WO2012056668A1

WO2012056668A1 - Reverse osmosis membrane structure for water treatment and reverse osmosis membrane module

Info

Publication number: WO2012056668A1
Application number: PCT/JP2011/005919
Authority: WO
Inventors: 泰子山田; 牛房　信之; 敬子中野
Original assignee: 株式会社日立製作所
Priority date: 2010-10-29
Filing date: 2011-10-24
Publication date: 2012-05-03
Also published as: JP2012091150A

Abstract

In reverse osmosis membranes used for advanced treatment in waste water recycling, seawater desalination, etc., the adsorption of organic substances dissolved in the water to the surface of the reverse osmosis membrane and causing clogging, reducing the volume of permeating water, and increasing the frequency of reverse osmosis membrane module exchange, is a problem. To remove dissolved organic substances efficiently and solve said problem: a ceramic filter with a honeycomb structure having a large adsorption surface area is used; the communicating pores of the ceramic filter are used as flow channels; and some of the flow channels are plugged, and the water to be treated is made to pass through partition walls and is treated by the partition wall with a reverse osmosis membrane, which has an amide group-containing high molecular weight polymer. Because the water to be treated is filtered when it passes through the partition walls of the flow channels, it becomes cleaner and adhesion of organic substances to the reverse osmosis membranes can be reduced. Moreover, since the flow channels are wide, on the order of micrometers, clogging does not occur easily.

Description

Reverse osmosis membrane structure for water treatment and reverse osmosis membrane module

The present invention relates to a reverse osmosis membrane technology used for wastewater regeneration treatment and seawater desalination treatment.

In recent years, there have been active investments in water businesses, particularly in China and India, where economic growth continues, and in the Middle East where water resources are scarce. In these areas, water supply capacity is insufficient, and water regeneration treatment technology is required.

Water recycling refers to removing unnecessary materials from domestic wastewater (sewage) and industrial wastewater, and purifying water according to the intended use, such as domestic water, industrial water, and agricultural water.

As a water recycling facility, there is a method combining a membrane separation activated sludge facility (MBR, Membrane Bio-Reactor) and a reverse osmosis membrane. Since organic substances and salts that cannot be decomposed by organisms are dissolved in water treated with MBR, a reverse osmosis membrane is used for the purpose of removing them. Reverse osmosis membranes are also used for desalination of seawater, production of pure water for the production of precision electronic equipment such as semiconductors, and advanced treatment of clean water. The general structure of a reverse osmosis membrane is that a semipermeable membrane such as an aromatic polyamide membrane or cellulose acetate is superimposed on a microporous porous support, and the thickness of the semipermeable membrane is 200 to 300 nm. A reverse osmosis membrane whose semipermeable membrane is an aromatic polyamide is widely used for industrial use because of its excellent water permeability and electrolyte removal performance. The reverse osmosis membrane module uses a spacer and a reverse osmosis membrane bonded together, and the distance between the spacer and the reverse osmosis membrane is narrow.

Japanese Patent No. 3864817 JP 2005-518272 A JP-A-9-29252 JP 2005-111407 A JP 2006-233935 A

However, in the case of Patent Document 1 and Patent Document 2, since the flow path has only about 200 nanometers, there is a problem that clogging is likely to occur and the amount of water permeation is likely to decrease.

Patent Document 4 discloses a method of using an adsorbent to remove organic substances dissolved in water when water treatment is performed using a reverse osmosis membrane. The adsorbent has a problem that a large amount of adsorbent is required because the surface area is insufficient.

Further, in Patent Document 3, a contrivance is made to widen the spacer interval, but it is still about 400 nanometers and there is almost no effect of suppressing clogging.

When the reverse osmosis membrane is contaminated and clogged, the pressure (power) is increased to obtain a certain amount of permeation, leading to an increase in the power cost of the pump. Moreover, although a reverse osmosis membrane is wash | cleaned in order to remove contamination, a reverse osmosis membrane deteriorates gradually with a chemical | medical solution, and the ion rejection rate falls. As these progress, reverse osmosis membrane exchange is required. When replacing the reverse osmosis membrane, it is necessary to stop the operation for a long time, which makes it difficult to stably supply reclaimed water. In particular, in sewage regeneration treatment, clogging with dissolved organic matter is a major issue because the water supplied to the reverse osmosis membrane contains a large amount of organic matter.

There are two main mechanisms of reverse osmosis clogging caused by dissolved organic matter. First, organic substances are adsorbed on the surface of the reverse osmosis membrane, blocking the surface state of the membrane and pores at the molecular level, thereby deteriorating membrane performance. The second is largely related to the reverse osmosis membrane module, and occurs because dissolved organic substances are insolubilized and deposited between the membrane surface and between the membrane and the spacer, and block the flow path. In particular, in the case of the second module structure, it occurs on the inlet side of the module, and the permeated water amount is reduced in spite of the absence of membrane deterioration at the back of the module. As a conventional method for removing dissolved organic matter, Patent Document 1 discloses a method using an adsorbent made of the same material as the reverse osmosis membrane. Moreover, in order to enlarge the contact area of a treated water and a reverse osmosis membrane, the patent document 2 using a fibrous polymer and a ceramic porous body is disclosed.

In order to solve the above problems, for example, in a reverse osmosis membrane structure that performs reverse osmosis membrane treatment on water to be treated, a first surface into which the water to be treated flows and a first surface from which the water to be treated flows out Two surfaces, a plurality of first flow paths formed side by side in a direction intersecting the longitudinal direction thereof, and a plurality of first flow paths formed side by side in the first flow path and not communicating with the first surface The first flow path, and a porous partition wall formed between the first flow path and the second flow path and permeable to the water to be treated. A reverse osmosis membrane structure comprising a reverse osmosis membrane in a partition wall between a path and the second flow path is provided.

In the present invention, organic substances in the water to be treated can be efficiently removed, clogging is less likely to occur, the frequency of cleaning and replacement of the reverse osmosis membrane is reduced, the running cost is reduced, and water can be stably supplied.

It is a water treatment flowchart using the reverse osmosis membrane module concerning the Example of this invention. It is a schematic diagram of the structure of the reverse osmosis membrane module concerning the Example of this invention. It is the schematic diagram which looked at the reverse osmosis membrane structure concerning the Example of this invention from the upper surface. It is the schematic diagram which looked at the reverse osmosis membrane structure concerning the Example of this invention from the side. It is sectional drawing of the reverse osmosis membrane structure concerning Example 1 of this invention. It is the molecular structure of the polymeric material concerning the Example of this invention. It is sectional drawing of the reverse osmosis membrane structure concerning Example 2 of this invention. It is sectional drawing of the reverse osmosis membrane structure concerning Example 3 of this invention. It is an outline of polymer modification to a ceramic filter. It is a GPC measurement result concerning the Example of this invention. It is a TOC measurement result concerning the Example of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view of a water treatment facility according to an embodiment of the present invention. The water treatment facility separates water tank 2 for temporarily storing sewage primary treated water (treated water), pump 3 for pressurizing treated water, and purified water and sewage into pressurized treated water. And a reverse osmosis membrane module. Temporary sewage treatment water is a series of treatments that removes dust, etc. through a screen, adds fine flocculant such as sand, settles and removes it, and decomposes organic matter using microorganisms. Water. In the sewage primary treated water, dissolved substances such as salts and dissolved organic substances are contained, and the reverse osmosis membrane module separates into purified water with a small amount of dissolved substances and sewage with concentrated dissolved substances.

In this embodiment, sewage regeneration treatment is taken as an example, but the reverse osmosis membrane module 1 is also used for seawater desalination, pure water production used for the production of precision electronic equipment such as semiconductors, and advanced water treatment. Can do.

FIG. 2 is a side view of an example of the reverse osmosis membrane module 1 used in the sewage treatment apparatus. The reverse osmosis membrane module 1 was a structure having a porous ceramic honeycomb structure 6 having a ceramic honeycomb structure. A ceramic honeycomb structure 6 is accommodated by a filter support 4 in a housing 5 (acrylic storage container) via a gripping member. The support 4 allows water to pass through without resistance, and when water is permeated at 0.1 MPa, the change in position at the center of the long axis is within 5% of the length of the fixed end in the long axis direction. It is only necessary to use a material having a strength, thickness, and holding method, and a material that does not have an eluate to water. For example, in the case of resin, mesh spacers such as polyethylene, polypropylene, polyethylene terephthalate, polystyrene, etc. A mesh such as stainless steel or titanium, a punching metal, or the like can be used. In this example, a punching metal having a thickness of 1 mm was used as the support 4. In addition, the water to be treated is sealed between the ceramic honeycomb structure 6 and the housing 5 so that the treated water always passes through the ceramic honeycomb structure 6. The upstream side of the ceramic honeycomb structure 6 has an inflow port through which treated water flows, and the downstream side of the treated water is divided into purified water and sewage. There are two waterways called outlets from which water flows out.

3 is a top view of the ceramic honeycomb structure 6, FIG. 4 is a perspective view thereof, and FIG. 5 is a cross-sectional view thereof. The ceramic honeycomb structure 6 is formed with a large number of flow paths 9 partitioned by porous partition walls. As shown in the figure, the sealing portions 12 are alternately formed on the end face of the flow path 9 on the side where the treated water flows, so that the water can permeate through the partition walls 7. The flow path in which the sealing part 12 is not formed is referred to as a first flow path 9a, and the flow path in which the sealing part 12 is formed is referred to as a second flow path 21b. The partition wall 7 has a large number of communication holes communicating with the flow paths 9 by holes due to the porosity. For the sealing portion 12, the same material as the ceramic honeycomb filter 6, an organic material, an inorganic material, or the like that does not dissolve in water can be used. On the downstream side (right side of the drawing) of the flow paths 9, water paths formed of tubes or the like are connected to the respective flow paths 9. Purified water flows through the water channel connected to the first flow path 9a, and dirty water flows through the water channel connected to the second flow path 9b. The water channels connected to the first flow channel 9a merge, and the water channels connected to the second flow channel 9b merge to flow out of the reverse osmosis membrane module 1.

Furthermore, the partition wall 7 is coated with a polymer material 11. The portion where the polymer material 11 is applied is the entire surface of the partition wall 7 and may be on the first flow path 9a side or the second flow path 9b side. The surface of the partition wall 7 is covered with a semipermeable membrane of the polymer material 11 and used as a reverse osmosis membrane.

The function of the ceramic honeycomb structure 6 of this example will be described with reference to FIG. The treated water pressurized by the pump 3 reaches the reverse osmosis membrane module 1. In FIG. 5, the water to be treated that has reached the left side of the drawing proceeds into the ceramic honeycomb structure 6 from the inlet of the first flow path 9a where the sealing portion 12 is not formed. Here, a part of the water to be treated passes through the partition wall 7 to which the polymer material 11 is applied and functions as a reverse osmosis membrane, and flows into the second flow path 9b. The water to be treated that has passed through the reverse osmosis membrane becomes purified water having a reduced dissolved substance concentration, and flows out from the outlet (right side of the drawing) of the second channel. On the other hand, the water to be treated that has not permeated through the partition walls 7 has a high dissolved substance concentration and flows out from the outlet of the first flow path 9a as dirty water.

The main body of the partition wall 7 is made of ceramics, has a role as an adsorbent using the physical adsorption phenomenon of ceramics, and adsorbs the dissolved matter contained in the water to be treated that passes therethrough. When the polymer material 11 is provided on the second channel 9b side of the partition wall 7, the water to be treated passes through the ceramic partition wall 7 before passing through the polymer material 11 as a reverse osmosis membrane. At this time, since the ceramic adsorbs the dissolved matter in the water to be treated, clogging of the reverse osmosis membrane can be suppressed and the replacement frequency can be reduced. Compared to the polymer film 11, the partition wall 7 has a coarser mesh and is more durable against clogging. In such a structure, the adsorbent and the reverse osmosis membrane used to prevent clogging of the reverse osmosis membrane are performed in one structure.

A method for manufacturing the ceramic honeycomb structure 6 will be described. For application of the polymer material 11, an ultrafine needle having a micrometer order needle tip used for medical use or the like is used. First, it is possible to adopt a method of inserting the needle to the back side of the flow path 9 and pulling out the needle while spraying. In the method of coating so as to form a polymer film having a film thickness of 100 to 300 nm along the flow path 9 on the surface of the partition wall 7, a porous film that is denser than the pores on the inner wall of the ceramic filter is formed as necessary. A composite film structure in which a desired polymer film is formed after the formation may be used. This polymer membrane 11 functions as a semipermeable membrane and has a role of a reverse osmosis membrane.

Intermolecular interactions affect the mechanism by which reverse osmosis membranes adsorb organic matter. From the analysis of the adsorbed organic matter, a polymer containing a —NH— bond having a high affinity for a carbonyl group, a carboxyl group, or an aromatic ring is preferably used as the reverse osmosis membrane material. Examples of the polymer containing a —NH— bond in the repeating unit include polyamide, polyimide, polyurethane, urea resin, polypeptide (protein), polyethyleneimine, polybenzimidazole, and polybenzoxazole. As other materials, materials containing —NH— bonds in the side chain or main chain can also be used. FIG. 6 shows the chemical structure of the polymer. Examples include polyallylamine and polyvinylamine. In addition, those having a carbonyl group or a siloxane structure in the main chain or side chain may be used because of the affinity for —NH— bond and siloxanes. Furthermore, the structure contained in the main chain and the side chain is not limited to one type, and by including a plurality of structures, a wide variety of mixtures contained in water can be adsorbed and the adsorption efficiency can be improved. .

As the material of the reverse osmosis membrane, commonly used polyamide and cellulose acetate can be used, but are not limited thereto.

Further, a photocatalyst may be supported on the porous filter or the polymer material in order to decompose the organic matter. As the photocatalyst, titanium oxide, strontium titanate, zinc oxide, iron oxide, tungsten oxide and the like can be used, but are not limited thereto.

By purifying the water to be treated using such a reverse osmosis membrane, it is possible to efficiently remove organic substances with a large surface area in a place where the polymer is not applied, and the flow path of the reverse osmosis membrane is wide. Therefore, clogging is less likely to occur, the frequency of cleaning and replacement of the reverse osmosis membrane can be reduced, and the running cost can be reduced.

The honeycomb structure 6 on which the adsorbent is supported is manufactured as follows. Prepare powders of kaolin, talc, silica, alumina, etc. and make cordierite so that the mass ratio is SiO ₂ : 48-52%, Al ₂ O ₃ : 33-37%, MgO: 12-15% Prepare a raw material powder, add a binder such as methylcellulose, hydroxypropylmethylcellulose, and a lubricant to this powder, mix thoroughly in a dry process, add a specified amount of water, and perform sufficient kneading to plasticize the ceramic clay. Create Next, the clay is extruded using an extrusion mold, cut, and dried to obtain a dried body having a honeycomb structure. Next, the outer peripheral portion of the dried body is removed by processing, and the flow path located on the outer periphery does not have a partition wall with the outside, thereby forming a honeycomb structure having a concave groove that opens to the outside and extends in the axial direction. A dried body having a honeycomb structure was obtained. Furthermore, after firing at 1400 ° C., a coating agent containing cordierite particles and colloidal silica is applied to the flow path that opens to the outside and is fired. The cordierite-type ceramic honeycomb structure 6 is formed with a large number of flow paths. As an example of the structure of the honeycomb structure 6, the outer diameter (diameter) is 5.66 inches, the total length is 6 inches, the partition wall thickness is 0.32 mm, the partition wall pitch is 1.57 mm, and the initial pressure loss is 0.85 mmAq (at 7). 0.5 Nm ³ / min). There exists patent document 5 as an example of the manufacturing method of a ceramic honeycomb filter.

In this ceramic honeycomb filter, polyamide was dissolved in N-methylpyrrolidone to prepare a 0.5% polyamide NMP solution. Polyamide is obtained by polymerizing 4,4'-oxydianiline and isophthaloyl dichloride as monomers. As shown in FIG. 9, this polymer solution 14 was put in a beaker 13, impregnated with a ceramic filter, and polyamide was absorbed into the ceramic filter and applied. When the polymer solution reached the upper surface of the ceramic filter, the ceramic filter was pulled up. The polymer material was applied to the inside of the flow path with the needle described above. Thereafter, it was dried in an oven at 130 ° C. for 24 hours.

Example 2 will be described with reference to FIG. The difference between the present embodiment and the first embodiment is that the intermediate sealing portion 10 is provided and that the polymer material 11 is formed only on the partition wall 7 on the downstream side of the intermediate sealing portion 10. is there. In the present embodiment, a sealing portion 12 is provided at the upstream end of the first flow path 9a. Moreover, the intermediate sealing part 10 exists in the upstream of the 2nd flow path 9b, and the 3rd flow path 9c is the upstream of the same hole.

The function of the ceramic structure 6 of the present embodiment will be described with reference to FIG. The treated water pressurized by the pump 3 reaches the reverse osmosis membrane module 1. In FIG. 5, the water to be treated that has reached the left side of the drawing proceeds into the ceramic structure 6 from the inlet of the third flow path 9 c where the sealing portion 12 is not formed. Since the third flow path 9c is blocked by the intermediate sealing portion 10, almost all of the inflowed water to be treated permeates through the partition wall 7 where no polymer material is formed, and the first flow It flows into the path 9a. At this time, organic substances that cause clogging as a reverse osmosis membrane are adsorbed by the ceramics constituting the partition wall 7. Moreover, since the pores of the ceramic forming the partition are larger than the pores of the reverse osmosis membrane, the water to be treated can pass through the partition with a relatively small resistance.

The treated water that has flowed into the first flow path follows the same path as in the first embodiment. Specifically, a part of the water to be treated passes through the partition wall 7 to which the polymer material 11 is applied and functions as a reverse osmosis membrane, and flows into the second flow path 9b. The water to be treated that has passed through the reverse osmosis membrane becomes purified water having a reduced dissolved substance concentration, and flows out from the second flow path 9b. On the other hand, the water to be treated that has not permeated through the partition walls 7 has a high dissolved substance concentration and flows out through the first flow path 9a as sewage.

According to the present embodiment, the dissolved water is adsorbed in the partition wall 7 that passes when the water to be treated that has flowed into the reverse osmosis membrane module moves from the third flow path 9c to the first flow path 9a. Adhesion of the dissolved matter on the reverse osmosis membrane surface is reduced, an increase in water resistance of the reverse osmosis membrane can be suppressed, and the frequency of replacement of the reverse osmosis membrane structure can be reduced.

Example 3 will be described with reference to FIG. The difference between the present embodiment and the second embodiment is that the polymer material 11 is also formed on the partition wall 7 upstream of the intermediate sealing portion 10 in the present embodiment. However, the thickness of the polymer material 11 is different. That is, a polymer film having two roles is provided depending on the method of applying a polymer material to the ceramic filter.

To the upstream partition wall 7 (the partition wall 7 between the third flow path 9c and the first flow path 9a), a polymer material that adsorbs and removes organic matter is removed from the surface of the partition wall and the surface of the pores of 5 to 50 μm inside. The entire surface or a part of the film is applied with a thickness that does not fill the pores inside the partition walls, preferably 100 nm or less. In this case, since the polymer film 11 is thin, it becomes a rough film due to the influence of the pores of the ceramic partition walls 7. And the to-be-processed water permeate | transmits the inside of the partition 7 with a small resistance, and the apply | coated polymer material 11a adsorbs and removes an organic substance dissolved in water. In the polymer film 11, dissolved substances such as organic substances permeate through the pores of the polymer material 11 and do not function as a reverse osmosis film, but function as an adsorbing substance that adsorbs the dissolved substance.

To the downstream partition wall 7 (the partition wall 7 between the first channel 9a and the second channel 9b), the film thickness along the channel 9 is formed on the surface of the partition wall 7 as in the first and second embodiments. Is applied to form a polymer film having a thickness of 100 to 300 nm. In this case, when the polymer material 11 is thick, the influence of the pores of the ceramic is reduced, and a dense film can be obtained. If necessary, a composite film structure in which a desired polymer film is formed after forming a porous film denser than the pores on the inner wall of the ceramic filter 6 may be used. This polymer membrane functions as a semipermeable membrane and has a role of a reverse osmosis membrane.

The ceramic partition wall 7 also adsorbs the lysate upstream of the reverse osmosis membrane and suppresses clogging of the reverse osmosis membrane, thereby extending the life. In the case of the polymer material 11, the reverse osmosis membrane and the material are Since they are the same or similar, it is easy to adsorb dissolved substances that cause clogging of the reverse osmosis membrane, and the effect of reducing the frequency of replacement of the reverse osmosis membrane is increased. Here, the upstream polymer film 11 and the downstream polymer film may be the same material or different materials. The same material is convenient for manufacturing. If different materials are used so that the upstream polymer film is more water-repellent and the downstream polymer film 11 is more hydrophilic, the adsorbing power of organic substances on the upstream polymer film 11 acting as an adsorbing material. And the organic matter is less likely to adhere to the polymer membrane 11 on the downstream side that functions as a reverse osmosis membrane.

According to the present embodiment, as in the second embodiment, the water to be treated that has flowed into the reverse osmosis membrane module is dissolved in the partition wall 7 that passes when moving from the third flow path 9c to the first flow path 9a. Since the substance is adsorbed, the adhesion of the dissolved substance to the reverse osmosis membrane surface is reduced. Here, by having the polymer material 11 on the ceramic of the partition wall 7, the adsorbing power of the dissolved material is increased, and an increase in water flow resistance of the reverse osmosis membrane can be suppressed. Can be reduced.

For the demonstration experiment of the ceramic structure 6 according to the present invention, 1 L of sewage primary treated water is filtered through a reverse osmosis membrane, and dissolved organic substances contained in the treated sewage are analyzed using size exclusion chromatography (GPC). A comparative study was conducted. The GPC conditions are as follows. The column is manufactured by Hitachi Chemical Co., Ltd., model number: GL-W550, column temperature: 41 ° C., sample volume: 20 μL, eluent: pure water, flow rate: 1.0 mL / min, detector (detection wavelength): UV ( 220 nm). As a result, as shown in FIG. 10, both the ceramic structure according to Example 2 and the ceramic honeycomb structure according to Example 3 had less dissolved organic matter after filtration than before filtration. Moreover, compared with Example 2 with no polyamide modification, Example 3 with polyamide modification was able to remove organic substances in the low molecular region.

In addition, the total carbon concentration (Total 汚 Organic Carbon, TOC) of the treated sewage was measured, and the change in the amount of dissolved organic matter was evaluated from the carbon amount. As shown in FIG. 11, any ceramic honeycomb structure has a TOC concentration <236 mg / L after filtration as compared to before filtration, and the adsorbent has an organic substance removing effect.

Moreover, when the reverse osmosis membrane shown in FIG. 8 produced in Example 3 was treated with sewage-treated water having a TOC concentration of 8 mg / L at a pressure of 2 MPa, the TOC of the purified water obtained was 1 mg / L. It was confirmed to be effective as an osmotic membrane.

DESCRIPTION OF SYMBOLS 1 ... Reverse osmosis membrane module, 2 ... Water storage tank, 3 ... Pump, 4 ... Filter support body, 5 ... Filter holding container (filter), 6 ... Ceramic structure ( Ceramic filter), 7 ... partition wall, 8 ... channel sealing part, 9 ... channel, 10 ... intermediate sealing part, 11 ... polymer, 13 ... beaker, 14 ..Polymer solution.

Claims

In the reverse osmosis membrane structure that performs reverse osmosis membrane treatment on the water to be treated,
A first surface into which treated water flows,
A second surface from which the treated water flows out;
A plurality of first flow paths formed side by side in a direction intersecting the longitudinal direction;
A plurality of second flow paths that are formed side by side with the first flow path and do not communicate with the first surface;
A porous partition wall formed between the first flow path and the second flow path and permeable to the water to be treated.
A reverse osmosis membrane structure comprising a reverse osmosis membrane in a partition wall between the first flow channel and the second flow channel.
In claim 1,
A reverse osmosis membrane structure, wherein the partition wall is made of ceramics.
In claim 1 or claim 2,
The first flow path communicates with the first surface and the second surface,
The reverse osmosis membrane structure, wherein the second flow path communicates with the second surface.
In any one of Claims 1 thru | or 3,
The reverse osmosis membrane structure is characterized in that the reverse osmosis membrane is formed on the second channel side of the partition wall.
In claim 1 or claim 2,
A reverse osmosis membrane structure comprising a plurality of third flow paths that are formed side by side with the first flow path across the partition wall and do not communicate with the second side.
In claim 5,
A reverse osmosis is characterized in that a sealing portion is formed in the middle of the flow path, the first surface side is the third flow path, and the second surface side is the second flow path. Membrane structure.
In claim 5 or claim 6,
The first flow path communicates with the second surface,
The second flow path communicates with the second surface,
The reverse osmosis membrane structure, wherein the third flow path communicates with the first surface.
In any of claims 5 to 7,
A reverse osmosis membrane structure comprising an adsorption material made of a polymer material in a partition wall between the first channel and the second channel.
In claim 8,
The reverse osmosis membrane is formed of a polymer material,
The reverse osmosis membrane structure is characterized in that the thickness of the reverse osmosis membrane is larger than the thickness of the adsorbing material.
In claim 9,
The reverse osmosis membrane structure, wherein the polymer material forming the reverse osmosis membrane and the polymer material forming the adsorbing material are the same material.
In any one of Claims 1 thru | or 10.
The first surface, the second surface and the partition walls are formed of a ceramic honeycomb having a honeycomb structure,
Any one of the first to third flow paths is formed by sealing a communication hole of the ceramic honeycomb that connects the first surface and the second surface with a sealing body. A reverse osmosis membrane structure.
In any one of Claims 1 thru | or 11,
The reverse osmosis membrane structure, wherein the partition wall includes a photocatalyst.
The reverse osmosis membrane structure according to any one of claims 1 to 12,
A housing covering the reverse osmosis membrane structure;
A to-be-treated water inlet port that communicates with the first channel or the third channel and into which the to-be-treated water flows;
A first treated water outlet through which the treated water flows out and communicates with the first flow path;
A second treated water outlet that communicates with the second flow path and through which the treated water that has passed through the reverse osmosis membrane flows out;
A reverse osmosis membrane module comprising: