Efficient separation device for treating oily sewage and working method

Abstract

The invention discloses an efficient separation device for treating oily sewage and a working method, the efficient separation device comprises a tubular membrane separation device, the tubular membrane separation device comprises a horizontally arranged membrane separation tube, a micro-filtration membrane is horizontally arranged in the membrane separation tube, the membrane separation tube is divided into an upper space and a lower space by the micro-filtration membrane, the upper space is provided with a high-oil-content outlet and a sewage inlet, and the lower space is provided with a high-oil-content outlet and a sewage outlet; a low-oil-content outlet is formed in the lower space; the air floatation oil removal tank comprises a tank body, a first weir plate and a second weir plate which are vertically arranged are arranged in the tank body, the first weir plate and the second weir plate divide the inner space of the tank body into an air floatation section, a stabilizing section and a slag collecting section, a diffuser is arranged in the air floatation section, a high-oil-content outlet is communicated with the stabilizing section through a pipeline, and the slag collecting section is communicated with the stabilizing section through a pipeline. The low-oil-content outlet is communicated with the air floatation section through a pipeline; a slag scraper is arranged at the upper part in the tank body; the device can realize efficient treatment of complex oily sewage, and has the advantages of high separation efficiency, good separation effect, compact structure, stable operation, convenience in maintenance and the like.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a high-efficiency separation device and its working method for treating oily wastewater. Background Technology

[0002] Air flotation technology is widely used in the treatment of oily wastewater, especially in the petroleum, chemical, and food processing industries. The principle of air flotation is to use microbubbles to bring oil droplets and suspended solids to the water surface, achieving oil-water separation. Modern air flotation technology can effectively remove tiny oil droplets and suspended solids, and the equipment is highly automated. Various air flotation technologies have been developed to address different water qualities and treatment needs, reducing the use of chemical reagents and lowering the risk of secondary pollution.

[0003] However, current methods for treating oily wastewater using only air flotation technology have some unresolved technical limitations, particularly in treating high-concentration, complex wastewater. Specifically, these limitations include: First, existing air flotation technology is not adaptable to high-concentration oily wastewater. When the oil concentration in the wastewater is high, the microbubbles in traditional air flotation units easily combine with excess oil droplets to form large scum, exacerbating bubble aggregation and reducing flotation efficiency. Furthermore, high oil concentrations can clog the pores of the aeration diffuser, reducing effective bubble generation and increasing system maintenance frequency. Second, its effectiveness in treating complex water qualities (such as systems with coexisting emulsified oil and suspended solids) is limited. Traditional air flotation technology relies on physical flotation, which has a weak ability to capture emulsified oil and small suspended solids. In addition, existing air flotation oil-water separation devices lack integration and flexibility. Most wastewater treatment equipment uses a fixed structure, making it difficult to adjust according to changes in site space or water quality. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a high-efficiency separation device and working method for treating oily wastewater, which can achieve efficient treatment of complex oily wastewater and has the advantages of high separation efficiency, good separation effect, compact structure, stable operation and convenient maintenance. The technical solution of the present invention is as follows: In a first aspect of the present invention, a high-efficiency separation device for treating oily wastewater is provided, comprising: A tubular membrane separation device includes a horizontally arranged membrane separation tube, in which a microfiltration membrane is horizontally arranged. The microfiltration membrane divides the membrane separation tube into upper and lower spaces, wherein the upper space is provided with a high oil content outlet and a wastewater inlet, and the lower space is provided with a low oil content outlet. An air flotation oil removal tank includes a tank body. A first weir plate and a second weir plate are vertically arranged inside the tank body. The first weir plate and the second weir plate divide the internal space of the tank body into an air flotation section, a stabilization section and a slag collection section. A diffuser is installed in the air flotation section. The high oil content outlet is connected to the stabilization section through a pipeline, and the low oil content outlet is connected to the air flotation section through a pipeline. A slag scraper is installed at the top inside the tank body.

[0005] In some embodiments of the present invention, the first weir plate and the second weir plate are separated by a set distance, the space between the first weir plate and the second weir plate is a stable section, the bottom of the tank body of the stable section is provided with an outlet, and the middle of the tank body is provided with a stable section inlet.

[0006] In some embodiments of the present invention, an anti-vortex plate is provided at the water outlet, and the inlet of the stabilization section is connected to the high oil content outlet via a pipeline.

[0007] In some embodiments of the present invention, the tank of the air flotation section is provided with an air flotation section inlet and a diffuser inlet. The air flotation section inlet is connected to a low oil content outlet through a pipe, and the diffuser inlet is connected to a diffuser through a pipe. Compressed air is introduced into the diffuser inlet.

[0008] In some embodiments of the present invention, the height of the upper edge of the first weir plate is the same as the height of the upper edge of the second weir plate, and the height of the lower edge of the first weir plate is higher than the height of the lower edge of the second weir plate, so that the bottom of the air flotation section and the stabilization section are connected. In some embodiments of the present invention, the height of the upper edge of the slag scraper is consistent with the height of the upper edge of the first weir plate and the second weir plate, and the slag scraper covers the flotation section, the stabilization section and the slag collection section. In some embodiments of the present invention, the bottom of the tank of the slag collection section is provided with a slag outlet, which is connected to a reduced diameter pipe; a safety valve interface is provided at the top of the tank of the slag collection section.

[0009] In some embodiments of the present invention, valves are provided on the pipeline connecting the high oil content outlet to the air flotation section and on the pipeline connecting the low oil content outlet to the stabilization section.

[0010] In some embodiments of the present invention, the surfaces of the microfiltration membrane and the diffuser are both subjected to hydrophilic and oleophobic modification treatment.

[0011] In a second aspect of the invention, a method for operating a high-efficiency separation device for treating oily wastewater is provided, comprising: Complex oily wastewater enters the membrane separation tube. After passing through the microfiltration membrane, water and small oil droplets enter the lower space of the membrane separation tube and flow out through the low oil content outlet. The remaining high oil content wastewater in the upper space of the microfiltration membrane flows out through the high oil content outlet. In this process, wastewater with low oil content enters the flotation section of the flotation oil removal tank. The diffuser generates bubbles that adsorb small oil droplets in the wastewater and carry them to the top scum layer. Wastewater with high oil content enters the stabilization section of the flotation oil removal tank. In the stabilization section, large oil clumps quickly float to the top scum layer. The scum scraper rotates counterclockwise to scrape the scum from the top of the flotation and stabilization sections into the scum collection section. The water phase from the flotation and stabilization sections flows out through the bottom outlet, and the oil scum from the scum collection section is discharged through the scum outlet. One or more technical solutions of the present invention have the following beneficial effects: (1) The present invention performs preliminary separation of complex oily wastewater by setting a tubular membrane separation device at the inlet of the air flotation oil removal tank. The high oily wastewater in the upper part of the tubular membrane separation device enters the stabilization section of the air flotation oil removal tank. The high-concentration oil clumps are quickly separated in the stabilization section of the tank and float to the oil sludge layer. The low oily wastewater in the lower part of the tubular membrane separation device enters the air flotation section of the oil removal tank. Under the adsorption of microbubbles, the oil droplets in the wastewater are carried to the oil sludge layer. The sludge scraper in the tank rotates counterclockwise to scrape the oil sludge in the air flotation section and the oil sludge in the stabilization section into the sludge collection section, thus completing the efficient treatment of complex oily wastewater. It has the advantages of high separation efficiency, good separation effect, compact structure, stable operation and convenient maintenance.

[0012] (2) In view of the problems that the air flotation technology for treating wastewater has difficulties in treating high-concentration wastewater and poor treatment effect of complex wastewater, the present invention combines tubular membrane separation technology with air flotation oil removal tank. The tubular membrane separation section transports small-volume oil droplets to the air flotation section and large-volume oil phase to the stabilization section (gravity separation section), which plays a role in oil-water pre-separation, reduces the operating load of the air flotation section, prevents diffuser blockage, and improves oil removal efficiency, thereby realizing segmented synergistic and efficient treatment of complex wastewater with high oil content.

[0013] (3) Traditional membrane separation equipment is large in size and the separation membrane is located inside the equipment, making installation and maintenance difficult. This invention places the tubular membrane separation structure outside the tank, which can be adjusted according to the on-site installation needs, and can be in the form of a straight line, S-shape, etc. It is small in size, flexible in structure, and convenient for installation and maintenance. It can work in conjunction with the air flotation oil removal tank, or it can be applied alone to the upstream of existing sewage treatment equipment to improve the overall separation efficiency.

[0014] (4) When the air flotation oil removal tank of the present invention is running, the diffuser in the air flotation section generates a large number of bubbles, which adsorb small oil droplets and carry them to the top scum layer. Under the action of gravity, the large oil clumps in the stabilization section gather and float to the top scum layer. The scum scraper scrapes the top scum off to the scum collection section. The bottom water layer of the air flotation section and the bottom water layer of the stabilization section are connected through the bottom water flow channel of the first weir plate and flow out from the bottom outlet, realizing the segmented and coordinated treatment of oily wastewater. The equipment operates more stably and the effect is better. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the high-efficiency separation device for treating oily wastewater according to the present invention.

[0016] In the diagram: 1. Wastewater inlet; 2. Membrane separation pipe; 3. Microfiltration membrane; 4. Sludge outlet; 5. Water outlet; 6. First weir plate; 7. High oil content outlet; 8. Low oil content outlet; 9. High oil content outlet valve; 10. Low oil content outlet valve; 11. Diffuser; 12. Flotation section inlet; 13. Diffuser inlet; 14. Flotation oil removal tank; 15. Sludge scraper; 16. Safety valve interface; 17. Second weir plate; 18. Stabilization section inlet. Detailed Implementation

[0017] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is intended to include the plural form as well. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] Example 1 In a typical embodiment of the present invention, a high-efficiency separation device for treating oily wastewater is proposed, such as... Figure 1 As shown, it includes: A tubular membrane separation device includes a horizontally arranged membrane separation tube 2, in which a microfiltration membrane 3 is horizontally arranged. The microfiltration membrane 3 divides the membrane separation tube 2 into upper and lower spaces, wherein the upper space is provided with a high oil content outlet 7 and a wastewater inlet 1, and the lower space is provided with a low oil content outlet. The air flotation oil removal tank 14 includes a tank body. A first weir plate 6 and a second weir plate 17 are vertically arranged inside the tank body. The first weir plate 6 and the second weir plate 17 divide the internal space of the tank body into an air flotation section, a stabilization section and a slag collection section. A diffuser 11 is installed in the air flotation section. The high oil content outlet 7 is connected to the stabilization section through a pipeline, and the low oil content outlet is connected to the air flotation section through a pipeline. A slag scraper 15 is installed at the top inside the tank body.

[0020] The aforementioned high-efficiency separation device, through the synergistic design of a tubular membrane separator and an air flotation oil removal tank 14, achieves graded and efficient treatment of oily wastewater. The tubular membrane separator uses horizontally arranged microfiltration membranes 3 to initially separate the wastewater into high-oil-content and low-oil-content sections, which are then introduced into the stabilization section and the air flotation section, respectively, effectively solving the problem of poor adaptability of traditional air flotation technology to high-concentration wastewater. The air flotation oil removal tank 14, through its partitioned design of the first weir plate 6 and the second weir plate 17, integrates air flotation, stabilization, and slag collection functions, significantly improving treatment efficiency and stability. The slag scraper 15 enables automatic removal of slag, reducing manual intervention and lowering operating costs. This device has a compact structure, is suitable for treating high-concentration oily wastewater from oil fields, and has advantages such as high separation efficiency, simple operation, and convenient maintenance.

[0021] In this embodiment, the first weir plate 6 and the second weir plate 17 are separated by a set distance, and the space between the first weir plate 6 and the second weir plate 17 is a stable section. The bottom of the tank in the stable section is provided with an outlet 5, and the middle of the tank is provided with a stable section inlet 18.

[0022] By setting a stabilizing section between the first weir plate 6 and the second weir plate 17, and configuring the outlet 5 and the stabilizing section inlet 18 at its bottom, natural flow and balance of the water phase in the flotation section and the stabilizing section are achieved. The setting of the stabilizing section allows large-volume oil clumps to float rapidly under the action of gravity, reducing the burden carried by air bubbles and improving oil-water separation efficiency. The reasonable layout of the outlet 5 ensures the stability of the treated water quality and avoids the formation of local dead water zones.

[0023] Furthermore, an anti-vortex plate is installed at the outlet 5, and the stabilization section inlet 18 is connected to the high oil content outlet via a pipeline. The anti-vortex plate at outlet 5 effectively prevents vortices from forming during water discharge, avoiding oil droplets being carried out with the water flow and improving the quality of the discharged water. The pipeline connection between the stabilization section inlet 18 and the high oil content outlet ensures that high oil content wastewater enters the stabilization section smoothly, reducing disturbance to the scum layer inside the tank. The anti-vortex plate design also reduces energy loss and improves the economic efficiency of system operation. This structure further enhances the stability and reliability of the device, making it suitable for long-term continuous operation.

[0024] In this embodiment, the flotation section tank is equipped with a flotation section inlet 12 and a diffuser inlet 13. The flotation section inlet 12 is connected to the low oil content outlet via a pipe, and the diffuser inlet 13 is connected to the diffuser 11 via a pipe. Compressed air is introduced through the diffuser inlet 13. The flotation section adopts a microporous aeration flotation method. Compressed air enters through the diffuser inlet 13, and microbubbles are generated by the diffuser 11. This microbubble aeration flotation method is simple and easy to implement and does not produce secondary shear. The connection between the flotation section inlet 12 and the low oil content outlet, as well as the design of introducing compressed air through the diffuser inlet 13, achieves efficient generation and uniform distribution of microbubbles. The diffuser 11 converts compressed air into microbubbles, enhancing the adsorption and flotation effect of oil droplets, improving the processing efficiency of the flotation section, avoiding the problem of easy clogging in traditional aeration devices, and reducing the maintenance frequency. The efficient operation of the flotation section reduces the load on subsequent processing units and improves the overall performance of the device.

[0025] In this embodiment, the height of the upper edge of the first weir plate 6 is the same as the height of the upper edge of the second weir plate 17, and the height of the lower edge of the first weir plate 6 is higher than the height of the lower edge of the second weir plate 17, so that the bottoms of the flotation section and the stabilization section are connected. The height design of the first weir plate 6 and the second weir plate 17 realizes the connection between the bottoms of the flotation section and the stabilization section, ensuring the natural flow and pressure balance of the water phase.

[0026] In this embodiment, the height of the upper edge of the scraper 15 is consistent with the height of the upper edges of the first weir plate 6 and the second weir plate 17, and the scraper 15 covers the flotation section, the stabilization section, and the slag collection section. The height and coverage of the scraper 15 enable it to effectively remove slag from the flotation section, the stabilization section, and the slag collection section, preventing slag accumulation from affecting the treatment effect. The counter-clockwise drive of the scraper 15 optimizes the guidance and collection of slag, improving slag discharge efficiency. This design reduces the need for manual cleaning and lowers operating costs.

[0027] In this embodiment, a slag outlet 4 is provided at the bottom of the slag collection section tank, and the slag outlet 4 is connected to a reduced-diameter pipe; a safety valve interface 16 is provided at the top of the slag collection section tank. The slag outlet 4 at the bottom of the slag collection section adopts a reduced-diameter pipe design, which accelerates the collection and discharge of slag, reduces dead space, and improves slag discharge efficiency. The safety valve interface 16 enhances the safety of the system and avoids equipment damage caused by abnormal pressure.

[0028] In this embodiment, valves are installed on both the pipe connecting the high oil content outlet 7 to the stabilization section and the pipe connecting the low oil content outlet to the flotation section. Specifically, a high oil content outlet valve is installed on the pipe connecting the high oil content outlet 7 to the stabilization section, and a low oil content outlet valve is installed on the pipe connecting the low oil content outlet to the flotation section. This valve installation allows for precise flow regulation, enabling the device to flexibly adapt to different water qualities and treatment requirements. Valve control optimizes the distribution of wastewater in the flotation and stabilization sections, improving the stability of the treatment effect.

[0029] In this embodiment, the surfaces of both the microfiltration membrane 3 and the diffuser 11 undergo hydrophilic-oleophobic modification treatment. This modification significantly reduces the risk of membrane fouling and clogging, extending the lifespan of the equipment. The modification treatment improves the permeation efficiency of the microfiltration membrane 3 and the bubble generation capacity of the diffuser 11, enhancing the overall treatment effect of the device. This design reduces the frequency of chemical cleaning, lowers maintenance costs, and is suitable for long-term, high-load operation.

[0030] In one specific implementation of this embodiment, such as Figure 1 As shown, the air flotation oil removal tank 14 is horizontal, the membrane separation tube 2 is arranged horizontally, and the microfiltration membrane 3 is arranged horizontally inside the membrane separation tube 2. The wastewater inlet 1 is located on the right side of the membrane separation tube 2, connecting to the upper side of the microfiltration membrane 3. The high oil content outlet 7 is located on the upper left side of the membrane separation tube 2, and the low oil content outlet of the tubular membrane separation section is located on the lower left side of the membrane separation tube 2. When complex oily wastewater enters the membrane separation tube 2 through the wastewater inlet 1, the oily wastewater permeates through the microfiltration membrane 3. Water and small oil droplets enter the bottom space of the membrane separation tube 2 and flow out through the low oil content outlet of the tubular membrane separation section. The remaining high oil content wastewater in the upper space of the microfiltration membrane 3 flows out through the high oil content outlet 7 of the tubular membrane separation section.

[0031] Furthermore, the flotation section inlet 12 is located in the lower left part of the flotation oil removal tank 14, and a low oil content outlet valve is provided in front of the flotation section inlet 12. The stabilization section inlet 18 is located in the middle front part of the oil removal tank, and a high oil content outlet valve is provided in front of the stabilization section inlet 18. The diffuser inlet 13 is located in the middle rear part of the oil removal tank. The diffuser 11 is located inside the oil removal tank on the left side and connected to the diffuser inlet 13. The slag scraper 15 is located at the top inside the oil removal tank. Inside the oil removal tank, a first weir plate 6 and a second weir plate 17 are arranged sequentially on the right side of the diffuser 11. A water outlet 5 is provided between the first weir plate 6 and the second weir plate 17. A slag outlet 4 is provided at the bottom right side of the second weir plate 17. A safety valve interface 16 is provided at the top right side of the second weir plate 17. Low-oil-content wastewater, after its flow rate is regulated by the low-oil-content outlet valve, enters the flotation section through inlet 12. The diffuser 11 generates bubbles that adsorb small oil droplets in the low-oil-content wastewater and carry them to the top scum layer. High-oil-content wastewater, after its flow rate is regulated by the high-oil-content outlet valve, enters the stabilization section through inlet 18. In the stabilization section, large oil clumps quickly float to the top scum layer. The scraper 15 rotates counterclockwise to scrape the scum from the top of the flotation and stabilization sections into the scum collection section. The water phase from the flotation and stabilization sections flows out through the bottom outlet 5, and the oil scum from the scum collection section is discharged through the scum outlet 4.

[0032] Furthermore, the upper and lower edges of the first weir plate 6 are both flat, and the upper edge of the second weir plate 17 is flat, while the lower edge is an arc-shaped surface that matches the shape of the tank body. This allows for bottom connection between the flotation section and the stabilization section, with the water flowing out through the outlet 5, separating the stabilization section from the slag collection section. The lower edge of the scraper 15 is at the same height as the weir plate. The left side of the scraper 15 extends to the left side of the aerator, and the right side extends to the right side of the second weir plate 17 and the left side of the safety valve interface 16. The scraper 15 rotates counterclockwise to scrape the scum from the top of the flotation section and the stabilization section to the left into the slag collection section. The top of the outlet 5 is equipped with an anti-vortex plate, and the slag outlet 4 has a narrow-diameter pipe structure. The slag outlet 4 has a larger contact diameter with the tank wall, which is beneficial for the collection and discharge of oil sludge, reduces the dead zone space in the slag collection chamber, and improves the slag discharge efficiency.

[0033] It should be noted that the microfiltration membrane 3, membrane separation tube 2, and diffuser 11 in this embodiment all adopt existing structures. The membrane treatment principle involves applying pressure to one side of the membrane, causing wastewater components to pass through the selective pores of the membrane, achieving oil-water separation. This method offers good separation effect and high separation accuracy, but when treating complex oily wastewater, the risk of membrane fouling and clogging is high, resulting in high maintenance costs. This embodiment proposes using tubular membrane separation technology for the pretreatment of complex oily wastewater. The membrane has a large pore size, is less prone to fouling, and can extend the membrane's service life. The microfiltration membrane 3 material can be a ceramic membrane with high mechanical strength, high temperature resistance, and chemical corrosion resistance, such as alumina, zirconium oxide, or titanium dioxide. Alternatively, hydrophilically modified organic polymer materials can be used, such as modified polyvinylidene fluoride or modified polyacrylonitrile. Using surface-modified membrane materials can improve the permeation efficiency of the microfiltration membrane 3 and extend its service life. The membrane separation tube 2 can be structurally adjusted according to on-site installation requirements, taking the form of a straight line, S-shape, etc., to facilitate on-site installation and maintenance. The diffuser 11 can be made of oleophobic modified materials, such as PTFE-coated ceramic, to prevent micropore clogging and improve air flotation separation efficiency. The tubular membrane separation section can be used in conjunction with the air flotation oil removal tank 14, or it can be used independently upstream of on-site oil removal equipment.

[0034] Example 2 In a typical embodiment of the present invention, a method for operating a high-efficiency separation device for treating oily wastewater is provided, comprising: Complex oily wastewater enters the membrane separation tube. After passing through the microfiltration membrane, water and small oil droplets enter the lower space of the membrane separation tube and flow out through the low oil content outlet. The remaining high oil content wastewater in the upper space of the microfiltration membrane flows out through the high oil content outlet. In this process, wastewater with low oil content enters the flotation section of the flotation oil removal tank. The diffuser generates bubbles that adsorb small oil droplets in the wastewater and carry them to the top scum layer. Wastewater with high oil content enters the stabilization section of the flotation oil removal tank. In the stabilization section, large oil clumps quickly float to the top scum layer. The scum scraper rotates counterclockwise to scrape the scum from the top of the flotation and stabilization sections into the scum collection section. The water phase from the flotation and stabilization sections flows out through the bottom outlet, and the oil scum from the scum collection section is discharged through the scum outlet.

[0035] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A high-efficiency separation device for treating oily sewage, characterized in that, The application relates to a tubular membrane separation device and a gas float oil removal tank. The tubular membrane separation device comprises horizontally arranged membrane separation tubes, microfiltration membranes horizontally arranged in the membrane separation tubes, a high-oil-content outlet and a sewage inlet arranged in an upper space of the membrane separation tubes, and a low-oil-content outlet arranged in a lower space of the membrane separation tubes. The gas float oil removal tank comprises a tank body, a first weir plate and a second weir plate vertically arranged in the tank body, a gas float section, a stabilizing section and a residue collecting section formed by the first weir plate and the second weir plate, a diffuser arranged in the gas float section, a pipeline connecting the high-oil-content outlet and the stabilizing section, and a pipeline connecting the low-oil-content outlet and the gas float section.

2. The high-efficiency separation device for treating oily sewage according to claim 1, wherein The first weir plate and the second weir plate are separated by a certain distance, and the space between the first weir plate and the second weir plate is the stabilizing section.

3. The high-efficiency separation device for treating oily sewage according to claim 2, wherein The tank body of the stabilizing section is provided with a water outlet at the bottom and a stabilizing section inlet at the middle.

4. The high efficiency separation device for treating oily water as claimed in claim 1, wherein, A vortex prevention plate is arranged at the water outlet, and the stabilizing section inlet is connected with the high-oil-content outlet through a pipeline.

5. The high efficiency separation device for treating oily water as claimed in claim 1, wherein, The tank body of the gas float section is provided with a gas float section inlet and a diffuser inlet.

6. The high efficiency separation device for treating oily water as claimed in claim 1, wherein, The height of the upper edge of the first weir plate is the same as that of the upper edge of the second weir plate, and the height of the lower edge of the first weir plate is higher than that of the lower edge of the second weir plate.

7. The high efficiency separation device for treating oily water as claimed in claim 1, wherein, The height of the upper edge of the residue scraper is the same as that of the upper edges of the first weir plate and the second weir plate, and the residue scraper covers the gas float section, the stabilizing section and the residue collecting section.

8. The high efficiency separation device for treating oily water as claimed in claim 1, wherein, The tank body of the residue collecting section is provided with a residue outlet connected with a reduced-diameter pipe, and the tank body of the residue collecting section is provided with a safety valve interface at the top.

9. The high efficiency separation device for treating oily water as claimed in claim 1, wherein, Valves are arranged on the pipelines connecting the high-oil-content outlet and the gas float section and the pipelines connecting the low-oil-content outlet and the stabilizing section.

10. The working method of the high-efficiency separation device for treating oily sewage according to any one of claims 1-9, characterized in that, The surfaces of the microfiltration membranes and the diffuser are subjected to hydrophilic and oleophobic modification treatment. The complex oil-containing sewage enters the membrane separation tube, and the water and small oil droplets penetrate the microfiltration membranes to enter the lower space of the membrane separation tube and flow out through the low-oil-content outlet. The low-oil-content sewage enters the gas float section of the gas float oil removal tank, the diffuser generates bubbles to adsorb and carry the small oil droplets in the low-oil-content sewage to the top scum layer, the high-oil-content sewage enters the stabilizing section of the gas float oil removal tank, and the large oil clusters in the stabilizing section quickly float to the top scum layer, the residue scraper is driven counterclockwise to scrape the scum at the top of the gas float section and the stabilizing section into the residue collecting section, the water in the gas float section and the stabilizing section flows out through the bottom water outlet, and the oil residue in the residue collecting section is discharged through the residue outlet.

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