Preparation method of polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic anti-fouling type PVC-MBR membrane

Abstract

The application provides a preparation method of a polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic anti-fouling type PVC-MBR membrane, which comprises the following steps: pretreatment of the PVC-MBR membrane, configuration of a modification solution, a layer-by-layer self-assembly method of PEG and PAE, and plasma enhanced chemical grafting. Firstly, polyethylene glycol and fatty alcohol polyoxyethylene ether are loaded on the surface of a hydrophobic PVC-MBR membrane by using a layer-by-layer self-assembly method, then the above-mentioned materials are placed in a high active oxygen plasma jet environment for a period of time, after being taken out, the modified membrane is washed with an ethanol and water mixed solution at normal temperature, and is dried in a vacuum drying box, thereby preparing a polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic anti-fouling modified PVC-MBR ultrafiltration membrane. By using the plasma enhanced chemical deposition technology, the polyethylene glycol and the fatty alcohol polyoxyethylene ether are used for surface modification of the PVC-MBR membrane, the anti-fouling property of the PVC-MBR membrane is strengthened, the unstable characteristics of the original membrane anti-fouling capacity and permeability are broken through, and the water permeation amount and the water quality of the membrane are improved.

Description

Technical Field

[0001] This invention relates to MBR membrane materials for wastewater treatment, specifically to a method for preparing a polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling PVC-MBR membrane. Background Technology

[0002] Membrane bioreactors (MBRs) use membrane modules to replace the secondary sedimentation tank in the traditional activated sludge process for sludge separation, and use filtration technology instead of simple sedimentation technology. This effectively improves upon the shortcomings of slow settling in secondary sedimentation tanks, and the effluent quality is significantly better than that of secondary sedimentation tanks. Part of the effluent can be recycled as reclaimed water. Therefore, MBRs have enormous application potential and academic research value in the field of wastewater treatment. However, most MBR membrane systems used in domestic wastewater treatment plants currently suffer from MBR membrane fouling. This is due to the physical or chemical interactions between pollutants such as organic macromolecules, colloids, and microorganisms in wastewater and the membrane surface, causing pollutants to deposit or adsorb on the MBR membrane surface or internal pore walls. In severe cases, this forms a filter cake layer, reducing or clogging the membrane pore size, leading to a continuous decrease in membrane permeability and separation performance, resulting in increased membrane resistance, reduced efficiency, and even shortened membrane lifespan.

[0003] To address the aforementioned shortcomings, surface functionalization of MBR membranes is necessary to improve their antifouling performance, thereby extending membrane lifespan and reducing membrane module operating costs. Current research on antifouling modification of MBR membranes primarily focuses on hydrophilic modification to construct highly hydrophilic antifouling membrane surfaces, which can provide excellent antifouling protective layers. Due to their highly hydrophilic surface, MOR membranes can tightly bind water molecules, forming a dense water layer on the membrane surface. These water molecules can form a barrier-like isolation layer on the surface of pollutants, making it difficult for pollutant molecules to approach the material's surface. This effectively prevents hydrophobic pollutants from adsorbing and depositing on the membrane surface, thus reducing membrane fouling.

[0004] In order to prepare products with superior antifouling performance compared to existing MBR membranes, this invention constructs an antifouling MBR membrane with strong hydrophilicity and low surface tension. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for preparing a polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling PVC-MBR membrane. By using plasma-enhanced chemical deposition technology, polyethylene glycol and fatty alcohol polyoxyethylene ether are used to modify the surface of the PVC-MBR membrane, thereby enhancing the antifouling properties of the PVC-MBR membrane, overcoming the characteristics of unstable antifouling ability and permeability of the original membrane, and improving the water permeability and effluent quality of the membrane.

[0006] To address the aforementioned technical problems, embodiments of the present invention provide a method for preparing a polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling PVC-MBR membrane, comprising the following steps:

[0007] S1. Pretreatment of PVC-MBR membrane: Place 10g of PVC-MBR membrane in 200ml of aqueous solution and pretreat under ultrasonic conditions for 30min (200W, 40℃). After removal, wash with deionized water and finally dry at 60℃.

[0008] S2. Preparation of modified solution: Dissolve 1g-5g of polyethylene glycol (PEG) completely in 100ml of deionized water to obtain PEG aqueous solution, and set aside; then dissolve 1g-5g of fatty alcohol polyoxyethylene ether (PAE) completely in 100ml of deionized water to obtain PAE aqueous solution, and set aside.

[0009] S3, PEG and PAE layer-by-layer self-assembly method: First, the PVC-MBR membrane pretreated in step S1 is completely immersed in the PEG aqueous solution prepared in step S2 at 40°C. After 30 minutes, it is taken out and drained. Then, the drained PVC-MBR membrane is completely immersed in the PAE aqueous solution prepared in step S2 at 40°C. After 30 minutes, it is taken out and drained. This process is repeated multiple times to obtain a layer-by-layer self-assembled PEG / PAE deposited PVC-MBR membrane.

[0010] S4. Plasma-enhanced chemical grafting: The layer-by-layer self-assembled PEG / PAE deposited PVC-MBR membrane is placed in a low-temperature plasma jet and treated repeatedly 2-5 times (10 min / time). Then, the layer-by-layer self-assembled PEG / PAE deposited PVC-MBR membrane is thoroughly washed at room temperature with a solution of 50% ethanol and water by volume, and dried at 120℃ for 10 min to obtain a polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling PVC-MBR membrane.

[0011] The PVC-MBR membrane used in step S1 has a porosity of 0.1-0.4 μm.

[0012] Preferably, a low-temperature plasma jet containing highly active oxygen is used in step S4.

[0013] The concentration range of polyethylene glycol and fatty alcohol polyoxyethylene ether used in step S2 is 10 g / L-50 g / L.

[0014] The beneficial effects of the above-described technical solution of the present invention are as follows:

[0015] 1. This invention provides a method for preparing a polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling PVC-MBR membrane. First, polyethylene glycol and fatty alcohol polyoxyethylene ether are loaded onto the surface of a hydrophobic PVC-MBR membrane using a layer-by-layer self-assembly method. Then, the materials are placed in a plasma jet environment containing highly active oxygen for a period of time. After removal, the modified membrane is thoroughly washed with a mixture of ethanol and water at room temperature and dried in a vacuum drying oven to prepare the polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling modified PVC-MBR ultrafiltration membrane. This invention utilizes plasma-enhanced chemical deposition technology to modify the surface of the PVC-MBR membrane with polyethylene glycol and fatty alcohol polyoxyethylene ether, enhancing the antifouling properties of the PVC-MBR membrane, overcoming the unstable antifouling ability and permeability of the original membrane, and improving the membrane's permeability and effluent water quality.

[0016] 2. Due to its excellent permeability and wastewater impurity rejection rate, PVC-MBR membranes are already widely used in modern industrial wastewater treatment plants. This invention uses polyethylene glycol and fatty alcohol polyoxyethylene ether to modify the PVC-MBR membrane under plasma jet treatment, effectively improving its antifouling performance. Compared to general MBR membrane products, this product has lower manufacturing costs, higher wastewater treatment efficiency, is environmentally friendly, and its excellent antifouling properties enhance its reusability, making it a relatively ideal wastewater treatment material. Attached Figure Description

[0017] Figure 1 The effects of different PEG and PAE concentrations on the contact angle of the PEG-PAE synergistic antifouling MBR membrane in Examples 1-5 of the present invention are shown.

[0018] Figure 2 The Fourier near-infrared spectra of the original PVC-MBR membrane described in this invention and Example 5 are shown. Detailed Implementation

[0019] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0020] This invention provides a method for preparing a polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling PVC-MBR membrane, comprising the following steps:

[0021] S1. Pretreatment of PVC-MBR membrane: Place 10g of PVC-MBR membrane in 200ml of aqueous solution and pretreat under ultrasonic conditions for 30min (200W, 40℃). After removal, wash with deionized water and finally dry at 60℃. The porosity of the PVC-MBR membrane used in this step is 0.1-0.4um.

[0022] S2. Preparation of modified solution: Dissolve 1g-5g of polyethylene glycol (PEG) completely in 100ml of deionized water to obtain PEG aqueous solution for later use; then dissolve 1g-5g of fatty alcohol polyoxyethylene ether (PAE) completely in 100ml of deionized water to obtain PAE aqueous solution for later use; the concentration range of polyethylene glycol and fatty alcohol polyoxyethylene ether used in this step is 10g / L-50g / L.

[0023] S3. Layer-by-layer self-assembly method of PEG and PAE: First, the PVC-MBR membrane pretreated in step S1 is completely immersed in the PEG aqueous solution prepared in step S2 at 40°C. After 30 minutes, it is taken out and drained. Then, the drained PVC-MBR membrane is completely immersed in the PAE aqueous solution prepared in step S2 at 40°C. After 30 minutes, it is taken out and drained. This process is repeated multiple times (following the steps mentioned above: first, the PVC-MBR membrane pretreated in step S1 is completely immersed in the PEG aqueous solution prepared in step S2 at 40°C. After 30 minutes, it is taken out and drained. Then, the drained PVC-MBR membrane is completely immersed in the PAE aqueous solution prepared in step S2 at 40°C. After 30 minutes, it is taken out and drained). This process yields a layer-by-layer self-assembled PEG / PAE deposited PVC-MBR membrane.

[0024] S4. Plasma-enhanced chemical grafting: The PVC-MBR membrane deposited by layer-by-layer self-assembled PEG / PAE is placed in a low-temperature plasma jet containing highly active oxygen and treated repeatedly 2-5 times (10 min / time). Then, the PVC-MBR membrane deposited by layer-by-layer self-assembled PEG / PAE is thoroughly washed at room temperature with a solution of 50% ethanol and water by volume, and dried at 120℃ for 10 min to obtain a polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling PVC-MBR membrane.

[0025] In step S4, three types of forces (van der Waals forces, hydrogen bonds, and ionic bonds) may exist between PEG and PAE and PVC. SEM and FTIR characterization confirmed that PEG and PAE were incorporated onto the membrane surface. Van der Waals forces and hydrogen bonds exhibit complex forms, as shown in Equation 1, where PVC exposes active oxygen groups after particle bombardment. Equation 2 represents ionic bonds.

[0026] Formula 1: Formula 2:

[0027] The technical solution of the present invention will be further illustrated below with reference to several specific embodiments.

[0028] Example 1

[0029] S1.1 Pretreatment of PVC-MBR membrane: Place 10g of PVC-MBR membrane in 200ml of aqueous solution and pretreat under ultrasonic conditions for 30min (200W, 40℃). After removal, wash with deionized water and finally dry at 60℃.

[0030] S1.2 Preparation of modified solution: Dissolve 1g of PEG in 100ml of deionized water to obtain a PEG aqueous solution with a concentration of 10g / L, and set aside; then dissolve 1g of PAE in 100ml of deionized water to obtain a PAE aqueous solution with a concentration of 10g / L, and set aside.

[0031] S1.3 Layer-by-layer self-assembly method of PEG and PAE: First, the pretreated PVC-MBR membrane in step S1.1 is completely immersed in a PEG aqueous solution at 40°C for 30 minutes. After removal and draining, the drained PVC-MBR membrane is then completely immersed in a PAE aqueous solution at 40°C for 30 minutes. After removal and draining, this process is repeated multiple times to obtain a layer-by-layer self-assembled PEG / PAE deposited PVC-MBR membrane.

[0032] S1.4 Plasma-enhanced chemical grafting technology: The layer-by-layer self-assembled PEG / PAE deposited PVC-MBR membrane obtained in step S1.4 is placed in a low-temperature plasma jet containing highly active oxygen and treated repeatedly 3 times (10 min / time). After that, the PVC-MBR membrane is thoroughly washed at room temperature with a solution of 50% ethanol and water by volume, and then dried at 120°C for 10 min. This yields a polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling PVC-MBR membrane.

[0033] Example 2

[0034] S2.1 Pretreatment of PVC-MBR membrane: Place 10g of PVC-MBR membrane in 200ml of aqueous solution and pretreat under ultrasonic conditions for 30min (200W, 40℃). After removal, wash with deionized water and finally dry at 60℃.

[0035] S2.2 Preparation of modified solution: Dissolve 1g of PEG in 100ml of deionized water to obtain a PEG aqueous solution with a concentration of 20g / L, and set aside; then dissolve 1g of PAE in 100ml of deionized water to obtain a PAE aqueous solution with a concentration of 20g / L, and set aside.

[0036] S2.3 Layer-by-layer self-assembly method of PEG and PAE: First, the pretreated PVC-MBR membrane in step S1.1 is completely immersed in a PEG aqueous solution at 40°C for 30 minutes. After removal and drainage, the drained PVC-MBR membrane is then completely immersed in a PAE aqueous solution at 40°C for 30 minutes. After removal and drainage, this process is repeated multiple times to obtain a layer-by-layer self-assembled PEG / PAE deposited PVC-MBR membrane.

[0037] S2.4 Plasma-enhanced chemical grafting technology: The layer-by-layer self-assembled PEG / PAE deposited PVC-MBR membrane obtained in step S1.4 is placed in a low-temperature plasma jet containing highly active oxygen and treated repeatedly 3 times (10 min / time). After that, the PVC-MBR membrane is thoroughly washed at room temperature with a solution of 50% ethanol and water by volume, and then dried at 120°C for 10 min. This yields a polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling PVC-MBR membrane.

[0038] Example 3

[0039] S3.1 Pretreatment of PVC-MBR membrane: Place 10g of PVC-MBR membrane in 200ml of aqueous solution and pretreat under ultrasonic conditions for 30min (200W, 40℃). After removal, wash with deionized water and finally dry at 60℃.

[0040] S3.2 Preparation of modified solution: Dissolve 1g of PEG in 100ml of deionized water to obtain a PEG aqueous solution with a concentration of 30g / L, and set aside; then dissolve 1g of PAE in 100ml of deionized water to obtain a PAE aqueous solution with a concentration of 30g / L, and set aside.

[0041] S3.3 Layer-by-layer self-assembly method of PEG and PAE: First, the pretreated PVC-MBR membrane in step S1.1 is completely immersed in a PEG aqueous solution at 40°C for 30 minutes. After removal and draining, the drained PVC-MBR membrane is then completely immersed in a PAE aqueous solution at 40°C for 30 minutes. After removal and draining, this alternating deposition process is repeated multiple times to obtain a layer-by-layer self-assembled PEG / PAE deposited PVC-MBR membrane.

[0042] S3.4 Plasma-enhanced chemical grafting technology: The layer-by-layer self-assembled PEG / PAE deposited PVC-MBR membrane obtained in step S1.4 is placed in a low-temperature plasma jet containing highly active oxygen and treated repeatedly 3 times (10 min / time). After that, the PVC-MBR membrane is thoroughly washed at room temperature with a solution of 50% ethanol and water by volume, and then dried at 120°C for 10 min. This yields a polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling PVC-MBR membrane.

[0043] Example 4

[0044] S4.1 Pretreatment of PVC-MBR membrane: Place 10g of PVC-MBR membrane in 200ml of aqueous solution and pretreat under ultrasonic conditions for 30min (200W, 40℃). After removal, wash with deionized water and finally dry at 60℃.

[0045] S4.2 Preparation of modified solution: Dissolve 1g of PEG in 100ml of deionized water to obtain a PEG aqueous solution with a concentration of 40g / L, and set aside; then dissolve 1g of PAE in 100ml of deionized water to obtain a PAE aqueous solution with a concentration of 40g / L, and set aside.

[0046] S4.3 Layer-by-layer self-assembly method of PEG and PAE: First, the pretreated PVC-MBR membrane from step S1.1 is completely immersed in a PEG aqueous solution at 40°C for 30 minutes. After removal and drainage, the drained PVC-MBR membrane is then completely immersed in a PAE aqueous solution at 40°C for 30 minutes. After removal and drainage, this process is repeated multiple times to obtain a layer-by-layer self-assembled PEG / PAE deposited PVC-MBR membrane.

[0047] S4.4 Plasma-enhanced chemical grafting technology: The layer-by-layer self-assembled PEG / PAE deposited PVC-MBR membrane obtained in step S1.4 is placed in a low-temperature plasma jet containing highly active oxygen and treated repeatedly 3 times (10 min / time). After that, the PVC-MBR membrane is thoroughly washed at room temperature with a solution of 50% ethanol and water by volume, and then dried at 120°C for 10 min. This yields a polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling PVC-MBR membrane.

[0048] Example 5

[0049] S5.1 Pretreatment of PVC-MBR membrane: Place 10g of PVC-MBR membrane in 200ml of aqueous solution and pretreat under ultrasonic conditions for 30min (200W, 40℃). After removal, wash with deionized water and finally dry at 60℃.

[0050] S5.2 Preparation of modified solution: Dissolve 1g of PEG in 100ml of deionized water to obtain a PEG aqueous solution with a concentration of 50g / L, and set aside; then dissolve 1g of PAE in 100ml of deionized water to obtain a PAE aqueous solution with a concentration of 50g / L, and set aside.

[0051] S5.3 Layer-by-layer self-assembly method of PEG and PAE: First, the pretreated PVC-MBR membrane in step S1.1 is completely immersed in a PEG aqueous solution at 40°C for 30 minutes. After removal and drainage, the drained PVC-MBR membrane is then completely immersed in a PAE aqueous solution at 40°C for 30 minutes. After removal and drainage, this process is repeated multiple times to obtain a layer-by-layer self-assembled PEG / PAE deposited PVC-MBR membrane.

[0052] S5.4 Plasma-enhanced chemical grafting technology: The layer-by-layer self-assembled PEG / PAE deposited PVC-MBR membrane obtained in step S1.4 is placed in a low-temperature plasma jet containing highly active oxygen and treated repeatedly 3 times (10 min / time). After that, the PVC-MBR membrane is thoroughly washed at room temperature with a solution of 50% ethanol and water by volume, and then dried at 120°C for 10 min. This yields a polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling PVC-MBR membrane.

[0053] Figure 1 The figures show the effect of different PEG and PAE concentrations on the contact angle of the PEG-PAE synergistic antifouling MBR membrane in Examples 1-5 of the present invention. Figure 1 It can be seen that the contact angle (θ° value) of the PEG-PAE synergistic antifouling MBR membrane gradually decreases with the increase of PEG-PAE aqueous solution concentration. When the PEG-PAE finishing solution concentration is 10 g L⁻¹, the θ° value of PEG-PAE-PVC is already less than 90°, meeting the standard for hydrophilic membranes. Further increasing the PEG-PAE finishing solution concentration to 50 g L⁻¹... -1 At this concentration, the θ° value of PEG-PAE-PVC can approach 50°. This means that increasing the concentration of the PEG-PAE finishing solution can significantly improve the hydrophilicity of the PEG-PAE-PVC membrane. This is mainly because the fatty alcohol polyoxyethylene ethers and polyethylene glycol on the membrane surface form hydrogen bonds with water molecules, enhancing the hydrophilicity of the surfactant molecules. As the number of hydrogen bonds between the hydrophilic groups on the membrane surface and water molecules increases, the interfacial properties of PEG-PAE-PVC are also enhanced, thereby improving its antifouling performance.

[0054] Figure 2The images show the Fourier near-infrared spectra of the original PVC-MBR membrane described in this invention and that of Example 5. For the original MBR membrane, its infrared spectrum exhibits some characteristic peaks, as shown in curve (b): 2840-2970 cm⁻¹. -1 It is the absorption peak of the stretching vibration of CH; 1710 cm⁻¹ -1 Absorption peak attributable to the stretching vibration of C=O; 1233 cm⁻¹ -1 It could be an absorption peak due to the bending vibration of the methyl or methylene group; 1078 cm⁻¹ -1 This is considered to be the absorption peak of CO stretching vibration. Since the base material of the MBR membrane is PVC, this is the 720cm peak. -1 The absorption peak is considered to be the stretching vibration of C-Cl. After modification with PEG and PAE, the infrared spectrum of the MBR membrane is basically similar to that before modification, as shown in curve (a). The typical differences are: (1) in the 3200-3400 cm⁻¹ range. -1 A relatively broad absorption peak appears at 2840-2970 cm⁻¹, which is the stretching vibration absorption peak of OH and is attributed to the characteristic absorption peaks of PEG and PAE. (2) 2840-2970 cm⁻¹ -1 The increased intensity of the CH stretching vibration absorption peak indicates that long-chain alkanes were grafted onto the macromolecular chains of the modified MBR membrane, which is considered a characteristic absorption peak of PAE. This result demonstrates that in a plasma environment, atoms, ions, free radicals, and electrons of various energies bombard the membrane surface, causing varying degrees of bond breakage in the PVC macromolecular chains. This leads to a chemical reaction between PVC and PEG and PAE, combining the effective groups of PEG and PAE with the original MBR membrane, thus regulating the interfacial tension of the MBR membrane. Analysis of the infrared spectra of the MBR membrane before and after modification reveals that the modified product is a PEG-PAE synergistic antifouling MBR membrane.

[0055] This invention first utilizes a layer-by-layer self-assembly method to load polyethylene glycol and fatty alcohol polyoxyethylene ether onto the surface of a hydrophobic PVC-MBR membrane. Then, the materials are treated for a period of time in a plasma jet environment containing highly active oxygen. After removal, the modified membrane is thoroughly washed with a mixture of ethanol and water at room temperature and dried in a vacuum drying oven to prepare a polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling modified PVC-MBR ultrafiltration membrane. This invention employs plasma-enhanced chemical deposition technology to modify the surface of the PVC-MBR membrane using polyethylene glycol and fatty alcohol polyoxyethylene ether, thereby enhancing the antifouling properties of the PVC-MBR membrane, overcoming the unstable antifouling ability and permeability of the original membrane, and improving the membrane's permeability and effluent water quality.

[0056] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling PVC-MBR membrane, characterized in that, Includes the following steps: S1. Pretreatment of PVC-MBR membrane: Place 10g of PVC-MBR membrane in 200ml of aqueous solution and pretreat under ultrasonic conditions for 30min (200W, 40℃). After removal, wash with deionized water and finally dry at 60℃. S2. Preparation of the modified solution: Dissolve 1g-5g of polyethylene glycol (PEG) completely in 100ml of deionized water to obtain a PEG aqueous solution for later use; then dissolve 1g-5g of fatty alcohol polyoxyethylene ether (PAE) completely in 100ml of deionized water to obtain a PAE aqueous solution for later use; the concentration range of polyethylene glycol and fatty alcohol polyoxyethylene ether used in step S2 is 10g / L-50g / L; S3, PEG and PAE layer-by-layer self-assembly method: First, the PVC-MBR membrane pretreated in step S1 is completely immersed in the PEG aqueous solution prepared in step S2 at 40°C. After 30 minutes, it is taken out and drained. Then, the drained PVC-MBR membrane is completely immersed in the PAE aqueous solution prepared in step S2 at 40°C. After 30 minutes, it is taken out and drained. This process is repeated multiple times to obtain a layer-by-layer self-assembled PEG / PAE deposited PVC-MBR membrane. S4. Plasma-enhanced chemical grafting: The PVC-MBR membrane deposited by layer-by-layer self-assembled PEG / PAE is placed in a low-temperature plasma jet and treated repeatedly 2-5 times (10 min / time). Then, the PVC-MBR membrane deposited by layer-by-layer self-assembled PEG / PAE is thoroughly washed at room temperature with a solution of 50% ethanol and water by volume, and dried at 120℃ for 10 min to obtain a polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling PVC-MBR membrane.

2. The method for preparing the polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling PVC-MBR membrane according to claim 1, characterized in that, The porosity of the PVC-MBR membrane used in step S1 is 0.1-0.4 μm.

3. The method for preparing the polyethylene glycol / fatty alcohol polyoxyethylene ether synergistic antifouling PVC-MBR membrane according to claim 1, characterized in that, In step S4, a low-temperature plasma jet containing highly active oxygen is used.

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