Sludge density multiplication device and sewage treatment device

Abstract

The invention relates to the technical field of sewage treatment, and provides a sludge density multiplication device and a sewage treatment device.The sludge density multiplication device comprises a main body; the central lifting area is located in the main body, and a gap is reserved between the central lifting area and the bottom wall of the main body to form a water return opening; the density multiplication area is located in the main body and arranged in the circumferential direction of the center lifting area, and the density multiplication area comprises a first annular channel, an ascending channel, an inner ring descending area and a second annular channel which are sequentially arranged in the flowing direction of the water body. According to the sludge density multiplication device provided by the invention, a water body is subjected to high-speed circulation in the ascending channel in the density multiplication area and the inner ring descending area, so that the collision between flocs and the collision between medicaments and colloids are more frequent, and the volume and the density of the flocs are increased. And moreover, the sludge at the rear section does not need to be led back through a pipeline, the installation is convenient, the power consumption of pipe backflow is saved, and the process is more energy-saving compared with the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly relates to a device for doubling sludge density and a sewage treatment device. Background Art

[0002] The energy in sewage treatment includes electric energy, heat energy, chemicals, clean water, etc., among which the electricity consumption accounts for 60%-90%. Energy conservation and consumption reduction, as well as reducing chemical dosing, are carbon emissions reduction. In the sewage treatment process, preparing high-density flocs can improve the purification effect of water quality. However, the existing sewage treatment devices use coagulation, flocculation, and sludge recirculation to obtain high-density sludge flocs. In particular, the sludge recirculation needs to be completed with the help of electrical equipment, resulting in high energy consumption. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is that the existing sewage treatment devices use coagulation, flocculation, and sludge recirculation to obtain high-density sludge flocs. In particular, the sludge recirculation needs to be completed with the help of electrical equipment, resulting in high energy consumption. Thus, a device for doubling sludge density and a sewage treatment device are provided.

[0004] To solve the above technical problem, the technical solution of the present invention is as follows:

[0005] The present invention provides a device for doubling sludge density, including: a main body; a central upward lifting area located inside the main body, with a gap left between the central upward lifting area and the bottom wall of the main body to form a water return port, and the water inlet of the central upward lifting area is connected to an external water source; a density doubling area located inside the main body and arranged circumferentially along the central upward lifting area, the density doubling area including a first annular channel, an upward channel, an inner ring downward area, and a second annular channel arranged in sequence along the flowing direction of the water body; the water inlet of the first annular channel is connected to the water outlet of the central upward lifting area, and the second annular channel converges with the first annular channel at the entrance of the upward channel; an annular water collection area located inside the main body and arranged circumferentially along the central upward lifting area, the water outlet of the annular water collection area is connected to the outside of the main body; the water outlet of the inner ring downward area is divided into a first branch and a second branch, the first branch is connected to the water inlet of the annular water collection area, and the second branch is connected to the water inlet of the second annular channel; the water flowing out from the water outlet of the central upward lifting area enters the first annular channel, flows out through the first annular channel and enters the upward channel to rise and further enters the inner ring downward area to descend, and further flows out through the water outlet of the inner ring downward area to form the first branch and the second branch. The water flowing out through the second branch enters the second annular channel, and further converges with the water flowing out from the first annular channel and then enters the upward channel.

[0006] Further, a plurality of guide plates are arranged at intervals and staggered along the fluid direction of the water body in the inner ring downward area.

[0007] Further, a reflector is arranged at the water outlet of the inner ring downward area to guide the water body to flow towards the water inlet of the second annular channel, so that the water body changes from flowing downward to flowing upward.

[0008] Further, the sludge density doubling device further includes an external downward area and a diversion area; the external downward area is located in the main body and is arranged along the circumference of the density doubling area, and the water inlet of the external downward area is communicated with the water outlet of the central lifting area; the diversion area is located in the main body and is arranged along the circumference of the density doubling area, and the water inlet of the diversion area is communicated with the water outlet of the external downward area; the water outlet of the diversion area is divided into a third branch and a fourth branch, the third branch is communicated with the water inlet of the first annular channel, and the fourth branch is communicated with the water return port.

[0009] Further, the water outlet surface of the diversion area adapted to the water outlet of the first annular channel gradually decreases.

[0010] Further, the water outlet surface of the external downward area gradually decreases.

[0011] Further, the sludge density doubling device further includes a chamfered inclined plate, which is arranged at the bottom corner position of the main body, and the chamfered inclined plate faces the water return port to guide the water body in the diversion area to flow back to the central lifting area.

[0012] Further, the sludge density doubling device further includes a spray pipe and a water inlet pipe; the spray pipe is arranged in the central lifting area; one end of the water inlet pipe is communicated with the spray pipe, and the other end is suitable for connecting a water source outside the main body, and the spray pipe accelerates the water body and then sends it into the central lifting area.

[0013] Further, the sludge density doubling device further includes a reflux regulator, which includes a turntable, a reflux regulating cover and a connecting rod connecting the two; the turntable is located outside the main body; the reflux regulating cover is located in the central lifting area and above the spray pipe, and the reflux regulating cover is provided with hollow holes, and the water body in the spray pipe enters the central lifting area through the hollow holes; a water return channel is formed between the reflux regulating cover and the central lifting area, and the water return channel is communicated with the water return port, and the turntable drives the reflux regulating cover to rise or fall to adjust the channel cross-sectional area of the water return channel, and further adjust the water body return flow of the water return port.

[0014] Furthermore, the sludge density doubling device further includes a lifting stirrer and a water inlet pipe; the execution end of the lifting stirrer extends into the central lifting area; one end of the water inlet pipe extends into the central lifting area and faces the execution end of the lifting stirrer, and the other end is adapted to be connected to a water source outside the main body, and the lifting stirrer drives the water body to rise in the central lifting area.

[0015] Furthermore, the sludge density doubling device further includes an exhaust pipe, one end of the exhaust pipe is connected to the intersection position of the rising channel and the inner ring descending area, and the other end is connected to the central lifting area.

[0016] On the other hand, the present invention also provides a sewage treatment device, including the sludge density doubling device described in any one of the above.

[0017] The technical solution of the present invention has the following advantages:

[0018] The sludge density doubling device provided by the present invention is provided with a density doubling area between the central lifting area and the annular water collection area along the flow path of the water body, so that the water body circulates at a high speed in two channels, namely the rising channel and the inner ring descending area in the density doubling area, making the collision between flocs and the collision between the reagent and the colloid more frequent, promoting the volume and density of the flocs, and laying a foundation for the subsequent separation. Moreover, on the premise of omitting the conventional sludge return process, high-density floc sludge can be obtained without introducing the sludge in the subsequent section through pipelines, which is convenient to install and saves the power consumption of the pipeline return, making the process more energy-saving than before. Description of the Drawings

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the sludge density doubling device in an embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of the sludge density doubling device in another embodiment of the present invention.

[0022] 1. Main body; 2. Central lifting area; 3. Water return port; 4. First annular channel; 5. Rising channel; 6. Inner ring downward area; 7. Second annular channel; 8. Annular water collection area; 9. Deflector; 10. Reflector; 11. External downward area; 12. Shunt area; 13. Chamfered inclined plate; 14. Nozzle; 15. Water inlet pipe; 16. Turntable; 17. Return flow regulating cover; 18. Connecting rod; 19. Return flow channel; 20. Lifting stirrer; 21. Exhaust pipe; 22. Annular plate member; 23. Deflecting cover; 24. Central rising pipe; 25. Water outlet pipe. Detailed implementation mode

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0024] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0026] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] Such as Figure 1As shown in the figure, this embodiment provides a sludge density doubling device, including: a main body 1. For example, the main body 1 can be a vertical tank-like structure; a central upward lifting area 2, which is located inside the main body 1. There is a gap between the central upward lifting area 2 and the bottom wall of the main body 1 to form a water return port 3. The water inlet of the central upward lifting area 2 is connected to an external water source. For example, the central upward lifting area 2 can be formed by installing a central rising pipe 24 inside the main body 1. Since the diameter of the middle part of the central rising pipe 24 is smaller than that at the water inlet, the fluid will accelerate, enabling a continuous upward power for the water in the channel by using the air-lift effect (Bernoulli's principle); a density doubling area, which is located inside the main body 1 and is arranged circumferentially along the central upward lifting area 2. The density doubling area includes a first annular channel 4, a rising channel 5, an inner ring downward area 6, and a second annular channel 7 arranged in sequence along the flow path of the water body; the water inlet of the first annular channel 4 is connected to the water outlet of the central upward lifting area 2, and the second annular channel 7 converges with the first annular channel 4 at the entrance of the rising channel 5; an annular water collection area 8, which is located inside the main body 1 and is arranged circumferentially along the central upward lifting area 2. The water outlet of the annular water collection area 8 is connected to the outside of the main body 1; the water outlet of the inner ring downward area 6 is divided into a first branch and a second branch. The first branch is connected to the water inlet of the annular water collection area 8, and the second branch is connected to the water inlet of the second annular channel 7. The water body flowing out from the water outlet of the central upward lifting area enters the first annular channel, flows out through the first annular channel and enters the rising channel to rise and further enters the inner ring downward area to descend, and further flows out through the water outlet of the inner ring downward area to form the first branch and the second branch. The water body flowing out through the second branch enters the second annular channel and further converges with the water body flowing out from the first annular channel and then enters the rising channel. For example, the density doubling area can be formed by installing density doubling internal components inside the main body 1. Among them, the density doubling internal components can be composed of two annular plate members 22. Among them, both annular plate members 22 are arranged circumferentially along the central rising pipe 24. The area between the inner annular plate member 22 and the central rising pipe 24 is used to form the rising channel 5, and the area between the two annular plate members 22 is used to form the inner ring downward area 6. It should be noted that the inner annular plate member 22 refers to the annular plate member 22 closer to the center line of the central rising pipe 24. Among them, the formation methods of the first annular channel 4 and the second annular channel 7 will be described in detail below. For example, an external water pipe 25 can be connected to lead out the water body in the annular water collection area 8.

[0028] The sludge density doubling device provided in this embodiment is provided with a density doubling area between the central lifting area 2 and the annular water collection area 8 along the water flow path of the water body, so that the water body circulates at a high speed in the two channels of the upward channel 5 and the inner ring downward area 6 in the density doubling area, making the collisions between flocs and the collisions between the medicament and the colloid more frequent, promoting the volume and density of the flocs, and laying a foundation for the subsequent separation. Moreover, on the premise of omitting the conventional sludge return process, high-density floc sludge can be obtained without introducing the sludge in the subsequent section through pipelines, which is convenient to install and saves the power consumption of pipeline return, making the process more energy-saving than before.

[0029] It should be noted that in the existing water treatment process, hydraulic or external power is used to return the sludge in the subsequent section to the previous section, and the adsorption capacity of the sludge itself is used to increase the sludge density in the previous section. However, in this application, multiple internal circulations are carried out in the previous section area to increase the sludge density.

[0030] A number of guide plates 9 are arranged at intervals and staggered along the fluid direction of the water body in the inner ring downward area 6. For example, the guide plates 9 can be installed on the inner wall of the outer annular plate member 22 and on the outer wall of the inner annular plate member 22. Each guide plate 9 can be arranged horizontally, and the area of the guide plate 9 is smaller than the water outlet area of the inner ring downward area 6. With such a setting, when the water body in the inner ring downward area 6 flows downward, it will collide with the guide plates 9 and cause turbulence such as speed change, making the collisions between flocs and the collisions between the medicament and the colloid more frequent, promoting the volume and density of the flocs, and being beneficial to the generation of high-density flocs.

[0031] A reflecting plate 10 is arranged at the water outlet of the inner ring downward area 6 to guide the water body to flow towards the water inlet of the second annular channel 7, so that the water body changes from flowing downward to flowing upward. For example, at the water outlet position of the inner ring downward area 6, the end of the inner annular plate member 22 can be provided with a folded edge inclined towards the outer annular plate member 22, so as to reduce the diameter of the water outlet of the inner ring downward area 6 and accelerate the water body after water outlet. For example, the reflecting plate 10 can be installed on the outer annular plate member 22, and the trend of the reflecting plate 10 can be parallel to the folded edge at the end of the inner annular plate member 22 to better guide the water body to enter the second annular channel 7 obliquely upward.

[0032] Among them, the sludge density doubling device further includes an external downward area 11 and a diversion area 12; the external downward area 11 is located inside the main body 1 and is arranged along the circumferential direction of the density doubling area, and the water inlet of the external downward area 11 is communicated with the water outlet of the central upward area 2; the diversion area 12 is located inside the main body 1 and is arranged along the circumferential direction of the density doubling area, and the water inlet of the diversion area 12 is communicated with the water outlet of the external downward area 11; the water outlet of the diversion area 12 is divided into a third branch and a fourth branch, the third branch is communicated with the water inlet of the first annular channel 4, and the fourth branch is communicated with the water return port 3. For example, the formation of the diversion area 12 can be achieved by installing a guide cover 23 inside the main body 1. The guide cover 23 can be of an inverted conical structure as a whole. The small end of the guide cover 23 faces upward and is sleeved on the outer periphery of the central riser 24. The extended section parallel to the central riser 24 can be arranged at the small end of the guide cover 23. The area between the extended section of the small end of the guide cover 23 and the central riser 24 can form the first annular channel 4. The area between the remaining part of the cover body of the guide cover 23 and the central riser 24 forms the diversion area 12, and the water surface of the water outlet of the diversion area 12 adapted to the first annular channel 4 can gradually decrease, and the water body will be accelerated when entering the first annular channel 4 from the diversion area 12.

[0033] Meanwhile, the area between the inner annular plate member 22 and the folded edge at the end and the guide cover 23 and its extended section forms the second annular channel 7. At this time, the cross-sectional area of the second annular channel 7 gradually decreases along the direction of the water body, so that the water body can accelerate upward and converge with the water body from the first annular channel 4 and then enter the upward channel 5.

[0034] Meanwhile, the area between the guide cover 23, the outer annular plate member 22 and the inner wall of the main body 1 forms the external downward area 11, and at this time, the water surface of the water outlet of the external downward area 11 gradually decreases, and the water body entering the diversion area 12 from the external downward area 11 can also be accelerated.

[0035] For example, an annular water collecting plate can be arranged along the circumference at the bottom of the outer annular plate member 22, and the space between the annular water collecting plate and the guide cover 23 is used as the annular water collecting area 8.

[0036] Among them, the sludge density doubling device further includes a chamfered inclined plate 13, which is arranged at the bottom corner position of the main body 1, and the chamfered inclined plate 13 faces the water return port 3 to guide the water body in the diversion area 12 to flow back to the central upward area 2. Part of the water body in the external downward area 11 can re-enter the central riser 24 through the water return port 3 of the return flow and be mixed with the water body entering from the water inlet pipe 15 and then rise upward.

[0037] Wherein, the sludge density doubling device further includes a nozzle 14 and a water inlet pipe 15; the nozzle 14 is arranged in the central lifting area 2; one end of the water inlet pipe 15 is communicated with the nozzle 14, and the other end is adapted to be connected to a water source outside the main body 1, and the nozzle 14 accelerates the water body and then sends it into the central lifting area 2.

[0038] Wherein, in this application, the water with several times the inflow in the diversion area flows back from the return port at the lower part of the central riser due to the action of central drainage and is mixed with the water body at the water outlet of the nozzle. Under the action of the inlet water pushing flow, the water with the same inflow rises into the first annular channel. In this process, the cross-sectional area of the diversion area is relatively large, and the amount of water rising into the first annular channel is small. Therefore, sedimentation separation will occur in the rising water body, and the heavier flocs will sink and re-enter the central riser to be densified. After the system operates for a period of time, the sludge density of the water mixture rising into the first annular channel will also gradually increase until a relatively balanced amount.

[0039] Wherein, the sludge density doubling device further includes a return flow regulator, which includes a turntable 16, a return flow regulating cover 17 and a connecting rod 18 connecting the two; the turntable 16 is located outside the main body 1; the return flow regulating cover 17 is located in the central lifting area 2 and above the nozzle 14. The return flow regulating cover 17 is provided with hollow holes, and the water body in the nozzle 14 enters the central lifting area 2 through the hollow holes; a return water channel is formed between the return flow regulating cover 17 and the central lifting area 2, and the return water channel is communicated with the return water port 3. The turntable 16 drives the return flow regulating cover 17 to rise or fall to adjust the cross-sectional area of the return water channel, and further adjust the water return flow of the return water port 3. For example, the pipe section where the water inlet of the central riser 24 is located can be designed to have a gradually decreasing pipe diameter. Correspondingly, the return flow regulating cover 17 is also designed to have a gradually decreasing cover body diameter, so as to be adapted to the shape of the central riser and facilitate the passage of the water body. For example, the return flow regulating cover 17 has vertical wing plates and inclined wing plates at both ends of the vertical wing plates. Hollow holes are provided on the plate surfaces of each wing plate to allow the water body sprayed by the nozzle 14 to pass through. The interval between each wing plate and the central riser 24 is the return water channel 19. When the return flow regulating cover 17 rises, the cross-sectional area of the return water channel 19 decreases, and at this time the amount of returned water body decreases, and the amount of water body entering the density doubling area increases. On the contrary, when the return flow regulating cover 17 descends, the cross-sectional area of the return water channel 19 increases, and at this time the amount of returned water body increases, and the amount of water body entering the density doubling area decreases. Such a setting can adjust the water return amount as needed, reasonably distribute the water body in the diversion area 12, and can better artificially intervene and control the process of generating high-density flocs in the density doubling area. For example, when the water return amount is adjusted to be smaller, the water flow rate in the density doubling area increases. Under the same cross-section condition, the greater the flow rate, the higher the flow velocity and the more the circulation times, and the greater the probability of particle collision and contact, and the sludge flocs will become larger and denser.

[0040] Such asFigure 2 As shown, in one embodiment, the sludge density doubling device further includes a lifting stirrer 20 and a water inlet pipe 15; the execution end of the lifting stirrer 20 extends into the central lifting area 2; one end of the water inlet pipe 15 extends into the central lifting area 2 and faces the execution end of the lifting stirrer 20, and the other end is adapted to be connected to a water source outside the main body 1, and the lifting stirrer 20 drives the water body to rise in the central lifting area 2. Among them, the execution end of the lifting stirrer 20 can be an impeller, and the position of the impeller is higher than the water outlet of the water inlet pipe 15. With such a setting, the rotation of the impeller of the lifting stirrer 20 can be used to drive the water body inside the central lifting area 2 to rise.

[0041] Among them, the sludge density doubling device further includes an exhaust pipe 21. One end of the exhaust pipe 21 is connected to the intersection position of the rising channel 5 and the inner ring descending area 6, and the other end is connected to the central lifting area 2. For example, the top of the central riser 24 can be turned outwards and connected to the top of the outer annular plate 22. The water body flowing out of the central lifting area 2 can diffuse around and cross the top of the outer annular plate 22 and enter the outer descending area 11. For example, the exhaust pipe 21 can be arranged horizontally on the inner wall of the central riser 24, and the exhaust pipe 21 penetrates the pipe wall of the central riser 24. The gas carried by the water body hitting the central riser 24 at the top in the rising channel 5 can be discharged from the exhaust pipe 21 to the central lifting area 2, preventing the air pressure inside the rising channel 5 from being too large, avoiding obstacles to the upward movement of the water body in the rising channel 5, and being beneficial to ensuring the high-speed circulation of the water body between the rising channel 5 and the inner ring descending area 6.

[0042] When in use: water enters from the water inlet pipe 15 and is released from the nozzle 14 at an accelerated speed. At the same time, under the action of the Bernoulli principle, the refluxed water enters the central lifting area 2 together with the water in the nozzle 14, is released at the enlarged opening at the top of the central lifting area 2, and then enters the external descending area 11. When the water descends to the bottom, the guide cover 23 disperses the water to the surroundings. Since the reflux is in the center, the deflection can extend the water's path and increase the residence time. In addition, the guide cover 23 changes the water flow section, plays a role in speed change, and enhances the mixing effect. The water flow section between the slope of the chamfered inclined plate 13 and the guide cover 23 becomes smaller, and the lower part of the chamfered inclined plate 13 extends toward the return water port 3 of the central riser 24, which is conducive to the reflux guidance. Most of the water in the diversion area 12 enters the central riser due to the internal circulation, and the continuous water inflow pushes the rest of the water into the first annular channel 4. Since the cross-sectional area of ​​the first annular channel 4 is reduced, the flow rate of the water increases after it is released upward. Under the action of the Bernoulli principle, the water in the second annular channel 7 will participate in the water inflow and enter the riser channel 5. Due to the increase in water volume, the flow rate increases, and the water flows over the top of the riser channel 5 and enters the inner ring descending area 6. When the water descends, the reflector 10 changes the direction of the water from downward to obliquely upward, which is beneficial to the drainage of the first annular channel 4. Due to the thrust of the inflow, the excess water will bypass the reflector 10 and enter the annular water collection area 8, and the water will be introduced into the downstream process section through the outlet pipe 25.

[0043] Another embodiment also provides a sewage treatment device, comprising any of the above-mentioned sludge density multiplying devices.

[0044] In summary, in the sludge density multiplying device and sewage treatment device of the present application, the flocculent sludge is refluxed hydraulically inside the multiplying device without external power. Moreover, there is no need to lead the sludge in the rear section back through the pipeline, which is easy to install and saves the power consumption of the pipe reflux, which is more energy-saving than before.

[0045] The sludge density multiplying device and sewage treatment device in the present application can be used not only for separation of high-density flocs in coagulation, but also for production and screening of high-quality granular sludge in the aerobic section, thereby increasing the treatment load of the aerobic section and saving investment in the subsequent sedimentation tank.

[0046] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A device for doubling the sludge density, characterized in that, Comprising: A main body (1); A central lifting area (2) located within the main body (1), with a gap left between the central lifting area (2) and the bottom wall of the main body (1) to form a water return port (3), and the water inlet of the central lifting area (2) is connected to an external water source; A density doubling area located within the main body (1) and arranged circumferentially along the central lifting area (2), the density doubling area includes a first annular channel (4), a rising channel (5), an inner ring descending area (6), and a second annular channel (7) arranged in sequence along the flow direction of the water body; the water inlet of the first annular channel (4) is connected to the water outlet of the central lifting area (2), and the second annular channel (7) converges with the first annular channel (4) at the entrance of the rising channel (5); An annular water collection area (8) located within the main body (1) and arranged circumferentially along the central lifting area (2), the water outlet of the annular water collection area (8) is connected to the outside of the main body (1); the water outlet of the inner ring descending area (6) is divided into a first branch and a second branch, where the first branch is connected to the water inlet of the annular water collection area (8), and the second branch is connected to the water inlet of the second annular channel (7); The water body flowing out from the water outlet of the central lifting area (2) enters the first annular channel (4), flows out through the first annular channel (4) and enters the rising channel (5) to rise and further enters the inner ring descending area (6) to descend, and further flows out through the water outlet of the inner ring descending area (6) to form the first branch and the second branch. The water body flowing out through the second branch enters the second annular channel (7), and further converges with the water body flowing out from the first annular channel (4) and then enters the rising channel (5); A plurality of guide plates (9) are arranged at intervals and staggered along the fluid direction of the water body within the inner ring descending area (6).

2. The sludge density doubling device according to claim 1, characterized in that A reflecting plate (10) is arranged at the water outlet of the inner ring descending area (6) to guide the water body to flow towards the water inlet of the second annular channel (7), so that the water body changes from flowing downward to flowing upward.

3. The sludge density doubling device according to any one of claims 1-2, characterized in that It further includes an external descending area (11) and a diversion area (12); The external descending area (11) is located within the main body (1) and arranged circumferentially along the density doubling area, and the water inlet of the external descending area (11) is connected to the water outlet of the central lifting area (2); The diversion area (12) is located within the main body (1) and arranged circumferentially along the density doubling area, and the water inlet of the diversion area (12) is connected to the water outlet of the external descending area (11); the water outlet of the diversion area (12) is divided into a third branch and a fourth branch, the third branch is connected to the water inlet of the first annular channel (4), and the fourth branch is connected to the water return port (3).

4. The sludge density doubling device according to claim 3, characterized in that The water outlet surface of the diversion area (12) is adapted to gradually decrease at the water outlet of the first annular channel (4).

5. The sludge density doubling device according to claim 3, characterized in that The water outlet surface of the water outlet of the external downward area (11) gradually decreases.

6. The sludge density doubling device according to claim 3, characterized in that It further includes a chamfered inclined plate (13) arranged at the bottom corner position of the main body (1), and the chamfered inclined plate (13) faces the water return port (3) to guide the water body in the diversion area (12) to flow back to the central upward area (2).

7. The sludge density doubling device according to claim 1, characterized in that It further includes a spray pipe (14) and a water inlet pipe (15); The spray pipe (14) is arranged in the central upward area (2); One end of the water inlet pipe (15) is communicated with the spray pipe (14), and the other end is adapted to be connected to a water source outside the main body (1), and the spray pipe (14) accelerates the water body and then sends it into the central upward area (2).

8. The sludge density doubling device according to claim 7, characterized in that It further includes a reflux regulator, including a turntable (16), a reflux adjustment cover (17) and a connecting rod (18) connecting the two; The turntable (16) is located outside the main body (1); The reflux adjustment cover (17) is located in the central upward area (2) and above the spray pipe (14), and the reflux adjustment cover (17) is provided with hollow holes, and the water body in the spray pipe (14) enters the central upward area (2) through the hollow holes; A water return channel is formed between the reflux adjustment cover (17) and the central upward area (2), and the water return channel is communicated with the water return port (3), and the turntable (16) drives the reflux adjustment cover (17) to rise or fall to adjust the channel cross-sectional area of the water return channel, and further adjust the water body return flow of the water return port (3).

9. The sludge density doubling device according to claim 1, characterized in that It further includes a lifting stirrer (20) and a water inlet pipe (15); The execution end of the lifting stirrer (20) extends into the central upward area (2); One end of the water inlet pipe (15) extends into the central upward area (2) and faces the execution end of the lifting stirrer (20), and the other end is adapted to be connected to a water source outside the main body (1), and the lifting stirrer (20) drives the water body to rise in the central upward area (2).

10. The sludge density doubling device according to claim 1, characterized in that It further includes an exhaust pipe (21), one end of the exhaust pipe (21) is connected to the intersection position of the ascending channel (5) and the inner ring downward area (6), and the other end is connected to the central upward area (2).

11. A sewage treatment device, characterized in that, It includes the sludge density doubling device according to any one of claims 1-10.

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