Sludge density multiplication device and sewage treatment device
By setting up a density multiplication zone in the wastewater treatment device and using hydraulic circulation to enhance floc collision, the problem of high energy consumption in existing wastewater treatment devices is solved, and high-density flocs are obtained while energy consumption is reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING PROVIRIDIA TECH CO LTD
- Filing Date
- 2023-12-27
- Publication Date
- 2026-06-02
Smart Images
Figure CN120208382B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of wastewater treatment technology, specifically to a sludge density multiplication device and a wastewater treatment device. Background Technology
[0002] Energy consumption in wastewater treatment includes electricity, heat, chemicals, and clean water, with electricity accounting for 60%–90% of the total. Energy conservation, emission reduction, and reduced chemical dosage are key to carbon reduction. In wastewater treatment processes, producing high-density flocs can improve water purification. However, existing wastewater treatment equipment uses coagulation, flocculation, and sludge recirculation to obtain high-density sludge flocs. Sludge recirculation, in particular, requires 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 existing sewage treatment devices use coagulation, flocculation and sludge return to obtain high-density sludge flocs. In particular, sludge return requires the use of electrical equipment, which consumes a lot of energy. Therefore, the present invention provides a sludge density multiplication device and a sewage treatment device.
[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:
[0005] This invention provides a sludge density multiplier device, comprising: a main body; a central lifting zone located within the main body, wherein a gap is left between the central lifting zone and the bottom wall of the main body to form a return water inlet, and the inlet of the central lifting zone is connected to an external water source; a density multiplier zone located within the main body and arranged circumferentially along the central lifting zone, the density multiplier zone including a first annular channel, an ascending channel, an inner annular descending zone, and a second annular channel arranged sequentially along the flow direction of the water; the inlet of the first annular channel is connected to the outlet of the central lifting zone, and the second annular channel and the first annular channel converge at the inlet of the ascending channel; and an annular water collection zone located within the main body and arranged circumferentially along the central lifting zone. The outlet of the annular water collection area is connected to the outside of the main body; the outlet of the inner ring downward area is divided into a first branch and a second branch. The first branch is connected to the inlet of the annular water collection area, and the second branch is connected to the inlet of the second annular channel. The water flowing out of the outlet of the central lifting area enters the first annular channel, flows out of the first annular channel and enters the rising channel, rises, and further enters the inner ring downward area, descends, and further flows out of the outlet of the inner ring downward area to form the first branch and the second branch. The water flowing out of the second branch enters the second annular channel, and further merges with the water flowing out of the first annular channel before entering the rising channel.
[0006] Furthermore, several guide vanes are arranged at intervals along the fluid direction of the water body within the inner ring downward zone.
[0007] Furthermore, the outlet of the inner ring downward zone is equipped with a reflector to guide the water to flow toward the inlet of the second annular channel, so that the water changes from downward flow to upward flow.
[0008] Furthermore, the sludge density multiplier device also includes an external downward flow zone and a diversion zone; the external downward flow zone is located within the main body and is arranged circumferentially along the density multiplier zone, and the inlet of the external downward flow zone is connected to the outlet of the central lifting zone; the diversion zone is located within the main body and is arranged circumferentially along the density multiplier zone, and the inlet of the diversion zone is connected to the outlet of the external downward flow zone; the outlet of the diversion zone is divided into a third branch and a fourth branch, the third branch is connected to the inlet of the first annular channel, and the fourth branch is connected to the return water outlet.
[0009] Furthermore, the outlet surface of the diversion zone adapted to the outlet of the first annular channel gradually decreases.
[0010] Furthermore, the outlet surface of the water outlet in the external downstream zone gradually decreases.
[0011] Furthermore, the sludge density multiplier also includes a chamfered inclined plate, which is located at the bottom corner of the main body. The chamfered inclined plate is positioned towards the return water inlet to guide the water in the diversion zone back to the central lifting zone.
[0012] Furthermore, the sludge density multiplier also includes a spray pipe and a water inlet pipe; the spray pipe is located in the central lifting zone; one end of the water inlet pipe is connected to the spray pipe, and the other end is adapted to connect to a water source outside the main body; the spray pipe accelerates the water and sends it into the central lifting zone.
[0013] Furthermore, the sludge density multiplier also includes a reflux regulator, comprising a turntable, a reflux regulating hood, and a connecting rod connecting the two; the turntable is located outside the main body; the reflux regulating hood is located within the central lifting zone and above the nozzle, and the reflux regulating hood is provided with perforations, through which water from the nozzle enters the central lifting zone; a return water channel is formed between the reflux regulating hood and the central lifting zone, and the return water channel is connected to the return water inlet; the turntable drives the reflux regulating hood to rise or fall to adjust the cross-sectional area of the return water channel, thereby adjusting the water return flow rate at the return water inlet.
[0014] Furthermore, the sludge density multiplier also includes an upward-lifting agitator and a water inlet pipe; the actuating end of the upward-lifting agitator extends into the central upward-lifting zone; one end of the water inlet pipe extends into the central upward-lifting zone and faces the actuating end of the upward-lifting agitator, and the other end is adapted to connect to a water source outside the main body; the upward-lifting agitator drives the water to rise within the central upward-lifting zone.
[0015] Furthermore, the sludge density multiplier also includes an exhaust pipe, one end of which is connected to the intersection of the rising channel and the inner ring descending zone, and the other end is connected to the central lifting zone.
[0016] On the other hand, the present invention also provides a wastewater treatment apparatus, including the sludge density multiplication device described in any of the above claims.
[0017] The technical solution of this invention has the following advantages:
[0018] The sludge density multiplier device provided by this invention sets up a density multiplier zone between the central lifting zone and the annular water collection zone along the water flow path. This allows the water to circulate at high speed in two channels within the density multiplier zone: the rising channel and the inner ring descending channel. This results in more frequent collisions between flocs and between the reagent and the colloid, increasing the volume and density of the flocs and laying a solid foundation for subsequent separation. Moreover, it can obtain high-density flocculent sludge without the need for conventional sludge recirculation processes. It eliminates the need to return sludge to the downstream stage via pipelines, making installation convenient and saving the power consumption of pipe recirculation, thus making the process more energy-efficient than before. Attached Figure Description
[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of a sludge density multiplication device in one embodiment of the present invention;
[0021] Figure 2 This is a schematic diagram of a sludge density multiplication device in another embodiment of the present invention.
[0022] 1. Main body; 2. Central lifting zone; 3. Return water inlet; 4. First annular channel; 5. Rising channel; 6. Inner annular downward zone; 7. Second annular channel; 8. Annular water collection zone; 9. Guide plate; 10. Reflector plate; 11. External downward zone; 12. Diversion zone; 13. Chamfered inclined plate; 14. Spray pipe; 15. Inlet pipe; 16. Turntable; 17. Return flow regulating cover; 18. Connecting rod; 19. Return flow channel; 20. Lifting agitator; 21. Exhaust pipe; 22. Annular plate; 23. Guide plate; 24. Central rising pipe; 25. Outlet pipe. Detailed Implementation
[0023] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0026] Furthermore, 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.
[0027] like Figure 1As shown, this embodiment provides a sludge density multiplier device, including: a main body 1, for example, the main body 1 can be a vertical tank-like structure; a central lifting zone 2, located inside the main body 1, with a gap between the central lifting zone 2 and the bottom wall of the main body 1 to form a return water inlet 3, and the inlet of the central lifting zone 2 connected to an external water source, for example, the central lifting zone 2 can be formed inside the main body 1 by installing a central riser pipe 24. Since the diameter of the central riser pipe 24 in the middle is smaller than the diameter at the inlet, the fluid will be accelerated, so that the air lift effect (Bernoulli's principle) can be used to give the channel water a continuous upward force; and a density multiplier zone, located inside the main body 1 and raised along the center. The circumferential arrangement of Zone 2 includes a 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 sequentially along the water flow path. The inlet of the first annular channel 4 is connected to the outlet of the central lifting zone 2, and the second annular channel 7 and the first annular channel 4 converge at the entrance of the ascending channel 5. The annular water collection zone 8 is located within the main body 1 and is arranged circumferentially along the central lifting zone 2. The outlet of the annular water collection zone 8 is connected to the outside of the main body 1. The outlet of the inner ring descending zone 6 is divided into a first branch and a second branch. The first branch is connected to the inlet of the annular water collection zone 8, and the second branch is connected to the inlet of the second annular channel 7. Water flowing out of the outlet of the central lifting zone enters the first annular channel, flows out of the first annular channel, rises in the rising channel, and further enters the inner ring descending zone, where it flows out through the outlet of the inner ring descending zone to form the first branch and the second branch. Water flowing out of the second branch enters the second annular channel and further merges with water flowing out of the first annular channel before entering the rising channel. For example, the density multiplication zone can be formed by installing a density multiplication internal component inside the main body 1. The density multiplication internal component can be composed of two annular plates 22, both of which are arranged circumferentially along the central rising pipe 24. The area between the inner annular plate 22 and the central rising pipe 24 forms the rising channel 5, and the area between the two annular plates 22 forms the inner ring descending zone 6. It should be noted that the inner annular plate 22 refers to the annular plate 22 closer to the centerline of the central rising pipe 24. 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 outlet pipe 25 can be connected to drain the water from the annular water collection area 8.
[0028] The sludge density multiplier device provided in this embodiment sets up a density multiplier zone between the central lifting zone 2 and the annular water collection zone 8 along the water flow path. This allows the water to circulate at high speed in the two channels within the density multiplier zone: the rising channel 5 and the inner ring descending channel 6. This results in more frequent collisions between flocs and between the reagent and the colloid, increasing the volume and density of the flocs and laying a good foundation for subsequent separation. Moreover, it can obtain high-density flocculent sludge without the need for conventional sludge recirculation processes. It eliminates the need to return sludge to the downstream stage via pipelines, making installation convenient and saving the power consumption of pipe recirculation, thus making the process more energy-efficient than before.
[0029] It should be noted that existing water treatment processes use hydraulic or external power to return sludge from the downstream section to the upstream section, utilizing the sludge's own adsorption capacity to increase the sludge density in the upstream section. However, this application involves multiple internal circulations in the upstream section to increase the sludge density.
[0030] Within the inner ring downstream zone 6, several guide plates 9 are spaced and staggered along the fluid flow direction of the water. For example, guide plates 9 can be installed on the inner wall of the outer annular plate 22 and on the outer wall of the inner annular plate 22. Each guide plate 9 can be arranged horizontally, and the area of the guide plate 9 is smaller than the outlet surface area of the inner ring downstream zone 6. This arrangement ensures that when the water in the inner ring downstream zone 6 flows downwards, it will collide with the guide plates 9, causing turbulence and velocity changes. This results in more frequent collisions between flocs and between the agent and the colloid, increasing the volume and density of the flocs and promoting the formation of high-density flocs.
[0031] The outlet of the inner ring downward flow zone 6 is equipped with a reflector plate 10 to guide the water flow towards the inlet of the second annular channel 7, thus changing the water flow from downward to upward. For example, at the outlet of the inner ring downward flow zone 6, the end of the inner annular plate 22 can be provided with a folded edge that slopes towards the outer annular plate 22, thereby reducing the diameter of the outlet of the inner ring downward flow zone 6 and accelerating the water flow after it exits. For example, the reflector plate 10 can be installed on the outer annular plate 22, and the direction of the reflector 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 to enter the second annular channel 7 at an angle upward.
[0032] The sludge density multiplier device also includes an external downflow zone 11 and a diversion zone 12. The external downflow zone 11 is located inside the main body 1 and is arranged circumferentially along the density multiplier zone. The inlet of the external downflow zone 11 is connected to the outlet of the central lifting zone 2. The diversion zone 12 is located inside the main body 1 and is arranged circumferentially along the density multiplier zone. The inlet of the diversion zone 12 is connected to the outlet of the external downflow zone 11. The outlet of the diversion zone 12 is divided into a third branch and a fourth branch. The third branch is connected to the inlet of the first annular channel 4, and the fourth branch is connected to the return water inlet 3. For example, the diversion zone 12 can be formed by installing a flow guide shroud 23 inside the main body 1. The flow guide shroud 23 can be an inverted cone shape, with its small opening facing upwards and fitted around the outer periphery of the central riser pipe 24. The small opening of the flow guide shroud 23 can have an extension parallel to the central riser pipe 24. The area between the extension of the small opening of the flow guide shroud 23 and the central riser pipe 24 can form the first annular channel 4. The remaining part of the flow guide shroud 23 and the area between it and the central riser pipe 24 form the diversion zone 12, and the outlet surface of the diversion zone 12 adapted to the first annular channel 4 can gradually decrease, so that the water is accelerated when it enters the first annular channel 4 from the diversion zone 12.
[0033] Meanwhile, the area between the inner annular plate 22 and the end flange and the guide shroud 23 and its extension forms a 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, allowing the water body to accelerate upward and merge with the water body from the first annular channel 4 before entering the rising channel 5.
[0034] At the same time, the area between the guide shroud 23, the outer annular plate 22 and the inner wall of the main body 1 forms the outer downflow zone 11. Furthermore, the water outlet surface of the outer downflow zone 11 gradually decreases, which can also accelerate the water entering the diversion zone 12 from the outer downflow zone 11.
[0035] For example, an annular water collection plate can be provided circumferentially at the bottom of the outer annular plate 22, and the space between the annular water collection plate and the guide shroud 23 serves as the annular water collection area 8.
[0036] The sludge density multiplier device also includes a chamfered inclined plate 13, which is located at the bottom corner of the main body 1. The chamfered inclined plate 13 is positioned towards the return water inlet 3 to guide the water in the diversion zone 12 back to the central lifting zone 2. Under the guidance of the chamfered inclined plate 13, a portion of the water in the external downward zone 11 can re-enter the central riser pipe 24 through the return water inlet 3 and mix with the water entering from the inlet pipe 15 before rising.
[0037] The sludge density multiplier device also includes a nozzle 14 and an inlet pipe 15. The nozzle 14 is located in the central lifting zone 2. One end of the inlet pipe 15 is connected to the nozzle 14, and the other end is adapted to connect to a water source outside the main body 1. The nozzle 14 accelerates the water and sends it into the central lifting zone 2.
[0038] In this application, water with a flow rate several times that of the diversion zone flows back from the return port at the bottom of the central riser pipe due to the central drainage effect, mixing with the water at the nozzle outlet. Under the propulsive force of the inflow, water of the same flow rate rises into the first annular channel. During this process, the cross-sectional area of the diversion zone is relatively large, while the volume of water rising into the first annular channel is small. Therefore, sedimentation and separation occur in the rising water, with heavier flocs settling and re-entering the central riser pipe for densification. Thus, after the system has been running for a period of time, the sludge density of the water mixture rising into the first annular channel will gradually increase until a relative equilibrium is reached.
[0039] The sludge density multiplier device also includes a reflux regulator, comprising a turntable 16, a reflux regulating hood 17, and a connecting rod 18 connecting the two. The turntable 16 is located outside the main body 1. The reflux regulating hood 17 is located within the central lifting zone 2 and above the nozzle 14. The reflux regulating hood 17 has perforations, through which water from the nozzle 14 enters the central lifting zone 2. A return water channel is formed between the reflux regulating hood 17 and the central lifting zone 2, and the return water channel is connected to the return water inlet 3. The turntable 16 drives the reflux regulating hood 17 to rise or fall, thereby adjusting the cross-sectional area of the return water channel and thus adjusting the water return flow rate at the return water inlet 3. For example, the pipe section where the inlet of the central riser pipe 24 is located can be designed with a gradually decreasing pipe diameter. Correspondingly, the reflux regulating hood 17 is also designed with a gradually decreasing hood diameter, thus adapting to the shape of the central riser pipe and facilitating water passage. For example, the reflux regulating hood 17 has vertical wing plates and inclined wing plates at both ends of the vertical wing plates. Each wing plate has perforated holes to allow water ejected from the nozzle 14 to pass through. The interval between each wing plate and the central riser pipe 24 forms the reflux channel 19. When the reflux regulating hood 17 rises, the cross-sectional area of the reflux channel 19 decreases, resulting in a decrease in the amount of water refluxed and an increase in the amount of water entering the density multiplication zone. Conversely, when the reflux regulating hood 17 falls, the cross-sectional area of the reflux channel 19 increases, resulting in a larger amount of water refluxed and a smaller amount of water entering the density multiplication zone. This configuration allows for adjustment of the return water volume as needed, enabling reasonable distribution of water within the diversion zone 12 and better human intervention and control of the high-density floc formation process in the density multiplication zone. For example, when the return water volume is reduced, the water flow rate in the density multiplication zone increases. Under the same cross-sectional conditions, the larger the flow rate, the higher the flow velocity, the more cycles, and the greater the probability of particle collision and contact, resulting in larger and denser sludge flocs.
[0040] like Figure 2 As shown, in one embodiment, the sludge density multiplier device further includes an upward-lifting agitator 20 and a water inlet pipe 15; the actuating end of the upward-lifting agitator 20 extends into the central upward-lifting zone 2; one end of the water inlet pipe 15 extends into the central upward-lifting zone 2 and faces the actuating end of the upward-lifting agitator 20, and the other end is adapted to connect to a water source outside the main body 1. The upward-lifting agitator 20 drives the water to rise within the central upward-lifting zone 2. The actuating end of the upward-lifting agitator 20 can be an impeller, with the impeller positioned higher than the outlet of the water inlet pipe 15. This configuration allows the impeller rotation of the upward-lifting agitator 20 to drive the water within the central upward-lifting zone 2 to rise.
[0041] The sludge density multiplier also includes an exhaust pipe 21. One end of the exhaust pipe 21 is connected to the intersection of the ascending channel 5 and the inner ring descending zone 6, and the other end is connected to the central lifting zone 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. Water flowing out of the central lifting zone 2 can spread outward and pass over the top of the outer annular plate 22 into the outer descending zone 11. For example, the exhaust pipe 21 can be set horizontally on the inner wall of the central ascending pipe 24 and penetrate the pipe wall of the central ascending pipe 24. The gas carried by the water in the ascending channel 5 when it hits the central ascending pipe 24 at the top can be discharged from the exhaust pipe 21 to the central lifting zone 2, preventing excessive air pressure inside the ascending channel 5 and avoiding obstruction of the water in the ascending channel 5 during its upward movement. This helps to ensure high-speed circulation of water between the ascending channel 5 and the inner ring descending zone 6.
[0042] In operation: Water enters through inlet pipe 15 and is rapidly released from nozzle 14. Simultaneously, under Bernoulli's principle, the returning water, along with the water in nozzle 14, enters the central lifting zone 2, where it is released through a widened opening at the top, and then enters the outer descending zone 11. As the water descends to the bottom, the guide shroud 23 disperses it to the surrounding area. Because the return flow is in the center, the deflection extends the water's path and increases its residence time. Furthermore, the guide shroud 23 alters the water flow cross-section, thus slowing the flow and enhancing the mixing effect. The cross-section between the chamfered inclined plate 13 and the guide shroud 23 is reduced, and the lower part of the chamfered inclined plate 13 extends towards the return port 3 of the central riser pipe 24, facilitating the guidance of the return flow. Most of the water in the diversion zone 12 enters the central riser due to internal circulation. The continuous inflow pushes the remaining water into the first annular channel 4. Because the cross-sectional area of the first annular channel 4 is smaller, the water velocity increases after being released upwards. Under Bernoulli's principle, the water in the second annular channel 7 participates in the inflow into the riser channel 5. Due to the increased water volume and velocity, the water flows over the top of the riser channel 5 and enters the inner annular descending zone 6. As the water descends, the reflector plate 10 changes the water direction from downwards to obliquely upwards, facilitating the diversion of the first annular channel 4. Due to the thrust of the incoming water, excess water bypasses the reflector plate 10 and enters the annular water collection zone 8, from where it is channeled into the downstream process section through the outlet pipe 25.
[0043] Another embodiment also provides a wastewater treatment apparatus, including the sludge density multiplier device of any of the above.
[0044] In summary, the sludge density multiplier and wastewater treatment device of this application allow the flocculent sludge to flow back hydraulically within the multiplier without external power. Furthermore, there is no need to return the sludge from the downstream section via pipelines, making installation convenient and eliminating the power consumption of pipeline return, resulting in greater energy savings compared to previous methods.
[0045] The sludge density multiplier device and wastewater treatment device in this application can be used not only for the separation of high-density flocs from coagulation, but also for the production and screening of high-quality granular sludge in the aerobic stage, thereby increasing the treatment load of the aerobic stage and saving investment in the downstream sedimentation tank.
[0046] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.
Claims
1. A sludge density multiplication device, characterized by include: Main body (1); The central lifting area (2) is located inside the main body (1). There is a gap between the central lifting area (2) and the bottom wall of the main body (1) to form a return water inlet (3). The water inlet of the central lifting area (2) is connected to an external water source. The density multiplication zone is located within the main body (1) and is arranged circumferentially along 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 sequentially along the flow direction of the water body. The inlet of the first annular channel (4) is connected to the outlet of the central lifting zone (2), and the second annular channel (7) and the first annular channel (4) converge at the entrance of the ascending channel (5). The annular water collection area (8) is located inside the main body (1) and is arranged around the central lifting area (2). The outlet of the annular water collection area (8) is connected to the outside of the main body (1). The 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 inlet of the annular water collection area (8), and the second branch is connected to the inlet of the second annular channel (7). Water flowing out of the outlet of the central lifting zone (2) enters the first annular channel (4), flows out of the first annular channel (4) and enters the rising channel (5) to rise and further enter the inner ring descending zone (6) to descend, and further flows out through the outlet of the inner ring descending zone (6) to form the first branch and the second branch. Water flowing out of the second branch enters the second annular channel (7), and further merges with the water flowing out of the first annular channel (4) before entering the rising channel (5). Several guide plates (9) are staggered along the fluid direction of the water body in the inner ring downward zone (6). The central lifting area (2) is formed by installing a central riser pipe (24) inside the main body (1). The diameter of the central riser pipe (24) in the middle is smaller than the diameter at the inlet. The density multiplication zone is formed by installing a density multiplication inner component inside the main body (1). The density multiplication inner component consists of two annular plates (22). Both annular plates (22) are arranged along the circumference of the central riser tube (24). The area between the inner annular plate (22) and the central riser tube (24) is used to form the rising channel (5), and the area between the two annular plates (22) is used to form the inner ring descending zone (6). The inner annular plate (22) refers to the annular plate (22) that is closer to the center line of the central riser tube (24). The outlet of the inner ring downward zone (6) is equipped with a reflector plate (10) to guide the water to flow toward the inlet of the second ring channel (7) so that the water changes from downward flow to upward flow. At the outlet position of the inner ring downward zone (6), the end of the inner ring plate (22) is provided with a folded edge that is inclined toward the outer ring plate (22). A flow guide (23) is installed inside the main body (1). The flow guide (23) has an inverted cone shape. The small end of the flow guide (23) faces upward and is fitted around the outer periphery of the central riser pipe (24). The small end of the flow guide (23) has an extension section parallel to the central riser pipe (24). The area between the extension section of the small end of the flow guide (23) and the central riser pipe (24) forms a first annular channel (4). The area between the inner annular plate (22) and the end flange and the shroud (23) and its extension forms a second annular channel (7).
2. The sludge density multiplier device according to claim 1, characterized in that, It also includes the external downlink zone (11) and the diversion zone (12); The external downward zone (11) is located inside the main body (1) and is arranged circumferentially along the density multiplication zone. The inlet of the external downward zone (11) is connected to the outlet of the central lifting zone (2). The diversion zone (12) is located within the main body (1) and is arranged circumferentially along the density multiplication zone. The inlet of the diversion zone (12) is connected to the outlet of the external downflow zone (11). The outlet of the diversion zone (12) is divided into a third branch and a fourth branch. The third branch is connected to the inlet of the first annular channel (4), and the fourth branch is connected to the return water inlet (3).
3. The sludge density multiplier device according to claim 2, characterized in that, The outlet surface of the diversion zone (12) adapted to the outlet of the first annular channel (4) gradually decreases.
4. The sludge density multiplier device according to claim 2, characterized in that, The outlet surface of the external downstream zone (11) gradually decreases.
5. The sludge density multiplier device according to claim 2, characterized in that, It also includes a chamfered inclined plate (13), which is set at the bottom corner of the main body (1). The chamfered inclined plate (13) is set towards the return water inlet (3) to guide the water in the diversion zone (12) back to the central lifting zone (2).
6. The sludge density multiplier device according to claim 1, characterized in that, It also includes a nozzle (14) and a water inlet pipe (15); The nozzle (14) is located within the central lifting area (2); One end of the water inlet pipe (15) is connected to the nozzle (14), and the other end is adapted to connect to a water source outside the main body (1). The nozzle (14) accelerates the water and sends it into the central lifting area (2).
7. The sludge density multiplier device according to claim 6, characterized in that, It also includes a reflux regulator, comprising a turntable (16), a reflux regulating shroud (17), and a connecting rod (18) connecting the two. The turntable (16) is located outside the main body (1); The reflux regulating hood (17) is located in the central lifting area (2) and above the nozzle (14). The reflux regulating hood (17) is provided with a perforated hole, through which the water in the nozzle (14) enters the central lifting area (2). A return water channel is formed between the return flow regulating hood (17) and the central lifting area (2). The return water channel is connected to the return water inlet (3). The turntable (16) drives the return flow regulating hood (17) to rise or fall to adjust the cross-sectional area of the return water channel, thereby adjusting the water return flow rate of the return water inlet (3).
8. The sludge density multiplier device according to claim 1, characterized in that, It also includes a lift-up agitator (20) and a water inlet pipe (15); The actuating end of the lifting stirrer (20) extends into the central lifting zone (2); One end of the water inlet pipe (15) extends into the central lifting zone (2) and faces the execution end of the lifting agitator (20), while the other end is adapted to connect to a water source outside the main body (1). The lifting agitator (20) drives the water to rise within the central lifting zone (2).
9. The sludge density multiplier device according to claim 1, characterized in that, It also includes an exhaust pipe (21), one end of which is connected to the intersection of the rising channel (5) and the inner ring descending area (6), and the other end is connected to the central lifting area (2).
10. A sewage treatment apparatus characterised by The sludge density multiplier includes any one of claims 1-9.