MBR (Membrane Bioreactor) flexible ultrafiltration flat sheet membrane

Abstract

The utility model discloses an MBR (Membrane Biological Reactor) flexible ultrafiltration flat sheet membrane, which belongs to the technical field of purification membranes, and adopts the technical scheme that the MBR flexible ultrafiltration flat sheet membrane comprises a wear-resistant antibacterial outer layer, a stress dispersion support layer is arranged at the bottom of the wear-resistant antibacterial outer layer, and an efficient ultrafiltration separation layer is arranged at the bottom of the stress dispersion layer. The bottom of the efficient ultrafiltration separation layer is provided with an elastic buffer damping layer, the bottom of the elastic buffer damping layer is provided with a corrosion-resistant anti-seepage inner layer, the wear-resistant antibacterial outer layer is arranged to inhibit bacterium breeding, prevent biological pollution, guarantee long-term cleanness of the membrane and avoid secondary pollution of effluent quality, the stress dispersion supporting layer provides strong supporting force, and the service life of the membrane is prolonged. The elastic buffer damping layer absorbs water flow impact energy, reduces membrane vibration and reduces the damage risk, the efficient ultrafiltration separation layer can accurately remove various micro pollutants including small molecules and special pollutants in water, and the advanced wastewater treatment requirements of specific industries are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of purification membrane, especially relates to a MBR flexible ultrafiltration flat sheet membrane. BACKGROUND

[0002] In the process of the continuous development of MBR membrane technology, the existing MBR flexible ultrafiltration flat sheet membrane has many problems to be solved, in actual use, the outer layer protection ability of the traditional membrane is insufficient, such as the ordinary plastic outer layer, which is neither wear-resistant nor easy to breed bacteria, resulting in the service life of the membrane being shortened, and the water quality after treatment is easy to be secondarily polluted, in terms of support structure, some membranes use simple support materials or structures, which cannot effectively disperse pressure, under the action of water pressure and water flow shear force for a long time, the membrane is easy to have local stress concentration, and then rupture or damage occurs, which seriously affects the normal operation of the membrane, from the filtration performance;

[0003] The existing ultrafiltration separation layer has limited removal capacity for small molecule pollutants and special pollutants, common membrane materials and pore size design are difficult to meet the requirements of deep treatment of wastewater in certain specific industries, and the poor buffer performance of the membrane is also a big problem, the impact and fluctuation of water flow will make the membrane vibrate frequently, accelerate the aging and damage of the membrane, in addition, most traditional membranes have poor permeability and chemical stability when facing high corrosive water quality, the membrane material is easy to be corroded and penetrated, resulting in filtration failure.

[0004] Therefore, the MBR flexible ultrafiltration flat sheet membrane is provided. CONTENT OF THE UTILITY MODEL

[0005] The utility model discloses a kind of MBR flexible ultrafiltration flat sheet membranes, can solve the problem that the existing ultrafiltration separation layer has limited removal capacity for small molecule pollutants and special pollutants, common membrane materials and pore size design are difficult to meet the requirements of deep treatment of wastewater in certain specific industries, and the poor buffer performance of the membrane is also a big problem, the impact and fluctuation of water flow will make the membrane vibrate frequently, accelerate the aging and damage of the membrane, in addition, most traditional membranes have poor permeability and chemical stability when facing high corrosive water quality, the membrane material is easy to be corroded and penetrated, resulting in filtration failure.

[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of MBR flexible ultrafiltration flat sheet membrane, including wear-resistant antibacterial outer layer, the bottom of the wear-resistant antibacterial outer layer is equipped with stress dispersion support layer, the bottom of the stress dispersion layer is equipped with high-efficiency ultrafiltration separation layer, the bottom of the high-efficiency ultrafiltration separation layer is equipped with elastic buffer damping layer, the bottom of the elastic buffer damping layer is equipped with corrosion-resistant impermeable inner layer, the outside of the corrosion-resistant impermeable inner layer is equipped with sealing frame structure, and the sealing frame structure is equipped in the bottom of corrosion-resistant impermeable inner layer.

[0007] Preferably, the wear-resistant antibacterial outer layer is coated by blending titanium dioxide nanoparticles and silver-containing antibacterial polymer.

[0008] Preferably, the stress dispersion support layer is a composite structure of high-strength alloy fiber woven net and porous ceramic, the diameter of the alloy fiber is 0.05-0.1mm, the porosity of the ceramic is 40%-50%, and the pore size is 0.2-0.4mm.

[0009] Preferably, the high-efficiency ultrafiltration separation layer is made of polyimide-graphene composite membrane material, the pore size is 0.005-0.05μm, and the molecular weight cut-off is 3000-15000 Dalton.

[0010] Preferably, the elastic buffer damping layer is a foamed material of silicone rubber and polyurethane blended with a density of 25-40kg / m 3 .

[0011] Preferably, the corrosion-resistant and anti-permeation inner layer is a fluorocarbon polymer coating with a thickness of 0.06-0.1mm, acid and alkali resistance and high anti-permeability.

[0012] Preferably, a nano adhesive transition layer is arranged between two adjacent layers.

[0013] Preferably, the sealing frame structure is made of thermoplastic elastomer material, and a sealing rubber strip is arranged in the frame.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] The application can inhibit bacterial growth and prevent biological pollution by the wear-resistant antibacterial outer layer, can ensure long-term cleaning of the membrane, can avoid secondary pollution of effluent water quality, can provide strong support and disperse pressure by the stress dispersion support layer, can prevent stress concentration, can absorb water flow impact energy by the elastic buffer damping layer, can reduce membrane vibration and reduce damage risk, can accurately remove various small pollutants in water, including small molecules and special pollutants, by the high-efficiency ultrafiltration separation layer, can meet the requirements of specific industry wastewater deep treatment, can improve water quality, can resist acid and alkali corrosion by the corrosion-resistant and anti-permeation inner layer, can prevent the membrane from being corroded and penetrated, and can prevent treated water from being reversely permeated, can ensure stable operation of the membrane under complex water quality, and the sealing frame structure can ensure the sealing property of the membrane assembly and prevent water leakage, and can improve overall performance. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a whole structure diagram of the MBR flexible ultrafiltration flat membrane of the utility model;

[0017] Figure 2 It is a structure schematic diagram of the main body structure of the utility model;

[0018] Figure 3 It is a whole structure schematic diagram of the utility model.

[0019] Figure 4 The utility model discloses a connection diagram of sealed frame structure.

[0020] In the drawing, 1, wear-resistant antibacterial outer layer, 2, stress dispersion support layer, 3, high-efficiency ultrafiltration separation layer, 4, elastic buffer damping layer, 5, corrosion-resistant impermeable inner layer, 6, sealed frame structure. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0022] Please refer to Figures 1-4 The utility model provides technical schemes:

[0023] A kind of MBR flexible ultrafiltration flat sheet membrane, including wear-resistant antibacterial outer layer 1, the bottom of wear-resistant antibacterial outer layer 1 is equipped with stress dispersion support layer 2, the bottom of stress dispersion layer 2 is equipped with high-efficiency ultrafiltration separation layer 3, the bottom of high-efficiency ultrafiltration separation layer 3 is equipped with elastic buffer damping layer 4, the bottom of elastic buffer damping layer 4 is equipped with corrosion-resistant impermeable inner layer 5, the outside of corrosion-resistant impermeable inner layer 5 is equipped with sealed frame structure 6, sealed frame structure 6 is equipped in the bottom of corrosion-resistant impermeable inner layer 5.

[0024] In the embodiment: by setting wear-resistant antibacterial outer layer 1, inhibit bacteria breeding, prevent biological pollution, guarantee the long-term cleaning of membrane, and avoid secondary pollution of effluent water quality, stress dispersion support layer 2 provides strong support force, disperses pressure, prevents stress concentration, elastic buffer damping layer 4 absorbs water flow impact energy, reduces membrane vibration, reduces damage risk, high-efficiency ultrafiltration separation layer 3 can accurately remove various small pollutants in water, including small molecules and special pollutants, meet the requirement of specific industry wastewater advanced treatment, improve water quality, corrosion-resistant impermeable inner layer 5 is resistant to acid and alkali corrosion, prevents membrane from being corroded and penetrated, simultaneously has high impermeability, prevents treated water from reverse osmosis, ensures that membrane is stably operated under complex water quality, sealed frame structure 6 ensures the sealing property of membrane assembly, prevents water leakage, improves overall performance.

[0025] Specifically, as shown in Figure 1 、 Figure 3 Wear-resistant antibacterial outer layer 1 adopts titanium dioxide nanoparticles and silver-containing antibacterial polymer blend coating.

[0026] Specifically, as shown in Figure 2 、 Figure 3As shown, the stress dispersion support layer 2 is a composite structure of high-strength alloy fiber woven net and porous ceramic, the diameter of the alloy fiber is 0.05-0.1mm, the porosity of the ceramic is 40%-50%, and the pore size is 0.2-0.4mm.

[0027] Specifically, as shown in Figure 2 , the high-efficiency ultrafiltration separation layer 3 is made of polyimide-graphene composite membrane material, the pore size is 0.005-0.05μm, and the molecular weight cut-off is 3000-15000 daltons.

[0028] Specifically, as shown in Figure 3 , Figure 4 , the elastic buffer damping layer 4 is a blended and foamed material of silicone rubber and polyurethane, the density is 25-40kg / m 3 .

[0029] Specifically, as shown in Figure 3 , Figure 4 , the corrosion-resistant and impermeable inner layer 5 is a fluorocarbon polymer coating, the thickness is 0.06-0.1mm, and it has acid and alkali resistance and high impermeability.

[0030] Specifically, as shown in Figure 2 , a nano adhesive transition layer is arranged between the two adjacent layers.

[0031] Specifically, as shown in Figure 4 , the sealing frame structure 6 is made of thermoplastic elastomer material, and a sealing rubber strip is arranged inside the frame.

[0032] In the embodiment: the wear-resistant antibacterial outer layer 1 adopts a titanium dioxide nanoparticle and silver-containing antibacterial polymer blended coating, under light conditions, the titanium dioxide nanoparticles play a photocatalytic self-cleaning role, decomposing organic pollutants on the membrane surface; the silver-containing antibacterial polymer inhibits the breeding of bacteria and prevents biological pollution, ensuring long-term cleaning and hygiene of the membrane, the stress dispersion support layer 2 is a high-strength alloy fiber woven net and porous ceramic composite structure, providing high-strength support force, ensuring good water permeability, while effectively dispersing pressure and avoiding stress concentration, the efficient ultrafiltration separation layer 3 combines the excellent mechanical properties of polyimide and the high specific surface area and excellent screening performance of graphene, can efficiently remove various small pollutants in water, significantly improve the filtration effect, the elastic buffer damping layer 4 is a silicone rubber and polyurethane blended foaming material, has good elasticity and buffering performance, can effectively absorb the energy generated by water flow impact, reduce the vibration of the membrane, prolong the service life of the membrane, the corrosion-resistant and impermeable inner layer 5 is a fluorocarbon polymer coating, has excellent acid and alkali corrosion resistance and impermeability, can effectively resist the corrosion of high corrosive water quality, prevent the reverse osmosis of treated water, a nano adhesive transition layer is arranged between adjacent two layers, through the nano-level adhesive effect, the interlayer bonding force is greatly enhanced, ensuring the stability and integrity of the membrane structure, a sealing rubber strip is arranged in the sealing frame, the structure ensures the sealing property of the membrane assembly during installation and use, prevents water leakage.

[0033] Working principle: firstly, the MBR flexible ultrafiltration flat sheet membrane has good protection performance, the wear-resistant antibacterial outer layer 1 effectively protects the membrane body, prolongs the service life, and at the same time guarantees that the effluent water quality is not secondarily polluted, the stress dispersion support layer 2 and the elastic buffer damping layer 4 enable the membrane to withstand greater pressure and water flow impact, reduce the risk of damage, the efficient ultrafiltration separation layer 3 has strong removal capacity for various pollutants, can meet higher water quality requirements, the corrosion-resistant and impermeable inner layer 5 ensures stable operation of the membrane under complex water quality conditions, prevents permeation pollution, the nano adhesive transition layer and the sealing frame structure 6 enhance the overall performance and sealing property of the membrane.

[0034] The above is only a preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A MBR flexible ultrafiltration flat sheet membrane comprising an abrasion resistant antibacterial outer layer (1), characterized in that: The bottom of the wear-resistant and antibacterial outer layer (1) is provided with a stress dispersion support layer (2), the bottom of the stress dispersion support layer (2) is provided with a high-efficiency ultrafiltration separation layer (3), the bottom of the high-efficiency ultrafiltration separation layer (3) is provided with an elastic buffer damping layer (4), the bottom of the elastic buffer damping layer (4) is provided with a corrosion-resistant and anti-permeation inner layer (5), the outer side of the corrosion-resistant and anti-permeation inner layer (5) is provided with a sealing frame structure (6), and the sealing frame structure (6) is arranged at the bottom of the corrosion-resistant and anti-permeation inner layer (5).

2. The MBR flexible ultrafiltration flat sheet membrane according to claim 1, characterized in that: The wear-resistant and antibacterial outer layer (1) adopts a titanium dioxide nanoparticle and silver-containing antibacterial polymer blended coating.

3. The MBR flexible ultrafiltration flat sheet membrane according to claim 1, wherein: The stress dispersion support layer (2) is a high-strength alloy fiber woven net and porous ceramic composite structure, the diameter of the alloy fiber is 0.05-0.1mm, the porosity of the ceramic is 40%-50%, and the pore size is 0.2-0.4mm.

4. The MBR flexible ultrafiltration flat sheet membrane according to claim 1, wherein: The high-efficiency ultrafiltration separation layer (3) is made of a polyimide-graphene composite membrane material, the pore size is 0.005-0.05μm, and the molecular weight cut-off is 3000-15000 daltons.

5. The MBR flexible ultrafiltration flat sheet membrane according to claim 1, wherein: The elastic buffer damping layer (4) is a silicon rubber and polyurethane blended foamed material, with a density of 25-40 kg / m 3 .

6. The MBR flexible ultrafiltration flat sheet membrane according to claim 1, wherein: The corrosion-resistant and anti-permeation inner layer (5) is a fluorocarbon polymer coating with a thickness of 0.06-0.1mm, which has acid and alkali resistance and high impermeability.

7. The MBR flexible ultrafiltration flat sheet membrane according to claim 1, wherein: A nano adhesive transition layer is arranged between adjacent two layers.

8. The MBR flexible ultrafiltration flat sheet membrane according to claim 1, wherein: The sealing frame structure (6) is made of a thermoplastic elastomer material, and a sealing rubber strip is arranged inside the frame.

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