Oily sewage purification treatment device and method

Abstract

The invention provides an oily sewage purification treatment device and method, and belongs to the technical field of sewage treatment. Comprising a lower tank body and an upper tank body fixed above the lower tank body, an isolation cover is fixedly connected to the interior of the lower tank body, and a rectifying disc is fixedly connected to the interior of the isolation cover and used for rectifying rising sewage; a rotating main shaft is coaxially arranged in the upper tank body, a driving motor for driving the rotating main shaft is fixedly connected to the top of the upper tank body, a rotating disc group is fixedly connected to the outer side of the rotating main shaft, and oil in sewage is physically demulsified by shearing force generated when the rotating disc group rotates. Shear and turbulent flow can be applied to emulsified oil drops through the rotating disc set rotating at a high speed, efficient demulsification is achieved in a physical mode so as to guarantee conglomeration and collection of subsequent oil phases, the use cost of agents and the risk of chemical pollution can be reduced, and demulsified fluid directly enters the conical barrel to conduct rotational flow, so that the efficiency is improved. And the separation of an oil phase and a water phase is realized under the action of centrifugal force, so that the treatment effect on the oily sewage is ensured.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to an apparatus and method for purifying and treating oily wastewater. Background Technology

[0002] Industrial wastewater containing emulsified oil is generated during industrial production, fine processing, and modern cleaning processes. Currently, the treatment of such oily wastewater adopts a combination of processes including oil separation, chemical demulsification, air flotation, and filtration. This method is highly dependent on chemical agents, which not only leads to high treatment costs but also causes chemical pollution.

[0003] Existing physical separation equipment, such as centrifuges or hydrocyclones, can avoid the use of chemical reagents. However, centrifuges rely on high speed to generate centrifugal force for separation, which is effective for separating demulsified oil droplets. For stable emulsified oil, the centrifugal inertial force mainly acts on the entire oil droplet and does not directly act on the interfacial film on the surface of the oil droplet. This results in a limited demulsification effect on the emulsified oil, leading to poor subsequent oil phase aggregation and inconvenience for collection. Hydrocyclones, on the other hand, are not efficient at separating small oil droplets, which are discharged together with the aqueous phase, resulting in poor oil-water separation. Therefore, this application provides an oily wastewater purification and treatment device and method to meet the needs. Summary of the Invention

[0004] The purpose of this invention is to provide an oily wastewater purification and treatment device and method to solve the above-mentioned problems. By using a high-speed rotating disk assembly, shearing and turbulence can be applied to emulsified oil droplets, which can efficiently demulsify them physically to ensure the subsequent aggregation and collection of the oil phase. This solves the problems mentioned in the background art, such as the limited ability of centrifuges to demulsify stable emulsified oil, poor subsequent oil phase aggregation effect, and inconvenient collection, as well as the insufficient separation efficiency of hydrocyclones for small oil droplets, which result in small oil droplets being mixed in with the aqueous phase and discharged together, leading to poor oil-water separation effect.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: An oily wastewater purification and treatment device includes a lower tank and an upper tank fixed above it. An isolation hood is fixedly connected inside the lower tank, and a rectifier plate is fixedly connected inside the isolation hood for rectifying the rising wastewater. A rotating main shaft is coaxially arranged inside the upper tank, and a drive motor for driving the rotating main shaft is fixedly connected to the top of the upper tank. A rotating disk assembly is fixedly connected to the outside of the rotating main shaft. The shear force generated by the rotating disk assembly physically demulsifies the oil in the wastewater. A conical barrel is fixedly connected to the inner wall of the upper tank, outside the rotating disk assembly. A spiral guide vane is arranged on the inner wall of the conical barrel, and an oil collection hood is fixedly connected to the inner wall of the conical barrel for collecting oil at the center of the vortex. The rotating disk assembly can generate strong shear force to achieve efficient physical demulsification. With the cooperation of the conical barrel and the spiral guide vane, the demulsified wastewater can be tangentially rotated to separate oil and water under centrifugal force, improving the agglomeration effect of the oil phase and achieving separate collection and treatment of oil and water.

[0006] Optionally, the rotating disk assembly includes multiple disks coaxially spaced and fixed on a rotating main shaft, with gaps between adjacent disks; each disk consists of a main disk and spacer disks, with multiple arc-shaped plates fixedly connected at equal intervals between the main disk and the spacer disks; the main disk has multiple perforations at equal intervals inside, and the combination of arc-shaped plates and perforations can increase the turbulence and shear area of ​​the fluid, thereby enhancing the demulsification and oil droplet aggregation effects.

[0007] Optionally, the isolation cover is provided with a concave portion, and an acirculation portion is formed between the isolation cover and the lower tank. An upper row of holes is provided at equal intervals inside the isolation cover and located in the concave portion. Through the cooperation of the concave portion, the acirculation portion and the upper row of holes, the incoming water can form an initial vortex and guide the fluid to rise in an orderly manner, while assisting the wastewater to achieve primary separation of the oil phase, water phase and solid phase.

[0008] Optionally, the rectifier disk has equidistant flow guide gaps inside. The flow guide gaps are inclined and the bottom opening of the flow guide gap is larger than the top opening. The inclined and gradually narrowing flow guide gaps can effectively regulate the fluid state, eliminate turbulence, and accelerate and guide the fluid to enter the upper tank in a better state for processing.

[0009] Optionally, an adjusting ring is slidably connected to the outer wall of the conical barrel, and an electric push rod is symmetrically fixedly connected to the top of the upper tank. The telescopic end of the electric push rod extends into the interior of the upper tank and is fixedly connected to a connecting frame. The connecting frame is fixedly connected to the outer wall of the adjusting ring. The height of the adjusting ring at the top of the conical barrel can be adjusted according to the density of the oil phase to ensure that the oil collection hood can efficiently collect the oil phase in the sewage.

[0010] The treatment method for oily wastewater purification and treatment equipment includes the following steps: S1. Oily wastewater and auxiliary liquid are injected into the lower tank through the tangential inlet to form an initial vortex, and the wastewater is rectified and accelerated under the action of the rectifier plate; S2. The rectified fluid enters the rotating disk assembly and undergoes physical demulsification under the action of the high-speed rotating disk assembly. S3. The demulsified fluid is tangentially thrown into the conical barrel, where it forms a centrifugal vortex under the guidance of the spiral guide vanes, achieving centrifugal separation of oil and water. S4. The separated oil phase gathers in the center, enters the collection chamber of the oil collection hood through the drainage hole, and is then discharged. The water phase overflows into the still water area and is then discharged.

[0011] Compared with the prior art, the present invention has at least the following beneficial effects: In the above-mentioned scheme, the oily wastewater purification and treatment device provided in this application can apply shearing and turbulence to the emulsified oil droplets through a high-speed rotating disk assembly, which can efficiently demulsify the oil droplets in a physical manner to ensure the subsequent aggregation and collection of the oil phase. It can also reduce the cost of reagent use and the risk of chemical pollution. Moreover, the fluid after demulsification directly enters the conical barrel for swirling and achieves the separation of the oil phase and water phase under the action of centrifugal force, ensuring the treatment effect of oily wastewater. It is worth mentioning that the height of the adjusting ring at the top of the conical barrel can be adjusted according to the density of the oil phase, which can improve the collection effect of the oil phase. By installing an isolation cover inside the lower tank, sewage entering the lower tank can be blocked, preventing sewage from directly impacting the rising fluid in the middle and ensuring the rotation of the rising fluid. Under the action of the rectifier plate, the fluid can be rectified and accelerated, providing a stable and evenly distributed inflow for subsequent sewage treatment. Attached Figure Description

[0012] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0013] Figure 1 This is an overall schematic diagram of the oily wastewater purification and treatment device of the present invention; Figure 2 These are sectional views of the lower tank and the upper tank. Figure 3 This is a schematic diagram showing the connection between the lower tank and the isolation cover according to the present invention; Figure 4 This is a cross-sectional view of the isolation cover and rectifier disk of the present invention; Figure 5 This is a schematic diagram showing the connection between the rotating spindle and the rotating disk assembly of the present invention; Figure 6 This is a three-dimensional structural diagram of the disk of the present invention; Figure 7This is a schematic diagram showing the connection between the conical barrel and the adjusting ring of the present invention; Figure 8 This is a cross-sectional view of the oil collection cover of the present invention.

[0014] Figure label: 1. Lower tank; 101. Water inlet pipe; 102. Liquid inlet pipe; 2. Upper tank; 3. Isolation cover; 301. Circulation section; 302. Concave section; 3021. Upper row hole; 4. Rectifier plate; 401. Guide gap; 5. Drive motor; 6. Rotating spindle; 7. Rotating disk assembly; 701. Main disk; 7011. Perforation; 702. Spacer disk; 703. Arc plate; 8. Conical barrel; 801. Spiral guide vane; 802. Adjusting ring; 9. Oil collection cover; 901. Collection chamber; 902. Drain hole; 10. Still water zone; 11. Electric push rod; 12. Connecting frame.

[0015] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0016] The present invention provides an oily wastewater purification and treatment apparatus and method with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0017] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0018] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0019] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0020] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0021] like Figures 1 to 4 As shown, an embodiment of the present invention provides an oily wastewater purification and treatment device, including a lower tank 1 and an upper tank 2 fixed above it. An isolation cover 3 is fixedly connected inside the lower tank 1. The isolation cover 3 can block the wastewater entering the lower tank 1, preventing the wastewater from directly impacting the rising fluid in the middle and ensuring the rotation state of the rising fluid. At the same time, under the action of the isolation cover 3, the wastewater needs to flow downward first and pass the bottom of the isolation cover 3 before it can rise. This process can cause the sedimented impurities in the water to be collected and deposited in the cone at the bottom of the lower tank 1. A rectifier plate 4 is fixedly connected inside the isolation cover 3. The rectifier plate 4 has equidistant flow guide gaps 401 inside. The flow guide gaps 401 are inclined and the bottom opening of the flow guide gap 401 is larger than the top opening. This is used to rectify the rising wastewater. The flow guide gaps 401, which are larger at the bottom and smaller at the top, can rectify and distribute the fluid. The inclination angle guides the fluid to pre-rotate, and the gradually narrowing cross section can accelerate the fluid, providing a stable and evenly distributed inflow for subsequent treatment.

[0022] In this embodiment, as Figure 4As shown, the isolation cover 3 has a recessed portion 302, and a circulation section 301 is formed between the isolation cover 3 and the lower tank 1. Upper drain holes 3021 are equidistantly opened inside the isolation cover 3 at the recessed portion 302. A water inlet pipe 101 and a liquid inlet pipe 102 are fixedly connected inside the lower tank 1. Both the water inlet pipe 101 and the liquid inlet pipe 102 are tangentially arranged, and their drain ports are located within the circulation section 301. Oily wastewater and auxiliary media such as micro-gas are discharged through this circulation section. Soaking water or demulsifier solution is injected into the lower tank 1 through the tangentially arranged water inlet pipe 101 and liquid inlet pipe 102. The tangential inlet design gives the fluid the initial kinetic energy of pre-swirling, and with the cooperation of the circulation section 301, the oily wastewater forms an initial swirling flow, which can initially help separate some floating oil and heavy impurities. The wastewater discharged upward through the upper discharge hole 3021 can form a water curtain on the outside of the rectifier plate 4 to restrict the wastewater passing through the rectifier plate 4, so that the wastewater surges upward in a more concentrated manner.

[0023] In this embodiment, as Figure 5 and Figure 6 As shown, a rotating main shaft 6 is coaxially arranged inside the upper tank 2. A drive motor 5 for driving the rotating main shaft 6 is fixedly connected to the top of the upper tank 2. A rotating disk assembly 7 is fixedly connected to the outside of the rotating main shaft 6. The shearing force generated by the rotating disk assembly 7 when rotating physically demulsifies the oil in the sewage. The rotating disk assembly 7 includes multiple disks coaxially spaced and fixed on the rotating main shaft 6, with gaps between adjacent disks. Each disk consists of a main disk 701 and spacer disks 702. Multiple arc-shaped plates 703 are fixedly connected at equal intervals between the main disk 701 and the spacer disks 702. Multiple perforations 7011 are equidistantly arranged inside 701. When the drive motor 5 drives the rotating disk assembly 7 to rotate at high speed, the fluid is subjected to severe shearing in the gaps between the disks. The arc plate 703 has an arc-shaped structure. When the rotating disk assembly 7 rotates at high speed, this structure guides the fluid to generate shearing and secondary eddies in the gaps between the disks. During the radial flow of the fluid in the gaps between the disks, some of the fluid passes through the perforations 7011 on the disks for exchange, which intensifies the turbulence and shear intensity of the fluid. This can tear the interface film of the oil droplets to achieve the effect of demulsification, which facilitates the subsequent aggregation of the oil phase.

[0024] In this embodiment, as Figure 2 and Figure 7 and Figure 8As shown, a conical barrel 8 is fixedly connected to the inner wall of the upper tank 2 and to the outside of the rotating disk assembly 7. A spiral guide vane 801 is provided on the inner wall of the conical barrel 8. An adjusting ring 802 is slidably connected to the outer wall of the conical barrel 8. Electric push rods 11 are symmetrically fixedly connected to the top of the upper tank 2. The telescopic end of the electric push rod 11 extends into the upper tank 2 and is fixedly connected to a connecting frame 12. The connecting frame 12 is fixedly connected to the outer wall of the adjusting ring 802. A still water zone 10 is formed between the conical barrel 8 and the inner wall of the upper tank 2. A drain pipe communicating with the still water zone 10 is fixedly connected inside the upper tank 2. The spiral guide vane 801 on the inner wall of the conical barrel 8... The rotating wastewater is transformed into a spiraling upward fluid. In this forced swirling field, the oil and water phases are rapidly separated under centrifugal force. The denser water rises along the wall, while the less dense oil droplets converge towards the central axis of the swirling flow to form an oil core. The separated water phase overflows through the conical bucket 8 into the still water zone 10 and is discharged through the drain pipe. The height of the adjusting ring 802 can be adjusted according to the density of the oil phase. When the oil phase density is low, the adjusting ring 802 is raised, which increases the depth of the oil collection hood 9 to maintain a sufficient oil layer thickness and prevent water from being pumped out. When the oil phase density is high, the adjusting ring 802 is lowered to avoid excessive oil layer thickness leading to oil leakage.

[0025] An oil collecting hood 9 is fixedly connected to the inner wall of the conical barrel 8 to collect oil sludge at the center of the vortex. The oil collecting hood 9 has a collection chamber 901 inside, and multiple drainage holes 902 connected to the collection chamber 901 are equidistantly opened inside the oil collecting hood 9. The upper tank 2 has an oil drain pipe connected to the collection chamber 901. After the collected oil core rises to the upper part of the conical barrel 8, it enters the collection chamber 901 through the drainage holes 902 on the oil collecting hood 9 and is finally discharged by the oil drain pipe.

[0026] The treatment method for oily wastewater purification and treatment equipment includes the following steps: S1. Oily wastewater and auxiliary liquid are injected into the lower tank 1 through the tangentially arranged water inlet pipe 101 and liquid inlet pipe 102, respectively. The two fluids mix in the circulation section 301 and form an initial swirling flow that rotates along the tank wall. Under the action of gravity and centrifugal force, the initial swirling flow causes the denser suspended solid particles to move towards the tank wall and slide down the wall to the conical collection area at the bottom of the lower tank 1. After the mixed fluid swirls to the bottom of the isolation cover 3, it enters the internal space of the isolation cover 3 from its lower edge. The fluid that enters the isolation cover 3 flows upward and is discharged upward through the upper discharge holes 3021 and the rectifier plate 4, which are evenly distributed in the concave section 302. Under the action of the guide gap 401, the fluid is accelerated and rectified, and then enters the upper tank 2. S2. After rectification and acceleration, the fluid enters the gap between the discs of the rotating disc assembly 7 from below. The drive motor 5 drives the entire rotating disc assembly 7 to rotate at high speed through the rotating main shaft 6, applying shear force to the fluid in the gap between the discs. At the same time, the arc plate 703 guides the fluid to generate secondary eddies. During the radial flow of the fluid in the gap between the discs, some of the fluid passes through the perforation 7011 and enters the adjacent gap between the discs, thereby aggravating the turbulence and mixing of the fluid. Under the combined action of the above shear, eddies and turbulence, the interfacial film of the emulsified oil droplets in the sewage is torn apart. S3. The fluid that has undergone shearing, demulsification and aggregation treatment is thrown out tangentially at high speed from the outer edge of the rotating disk group 7 under the action of centrifugal force. The thrown fluid enters the bottom inlet of the conical barrel 8 sleeved on the outside of the rotating disk group 7 tangentially. The spiral guide vane 801 fixed on the inner wall of the conical barrel 8 converts the tangentially flowing fluid into a spiral flow that rises along the barrel wall. In this swirling flow field, the oil phase with lower density converges towards the central axis of the swirling flow under the action of centrifugal force, forming a continuous oil core and moving upward. The water phase with higher density is thrown towards the vicinity of the inner wall of the conical barrel 8 and rises along the wall in a spiral shape. S4. After the rising oil core enters the oil collection hood 9, the oil phase enters the collection chamber 901 inside the oil collection hood 9 through the circumferentially distributed drainage holes 902. Then, it is discharged through the oil discharge pipe connected to the collection chamber 901. The separated water phase rises to the top edge of the conical barrel 8 and overflows from its overflow port. It enters the annular still water zone 10 formed between the outer wall of the conical barrel 8 and the inner wall of the upper tank 2. Finally, it is discharged through the drain pipe connected to the still water zone 10. When dealing with oil phases of different densities or changes in operating conditions, the electric push rod 11, in conjunction with the connecting frame 12, drives the adjusting ring 802 to rise and fall, thereby changing the height of the overflow port of the conical barrel 8. The rising and falling of the adjusting ring 802 can change the relative height between the overflow port at the top of the conical barrel 8 and the inlet of the oil collection hood 9, in order to adapt to the collection of oil phases of different densities.

[0027] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0028] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An oily wastewater purification and treatment device, comprising a lower tank (1) and an upper tank (2) fixed thereon, characterized in that, The lower tank (1) is fixedly connected to an isolation cover (3), and the isolation cover (3) is fixedly connected to a rectifier plate (4) for rectifying the rising sewage. The upper tank (2) is coaxially provided with a rotating main shaft (6), and a drive motor (5) for driving the rotating main shaft (6) is fixedly connected to the top of the upper tank (2). A rotating disk assembly (7) is fixedly connected to the outside of the rotating main shaft (6). The shearing force generated by the rotating disk assembly (7) when it rotates physically demulsifies the oil in the sewage. A conical barrel (8) is fixedly connected to the inner wall of the upper tank (2) and to the outside of the rotating disk assembly (7). A spiral guide vane (801) is provided on the inner wall of the conical barrel (8). An oil collection hood (9) is fixedly connected to the inner wall of the conical barrel (8) to collect the oil phase at the center of the vortex.

2. The oily wastewater purification and treatment device according to claim 1, characterized in that, The rotating disk assembly (7) includes multiple disks that are coaxially spaced and fixed on the rotating spindle (6), and inter-disk gaps are formed between adjacent disks.

3. The oily wastewater purification and treatment device according to claim 2, characterized in that, The disk is composed of a main disk (701) and a spacer disk (702). Multiple arc-shaped plates (703) are fixedly connected at equal intervals between the main disk (701) and the spacer disk (702). Multiple perforations (7011) are opened at equal intervals inside the main disk (701).

4. The oily wastewater purification and treatment device according to claim 3, characterized in that, The isolation cover (3) is provided with a recessed part (302), and an aeration part (301) is formed between the isolation cover (3) and the lower tank (1). The isolation cover (3) is provided with upper row holes (3021) at equal intervals inside the recessed part (302).

5. The oily wastewater purification and treatment device according to claim 4, characterized in that, The lower tank (1) is fixedly connected to a water inlet pipe (101) and a liquid inlet pipe (102). The water inlet pipe (101) and the liquid inlet pipe (102) are both tangentially arranged, and the drain ports of the water inlet pipe (101) and the liquid inlet pipe (102) are located in the circulation section (301).

6. The oily wastewater purification and treatment device according to claim 4, characterized in that, The rectifier disk (4) has equidistant flow guide gaps (401) inside. The flow guide gaps (401) are inclined and the bottom opening of the flow guide gaps (401) is larger than the top opening.

7. The oily wastewater purification and treatment device according to claim 1, characterized in that, An adjusting ring (802) is slidably connected to the outer wall of the conical barrel (8), and an electric push rod (11) is symmetrically fixedly connected to the top of the upper tank (2). The telescopic end of the electric push rod (11) extends into the upper tank (2) and is fixedly connected to a connecting frame (12), and the connecting frame (12) is fixedly connected to the outer wall of the adjusting ring (802).

8. The oily wastewater purification and treatment device according to claim 1, characterized in that, A still water zone (10) is formed between the conical barrel (8) and the inner wall of the upper tank (2), and a drain pipe connected to the still water zone (10) is fixedly connected inside the upper tank (2).

9. The oily wastewater purification and treatment device according to claim 1, characterized in that, The oil collection hood (9) has a collection chamber (901) inside, and multiple drainage holes (902) connected to the collection chamber (901) are equidistantly arranged inside the oil collection hood (9). The upper tank (2) has an oil drain pipe connected to the collection chamber (901) inside.

10. The treatment method of the oily wastewater purification and treatment device according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Oily wastewater and auxiliary liquid are injected into the lower tank (1) through the tangential inlet to form an initial vortex, and the wastewater is rectified and accelerated under the action of the rectifier plate (4); S2. The rectified fluid enters the rotating disk assembly (7) and undergoes physical demulsification under the action of the high-speed rotating disk assembly (7). S3. The demulsified fluid is tangentially thrown into the conical barrel (8), and under the guidance of the spiral guide vane (801), a centrifugal vortex is formed to achieve centrifugal separation of oil and water. S4. The separated oil phase gathers in the center, enters the collection chamber (901) of the oil collection hood (9) through the drainage hole (902) and is discharged, while the water phase overflows to the still water area (10) and is discharged.

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