Novel filter element with sewage oil separation function

Abstract

The invention relates to the technical field of water purification filter elements, and discloses a novel filter element with a sewage oil separation function, the novel filter element comprises a membrane head, a super-tough adhesive tape is arranged on the inner wall of the membrane head, a membrane wire is arranged in the super-tough adhesive tape, the membrane wire is bent close to the center end, the two ends are close to each other to form a U shape, the two ends of the membrane wire both face the membrane head, and the two ends of the membrane wire face the membrane head. The end plane of the membrane wire is flush with the plane of the side, away from the membrane wire, of the membrane head, a filtering hole is formed in the middle of the membrane wire and penetrates through the center of the membrane wire, a polymerization net is arranged on the outer wall of the membrane wire, and the upper portion of the polymerization net is fixedly connected to the bottom of the membrane head. Compared with the prior art, the filter element has the advantages that the membrane head can generate larger binding force on the membrane filaments, so that the membrane filaments can be fixed only by arranging a circle of super-tough adhesive tape on the inner wall of the membrane head, and the problems that when a traditional filter element is combined with the membrane head, a full-glue-pouring mode is usually adopted for fixing, a large amount of glue is left after cutting, and the membrane head cannot be fixed easily are solved. Therefore, the problem that the water yield is small and the net is easily blocked is solved.

Description

Technical Field

[0001] The invention relates to the technical field of water purification filter elements, in particular to a novel filter element with sewage oil separation function. Background Art

[0002] The filter element with oil-separation function for sewage plays a key role in sewage treatment. It can effectively solve the problem of oil-containing sewage purification. When sewage flows in, oil molecules are adsorbed by the surface of the filter element material, and water molecules pass smoothly, thus achieving oil-water separation. Compared with traditional separation methods, it has significant advantages. The separation efficiency is extremely high, which can greatly reduce the oil content of the treated sewage and meet strict emission standards; it has strong anti-fouling ability, is not easily blocked by impurities, has a long service life, and reduces the trouble and cost of frequent replacement; it has a wide range of applications, whether it is high-concentration oil-containing wastewater from industrial production, or sewage from catering, shipping and other industries, it can excellently complete the purification task, providing a strong boost to the development of the sewage treatment field.

[0003] Traditional filter elements are often fixed with full glue when combined with membrane heads. Since a large amount of glue will remain after cutting, it is easy to cause problems such as small water output and easy clogging of the network. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a new filter element with sewage oil separation function, which solves the problem that traditional filter elements are often fixed in a full glue-filling manner when combined with membrane heads. Since a large amount of glue will remain after cutting, it is easy to cause small water output and easy network clogging.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a new type of filter element with sewage oil separation function, including a membrane head, the inner wall of the membrane head is provided with a super tough tape, the interior of the super tough tape is provided with a membrane wire, the membrane wire is bent near the center end and the two ends are close to form a U shape, both ends of the membrane wire are facing the membrane head, the end plane of the membrane wire is flush with the plane of the side of the membrane head away from the membrane wire, a filter hole is opened in the middle of the membrane wire, the filter hole passes through the center of the membrane wire, the outer wall of the membrane wire is provided with a polymer mesh, and the upper part of the polymer mesh is fixedly connected to the bottom of the membrane head.

[0006] Preferably, the membrane filaments include the following raw materials in parts by weight: 70-95 parts of polymer matrix, 5-20 parts of nano additives, 10-25 parts of polyethylene glycol and 50-200 parts of N-methylpyrrolidone.

[0007] Preferably, the polymer matrix comprises the following raw materials in parts by weight: 35-65 parts of polyethersulfone and 15-50 parts of polyvinylidene fluoride.

[0008] Preferably, the nano additive comprises the following raw materials in parts by weight: 3-10 parts of nano titanium dioxide and 2-10 parts of nano silver particles.

[0009] Preferably, the method for preparing the membrane filaments comprises the following steps: S1. Raw material preparation: weigh each component raw material according to the formula; S2, nanomaterial dispersion: adding weighed nano titanium dioxide and nano silver particles to N-methyl pyrrolidone, wherein the N-methyl pyrrolidone is 20%-30% of the total amount, and using an ultrasonic disperser to perform ultrasonic treatment on the mixed solution for about 30-60 minutes to form a nano additive solution; S3, polymer dissolution: adding polyethersulfone and polyvinylidene fluoride to N-methylpyrrolidone, wherein the N-methylpyrrolidone accounts for 70%-80% of the total amount, turning on the stirrer, heating to 60-80° C. on a heating device, and continuously stirring for 3-6 hours to form a polymer solution; S4, preparation of mixed solution: adding the nano-additive solution to the polymer solution while continuously stirring, then adding polyethylene glycol, and continuing stirring for 2-4 hours to form a casting solution; S5, degassing treatment: put the casting solution into a vacuum drying oven and degas for 30-60 minutes; S6, film preparation: pour the degassed casting solution onto a glass plate, use a scraper to scrape the film at a uniform speed, control the film thickness to be 100-300 microns, and then soak the scraped glass plate in deionized water for 1-2 hours; S7. Cleaning and drying of the membrane: remove the soaked membrane from the glass plate, rinse with deionized water, and then put the cleaned membrane into a drying oven, control the temperature of the drying oven at 40-60°C for 12-24 hours; S8, filter element molding: use a film cutting machine to cut the dried film.

[0010] Preferably, in S2, the ultrasonic treatment uses an ultrasonic cleaner, controls the ultrasonic frequency to be between 20kHz and 80kHz, controls the ultrasonic power to be between 100W and 1000W, controls the ultrasonic time to be between 5min and 30min, and controls the ultrasonic temperature to be between 30°C and 60°C.

[0011] Preferably, in S3, the stirrer is a magnetic stirrer, and the rotation speed of the magnetic stirrer is controlled to be 300-600 rpm.

[0012] Preferably, in S5, the pressure of the vacuum drying oven is controlled at -0.08 MPa to -0.1 MPa.

[0013] The present invention provides a novel filter element with sewage oil separation function. It has the following beneficial effects: 1. In the present invention, a large contraction force can be exerted on the membrane filaments through the membrane head, so that the membrane filaments can be fixed by only setting a circle of super-tough adhesive tape on the inner wall of the membrane head, thereby avoiding injecting a large amount of adhesive into the interior of the membrane head, thereby forming a filter element without adhesive injection, so that the filtering effect is not affected by the colloid, and at the same time the water output is increased and the network is not easily blocked, thereby solving the problem that the traditional filter element is often fixed by full adhesive injection when combined with the membrane head, because a large amount of adhesive will remain after cutting, which is easy to cause small water output and easy network blocking.

[0014] 2. In the present invention, polyethersulfone has the characteristics of high strength, high temperature resistance, chemical corrosion resistance, etc., and polyvinylidene fluoride has good weather resistance, water resistance and chemical stability. The combination of the two gives the membrane fiber excellent comprehensive performance, enabling it to maintain stable filtration effect and mechanical strength under different water quality and environmental conditions.

[0015] 3. In the present invention, by adding nano titanium dioxide and nano silver particles into N-methylpyrrolidone, and treating with an ultrasonic disperser under the conditions of ultrasonic frequency of 20kHz-80kHz, ultrasonic power of 100W-1000W, ultrasonic time of 5min-30min, and ultrasonic temperature of 30℃-60℃, the nano particles can be evenly dispersed in the solution, giving full play to their performance advantages, avoiding agglomeration, and ensuring that the nano additives are evenly distributed in the membrane filaments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the top view structure of the present invention; Figure 2 It is a schematic diagram of the partial cross-sectional structure of the membrane wire and the membrane head of the present invention; Figure 3 It is a schematic diagram of the front view structure of the polymer network of the present invention; Figure 4 It is a schematic diagram of the front view structure of the membrane filament of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the membrane filament of the present invention.

[0017] Among them, 1. membrane head; 2. membrane wire; 3. super tough tape; 4. filter hole; 5. polymer mesh. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Please refer to the attached Figure 1 -Attached Figure 5 An embodiment of the present invention provides a new type of filter element with sewage oil separation function, including a membrane head 1, an inner wall of the membrane head 1 is provided with a super tough tape 3, a membrane wire 2 is provided inside the super tough tape 3, the membrane wire 2 is bent near the center end and the two ends are close to form a U shape, both ends of the membrane wire 2 are facing the membrane head 1, the end plane of the membrane wire 2 is flush with the side plane of the membrane head 1 away from the membrane wire 2, a filter hole 4 is opened in the middle of the membrane wire 2, the filter hole 4 passes through the center of the membrane wire 2, and the outer wall of the membrane wire 2 is provided with a polymer mesh 5, and the upper part of the polymer mesh 5 is fixedly connected to the bottom of the membrane head 1.

[0020] Specifically, the membrane head 1 can play the role of combining the membrane filaments 2, generate a large contraction force on the membrane filaments 2, and wrap the ends of the membrane filaments 2 tightly inside; the super-tough tape 3 can play the role of connecting the membrane head 1 and the membrane filaments 2, so that the membrane filaments 2 can be fixed only on the inner wall of the membrane head 1 and the outer circle, thereby avoiding injecting a large amount of glue into the membrane head 1, thereby forming a filter element without glue injection, so that the filtering effect is not affected by the colloid, and at the same time, the water output is increased and the network is not easy to be blocked, thereby solving the problem that the traditional filter element is often fixed by full glue injection when combined with the membrane head, because there will be a large amount of glue residue after cutting, which is easy to cause small water output and easy network blocking; the membrane filaments 2 can play the role of filtering oily wastewater; the filtered pure water can flow out through the filter hole 4; the arranged membrane filaments 2 can be wrapped by the polymer mesh 5 to prevent the membrane filaments 2 from spreading, thereby ensuring the convenience of installation; the membrane filaments 2 are bent near the center end to form a U shape at both ends, so that both ends of the membrane filaments 2 can be inside the membrane head 1.

[0021] The membrane filament 2 comprises the following raw materials in parts by weight: 70-95 parts of a polymer matrix, 5-20 parts of a nano additive, 10-25 parts of polyethylene glycol and 50-200 parts of N-methylpyrrolidone.

[0022] Specifically, the polymer matrix can provide the membrane filaments with good mechanical strength and stability, making them not easy to break or deform during use, and can withstand a certain amount of pressure and tension to ensure the structural integrity of the membrane filaments; the nano-additives can interact with the polymer matrix at the microscopic level to improve the microstructure of the membrane filaments, making the pore size distribution of the membrane filaments more uniform, thereby improving the filtration accuracy and separation efficiency of the membrane filaments; through the interaction between polyethylene glycol and the polymer matrix and other components, pores of appropriate size and uniform distribution are formed in the membrane filaments, so that the membrane filaments have appropriate filtration accuracy, can effectively separate substances of different particle sizes, improve the selectivity and separation performance of the membrane filaments, and at the same time can improve the hydrophilicity of the membrane filaments, making it easier for the membrane filaments to contact and interact with water. The effect is beneficial to the penetration of water, reducing the contact angle of water on the surface of the membrane filaments, reducing the adsorption and retention of water on the surface of the membrane filaments, thereby increasing the water flux of the membrane filaments and improving the filtration efficiency of the membrane filaments; N-methylpyrrolidone can effectively dissolve the polymer matrix, nano-additives, polyethylene glycol, etc. to form a uniform casting liquid, ensuring that all components are fully mixed in the solution, laying the foundation for the preparation of membrane filaments with uniform and stable performance, and at the same time, it can also adjust the viscosity and fluidity of the casting liquid, so that it can be smoothly coated, stretched and other operations during the preparation of the membrane filaments, which is beneficial to the formation of membrane filaments with good morphology and structure, and after the membrane filaments are formed, an appropriate amount of N-methylpyrrolidone residue may also have a certain positive effect on the flexibility and other properties of the membrane filaments.

[0023] The polymer matrix comprises the following raw materials in parts by weight: 35-65 parts of polyethersulfone and 15-50 parts of polyvinylidene fluoride.

[0024] Specifically, polyethersulfone itself has high mechanical strength and rigidity, while polyvinylidene fluoride has good flexibility and impact resistance. The combination of the two makes the polymer matrix have sufficient strength to resist external pressure, tension and other forces, while also having good toughness and not prone to brittle fracture. Both polyethersulfone and polyvinylidene fluoride have good thermal stability. After mixing, the dimensional stability of the polymer matrix can be further improved; polyethersulfone and polyvinylidene fluoride both have good chemical corrosion resistance and have high tolerance to a variety of chemical substances such as acids, alkalis, and organic solvents. The polymer matrix formed by the composite of the two has further improved chemical corrosion resistance, can maintain stable performance in a variety of chemical environments, is not easily corroded or degraded by chemical substances, and extends the service life of the membrane material; polyethersulfone and polyvinylidene fluoride both have high glass transition temperatures and thermal decomposition temperatures. The mixed polymer matrix inherits the properties of the two. The heat resistance of both materials is good, and they can maintain stable physical and chemical properties at higher temperatures. They are not prone to thermal deformation, thermal degradation, etc. At the same time, the composite of the two materials may optimize the thermal conductivity of the polymer matrix to a certain extent, making it have a more suitable thermal conductivity, which is beneficial to heat transfer and temperature control during membrane separation, avoiding local overheating or overcooling, and improving the efficiency and stability of the membrane separation process. During the membrane formation process, polyethersulfone and polyvinylidene fluoride will interact to form a unique phase separation structure due to their different molecular structures and physical properties, which is helpful to form a microporous structure with uniform pore size distribution and appropriate size, thereby improving the filtration accuracy and separation efficiency of the membrane, and can effectively separate substances of different particle sizes.

[0025] The nano additive comprises the following raw materials in parts by weight: 3-10 parts of nano titanium dioxide and 2-10 parts of nano silver particles.

[0026] Specifically, nano-titanium dioxide has strong redox ability and can produce hydroxyl radicals and superoxide anion radicals with strong oxidizing properties, which can decompose organic pollutants adsorbed on the membrane surface into harmless substances such as carbon dioxide and water, realize self-cleaning of the membrane surface, effectively reduce the deposition and accumulation of organic pollutants on the membrane, maintain the permeability of the membrane, and extend the service life of the membrane; nano-silver particles have broad-spectrum antibacterial properties and can combine with sulfhydryl groups in bacterial cells to interfere with the metabolic process of bacteria, destroy the respiratory chain and enzyme system of bacteria, thereby inhibiting the growth and reproduction of bacteria, and can effectively prevent the growth of microorganisms on the membrane surface and avoid microbial contamination. The membrane flux decreases and membrane performance deteriorates, ensuring the hygiene and safety of the membrane during use; the combination of nano-titanium dioxide and nano-silver particles realizes the synergistic effect of multiple functions such as photocatalytic self-cleaning, antibacterial, antiviral, and UV shielding, providing more comprehensive protection and functional improvement for the membrane material, so that the membrane can not only effectively filter and separate substances, but also maintain good performance and hygiene in a complex environment. At the same time, the two complement each other, make up for the deficiencies in the functions of a single substance, and jointly improve the comprehensive performance of the membrane material, broaden the application range of the membrane, and enable it to play a better role in water treatment, food and beverage, medical and health care and other fields.

[0027] The preparation method of the membrane filament 2 comprises the following steps: S1. Raw material preparation: weigh each component raw material according to the formula; S2. Nanomaterial dispersion: Add weighed nano titanium dioxide and nano silver particles into N-methylpyrrolidone, where N-methylpyrrolidone accounts for 20%-30% of the total amount, and use an ultrasonic disperser to perform ultrasonic treatment on the mixed solution for about 30-60 minutes to form a nano additive solution; S3, polymer dissolution: add polyethersulfone and polyvinylidene fluoride into N-methylpyrrolidone, N-methylpyrrolidone is 70%-80% of the total amount, turn on the stirrer, heat to 60-80°C on a heating device, and continue stirring for 3-6 hours to form a polymer solution; S4, preparation of mixed solution: adding the nano-additive solution to the polymer solution while continuously stirring, then adding polyethylene glycol, and continuing stirring for 2-4 hours to form a casting solution; S5, degassing treatment: put the casting solution into a vacuum drying oven and degas for 30-60 minutes; S6, film preparation: pour the degassed casting solution onto a glass plate, use a scraper to scrape the film at a uniform speed, control the film thickness to be 100-300 microns, and then soak the scraped glass plate in deionized water for 1-2 hours; S7. Cleaning and drying of the membrane: remove the soaked membrane from the glass plate, rinse with deionized water, and then put the cleaned membrane into a drying oven, control the temperature of the drying oven at 40-60°C for 12-24 hours; S8, filter element molding: use a film cutting machine to cut the dried film.

[0028] In S2, the ultrasonic treatment uses an ultrasonic cleaner, controls the ultrasonic frequency to be between 20kHz and 80kHz, controls the ultrasonic power to be between 100W and 1000W, controls the ultrasonic time to be between 5min and 30min, and controls the ultrasonic temperature to be between 30°C and 60°C.

[0029] Specifically, through step S2, nano titanium dioxide and nano silver particles are added to 20%-30% of the total amount of N-methylpyrrolidone, and ultrasonic treatment is performed for 30-60 minutes. By utilizing the cavitation effect and mechanical vibration of ultrasound, the agglomeration of the nano particles is effectively broken, so that the nano particles are evenly dispersed in the solvent to form a stable nano additive solution, so that the nano particles can be evenly distributed in the polymer matrix in the subsequent film-making process, giving full play to the special properties of the nano materials such as photocatalysis and antibacterial properties; Through step S2, nano titanium dioxide and nano silver particles are added to 20%-30% of the total amount of N-methylpyrrolidone, and ultrasonic treatment is performed for 30-60 minutes, thereby utilizing the cavitation effect and mechanical vibration of ultrasound to effectively break the agglomeration of nano particles, so that they are evenly dispersed in the solvent to form a stable nano additive solution, so that they can be evenly distributed in the polymer matrix in the subsequent film-making process, giving full play to the special properties of the nano materials such as photocatalysis and antibacterial properties; Through step S3, polyethersulfone and polyvinylidene fluoride are added to 70%-80% of the total amount of N-methylpyrrolidone, and stirred at 60-80°C for 3-6 hours, so as to help the polymer to fully dissolve in the solvent and form a uniform and stable polymer solution, thereby creating conditions for subsequent mixing to form a high-quality casting solution and ensure the structural uniformity and mechanical properties of the membrane; The nano-additive solution is added to the polymer solution through step S4, and polyethylene glycol is added and stirred for 2-4 hours to promote the full mixing of the components, thereby making the nano-materials, polymers and porogens uniformly distributed to form a stable casting solution, which is conducive to forming a membrane structure with uniform pore size distribution and appropriate porosity in the subsequent membrane making process, thereby improving the filtration and separation performance of the membrane; The casting liquid is placed in a vacuum drying oven for degassing for 30-60 minutes in step S5, and the pressure of the gas in the bubbles is reduced by the vacuum environment, so that the bubbles expand and escape from the casting liquid, thereby removing the bubbles and avoiding defects such as voids or discontinuous structures during the film forming process, thereby ensuring the integrity and strength of the film, and thus improving the filtration accuracy and service life of the film; In step S6, the film is scraped at a uniform speed using a scraper, and the film thickness is controlled at 100-300 microns. The thickness of the film can be precisely controlled. The uniform film thickness is crucial to the performance of the membrane, affecting the key parameters such as the filtration flux and retention rate of the membrane. The scraped glass plate is soaked in deionized water for 1-2 hours, which can exchange the solvent in the casting solution with water, promote the solidification of the polymer, and form a solid film with a certain pore structure. Rinse the membrane with deionized water in step S7 to remove residual solvents, unreacted impurities and possible adsorbed pollutants on the membrane surface to ensure the cleanliness of the membrane. Dry at 40-60°C for 12-24 hours to allow the water in the membrane to evaporate slowly and fully, avoiding structural deformation or stress of the membrane due to excessive temperature or too fast drying, thereby stabilizing the physical and chemical properties of the membrane; The dried membrane is cut by a membrane cutter in step S8. The membrane material can be accurately cut according to the design size and shape requirements of the filter element, ensuring the size accuracy of the filter element, meeting the requirements of filter element specifications in different application scenarios, and ensuring the assembly accuracy and filtration performance of the filter element.

[0030] In S3, the stirrer is a magnetic stirrer, and the rotation speed of the magnetic stirrer is controlled at 300-600 rpm.

[0031] Specifically, the polyethersulfone and polyvinylidene fluoride can obtain sufficient stirring force in N-methylpyrrolidone, promote the full contact and interaction between the polymer molecules and the solvent molecules, accelerate the dissolution rate of the polymer, and improve the preparation efficiency. At the same time, it can effectively overcome the gravity sedimentation of the polymer molecules and the density difference of each component in the solution, prevent the polymer from precipitating or stratifying during the dissolution process, and maintain the stability and uniformity of the solution.

[0032] In S5, the pressure of the vacuum drying oven is controlled at -0.08 MPa to -0.1 MPa.

[0033] Specifically, this can significantly reduce the air pressure in the drying box, causing a large pressure difference inside and outside the bubbles in the casting liquid. The bubbles will expand rapidly and escape from the casting liquid. At the same time, this pressure range can ensure effective degassing without causing the pressure in the box to be too low, resulting in excessive volatilization of the solvent.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel filter element with sewage oil separation function, comprising a membrane head (1), characterized in that: The inner wall of the membrane head (1) is provided with a super-tough adhesive tape (3), and a membrane thread (2) is provided inside the super-tough adhesive tape (3). The membrane thread (2) is bent near the center end so that both ends are close to form a U shape. Both ends of the membrane thread (2) face the membrane head (1), and the end plane of the membrane thread (2) is flush with the plane of the side of the membrane head (1) away from the membrane thread (2). A filter hole (4) is opened in the middle of the membrane thread (2), and the filter hole (4) passes through the center of the membrane thread (2). The outer wall of the membrane thread (2) is provided with a polymer mesh (5), and the upper part of the polymer mesh (5) is fixedly connected to the bottom of the membrane head (1).

2. The novel filter element with sewage oil separation function according to claim 1 is characterized by: The membrane filament (2) comprises the following raw materials in parts by weight: 70-95 parts of a polymer matrix, 5-20 parts of a nano additive, 10-25 parts of polyethylene glycol, and 50-200 parts of N-methylpyrrolidone.

3. The novel filter element with sewage oil separation function according to claim 2 is characterized by: The polymer matrix comprises the following raw materials in parts by weight: 35-65 parts of polyethersulfone and 15-50 parts of polyvinylidene fluoride.

4. The novel filter element with sewage oil separation function according to claim 2 is characterized by: The nano additive comprises the following raw materials in parts by weight: 3-10 parts of nano titanium dioxide and 2-10 parts of nano silver particles.

5. A novel filter element with sewage oil separation function according to any one of claims 1 to 4, characterized in that: The method for preparing the membrane filament (2) comprises the following steps: S1. Raw material preparation: weigh each component raw material according to the formula; S2, nanomaterial dispersion: adding weighed nano titanium dioxide and nano silver particles to N-methyl pyrrolidone, wherein the N-methyl pyrrolidone is 20%-30% of the total amount, and using an ultrasonic disperser to perform ultrasonic treatment on the mixed solution for about 30-60 minutes to form a nano additive solution; S3, polymer dissolution: adding polyethersulfone and polyvinylidene fluoride to N-methylpyrrolidone, wherein the N-methylpyrrolidone accounts for 70%-80% of the total amount, turning on the stirrer, heating to 60-80° C. on a heating device, and continuously stirring for 3-6 hours to form a polymer solution; S4, preparation of mixed solution: adding the nano-additive solution to the polymer solution while continuously stirring, then adding polyethylene glycol, and continuing stirring for 2-4 hours to form a casting solution; S5, degassing treatment: put the casting solution into a vacuum drying oven and degas for 30-60 minutes; S6, film preparation: pour the degassed casting solution onto a glass plate, use a scraper to scrape the film at a uniform speed, control the film thickness to be 100-300 microns, and then soak the scraped glass plate in deionized water for 1-2 hours; S7. Cleaning and drying of the membrane: remove the soaked membrane from the glass plate, rinse with deionized water, and then put the cleaned membrane into a drying oven, control the temperature of the drying oven at 40-60°C for 12-24 hours; S8, filter element molding: use a film cutting machine to cut the dried film.

6. The novel filter element with sewage oil separation function according to claim 5 is characterized by: In S2, the ultrasonic treatment uses an ultrasonic cleaner, controls the ultrasonic frequency to be between 20kHz and 80kHz, controls the ultrasonic power to be between 100W and 1000W, controls the ultrasonic time to be between 5min and 30min, and controls the ultrasonic temperature to be between 30°C and 60°C.

7. The novel filter element with sewage oil separation function according to claim 5 is characterized by: In S3, the stirrer is a magnetic stirrer, and the rotation speed of the magnetic stirrer is controlled to be 300-600 rpm.

8. The novel filter element with sewage oil separation function according to claim 5 is characterized by: In S5, the pressure of the vacuum drying oven is controlled at -0.08 MPa to -0.1 MPa.

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