Low-energy-consumption high-salinity water treatment system and seawater desalination system

Abstract

The utility model provides a low-energy-consumption high-salinity water treatment system and a seawater desalination system, and relates to the technical field of water treatment. The utility model provides a low-energy-consumption high-salt water treatment system which comprises at least two sections of reverse osmosis membrane components, an inter-section pump is not arranged between every two adjacent sections of reverse osmosis membrane assemblies, and a water inlet of the next section of reverse osmosis membrane assembly is communicated with a concentrated water opening of the previous section of reverse osmosis membrane assembly, so that the concentrated water of the previous section is subjected to reverse osmosis treatment to obtain produced water and concentrated water of the next section; the permeation flux of the reverse osmosis membrane of the next section of reverse osmosis membrane assembly is greater than that of the reverse osmosis membrane of the previous section of reverse osmosis membrane assembly; and a water producing port of the reverse osmosis membrane component behind the first-section reverse osmosis membrane component is communicated with a water inlet of the first-section reverse osmosis membrane component. According to the treatment system, the combination of high and low permeation flux reverse osmosis membranes is utilized, a booster pump between two adjacent sections of reverse osmosis membrane assemblies is omitted, the investment cost and the operation cost of the system are reduced, and the utilization efficiency of the reverse osmosis membranes is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to water treatment technical field especially is related to a kind of low energy consumption high salt water treatment system and seawater desalination system. BACKGROUND

[0002] Reverse osmosis is a kind of reverse migration movement of permeation, is a kind of separation method under the pressure driving, with the selective interception of semi-permeable membrane, the solute and solvent in solution are separated. Reverse osmosis process has many advantages such as low energy consumption, simple process, stable operation, high quality of effluent water compared with traditional water treatment method. In high salt water (for example, seawater) treatment system, conventional reverse osmosis system recovery rate can only be 40%-50%, in order to improve the yield of water, need to increase two, three stage reverse osmosis mode to improve, but often due to the increase of system salt, two three stage membrane water production rate is not high, and need to increase interstage booster pump to improve the pressure of two three stage membrane, cost is higher, existing process flow chart as shown in Figure 4 In addition, after two three stage reverse osmosis, the quality of effluent water is poor, may not reach the reuse standard, need to increase equipment to handle.

[0003] Therefore, the utility model is proposed. UTILITY MODEL CONTENT

[0004] The first purpose of the utility model is to provide a kind of low energy consumption high salt water treatment system to solve the above technical problems.

[0005] The second purpose of the utility model is to provide a kind of seawater desalination system.

[0006] In order to realize the above purpose, the following technical scheme is used:

[0007] First, the utility model provides a kind of low energy consumption high salt water treatment system, including at least 2 stage reverse osmosis membrane components;

[0008] Adjacent two stage reverse osmosis membrane components are not provided with interstage pump, the water inlet of next stage reverse osmosis membrane component is communicated with the concentrated water outlet of previous stage reverse osmosis membrane component, for making the concentrated water of previous stage to obtain the water production and concentrated water of next stage after reverse osmosis treatment;The permeation flux of the reverse osmosis membrane of next stage reverse osmosis membrane component is greater than the permeation flux of the reverse osmosis membrane of previous stage reverse osmosis membrane component;

[0009] The water outlet of reverse osmosis membrane component after first stage reverse osmosis membrane component is communicated with the water inlet of first stage reverse osmosis membrane component.

[0010] As further scheme, each stage reverse osmosis membrane component independently includes at least one reverse osmosis membrane.

[0011] As a further solution, the next-stage reverse osmosis membrane assembly selects a reverse osmosis membrane matched with the pressure of the concentrated water of the previous-stage reverse osmosis membrane assembly, so that the next-stage reverse osmosis membrane assembly can work normally.

[0012] As a further solution, the low-energy-consumption high-salinity water treatment system comprises two reverse osmosis membrane assemblies, i.e., a first-stage reverse osmosis membrane assembly and a second-stage reverse osmosis membrane assembly.

[0013] The water inlet of the second-stage reverse osmosis membrane assembly is communicated with the concentrated water outlet of the first-stage reverse osmosis membrane assembly, and the water outlet of the second-stage reverse osmosis membrane assembly is communicated with the water inlet of the first-stage reverse osmosis membrane assembly.

[0014] As a further solution, the low-energy-consumption high-salinity water treatment system comprises three reverse osmosis membrane assemblies, i.e., a first-stage reverse osmosis membrane assembly, a second-stage reverse osmosis membrane assembly and a third-stage reverse osmosis membrane assembly.

[0015] The water inlet of the second-stage reverse osmosis membrane assembly is communicated with the concentrated water outlet of the first-stage reverse osmosis membrane assembly, and the water outlet of the second-stage reverse osmosis membrane assembly is communicated with the water inlet of the first-stage reverse osmosis membrane assembly.

[0016] The water inlet of the third-stage reverse osmosis membrane assembly is communicated with the concentrated water outlet of the second-stage reverse osmosis membrane assembly, and the water outlet of the third-stage reverse osmosis membrane assembly is communicated with the water inlet of the first-stage reverse osmosis membrane assembly.

[0017] As a further solution, the low-energy-consumption high-salinity water treatment system further comprises a high-pressure pump.

[0018] The high-pressure pump is communicated with the water inlet of the first-stage reverse osmosis membrane assembly, and is used to deliver the water to be treated to the first-stage reverse osmosis membrane assembly for reverse osmosis treatment.

[0019] As a further solution, the water to be treated comprises seawater.

[0020] In a second aspect, the utility model provides a kind of seawater desalination system, including the low-energy-consumption high-salinity water treatment system.

[0021] As a further solution, the low-energy-consumption high-salinity water treatment system further comprises a filter device.

[0022] The filter device is arranged before the low-energy-consumption high-salinity water treatment system, and is used to filter seawater, and the filtered seawater flows into the low-energy-consumption high-salinity water treatment system for reverse osmosis treatment.

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

[0024] The low-energy-consumption high-salinity water treatment system provided by the utility model cancels the booster pump between the adjacent two reverse osmosis membrane assemblies by using the combination of high-low permeation flux reverse osmosis membranes, reduces the investment cost and operating cost of the system, improves the utilization efficiency of the reverse osmosis membrane, and improves the water quality by flowing the produced water back to the first-stage reverse osmosis membrane assembly. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a low-energy-consumption, high-salinity water treatment system provided in Embodiment 1 of this utility model;

[0027] Figure 2 This is a low-energy-consumption, high-salinity water treatment system provided in Embodiment 2 of this utility model;

[0028] Figure 3 This is the seawater desalination system provided in Embodiment 3 of the present invention;

[0029] Figure 4 For comparative example 1 or comparative example 2, a low-energy high-salinity water treatment system;

[0030] Figure 5 This is a low-energy, high-salinity water treatment system as shown in Comparative Example 3.

[0031] Icons: 1-First stage reverse osmosis membrane module; 2-Second stage reverse osmosis membrane module; 3-Third stage reverse osmosis membrane module; 4-High pressure pump; 5-Filtration device. Detailed Implementation

[0032] The embodiments and examples of this utility model will be described in detail below. However, those skilled in the art will understand that the following embodiments and examples are only for illustrating this utility model and should not be considered as limiting the scope of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Unless otherwise specified, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0033] In one aspect, this utility model provides a low-energy-consumption high-saltwater treatment system, including at least two reverse osmosis membrane modules;

[0034] No inter-stage pump is arranged between two adjacent reverse osmosis membrane assemblies, the water inlet of the next reverse osmosis membrane assembly is communicated with the concentrated water outlet of the previous reverse osmosis membrane assembly, so that the concentrated water of the previous stage is treated by reverse osmosis to obtain the product water and the concentrated water of the next stage; the permeation flux of the reverse osmosis membrane of the next reverse osmosis membrane assembly is greater than the permeation flux of the reverse osmosis membrane of the previous reverse osmosis membrane assembly;

[0035] The product water outlet of the reverse osmosis membrane assembly after the first reverse osmosis membrane assembly 1 is communicated with the water inlet of the first reverse osmosis membrane assembly 1.

[0036] The low-energy-consumption high-salinity water treatment system provided by the utility model utilizes the combination of high and low permeation flux reverse osmosis membranes, cancels the booster pump between two adjacent reverse osmosis membrane assemblies, reduces the investment cost and operation cost of the system, and improves the utilization efficiency of the reverse osmosis membrane; the product water is returned to the first reverse osmosis membrane assembly to improve the product water quality.

[0037] In some optional embodiments, each of the reverse osmosis membrane assemblies independently comprises at least one reverse osmosis membrane. For example, the reverse osmosis assembly is composed of a membrane shell and a reverse osmosis membrane arranged in series inside the membrane shell, and a plurality of reverse osmosis assemblies are connected in parallel to form a larger reverse osmosis membrane assembly.

[0038] The plurality of reverse osmosis membrane assemblies are connected in parallel to improve the raw water treatment capacity.

[0039] In some optional embodiments, the reverse osmosis membrane in the next reverse osmosis membrane assembly is selected to match the concentrated water pressure of the previous stage, so that the next reverse osmosis membrane assembly can work normally.

[0040] The treatment effect of the reverse osmosis membrane is affected by excessively high or low water inlet pressure, therefore, for the reverse osmosis membrane assemblies other than the first stage, the reverse osmosis membrane needs to be selected to match the concentrated water pressure of the previous stage.

[0041] In some optional embodiments, the low-energy-consumption high-salinity water treatment system comprises two reverse osmosis membrane assemblies, namely, a first reverse osmosis membrane assembly 1 and a second reverse osmosis membrane assembly 2.

[0042] The water inlet of the second reverse osmosis membrane assembly 2 is communicated with the concentrated water outlet of the first reverse osmosis membrane assembly 1, and the product water outlet is communicated with the water inlet of the first reverse osmosis membrane assembly 1.

[0043] In some optional embodiments, the low-energy-consumption high-salinity water treatment system comprises three reverse osmosis membrane assemblies, namely, a first reverse osmosis membrane assembly 1, a second reverse osmosis membrane assembly 2 and a third reverse osmosis membrane assembly 3.

[0044] The water inlet of the second-stage reverse osmosis membrane assembly 2 is communicated with the concentrated water outlet of the first-stage reverse osmosis membrane assembly 1, and the water outlet is communicated with the water inlet of the first-stage reverse osmosis membrane assembly 1.

[0045] The water inlet of the third-stage reverse osmosis membrane assembly 3 is communicated with the concentrated water outlet of the second-stage reverse osmosis membrane assembly 2, and the water outlet is communicated with the water inlet of the first-stage reverse osmosis membrane assembly 1.

[0046] In some optional embodiments, a high-pressure pump 4 is further included.

[0047] The high-pressure pump 4 is communicated with the water inlet of the first-stage reverse osmosis membrane assembly 1, and is used for delivering the water to be treated to the first-stage reverse osmosis membrane assembly 1 for reverse osmosis treatment.

[0048] In some optional embodiments, the water to be treated includes but is not limited to seawater, and can also be other high-salinity wastewater, etc.

[0049] In a second aspect, the utility model provides a seawater desalination system, including low energy consumption high salt water treatment system.

[0050] The seawater desalination system has simple structure and low cost.

[0051] In some optional embodiments, a filtering device 5 is further included.

[0052] The filtering device 5 is arranged before the low energy consumption high salt water treatment system, and is used for filtering the seawater, and the filtered seawater flows into the low energy consumption high salt water treatment system for reverse osmosis treatment.

[0053] The utility model will be further explained below through specific embodiments, but it should be understood that these embodiments are only for more detailed explanation, and should not be understood as limiting the utility model in any form.

[0054] In the following embodiments, under the test conditions of 32000mg / L of sodium chloride solution concentration, pH = 8, test temperature 25 DEG C, operating pressure 5.5MPa, and recovery rate 8%, the performance specifications of RO1-RO6 reverse osmosis membranes are shown in Table 1.

[0055] Table 1

[0056] Membrane model Water production (m 3 / d) Desalination rate (%) RO1 (conventional) 28 99.8 RO2 34 99.8 RO3 41.6 99.7 RO4 42 99 RO5 45 98 RO6 50 97

[0057] Embodiment 1

[0058] A low energy consumption high salt water treatment system, as shown in the figure, includes a high-pressure pump, a first-stage reverse osmosis membrane assembly 1 and a second-stage reverse osmosis membrane assembly 2. Figure 1

[0059] ​The high-pressure pump 4 is communicated with the water inlet of the first-stage reverse osmosis membrane assembly 1, and is used for delivering water to be treated to the first-stage reverse osmosis membrane assembly 1 for reverse osmosis treatment.

[0060] The water inlet of the second-stage reverse osmosis membrane assembly 2 is communicated with the concentrated water outlet of the first-stage reverse osmosis membrane assembly 1, and the water outlet is communicated with the water inlet of the first-stage reverse osmosis membrane assembly 1.

[0061] The first-stage reverse osmosis membrane assembly 1 is connected in parallel with two membrane shells, and six reverse osmosis membranes RO1 are connected in series in each membrane shell.

[0062] Embodiment 2

[0063] A low-energy-consumption high-salinity water treatment system, as shown in the figure, comprises a high-pressure pump, a first-stage reverse osmosis membrane assembly 1, a second-stage reverse osmosis membrane assembly 2 and a third-stage reverse osmosis membrane assembly 3. Figure 2

[0064] The high-pressure pump 4 is communicated with the water inlet of the first-stage reverse osmosis membrane assembly 1, and is used for delivering water to be treated to the first-stage reverse osmosis membrane assembly 1 for reverse osmosis treatment.

[0065] The water inlet of the second-stage reverse osmosis membrane assembly 2 is communicated with the concentrated water outlet of the first-stage reverse osmosis membrane assembly 1, and the water outlet is communicated with the water inlet of the first-stage reverse osmosis membrane assembly 1.

[0066] The water inlet of the third-stage reverse osmosis membrane assembly 3 is communicated with the concentrated water outlet of the second-stage reverse osmosis membrane assembly 2, and the water outlet is communicated with the water inlet of the first-stage reverse osmosis membrane assembly 1.

[0067] The first-stage reverse osmosis membrane assembly 1 is connected in parallel with four membrane shells, and six RO1 membranes are connected in series in each membrane shell.

[0068] Comparative Example 1

[0069] A low-energy-consumption high-salinity water treatment system, as shown in the figure, comprises a high-pressure pump, a first-stage reverse osmosis membrane assembly 1, a stage pump and a second-stage reverse osmosis membrane assembly 2. Figure 4

[0070] The high-pressure pump 4 is communicated with the water inlet of the first-stage reverse osmosis membrane assembly 1, and is used for delivering water to be treated to the first-stage reverse osmosis membrane assembly 1 for reverse osmosis treatment.

[0071] ​​The inter-stage pump is arranged between the two adjacent reverse osmosis membrane assemblies, the water inlet of the second reverse osmosis membrane assembly 2 is communicated with the concentrated water outlet of the first reverse osmosis membrane assembly 1 through the inter-stage pump, and the water outlet is combined with the water outlet of the first reverse osmosis membrane assembly 1.

[0072] The first reverse osmosis membrane assembly 1 is connected in parallel with two membrane shells, six reverse osmosis membranes RO1 are arranged in series in each membrane shell, and the second reverse osmosis membrane assembly 2 is one membrane shell, and six reverse osmosis membranes RO1 are arranged in series in the membrane shell.

[0073] Comparative Example 2

[0074] A low-energy-consumption high-salinity water treatment system, as shown in Figure 4 The high-pressure pump 4 is communicated with the water inlet of the first reverse osmosis membrane assembly 1, and is used for delivering the water to be treated to the first reverse osmosis membrane assembly 1 for reverse osmosis treatment.

[0075] The high-pressure pump 4 is communicated with the water inlet of the first reverse osmosis membrane assembly 1, and is used for delivering the water to be treated to the first reverse osmosis membrane assembly 1 for reverse osmosis treatment.

[0076] The inter-stage pump is arranged between the two adjacent reverse osmosis membrane assemblies, the water inlet of the second reverse osmosis membrane assembly 2 is communicated with the concentrated water outlet of the first reverse osmosis membrane assembly 1 through the inter-stage pump, and the water outlet is combined with the water outlet of the first reverse osmosis membrane assembly 1.

[0077] The first reverse osmosis membrane assembly 1 is connected in parallel with two membrane shells, six reverse osmosis membranes RO1 are arranged in series in each membrane shell, and the second reverse osmosis membrane assembly 2 is one membrane shell, and six reverse osmosis membranes RO1 are arranged in series in the membrane shell.

[0078] Comparative Example 3

[0079] A low-energy-consumption high-salinity water treatment system, as shown in Figure 5 The high-pressure pump 4 is communicated with the water inlet of the first reverse osmosis membrane assembly 1, and is used for delivering the water to be treated to the first reverse osmosis membrane assembly 1 for reverse osmosis treatment.

[0080] The high-pressure pump 4 is communicated with the water inlet of the first reverse osmosis membrane assembly 1, and is used for delivering the water to be treated to the first reverse osmosis membrane assembly 1 for reverse osmosis treatment.

[0081] The inter-stage pump is arranged between the two adjacent reverse osmosis membrane assemblies, the water inlet of the second reverse osmosis membrane assembly 2 is communicated with the concentrated water outlet of the first reverse osmosis membrane assembly 1 through the inter-stage pump, and the water outlet is combined with the water outlet of the first reverse osmosis membrane assembly 1.

[0082] The first reverse osmosis membrane assembly 1 is connected in parallel with two membrane shells, six reverse osmosis membranes RO1 are arranged in series in each membrane shell, and the second reverse osmosis membrane assembly 2 is one membrane shell, and six reverse osmosis membranes RO1 are arranged in series in the membrane shell.

[0083] Example 3

[0084] A sea water desalination system, such as Figure 3 is shown, comprising a filter device 5 and the low energy consumption high salinity water treatment system provided in embodiment 1.

[0085] The filter device 5 is arranged before the low energy consumption high salinity water treatment system for filtering the sea water, and the filtered sea water flows into the low energy consumption high salinity water treatment system for reverse osmosis treatment.

[0086] Test example 1

[0087] The salinity of the influent 30000, 60% recovery rate, the influent 12m 3 / h, and the low energy consumption high salinity water treatment system of embodiment 1, comparative examples 1-3 is selected for treatment. The results are shown in Table 2.

[0088] Table 2

[0089]

[0090] As can be seen from Table 2, the conventional configuration operating pressure of embodiment 1 can be reduced by 11 bar at most, and the booster pump can not be configured, and the energy consumption can be reduced by about 12%.

[0091] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A low energy high salinity water treatment system, characterized by, The low-energy high-salinity water treatment system comprises at least two reverse osmosis membrane assemblies. No inter-stage pump is arranged between the two adjacent reverse osmosis membrane assemblies, the water inlet of the next reverse osmosis membrane assembly is communicated with the concentrated water outlet of the previous reverse osmosis membrane assembly, so that the concentrated water of the previous stage is subjected to reverse osmosis treatment to obtain the product water and concentrated water of the next stage; the permeation flux of the reverse osmosis membrane of the next reverse osmosis membrane assembly is greater than that of the reverse osmosis membrane of the previous reverse osmosis membrane assembly. The product water outlet of the reverse osmosis membrane assembly after the first reverse osmosis membrane assembly (1) is communicated with the water inlet of the first reverse osmosis membrane assembly (1).

2. The low energy high salinity water treatment system of claim 1, wherein, Each of the reverse osmosis membrane assemblies independently comprises at least one reverse osmosis membrane.

3. The low energy high salinity water treatment system of claim 1, wherein, The reverse osmosis membrane of the next reverse osmosis membrane assembly is selected to match the pressure of the concentrated water of the previous stage, so that the next reverse osmosis membrane assembly can work normally.

4. The low energy high salinity water treatment system of claim 1, wherein, The low-energy high-salinity water treatment system comprises two reverse osmosis membrane assemblies, namely a first reverse osmosis membrane assembly (1) and a second reverse osmosis membrane assembly (2). The water inlet of the second reverse osmosis membrane assembly (2) is communicated with the concentrated water outlet of the first reverse osmosis membrane assembly (1), and the product water outlet is communicated with the water inlet of the first reverse osmosis membrane assembly (1).

5. The low energy high salinity water treatment system of claim 1, wherein, The low-energy high-salinity water treatment system comprises three reverse osmosis membrane assemblies, namely a first reverse osmosis membrane assembly (1), a second reverse osmosis membrane assembly (2) and a third reverse osmosis membrane assembly (3). The water inlet of the second reverse osmosis membrane assembly (2) is communicated with the concentrated water outlet of the first reverse osmosis membrane assembly (1), and the product water outlet is communicated with the water inlet of the first reverse osmosis membrane assembly (1). The water inlet of the third reverse osmosis membrane assembly (3) is communicated with the concentrated water outlet of the second reverse osmosis membrane assembly (2), and the product water outlet is communicated with the water inlet of the first reverse osmosis membrane assembly (1).

6. The low energy high salinity water treatment system of claim 1, wherein, The low-energy high-salinity water treatment system further comprises a high-pressure pump (4). The high-pressure pump (4) is communicated with the water inlet of the first reverse osmosis membrane assembly (1) to deliver the water to be treated to the first reverse osmosis membrane assembly (1) for reverse osmosis treatment.

7. The low energy high salinity water treatment system of claim 6, wherein, The water to be treated comprises seawater.

8. A sea water desalination system characterized by, The low-energy high-salinity water treatment system comprises the low-energy high-salinity water treatment system according to any one of claims 1-7.

9. The system for desalination of seawater according to claim 8, characterized in that, The low-energy high-salinity water treatment system further comprises a filtering device (5). The filtering device (5) is arranged before the low-energy high-salinity water treatment system to filter the seawater, and the filtered seawater flows into the low-energy high-salinity water treatment system for reverse osmosis treatment.

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