Oil-water separation device based on biomimetic super-hydrophobic filter element

Abstract

This invention discloses an oil-water separation device based on a biomimetic superhydrophobic filter element, belonging to the technical field of oil-water separation equipment. It includes a main housing, a separation disc assembly, an oil scraping assembly, an oil collection assembly, a power transmission system, a liquid level monitoring assembly, an aeration and anti-sedimentation assembly, and a control system. The separation disc assembly adsorbs the oil phase and repels the water phase. The oil scraping assembly scrapes the oil phase adsorbed by the separation disc assembly and collects it in the oil collection assembly. The power transmission system drives the operation of the separation disc assembly. The aeration and anti-sedimentation assembly is located at the bottom of the main housing to slow down the deposition of silt, iron filings, and other impurities, and promotes the coalescence of tiny oil droplets. The control system controls the operation of each component. This invention places a SiO2 / PDMS composite biomimetic superhydrophobic filter element layer on the surface of multiple disc substrates. By driving the disc substrates to rotate at low speed, oil phase adsorption, lifting, scraping, and centralized collection are achieved. Automatic control and abnormal alarms are achieved through liquid level, pressure, and conductivity detection.

Description

Technical Field

[0001] This invention relates to the field of oil-water separation equipment technology, and in particular to an oil-water separation device based on a biomimetic superhydrophobic filter element. Background Technology

[0002] Large amounts of oily wastewater are generated during petrochemical, machining, transportation, and catering processes. When oil enters water bodies, it easily forms an oil film, hindering reoxygenation and potentially causing equipment blockage, increased sludge, and a heavier burden on subsequent treatment. Traditional oil-water separation methods, including gravity sedimentation, flotation, chemical flocculation, centrifugation, adsorption, and conventional membrane separation, while having a certain application base, often suffer from low separation efficiency, high energy consumption, high reagent consumption, membrane pore blockage, and insufficient stability during continuous operation when treating finely dispersed and emulsified oils.

[0003] Superhydrophobic / superoleophilic materials can achieve selective separation of oil and water phases by utilizing the wetting differences on the material surface. Biomimetic superhydrophobic films formed by SiO2 nanoparticles and PDMS composites possess low surface energy and a micro / nano rough structure, making it easy for the oil phase to wet or adhere, while the water phase struggles to spread or enter the pores, making them suitable for oil-water separation. However, relying solely on static filtration with a single material is insufficient to meet engineering requirements such as continuous processing, oil phase recovery, and operational status monitoring. Therefore, it is necessary to combine biomimetic superhydrophobic filter materials with a rotary separation structure, oil collection structure, power transmission structure, and automatic control system to form a compact, stable, and easy-to-maintain oil-water separation device. Summary of the Invention

[0004] The purpose of this invention is to provide an oil-water separation device based on a biomimetic superhydrophobic filter element. The SiO2 / PDMS composite biomimetic superhydrophobic filter element layer is disposed on the surface of multiple rotating disk substrates. The oil phase is adsorbed, lifted, scraped and collected by driving the rotating disk substrates to rotate at low speed. Automatic control and abnormal alarm are achieved by detecting liquid level, pressure and conductivity.

[0005] To achieve the above objectives, the present invention provides an oil-water separation device based on a biomimetic superhydrophobic filter element, comprising a main body, a separation turntable assembly, an oil scraping assembly, an oil collecting assembly, a power transmission system, a liquid level monitoring assembly, an aeration and anti-sedimentation assembly, and a control system; the separation turntable assembly, the oil scraping assembly, and the oil collecting assembly are all disposed inside the main body near the top. The separation disc assembly can adsorb the oil phase and repel the water phase. The oil scraping assembly can scrape the oil phase adsorbed by the separation disc assembly and collect it in the oil collection assembly. The power transmission system drives the operation of the separation disc assembly. The liquid level monitoring assembly is used to monitor the liquid level in the main tank. The aeration and anti-sedimentation assembly is set at the bottom of the main tank to slow down the deposition of mud, sand and iron filings and promote the aggregation of tiny oil droplets. The control system controls the operation of each component.

[0006] Preferably, the main body adopts a rectangular box structure, and the side walls of the main body are set as transparent side panels for observing liquid level changes, oil layer distribution and turntable operation status; the two side walls of the main body are respectively provided with water inlet and water outlet, and the bottom of the main body is provided with sewage outlet; the interior of the main body is divided into liquid inlet buffer zone, turntable separation zone, clean water discharge zone and bottom sewage discharge zone; after the oily wastewater enters through the water inlet, it flows slowly in the box and forms a relatively stable liquid level, the oil phase accumulates to the liquid surface due to its lower density, and the water phase is located at the bottom; Inside the main body of the tank, a filter basket is also attached by a support frame. The filter basket is close to the water inlet, and the liquid entering from the water inlet is first filtered by the filter basket.

[0007] Preferably, the separation turntable assembly includes a turntable base, a biomimetic superhydrophobic filter layer, and a drive shaft. Multiple turntable bases are uniformly fixedly connected to the drive shaft, and the outer surface of the turntable base is provided with a biomimetic superhydrophobic filter layer. The power transmission system includes a drive motor, a reduction gear set, and a bearing housing. The drive motor is fixed on the inner wall of the main body housing. The output shaft of the drive motor is connected to the reduction gear set, which is also connected to the transmission shaft. The two ends of the transmission shaft are rotatably connected in the bearing housing, which is fixed on the inner side wall of the main body housing.

[0008] Preferably, the biomimetic superhydrophobic filter layer is a SiO2 / PDMS composite porous film layer, wherein the SiO2 nanoparticles form a micro-nano rough structure and the PDMS forms a flexible support matrix.

[0009] Preferably, the oil scraping assembly includes an oil scraper, a guide plate, and a connecting plate. The connecting plate has multiple grooves evenly distributed, and the turntable base is located in the grooves. The number of turntable bases matches the number of grooves. Each turntable base has an oil scraper on both sides, and a guide plate is provided at each oil scraper position. Both the oil scraper and the guide plate are fixed to the connecting plate. Both the oil scraper and the guide plate are inclined downwards.

[0010] Preferably, the oil collection assembly includes an oil collection trough and an oil drain pipe. The oil collection trough is inclined downwards, and the top of the oil collection trough is integrally formed with the bottom of the connecting plate. Both the oil collection trough and the connecting plate are fixed to the inner wall of the main body. An oil drain pipe is provided on the side wall of the main body, and the inlet end of the oil drain pipe is adapted to the bottom end of the oil collection trough.

[0011] Preferably, the inner wall of the main body is fixed to the side of the first partition, and the top of the first partition is also fixed to the bottom of the oil collection tank. The first partition is vertically arranged. The bottom of the second partition is fixed to the bottom wall of the main body. The second partition is also vertically arranged. The first partition and the second partition are spaced apart. One first partition and one second partition form a group, and multiple groups of partition assemblies are evenly arranged inside the main body. The aeration and anti-sedimentation component includes multiple aeration discs, which are evenly arranged on the bottom wall inside the main body box. The aeration discs are also connected to an air pump. The aeration discs are located between the partition components or between the partition components and the inner wall of the main body box.

[0012] Preferably, the control system includes a controller and a pressure sensor, a conductivity sensor, a display and alarm module, a drain solenoid valve, and a water inlet solenoid valve electrically connected to the controller. The liquid level monitoring component includes an upper liquid level sensor and a lower liquid level sensor electrically connected to the controller. The controller controls water inlet, drainage, and alarm based on liquid level, pressure, and conductivity signals. The pressure sensor is arranged at the bottom of the main body or near the drainage channel to determine the bottom sedimentation or flow channel blockage.

[0013] Preferably, the SiO2 / PDMS composite porous film layer is prepared by 3D printing a micropillar array mold, spraying a release agent, casting a PDMS precursor, spreading SiO2 nanoparticles, roller pressing deposition with wool rollers, heat preservation curing, and demolding.

[0014] Preferred methods include separation techniques, with the following steps: S1: Oily wastewater enters the main tank through the inlet and forms a stable liquid level inside the tank; S2: The drive motor drives the rotating base of the separation turntable assembly to rotate at a low speed, so that the biomimetic superhydrophobic filter element layer contacts the floating oil layer and adsorbs the oil phase. S3: The rotating substrate carries the adsorbed oil film away from the liquid surface, and the attached water flows back to the main body under the action of gravity; S4: The scraper blade of the oil scraping assembly scrapes off the oil film on the surface of the turntable base, and the oil enters the oil collection tank and is discharged through the oil drain pipe; S5: The control system controls the inlet solenoid valve, the outlet solenoid valve, and the display and alarm module based on liquid level, pressure, and conductivity signals. The advantages and positive effects of the oil-water separation device based on a biomimetic superhydrophobic filter element described in this invention are: (1) The biomimetic superhydrophobic filter element layer on the surface of the rotating disk substrate has water-repellent and oil-loving properties, which can improve the oil phase capture effect and reduce the water content; (2) Multiple rotating disk substrates rotate in parallel at low speed, which can continuously contact the floating oil layer on the liquid surface and improve the oil phase recovery capacity per unit time; (3) The oil scraper, guide plate, oil collection tank and oil discharge pipe are used together to realize timely scraping and centralized discharge of oil film; (4) The liquid level adjustment and aeration anti-sedimentation structure is conducive to maintaining a stable liquid level and reducing bottom blockage; (5) The control system can monitor the liquid level, pressure and conductivity in real time, and has the functions of inlet and outlet control, data display and abnormal alarm, which improves the safety and intelligence level of the device operation.

[0015] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an oil-water separation device based on a biomimetic superhydrophobic filter element, hidden behind the front wall of the main body box, according to the present invention. Figure 2 This is a schematic diagram from another perspective of an oil-water separation device based on a biomimetic superhydrophobic filter element according to the present invention; Figure 3 for Figure 1 The main view; Figure 4 This is a schematic diagram showing the connection between the separate turntable assembly and the power transmission system of the present invention; Figure 5 This is a schematic diagram of the oil scraping component of the present invention; Figure 6 This is a schematic diagram of the oil-water separation process of the present invention; Figure 7 This is a schematic diagram of the controller system of the present invention; Figure 8 The image shows the physical specimen and characterization diagram of the superoleophilic-superhydrophobic filter element of this invention. Figure 9 This is a schematic diagram of the preparation process of the biomimetic superoleophilic-superhydrophobic filter element of the present invention.

[0017] Figure Labels 1. Main body; 101. Water inlet; 102. Water outlet; 103. Sewage outlet; 104. Transparent side panel; 2. Separating turntable assembly; 201. Drive shaft; 202. Turntable base; 203. Bionic superhydrophobic filter layer; 3. Oil scraping assembly; 301. Oil scraper blade; 302. Deflector plate; 303. Connecting plate; 4. Oil collection assembly; 401. Oil collection tank; 402. Oil drain pipe; 5. Power transmission system; 501. Drive motor; 502. Reduction gear set; 503. Bearing housing; 6. Liquid level monitoring component; 601. Upper liquid level sensor; 602. Lower liquid level sensor; 603. Inlet solenoid valve; 7. Aeration and anti-sedimentation component; 701. Aeration disc; 8. Control system; 801. Controller; 802. Pressure sensor; 803. Conductivity sensor; 804. Display and alarm module; 805. Drain solenoid valve; 9. Partition 1; 10. Partition 2; 11. Filter basket. Detailed Implementation

[0018] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit the scope of this application.

[0020] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0021] like Figures 1-9 As shown, an oil-water separation device based on a biomimetic superhydrophobic filter element includes a main housing 1, a separation turntable assembly 2, an oil skimming assembly 3, an oil collecting assembly 4, a power transmission system 5, a liquid level monitoring assembly 6, an aeration and anti-sedimentation assembly 7, and a control system 8. The separation turntable assembly 2, the oil skimming assembly 3, and the oil collecting assembly 4 are all located inside the main housing 1 near the top.

[0022] The separating disc assembly 2 adsorbs the oil phase and repels the water phase. The oil scraping assembly 3 scrapes the oil phase adsorbed by the separating disc assembly 2 and collects it in the oil collecting assembly 4. The power transmission system 5 drives the operation of the separating disc assembly 2. The liquid level monitoring assembly 6 monitors the liquid level inside the main tank 1. The aeration and anti-sedimentation assembly 7 is located at the bottom inside the main tank 1 to slow down the deposition of silt, iron filings, and other impurities, and to promote the aggregation of tiny oil droplets. The control system 8 controls the operation of each component.

[0023] The main tank 1 adopts a rectangular tank structure, with transparent side panels 104 on its side walls for observing liquid level changes, oil layer distribution, and rotary table operation. Inlet 101 and outlet 102 are respectively located on the two side walls of the main tank 1, and drain 103 is located at the bottom. The interior of the main tank 1 is divided into an inlet buffer zone, a rotary table separation zone, a clean water discharge zone, and a bottom drain zone. Oily wastewater enters through inlet 101, flows slowly within the tank, and forms a relatively stable liquid level. The oil phase, due to its lower density, accumulates at the surface, while the water phase remains at the bottom.

[0024] Inside the main body 1, a filter basket 11 is also connected by a bracket. The filter basket 11 is close to the water inlet 101, and the liquid entering from the water inlet 101 is first filtered by the filter basket 11.

[0025] like Figure 5 As shown, the separation turntable assembly 2 includes a turntable base 202, a biomimetic superhydrophobic filter layer 203, and a drive shaft 201. Multiple turntable bases 202 are uniformly fixedly connected to the drive shaft 201, and the outer surface of the turntable base 202 is provided with a biomimetic superhydrophobic filter layer 203.

[0026] Specifically, during operation, the lower part of the rotating disk substrate 202 is immersed in the oil-water mixture, while the upper part is exposed above the liquid surface. When the surface of the rotating disk substrate 202 passes through the floating oil layer, the biomimetic superhydrophobic filter element layer 203 preferentially adsorbs the oil phase, while the water phase does not easily adhere to the rotating disk surface due to surface repulsion.

[0027] like Figure 4 As shown, the power transmission system 5 includes a drive motor 501, a reduction gear set 502, and a bearing housing 503. The drive motor 501 is fixed on the inner wall of the main body housing 1. The output shaft of the drive motor 501 is connected to the reduction gear set 502. The reduction gear set 502 is also connected to the transmission shaft 201. Both ends of the transmission shaft 201 are rotatably connected in the bearing housing 503. The bearing housing 503 is fixed on the inner side wall of the main body housing 1.

[0028] Specifically, the drive motor 501 drives the transmission shaft 201 to rotate through the reduction gear set 502, so that the turntable base 202 of the separation turntable assembly 2 maintains a low-speed synchronous rotation of 5r / min to 15r / min. The low-speed rotation can ensure that the turntable is in full contact with the floating oil layer, and can also reduce liquid surface disturbance and water carryover.

[0029] The biomimetic superhydrophobic filter layer 203 is a SiO2 / PDMS composite porous film layer, in which SiO2 nanoparticles form a micro-nano rough structure and PDMS forms a flexible support matrix.

[0030] like Figure 5 As shown, the oil scraping assembly 3 includes an oil scraper 301, a guide plate 302, and a connecting plate 303. Multiple grooves are evenly distributed on the connecting plate 303, and the turntable base 202 is located within these grooves, with the number of grooves matching the number of the turntable base 202. An oil scraper 301 is provided on both sides of each turntable base 202, and a guide plate 302 is provided at the position of each oil scraper 301. Both the oil scraper 301 and the guide plate 302 are fixed to the connecting plate 303. Both the oil scraper 301 and the guide plate 302 are inclined downwards.

[0031] Specifically, the oil scraper 301 is positioned close to the outer circumference of the turntable base 202. When the turntable, which adsorbs the oil film, rotates to the oil scraping area, the oil scraper 301 scrapes off the oil film. The guide plate 302 is arranged at an angle relative to the horizontal plane, allowing the oil to enter the oil collection tank 401 along the guiding direction.

[0032] The oil collecting assembly 4 includes an oil collecting trough 401 and an oil drain pipe 402. The oil collecting trough 401 is inclined downwards, and its top end is integrally formed with the bottom end of the connecting plate 303. Both the oil collecting trough 401 and the connecting plate 303 are fixed to the inner wall of the main body 1. The oil drain pipe 402 is provided on the side wall of the main body 1, and its inlet end is adapted to the bottom end of the oil collecting trough 401.

[0033] like Figure 3 As shown, the inner wall of the main body 1 is fixed to the side of partition 9, and the top of partition 9 is also fixed to the bottom of the oil collection tank 401. Partition 9 is vertically arranged. The bottom of partition 10 is fixed to the bottom wall of the main body 1. Partition 10 is also vertically arranged, and partitions 9 and 10 are spaced apart. One partition 9 and one partition 10 form a group, and multiple groups of partition assemblies are evenly arranged inside the main body 1.

[0034] The aeration and anti-sedimentation component 7 includes multiple aeration discs 701, which are evenly arranged on the bottom wall inside the main body 1. The aeration discs 701 are also connected to an air pump. The aeration discs 701 are located between the baffle assemblies or between the baffle assemblies and the inner wall of the main body 1.

[0035] like Figure 7As shown, the control system 8 includes a controller 801 and a pressure sensor 802, a conductivity sensor 803, a display and alarm module 804, a drain solenoid valve 805, and a water inlet solenoid valve 603, all electrically connected to the controller 801. The liquid level monitoring component 6 includes an upper liquid level sensor 601 and a lower liquid level sensor 602. The controller 801 controls water inlet, drainage, and alarm functions based on liquid level, pressure, and conductivity signals. The pressure sensor 802 is located at the bottom of the main body 1 or near the drainage channel to determine bottom sedimentation or channel blockage.

[0036] Specifically, when the liquid level is below the set lower limit, the control system 8 opens the water inlet solenoid valve 603. When the liquid level reaches the set upper limit, the control system 8 closes the water inlet solenoid valve 603, so that the lower part of the turntable base 202 remains stably immersed in the liquid surface while the upper part is exposed above the liquid surface.

[0037] Specifically, the conductivity sensor 803 is used to detect the state of the water after separation; the display and alarm module 804 is used to display the liquid level, pressure, conductivity, and fault information. When the pressure is too high, the liquid level is abnormal, or the conductivity exceeds the set range, the controller 801 activates an audible and visual alarm and closes or keeps the relevant valves closed according to the fault type.

[0038] Specifically, the controller 801 uses the STM32F103C8T6 model controller.

[0039] The SiO2 / PDMS composite porous film layer was prepared by 3D printing a micropillar array mold, spraying a release agent, casting a PDMS precursor, spreading SiO2 nanoparticles, roller pressing deposition with a wool roller, heat preservation curing, and demolding.

[0040] Specifically, one embodiment is as follows: Figure 9 As shown, a three-dimensional model of the micropillar array mold was first established, and then formed using DLP photopolymerization 3D printing followed by cleaning and post-processing. Next, a PDMS-specific release agent was sprayed onto the mold surface. The PDMS main agent and curing agent were mixed at a 10:1 mass ratio, degassed, and then poured onto the mold surface. Then, hydrophobic SiO2 nanoparticles were sprinkled on top and rolled using a wool roller to embed the nanoparticles into the uncured PDMS surface. Finally, the sample was placed in an environment of approximately 80℃ for heat preservation and curing. After cooling, it was demolded to obtain a SiO2 / PDMS composite porous film.

[0041] Specifically, such as Figure 8 As shown, Figure a is a physical image of the superoleophilic-superhydrophobic filter element, Figure b shows the state of different liquids on the superoleophilic-superhydrophobic filter element, Figure c shows the contact angle of water on the superoleophilic-superhydrophobic filter element, Figure d shows the contact angle of oil on the superoleophilic-superhydrophobic filter element, and Figure e shows the microstructure of water on the superoleophilic-superhydrophobic filter element.

[0042] This invention discloses a separation method for an oil-water separation device based on a biomimetic superhydrophobic filter element, comprising the following steps: S1: Allows oily wastewater to enter the main tank 1 through the inlet 101 and form a stable liquid level inside the tank.

[0043] S2: Drive motor 501 drives the turntable base 202 of the separation turntable assembly 2 to rotate at low speed, so that the biomimetic superhydrophobic filter element layer 203 contacts the floating oil layer and adsorbs the oil phase.

[0044] S3: The rotating substrate 202 carries the adsorbed oil film away from the liquid surface, and the attached water flows back to the main body box 1 under the action of gravity.

[0045] S4: The oil scraper 301 of the oil scraper assembly 3 scrapes off the oil film on the surface of the turntable base 202, and the oil enters the oil collection tank 401 and is discharged through the oil drain pipe 402.

[0046] S5: The control system 8 controls the inlet solenoid valve 603, the drain solenoid valve 805, and the display and alarm module 804 based on the liquid level, pressure, and conductivity signals.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. An oil-water separation device based on a biomimetic superhydrophobic filter element, characterized in that: It includes a main housing, a separating turntable assembly, an oil skimming assembly, an oil collecting assembly, a power transmission system, a liquid level monitoring assembly, an aeration and anti-sedimentation assembly, and a control system; the separating turntable assembly, the oil skimming assembly, and the oil collecting assembly are all located inside the main housing near the top. The separation disc assembly can adsorb the oil phase and repel the water phase. The oil scraping assembly can scrape the oil phase adsorbed by the separation disc assembly and collect it in the oil collection assembly. The power transmission system drives the operation of the separation disc assembly. The liquid level monitoring assembly is used to monitor the liquid level in the main tank. The aeration and anti-sedimentation assembly is set at the bottom of the main tank to slow down the deposition of mud, sand and iron filings and promote the aggregation of tiny oil droplets. The control system controls the operation of each component.

2. The oil-water separation device based on a biomimetic superhydrophobic filter element according to claim 1, characterized in that: The main body of the tank adopts a rectangular box structure, and the side walls of the main body are set as transparent side panels for observing liquid level changes, oil layer distribution and turntable operation status. The two side walls of the main body are respectively equipped with water inlets and outlets, and the bottom of the main body is equipped with a sewage outlet. The interior of the main body is divided into a liquid inlet buffer zone, a turntable separation zone, a clean water discharge zone and a bottom sewage discharge zone. After the oily wastewater enters through the water inlet, it flows slowly in the tank and forms a relatively stable liquid level. The oil phase, due to its lower density, accumulates on the liquid surface, while the water phase is located at the bottom. The interior of the main body is also equipped with a filter basket connected by a support frame. The filter basket is close to the water inlet, and the liquid entering from the water inlet is first filtered by the filter basket.

3. The oil-water separation device based on a biomimetic superhydrophobic filter element according to claim 2, characterized in that: The separation turntable assembly includes a turntable base, a biomimetic superhydrophobic filter layer, and a drive shaft. Multiple turntable bases are uniformly fixedly connected to the drive shaft, and a biomimetic superhydrophobic filter layer is provided on the outer surface of the turntable base. The power transmission system includes a drive motor, a reduction gear set, and a bearing housing. The drive motor is fixed on the inner wall of the main body housing. The output shaft of the drive motor is connected to the reduction gear set, which is also connected to the transmission shaft. The two ends of the transmission shaft are rotatably connected in the bearing housing, which is fixed on the inner side wall of the main body housing.

4. The oil-water separation device based on a biomimetic superhydrophobic filter element according to claim 3, characterized in that: The biomimetic superhydrophobic filter layer is a SiO2 / PDMS composite porous film layer, in which SiO2 nanoparticles form a micro-nano rough structure and PDMS forms a flexible support matrix.

5. The oil-water separation device based on a biomimetic superhydrophobic filter element according to claim 4, characterized in that: The oil scraping assembly includes an oil scraper, a guide plate, and a connecting plate. The connecting plate has multiple grooves evenly distributed, and the turntable base is located in the grooves. The number of turntable bases matches the number of grooves. Each turntable base has an oil scraper on both sides, and a guide plate is provided at each position of the oil scraper. Both the oil scraper and the guide plate are fixed to the connecting plate. Both the oil scraper and the guide plate are inclined downwards.

6. The oil-water separation device based on a biomimetic superhydrophobic filter element according to claim 5, characterized in that: The oil collection assembly includes an oil collection trough and an oil drain pipe. The oil collection trough is inclined downwards, and the top of the oil collection trough is integrally formed with the bottom of the connecting plate. Both the oil collection trough and the connecting plate are fixed to the inner wall of the main body. An oil drain pipe is installed on the side wall of the main body, and the inlet end of the oil drain pipe is adapted to the bottom end of the oil collection tank.

7. The oil-water separation device based on a biomimetic superhydrophobic filter element according to claim 6, characterized in that: The inner wall of the main body is fixed to the side of the first partition, and the top of the first partition is also fixed to the bottom of the oil collection tank. The first partition is set vertically. The bottom of the second partition is fixed to the bottom wall of the main body. The second partition is also set vertically. The first partition and the second partition are set at intervals. One first partition and one second partition form a group, and multiple groups of partition assemblies are evenly arranged inside the main body. The aeration and anti-sedimentation component includes multiple aeration discs, which are evenly arranged on the bottom wall inside the main body box. The aeration discs are also connected to an air pump. The aeration discs are located between the partition components or between the partition components and the inner wall of the main body box.

8. The oil-water separation device based on a biomimetic superhydrophobic filter element according to claim 7, characterized in that: The control system includes a controller and pressure sensors, conductivity sensors, display and alarm modules, drain solenoid valves and inlet solenoid valves electrically connected to the controller. The liquid level monitoring component includes upper liquid level sensors and lower liquid level sensors electrically connected to the controller. The controller controls water inlet, drainage and alarm based on liquid level, pressure and conductivity signals. The pressure sensor is arranged at the bottom of the main body or near the drainage channel to determine the bottom sediment or flow channel blockage.

9. An oil-water separation device based on a biomimetic superhydrophobic filter element according to claim 8, characterized in that: The SiO2 / PDMS composite porous film layer is prepared by 3D printing a micro-pillar array mold, spraying a release agent, casting a PDMS precursor, spreading SiO2 nanoparticles, roller pressing deposition with a wool roller, heat preservation curing, and demolding.

10. An oil-water separation device based on a biomimetic superhydrophobic filter element according to claim 9, characterized in that: The separation method includes the following steps: S1: Oily wastewater enters the main tank through the inlet and forms a stable liquid level inside the tank; S2: The drive motor drives the rotating base of the separation turntable assembly to rotate at a low speed, so that the biomimetic superhydrophobic filter element layer contacts the floating oil layer and adsorbs the oil phase. S3: The rotating substrate carries the adsorbed oil film away from the liquid surface, and the attached water flows back to the main body under the action of gravity; S4: The scraper blade of the oil scraping assembly scrapes off the oil film on the surface of the turntable base, and the oil enters the oil collection tank and is discharged through the oil drain pipe; S5: The control system controls the inlet solenoid valve, the drain solenoid valve, and the display and alarm module based on the liquid level, pressure, and conductivity signals.

Images