A hydrodynamic cavitation device and sewage treatment equipment thereof

Abstract

The present invention discloses a hydrodynamic cavitation device and sewage treatment equipment thereof, belonging to the technical field of sewage treatment equipment. The hydrodynamic cavitation device includes a shell with a bubble feeding chamber provided therein, a water inlet and a water outlet provided at the bottom and top of the shell respectively, a rotating impeller provided in the bubble feeding chamber, a filter provided at the water inlet, a venturi tube provided at the water outlet, and a porous plate provided at the outlet of the venturi tube. The sewage treatment equipment includes a grid pool, a regulating pool, an anaerobic pool, an anoxic pool, an aerobic pool, a membrane bioreactor pool and a clear water pool arranged in sequence, and a hydrodynamic cavitation device is installed at the bottom of the membrane bioreactor pool. The position and structural design of the water inlet and the water outlet are reasonable, the liquid travel path is short, the flow rate consumption is low, the rotation of the rotating impeller can provide a strong lift for the liquid, provide a higher flow rate and pressure for the liquid, increase the liquid flow rate, promote the generation of a large number of bubbles, ensure the dissolved oxygen effect and impurity removal effect, aeration has no dead angle, and the bubble holes are not easy to be blocked.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment equipment, in particular to a hydrodynamic cavitation device and sewage treatment equipment thereof. Background Art

[0002] Wastewater treatment equipment typically includes multiple treatment units, including pretreatment, biochemical treatment, sedimentation / filtration, and disinfection. The membrane bioreactor (MBR) contains membrane modules for microbial colonization and aeration equipment to increase dissolved oxygen. Over time, these systems can become coated with solid particles, grease, and other impurities, impacting the efficiency of microbial treatment. Furthermore, organic pollutants can grow within the MBR, and the use of chemical disinfectants can lead to increased costs, environmental pollution, and health risks. Furthermore, the aeration system within the MBR consumes significant power and is prone to clogging, which can lead to contamination of the membrane, ultimately causing equipment corrosion and impurity deposition.

[0003] The emergence of hydraulic cavitation technology has provided a more advanced, environmentally friendly, and efficient solution to the aforementioned problems in membrane bioreactors. This technology, based on the principles of liquid dynamics, reduces the local pressure of the liquid during high-speed flow by controlling the size and shape of slits or pores. When the pressure falls below the saturated vapor pressure of the liquid, a large number of continuously collapsing cavitation bubbles are generated. These cavitation bubbles create high-energy impacts and jets on the surrounding liquid, separating solid particles, grease, and other impurities from the water. At the same time, under the action of this high energy, the liquid is broken down into active oxygen atoms and hydroxyl radicals, which recombine to form hydrogen peroxide. These free radicals have strong oxidizing properties and can effectively degrade organic pollutants, biodegradable substances, and increase the dissolved oxygen rate. Compared to aeration systems, they consume less power and are less prone to clogging. However, existing hydraulic cavitation generators suffer from an unreasonable structural design, resulting in insufficient liquid lift, insufficient flow velocity, and a small number of cavitation bubbles. This results in poor impurity removal and insufficient dissolved oxygen rates within the membrane bioreactor. Summary of the Invention

[0004] The purpose of the present invention is to solve the above technical problems and provide a hydrodynamic cavitation device and sewage treatment equipment thereof. The water inlet and the water outlet are respectively arranged at the bottom and the top of the shell, the position structure is reasonably designed, the liquid travel path is short, the flow rate consumption is low, and the rotation of the rotary impeller can provide a strong lift for the liquid, provide a higher flow rate and pressure for the liquid, increase the liquid flow rate, promote the generation of a large number of bubbles, ensure the dissolved oxygen effect and impurity removal effect, and there is no dead angle for aeration. Under the cooperation of high-speed impact and filter screen, the bubble holes are not easy to be blocked.

[0005] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention discloses a hydrodynamic cavitation device, comprising a shell with a bubble feeding chamber therein, the bottom and top of the shell are respectively provided with a water inlet and a water outlet, the water inlet and the water outlet are both connected to the bubble feeding chamber, a rotating impeller capable of providing lift is provided in the bubble feeding chamber, a filter is provided at the water inlet, a venturi tube is fixedly connected to the water outlet, the water inlet and the water outlet of the venturi tube are connected, and a porous plate is provided at the outlet of the venturi tube.

[0006] Preferably, the rotating impeller divides the bubble feeding chamber into an annular cavity section and a cylindrical cavity section distributed vertically, and the cavity width of the annular cavity section gradually decreases from bottom to top.

[0007] Preferably, the annular cavity segment is in a conical ring shape, and the small diameter end of the annular cavity segment faces the cylindrical cavity segment.

[0008] Preferably, a mounting chamber for encapsulating the drive motor is provided in the housing, the mounting chamber is surrounded by the annular cavity segment, and the output shaft of the drive motor is coaxially and fixedly connected to the rotating impeller.

[0009] Preferably, the bottom of the shell is provided with a mounting foot that enables the water inlet to have a water inlet distance from the mounting surface, and the mounting foot is provided with an anchor bolt hole.

[0010] Preferably, at least three water outlets are provided, and the three water outlets are arranged around the installation chamber.

[0011] Also disclosed is a sewage treatment equipment, including a grille pool, a regulating pool, an anaerobic pool, an anoxic pool, an aerobic pool, a membrane biological reactor and a clear water pool arranged in sequence. The grille pool is provided with a grille that divides it into an inlet side and an outlet side. The inlet side of the grille pool is provided with an inlet pipe. The outlet side of the grille pool is connected to the regulating pool through a first overflow pipe. The regulating pool and the anaerobic pool are connected through a sewage lifting pump. The membrane assembly in the membrane biological reactor and the clear water pool are connected through a clear water lifting pump. The bottom of the anaerobic pool and the bottom of the anoxic pool are connected to each other through a connecting port. The anoxic pool and the aerobic pool are connected through a second overflow pipe. The above-mentioned hydraulic cavitation device is installed at the bottom of the membrane biological reactor. The water inlet faces downward and has an inlet distance from the bottom of the membrane biological reactor.

[0012] Preferably, the clean water lifting pump adopts an intermittent water discharge mode.

[0013] Preferably, an agitator is installed at the bottom of the regulating tank.

[0014] Preferably, a sloped anti-sinking weir is provided at the bottom of the anaerobic tank, and the bottom of the sloped anti-sinking weir extends to the connecting port.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] 1. In the hydrodynamic cavitation device of the present invention, the water inlet and the water outlet are respectively arranged at the bottom and the top of the shell. The structural design is reasonable. The liquid enters from the bottom and is discharged from the top. The walking path is short and the flow rate consumption is low. The rotating impeller in the bubble feeding chamber can provide a strong lift for the liquid, provide a higher flow rate and pressure for the liquid, so as to greatly increase the liquid flow rate, promote the generation of a large number of bubbles, ensure the dissolved oxygen effect and impurity removal effect in the pool body, and the high-speed impact and the filter screen at the water inlet make the bubble hole not easy to be blocked.

[0017] 2. The membrane biological reactor in the sewage treatment equipment of the present invention adopts a hydraulic cavitation device. Compared with traditional disc aerators and air exhaust aerators, the hydraulic cavitation generating device can generate a large number of cavitations, achieving aeration without dead angles and without the need for an external fan. During the rupture process, the cavitations will produce considerable impact force on the surrounding small local space, replacing the backwash pump to clean the surface of the membrane component, slowing down the pollution process of the membrane surface, and the hydraulic cavitation generating device is not easy to clog. At the same time, it promotes the full mixing of chemical agents and sewage, directly degrading organic pollutants in sewage, and reducing the use of chemical agents. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive efforts.

[0019] Figure 1 It is a structural diagram of sewage treatment equipment;

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the hydrodynamic cavitation device;

[0021] Figure 3 It is a front view of the hydrodynamic cavitation device;

[0022] Figure 4 is a cross-sectional view of a hydrodynamic cavitation device;

[0023] Figure 5 This is an example diagram of a multi-well plate;

[0024] Figure 6 It is a three-dimensional structural diagram of the rotating impeller;

[0025] Figure 7 is a top view of the rotating impeller;

[0026] Figure 8 This is a front view of the rotating impeller.

[0027] Explanation of the accompanying symbols: 1. Grid pool; 2. Regulating pool; 3. Anaerobic pool; 4. Anoxic pool; 5. Aerobic pool; 6. Membrane biological reactor; 7. Clean water pool; 8. Grid; 9. Sewage lifting pump; 10. Membrane assembly; 11. Hydrodynamic cavitation device; 12. Clean water lifting pump; 13. Connecting port; 14. Slope anti-sinking weir; 801. Shell; 802. Venturi tube; 803. Perforated plate; 804. Installation foot; 805. Anchor bolt hole; 806. Bubble feeding chamber; 807. Installation chamber; 808. Drive motor; 809. Rotating impeller; 810. Filter screen; 811. Connecting shaft; 812. Blade; 813. Installation groove; 814. Bubble hole; 815. Annular cavity section. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Example 1

[0030] This embodiment provides a hydrodynamic cavitation device, such as Figures 1 to 8 As shown, it includes a shell 801, and a bubble feeding chamber 806 is provided in the shell 801. The bottom and top of the shell 801 are respectively provided with a water inlet and a water outlet, and the water inlet and the water outlet are both connected to the bubble feeding chamber 806. A rotating impeller 809 is provided in the bubble feeding chamber 806. After the liquid enters from the water inlet, the rotating impeller 809 is started. During the stirring process of the rotating impeller 809, it can provide lift to the liquid and accelerate the speed of the liquid flowing toward the water outlet. A venturi tube 802 is fixedly connected to the water outlet, and the water inlet and the water outlet of the venturi tube 802 are connected. A porous plate 803 is provided at the drain port of the venturi tube 802. After the high-speed liquid flows into the venturi tube 802 from the water outlet, a large number of cavitations are generated, and the cavitations can flow out from the bubble holes 814 on the porous plate 803 along with the liquid. A filter screen 810 is provided at the water inlet, which can intercept impurities outside the bubble feeding chamber 806 to prevent the bubble holes 814 from being blocked and the long objects from being entangled in the rotating impeller 809.

[0031] The number of venturi tubes 802 can be set as needed, such as one, two or more. Generally speaking, the more the number, the larger the coverage area and the greater the amount of bubbles generated. Of course, the number should not be too large, otherwise it will cause liquid diversion and insufficient water pressure, which will reduce the amount of bubbles. The bubble holes 814 on the porous plate 803 are preferably circular holes, but they can also be set as holes of other shapes. The number and arrangement of the bubble holes 814 can be adjusted as needed, such as Figure 5 The following are some common arrangement methods and setting quantities, which are of course not limited to Figure 5 The setting method in .

[0032] Working principle:

[0033] The hydrodynamic cavitation device 11 is installed in the membrane bioreactor 6 or other tank body that needs to be used. The water inlet of the shell 801 is downward, and there is a certain distance between the water inlet and the tank body so that the liquid can enter the water inlet through the distance, and then enter the bubble feeding chamber 806 through the water inlet. The rotating impeller 809 is started. The high-speed rotating impeller 809 will generate a strong lift. The liquid gains speed and pressure under the strong lift, enters the venturi tube 802 through the water outlet, and then enters the venturi tube 806 through the venturi tube 806. The inlet section of 02 reaches the necking section, which further increases the liquid flow rate. According to Bernoulli's principle, the higher the liquid flow rate, the lower its internal pressure. Therefore, cavitation will occur in the local low-pressure area in the contraction section, forming a large number of tiny bubbles, which then flow from the throat and the diffusion section to the porous plate 803 in turn, and finally are ejected at high speed from the bubble holes 814 of the porous plate 803. After ejection, the flow rate increases and the pressure further decreases. When it decreases to the saturated vapor pressure, a large number of cavitations will be generated to fill the membrane bioreactor.

[0034] The water inlet and outlet of the hydrodynamic cavitation device 11 are respectively arranged at the bottom and top of the shell 801. The structural design is reasonable, so that the liquid enters from the bottom and is discharged from the top. The travel path is short, and the flow rate consumption is reduced. The rotating impeller 809 in the bubble feeding chamber 806 can provide a strong lift for the liquid, provide the liquid with a higher flow rate and pressure, so as to greatly increase the liquid flow rate, and then promote a significant increase in the amount of bubbles generated, thereby ensuring the dissolved oxygen effect and impurity removal effect in the pool body.

[0035] In this embodiment, Figures 1 to 8 As shown, the rotating impeller 809 divides the bubble feeding chamber 806 into an annular cavity section 815 and a cylindrical cavity section distributed above and below. The cavity width of the annular cavity section 815 gradually decreases from bottom to top, that is, the annular cavity section 815 is necked from bottom to top, which is conducive to the improvement of fluid velocity.

[0036] Furthermore, in this embodiment, if Figures 1 to 8As shown, the annular cavity section 815 is a conical ring as a whole, the small diameter end of the annular cavity section 815 faces the cylindrical cavity section, and the large diameter end of the annular cavity section 815 is provided with a water outlet, that is, the Venturi tube 802 is provided at the large diameter end of the annular cavity section 815.

[0037] In this embodiment, Figures 1 to 8 As shown, housing 801 includes an installation chamber 807, which houses a drive motor 808. Installation chamber 807 is surrounded by an annular cavity 815. The output shaft of drive motor 808 is coaxially and fixedly connected to a rotating impeller 809 to drive the rotation of impeller 809. Specifically, an axial hole is formed in installation chamber 807, through which the output shaft of drive motor 808 extends. The axial hole and the output shaft are sealed.

[0038] Furthermore, in this embodiment, Figures 1 to 8 As shown, a control module is also provided inside the installation chamber 807 , and the circuit of the control module extends from the side of the housing 801 and is connected to the electric control system.

[0039] In this embodiment, Figures 1 to 8 As shown, at least three water outlets are provided, and the three water outlets are arranged around the installation chamber 807, that is, at least three venturi tubes 802 surround the installation chamber 807. As preferably, four water outlets are provided, and the four venturi tubes 802 are evenly surrounded around the installation chamber 807.

[0040] In this embodiment, Figures 1 to 8 As shown, the bottom of the shell 801 is provided with mounting feet 804. The number of mounting feet 804 is set as needed. Generally, at least three are required for stability, and four mounting feet 804 are preferred. The mounting feet 804 are provided with anchor bolt holes 805, which can be bolted to the bottom of the pool body through bolts and anchor bolt holes 805. The contact surface between the mounting feet 804 and the pool body extends beyond the water inlet, so that after the mounting feet 804 are bolted to the bottom of the pool body, there is a certain water inlet spacing between the water inlet and the mounting surface of the pool body, and water can flow into the water inlet through this water inlet spacing. Preferably, the water inlet spacing is more than 3 cm.

[0041] In this embodiment, Figures 1 to 8 As shown, the rotary impeller 809 mainly consists of a connecting shaft 811 and three blades 812. The blades 812 are fixed to the connecting shaft 811 in the shape of the letter C. A mounting slot 813 is provided at the top and bottom ends of the connecting shaft 811, and the output shaft of the drive motor 808 is keyed into the mounting slot 813.

[0042] Example 2

[0043] This embodiment provides a sewage treatment device, such as Figures 1 to 8As shown, it includes a grid pool 1, a regulating pool 2, an anaerobic pool 3, an anoxic pool 4, an aerobic pool 5, a membrane bioreactor 6, and a clean water pool 7, which are arranged in sequence. The grid pool 1 is provided with a grid 8, which divides the grid pool 1 into an inlet side and an outlet side. The inlet side of the grid pool 1 is provided with an inlet pipe, and the outlet side of the grid pool 1 is connected to the regulating pool 2 through a first overflow pipe. When the water level rises to the height of the first overflow pipe, it will automatically flow into the regulating pool 2. The regulating pool 2 and the anaerobic pool 3 are connected by a sewage lift pump 9. Specifically, the inlet end of the sewage lift pump 9 is connected to the bottom of the regulating pool 2, and the outlet end of the sewage lift pump 9 is connected to the top of the anaerobic pool 3. The membrane bioreactor 6 has a built-in membrane assembly 10. During use, the membrane assembly 10 is in a vertical state. The membrane assembly 10 and the clean water pool 7 are connected by a clean water lift pump 12. After the sewage is filtered by the filter membrane of the membrane assembly 10, it is pumped out through the gap between the liner of the membrane assembly 10 and the guide cloth via the clean water lift pump 12 pipeline. The bottom of the anaerobic tank 3 and the bottom of the anoxic tank 4 are connected to each other through a connecting port 13. The anoxic tank 4 and the aerobic tank 5 are connected by a second overflow pipe. Preferably, for better treatment effect, the aerobic tank 5 is the largest unit in the sewage treatment equipment, and its volume is designed with the influent water volume and water quality as reference conditions. The bottom of the membrane bioreactor 6 is installed with the hydraulic cavitation device 11 in Example 1. The hydraulic cavitation device 11 is located below the membrane assembly 10. The water inlet of the hydraulic cavitation device 11 faces downward, and there is a water inlet distance between the water inlet and the bottom of the membrane bioreactor 6. The bubbles generated by the hydraulic cavitation device 11 continuously flush the membrane surface of the membrane assembly 10, making it difficult for suspended pollutants to deposit on the membrane surface of the membrane assembly 10, extending the membrane cleaning cycle, and ensuring the long-term stable operation of the membrane equipment. Preferably, a sludge discharge port is also provided at the bottom of the membrane bioreactor 6 to facilitate regular cleaning of sludge.

[0044] Working principle:

[0045] During operation, sewage flows from the inlet pipe into the screen tank 1, where large particles of impurities are removed, thus reducing the risk of blockage in other processes. The regulating tank 2 collects and settles the sewage, maintaining the quality of the sewage within a certain range before entering subsequent treatment. The sewage lift pump 9 then pipes the settled sewage into the anaerobic tank 3. The sewage in the anaerobic tank 3 comes into contact with microorganisms within the tank. These microorganisms metabolize the organic matter in the sewage and, in the absence of oxygen, undergo acidification, hydrogen production, and acetic fermentation, converting the organic matter into harmless substances such as methane and carbon dioxide. After being treated in the anaerobic tank 3, the organic matter in the sewage is fully decomposed and converted, reaching the stage for further purification. The sewage then flows into the anoxic tank 4. Anoxic tank 4 further treats the sewage, primarily by utilizing the anoxic environment to degrade and transform organic matter, remove residual, difficult-to-decompose organic matter, and reduce nitrates. Providing a suitable anoxic environment and slow water flow, the anoxic tank 4 promotes the optimization and diversity of the bacterial community while also reducing the waste and pollution of nutrients such as nitrogen and phosphorus. The sewage then enters the aerobic tank 5. Aerobic tank 5 primarily removes harmful substances such as organic matter and ammonia nitrogen from the wastewater. Under aerobic conditions, microorganisms decompose the organic matter and ammonia nitrogen into harmless substances such as carbon dioxide, water, and nitrates. The treated wastewater then enters membrane bioreactor 6. The presence of membrane assembly 10 in membrane bioreactor 6 significantly enhances the system's solid-liquid separation capability. Microorganisms and suspended solids (SS) are completely retained within membrane bioreactor 6, achieving a complete separation between hydraulic retention time and activated sludge, eliminating the sludge bulking problem associated with traditional activated sludge processes. Membrane bioreactor 6 not only maintains a high concentration of microorganisms within the bioreactor, increasing the volumetric load of the treatment unit, but also saves floor space, replacing the sedimentation and filtration techniques used in traditional processes. A large number of cavitation bubbles flush the membrane assembly 10 of membrane bioreactor 6. Pollutants accumulated on the membrane surface are dislodged by the turbulent flow generated by the continuously rising cavitation bubbles and the vortexes generated by their collapse, achieving a cleaning effect. The vortexes also thoroughly mix chemicals with the wastewater, directly degrading organic pollutants in the wastewater and reducing chemical usage. The clean water lift pump 12 then lifts the clean water produced by the membrane modules 10 in the membrane bioreactor 6 to the clean water tank 7 for collection. The treated clean water can be safely discharged into sewage pipes, rivers or groundwater layers, avoiding damage to groundwater resources, aquatic ecosystems and human health.

[0046] In this embodiment, Figures 1 to 8 As shown, the grid 8 of the grid pool 1 is composed of metal bars, grid plates, and grid sheets, and the opening size of the grid 8 is 0.3 mm. All the above parameters are reference values ​​and are not limited to the above values.

[0047] In this embodiment, Figures 1 to 8As shown, the sewage lifting pump 9 adopts a self-priming pump, one for use and one for backup, with a lift of 5m and a flow rate of 4m 3 / h, speed 1450r / min. All the above parameters are reference values ​​and are not limited to the above values.

[0048] In this embodiment, Figures 1 to 8 As shown, the membrane material of the membrane assembly 10 is preferably polyvinylidene fluoride, which has the advantages of high flux, acid and alkali corrosion resistance and a wide pore size range.

[0049] In this embodiment, Figures 1 to 8 As shown, the clean water lifting pump 12 adopts a self-priming pump, one for use and one for backup, with a lift of 8m and a flow rate of 4m 3 / h, speed 1450r / min. All the above parameters are reference values ​​and are not limited to the above values.

[0050] In this embodiment, Figures 1 to 8 As shown, in order to ensure the formation of sludge flocs, the dissolved oxygen in the anoxic tank 4 is generally controlled at 2-4 mg / L.

[0051] In this embodiment, Figures 1 to 8 As shown, the distance between the water inlet and the bottom of the membrane biological reaction tank 6 is more than 3 cm.

[0052] In order to prevent the continuous suction of the clean water lifting pump 12 from accelerating the accumulation of mixed sludge on the membrane surface to form a filter cake layer, in this embodiment, Figures 1 to 8 As shown, the clean water lift pump 12 uses an intermittent water discharge mode. The pumping-on / off time ratio is 7 minutes / 1 minute. When the pumping is stopped, the pressure differential across the membrane of the membrane assembly 10 decreases to zero. Contaminants accumulated on the membrane surface are dislodged by the turbulent flow generated by the continuously rising cavitation bubbles and the vortex generated by the cavitation bubble collapse, achieving a cleaning effect. All the above parameters are for reference only and are not limited to the above values.

[0053] In this embodiment, Figures 1 to 8 As shown, an agitator is installed at the bottom of the regulating tank 2. Preferably, five agitators are installed at the center and four corners of the regulating tank 2. To prevent sludge deposition, a sludge discharge port is also provided at the bottom of the regulating tank 2. The agitators are timed to start for 1 minute every 30 minutes. All the above parameters are for reference only and are not limited to the above values.

[0054] In this embodiment, Figures 1 to 8 As shown, a sloped anti-settling weir 14 is provided at the bottom of the anaerobic tank 3, and the bottom of the sloped anti-settling weir 14 extends to the connecting port 13. Because the anaerobic tank 3 is a relatively closed environment with no oxygen inside, the sloped anti-settling weir 14 is provided at the bottom to facilitate regular cleaning and transfer of sludge and prevent sludge from settling at the bottom.

[0055] In this embodiment, Figures 1 to 8 As shown, the clean water tank 7 is equipped with a float level gauge and a water quality detection device, and is equipped with an automatic control system to ensure the stability of the water level, so as to collect and store the treated clean water that meets the standards from the membrane biological reactor 6. The clean water tank 7 can be provided with a drain pipe to discharge the clean water.

[0056] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A hydrodynamic cavitation device, characterized in that: The invention comprises a shell with a feeding bubble chamber provided therein, wherein the bottom and top of the shell are respectively provided with a water inlet and a water outlet, the water inlet and the water outlet are both communicated with the feeding bubble chamber, the feeding bubble chamber is provided with a rotating impeller capable of providing lift, the water inlet is provided with a filter screen, the water outlet is fixedly connected with a venturi tube, the water inlet and the water outlet of the venturi tube are communicated, a porous plate is provided at the outlet of the venturi tube, the rotating impeller divides the feeding bubble chamber into annular cavity sections and cylindrical cavity sections distributed upper and lower, the cavity width of the annular cavity section gradually decreases from bottom to top, an installation cavity for encapsulating a driving motor is provided in the shell, the installation cavity is surrounded by the annular cavity section, and the output shaft of the driving motor is coaxially and fixedly connected with the rotating impeller.

2. A hydrodynamic cavitation device according to claim 1, characterized in that: The annular cavity segment is in a conical ring shape, and the small diameter end of the annular cavity segment faces the cylindrical cavity segment.

3. A hydrodynamic cavitation device according to claim 1, characterized in that: The bottom of the shell is provided with a mounting foot that enables the water inlet to have a water inlet distance from the mounting surface, and the mounting foot is provided with an anchor bolt hole.

4. A hydrodynamic cavitation device according to claim 1, characterized in that: At least three water outlets are provided, and the three water outlets are arranged around the installation chamber.

5. A sewage treatment equipment, characterized in that: The invention comprises a grid pool, a regulating pool, an anaerobic pool, an anoxic pool, an aerobic pool, a membrane biological reactor and a clear water pool, the grid pool being provided with a grid which divides the grid pool into an inlet side and an outlet side, the inlet side of the grid pool being provided with an inlet pipe, the outlet side of the grid pool being connected to the regulating pool via a first overflow pipe, the regulating pool and the anaerobic pool being connected via a sewage lifting pump, the membrane assembly in the membrane biological reactor and the clear water pool being connected via a clear water lifting pump, the bottom of the anaerobic pool and the bottom of the anoxic pool being connected to each other via a connecting port, the anoxic pool and the aerobic pool being connected via a second overflow pipe, the bottom of the membrane biological reactor being provided with a hydrodynamic cavitation device as claimed in any one of claims 1 to 4, the water inlet being downwardly facing and having a water inlet distance from the bottom of the membrane biological reactor.

6. A sewage treatment equipment according to claim 5, characterized in that: The clean water lifting pump adopts an intermittent water discharge mode.

7. The sewage treatment equipment according to claim 5, characterized in that: A stirrer is installed at the bottom of the regulating tank.

8. The sewage treatment equipment according to claim 5, characterized in that: A slope anti-sinking weir is arranged at the bottom of the anaerobic tank, and the bottom of the slope anti-sinking weir extends to the communication port.

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