of air bubbles is suppressed.

Furthermore, as shown in FIG. 5(A), when water is passed for the first time, the spaces between each of the first resin particles 41A and the second resin particles 42A are not filled with water. There is no buoyancy. Furthermore, as shown in FIGS. 5(B) and 5(C), even when the bubbles B rise in the water to be treated W, the upper part of the resin layer (first packed layer 41) is filled with water. Since there is no cover, the partition member 50 becomes a weight, so the partition member 50 does not overturn.

Further, following FIG. 5(C), when water flow is started and the water to be treated W accumulates above the partition member 50, the second resin particles 42A are always pressed against the partition member 50 by the water flow from above. , will remain as it is. Even if water flow is stopped, the current state can be maintained as long as backwashing from the bottom to the top in FIG. 5 is not performed.

<Other embodiments>
Although the present invention has been described with reference to the embodiments disclosed below, the statements and drawings that form part of this disclosure are not intended to limit the present invention.

<Modification: Partition member connection body>
In this embodiment, as shown in FIG. 1, the case where one partition member 50 having a circular shape in plan view is arranged inside the tower body 31 was exemplified, but the present invention is limited to this. Not done. For example, like a partition member connection body 60 according to a modified example shown in FIG. 10(A), three partition members are connected to form one partition member connection body 60 having a circular shape in plan view. It's okay.

The partition member connected body 60 according to the modification includes a first partition member 60A, a second partition member 60B, a third partition member 60C, a first connector 70, and a second connector 72. The diameter d of the partition member connected body 60 is approximately equal to the inner diameter of the tower body 31. Further, the first partition member 60A, the second partition member 60B, and the third partition member 60C each extend in the vertical direction in FIG. 10(A).

The first partition member 60A includes a mesh portion 62A and a frame member 64A provided at the outer edge of the mesh portion. The second partition member 60B includes a mesh portion 62B and a frame member 64B provided at the outer edge of the mesh portion. The third partition member 60C has a mesh portion 62C and a frame member 64C provided at the outer edge of the mesh portion. Note that the structure of the mesh portion of each partition member and the structure of the frame member of the partition member connected body 60 according to the modified example are the same as those of the partition member 50 illustrated in FIG. omitted.

The first partition member 60A is located at the center in the left-right direction of the partition member connected body 60 in FIG. 10(A). The first partition member 60A is a member that includes the center of the circle of the partition member connection body 60. The outer edge of the first partition member 60A includes a pair of straight line parts that extend along the vertical direction in FIG. , and a lower circular arc portion connecting the lower ends of the pair of straight portions. The first partition member 60A is vertically symmetrical and horizontally symmetrical with respect to the center of the circle of the partition member coupling body 60 in FIG. 10(A).

The second partition member 60B is located on the left side of the first partition member 60A in FIG. 10(A). The outer edge of the second partition member 60B has a straight part extending vertically in parallel with the left straight part of the first partition member 60A in FIG. 10(A) and a straight part on the left side of the straight part. It has an arcuate part connecting the upper end and the lower end of. That is, the second partition member 60B is fan-shaped in plan view and vertically symmetrical in FIG. 10(A).

The third partition member 60C is located on the right side of the first partition member 60A in FIG. 10(A). The outer edge of the third partition member 60C has a straight part extending vertically in parallel with the straight part on the right side of the first partition member 60A in FIG. 10(A) and a straight part on the right side of the straight part. It has an arcuate part connecting the upper end and the lower end of. That is, the third partition member 60C is fan-shaped in plan view and vertically symmetrical in FIG. 10(A).

In FIG. 10(A), the second partition member 60B and the third partition member 60C are arranged symmetrically. That is, the second partition member 60B and the third partition member 60C can be used as common parts, which is advantageous from the viewpoint of reducing manufacturing costs and storage space.

In the modified example, three partition members 50 are arranged so that the partition member connected body 60 is vertically symmetrical and horizontally symmetrical. Note that, in the present invention, the number of "partition members" is not limited to three, and may be composed of two or more members.

As shown in FIGS. 10(B) and 10(C), the first connector 70 is made of a flexible member and is therefore expandable and contractible. In the modified example, six first connectors 70 are provided between the first partition member 60A and the second partition member 60B, and between the first partition member 60A and the third partition member 60C, six each in the vertical direction. placed with a gap between them. Note that in the present invention, the material, shape, number, etc. of the first connector are not limited to these, and can be changed as appropriate.

The second connector 72 is strip-shaped in plan view, as shown in FIG. 10(A). The second connector 72 is a mesh member made of a material having water permeability and flexibility similar to the mesh portion of the partition member 50 illustrated in FIG. 3 . Further, the mesh of the second connector 72 is smaller than the diameter of the second resin particles 42A located above the second connector 72 inside the tower body 31.

One second connector 72 is arranged between the first partition member 60A and the second partition member 60B and between the first partition member 60A and the third partition member 60C. Specifically, as shown in FIGS. 10(A) and 10(B), the second connector 72 on the left side connects to the outer edge of the first partition member 60A and the second partition, which are spaced apart from each other. It has a width in the left and right direction that spans both the outer edge of the member 60B.

Further, the second connector 72 on the left side in FIG. 10(B) is joined to the upper surface of the first partition member 60A and the upper surface of the second partition member 60B. In the modified example, the first partition member 60A and the second partition member 60B and the second connector 72 are joined by sewing. Note that in the present invention, the joining method is not limited to this, and any method such as heat welding or joining using an adhesive may be used.

The second connector 72 having water permeability and flexibility prevents the first filling layer 41 and the second filling layer 42 from mixing at a position between the first partition member 60A and the second partition member 60B. , the gap formed between the lower surface side of the second connector 72 and the first filling layer 41 can be reduced. Note that the second connector 72 on the right side in FIGS. 10(A) and 10(B) is arranged symmetrically with the second connector 72 on the left side, and is similar to the second connector 72 on the left side. It has a configuration.

As shown in FIGS. 10(A) and 10(B), in the partition member connected body 60, the first connecting tool 70 and the second connecting tool 72 connect the first partition member 60A and the second partition member 60B. The third partition member 60C is connected so as to be expandable within the same plane. Note that, in the present invention, when connecting a plurality of partition members, both the first connector 70 and the second connector 72 are not essential, and the plurality of partition members may be connected by only one of them.

Moreover, as shown in FIG. 10(C), in the partition member connected body 60 according to the modification, the first connecting tool 70 and the second connecting tool 72 connect the first partition member 60A, the second partition member 60B, and the The three partition members 60C can be stacked on top of each other. In addition, in FIG. 10(C), the second partition member 60B and the third partition member 60C are both overlapped on the upper side of the first partition member 60A, but in the present invention, the overlapping The alignment state is not limited to this. In the present invention, the second partition member 60B and the third partition member 60C may both be stacked on the lower side of the first partition member 60A, or may be placed on opposite sides of the first partition member 60A. It may be superimposed on the surface.

Further, in the modified example, a case was illustrated in which a frame member was provided for each of the three partition members, but in the present invention, the frame member is provided in the portion of the plurality of partition members that faces the inner wall surface of the tower body 31. It may be provided only on the outer edge. That is, the frame member may not be provided on the linear portion of the outer edge of the partition members that are adjacent to each other, but may be provided only on the portion that constitutes the circular outer edge of the partition member connected body 60 in the expanded state. Since the frame member is not provided on the linear portion of the outer edge of the adjacent partition members, the flexibility of the mesh portion can be ensured even in the portion where the frame member is not provided.

As a method of using the partition member connected body 60 according to the modified example, first, as shown in FIG. Transport to. Then, the plurality of transported partition members may be unfolded inside the tower body 31, and the partition member connected body 60 in the unfolded state may be placed on the first packed bed 41.

Alternatively, the partition member may be made into a plurality of parts, brought into the tower as parts, and combined within the tower.

In the modified example, since the partition member connected body 60 can be folded compactly, even if the working hole provided in the tower body 31 has a relatively small diameter, it can be passed through the working hole, for example.

Furthermore, the present invention can be configured by partially combining the configurations illustrated in FIGS. 1 to 11. As described above, the present invention includes various embodiments not described above, and the technical scope of the present invention is determined only by the matters specifying the invention in the claims that are reasonable from the above explanation. be.

10 Ultrapure water production device 12 Pretreatment section 14 Primary pure water production section 16 Tank 18 Secondary pure water production section 25 Resin tower 31 Tower body 32 Inlet pipe 34 Outlet pipe 41 First packed bed 41A First resin particles 42 2 Filling layer 42A Second resin particles 50 Partition member 50Z Partition member 52 Mesh part 54 Frame member 60 Partition member connections 60A, 60B, 60C Partition members 62A, 62B, 62C Mesh part 64A, 64B, 64C Frame member 70 1st Connector 72 Second connector B Air bubble G Gap H Water level POU Use point R1 Particle size R2 Particle size W Treated water d Diameter

Claims (7)

forming a first packed bed containing first resin particles in contact with the water to be treated inside the cylindrical column;
The partition member has water permeability and is made of a material that is flexible enough to be elastically deformed according to the weight of second resin particles different from the first resin particles. 1 disposed on a packed bed in an unrestrained state with respect to the column body,
forming a second filling layer containing second resin particles on the partition member;
The water to be treated is caused to flow from the upper side to the lower side inside the column body,
How to treat treated water. The first resin particles or the second resin particles are ion exchange resins and are used in a non-regenerative manner,
The method for treating water to be treated according to claim 1. characterized in that the partition member having a frame member on the outer edge is arranged,
The method for treating water to be treated according to claim 1 or 2. A plurality of partition members are connected to each other so that they can be overlapped with each other and can be expanded in the same plane, and the partition member connection body in which the plurality of partition members are overlapped is connected to the tower. transported inside the body,
Expanding the plurality of transported partition members inside the tower body,
The partition member connected body in an expanded state is arranged on the first filling layer,
The method for treating water to be treated according to claim 3. Ultrapure water is produced using the water to be treated by the method for treating water to be treated according to claim 1 or 2,
A method for producing ultrapure water. A cylindrical tower body,
a first packed bed containing first resin particles filled inside the column body and in contact with the water to be treated;
a second packed bed containing second resin particles different from the first resin particles and filled above the first packed bed inside the tower;
A partition member having water permeability, which is disposed at the boundary between the first packed bed and the second packed bed in a non-restricted state with respect to the tower body, and is elastically deformed according to the weight of the second resin particles. A partition member formed of a material having a possible degree of flexibility;
A multi-layered resin tower characterized by being equipped with. a pretreatment section where raw water is pretreated;
a primary pure water production unit in which the raw water treated by the pretreatment unit is filtered;
a secondary pure water production unit that produces ultrapure water by increasing the purity of the primary pure water processed by the primary pure water production unit;
The multi-layered resin tower according to claim 6, which is provided in at least one of the pretreatment section, the primary pure water production section, and the secondary pure water production section;
An ultrapure water production device characterized by comprising: