A sludge thickening device

Abstract

The application provides a sludge concentration device, which comprises an outer cylinder, an inner cylinder, a flow guide assembly and a flow assisting device; the inner cylinder is located in the outer cylinder, and the outer side wall of the inner cylinder and the inner side wall of the outer cylinder combine to form a cyclone space; the flow guide assembly comprises a plurality of first flow guide pieces and a plurality of second flow guide pieces; the plurality of first flow guide pieces are distributed on the inner side wall of the outer cylinder along the circumference of the outer cylinder, and the first flow guide pieces are arranged obliquely along the inner side wall of the outer cylinder; the plurality of second flow guide pieces are distributed on the inner side wall of the inner cylinder along the circumference of the inner cylinder, and the second flow guide pieces are arranged obliquely along the inner side wall of the inner cylinder; the top of the inner cylinder is lower than the top of the outer cylinder, the bottom of the inner cylinder is provided with a baffle, a gap is left between the baffle and the bottom of the inner cylinder, and the flow assisting device is used for pushing the solution to flow into the cyclone space from bottom to top. According to the application, other power sources are not needed, resources are saved, the device has a simple structure, is convenient to operate and has strong applicability.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, particularly relates to a sludge concentration device. BACKGROUND

[0002] The organic sewage produced by human production and life must be treated to reach the standard before being discharged. The organic sewage treatment method can be divided into physical method, chemical method and biological method according to its principle, because the biological method has low cost and good effect, the biological treatment method is most commonly used in sewage treatment plants.

[0003] The activated sludge method and its derived process in the biological treatment method are widely used in sewage treatment plants. In the activated sludge method and its derived process, the sludge is often kept in a suspended state in water by stirring or aeration, and the removal of pollutants in sewage is realized by the metabolic action of active microorganisms. In this system, the sludge will grow more and more, and in order to maintain high efficiency, part of the sludge often needs to be discharged.

[0004] In the membrane bioreactor process (MBR), the sludge discharge method is to directly extract the sludge-water mixture from the MBR reactor, and then concentrate the sludge to reduce the sludge volume. At this time, the concentration of the sludge directly extracted from the MBR reactor is consistent with the concentration of the sludge in the MBR reactor, the sludge concentration is relatively small, the water content is more, the sludge extraction system has large power consumption, and the subsequent sludge compression workload is large. SUMMARY

[0005] Based on this, the purpose of the present application is to provide a sludge concentration device to solve the problems in the prior art.

[0006] To achieve the above purpose, the present application provides a sludge concentration device, comprising an outer cylinder, an inner cylinder and a flow guide assembly.

[0007] The inner cylinder is located in the outer cylinder, the inner cylinder is connected with the outer cylinder through a connecting frame, the cavity of the inner cylinder is communicated with the cavity of the outer cylinder, and the outer side wall of the inner cylinder and the inner side wall of the outer cylinder combine to form a cyclone space.

[0008] The flow guide assembly comprises a plurality of first flow guide pieces and a plurality of second flow guide pieces, the plurality of first flow guide pieces are distributed on the inner side wall of the outer cylinder along the circumference of the outer cylinder, and the first flow guide pieces are inclinedly arranged along the inner side wall of the outer cylinder, the plurality of second flow guide pieces are distributed on the inner side wall of the inner cylinder along the circumference of the inner cylinder, and the second flow guide pieces are inclinedly arranged along the inner side wall of the inner cylinder.

[0009] The top of the inner cylinder is lower than the top of the outer cylinder, the bottom of the inner cylinder is provided with a baffle, a gap is left between the baffle and the opening of the bottom of the inner cylinder, the baffle is located in the outer cylinder, and the sludge concentration device further comprises a flow assisting device, which is used for pushing the solution to flow into the cyclone space from bottom to top.

[0010] The sludge-water mixture enters the outer cylinder and flows upward through the flow assisting device, and under the action of the first flow guide piece, the sludge-water mixture can form a spiral upward flow state in the cyclone space, so that the sludge concentration of the inner ring of the outer cylinder is higher than that of the outer ring, thereby realizing the primary concentration operation of the sludge in the sludge-water mixture; when the sludge-water mixture rises to the height of the connecting frame, the sludge-water mixture with the inner ring sludge concentration enters the inner cylinder and flows downward, and under the action of the second flow guide piece, the sludge-water mixture in the inner cylinder forms a spiral downward flow state, and at this time, the sludge concentration of the inner ring in the inner cylinder is higher than that of the outer ring, thereby realizing the secondary concentration operation of the sludge in the sludge-water mixture.

[0011] Preferably, the included angle between the first flow guide piece and the horizontal plane is 30°-75°.

[0012] Preferably, the top of the outer cylinder is provided with an adjustable weir plate, and the adjustable weir plate is used for adjusting the water discharge of the outer cylinder.

[0013] Preferably, the bottom of the outer cylinder is provided with a horn-shaped structure, and the opening area of the end of the horn-shaped structure away from the outer cylinder is greater than the opening area of the outer cylinder.

[0014] Preferably, the bottom of the inner cylinder is provided with a circular truncated cone structure, the opening area of the upper end of the circular truncated cone structure is the same as the opening area of the inner cylinder, and the opening area of the lower end of the circular truncated cone structure is smaller than the opening area of the inner cylinder.

[0015] Preferably, the end of the circular truncated cone structure away from the inner cylinder is connected with the baffle through a receiving rod.

[0016] Preferably, the circular truncated cone structure is provided with a blocking plate, and the blocking plate and the inner side wall of the circular truncated cone structure form a sludge bucket.

[0017] Preferably, the circular truncated cone structure and the outer cylinder are respectively provided with a first perforation and a second perforation, the first perforation is in communication with the sludge bucket, and one end of a row of sludge pipes passes through the second perforation and the first perforation in sequence and is in communication with the sludge bucket.

[0018] Preferably, the inner part of the outer cylinder is hollow to form a first accommodating cavity, and the inner cylinder and the connecting frame are located in the first accommodating cavity.

[0019] Preferably, the baffle forms a conical space, and the tangent plane of the side wall of the baffle is arranged to be inclined outward and upward from the center of the inner cylinder.

[0020] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A sectional view of the sludge concentration device provided by an embodiment of the present application;

[0022] Figure 2 A structural schematic view of the connecting frame, the inner cylinder and the hopper provided by an embodiment of the present application;

[0023] Figure 3 A structural schematic view of the sludge concentration device provided by an embodiment of the present application;

[0024] Figure 4 A line graph of the total nitrogen concentration changing with time in one specific embodiment of the sludge concentration device provided by an embodiment of the present application;

[0025] Figure 5 A line graph of the total nitrogen concentration changing with time in another specific embodiment of the sludge concentration device provided by an embodiment of the present application.

[0026] Explanation of main element symbols:

[0027] 10, outer cylinder; 11, cyclone space; 12, adjustable weir plate; 13, horn structure; 20, inner cylinder; 21, baffle; 22, circular truncated cone structure; 23, blocking plate; 24, hopper; 25, first perforation; 31, first guide vane; 32, second guide vane; 40, connecting frame; 50, sludge discharge pipe.

[0028] The following specific embodiments will further illustrate the present application in combination with the above-mentioned drawings. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The drawings show several embodiments of the present application. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0030] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein the terms "vertical", "horizontal", "left", "right" and similar terms are used for explanation purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0032] Please refer to Figures 1 to 3 The sludge concentration device in the embodiment of the application comprises an outer cylinder 10, an inner cylinder 20 and a flow guide assembly.

[0033] The first accommodating cavity is formed in the inner portion of the outer cylinder 10 and penetrates through opposite ends of the outer cylinder 10. The inner cylinder 20 is located in the first accommodating cavity. The top of the inner cylinder 20 is connected to the top of the outer cylinder 10 through a connecting frame 40. The connecting frame 40 is located in the first accommodating cavity. The outer sidewall of the inner cylinder 20 and the inner sidewall of the outer cylinder 10 combine to form a cyclone space 11. The top of the inner cylinder 20 is lower than the top of the outer cylinder 10. It can be understood that a second accommodating cavity is formed in the inner portion of the inner cylinder 20 and penetrates through opposite ends of the inner cylinder 20. The first accommodating cavity and the second accommodating cavity are in communication. It should be noted that the connecting frame 40 is composed of a plurality of connecting rods. The plurality of connecting rods surround to form a reverse-tapered space. Since the connecting frame 40 composed of the plurality of connecting rods is a frame structure, the communication between the first accommodating cavity and the second accommodating cavity is not affected. The shape of the connecting rod includes two kinds, one is a circular ring structure, and the other is a straight rod structure.

[0034] It should be noted that the sludge concentration device further comprises a flow assisting device. The flow assisting device is used to push the solution to flow into the cyclone space from bottom to top. It can be understood that the distance between the bottom of the outer cylinder 10 and the top of the flow assisting device should be greater than 200 mm. In order to achieve the above requirement, a supporting rod is installed at the bottom of the outer cylinder 10. The outer cylinder 10 is maintained at a corresponding height through the supporting rod to ensure the communication between the outer cylinder 10 and the external environment. It should be further noted that the flow assisting device can be located above the outer cylinder 10 or inside the outer cylinder 10.

[0035] In the embodiment, the flow guide assembly includes a plurality of first flow guide pieces 31 and a plurality of second flow guide pieces 32, the plurality of first flow guide pieces 31 are divided into two groups, the two groups of first flow guide pieces 31 are arranged on the inner side wall of the outer cylinder 10, and one group is located above the other group, each group of first flow guide pieces includes four first flow guide pieces 31, the four first flow guide pieces 31 are uniformly distributed on the inner side wall of the outer cylinder 10 at equal angles along the circumference of the outer cylinder 10, and each first flow guide piece 31 is arranged obliquely along the inner side wall of the outer cylinder 10, so that the four first flow guide pieces 31 combine to form an upward spiral structure, the number of second flow guide pieces 32 is four, the four second flow guide pieces 32 are uniformly distributed on the inner side wall of the inner cylinder 20 at equal angles along the circumference of the inner cylinder 20, and each second flow guide piece 32 is arranged obliquely along the inner side wall of the inner cylinder 20, so that the four second flow guide pieces 32 combine to form a downward spiral structure.

[0036] It should be noted that the first flow guide piece 31 and the second flow guide piece 32 are arranged outside and intersected, the included angle between the first flow guide piece 31 and the horizontal plane and the included angle between the second flow guide piece 32 and the horizontal plane are both 30°-75°, it can be understood that the most suitable included angle between the first flow guide piece 31 and the horizontal plane and the most suitable included angle between the second flow guide piece 32 and the horizontal plane are both 45°, the rotation direction of the solution in the cyclone space 11 and the rotation direction in the inner cylinder 20 are consistent.

[0037] In the embodiment, the flow assisting device can be a flow assisting device or an aeration device.

[0038] In the embodiment, the bottom of the inner cylinder 20 is provided with a baffle 21, when the flow assisting device drives the sludge-water mixture into the cyclone space 11 and flows upward, the baffle 21 can block the sludge-water mixture from entering the second accommodating cavity, the baffle 21 is located in the first accommodating cavity, it should be noted that the baffle 21 encloses a conical space, the side wall of the baffle 21 is inclined outward and upward from the center of the inner cylinder 20. It should be noted that the included angle between the section of the baffle 21 and the horizontal plane is 15°-25°.

[0039] In the embodiment, the bottom of the inner cylinder 20 is provided with a circular truncated cone structure 22, the opening area of the upper end of the circular truncated cone structure 22 is the same as the opening area of the inner cylinder 20, the opening area of the lower end of the circular truncated cone structure 22 is smaller than the opening area of the inner cylinder 20, the end of the circular truncated cone structure 22 away from the inner cylinder 20 is connected with the baffle 21 through a receiving rod, so that there is a gap between the opening of the bottom of the inner cylinder 20 and the baffle, while ensuring that the baffle 21 can block the sludge-water mixture from flowing into the inner cylinder 20 from bottom to top, the bottom of the circular truncated cone structure 22 is not blocked by the baffle 21, the water in the inner cylinder 20 can flow out from the gap between the receiving rod and the baffle 21 from bottom to top, and re-enter the cyclone space 11, forming a circulating flow state, and the sludge is continuously concentrated in the circulating flow state.

[0040] It can be understood that the sludge-water mixture is driven into the cyclone space 11 by the flow aid device and flows upward, and the sludge-water mixture is blocked from entering the second accommodating cavity by the baffle 21. The sludge-water mixture in the cyclone space 11 realizes the formation of a spiral upward flow state in the cyclone space 11 by the flow guiding effect of the first flow guide sheet 31, so that the sludge concentration in the inner ring of the cyclone space 11 is higher than that in the outer ring, and the primary concentration operation of the sludge in the sludge-water mixture is completed. When the sludge-water mixture rises to a certain height, the sludge-water mixture with high sludge concentration in the inner ring of the cyclone space 11 enters the second accommodating cavity and flows downward, and under the action of the second flow guide sheet 32, the sludge-water mixture in the second accommodating cavity forms a spiral downward flow state, and at this time, the sludge concentration in the inner ring of the second accommodating cavity is higher than that in the outer ring, thereby realizing the secondary concentration operation of the sludge in the sludge-water mixture.

[0041] In addition, after the sludge concentration operation, the sludge-water mixture in the outer cylinder 10 and the inner cylinder 20 is different from the external environment, that is, the sludge concentration of the sludge-water mixture in the outer cylinder 10 and the inner cylinder 20 is higher, and the dissolved oxygen concentration is lower. The sludge particles are increased and the inside is more dense, and a larger anoxic environment is formed inside the sludge particles. Under the action of the two, the microbial denitrification is doubly strengthened. After a long time of operation, the sludge flora is more abundant, thereby further enhancing the denitrification effect.

[0042] In the embodiment, the top of the outer cylinder 10 is provided with an adjustable weir plate 12. The adjustable weir plate 12 is used to adjust the water yield of the outer cylinder 10. Specifically, the position of the adjustable weir plate 12 can be adjusted by a hydraulic rod to adjust the overflow water yield, so as to further adjust the sludge concentration in the inner ring of the cyclone space 11. It can be understood that when the sludge-water mixture rises to a certain height, the sludge-water mixture with high sludge concentration in the inner ring of the cyclone space 11 is mixed into the second accommodating cavity, and the sludge-water mixture with low sludge concentration in the outer ring of the cyclone space 11 flows out of the outer cylinder 10 and continues to circulate. The higher the height of the adjustable weir plate 12, the smaller the water yield flowing out of the outer cylinder 10, and the higher the sludge amount held in the cyclone space 11, and the more concentrated the concentrated sludge.

[0043] In the embodiment, the bottom of the outer cylinder 10 is provided with a horn-shaped structure 13. The opening area of the horn-shaped structure 13 away from the outer cylinder 10 is larger than the opening area of the outer cylinder 10, so that more sludge-water mixture can enter the cyclone space 11. It should be noted that the height of the outer cylinder 10 and the height of the horn-shaped structure 13 are in a ratio of 4:15, and the height of the outer cylinder 10 and the maximum diameter of the bottom of the horn-shaped structure 13 are in a ratio of 1:3.

[0044] Further, the included angle of the horn-shaped structure 13 with respect to the vertical plane is 45°-55°.

[0045] In the embodiment, the circular truncated cone structure 22 is provided with a barrier plate 23, and the barrier plate 23 and the inner side wall of the circular truncated cone structure 22 enclose a hopper 24. The hopper 24 is used to contain the sludge accumulated in the inner cylinder 20. It should be noted that the circular truncated cone structure 22 is provided with a first through hole 25, and the outer cylinder 10 is provided with a second through hole. The first through hole 25 is in communication with the hopper 24, and the outer cylinder 10 is in communication with the outside through the second through hole. One end of a sludge discharge pipe 50 is in communication with the hopper 24 in sequence through the second through hole and the first through hole 25. The other end of the sludge discharge pipe 50 is connected to a sludge concentration tank. A sludge pump is connected to the sludge discharge pipe 50. The concentrated sludge in the hopper is discharged along the sludge discharge pipe 50 through the sludge pump. Since the sludge pump is started intermittently, the sludge trapped in the hopper during the interval is further concentrated by gravity. It should be noted that the first through hole 25 and the second through hole are both in sealed connection with the sludge discharge pipe 50.

[0046] It can be understood that the sludge accumulated in the hopper 24 is only part of the sludge in the sludge-water mixture in the inner cylinder 20. The remaining sludge will flow out of the inner cylinder 20 along with the sludge-water mixture and enter the outer cylinder 10. The remaining sludge will continue to circulate along with the newly introduced sludge-water mixture to perform the sludge concentration operation.

[0047] It can be understood that in other embodiments, the device can be completely placed in water; or the highest position of the device can be higher than the water surface. In this case, the distance between the highest position of the device and the water surface should not exceed the height at which the water in the outer cylinder 10 can overflow.

[0048] In one specific embodiment, a sewage treatment plant in an industrial park, wherein the influent is organic industrial wastewater, and the A 2 MBR process is used. The treatment capacity is 20,000 tons per day, and the effluent meets the first level A criteria of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). Four sludge concentration devices are placed in a group of MBR (Membrane Bioreactor) tanks near the membrane tank area, and the devices are used for sludge discharge as the first experimental group. The height difference between the uppermost part of the device and the liquid level in the MBR tank is adjusted to be 100-200 mm by adjusting the height of the adjustable weir plate 12. Another group does not add the device, which is the first control group.

[0049] During the two-month operation, the sludge concentration in the MBR tank was 8000 mg / L to 12000 mg / L for the first experimental group, and after concentration by the device, the sludge concentration was increased to 20000 mg / L to 35000 mg / L. This saved energy for the subsequent sludge concentration process. If the sludge is compressed to a moisture content of 60%, the energy consumption after using the device is 0.04 kW·h / kg to 0.05 kW·h / kg, which can save about 20% of energy. The first control group without using the device has an energy consumption of about 0.05 kW·h / kg to 0.06 kW·h / kg from the sludge discharge in the reaction tank to the completion of compression and delivery to the conveyor. At the same time, it was found that the addition of the device improved the nitrogen removal effect of the system. The specific effect can be referred to the total nitrogen (TN) concentration change in Figure 4 .

[0050] As shown in Figure 4 , during the operation, the average concentration of influent biochemical oxygen demand (COD) of the first experimental group and the first control group was 440.39 mg / L, and the average total nitrogen concentration was 82.5 mg / L. The average total nitrogen concentration of the effluent of the first control group was 11.01 mg / L, and the average total nitrogen concentration of the effluent of the first experimental group was 8.83 mg / L. The average removal rates of the first control group and the first experimental group were 86.7% and 89.3%, respectively. Compared with the first control group, the total nitrogen removal efficiency of the first experimental group increased by 3.0%, indicating that under the conditions of this test, the device can enhance the biological denitrification effect.

[0051] In one specific embodiment, a sewage treatment plant with a treatment capacity of 2x100 tons / day, the device (without setting the hopper 24, sludge discharge pipe 50 and valve) is placed in one of the A 2 O process in the aerobic tank, by adjusting the height of the adjustable weir plate 12, the height difference between the uppermost part of the device and the liquid level in the aerobic tank is 100mm to 200mm, and other operating parameters are consistent, as the second experimental group; the other group does not add the device, as the second control group. After one month of stable operation, the changes in total nitrogen concentration of the effluent of the two groups are compared, as shown in Figure 5 .

[0052] As shown in Figure 5As shown in the figure, during the operation, the average concentration of the biochemical oxygen demand of the influent is 192.84 mg / L, and the average total nitrogen concentration is 39.18 mg / L. The average total nitrogen concentration of the effluent of the second control group is 10.14 mg / L, and the average total nitrogen concentration of the effluent of the second experimental group is 7.38 mg / L. The average removal rates of the second control group and the second experimental group are 74.1% and 81.2%, respectively, and the removal effect is improved by 8.7%. The sludge concentration in the aerobic tank is 3000 mg / L-4000 mg / L, and the sludge concentration in the inner cylinder 20 is 7000 mg / L-10000 mg / L. It shows that the device can significantly enhance the biological denitrification effect.

[0053] In the specific implementation, the sludge-water mixture enters the outer cylinder 10 and flows upward through the flow assisting device, and under the action of the first flow guide piece 31, the sludge-water mixture can form a spiral upward flow state in the cyclone space 11, so that the sludge concentration in the inner ring of the outer cylinder 10 is higher than that in the outer ring, realizing the primary concentration operation of the sludge in the sludge-water mixture. When the sludge-water mixture rises to the height of the connecting frame 40, the sludge-water mixture with high sludge concentration in the inner ring enters the inner cylinder 20 and flows downward, and under the action of the second flow guide piece 32, the sludge-water mixture in the inner cylinder 20 forms a spiral downward flow state, and at this time, the sludge concentration in the inner ring of the inner cylinder 20 is higher than that in the outer ring, thereby realizing the secondary concentration operation of the sludge in the sludge-water mixture. In the sludge concentration operation, not only other power sources are not needed, which is beneficial to save resources, but also the device has a simple structure, is easy to operate, and has strong applicability.

[0054] It should be noted that the above implementation process is only to illustrate the feasibility of the present application, but it does not mean that the sludge concentration device of the present application has only the above-mentioned unique implementation process. On the contrary, as long as the sludge concentration device of the present application can be implemented, it can be included in the feasible implementation scheme of the present application.

[0055] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0056] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A sludge thickening apparatus, characterized by, The mud thickening device comprises an outer cylinder, an inner cylinder and a flow guide assembly. The inner cylinder is located in the outer cylinder and is connected to the outer cylinder through a connecting frame. The flow guide assembly comprises a plurality of first flow guide pieces and a plurality of second flow guide pieces. The first flow guide pieces and the second flow guide pieces are arranged outside and cross each other.

2. The sludge concentration device according to claim 1, characterized by Each of the plurality of first flow guide pieces is divided into two groups.

3. The sludge concentration device according to claim 1, characterized by One group of the first flow guide pieces is located above the other group of the first flow guide pieces.

4. The sludge concentration device according to claim 1, characterized by Each group of the first flow guide pieces is distributed on the inner side wall of the outer cylinder along the circumference of the outer cylinder.

5. The sludge concentration device of claim 1, wherein Each of the first flow guide pieces is arranged obliquely along the inner side wall of the outer cylinder.

6. The sludge concentration device according to claim 5, characterized in that The first flow guide pieces are used for guiding the mud-water mixture in the rotational flow space.

7. The sludge concentration device according to claim 5, characterized by The mud-water mixture forms a spiral upward flow state in the rotational flow space.

8. The sludge concentration device according to claim 7, characterized in that The sludge concentration in the inner circle of the rotational flow space is higher than that in the outer circle.

9. The sludge concentration device of claim 1, wherein The plurality of second flow guide pieces are distributed on the inner side wall of the inner cylinder along the circumference of the inner cylinder. The second flow guide pieces are arranged obliquely along the inner side wall of the inner cylinder. The second flow guide pieces are used for guiding the mud-water mixture from the inner circle of the rotational flow space. The mud-water mixture forms a spiral downward flow state in the inner cylinder. The sludge concentration in the inner circle of the inner cylinder is higher than that in the outer circle. The rotation direction in the rotational flow space is consistent with that in the inner cylinder. The top of the inner cylinder is lower than that of the outer cylinder. The bottom of the inner cylinder is provided with a baffle. A gap is left between the baffle and the opening of the inner cylinder bottom. The baffle is located in the outer cylinder. The mud thickening device further comprises a flow assisting device. The flow assisting device is used for pushing the solution to flow into the rotational flow space from bottom to top. The mud thickening device is completely placed in water. The distance between the bottom of the outer cylinder and the top of the flow assisting device is greater than 200 mm. The flow assisting device is an aeration device. The included angle between the first flow guide pieces and the second flow guide pieces and the horizontal plane is 30°-75°. The top of the outer cylinder is provided with an adjustable weir plate. The adjustable weir plate is used for adjusting the water discharge of the outer cylinder. The bottom of the outer cylinder is provided with a horn-shaped structure. The opening area of the end of the horn-shaped structure away from the outer cylinder is greater than the opening area of the outer cylinder. The bottom of the inner cylinder is provided with a circular truncated cone-shaped structure. The opening area of the upper end of the circular truncated cone-shaped structure is the same as that of the inner cylinder. The opening area of the lower end of the circular truncated cone-shaped structure is smaller than that of the inner cylinder. The end of the circular truncated cone-shaped structure away from the inner cylinder is connected to the baffle through a receiving rod. The circular truncated cone-shaped structure is provided with a blocking plate. The blocking plate and the inner side wall of the circular truncated cone-shaped structure form a mud bucket. The circular truncated cone-shaped structure and the outer cylinder are respectively provided with a first perforation and a second perforation. The first perforation is in communication with the mud bucket. One end of a mud pipe passes through the second perforation and the first perforation in sequence and is in communication with the mud bucket. The inner part of the outer cylinder is hollow to form a first accommodating cavity. The inner cylinder and the connecting frame are located in the first accommodating cavity.

10. The sludge concentration device of claim 1, wherein The baffle plate encloses a conical space, and the tangent plane of the side wall of the baffle plate is arranged to be inclined outward and upward from the center of the inner cylinder.

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