Unpowered high-density sedimentation tank

Abstract

The utility model relates to the technical field of sewage treatment, and provides an unpowered high-density sedimentation tank which comprises a sludge multiplication tank and a sedimentation separation tank which are communicated with each other, the central lifting area is located in the pool body, and a gap is reserved between the central lifting area and the bottom wall of the pool body to form a water return opening; the density multiplication area is located in the pool 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 unpowered high-density sedimentation tank provided by the utility model, 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 utility model relates to the technical field of sewage treatment, in particular to an unpowered high-density sedimentation tank. Background Art

[0002] Energy sources in sewage treatment include electricity, heat, chemicals, clean water, etc., of which electricity consumption accounts for 60%-90%. Energy saving and consumption reduction, and reducing the addition of chemicals are carbon emission reduction. In the sewage treatment coagulation and sedimentation process, the preparation of high-density flocs can improve the water purification effect. However, the existing sewage treatment equipment uses coagulation, flocculation and sludge return to obtain high-density sludge flocs, especially sludge return needs to be completed with the help of power equipment, which consumes a lot of energy. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is that the existing sewage treatment device obtains high-density sludge flocs by coagulation, flocculation and sludge return, especially the sludge return needs to be completed with the help of electrical equipment, which has high energy consumption, so a non-powered high-density sedimentation tank is provided.

[0004] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0005] The utility model provides a non-powered high-density sedimentation tank, comprising: a sludge multiplication tank and a sedimentation separation tank body connected to each other; a central lifting zone, located in the tank body, a gap is left between the central lifting zone and the bottom wall of the tank body to form a water return port, and the water inlet of the central lifting zone is connected to an external water source; a density multiplication zone, located in the tank body and arranged along the circumference of the central lifting zone, the density multiplication zone includes a first annular channel, an ascending channel, an inner ring descending zone and a second annular channel arranged in sequence along the flow direction of the water body; the water inlet of the first annular channel is connected to the water outlet of the central lifting zone, and the second annular channel and the first annular channel converge at the entrance of the ascending channel; an annular water collection zone, located in the tank body and along the central The lifting zone is arranged circumferentially, and the outlet of the annular water collecting zone is connected with the sedimentation separation tank of the tank body; the outlet of the inner ring descending zone is divided into a first branch and a second branch, the first branch is connected with the water inlet of the annular water collecting zone, and the second branch is connected with the water inlet of the second annular channel; the water flowing out through the outlet of the central lifting zone enters the first annular channel, and flows out through the first annular channel into the rising channel to rise and further enter the inner ring descending zone to descend, and further flows out through the outlet of the inner ring descending zone to form the first branch and the second branch, the water flowing out through the second branch enters the second annular channel, and further merges with the water flowing out of the first annular channel and enters the rising channel.

[0006] Furthermore, a plurality of guide plates are arranged in an interlaced manner along the fluid direction of the water body in the inner ring descending zone.

[0007] Furthermore, a reflective plate is provided at the water outlet of the inner ring downward zone to guide the water body to flow toward the water inlet of the second annular channel, so that the water body changes from flowing downward to flowing upward.

[0008] Furthermore, the sludge multiplication tank also includes an external descending zone and a diversion zone; the external descending zone is located in the tank body and is arranged along the circumference of the density multiplication zone, and the water inlet of the external descending zone is connected with the water outlet of the central lifting zone; the diversion zone is located in the tank body and is arranged along the circumference of the density multiplication zone, and the water inlet of the diversion zone is connected with the water outlet of the external descending zone; the water outlet of the diversion zone is divided into a third branch and a fourth branch, the third branch is connected with the water inlet of the first annular channel, and the fourth branch is connected with the return water port.

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

[0010] Furthermore, the water outlet surface of the water outlet in the outer descending zone gradually decreases.

[0011] Furthermore, the sludge multiplication tank also includes a chamfered inclined plate, which is arranged at the bottom corner of the tank body, and the chamfered inclined plate is arranged toward the return water port to guide the water in the diversion area to flow back to the central lifting area.

[0012] Furthermore, the sludge multiplication tank also includes a nozzle and a water inlet pipe; the nozzle is arranged in the central lifting area; one end of the water inlet pipe is connected to the nozzle, and the other end is suitable for connecting to a water source outside the tank body, and the nozzle accelerates the water and sends it into the central lifting area.

[0013] Furthermore, the sludge multiplication tank also includes a reflux regulator, including a turntable, a reflux regulating hood and a connecting rod connecting the two; the turntable is located outside the tank body; the reflux regulating hood is located in the central lifting area and above the nozzle, and the reflux regulating hood is provided with a hollow hole, and the water in the nozzle enters the central lifting area through the hollow hole; a return water channel is formed between the reflux regulating hood and the central lifting area, and the return water channel is connected to the return water port, and the turntable drives the reflux regulating hood to rise or fall to adjust the channel cross-sectional area of ​​the return water channel, thereby adjusting the water return amount of the return water port.

[0014] The tank body further comprises an exhaust pipe, one end of which is connected to the intersection of the ascending channel and the inner ring descending zone, and the other end of which is connected to the central lifting zone.

[0015] Furthermore, the sedimentation and separation tank includes a mud layer filtration and sedimentation area, a downward channel and an inclined tube separation area arranged along the flow path of the water body; the water inlet of the mud layer filtration and sedimentation area is connected to the water outlet of the annular water collection area, and the water outlet of the inclined tube separation area is connected to the external environment; the high-density flocs formed in the sludge multiplication tank form a sludge suspension bed in the mud layer filtration and sedimentation area to purify the water body flowing through. The technical solution of the utility model has the following advantages:

[0016] The utility model provides a non-powered high-density sedimentation tank, including a connected sludge multiplication tank and a sedimentation separation tank. A density multiplication zone is set between the central lifting zone and the annular water collection zone on the flow path of the water body in the sludge multiplication tank, so that the water body circulates at high speed in the two channels of the ascending channel in the density multiplication zone and the inner ring descending zone, so that the collision between flocs and the collision between the reagent and the colloid are more frequent, which promotes the volume and density of the flocs and lays a good foundation for the sedimentation separation tank in the rear section. Moreover, high-density floc sludge can be obtained under the premise of omitting the conventional sludge return process, and there is no need to lead the sludge in the rear section back through the pipeline. It is easy to install and saves the power consumption of the pipe return, making the process more energy-efficient than before. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of an unpowered high-density sedimentation tank in one embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of a sludge multiplication tank in an unpowered high-density sedimentation tank in one embodiment of the utility model;

[0020] Figure 3 It is a schematic diagram of an unpowered high-density sedimentation tank in another embodiment of the utility model.

[0021] 1. Tank body; 2. Central lifting area; 3. Water return port; 4. First annular channel; 5. Ascending channel; 6. Inner ring descending area; 7. Second annular channel; 8. Annular water collection area; 9. Guide plate; 10. Reflector; 11. External descending area; 12. Diversion area; 13. Chamfered inclined plate; 14. Spray pipe; 15. Water inlet pipe; 16. Turntable; 17. Backflow regulating hood; 18. Connecting rod; 19. Backflow channel; 20. Sedimentation and separation tank; 21. Exhaust pipe; 22. Annular plate; 23. Guide hood; 24. Central ascending pipe; 25. Water outlet pipe; 26. Mud layer filtration and sedimentation area; 27. Downward channel; 28. Oblique pipe separation area; 29. ​​Sludge collection bucket; 30. Flow stabilizing plate. DETAILED DESCRIPTION

[0022] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figure 1 , Figure 2As shown, this embodiment provides an unpowered high-density sedimentation tank, which is a horizontal tank structure, including a sludge multiplication tank and a sedimentation separation tank 20 that are connected: the sludge multiplication tank includes: a tank body 1; a central lifting area 2, located in the tank body 1, a gap is left between the central lifting area 2 and the bottom wall of the tank body 1 to form a return water port 3, and the water inlet of the central lifting area 2 is connected to an external water source. For example, the central lifting area 2 can be formed by installing a central riser 24 in the tank body 1. Since the middle diameter of the central riser 24 is smaller than the diameter at the water inlet, the fluid will be accelerated, so that the air lift effect (Bernoulli principle) can be used to provide a continuous upward power to the channel water body; the density multiplication area , located in the pool body 1 and arranged along the circumference of the central lifting zone 2, the density multiplication zone includes a first annular channel 4, an ascending channel 5, an inner ring descending zone 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 with the water outlet of the central lifting zone 2, and the second annular channel 7 converges with the first annular channel 4 at the entrance of the ascending channel 5; the annular water collection zone 8 is located in the pool body 1 and arranged along the circumference of the central lifting zone 2, and the water outlet of the annular water collection zone 8 is connected with the sedimentation separation tank 20; the water outlet of the inner ring descending zone 6 is divided into a first branch and a second branch, the first branch is connected with the water inlet of the annular water collection zone 8, and the second branch is connected with the water inlet of the second annular channel 7. The water flowing out through the outlet of the central lifting area 2 enters the first annular channel 4, flows out through the first annular channel 4, enters the ascending channel 5 to rise, and further enters the inner ring descending area 6 to descend, and further flows out through the outlet of the inner ring descending area 6 to form the first branch and the second branch, and the water flowing out through the second branch enters the second annular channel 7, and further merges with the water flowing out of the first annular channel 4 and enters the ascending channel 5. For example, the formation of the density multiplication zone can be achieved by installing a density multiplication inner part in the pool body 1, wherein the density multiplication inner part can be composed of two annular plates 22, wherein the two annular plates 22 are both arranged along the circumference of the central ascending pipe 24, the area between the inner annular plate 22 and the central ascending pipe 24 is used to form the ascending channel 5, and the area between the two annular plates 22 is used to form the inner ring descending area 6. It should be noted that the inner annular plate 22 refers to the annular plate 22 that is closer to the center line of the central ascending pipe 24. The formation of the first annular channel 4 and the second annular channel 7 will be described in detail below. For example, an external water outlet pipe 25 can be connected to discharge the water in the annular water receiving area 8.

[0027] The non-powered high-density sedimentation tank provided in this embodiment includes a connected sludge multiplication tank and a sedimentation separation tank 20. A density multiplication zone is set between the central lifting zone 2 and the annular water collection zone 8 on the flow path of the water body in the sludge multiplication tank, so that the water body circulates at high speed in the two channels of the ascending channel 5 and the inner ring descending zone 6 in the density multiplication zone, so that the collision between flocs and the collision between the reagent and the colloid are more frequent, which promotes the volume and density of the flocs and lays a good foundation for the sedimentation separation tank 20 in the rear section. Moreover, high-density floc sludge can be obtained under the premise of omitting the conventional sludge return process, and there is no need to lead the sludge in the rear section back through the pipeline. It is easy to install and saves the power consumption of the pipe return, making the process more energy-efficient than before.

[0028] Among them, it should be noted that in the existing water treatment process, hydraulic or external power is used to return the sludge in the rear section to the front section, and the adsorption capacity of the sludge itself is used to increase the sludge density in the front section. However, the present application performs multiple internal circulations in the front section area to increase the sludge density.

[0029] Among them, a number of guide plates 9 are arranged in an interlaced manner along the fluid direction of the water body in the inner ring downward zone 6. For example, the guide plates 9 can be installed on the inner wall of the outer annular plate 22 and the outer wall of the inner annular plate 22, and each guide plate 9 can be arranged in the horizontal direction, and the area of ​​the guide plate 9 is smaller than the water outlet surface area of ​​the inner ring downward zone 6. In this way, when the water body in the inner ring downward zone 6 moves downward, it will collide with the guide plates 9, change speed and other turbulent effects, making the collision between flocs and the collision between the agent and the colloid more frequent, which promotes the volume and density of the flocs and is conducive to the generation of high-density flocs.

[0030] Among them, the water outlet of the inner ring downward zone 6 is provided with a reflective plate 10 to guide the water body to flow toward 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 zone 6, the end of the inner annular plate 22 can be provided with a folded edge inclined toward the direction of the outer annular plate 22, so that the diameter of the water outlet of the inner ring downward zone 6 is reduced, which can have an acceleration effect on the water body after the water is discharged. For example, the reflective plate 10 can be installed on the outer annular plate 22, and the direction of the reflective plate 10 can be parallel to the folded edge at the end of the inner annular plate 22, so as to better guide the water body obliquely upward into the second annular channel 7.

[0031] Among them, the sludge multiplication tank also includes an external descending zone 11 and a diversion zone 12; the external descending zone 11 is located in the tank body 1 and is arranged along the circumference of the density multiplication zone, and the water inlet of the external descending zone 11 is connected with the water outlet of the central lifting zone 2; the diversion zone 12 is located in the tank body 1 and is arranged along the circumference of the density multiplication zone, and the water inlet of the diversion zone 12 is connected with the water outlet of the external descending zone 11; the water outlet of the diversion zone 12 is divided into a third branch and a fourth branch, the third branch is connected with the water inlet of the first annular channel 4, and the fourth branch is connected with the return water port 3. For example, the formation of the diversion area 12 can be achieved by installing a guide cover 23 in the pool body 1. The guide cover 23 can be an inverted cone 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 small end of the guide cover 23 can be provided with an extension section parallel to the central riser 24, and the area between the extension 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 rest of the guide cover 23 and the central riser 24 forms the diversion area 12, and the water outlet surface of the diversion area 12 adapted to the water outlet of the first annular channel 4 can be gradually reduced, and the water body will be accelerated when entering the first annular channel 4 from the diversion area 12.

[0032] At the same time, the inner annular plate 22 and the folded edge at the end and the area between the deflector 23 and its extension form a second annular channel 7. At this time, the channel cross-sectional area of ​​the second annular channel 7 is gradually reduced along the direction of the water body, so that the water body can accelerate upward and merge with the water body from the first annular channel 4 and enter the ascending channel 5.

[0033] At the same time, the area between the deflector 23, the outer annular plate 22 and the inner wall of the pool body 1 forms an external descending zone 11, and the water outlet surface of the external descending zone 11 gradually decreases at this time, which can also accelerate the water entering the diversion zone 12 from the external descending zone 11.

[0034] For example, an annular water collecting plate may be provided at the bottom of the outer annular plate 22 along the circumferential direction, and the space between the annular water collecting plate and the air guide cover 23 serves as the annular water collecting area 8 .

[0035] The sludge multiplication tank further includes a chamfered inclined plate 13, which is arranged at the bottom corner of the tank body 1. The chamfered inclined plate 13 is arranged toward the water return port 3 to guide the water in the diversion area 12 to flow back to the central lifting area 2. Under the guidance of the chamfered inclined plate 13, a part of the water in the external descending area 11 can re-enter the central riser 24 through the water return port 3 of the reflux and mix with the water entering from the water inlet pipe 15 before ascending.

[0036] Among them, the sludge multiplication tank also 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 connected to the nozzle 14, and the other end is suitable for connecting to the water source outside the tank body 1. The nozzle 14 accelerates the water body and sends it into the central lifting area 2.

[0037] Among them, in the present application, water with several times the amount of water in the diversion area 12 flows back from the reflux port at the bottom of the central riser 24 due to the effect of the central drainage and mixes with the water at the outlet of the nozzle 14. Under the effect of the water inlet push flow, water with the same amount of water inflow rises and enters the first annular channel 4. In this process, the spatial cross-sectional area of ​​the diversion area 12 is large, and the amount of water rising into the first annular channel 4 is small, so the rising water will undergo sedimentation and separation, and the heavier flocs will sink and re-enter the central riser 24 for density. In this way, after the system has been running for a period of time, the sludge density of the water mixture rising into the first annular channel 4 will gradually increase until it reaches a relative equilibrium amount.

[0038] Among them, the sludge multiplication tank also includes a return regulator, including a rotating disk 16, a return regulating cover 17 and a connecting rod 18 connecting the two; the rotating disk 16 is located outside the tank body 1; the return regulating cover 17 is located in the central lifting area 2 and above the nozzle 14, and a hollow hole is provided on the return regulating cover 17, and the water in the nozzle 14 enters the central lifting area 2 through the hollow hole; a return water channel is formed between the return regulating cover 17 and the central lifting area 2, and the return water channel is connected to the return water port 3. The rotating disk 16 drives the return flow regulating cover 17 to rise or fall to adjust the channel cross-sectional area of ​​the return water channel, and then adjust the water return amount 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 as a structure with a gradually decreasing pipe diameter, and correspondingly, the return flow regulating cover 17 is also designed as a structure with a gradually decreasing cover diameter, so as to adapt to the shape of the central riser 24 and facilitate the passage of water. For example, the reflux regulating hood 17 has a vertical wing plate and oblique wing plates at both ends of the vertical wing plate, and hollow holes are opened on the plate surface of each wing plate to allow the water sprayed from the nozzle 14 to pass through. The interval between each wing plate and the central riser 24 is the reflux channel 19. When the reflux regulating hood 17 rises, the channel cross-sectional area of ​​the reflux channel 19 decreases, and the amount of water flowing back is reduced, while the amount of water entering the density multiplication zone increases. Conversely, when the reflux regulating hood 17 descends, the channel cross-sectional area of ​​the reflux channel 19 increases, and the amount of water flowing back is increased, while the amount of water entering the density multiplication zone decreases. With such a configuration, the amount of return water can be adjusted as needed, and the water in the diversion zone 12 can be reasonably distributed, so that human intervention and control of the process of generating high-density flocs in the density multiplication zone can be better achieved. For example, when the return water volume is reduced, the water flow in the density doubling zone increases. Under the same cross-section, the greater the flow, the higher the flow velocity, the more cycles, the greater the probability of particle collision and contact, and the sludge flocs will become larger and denser.

[0039] Among them, the sludge multiplication tank also includes an exhaust pipe 21, one end of which is connected to the intersection of the ascending 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 ascending pipe 24 can be folded outward and connected to the top of the outer annular plate 22, and the water flowing out of the central lifting area 2 can spread to the surroundings and pass over the top of the outer annular plate 22 to enter the outer descending area 11. For example, the exhaust pipe 21 can be arranged on the inner wall of the central ascending pipe 24 in the horizontal direction, and the exhaust pipe 21 penetrates the pipe wall of the central ascending pipe 24. The gas carried by the water in the ascending channel 5 hitting the central ascending pipe 24 at the top can be discharged from the exhaust pipe 21 to the central lifting area 2, preventing the internal air pressure of the ascending channel 5 from being too high, avoiding the water in the ascending channel 5 from being obstructed during the upward process, which is conducive to ensuring that the water circulates at a high speed between the ascending channel 5 and the inner ring descending area 6.

[0040] The sedimentation separation tank 20 includes a mud layer filter settling area 26, a downward channel 27 and an inclined tube separation area 28 arranged along the flow path of the water body; the water inlet of the mud layer filter settling area 26 is connected to the water outlet of the annular water collection area 8, and the water outlet of the inclined tube separation area 28 is connected to the external environment; the high-density flocs formed in the sludge multiplication tank form a sludge suspension bed in the mud layer filter settling area 26 to purify the water body flowing through. For example, a water flow guide plate can be set at the water inlet of the mud layer filter settling area 26, and the water flow guide plate is bent downward. After the water body in the annular water collection area 8 enters the mud layer filter settling area 26, the direction of the water body changes under the action of the water flow guide plate, and flows downward from the bottom of the mud layer filter settling area 26, which can reduce the impact of the water body when entering the water body. The high-density flocs carried in the water body can form a more stable sludge suspension bed in the mud layer filter settling area 26, which is conducive to improving the purification effect of the water body. The water body after being treated by the sludge suspension bed is released at the upper part of the mud layer filtration and sedimentation area 26 and enters the descending channel 27. Since the bottom of the descending channel 27 is a conical bottom, the water body can turn to flow upward under the guidance of the conical bottom after reaching the bottom of the descending channel 27. Since an inclined tube separator is provided in the inclined tube separation area 28, the water body can be further filtered and precipitated after flowing through the inclined tube separator. Since a water outlet weir is provided at the top of the inclined tube separation area 28, the clean water after filtration and sedimentation flows out of the non-powered high-density sedimentation tank from the outlet of the water outlet weir.

[0041] like Figure 1 As shown, a sludge collecting bucket 29 may be provided at the bottom of the inclined tube separation zone 28, and a portion of useless flocs may enter the sludge collecting bucket 29, and the sludge in the sludge collecting bucket 29 may be directly discharged through the sludge discharge pipe.

[0042] like Figure 3As shown, a flow stabilizer 30 can also be provided at the water inlet of the sludge collecting bucket 29. The flow stabilizer 30 has a gap. When the water carrying sludge enters the sludge collecting bucket 29 through the gap on the flow stabilizer 30, the water inlet can be made more stable, thereby preventing large turbulence from being generated in the inclined tube separation area 28, and making the water flow environment in the inclined tube separation area 28 more stable, which is beneficial to improving the treatment effect of the upper inclined tube separator and ensuring the clarity of the effluent.

[0043] 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 enters the inner ring descending area 6 after crossing over the top of the riser channel 5. When the water descends, the reflector 10 changes the direction of the water from downward to obliquely upward, which is conducive 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 sedimentation separation tank 20 through the outlet pipe 25.

[0044] In summary, in the non-powered high-density sedimentation tank of this application, the flocculent sludge is hydraulically refluxed inside the sludge multiplication tank without external power. Moreover, there is no need to lead the sludge back to the rear section 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] 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 of the utility model.

Claims

1. An unpowered high-density sedimentation tank, characterized in that: The invention comprises a sludge multiplication tank and a sedimentation separation tank (20) which are connected to each other. The sludge multiplication tank comprises: A pool body (1); a central lifting area (2) located in the pool body (1); a gap is left between the central lifting area (2) and the bottom wall of the pool body (1) to form a water return port (3); and a water inlet of the central lifting area (2) is connected to an external water source; a density multiplication zone, located in the pool body (1) and arranged along the circumference of the central lifting zone (2), the density multiplication zone comprising a first annular channel (4), an ascending channel (5), an inner ring descending zone (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 zone (2), and the second annular channel (7) and the first annular channel (4) converge at the inlet of the ascending channel (5); An annular water collection area (8) is located in the tank body (1) and is arranged along the circumference of the central lifting area (2), and the water outlet of the annular water collection area (8) is connected to the sedimentation separation tank (20) of the tank body (1); the water outlet of the inner ring descending area (6) is divided into a first branch and a second branch, wherein 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 flowing out through the water outlet of the central lifting area (2) enters the first annular channel (4), flows out through the first annular channel (4) into the ascending channel (5), ascends, 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, and the water flowing out through the second branch enters the second annular channel (7), and further merges with the water flowing out of the first annular channel (4) and enters the ascending channel (5).

2. The unpowered high-density sedimentation tank according to claim 1, characterized in that: The water outlet of the inner ring downward zone (6) is provided with a reflecting plate (10) to guide the water body to flow toward the water inlet of the second annular channel (7), so that the water body changes from flowing downward to flowing upward.

3. The unpowered high-density sedimentation tank according to any one of claims 1-2, characterized in that: The sludge multiplication tank further comprises an external descending area (11) and a diversion area (12); The outer descending zone (11) is located in the pool body (1) and is arranged along the circumference of the density multiplication zone, and the water inlet of the outer descending zone (11) is connected to the water outlet of the central lifting zone (2); The diversion zone (12) is located in the pool body (1) and is arranged along the circumference of the density multiplication zone, and the water inlet of the diversion zone (12) is connected to the water outlet of the external descending zone (11); the water outlet of the diversion zone (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 return water port (3).

4. The unpowered high-density sedimentation tank according to claim 3, characterized in that: The diversion area (12) is adapted to have a water outlet surface of the water outlet of the first annular channel (4) that gradually decreases.

5. The unpowered high-density sedimentation tank according to claim 3, characterized in that: The water outlet surface of the water outlet of the outer descending zone (11) gradually decreases.

6. The unpowered high-density sedimentation tank according to claim 3, characterized in that: The sludge multiplication tank further comprises a chamfered inclined plate (13) arranged at a bottom corner of the tank body (1), wherein the chamfered inclined plate (13) is arranged toward the water return port (3) to guide the water in the diversion area (12) to flow back to the central lifting area (2).

7. The unpowered high-density sedimentation tank according to claim 1, characterized in that: The sludge multiplication tank also includes a spray pipe (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 connected to the nozzle (14), and the other end is suitable for connecting to a water source outside the pool body (1). The nozzle (14) accelerates the water and then sends it into the central lifting area (2).

8. The unpowered high-density sedimentation tank according to claim 7, characterized in that: The sludge multiplication tank also includes a return flow regulator, including a rotating disk (16), a return flow regulating cover (17), and a connecting rod (18) connecting the two; The rotating disk (16) is located outside the pool body (1); The reflux regulating cover (17) is located in the central lifting area (2) and above the nozzle (14), and a hollow hole is provided on the reflux regulating cover (17), and the water in the nozzle (14) enters the central lifting area (2) through the hollow hole; A water return channel is formed between the reflux regulating cover (17) and the central lifting area (2), and the water return channel is connected to the water return port (3). The turntable (16) drives the reflux regulating cover (17) to rise or fall, so as to adjust the channel cross-sectional area of ​​the water return channel, thereby adjusting the water return amount of the water return port (3).

9. The unpowered high-density sedimentation tank according to claim 1, characterized in that: The sludge multiplication tank further comprises an exhaust pipe (21), one end of which is connected to the intersection of the ascending channel (5) and the inner ring descending zone (6), and the other end of which is connected to the central lifting zone (2).

10. The unpowered high-density sedimentation tank according to claim 1, characterized in that: The sedimentation and separation tank (20) comprises a mud layer filtering and settling area (26), a descending channel (27) and an inclined tube separation area (28) arranged along the flow path of the water body; The water inlet of the mud layer filtering and settling area (26) is connected to the water outlet of the annular water collecting area (8), and the water outlet of the inclined tube separation area (28) is connected to the external environment; The high-density flocs formed in the sludge multiplication tank form a sludge suspension bed in the mud layer filtration and sedimentation area (26) to purify the water flowing through it.

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