A sewage treatment device for hydraulic engineering

Abstract

The present application relates to sewage treatment technical field, especially to a kind of sewage treatment device of water conservancy project.The present application aims at overcoming the shortcomings that suspended solids precipitation process time is longer, and precipitate is easy to secondary pollution sewage in the process of cleaning sedimentation tank.The technical implementation scheme of the present application is: sedimentation tank, the sedimentation tank is opened in upper portion and is located in the lower portion of sewage discharge port of sewage discharge port located in its upper portion, the sedimentation tank is opened in lower portion;Rotary outer tube, the movable setting of rotary outer tube is in the bottom of sedimentation tank;Venturi tube, the outer wall of rotary outer tube is provided with venturi tube, and the venturi tube has several ones.The present application is provided with venturi tube, and venturi tube simultaneously sprays flocculating agent and air, so that flocculating agent blows air into fine bubbles, flocculating agent becomes flocculating group and adheres to pollutant and floats on the surface of sewage, while improving the efficiency of sewage treatment, it is convenient for staff to handle the pollutant adhered by flocculating group in time, thereby avoiding secondary pollution of pollutant to sewage.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a wastewater treatment device for water conservancy projects. Background Technology

[0002] Wastewater treatment is a process that effectively removes pollutants from wastewater through physical sedimentation and biological or chemical treatment. When wastewater is discharged into the natural environment after wastewater treatment, it will not damage the natural environment's self-repairing ability.

[0003] In existing wastewater treatment processes, suspended solids in wastewater are typically removed through settling or flocculant sedimentation. This process usually takes place in a sedimentation tank, but the sedimentation process is lengthy, and the sediment accumulates at the bottom of the tank. Excessive sediment accumulation can clog the flow of wastewater in the sedimentation tank. In existing technologies, common sediment treatment methods include dredging and pipeline extraction. However, both of these methods generate turbulence at the bottom of the wastewater, causing the sediment at the bottom of the sedimentation tank to be affected by the turbulence and flow around during the cleaning process. This disperses the sediment and causes secondary pollution of the wastewater inside the sedimentation tank. Therefore, a wastewater treatment device for water conservancy projects that is highly efficient and avoids secondary pollution of wastewater is proposed. Summary of the Invention

[0004] In order to overcome the disadvantages of long sedimentation time and the easy secondary pollution of sewage by sediment during sedimentation tank cleaning, the purpose of this invention is to provide a sewage treatment device for water conservancy projects that is highly efficient and avoids secondary pollution of sewage.

[0005] The technical implementation scheme of the present invention is: a sewage treatment device for a water conservancy project, comprising:

[0006] Sedimentation tank;

[0007] The outer cylinder is movably installed at the bottom of the sedimentation tank;

[0008] Venturi tubes are provided on the outer wall of the rotating outer cylinder, and the venturi tubes are provided with flocculant inlet and air inlet;

[0009] The first pipeline is connected to the flocculant inlet.

[0010] A gas-liquid slip ring is provided at the bottom of the sedimentation tank, which is connected to the first pipeline;

[0011] The second pipe is connected to the air inlet and is connected to the gas-liquid slip ring.

[0012] A support and protection unit is provided inside the rotating outer cylinder to support the venturi tube;

[0013] A sealing adjustment unit is provided inside the rotating outer cylinder for adjusting the starting state of the venturi tube;

[0014] A variable speed rotation unit is provided at the top of the inner side of the rotating outer cylinder for driving the venturi tube to rotate at different speeds.

[0015] The stirring and rotating unit has several stirring and rotating units on the outer wall of the rotating outer cylinder for mixing sewage and flocculant.

[0016] A flocculation storage unit is provided on the inner wall of the sedimentation tank for collecting and storing flocs.

[0017] Preferably, the support and protection unit includes:

[0018] Support rods: Several support rods are provided inside the rotating outer cylinder;

[0019] The inner cylinder is rotated, and several of the support rods are fixedly connected to the rotating inner cylinder. The rotating inner cylinder is fixedly connected to several of the venturi tubes through it.

[0020] Preferably, the sealing adjustment unit includes:

[0021] A cam column is rotatably installed inside the rotating inner cylinder. The cam column is fixedly connected to the sedimentation tank. Several cam grooves are opened on the outer wall of the cam column, and the cam grooves correspond to several Venturi tubes at the same height.

[0022] A stepped sealing plug is slidably disposed inside the venturi tube, with one end of the stepped sealing plug contacting the cam groove.

[0023] A first spring is provided on the stepped sealing plug, and one end of the first spring is fixedly connected to the venturi tube.

[0024] Preferably, the variable speed rotation unit includes:

[0025] A support shell is provided on the top of the cam column;

[0026] An electric motor is provided inside the support housing, and the output shaft of the motor passes through the support housing;

[0027] An eccentric disc is provided on the output shaft of the motor;

[0028] A movable frame is movably mounted on the eccentric disk, and a horizontal slide groove is provided at the center of the movable frame, with the eccentric shaft of the eccentric disk located inside the horizontal slide groove.

[0029] A limiting frame is provided, and the tops of the symmetrically arranged limiting frames are slidably connected to the movable frame.

[0030] Preferably, the variable speed rotation unit further includes:

[0031] The inner side of the movable frame has rectangular guide slots, and a ratchet is slidably disposed in two opposite guide slots.

[0032] The second spring, a plurality of second springs are provided on one side of the ratchet rack, and one end of the plurality of second springs is fixedly connected to the movable frame;

[0033] A ratchet is provided at the top of the inner part of the rotating outer cylinder, and the ratchet meshes with the ratchet rack.

[0034] Preferably, it also includes:

[0035] A lower corrugated ring is fixedly connected to the bottom of the sedimentation tank;

[0036] An upper wave ring is fixedly connected to the bottom of the rotating outer cylinder, and the upper wave ring is in contact with the lower wave ring.

[0037] Preferably, the stirring and rotating unit includes:

[0038] Fan blades: Several fan blades are provided on the outer circumferential wall of the rotating outer cylinder.

[0039] Preferably, the stirring and rotating unit further includes:

[0040] A brush bar is slidably disposed at one end of the fan blade;

[0041] A third spring is provided at one end of the brush assembly, and one end of the third spring is fixedly connected to the fan blade.

[0042] Preferably, the flocculation storage unit includes:

[0043] The sedimentation tank has floc collection tanks arranged in a mirror pattern on its inner wall. The floc collection tanks are used to collect and store flocs.

[0044] An isolation net is provided at the connection between the floc storage tank and the sedimentation tank. The isolation net is used to prevent flocs from being guided out of the floc storage tank by the vortex.

[0045] Preferably, it also includes:

[0046] Bubble nozzles: Several bubble nozzles are installed at the bottom of the sedimentation tank.

[0047] The beneficial effects of this invention are:

[0048] 1. This invention, by incorporating a Venturi tube, differs from existing technologies. The Venturi tube simultaneously sprays flocculant and air, causing the flocculant to break the air into fine bubbles. This keeps the flocculant at a low density during the flocculation process, causing it to form flocs that adhere to pollutants and float on the wastewater surface. This improves wastewater treatment efficiency and facilitates timely removal of pollutants adhering to the flocs, thus preventing secondary pollution of the wastewater.

[0049] 2. This invention, by setting up a variable speed rotation unit, enables the output shaft of the motor to drive the moving frame to smoothly slide back and forth at varying speeds. The ratchet and ratchet transform the smooth reciprocating sliding of the moving frame into a smooth counterclockwise rotation of the outer cylinder, thereby causing the venturi tube to rotate synchronously at varying speeds and spraying flocculant. This increases the flocculation volume of the flocculant when the venturi tube slows down, making it easier for workers to remove the flocculant and thus improving the cleaning efficiency of the sedimentation tank.

[0050] 3. This invention, by setting up bubble nozzles, allows workers to spray bubbles while the flocculant is being sprayed from the venturi tube. The bubbles will contact and protect the flocs with their own surface and promote the rise of the flocs through buoyancy. On the other hand, they will also adhere to pollutants in the wastewater through their own surface, thereby further improving the wastewater treatment efficiency. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0052] Figure 2 This is a cross-sectional schematic diagram of the sedimentation tank of the present invention;

[0053] Figure 3 This is a schematic diagram of the rotating outer cylinder of the present invention;

[0054] Figure 4 This is a cross-sectional schematic diagram of the rotating outer cylinder of the present invention;

[0055] Figure 5 This is a cross-sectional schematic diagram of the cam column of the present invention;

[0056] Figure 6 This is a cross-sectional schematic diagram of the venturi tube of the present invention;

[0057] Figure 7 This is a schematic diagram of the ratchet rack of the present invention;

[0058] Figure 8 This is a schematic diagram of the structure of the mobile frame of the present invention;

[0059] Figure 9 This is a schematic diagram of the ratchet mechanism of the present invention;

[0060] Figure 10 This is a cross-sectional schematic diagram of the upper and lower wavy rings of the present invention;

[0061] Figure 11 This is a cross-sectional schematic diagram of the brush array of the present invention;

[0062] Figure 12 For the present invention Figure 2 Enlarged view of a portion of point A in the middle.

[0063] The labels in the diagram are as follows: 1-Sedimentation tank, 101-Lower corrugated ring, 2-Rotating outer cylinder, 201-Upper corrugated ring, 3-Venturi tube, 301-Flocculant inlet, 302-Air inlet, 303-First pipe, 304-Gas-liquid slip ring, 305-Second pipe, 4-Support rod, 5-Rotating inner cylinder, 6-Cam column, 601-Cam groove, 7-Stepped sealing plug, 8-First spring, 9-Support shell, 10-Motor, 11-Eccentric disc, 12-Moving frame, 121-Guide groove, 13-Limiting frame, 14-Ratchet, 15-Second spring, 16-Ratchet, 17-Fan blade, 18-Brush assembly, 19-Third spring, 20-Floc storage tank, 21-Isolation net, 22-Bubble nozzle. Detailed Implementation

[0064] The above-described solution will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of this application. The implementation conditions used in the embodiments may be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are generally those in routine experiments.

[0065] Example 1

[0066] A sewage treatment device for a water conservancy project, such as Figures 1-3As shown, the system includes a sedimentation tank 1, a rotating outer cylinder 2, venturi tubes 3, a first pipe 303, a gas-liquid slip ring 304, a second pipe 305, a support and protection unit, a sealing and adjusting unit, a variable speed rotation unit, a stirring and rotating unit, and a flocculation and storage unit. The sedimentation tank 1 has a wastewater inlet at its upper part and a wastewater outlet at its lower part. The rotating outer cylinder 2 is movably installed at the bottom of the sedimentation tank 1, and can move up and down and rotate along the vertical axis within the sedimentation tank 1. Several venturi tubes 3 are circumferentially distributed and fixedly connected to the outer wall of the rotating outer cylinder 2. The sedimentation tank 3 has a flocculant inlet 301 and an air inlet 302. The air inlet 302 is located at the narrow end of the venturi tube 3, and the flocculant inlet 301 is located at the wider end of the venturi tube 3. The flocculant inlet 301 is connected to a first pipe 303. A gas-liquid slip ring 304 is fixedly installed at the bottom of the sedimentation tank 1. One end of the first pipe 303 is connected to the outlet of the gas-liquid slip ring 304. The inlet of the gas-liquid slip ring 304 is connected to an external flocculant pump through a first flexible hose (the first flexible hose and the flocculant pump are not shown in the figure), so that the gas-liquid slip ring 304 can... During the rotation of the first pipe 303, flocculant is continuously introduced into it. The air inlet 302 is connected to a second pipe 305, one end of which is connected to the air outlet of the gas-liquid slip ring 304. The air inlet of the gas-liquid slip ring 304 is connected to an external air pump via a second flexible hose (the second flexible hose and air pump are not shown in the diagram). This allows the gas-liquid slip ring 304 to continuously supply air into the second pipe 305 during its rotation, enabling the Venturi tube 3 to spray out flocculant filled with fine bubbles. The rotating outer cylinder 2 is equipped with... The outer cylinder 2 is equipped with a support and protection unit to support the venturi tube 3. The inner part of the outer cylinder 2 is equipped with a sealing adjustment unit to adjust the starting state of the venturi tube 3. The top of the inner part of the outer cylinder 2 is equipped with a variable speed rotation unit to drive the venturi tube 3 to rotate at different speeds. Several stirring and rotating units are provided on the outer wall of the outer cylinder 2 to mix wastewater and flocculant and drive the flocs to move towards the inner wall of the sedimentation tank 1. The inner wall of the sedimentation tank 1 is equipped with a flocculant storage unit to collect and store the flocs.

[0067] Among them, such as Figure 3 As shown, the support and protection unit is set inside the rotating outer cylinder 2 to support one end of the venturi tube 3 and prevent excessive local stress at the air inlet 302 of the venturi tube 3 from causing deformation and damage. The support and protection unit includes a support rod 4 and a rotating inner cylinder 5. Several support rods 4 are set inside the rotating outer cylinder 2. Several support rods 4 are fixedly connected to the rotating inner cylinder 5. The rotating inner cylinder 5 is fixedly connected to several venturi tubes 3 through a through-type connection.

[0068] Among them, such as Figures 4-6As shown, the sealing adjustment unit is located inside the rotating outer cylinder 2 and is used to adjust the starting state of the venturi tube 3. The sealing adjustment unit includes a cam column 6, a stepped sealing plug 7, and a first spring 8. The cam column 6 is rotatably connected inside the rotating inner cylinder 5. The bottom of the cam column 6 is fixedly connected to the bottom of the sedimentation tank 1. Several cam grooves 601 are opened on the outer wall of the cam column 6. The cam grooves 601 correspond to several venturi tubes 3 at the same height. The stepped sealing plug 7 is slidably connected inside the venturi tube 3. One end of the stepped sealing plug 7 contacts the cam groove 601. The first spring 8 is fixedly connected to the stepped surface of the stepped sealing plug 7. One end of the first spring 8 is fixedly connected to the inner end of the venturi tube 3.

[0069] Among them, such as Figures 3-4 and Figures 7-9 As shown, the variable speed rotation unit is located at the top of the inner part of the rotating outer cylinder 2, and is used to drive the Venturi tube 3 to rotate at a variable speed. This allows the Venturi tube 3 to spray more flocculant within a smaller range, enabling the flocculant to adsorb more suspended solids in the wastewater within a smaller range and combine with the suspended solids in the wastewater to form larger flocs, making it easier for workers to clean the flocs. The variable speed rotation unit includes a support shell 9, a motor 10, an eccentric disk 11, a moving frame 12, a limit frame 13, a ratchet rack 14, a second spring 15, and a ratchet 16. The top of the cam column 6 is fixed to the support shell 9, and the motor 10 is fixedly installed at the center of the support shell 9. The output shaft of the motor 10 passes through the support shell 9, and the eccentric disk 11 is fixedly connected to the output shaft of the motor 10. The moving frame 12 is movably mounted on the eccentric disk 11, and a horizontal groove is opened at the center of the moving frame 12. The eccentric shaft of the disc 11 is located inside the horizontal slide groove. The support shell 9 is symmetrically provided with limit frames 13. The top of the symmetrically provided limit frames 13 is slidably connected to the moving frame 12, which is used to limit the moving direction of the moving frame 12 and limit the angle when the moving frame 12 moves, so that the eccentric shaft of the eccentric disc 11 generates a sine wave along the limiting direction of the limit frame 13, so that the moving frame 12 can move at different speeds along the limiting direction of the limit frame 13 under the drive of the eccentric disc 11. The inner side of the moving frame 12 is provided with rectangular guide grooves 121. Two ratchet racks 14 are slidably provided in the two opposite guide grooves 121. Several second springs 15 are provided on one side of the ratchet rack 14. One end of several second springs 15 is fixedly connected to the moving frame 12. The top of the inner side of the rotating outer cylinder 2 is provided with a ratchet 16, which meshes with the ratchet rack 14.

[0070] In the initial state, the stepped sealing plug 7 is located at the protrusion of the cam groove 601, causing the cam groove 601 to squeeze the stepped sealing plug 7, thereby blocking the flocculant inlet 301 of the venturi tube 3 and causing the first spring 8 to be in a stretched state. When the device is working, the operator first introduces sewage into the sedimentation tank 1 through the sewage discharge inlet and starts the external air pump, which introduces air into the second hose. The air enters the air inlet of the gas-liquid slip ring 304 through the second hose and passes through the air outlet of the gas-liquid slip ring 304, causing the air to exit from the gas-liquid slip ring 304. The air outlet of ring 304 passes through the second pipe 305 and enters the venturi tube 3 through the air inlet 302. Then the air is ejected at the narrow end of the venturi tube 3, so that the narrow end of the venturi tube 3 is filled with air, preventing sewage from contaminating the inside of the venturi tube 3. In addition, the air enters the sewage in the sedimentation tank 1 and generates bubbles. The bubbles adhere to the hydrophobic suspended matter in the sewage through the surface tension of the sewage, thereby forming a bubble-suspended matter complex. The buoyancy of the bubbles causes the suspended matter to float to the water surface and form a scum layer, thus achieving the preliminary treatment of suspended matter in the sewage by the device.Subsequently, the staff started the external flocculant pump, which introduced flocculant through the first hose into the inlet of the gas-liquid slip ring 304. The flocculant then passed through the first pipe 303 from the outlet of the gas-liquid slip ring 304 to the flocculant inlet 301, where it was blocked by the outer wall of the stepped sealing plug 7. Simultaneously, the motor 10 was started, causing its output shaft to rotate and drive the eccentric disk 11 to rotate. The rotation of the eccentric disk 11, through its own eccentric shaft, drove the moving frame 12 to reciprocate along the top of the limiting frame 13. During this movement, the moving frame 12 moved along the ratchet mechanism. Strip 14 drives ratchet 16 to rotate counterclockwise, which in turn drives venturi tube 3 to rotate via outer cylinder 2. During rotation, venturi tube 3 drives stepped sealing plug 7 to rotate synchronously. Under the tension of the first spring 8, stepped sealing plug 7 slides on the surface of cam groove 601, causing the radius of its revolution around the axis of cam column 6 to continuously decrease. This allows stepped sealing plug 7 to slide within venturi tube 3, gradually disengaging from the flocculant inlet 301 of venturi tube 3, thus removing the obstruction to the flocculant and allowing it to flow from the narrow opening of venturi tube 3. As the flocculant flows out, its flow cross-sectional area gradually decreases at the narrow opening of the venturi tube 3. Since the flow time and volume of the flocculant remain constant, the flow velocity of the flocculant gradually increases at the narrow opening of the venturi tube 3. This high-speed flow of the flocculant at the narrow opening of the venturi tube 3 breaks up the airflow at the narrow opening of the venturi tube 3, transforming the airflow into fine bubbles. These fine bubbles mix with the flocculant and are ejected from the venturi tube 3. The fine bubbles allow the flocculant to be distributed more evenly in the wastewater, thus promoting the rapid flocculation of the flocculant into flocs in the wastewater. During the flocculation process, flocs adhere to suspended solids in wastewater, thus achieving the aggregation and treatment of suspended solids. Because the flocculant contains a large number of fine air bubbles, the flocs form a porous structure. This porous structure, through the fine air bubbles, reduces the density of the flocs. Under buoyancy, the flocs carry the suspended solids to the surface of the wastewater until the flocs float to the surface. The flocs also adhere to pollutants, which float on the surface, improving wastewater treatment efficiency and facilitating timely removal of pollutants adhering to the flocs, thereby preventing secondary pollution of the wastewater.

[0071] It is worth noting that the rotation of the eccentric disk 11 causes the eccentric shaft of the eccentric disk 11 to drive the moving frame 12 to move smoothly at different speeds along the limiting direction of the limiting frame 13. During the speed change, the moving frame 12 drives the ratchet 16 to rotate smoothly at different speeds through the ratchet rack 14. This causes the ratchet 16 to drive the venturi tube 3 to rotate smoothly at different speeds along the axis of the cam column 6 by rotating the outer cylinder 2. When the rotation speed of the venturi tube 3 slows down, the flocculant is sprayed out at the narrow end of the venturi tube 3 and gathers in the same space, thereby forming a larger volume of flocs. This makes the flocs easier to collect and clean, improving the removal efficiency of suspended solids in wastewater.

[0072] Among them, such as Figure 10 As shown, the device also includes a lower corrugated ring 101 and an upper corrugated ring 201. The lower corrugated ring 101 is fixedly connected to the bottom of the sedimentation tank 1, and the upper corrugated ring 201 is fixedly connected to the bottom of the rotating outer cylinder 2. The upper corrugated ring 201 and the lower corrugated ring 101 are in contact and cooperate, so that when the upper corrugated ring 201 rotates, it can drive the venturi tube 3 to move up and down through the rotating outer cylinder 2, thereby making the flocculant more evenly distributed in the sewage and improving the adhesion ability of the flocculant to the sewage.

[0073] During the rotation of the outer cylinder 2, the rotation of the outer cylinder 2 drives the upper wave ring 201 at the bottom to rotate synchronously, thereby causing the upper wave ring 201 to squeeze the lower wave ring 101 at its bottom. The upper wave ring 201 moves up and down along the wave surface of the lower wave ring 101, thereby causing the upper wave ring 201 to drive the outer cylinder 2 to move up and down synchronously. During the movement, the outer cylinder 2 drives the ratchet 16 to slide and contact the ratchet surface of the ratchet rack 14, and causes the outer cylinder 2 to drive the venturi tube 3 to move up and down. Thus, when the venturi tube 3 sprays flocculant, the spray range of the flocculant can cover the sewage between the upper and lower venturi tubes 3, thereby improving the adhesion efficiency of the flocculant to suspended solids during flocculation.

[0074] Among them, such as Figure 2 and Figure 11 As shown, the stirring and rotating unit is installed on the outer wall of the rotating outer cylinder 2. It is used to mix sewage and flocculant, so that the flocculant can fully adhere to the suspended solids in the sewage during the flocculation process. The stirring and rotating unit drives the flocs to flow with the vortex, so that the flocs move towards the inner wall of the sedimentation tank 1 by centrifugal force. The stirring and rotating unit includes fan blades 17, brush row 18 and third spring 19. Several fan blades 17 are installed on the outer circumference of the rotating outer cylinder 2 to stir the sewage and generate vortices. The vortex guides the flow of flocculant and flocs, so that the flocculant and flocs diffuse towards the inner wall of the sedimentation tank 1 by centrifugal force. A brush row 18 is slidably installed at one end of the fan blades 17. The brush row 18 is used to clean the inner wall of the sedimentation tank 1 and prevent the flocs from adhering to the inner wall of the sedimentation tank 1. A third spring 19 is installed at one end of the brush row 18, and one end of the third spring 19 is fixedly connected to the fan blades 17.

[0075] During the counterclockwise rotation of the outer cylinder 2, the fan blade 17 will also rotate counterclockwise synchronously. It is worth noting that since the fan blade 17 is C-shaped, its inner surface will more effectively push the sewage to generate vortices during the accelerated rotation. The vortex will cause the flocs to rotate coaxially along the axis of the cam column 6, and the flocs will gradually approach the inner wall of the sedimentation tank 1 under the action of centrifugal force during their own movement. This makes it easier for the staff to clean the flocs in the sedimentation tank 1 and improves the efficiency of the device. In addition, the rotation of the fan blade 17 causes the flocculant that has not yet been fully flocculated to flow with the vortex, thereby fully adhering to the suspended matter in the vortex. During the deceleration of the fan blade 17, the rotation speed of the fan blade 17 is slower than the flow speed of the vortex, so that the vortex bypasses the fan blade 17 along the outer surface of the fan blade 17, thereby reducing the loss of vortex flow velocity during the deceleration of the fan blade 17 and enabling the vortex to flow continuously and stably.

[0076] When the flocs move in the sewage and approach the inner wall of the sedimentation tank 1, they may adhere to the inner wall of the sedimentation tank 1. At this time, the fan blade 17 rotates and drives the brush row 18 to rotate synchronously. The third spring 19 squeezes the brush row 18 with elasticity, so that the brush row 18 cleans the flocs adhering to the inner wall of the sedimentation tank 1, thereby ensuring the cleanliness of the sedimentation tank 1.

[0077] Among them, such as Figures 1-2 As shown, the flocculation storage unit is installed on the inner wall of the sedimentation tank 1 to collect and store flocs. The collection and storage of flocs does not affect the operation of the device. The flocculation storage unit includes a floc storage tank 20 and an isolation net 21. The floc storage tanks 20 are arranged in a mirror image on the inner wall of the sedimentation tank 1. The floc storage tanks 20 are used to collect and store flocs. An isolation net 21 is installed at the connection between the floc storage tank 20 and the sedimentation tank 1. The isolation net 21 is used to prevent the flocs from being guided out of the floc storage tank 20 by the vortex.

[0078] When the flocs float on the surface of the wastewater, they move along the inner wall of the sedimentation tank 1 with the vortex. It is worth noting that the wastewater level is higher than the bottom of the floc storage tank 20, which causes the flocs to move with the flow of the vortex. Through the centrifugal force generated during their movement, they enter the floc storage tank 20 along the inner wall of the sedimentation tank 1. The flow of the vortex in the sedimentation tank 1 causes the wastewater in the floc storage tank 20 to flow in the same direction. This flow of wastewater in the floc storage tank 20 causes the flocs to move closer to the contact isolation net 21 and be intercepted by the isolation net 21. As a result, the flocs accumulate at the isolation net 21, and the wastewater flows back to the sedimentation tank 1 through the isolation net 21. This facilitates the centralized treatment of the flocs by the staff, thereby improving the efficiency of the staff in treating suspended solids. It also allows the staff to directly observe the surface of the wastewater, which helps in the observation of the wastewater quality. When the clarity of the wastewater meets the requirements of the subsequent processes, the staff discharges the wastewater from the sedimentation tank 1 through the wastewater discharge outlet of the sedimentation tank 1, completing the discharge of the treated wastewater from the sedimentation tank 1.

[0079] Among them, such as Figure 2 and Figure 12 As shown, the device also includes bubble nozzles 22. Bubble nozzles 22 are provided at the bottom of the sedimentation tank 1. There are several bubble nozzles 22, which are used to generate a large number of fine bubbles at the bottom of the sedimentation tank 1, thereby accelerating the speed at which flocs adhere to suspended solids in wastewater and accelerating the floating of flocs.

[0080] While the flocculant is being sprayed from the Venturi tube 3, the operator can also activate the bubble nozzle 22 to spray bubbles. The bubbles will contact and protect the flocs with their own surface and promote the rise of the flocs through buoyancy. On the other hand, they will adhere to the suspended solids in the sewage through their own surface, thereby further improving the sewage treatment efficiency. It is worth noting that although the bubbles will be broken up by the rotation of the fan blade 17 during the rise, the total volume of the bubbles does not change, so the buoyancy generated by the bubbles displacing the sewage does not change, allowing the bubbles to effectively carry the flocs to rise in the sewage.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A wastewater treatment device for a water conservancy project, comprising: a sedimentation tank (1); a rotating outer cylinder (2), wherein the rotating outer cylinder (2) is movably arranged at the bottom of the sedimentation tank (1); a Venturi tube (3), wherein a plurality of Venturi tubes (3) are arranged on the outer wall of the rotating outer cylinder (2), wherein the Venturi tubes (3) are provided with a flocculant inlet (301) and an air inlet (302); a first pipe (303), wherein the flocculant inlet (301) is connected to the first pipe (303); a gas-liquid slip ring (304), wherein the bottom of the sedimentation tank (1) is provided with a gas-liquid slip ring (304) connected to the first pipe (303); a second pipe (305), wherein the air inlet (302) is connected to the second pipe (305) connected to the gas-liquid slip ring (304); and a support and protection unit, wherein the rotating outer cylinder (2) is provided with a support and protection unit for supporting the Venturi tubes (3); A sealing adjustment unit is provided inside the rotating outer cylinder (2) for adjusting the starting state of the venturi tube (3); a variable speed rotation unit is provided at the top of the rotating outer cylinder (2) for driving the venturi tube (3) to rotate at a variable speed; a stirring rotation unit is provided on the outer wall of the rotating outer cylinder (2) for mixing sewage and flocculant; and a flocculation storage unit is provided on the inner wall of the sedimentation tank (1) for collecting and storing flocs. The support and protection unit includes: support rods (4), a plurality of support rods (4) are provided inside the rotating outer cylinder (2); rotating inner cylinder (5), a plurality of support rods (4) are fixedly connected to the rotating inner cylinder (5), and the rotating inner cylinder (5) is fixedly connected to a plurality of venturi tubes (3) through the cylinder. The sealing adjustment unit includes: a cam column (6), which is rotatably arranged inside the rotating inner cylinder (5), and is fixedly connected to the sedimentation tank (1). The outer wall of the cam column (6) is provided with a plurality of cam grooves (601), and the cam grooves (601) correspond to a plurality of Venturi tubes (3) at the same height; a stepped sealing plug (7), which is slidably arranged inside the Venturi tube (3), and one end of the stepped sealing plug (7) contacts the cam groove (601); and a first spring (8), which is provided on the stepped sealing plug (7), and one end of the first spring (8) is fixedly connected to the Venturi tube (3).

2. A sewage treatment device for a water conservancy project according to claim 1, characterized in that: The variable speed rotation unit includes: a support shell (9), which is provided on the top of the cam column (6); a motor (10), which is provided inside the support shell (9), and the output shaft of the motor (10) passes through the support shell (9); an eccentric disk (11), which is provided on the output shaft of the motor (10); a moving frame (12), which is movably provided on the eccentric disk (11), and a horizontal groove is provided at the center of the moving frame (12), and the eccentric shaft of the eccentric disk (11) is located inside the horizontal groove; and a limiting frame (13), which is symmetrically provided on the support shell (9), and the tops of the symmetrically provided limiting frames (13) are slidably connected to the moving frame (12).

3. A sewage treatment device for a water conservancy project according to claim 2, characterized in that: The variable speed rotation unit further includes: a ratchet rack (14), with guide grooves (121) rectangularly distributed on the inner side of the moving frame (12), and a ratchet rack (14) slidingly disposed in two opposite guide grooves (121); a second spring (15), with several second springs (15) disposed on one side of the ratchet rack (14), and one end of several second springs (15) fixedly connected to the moving frame (12); and a ratchet wheel (16), with a ratchet wheel (16) disposed at the top of the inner side of the rotating outer cylinder (2), and the ratchet wheel (16) meshing with the ratchet rack (14).

4. A wastewater treatment device for a water conservancy project according to claim 1, characterized in that: It also includes: a lower wave ring (101), which is fixedly connected to the bottom of the sedimentation tank (1); and an upper wave ring (201), which is fixedly connected to the bottom of the rotating outer cylinder (2), and the upper wave ring (201) is in contact with the lower wave ring (101).

5. A sewage treatment device for a water conservancy project according to claim 4, characterized in that: The stirring and rotating unit includes: fan blades (17), and a plurality of fan blades (17) are provided on the outer circumferential wall of the rotating outer cylinder (2).

6. A sewage treatment device for a water conservancy project according to claim 5, characterized in that: The stirring and rotating unit further includes: a brush row (18), on one end of the fan blade (17) where the brush row (18) is slidably disposed; and a third spring (19), on one end of the brush row (18) where a third spring (19) is disposed, and one end of the third spring (19) is fixedly connected to the fan blade (17).

7. A wastewater treatment device for a water conservancy project according to claim 1, characterized in that: The flocculation storage unit includes: a flocculation storage tank (20), which is mirror-distributed on the inner wall of the sedimentation tank (1), and is used to collect and store flocculated clumps; and an isolation net (21), which is provided at the connection between the flocculation storage tank (20) and the sedimentation tank (1), and is used to prevent flocculated clumps from being guided out of the flocculation storage tank (20) by vortex.

8. A sewage treatment device for a water conservancy project according to claim 1, characterized in that: It also includes: bubble nozzles (22), and several bubble nozzles (22) are provided at the bottom of the sedimentation tank (1).

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