A kind of EHBR membrane module with integrated aeration and oxygenation and preparation method thereof

Abstract

The present invention relates to the technical field of membrane components for water purification, and in particular to an EHBR membrane component integrated with aeration and oxygenation and a preparation method thereof, comprising: a membrane shell and a membrane unit, wherein the membrane shell is fixedly mounted at both ends of the membrane unit; the EHBR membrane is an EHBR membrane containing nanocarbonates, and the EHBR membrane is provided with a microporous region caused by erosion; the membrane unit is provided with adjacent aeration regions and oxygenation regions, and the aeration region is formed by the microporous region. The preparation method comprises immersing part of the membrane units of the uncorroded EHBR membrane component into a heated acid solution to form micropores. The present invention solves the problem that the EHBR membrane component in the prior art has a single function and cannot perform water aeration and oxygenation. The provided EHBR membrane component integrated with aeration and oxygenation has the advantages of relatively independent aeration and oxygenation, integrated water aeration and oxygenation, and no interference with the microbial ecology around the EHBR membrane.

Description

Technical Field

[0001] The invention relates to the technical field of membrane components for water purification, and in particular to an EHBR membrane component integrated with aeration and oxygenation and a preparation method thereof. Background Art

[0002] EHBR enhanced coupled biofilm reactor (academic name: MABR, membrane aerated biofilm reactor), the existing EHBR membrane products are hollow fiber or flat membrane structures.

[0003] Existing EHBR membrane products can only be used as oxygenated membrane carriers (bubbleless aeration (bubbles are not visible to the naked eye)), and can only function as microbial membrane carriers, but cannot aerate water bodies (bubbles are visible to the naked eye). In practical applications, it is necessary to lay aeration pipes or aeration membranes separately, which not only makes the pipeline connection complicated, but also increases the additional investment cost of the aeration function. In addition, the remaining oxygen filled into the EHBR membrane cannot be used, and a large amount of tail gas cannot be discharged, which ultimately affects the use effect of the EHBR membrane.

[0004] Compared with the one-piece EHBR membrane assembly in CN201910053980.4, which is a parallel mixture of EHBR membrane and microporous aeration membrane, the aeration of the aeration membrane will seriously interfere with the microbial ecology around the EHBR membrane, and it is impossible to form an anoxic zone around the EHBR membrane, which reduces the operational selectivity in practical applications. Moreover, the aeration bubbles can easily impact the biofilm generated on the EHBR membrane, causing the biofilm to be blown off, seriously affecting the efficacy of the product. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an EHBR membrane assembly with integrated aeration and oxygenation, which is used to solve the problems in the prior art that the EHBR membrane assembly has a single function and cannot aerate and oxygenate the water body, and that the parallel mixing of the EHBR membrane and the microporous aeration membrane will interfere with the microbial ecology around the EHBR membrane. At the same time, the present invention will also provide a method for preparing the EHBR membrane assembly with integrated aeration and oxygenation; the provided EHBR membrane assembly with integrated aeration and oxygenation has the advantages of relatively independent aeration and oxygenation, integrated aeration and oxygenation of the water body, and no interference with the microbial ecology around the EHBR membrane.

[0006] To achieve the above purposes and other related purposes,

[0007] In a first aspect of the present invention, there is provided an EHBR membrane assembly with integrated aeration and oxygenation, the EHBR membrane assembly with integrated aeration and oxygenation comprising: a membrane shell and a membrane unit, wherein the membrane shell is fixedly mounted at both ends of the membrane unit;

[0008] The membrane unit is composed of at least 20 EHBR membranes installed in parallel, wherein the EHBR membrane is an EHBR membrane containing nanocarbonate, and the EHBR membrane is provided with a microporous area caused by erosion;

[0009] The membrane unit is provided with an aeration area and an oxygenation area, wherein the aeration area is adjacent to the oxygenation area, the aeration area is formed by at least 20 microporous areas arranged in parallel, and the oxygenation area accounts for 20-80% of the membrane unit.

[0010] The oxygenation area accounts for 20% to 80% of the membrane unit. Within this range, both aeration and oxygenation functions can be well exerted.

[0011] The EHBR membrane is an EHBR membrane containing nano-carbonates. The addition of nano-carbonates can form microporous areas through erosion, and finally obtain an EHBR membrane with integrated aeration and oxygenation.

[0012] Microporous areas are set on the same membrane to achieve the aeration function, so that the EHBR membrane module can achieve two functions of aeration and oxygenation.

[0013] The aeration area is adjacent to the oxygenation area, and the aeration area and the oxygenation area are relatively independent. The aeration area does not affect the ecology of the bacterial community around the EHBR membrane. An anoxic zone can be formed around the EHBR membrane, while the aeration area can still supply water and discharge tail gas normally.

[0014] The aeration area is relatively independent from the oxygenation area. During the aeration process, the EHBR membrane biofilm will not be impacted, and the biofilm will not be blown off, which enhances the stability of the EHBR membrane assembly and extends the service life of the EHBR membrane assembly.

[0015] In one embodiment of the present invention, the membrane shell is fixedly mounted on both ends of the membrane unit by potting glue, which is more stable, enhances the stability of the EHBR membrane assembly, and prolongs the service life of the EHBR membrane assembly.

[0016] In one embodiment of the present invention, the air inlet end of the membrane shell is provided with an air inlet and a first connection port, the exhaust end of the membrane shell is provided with an exhaust port and a second connection port, and the first connection port and the second connection port are respectively used to connect the first connection port and the second connection port of another EHBR membrane assembly. By designing the connection port on the membrane shell, different EHBR membrane assemblies can be used in a continuous manner.

[0017] In one embodiment of the present invention, one end of the membrane shell is fixedly connected to the aeration area, and the other end of the membrane shell is fixedly connected to the oxygenation area.

[0018] In one embodiment of the present invention, both ends of the membrane shell are fixedly connected to the aeration area.

[0019] In one embodiment of the present invention, both ends of the membrane shell are fixedly connected to the oxygenation area.

[0020] The aeration area can be set at any position, and setting it at different positions can realize the two functions of aeration and oxygenation in one.

[0021] In one embodiment of the present invention, the nano-carbonate is nano-calcium carbonate or nano-magnesium carbonate. Nano-calcium carbonate or nano-magnesium carbonate is more likely to react with acid to form uniform and dense micropores.

[0022] The second aspect of the present invention provides a method for preparing the above-mentioned aeration and oxygenation integrated EHBR membrane module, comprising the following steps:

[0023] Step 1: Fix the membrane shells at both ends of the membrane unit to form an uncorroded EHBR membrane assembly, and prepare an acid solution with a pH value of 0.1 to 4.0;

[0024] Step 2: After heating the acid solution to 50-80°C, immerse part of the membrane units of the dry and uncorroded EHBR membrane assembly in the acid solution for 4-24 hours to form an aeration area, take out the EHBR membrane assembly and wash it with water, so as to obtain an EHBR membrane assembly with integrated aeration and oxygenation;

[0025] During the preparation of the aeration and oxygenation integrated EHBR membrane assembly, microporous areas are formed by immersion and corrosion in an acid solution. During the operation, it is easy to control the erosion of different positions of the membrane unit. The operation process is simple and convenient for industrial mass production.

[0026] Pore ​​expansion principle: Acid reacts with nanocarbonate (component of membrane).

[0027] The carbonate erosion reaction is eliminated, and finally aeration micropores are left on the membrane.

[0028] The pore size of the aeration membrane is adjusted by the concentration of the composite erosion pore-forming solution and the immersion time.

[0029] The position and proportion of the EHBR membrane and microporous aeration membrane assembled in a single membrane unit are achieved by adjusting the immersion position and proportion of the EHBR membrane.

[0030] In one embodiment of the present invention, the solute in the acid solution is at least one of hydrochloric acid, citric acid and / or acetic acid. Hydrochloric acid, citric acid and / or acetic acid have a better effect of etching and forming pores.

[0031] In one embodiment of the present invention, the membrane unit is immersed for 8 to 12 hours.

[0032] As described above, the aeration and oxygenation integrated EHBR membrane assembly and the preparation method thereof of the present invention have the following beneficial effects:

[0033] 1. Microporous areas are set on the same membrane to achieve the aeration function, so that the EHBR membrane module can achieve two functions of aeration and oxygenation.

[0034] 2. The aeration area is adjacent to the oxygenation area, and the aeration area and the oxygenation area are relatively independent. The aeration area does not affect the ecology of the bacterial community around the EHBR membrane. An anoxic zone can be formed around the EHBR membrane, while the aeration area can still supply water and discharge tail gas normally.

[0035] 3. The aeration area and the oxygenation area are relatively independent. During the aeration process, the EHBR membrane biofilm will not be impacted, and the biofilm will not be blown off, which enhances the stability of the EHBR membrane assembly and extends the service life of the EHBR membrane assembly.

[0036] 4. During the preparation of the EHBR membrane assembly with integrated aeration and oxygenation, microporous areas are formed by immersion and corrosion in an acid solution. During the operation, it is easy to control the erosion of different positions of the membrane unit. The operation process is simple and convenient for industrial mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Shown is a schematic diagram of the structure of the EHBR membrane assembly in Example 1 of the present invention.

[0038] Figure 2 Shown is a schematic diagram of the structure of the EHBR membrane module in Example 2 of the present invention.

[0039] Figure 3 It shows a schematic diagram of the structure of the EHBR membrane assembly in Example 3 of the present invention.

[0040] Figure 4 Shown is a schematic diagram of the corrosion of the EHBR membrane module in an embodiment of the present invention.

[0041] Figure 5 It is a schematic diagram showing the EHBR membrane after erosion in the EHBR membrane module in an embodiment of the present invention.

[0042] Component number description

[0043] 1-membrane shell, 11-air inlet, 12-first connection port, 13-emptying port, 14-second connection port; 2-membrane unit, 21-EHBR membrane, 22-aeration area, 23-oxygenation area, 3-glue filling area. DETAILED DESCRIPTION

[0044] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0045] See also Figures 1 to 5 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0046] Example 1

[0047] See also Figure 1 and Figure 4 The present invention provides an aeration and oxygenation integrated EHBR membrane assembly, the aeration and oxygenation integrated EHBR membrane assembly comprising: a membrane shell 1 and a membrane unit 2, the membrane shell 1 is fixedly installed at both ends of the membrane unit 2 by potting glue;

[0048] The membrane unit 2 is composed of at least 20 EHBR membranes 21 installed in parallel, wherein the EHBR membrane is an EHBR membrane containing nano-calcium carbonate, and the EHBR membrane 21 is provided with a microporous area caused by erosion;

[0049] The membrane unit 2 is provided with an aeration area 22 and an oxygenation area 23, wherein the aeration area 22 is adjacent to the oxygenation area 23, and the aeration area 22 is formed by at least 20 microporous areas arranged in parallel;

[0050] The air inlet end of the membrane shell 1 is provided with an air inlet port 11 and a first connecting port 12, and the air outlet end of the membrane shell 1 is provided with an air outlet port 13 and a second connecting port 14, wherein the first connecting port 12 and the second connecting port 14 are respectively used to connect to the first connecting port 12 and the second connecting port 14 of another EHBR membrane module;

[0051] One end of the membrane shell 1 is fixedly connected to the aeration area 22 , and the other end of the membrane shell 1 is fixedly connected to the oxygenation area 23 .

[0052] The method for preparing the above-mentioned aeration and oxygenation integrated EHBR membrane assembly comprises the following steps:

[0053] Step 1: Fix the membrane shell 1 at both ends of the membrane unit 2 to form an uncorroded EHBR membrane assembly, and prepare a hydrochloric acid aqueous solution with a pH value of 0.5;

[0054] Step 2: After heating the acid solution to 50-70° C., immerse the dry and uncorroded membrane unit 2 of the EHBR membrane assembly into the acid solution for 8 hours to form an aeration area 22, take out the EHBR membrane assembly and wash it with water to obtain an EHBR membrane assembly with integrated aeration and oxygenation.

[0055] Example 2

[0056] See also Figure 4 and Figure 2 The present invention provides an aeration and oxygenation integrated EHBR membrane assembly, the aeration and oxygenation integrated EHBR membrane assembly comprising: a membrane shell 1 and a membrane unit 2, the membrane shell 1 is fixedly installed at both ends of the membrane unit 2 by potting glue;

[0057] The membrane unit 2 is composed of at least 20 EHBR membranes 21 installed in parallel, wherein the EHBR membrane is an EHBR membrane containing nano-magnesium carbonate, and the EHBR membrane 21 is provided with a microporous area caused by erosion;

[0058] The membrane unit 2 is provided with an aeration area 22 and an oxygenation area 23, wherein the aeration area 22 is adjacent to the oxygenation area 23, and the aeration area 22 is formed by at least 20 microporous areas arranged in parallel;

[0059] The air inlet end of the membrane shell 1 is provided with an air inlet port 11 and a first connecting port 12, and the air outlet end of the membrane shell 1 is provided with an air outlet port 13 and a second connecting port 14, wherein the first connecting port 12 and the second connecting port 14 are respectively used to connect to the first connecting port 12 and the second connecting port 14 of another EHBR membrane module;

[0060] Both ends of the membrane shell 1 are fixedly connected to the aeration area 22 .

[0061] The method for preparing the above-mentioned aeration and oxygenation integrated EHBR membrane assembly comprises the following steps:

[0062] Step 1: Fix the membrane shell 1 at both ends of the membrane unit 2 to form an uncorroded EHBR membrane assembly, and prepare a citric acid aqueous solution with a pH value of 2.0;

[0063] Step 2: After heating the acid solution to 70-80°C, immerse the dry and uncorroded membrane unit 2 of the EHBR membrane assembly into the acid solution for 12 hours to form an aeration area 22, take out the EHBR membrane assembly and wash it with water to obtain an EHBR membrane assembly with integrated aeration and oxygenation.

[0064] Example 3

[0065] See also Figure 4 and Figure 3 The present invention provides an aeration and oxygenation integrated EHBR membrane assembly, the aeration and oxygenation integrated EHBR membrane assembly comprising: a membrane shell 1 and a membrane unit 2, the membrane shell 1 is fixedly installed at both ends of the membrane unit 2 by potting glue;

[0066] The membrane unit 2 is composed of at least 20 EHBR membranes 21 installed in parallel, wherein the EHBR membrane is an EHBR membrane containing nano-calcium carbonate, and the EHBR membrane 21 is provided with a microporous area caused by erosion;

[0067] The membrane unit 2 is provided with an aeration area 22 and an oxygenation area 23, wherein the aeration area 22 is adjacent to the oxygenation area 23, and the aeration area 22 is formed by at least 20 microporous areas arranged in parallel;

[0068] The air inlet end of the membrane shell 1 is provided with an air inlet port 11 and a first connecting port 12, and the air outlet end of the membrane shell 1 is provided with an air outlet port 13 and a second connecting port 14, wherein the first connecting port 12 and the second connecting port 14 are respectively used to connect to the first connecting port 12 and the second connecting port 14 of another EHBR membrane module;

[0069] Both ends of the membrane shell 1 are fixedly connected to the oxygenation area 23 .

[0070] The method for preparing the above-mentioned aeration and oxygenation integrated EHBR membrane assembly comprises the following steps:

[0071] Step 1: Fix the membrane shell 1 at both ends of the membrane unit 2 to form an uncorroded EHBR membrane assembly, and prepare an acetic acid aqueous solution with a pH value of 1.0;

[0072] Step 2: After heating the acid solution to 60-80° C., immerse the dry and uncorroded membrane unit 2 of the EHBR membrane assembly in the acid solution for 10 hours to form an aeration area 22, take out the EHBR membrane assembly and wash it with water to obtain an EHBR membrane assembly with integrated aeration and oxygenation.

[0073] In summary, the aeration and oxygenation integrated EHBR membrane assembly provided by the present invention has the advantages of relatively independent aeration and oxygenation, integrated aeration and oxygenation of water bodies, and no interference with the microbial ecology around the EHBR membrane. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0074] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An EHBR membrane module with integrated aeration and oxygenation, characterized in that: The aeration and oxygenation integrated EHBR membrane assembly comprises: a membrane shell (1) and a membrane unit (2), wherein the membrane shell (1) is fixedly mounted at both ends of the membrane unit (2); The membrane unit (2) is composed of at least 20 EHBR membranes (21) installed in parallel, the EHBR membrane is an EHBR membrane containing nanocarbonate, and the EHBR membrane (21) is provided with a microporous region caused by erosion; An aeration area (22) and an oxygenation area (23) are arranged on the membrane unit (2); the aeration area (22) is adjacent to the oxygenation area (23); and the aeration area (22) is formed by at least 20 microporous areas arranged in parallel.

2. The EHBR membrane module with integrated aeration and oxygenation according to claim 1, characterized in that: The membrane shell (1) is fixedly mounted on both ends of the membrane unit (2) by potting glue.

3. The EHBR membrane module with integrated aeration and oxygenation according to claim 1 or 2, characterized in that: The air inlet end of the membrane shell (1) is provided with an air inlet port (11) and a first connecting port (12), and the air discharge end of the membrane shell (1) is provided with an air discharge port (13) and a second connecting port (14), and the first connecting port (12) and the second connecting port (14) are respectively used to connect to the first connecting port (12) and the second connecting port (14) of another EHBR membrane module.

4. The EHBR membrane module with integrated aeration and oxygenation according to claim 1 or 2, characterized in that: One end of the membrane shell (1) is fixedly connected to the aeration area (22), and the other end of the membrane shell (1) is fixedly connected to the oxygenation area (23).

5. The EHBR membrane module with integrated aeration and oxygenation according to claim 1 or 2, characterized in that: Both ends of the membrane shell (1) are fixedly connected to the aeration area (22).

6. The EHBR membrane module with integrated aeration and oxygenation according to claim 1 or 2, characterized in that: Both ends of the membrane shell (1) are fixedly connected to the oxygenation area (23).

7. The EHBR membrane module with integrated aeration and oxygenation according to claim 1, characterized in that: The nano carbonate is nano calcium carbonate or nano magnesium carbonate.

8. A method for preparing the aeration and oxygenation integrated EHBR membrane module according to any one of claims 1 to 7, characterized in that: The steps include: Step 1: Fix the membrane shell (1) at both ends of the membrane unit (2) to form an uncorroded EHBR membrane assembly, and prepare an acid solution with a pH value of 0.1 to 4.0; Step 2: After heating the acid solution to 50-80° C., immerse a portion of the membrane units (2) of the dry, uncorroded EHBR membrane assembly in the acid solution for 4-24 hours to form an aeration area (22), take out the EHBR membrane assembly and wash it with water to obtain an EHBR membrane assembly with integrated aeration and oxygenation.

9. The method for preparing an EHBR membrane module with integrated aeration and oxygenation according to claim 8, characterized in that: The solute in the acid solution is at least one of hydrochloric acid, citric acid and / or acetic acid.

10. The method for preparing an EHBR membrane module with integrated aeration and oxygenation according to claim 8, characterized in that: The immersion time of the membrane unit (2) is 8 to 12 hours.

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