JP2020093233A - Separation membrane module and separation membrane system - Google Patents

Abstract

To provide a separation membrane module which enables reduction of frequency of cleaning of the separation membrane module, and to provide a separation membrane system using the separation membrane module.SOLUTION: A separation membrane module (11) of the disclosure includes: a container (8) having a first undiluted solution inlet (11a), a first concentrated liquid outlet (11b), and a permeate outlet (11c); and multiple separation membrane elements (13) disposed within the container (8). Each of the separation membrane elements (13) has: a liquid collection pipe (61) connected to the permeate outlet (11c); and a separation membrane (62) wound around the liquid collection pipe (61). The multiple separation membrane elements (13) are arranged in parallel to each other within the container (8).SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a separation membrane module and a separation membrane system.

Separation membrane elements are used in various fields such as desalination of seawater, production of pure water, wastewater treatment, and crude oil mining. The separation membrane element includes, for example, a water collection pipe and a separation membrane wound around the water collection pipe, and is usually arranged in series inside the pressure vessel. A separation membrane system is a system equipped with a separation membrane element or a separation membrane module.

When treating raw water with a separation membrane system, contaminants such as organics deposit on the separation membrane element. When the pollutants are accumulated, the cross-sectional area of the raw water flow channel is reduced and the treatment efficiency is reduced. Therefore, it is desired that the contaminants deposited on the separation membrane element can be efficiently removed.

For example, Patent Document 1 describes a separation membrane module including a plurality of separation membrane elements arranged in series inside a pressure vessel. Patent Document 1 discloses that the separation membrane element is washed by combining forward flushing and reverse flushing.

International Publication No. 2015/041263 (Fig. 1)

In the separation membrane module described in Patent Document 1, it is not always easy to reduce the frequency of cleaning the separation membrane element. Therefore, there is a demand for a separation membrane module and a separation membrane system using the separation membrane module, which can reduce the frequency of cleaning of the separation membrane element.

This disclosure is
A container having a first stock solution inlet, a first concentrated solution outlet, and a permeate outlet
A plurality of separation membrane elements arranged inside the container,
Equipped with
Each of the plurality of separation membrane elements has a liquid collection tube connected to the permeate outlet, and a separation membrane wound around the liquid collection tube,
A separation membrane module is provided in which the plurality of separation membrane elements are arranged in parallel inside the container.

In another aspect, the present disclosure provides
At least one first separation membrane module;
At least one second separation membrane module connected in series to the first separation membrane module so as to filter the concentrated liquid discharged from the first separation membrane module;
Equipped with
A separation membrane system is provided, wherein the first separation membrane module is the above-mentioned separation membrane module.

According to the technique of the present disclosure, it is possible to provide a separation membrane module and a separation membrane system using the same, which can reduce the frequency of cleaning of the separation membrane element.

FIG. 1 is a configuration diagram of a separation membrane system according to Embodiment 1 of the present disclosure. FIG. 2 is a perspective view of the first separation membrane module. FIG. 3 is a developed perspective view of the separation membrane element. FIG. 4 is a configuration diagram of the separation membrane system according to the second embodiment of the present disclosure. FIG. 5 is a configuration diagram of the separation membrane system according to the third embodiment of the present disclosure.

According to the separation membrane module described in Patent Document 1, the separation membrane element arranged at the most upstream inside the pressure vessel is swiftly contaminated, and the water treatment capacity thereof is significantly deteriorated. When the fouling progresses, it is conceivable, for example, to replace only the most upstream arranged separation membrane element. However, due to the structure of the pressure vessel, it is difficult to replace only the most upstream separation membrane element. The operation must be shut down in order to replace the separation membrane element, which reduces the availability of the system.

The cleaning of the separation membrane element is performed, for example, by flowing a cleaning liquid containing a chemical into the pressure vessel while the separation membrane element is arranged inside the pressure vessel. The cleaning efficiency at this time depends on the position of the separation membrane element inside the pressure vessel. That is, among the plurality of separation membrane elements, the upstream separation membrane element has a high cleaning efficiency and the downstream separation membrane element has a low cleaning efficiency. Therefore, it is difficult to uniformly wash all the separation membrane elements, and it is necessary to perform washing in accordance with the most contaminated separation membrane element. As a method of solving this problem, there is a method of taking out the separation membrane element from the pressure vessel and individually washing the separation membrane element. However, this method requires a lot of labor and cost. Based on such knowledge, the present inventors have completed the separation membrane module and the separation membrane system of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The present disclosure is not limited to the following embodiments.

(Embodiment 1)
FIG. 1 shows the configuration of a separation membrane system 100 according to Embodiment 1 of the present disclosure. FIG. 2 shows the configuration of the first separation membrane module 11 used in the separation membrane system 100. The separation membrane system 100 includes a first separation membrane module 11 and a second separation membrane module 12. The first separation membrane module 11 and the second separation membrane module 12 are connected in series so that the concentrated water discharged from the first separation membrane module 11 is further filtered by the second separation membrane module 12.

The liquid to be treated (filtered) by the separation membrane system 100 includes water (raw water). For simplicity, the term "water" is used herein as a representative of liquid.

The first separation membrane module 11 includes a container 8 and a plurality of separation membrane elements 13. The plurality of separation membrane elements 13 are arranged inside the container 8. Inside the container 8, the plurality of separation membrane elements 13 are arranged in parallel. Inside the container 8, the raw water flows through any of the plurality of separation membrane elements 13. According to such a configuration, the area of the end surface of the separation membrane element 13 in contact with the raw water increases, so that the accumulation of contaminants on the end surface of the separation membrane element 13 is suppressed. Therefore, it is possible to increase the time required for cleaning or the time required for replacement of the separation membrane element 13. Since the contaminants are removed by the first separation membrane module 11, the accumulation of the contaminants on the downstream second separation membrane module 12 is suppressed. That is, the frequency of cleaning with the cleaning liquid containing the chemical in the separation membrane system 100 is reduced. It is also easy to replace only the separation membrane element 13 of the first separation membrane module 11.

According to this embodiment, each of the plurality of separation membrane elements 13 is located most upstream in the separation membrane system 100. In other words, the leading separation membrane element 13 that is most likely to get dirty is collected in the container 8. With such a structure, the pollutant can be easily discharged during cleaning, and the cleaning effect such as reverse cleaning can be easily obtained. By arranging the plurality of separation membrane elements 13 that are most likely to be contaminated in parallel, it is possible to extend the period until each end surface of the separation membrane element 13 is significantly contaminated by raw water.

The container 8 is a cylindrical container having pressure resistance. The container 8 has a first raw water inlet 11a, a first concentrated water outlet 11b, and a permeated water outlet 11c. Raw water is introduced into the container 8 through the first raw water inlet 11a. The concentrated water is discharged to the outside of the container 8 through the first concentrated water outlet 11b. The permeated water is discharged to the outside of the container 8 through the permeated water outlet 11c. In this embodiment, a plurality of permeated water outlets 11c are provided in the container 8. However, only one permeated water outlet 11c may be provided in the container 8.

The container 8 further has a second raw water inlet 11d and a second concentrated water outlet 11e. Raw water is introduced into the container 8 through the second raw water inlet 11d. The concentrated water is discharged to the outside of the container 8 through the second concentrated water outlet 11e. The internal space of the container 8 is partitioned into a first side space 8a and a second side space 8b. The first side space 8a is a space where the first raw water inlet 11a and the second concentrated water outlet 11e are located. The second side space 8b is a space in which the second raw water inlet 11d and the first concentrated water outlet 11b are located. With such a configuration, raw water can be made to flow from both directions to each separation membrane element 13 of the first separation membrane module 11. Even if the efficiency of water treatment is reduced by the pollutants deposited on one end surface of the separation membrane element 13, the raw water is introduced from the other end surface of the separation membrane element 13 so that the end surface on which the pollutants are not deposited is treated as water. Can be used for processing. By using both end faces of the separation membrane element 13, water can be efficiently treated, and the time until cleaning is required or the time until the separation membrane element 13 needs to be replaced is further earned. be able to.

Further, by switching the flow direction of the raw water in the first separation membrane module 11 regularly or irregularly, the contaminants deposited on the end surface of the separation membrane element 13 located in the first side space 8a can be removed from the second side space 8b. It can be removed by flowing the raw water toward the first side space 8a. The contaminants deposited on the end surface of the separation membrane element 13 located in the second side space 8b can be removed by flowing raw water from the first side space 8a toward the second side space 8b. That is, the contaminants deposited on the separation membrane element 13 can be removed by the reverse cleaning. As a result, the frequency of cleaning with the cleaning liquid containing a chemical can be further reduced, and the life of the separation membrane element 13 can be extended. When the life of the separation membrane element 13 is extended, the frequency of replacement of the separation membrane element 13 can be reduced, which is economical.

Furthermore, when it is difficult to remove contaminants by switching the flow direction of the raw water, the separation membrane element 13 is washed with a washing liquid. Since the separation membrane elements 13 are arranged in parallel inside the container 8, the cleaning liquid is evenly flowed to each separation membrane element 13 as compared with the separation membrane module in which the separation membrane elements are arranged in series inside the container. be able to. Furthermore, the cleaning liquid can be made to flow from both directions to each separation membrane element 13 of the first separation membrane module 11. In this case, a high cleaning effect can be obtained.

The first side space 8a and the second side space 8b are partitioned by a partition 30, for example. The structure and material of the partition 30 are not particularly limited as long as the liquid can be prevented from flowing between the first side space 8a and the second side space 8b. In one example, the partition 30 can be a seal member made of a rubber material.

The number of separation membrane elements 13 in the first separation membrane module 11 is not particularly limited and is, for example, 2 to 7. As shown in FIG. 2, in this embodiment, seven separation membrane elements 13 are arranged in a honeycomb shape inside a cylindrical container 8.

FIG. 3 shows the separation membrane element 13 partially developed. The separation membrane element 13 is composed of a water collection pipe 61, a separation membrane 62, a raw water spacer 63, and a permeated water spacer 64. In detail, the separation membrane element 13 is composed of a plurality of separation membranes 62, a plurality of raw water spacers 63 and a plurality of permeated water spacers 64.

The plurality of separation membranes 62 are superposed on each other, sealed on three sides so as to have a bag-like structure, and wound around the water collection pipe 61. A raw water spacer 63 is arranged between the separation membranes 62 so as to be located outside the bag-shaped structure. The raw water spacer 63 secures a space as a raw water flow path between the separation membranes 62. A permeate spacer 64 is disposed between the separation membranes 62 so as to be located inside the bag-shaped structure. The permeated water spacer 64 secures a space as a permeated water flow path between the separation membranes 62. The open end of the bag-shaped structure is connected to the water collection pipe 61 so that the permeate flow path communicates with the water collection pipe 61.

The separation membrane element 13 may be a spiral type separation membrane element. The material, structure, characteristics, manufacturing method and the like of the spiral type separation membrane element are well known. Therefore, the existing spiral type separation membrane element can be applied to the separation membrane module 11 with a minimum design change.

The separation membrane 62 is, for example, a reverse osmosis membrane, a nanofiltration membrane, an ultrafiltration membrane or a microfiltration membrane. Separation membrane 62 is typically a reverse osmosis membrane or a nanofiltration membrane.

The water collecting pipe 61 plays a role of collecting permeated water that has permeated each separation membrane 62 and guiding the collected permeated water to the outside of the separation membrane element 13. The water collection pipe 61 is provided with a plurality of through holes 61h at predetermined intervals along the longitudinal direction thereof. The permeated water flows into the water collecting pipe 61 through these through holes 61h.

As shown in FIG. 2, each water collecting pipe 61 of the separation membrane element 13 is connected to a common collecting pipe 65. The collecting pipe 65 is connected to the permeate passage 20. With such a configuration, the permeated water generated in the separation membrane module 13 can be efficiently collected. When the collecting pipe 65 exists inside the container 8, the container 8 may have only one permeate outlet 11c.

In the present embodiment, the longitudinal direction of each of the water collecting pipes 61 of the plurality of separation membrane elements 13 in the first separation membrane module 11 is parallel to the gravity direction. Since the contaminants deposited on the separation membrane element 13 easily fall by gravity under the influence of gravity, a high cleaning effect can be obtained when the cleaning operation is performed in the separation membrane system 100. Note that "the longitudinal direction is parallel to the direction of gravity" does not necessarily mean that it is mathematically completely parallel. The longitudinal direction of the water collection pipe 61 may be inclined with respect to the gravity direction within a range where the intended effect is obtained (for example, 3 degrees or less).

The second separation membrane module 12 includes a container 9 and a plurality of separation membrane elements 23. The plurality of separation membrane elements 23 are arranged inside the container 9. Inside the container 9, the plurality of separation membrane elements 23 are arranged in series. By using the second separation membrane module 12 having such a structure in combination with the first separation membrane module 11, a high salt rejection rate and a high permeated water amount can be achieved. However, the structure of the second separation membrane module is not particularly limited. For example, an arbitrary separation membrane module in an existing water treatment system can be regarded as the second separation membrane module 12, and the first separation membrane module 11 can be arranged upstream thereof. With such a configuration, the configuration of the present embodiment can be adopted in an existing water treatment system without causing a significant design change.

The container 9 is a cylindrical container having pressure resistance. The container 9 has a raw water inlet 12a, a concentrated water outlet 12b, and a permeated water outlet 12c. The concentrated water discharged from the first separation membrane module 11 is introduced into the container 9 as raw water through the raw water inlet 12a. The concentrated water is discharged to the outside of the container 9 through the concentrated water outlet 12b. The permeated water is discharged to the outside of the container 9 through the permeated water outlet 12c.

The separation membrane element 23 is, for example, a spiral type separation membrane element. The structure of the separation membrane element 23 may be the same as or different from the structure of the separation membrane element 13. The type of separation membrane used in the separation membrane element 13 may be the same as or different from the type of separation membrane used in the separation membrane element 23.

The number of separation membrane elements 23 in the second separation membrane module 12 is not particularly limited and is, for example, 1 to 10.

The separation membrane system 100 further includes a booster pump 15, a first raw water path 18 and a first concentrated water path 21. The booster pump 15 is arranged in the first raw water path 18. The first raw water path 18 is connected to the first raw water inlet 11 a of the container 8. The raw water is pressurized by the booster pump 15 and guided to the container 8 through the first raw water path 18. The first concentrated water path 21 is connected to the first concentrated water outlet 11b of the container 8. The concentrated water is discharged to the outside of the container 8 through the first concentrated water path 21.

The separation membrane system 100 further includes a second raw water path 19 and a second concentrated water path 24. The second raw water path 19 is connected to the second raw water inlet 11d of the container 8. The raw water is pressurized by the booster pump 15 and guided to the container 8 through the second raw water path 19. The second concentrated water path 24 is connected to the second concentrated water outlet 11e of the container 8. The concentrated water is discharged to the outside of the container 8 through the second concentrated water path 24.

In the present embodiment, the second raw water route 19 is branched from the first raw water route 18. The second concentrated water path 24 joins the first concentrated water path 21.

The separation membrane system 100 further includes a path switching mechanism 14. The path switching mechanism 14 is configured to switch between the first operation mode and the second operation mode. The first operation mode is an operation mode in which raw water is guided to the first raw water path 18 connected to the first raw water inlet 11a. The second operation mode is an operation mode in which the raw water is guided to the second raw water path 19 connected to the second raw water inlet 11d. In the present embodiment, the route switching mechanism 14 is provided at the connecting portion between the first raw water route 18 and the second raw water route 19. According to the path switching mechanism 14, the flow direction of the raw water or the cleaning liquid in the first separation membrane module 11 can be easily switched at any timing.

The separation membrane system 100 further includes a path switching mechanism 25. The path switching mechanism 25 is configured to switch between the first operation mode and the second operation mode. The first operation mode is an operation mode in which the concentrated water is guided to the first concentrated water passage 21 connected to the first concentrated water outlet 11b. The second operation mode is an operation mode in which the concentrated water is guided to the second concentrated water passage 24 connected to the second concentrated water outlet 11e. In the present embodiment, the path switching mechanism 25 is provided at the connecting portion between the first concentrated water path 21 and the second concentrated water path 24. According to the path switching mechanism 25, the flow direction of the raw water or the cleaning liquid in the first separation membrane module 11 can be easily switched at any timing.

The path switching mechanisms 14 and 25 include valves, for example. In the present embodiment, the path switching mechanisms 14 and 25 are three-way valves, respectively. The path switching mechanisms 14 and 25 may be composed of a plurality of open/close valves. For example, a three-way valve can be replaced by two on-off valves.

The separation membrane system 100 further includes a path 22. The path 22 connects the path switching mechanism 25 and the second separation membrane module 12. Through the path 22, the concentrated water discharged from the first separation membrane module 11 is supplied to the second separation membrane module 12 as raw water. The path 22 is provided with a booster pump 17 for increasing the pressure.

The separation membrane system 100 further includes a tank 16, a permeate passage 20, and a permeate passage 26. The tank 16 temporarily stores the permeated water generated in the first separation membrane module 11 and the second separation membrane module 12. The permeated water path 20 is connected to the first separation membrane module 11 and guides the permeated water generated in the first separation membrane module 11 to the tank 16. In detail, the permeated water passage 20 connects the permeated water outlet 11c of the container 8 and the tank 16. The permeated water path 26 is connected to the second separation membrane module 12 and guides the permeated water generated in the second separation membrane module 12 to the tank 16. Specifically, the permeated water path 26 connects the permeated water outlet 12c of the container 9 and the tank 16.

The separation membrane system 100 further includes a concentrated water path 28. The concentrated water path 28 is connected to the second separation membrane module 12. The concentrated water generated in the second separation membrane module 12 is discharged to the outside of the container 9 through the concentrated water outlet 12b. Specifically, the concentrated water path 28 is connected to the concentrated water outlet 12 b of the container 9.

If necessary, devices such as valves and sensors may be arranged in each path. A tank that can temporarily store a liquid such as raw water, permeated water, and concentrated water may be provided on the route.

Next, the operation of the separation membrane system 100 will be described.

(First operation mode)
The first operation mode of this embodiment will be described. In the first operation mode, the route switching mechanisms 14 and 25 are operated so that the raw water is guided to the first raw water route 18 and the concentrated water is guided to the first concentrated water route 21. Raw water is introduced into the container 8 through the first raw water path 18 and the first raw water inlet 11a. Raw water is divided into a plurality of flows in the first side space 8a, flows in parallel through each of the plurality of separation membrane elements 13, and is filtered. As a result, concentrated water and permeated water are generated in each separation membrane element 13. A plurality of streams of concentrated water join in the 2nd side space 8b. The concentrated water, which is the concentrated raw water, is discharged from the separation membrane element 13 and then discharged to the outside of the container 8 through the first concentrated water outlet 11b. The permeated water is discharged to the outside of the container 8 through the water collection pipes 61 of the plurality of separation membrane elements 13 and the permeated water outlet 11c.

The concentrated water is discharged to the outside of the container 8 through the first concentrated water path 21 and introduced into the path 22 through the path switching mechanism 25. The permeated water is supplied to the tank 16 through the permeated water path 20 and is temporarily stored in the tank 16.

The concentrated water is pressurized by the booster pump 17 and is supplied to the second separation membrane module 12 through the path 22. Raw water, which is concentrated water of the first separation membrane module 11, is filtered in the second separation membrane module 12. Concentrated water and permeated water are generated in the second separation membrane module 12. The permeated water is supplied to the tank 16 through the permeated water path 26. The concentrated water is guided to a predetermined place (for example, a tank of raw water) through the concentrated water path 28.

(Second operation mode)
Next, the second operation mode of this embodiment will be described. In the second operation mode, the path switching mechanisms 14 and 25 are operated so that the raw water is guided to the second raw water path 19 and the concentrated water is guided to the second concentrated water path 24. Raw water is introduced into the container 8 through the second raw water path 19 and the second raw water inlet 11d. Raw water is divided into a plurality of flows in the second side space 8b, flows in parallel through each of the plurality of separation membrane elements 13, and is filtered. As a result, concentrated water and permeated water are generated in each separation membrane element 13. A plurality of flows of concentrated water join in the 1st side space 8a. The concentrated water is discharged from the separation membrane element 13 and then discharged to the outside of the container 8 through the second concentrated water outlet 11e. The permeated water is discharged to the outside of the container 8 through the water collection pipes 61 of the plurality of separation membrane elements 13 and the permeated water outlet 11c.

The concentrated water is discharged to the outside of the container 8 through the second concentrated water path 24 and introduced into the path 22 through the path switching mechanism 25. The permeated water is supplied to the tank 16 through the permeated water path 20 and is temporarily stored in the tank 16.

By switching the first operation mode and the second operation mode regularly or irregularly, the flow direction of the raw water in the first separation membrane module 11 can be switched. The contaminants deposited on the separation membrane element 13 can be removed by the reverse washing for switching the flow direction of the raw water. As a result, the frequency of cleaning with the cleaning liquid containing a chemical can be further reduced, and the life of the separation membrane element 13 can be extended. When the life of the separation membrane element 13 is extended, the frequency of replacement of the separation membrane element 13 can be reduced, which is economical.

The flow direction of the raw water in the first separation membrane module 11 can be reversed, while the flow direction of the raw water in the second separation membrane module 12 may be constant. In this case, the configuration for reversing the flow direction of the raw water in the second separation membrane module 12 can be omitted.

Hereinafter, some other embodiments will be described. Elements common to the first embodiment and other embodiments are given the same reference numerals, and explanations thereof may be omitted. The description regarding each embodiment can be applied to each other as long as there is no technical inconsistency. The respective embodiments may be combined with each other as long as there is no technical conflict.

(Embodiment 2)
FIG. 4 shows the configuration of the separation membrane system 200 according to the second embodiment. The separation membrane system 200 differs from the separation membrane system 100 described with reference to FIG. 1 in that it includes a plurality of first separation membrane modules 11. The plurality of first separation membrane modules 11 are connected in parallel with each other. Raw water flows through any of the plurality of first separation membrane modules 11 and is guided to the second separation membrane module 13. With such a configuration, the area of the end surface of the separation membrane element 13 in contact with the raw water is further increased, so that the time until the cleaning is required or the time until the separation membrane element 13 needs to be replaced is further earned. be able to. Since the contaminants are removed by the plurality of first separation membrane modules 11, the accumulation of the contaminants on the downstream second separation membrane module 12 is further suppressed. That is, the frequency of cleaning with the cleaning liquid containing the chemical in the separation membrane system 200 is further reduced.

The separation membrane system 200 includes two first separation membrane modules 11. However, the number of the first separation membrane modules 11 is not particularly limited, and is determined according to the processing capacity of the separation membrane system 200.

In the present embodiment, the first raw water path 18 is branched and connected to each of the plurality of first raw water inlets 11a. The second raw water path 19 is branched and connected to each of the plurality of second raw water inlets 11d. The first concentrated water path 21 is branched and connected to each of the plurality of first concentrated water outlets 11b. The second concentrated water path 24 is branched and connected to each of the plurality of second concentrated water outlets 11e. The permeate passage 20 is branched and connected to each of the plurality of permeate outlets 11c. By operating the route switching mechanisms 14 and 25, operation in either the first operation mode or the second operation mode can be performed.

According to this embodiment, even if the water treatment in one of the first separation membrane modules 11 selected from the plurality of first separation membrane modules 11 is stopped, the water treatment in the other first separation membrane module 11 can be continued. .. For example, the separation membrane element 13 of one of the first separation membrane modules 11 can be replaced or washed while the operation of the separation membrane system 200 is continued. Therefore, according to this embodiment, a high system operating rate can be achieved.

(Embodiment 3)
FIG. 5 shows the configuration of the separation membrane system 300 according to the third embodiment. The separation membrane system 300 differs from the separation membrane system 200 described with reference to FIG. 4 in that the separation membrane system 300 includes a plurality of second separation membrane modules 12. The plurality of second separation membrane modules 12 are connected in parallel with each other. Raw water flows through any of the plurality of first separation membrane modules 11. The concentrated water discharged from the plurality of first separation membrane modules 11 flows as raw water in any of the plurality of second separation membrane modules 12. According to this embodiment, in addition to the effects described in the first and second embodiments, the water treatment capacity can be improved.

The separation membrane system 300 includes two second separation membrane modules 12. However, the number of the second separation membrane modules 12 is not particularly limited, and is determined according to the processing capacity of the separation membrane system 300.

In the present embodiment, the path 22 is branched and is connected to each of the plurality of raw water inlets 12a. The permeate passage 26 is branched and is connected to each of the plurality of permeate outlets 12c.

Also in the present embodiment, by operating the path switching mechanisms 14 and 25, it is possible to carry out the operation in any one of the first operation mode and the second operation mode.

According to this embodiment, even if the water treatment in one of the second separation membrane modules 12 selected from the plurality of second separation membrane modules 12 is stopped, the water treatment in the other second separation membrane module 12 can be continued. .. For example, the separation membrane element 23 of one of the second separation membrane modules 12 can be replaced or washed while the operation of the separation membrane system 300 is continued. Therefore, according to this embodiment, a high system operating rate can be achieved.

The separation membrane system of the present disclosure can be used in various applications such as desalination of seawater, production of pure water, wastewater treatment, and crude oil mining.

8, 9 Container 8a First side space 8b Second side space 11 First separation membrane module 11a First raw water inlet 11b First concentrated water outlet 11c, 12c Permeate outlet 11d Second raw water inlet 11e Second concentrated water outlet 12th 2 Separation Membrane Module 12a Raw Water Inlet 12b Concentrated Water Outlet 13,23 Separation Membrane Element 14,25 Path Switching Mechanisms 15,17 Booster Pump 16 Tank 18 First Raw Water Pathway 19 Second Raw Water Pathway 20,26 Permeate Pathway 21 First Concentration Water path 22 Path 24 Second concentrated water path 28 Concentrated water path 30 Partition 61 Water collecting pipe 61h Through hole 62 Separation membrane 63 Raw water spacer 64 Permeate spacer 65 Collecting pipe 100, 200, 300 Separation membrane system

Claims (12)

A container having a first stock solution inlet, a first concentrated solution outlet, and a permeate outlet
A plurality of separation membrane elements arranged inside the container,
Equipped with
Each of the plurality of separation membrane elements has a liquid collection tube connected to the permeate outlet, and a separation membrane wound around the liquid collection tube,
A separation membrane module in which the plurality of separation membrane elements are arranged in parallel inside the container. The stock solution is introduced into the container through the first stock solution inlet, flows in parallel through each of the plurality of separation membrane elements, and then is discharged to the outside of the container through the first concentrated solution outlet,
The separation membrane module according to claim 1, wherein the permeated liquid is discharged to the outside of the container through the liquid collection pipe and the permeated liquid outlet of the plurality of separation membrane elements. The separation membrane module according to claim 1 or 2, wherein each of the plurality of separation membrane elements is a spiral separation membrane element. The separation membrane module according to any one of claims 1 to 3, wherein the liquid collection tube is connected to a common collection tube. The container further has a second stock solution inlet and a second concentrated solution outlet,
The inner space of the container has a first side space in which the first stock solution inlet and the second concentrated solution outlet are located, and a second side in which the second stock solution inlet and the first concentrated solution outlet are located. The separation membrane module according to any one of claims 1 to 4, which is partitioned into a space. At least one first separation membrane module;
At least one second separation membrane module connected in series to the first separation membrane module so as to filter the concentrated liquid discharged from the first separation membrane module;
Equipped with
A separation membrane system, wherein the first separation membrane module is the separation membrane module according to any one of claims 1 to 5. The separation membrane system according to claim 6, wherein the second separation membrane module has a container and a plurality of separation membrane elements arranged in series inside the container. The at least one first separation membrane module includes a plurality of the first separation membrane modules,
The separation membrane system according to claim 6 or 7, wherein a plurality of the first separation membrane modules are connected in parallel. The first separation membrane module is the separation membrane module according to claim 5,
A first stock solution path connected to the first stock solution inlet;
A second stock solution path connected to the second stock solution inlet;
A path switching mechanism that switches between a first operation mode that guides the stock solution to the first stock solution path and a second operation mode that guides the stock solution to the second stock solution path;
The separation membrane system according to any one of claims 6 to 8, further comprising: The first separation membrane module is the separation membrane module according to claim 5,
A first concentrate path connected to the first concentrate outlet;
A second concentrate passage connected to the second concentrate outlet;
A path switching mechanism that switches between a first operation mode that guides the concentrated liquid to the first concentrated liquid path and a second operation mode that guides the concentrated liquid to the second concentrated liquid path;
The separation membrane system according to any one of claims 6 to 9, further comprising: The separation membrane system according to any one of claims 6 to 10, wherein a longitudinal direction of each of the liquid collection tubes of the plurality of separation membrane elements in the first separation membrane module is parallel to a gravity direction. The at least one second separation membrane module includes a plurality of second separation membrane modules,
The separation membrane system according to any one of claims 6 to 11, wherein a plurality of the second separation membrane modules are connected in parallel.

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