Reverse osmosis membrane assembly and reverse osmosis device thereof

Abstract

The utility model provides a reverse osmosis membrane assembly and a reverse osmosis device thereof, and relates to the technical field of water treatment. The reverse osmosis membrane assembly provided by the utility model comprises a membrane shell and reverse osmosis membrane elements arranged in the membrane shell in series, the reverse osmosis membrane elements are divided into a water inlet end reverse osmosis membrane element and a concentrated water end reverse osmosis membrane element, and a central pipe of the water inlet end reverse osmosis membrane element is separated from a central pipe of the concentrated water end reverse osmosis membrane element. According to the reverse osmosis membrane assembly, water produced by the reverse osmosis membrane element at the water inlet end is used as final produced water, and water produced by the reverse osmosis membrane element at the concentrated water end is returned to the water inlet of the reverse osmosis membrane assembly for retreatment. When the reverse osmosis membrane assembly is used for seawater desalination, compared with a conventional reverse osmosis membrane assembly which is not separated, the reverse osmosis membrane assembly has the advantages that the desalination rate of a system is remarkably improved, and the energy consumption of the system is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a reverse osmosis membrane component and a reverse osmosis device thereof. Background Art

[0002] Reverse osmosis has the advantages of no phase change, normal temperature operation, simple equipment, high efficiency, small footprint, easy operation, low energy consumption, wide adaptability, high degree of automation and good water quality, and is widely used in various water treatment industries. The conventional high-pressure seawater desalination reverse osmosis system has a salt interception rate of 98.5-99%. With the increase of salt content and the service life of the reverse osmosis membrane, the desalination rate will gradually decrease. "Water Quality for Industrial Water Use in Urban Wastewater Recycling" (GB / T19923-2005) stipulates that the chloride content of recycled water is less than 250mg / L. If the chloride content in the inlet water exceeds 17000mg / L or the service life of the reverse osmosis increases, it is difficult to ensure that the fresh water produced by the first-level seawater desalination reverse osmosis system can meet the reuse standard, and it is often necessary to add a second-level reverse osmosis membrane, which will increase the system cost and operating energy consumption.

[0003] Reverse osmosis membrane elements are generally in the form of rolls, that is, the membrane used for filtration, the concentrated water separator, the water production net, etc. are wound on the central tube to form a cylindrical long tube roll membrane element. The conventional reverse osmosis central tube is used as a water production collection pipe, which is open in the middle and can produce water on both sides. On conventional reverse osmosis water treatment equipment, there are usually 4-7 membranes installed in a membrane shell. After the wastewater enters the water inlet end of the membrane shell and passes through each membrane, the concentration of the wastewater will increase. The concentration reaches the maximum at the last membrane, resulting in poor water quality of the water produced by the membrane, which in turn affects the overall water quality.

[0004] In view of this, the present utility model is proposed. Utility Model Content

[0005] The first purpose of the utility model is to provide a reverse osmosis membrane assembly to solve the above problems.

[0006] The second purpose of the utility model is to provide a reverse osmosis device.

[0007] In order to achieve the above objectives, the following technical solutions are adopted:

[0008] In a first aspect, the utility model provides a reverse osmosis membrane assembly, comprising a membrane shell and a reverse osmosis membrane element arranged in series inside the membrane shell;

[0009] One end of the reverse osmosis membrane assembly is a water inlet end, which is provided with a water inlet pipe, and the other end is a concentrated water end, which is provided with a concentrated water pipe; the water to be treated flows into the reverse osmosis membrane assembly from the water inlet pipe for treatment, and the concentrated water obtained after treatment is discharged from the concentrated water pipe;

[0010] The reverse osmosis membrane element close to the water inlet end is the water inlet end reverse osmosis membrane element; the reverse osmosis membrane element close to the concentrated water end is the concentrated water end reverse osmosis membrane element;

[0011] A partition between the central tube of the reverse osmosis membrane element at the water inlet end and the central tube of the reverse osmosis membrane element at the concentrated water end;

[0012] The central tube of the concentrated water end reverse osmosis membrane element is connected to the water inlet pipeline, and is used to return the water produced by the central tube of the concentrated water end reverse osmosis membrane element to the reverse osmosis membrane assembly for reprocessing;

[0013] The water inlet end of the reverse osmosis membrane assembly is provided with a water production pipeline, which is connected to the central tube of the reverse osmosis membrane element at the water inlet end for discharging the produced water.

[0014] As a further technical solution, there is at least one reverse osmosis membrane element at the water inlet end.

[0015] As a further technical solution, when the number of reverse osmosis membrane elements at the water inlet end is greater than one, the central tubes of the reverse osmosis membrane elements at the water inlet end are connected via a water production connecting pipe.

[0016] As a further technical solution, the number of the concentrated water end reverse osmosis membrane element is at least one.

[0017] As a further technical solution, when the number of the reverse osmosis membrane elements at the concentrate end is greater than one, the central tubes of the reverse osmosis membrane elements at the concentrate end are connected via a produced water connecting tube.

[0018] As a further technical solution, the central tube of the reverse osmosis membrane element at the water inlet end and the central tube of the reverse osmosis membrane element at the concentrate end are connected by a partitioned water production connecting pipe, which is a water production connecting pipe with a sealing plate partition in the middle.

[0019] As a further technical solution, the number of the reverse osmosis membrane elements is 4-7.

[0020] In a second aspect, the utility model provides a reverse osmosis device, comprising the reverse osmosis membrane assembly.

[0021] As a further technical solution, the number of the reverse osmosis membrane assembly is at least one.

[0022] As a further technical solution, when the number of reverse osmosis membrane modules is greater than one, the reverse osmosis membrane modules are connected in parallel.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] (1) The system equipment is simple and easy to operate;

[0025] (2) Improve the desalination rate of the system. Seawater can be filtered into fresh water only through the primary seawater reverse osmosis membrane, which can stabilize the quality of recycled water specified in the "Water Quality of Industrial Water for Urban Wastewater Recycling" (GB / T19923-2005), replace the secondary reverse osmosis or reduce the treatment capacity of the secondary reverse osmosis, thereby reducing the energy consumption per ton of water produced by the entire system;

[0026] (3) Reduce system energy consumption. By returning the produced water at the end, the salt content of the incoming water can be appropriately diluted, thereby reducing the energy consumption of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is the reverse osmosis membrane assembly provided in Example 1 of the utility model.

[0029] Icon: 1- membrane shell; 2- water inlet pipe; 3- concentrate pipe; 4- reverse osmosis membrane element at water inlet end; 5- reverse osmosis membrane element at concentrate end; 6- produced water pipe. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. The components of the embodiments of the present application described in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0032] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In a first aspect, the utility model provides a reverse osmosis membrane assembly, comprising a membrane shell 1 and a reverse osmosis membrane element arranged in series inside the membrane shell 1;

[0035] One end of the reverse osmosis membrane assembly is a water inlet end, provided with a water inlet pipe 2, and the other end is a concentrated water end, provided with a concentrated water pipe 3; the water to be treated flows from the water inlet pipe 2 into the reverse osmosis membrane assembly for treatment, and the concentrated water obtained after treatment is discharged from the concentrated water pipe 3;

[0036] The reverse osmosis membrane element close to the water inlet end is the water inlet end reverse osmosis membrane element 4; the reverse osmosis membrane element close to the concentrated water end is the concentrated water end reverse osmosis membrane element 5;

[0037] The central tube of the reverse osmosis membrane element 4 at the water inlet end and the central tube of the reverse osmosis membrane element 5 at the concentrated water end are separated so that the produced water in the central tubes cannot communicate with each other;

[0038] The central tube of the concentrated water end reverse osmosis membrane element 5 is connected to the water inlet pipe 2, and is used to return the water produced by the central tube of the concentrated water end reverse osmosis membrane element 5 to the reverse osmosis membrane assembly for reprocessing;

[0039] The water inlet end of the reverse osmosis membrane assembly is provided with a water production pipeline 6, which is connected to the central tube of the reverse osmosis membrane element 4 at the water inlet end for discharging the produced water.

[0040] The reverse osmosis membrane assembly provided by the utility model has the water produced by the reverse osmosis membrane element at the water inlet end as the final water production, and the water produced by the reverse osmosis membrane element at the concentrated water end is returned to the water inlet of the reverse osmosis membrane assembly to be mixed with the raw water. When used for seawater desalination, compared with conventional reverse osmosis membrane assemblies without isolation, the reverse osmosis membrane assembly significantly improves the system's desalination rate and reduces the system's energy consumption.

[0041] In some optional embodiments, the number of the reverse osmosis membrane element 4 at the water inlet end is at least one, for example, it can be, but is not limited to, 1, 2, 3, 4, etc.

[0042] In some optional embodiments, when the number of the reverse osmosis membrane elements 4 at the water inlet end is greater than one, the central tubes of the reverse osmosis membrane elements 4 at the water inlet end are connected via a water production connecting pipe.

[0043] It should be noted that the produced water connecting pipe is a hollow pipe used to connect the central tubes of adjacent reverse osmosis membrane elements, and the central tubes of the reverse osmosis membrane elements are connected through the produced water connecting pipe.

[0044] In some optional implementations, the number of the concentrated water end reverse osmosis membrane element 5 is at least one, for example, it can be, but is not limited to, 1, 2, 3, 4, etc.

[0045] In some optional embodiments, when the number of the concentrated water end reverse osmosis membrane elements 5 is greater than one, the central tubes of the concentrated water end reverse osmosis membrane elements 5 are connected via a produced water connecting pipe.

[0046] In some optional embodiments, the central tube of the reverse osmosis membrane element 4 at the water inlet end and the central tube of the reverse osmosis membrane element 5 at the concentrated water end are connected by a partitioned water production connecting pipe, which is a water production connecting pipe with a sealing plate partition in the middle. The function of the partitioned water production connecting pipe is to partition the water production of the membrane group to achieve water production at both ends of the membrane.

[0047] The central tube of the reverse osmosis membrane element 4 at the water inlet end and the central tube of the reverse osmosis membrane element 5 at the concentrated water end are separated by the water production connection pipe.

[0048] In some optional embodiments, the number of the reverse osmosis membrane elements is 4-7.

[0049] In a second aspect, the utility model provides a reverse osmosis device, comprising the reverse osmosis membrane assembly.

[0050] The reverse osmosis device has high desalination rate and low energy consumption.

[0051] It should be noted that the reverse osmosis device of the present invention is mainly composed of a mold frame, a pressure vessel, a reverse osmosis membrane assembly and an instrument valve. The structure of the reverse osmosis device is well known in the art and will not be described in detail here.

[0052] In some optional embodiments, the number of the reverse osmosis membrane assembly is at least one, for example, it can be, but is not limited to, 1, 2, 3, etc.

[0053] In some optional embodiments, when the number of reverse osmosis membrane modules is greater than one, the reverse osmosis membrane modules are connected in parallel.

[0054] The present invention is further described below by means of specific examples and comparative examples. However, it should be understood that these examples are only used for more detailed description and should not be construed as limiting the present invention in any form.

[0055] Example 1

[0056] A reverse osmosis membrane assembly, such as Figure 1 As shown, it includes a membrane shell 1 and a reverse osmosis membrane element arranged in series inside the membrane shell 1;

[0057] One end of the reverse osmosis membrane assembly is a water inlet end, provided with a water inlet pipe 2, and the other end is a concentrated water end, provided with a concentrated water pipe 3; the water to be treated flows from the water inlet pipe 2 into the reverse osmosis membrane assembly for treatment, and the concentrated water obtained after treatment is discharged from the concentrated water pipe 3;

[0058] The reverse osmosis membrane element close to the water inlet end is the water inlet end reverse osmosis membrane element 4, the number is 4, and the central tubes of the water inlet end reverse osmosis membrane element 4 are connected through the water production connecting pipe; the reverse osmosis membrane element close to the concentrated water end is the concentrated water end reverse osmosis membrane element 5, the number is 1;

[0059] The central tube of the reverse osmosis membrane element 4 at the water inlet end and the central tube of the reverse osmosis membrane element 5 at the concentrated water end are connected by a partitioned water production connecting pipe, which is a water production connecting pipe with a sealing plate partition in the middle, so that the produced water in the central tube is not intercommunication;

[0060] The central tube of the concentrated water end reverse osmosis membrane element 5 is connected to the water inlet pipe 2, and is used to return the water produced by the central tube of the concentrated water end reverse osmosis membrane element 5 to the reverse osmosis membrane assembly for reprocessing;

[0061] A produced water pipeline 6 is provided at the water inlet end of the reverse osmosis membrane assembly, and the produced water pipeline 6 is connected to the central tube of the reverse osmosis membrane element 4 at the water inlet end for discharging produced water.

[0062] Comparative Example 1

[0063] A reverse osmosis membrane assembly is different from Example 1 in that the central tube of the reverse osmosis membrane element 4 at the water inlet end and the central tube of the reverse osmosis membrane element 5 at the concentrated water end are connected by a water production connecting pipe to achieve water production at both ends of the central tube.

[0064] Test Example 1

[0065] The reverse osmosis membrane assemblies provided in Example 1 and the comparative example were used to treat seawater, and the quality of the influent seawater is shown in Table 1.

[0066] Table 1 Influent seawater quality

[0067]

[0068]

[0069] Set the water inlet to 6m 3 / h, the system recovery rate is 40%, and the system desalination rate is 98.7% using the reverse osmosis membrane assembly provided in Comparative Example 1. The water quality and water volume of the inlet water of each membrane in the reverse osmosis membrane assembly are shown in Table 2 below.

[0070] Table 2 Water quality and quantity of each membrane inlet

[0071]

[0072] The total chloride content of produced water is 257 mg / L, which is greater than the chloride content (<250 mg / L) stipulated in the "Water Quality for Industrial Water Use in Urban Wastewater Recycling" (GB / T19923-2005).

[0073] The reverse osmosis membrane assembly provided in Example 1 was used for treatment, and the water quality and quantity of the inlet water of each membrane are shown in Table 3. Compared with Example 1, the chloride of the produced water was reduced from 257 mg / L to 213 mg / L, the TDS of the produced water was reduced from 459 mg / L to 372 mg / L, and the system desalination rate was increased from 98.7% to 99%, with significant effects.

[0074] Table 3 Adjusted water quality and quantity of each membrane inlet

[0075]

[0076]

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A reverse osmosis membrane assembly, characterized in that: It comprises a membrane shell (1) and a reverse osmosis membrane element arranged in series inside the membrane shell (1); One end of the reverse osmosis membrane assembly is a water inlet end, provided with a water inlet pipe (2), and the other end is a concentrated water end, provided with a concentrated water pipe (3); the water to be treated flows from the water inlet pipe (2) into the reverse osmosis membrane assembly for treatment, and the concentrated water obtained after treatment is discharged from the concentrated water pipe (3); The reverse osmosis membrane element close to the water inlet end is the water inlet end reverse osmosis membrane element (4); the reverse osmosis membrane element close to the concentrated water end is the concentrated water end reverse osmosis membrane element (5); A partition is provided between the central tube of the reverse osmosis membrane element (4) at the water inlet end and the central tube of the reverse osmosis membrane element (5) at the concentrated water end; The central tube of the concentrated water end reverse osmosis membrane element (5) is connected to the water inlet pipeline (2) and is used to return the water produced by the central tube of the concentrated water end reverse osmosis membrane element (5) to the reverse osmosis membrane assembly for reprocessing; The water inlet end of the reverse osmosis membrane assembly is provided with a water production pipeline (6), which is connected to the central pipe of the reverse osmosis membrane element (4) at the water inlet end for discharging the produced water.

2. The reverse osmosis membrane assembly according to claim 1, characterized in that: The number of reverse osmosis membrane elements (4) at the water inlet end is at least one.

3. The reverse osmosis membrane assembly according to claim 2, characterized in that: When the number of the reverse osmosis membrane elements (4) at the water inlet end is greater than one, the central tubes of the reverse osmosis membrane elements (4) at the water inlet end are connected via a water production connecting pipe.

4. The reverse osmosis membrane assembly according to claim 1, characterized in that: The number of the concentrated water end reverse osmosis membrane element (5) is at least one.

5. The reverse osmosis membrane assembly according to claim 4, characterized in that: When the number of the concentrated water end reverse osmosis membrane elements (5) is greater than one, the central tubes of the concentrated water end reverse osmosis membrane elements (5) are connected via a water production connecting pipe.

6. The reverse osmosis membrane assembly according to claim 1, characterized in that: The central tube of the reverse osmosis membrane element (4) at the water inlet end and the central tube of the reverse osmosis membrane element (5) at the concentrated water end are connected via a partitioned water production connecting pipe, wherein the partitioned water production connecting pipe is a water production connecting pipe with a sealing plate partition in the middle.

7. The reverse osmosis membrane assembly according to claim 1, characterized in that: The number of the reverse osmosis membrane elements is 4-7.

8. A reverse osmosis device, characterized in that: The invention comprises the reverse osmosis membrane assembly according to any one of claims 1 to 7.

9. The reverse osmosis device according to claim 8, characterized in that: The number of the reverse osmosis membrane assembly is at least one.

10. The reverse osmosis device according to claim 9, characterized in that: When the number of reverse osmosis membrane modules is greater than one, the reverse osmosis membrane modules are connected in parallel.

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