Gradient porosity aeration membrane structure

Abstract

The utility model discloses a gradient porosity aeration membrane structure and relates to the field of sewage treatment aeration devices. The micro-porous membrane comprises a micro-porous membrane layer, a supporting framework layer and a substrate layer which are stacked in sequence, the microporous membrane layer is divided into a high-porosity area, a gradient transition area and a uniform microporous area from outside to inside in the water flow passing direction, and continuous porosity gradient changes are formed among all the areas. The supporting framework layer is composed of parallel wave-shaped rib plates, the wave crests of the rib plates are bonded with the microporous membrane layer, and gas channels are formed in the wave troughs of the rib plates. According to the aeration membrane, the continuous porosity gradient change is set on the microporous membrane layer, so that the diffusion and distribution conditions of gas in the aeration membrane are effectively improved, bubbles entering sewage are more uniform, the aeration uniformity is greatly improved, and the sewage treatment effect is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of sewage treatment aeration device, concretely relates to a gradient porosity aeration membrane structure, aims at solving many problems existing in the traditional aeration membrane in the sewage treatment process, improves the aeration efficiency and the service life of aeration membrane. BACKGROUND

[0002] In the aeration link of sewage treatment, the performance of aeration membrane plays a key role in aeration effect. The traditional aeration membrane has exposed a series of problems in the actual application process.

[0003] On the one hand, the traditional aeration membrane generally exists the situation of uneven pore distribution. This leads to the problem of big difference in bubble size in the aeration process when gas passes through the aeration membrane in different parts. This uneven aeration effect makes the distribution of dissolved oxygen in sewage uneven, affects the degradation efficiency of microorganisms to pollutants and reduces the overall effect of sewage treatment.

[0004] On the other hand, the problem of local blockage is more prominent. The aeration membrane with uniform pore structure adopted in the prior art, although the structure is relatively simple, but in the long-term use process, the gas inlet end is easy to form pollution blockage due to bearing larger gas pressure and impurity impact. Once blockage occurs, it will not only affect the uniformity of aeration, but also lead to a significant decrease in aeration efficiency and increase in energy consumption. Moreover, the multi-layer structure increases the transmission resistance of gas in the membrane, making it more difficult for gas to pass through the aeration membrane, which also affects the aeration efficiency.

[0005] In summary, how to realize reasonable porosity distribution under the premise of ensuring the structural strength of aeration membrane to improve aeration uniformity, reduce blockage and reduce gas resistance has become a difficult problem to be solved in the current aeration membrane technology field of sewage treatment. SUMMARY

[0006] The utility model discloses a gradient porosity aeration membrane structure, through the innovative structure design and material selection, solve the uneven pore distribution, local blockage and big gas resistance of traditional aeration membrane and so on, improve the aeration efficiency and the service life of aeration membrane in the sewage treatment process, reduce the sewage treatment cost.

[0007] To solve the above technical problems, the utility model adopts the following technical scheme: a gradient porosity aeration membrane structure, containing the microporous membrane layer, the support skeleton layer and the substrate layer that stack in turn, the microporous membrane layer is divided into high porosity area, gradient transition area and uniform microporous area from outside to inside along the water flow direction, and the continuous porosity gradient change is formed between each area.

[0008] Preferably, the support skeleton layer is composed of parallel wave-shaped ribs, the wave crests of which are bonded to the microporous membrane layer, and the wave troughs of which form gas channels.

[0009] Preferably, the wavelength of the wave-shaped ribs gradually increases along the gas flow direction.

[0010] Preferably, the base layer is provided with protruding positioning columns distributed at equal intervals, which form mechanical riveting with the microporous membrane layer and the support skeleton layer.

[0011] Preferably, the aeration membrane structure further comprises a ring-shaped sealing edge, which covers the periphery of the structure and has a metal reinforcing rib embedded inside.

[0012] Preferably, the sealing edge is provided with symmetrically distributed quick connector structures, which comprise dovetail joints and matching grooves.

[0013] Preferably, the surface of the microporous membrane layer is covered with a hydrophobic coating, which is gradually thinned in the gradient transition zone.

[0014] Compared with the prior art, the aeration membrane structure has the following beneficial effects:

[0015] By setting a continuous porosity gradient on the microporous membrane layer, the diffusion and distribution of gas in the aeration membrane are effectively improved, the bubbles entering the sewage are more uniform, the uniformity of aeration is greatly improved, and the sewage treatment effect is improved.

[0016] The wave-shaped rib structure of the support skeleton layer not only provides reliable support, but also helps to reduce gas resistance and improve the efficiency of gas passing through the aeration membrane due to its unique gas channel design and the characteristic of gradually increasing wavelength along the gas flow direction.

[0017] The mechanical riveting realized by the protruding positioning columns of the base layer enhances the connection stability between the three layers of structure and prolongs the service life of the aeration membrane.

[0018] The ring-shaped sealing edge and the metal reinforcing rib inside it effectively prevent gas leakage and improve aeration efficiency. At the same time, the quick connector structure on the sealing edge realizes modular assembly, which facilitates the installation, disassembly and maintenance of the equipment.

[0019] The hydrophobic coating on the surface of the microporous membrane layer and its gradual thinning in the gradient transition zone effectively prevent the clogging of the microporous membrane layer by water in the sewage and ensure the long-term stable operation of the aeration membrane. BRIEF DESCRIPTION OF DRAWINGS

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Fig. 1 This is a schematic diagram of the overall structure of a gradient porosity aeration membrane structure according to the present invention.

[0022] Fig. 2 This is a schematic diagram of the microporous membrane structure of a gradient porosity aeration membrane structure according to the present invention.

[0023] In the figure: 1. Microporous membrane layer; 11. High porosity region; 12. Gradient transition region; 13. Uniform microporous region; 2. Support skeleton layer; 21. Corrugated rib; 3. Base layer; 31. Positioning post; 4. Sealing edge; 411. Dovetail tenon; 412. Matching groove. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example: Figs. 1-2 As shown, this utility model provides a gradient porosity aeration membrane structure, comprising a microporous membrane layer 1, a supporting skeleton layer 2, and a base layer 3 stacked sequentially. The microporous membrane layer 1, along the water flow direction, is divided from the outside to the inside into a high-porosity region 11, a gradient transition region 12, and a uniform microporous region 13, forming a continuous porosity gradient between each region. The supporting skeleton layer 2 is composed of mutually parallel corrugated ribs 21, with the rib crests bonded to the microporous membrane layer 1 and the troughs forming gas channels. The wavelength of the corrugated ribs 21 gradually increases along the airflow direction. The base layer 3 is provided with evenly spaced protruding positioning posts 31, which penetrate the supporting skeleton layer 2 and form a mechanical connection with the microporous membrane layer 1. It also includes an annular sealing edge 4, which covers the perimeter of the structure and has embedded metal reinforcing ribs. The sealing edge 4 is provided with symmetrically distributed quick-connect structures, which include dovetail tenons 411 and matching grooves 412. The surface of the microporous membrane layer 1 is covered with a hydrophobic coating, which is distributed in a gradually thinning manner in the gradient transition region 12.

[0026] The gradient porosity aeration membrane structure of the present application will be described in detail below in connection with specific materials and processes.

[0027] Material selection:

[0028] The microporous membrane layer 1 is made of thermoplastic polyurethane elastomer rubber (TPU) material by injection molding. The TPU material has good flexibility, wear resistance and chemical corrosion resistance, which can meet the use requirements of the aeration membrane in the sewage treatment environment. Through specific injection molding process and mold design, the porosity gradually changes from a higher value to a lower value along the airflow direction, for example, from 30% to 5%, thereby forming a continuous porosity gradient change of the high porosity area 11, the gradient transition area 12 and the uniform microporous area 13.

[0029] The support framework layer 2 is made of polypropylene (PP) material. The PP material has the advantages of light weight, high strength and good chemical stability. It is processed into a wave-shaped rib plate 21 which is parallel to each other, and the rib plate height is controlled within the range of 3-8mm, which can provide sufficient support strength for the microporous membrane layer 1 and ensure that the trough forms a suitable gas passage.

[0030] The base layer 3 is made of ethylene propylene diene rubber (EPDM) plate with a thickness of 2-5mm. The EPDM rubber has excellent weather resistance, ozone resistance and water resistance, which can provide stable basic support for the entire aeration membrane structure. The raised positioning columns 31 are arranged at equal intervals on the EPDM rubber plate to realize mechanical riveting with the support framework layer 2 and the microporous membrane layer 1.

[0031] Manufacturing process:

[0032] Manufacturing of the microporous membrane layer 1: First, an injection mold with a temperature gradient is made according to the design requirements. During the injection molding process, the temperature of different parts of the mold is accurately controlled, so that the TPU material forms different crystal structures when it cools and solidifies in the mold, thereby realizing the continuous change of porosity. For example, a higher temperature is set at the mold part corresponding to the gas inlet end, so that the material crystallization speed is slower, forming the high porosity area 11; along the airflow direction, the mold temperature gradually decreases, the material crystallization speed increases, and the porosity gradually decreases, forming the gradient transition area 12 and the uniform microporous area 13.

[0033] Manufacturing of the support framework layer 2: The PP material is processed into a wave-shaped rib plate 21 by extrusion molding process. In the extrusion process, the parameters of the extruder and the mold structure are adjusted to control the wavelength, height and spacing of the rib plate, etc., to ensure that the rib plate peak can be well bonded with the microporous membrane layer 1, the trough forms a uniform gas passage, and the wavelength of the rib plate gradually increases along the airflow direction.

[0034] Manufacture of the base layer 3: EPDM rubber is made into a plate of desired thickness through a moulding process, and raised positioning columns 31 are punched out on the plate according to design requirements.

[0035] Assembly process:

[0036] The wave-shaped rib plate 21 of the manufactured support framework layer 2 is coated with special adhesive at the wave crests, and then bonded with the microporous membrane layer 1, ensuring firm connection between the two.

[0037] The raised positioning columns 31 of the base layer 3 are passed through the corresponding positions of the support framework layer 2, and mechanically riveted with the microporous membrane layer 1, completing preliminary assembly of the three-layer structure.

[0038] An annular sealing edge 4 is installed around the entire structure, and metal reinforcing ribs are embedded inside the sealing edge 4 in advance, and then the sealing edge 4 is fixed on the structure through hot pressing or gluing, etc., to ensure sealing effect.

[0039] Symmetrically distributed quick connector structures are installed on the sealing edge 4, with dovetail joints 411 and matching grooves 412 respectively installed at corresponding positions of the sealing edge 4, completing assembly of the entire aeration membrane structure.

[0040] Hydrophobic coating: a hydrophobic coating is applied on the surface of the microporous membrane layer 1 using a spraying process. During the spraying process, by controlling the moving speed of the spray gun, spraying pressure and coating flow rate and other parameters, the hydrophobic coating is formed in a gradually thinning distribution in the gradient transition zone 12. Specifically, the spraying amount of the coating is appropriately increased in the high-porosity zone 11, so that the coating is relatively thick, to better prevent water from entering; as moving towards the gradient transition zone 12, the spraying amount of the coating is gradually reduced, so that the thickness of the coating gradually thins, to ensure that the gas diffusion performance is not too affected; in the uniform microporous zone 13, the thickness of the coating is kept within a suitable range that can prevent water from adhering and also not affect the passage of gas.

[0041] Through the above specific embodiments, the gradient porosity aeration membrane structure manufactured can effectively achieve the expected technical effects, play a good role in the aeration link of wastewater treatment, improve the aeration efficiency and service life of the aeration membrane, and reduce the cost of wastewater treatment.

[0042] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A gradient porosity aerated membrane structure, characterized by: The application relates to a composite membrane structure, which comprises a microporous membrane layer (1), a support skeleton layer (2) and a base layer (3) which are sequentially stacked; the microporous membrane layer (1) is divided into a high-porosity area (11), a gradient transition area (12) and a uniform microporous area (13) from outside to inside along the water flow direction, and a continuous porosity gradient change is formed between the areas.

2. The aerated membrane structure of claim 1, wherein: The support skeleton layer (2) is composed of mutually parallel wave-shaped rib plates (21), the rib plate crests are bonded with the microporous membrane layer (1), and the troughs form gas channels.

3. The aerated membrane structure of claim 2, wherein: The wavelength of the wave-shaped rib plate (21) gradually increases along the air flow direction.

4. The aerated membrane structure of claim 1, wherein: The base layer (3) is provided with equidistantly distributed convex positioning columns (31), the positioning columns (31) penetrate through the support skeleton layer (2) and the microporous membrane layer (1) to form mechanical riveting.

5. The aerated membrane structure of claim 1, wherein: The application further comprises a ring-shaped sealing edge (4) which covers the four peripheral edges of the structure and is internally embedded with metal reinforcing ribs.

6. The aerated membrane structure of claim 5, wherein: The sealing edge (4) is provided with symmetrically distributed quick connector structures, and the quick connector structures comprise dovetail joints (411) and matching grooves (412).

7. The aerated membrane structure of claim 1, wherein: The microporous membrane layer (1) is covered with a hydrophobic coating which is gradually thinned in the gradient transition area (12).

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