Sedimentation tank with novel suction dredge system

Abstract

The invention discloses a sedimentation tank with a novel suction dredge system, and relates to the technical field of sewage treatment. A sedimentation tank with a novel suction dredger system comprises a sedimentation tank system, a suction dredger system, a ventilation and deodorization system, a sludge pipeline system and an electric control system, the sedimentation tank system comprises a cover plate which is arranged at the top of the sedimentation tank and can seal the sedimentation tank; the suction dredge system, the ventilation and deodorization system and the electric control system are all arranged in the sedimentation tank system; the ventilation and deodorization system comprises a ventilation and deodorization pipeline and an air supply port; the suction dredger system comprises a track platform used for installation and operation of a suction dredger. And the sludge pipeline system comprises a sludge return system and a sludge discharge system. The product provided by the invention can be applied to a closed pool, and is provided with a ventilation and deodorization system, thereby being beneficial to environmental protection.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to a sedimentation tank with a novel sludge suction machine system. Background Art

[0002] Wastewater treatment is a crucial component of municipal engineering. Existing sludge suction machines, due to their structural limitations, can only be used in open sedimentation tanks or grit chambers. Even with partial covers, they cannot be completely sealed due to the influence of the sludge suction pipes. With increasing environmental protection requirements, more and more sewage treatment plants are adopting fully enclosed roof deodorization systems, making the use of traditional sludge suction machines increasingly rare.

[0003] The sedimentation tank after biological treatment is called the secondary or final sedimentation tank. The secondary sedimentation tank's function is to separate mud and water, clarify the mixed liquor, concentrate the sludge, and return the separated sludge to the biological treatment stage. Its effectiveness directly affects the effluent quality and the concentration of the returned sludge.

[0004] To ensure effluent meets standards, existing sedimentation tanks often occupy large areas, resulting in high project investments. To ensure sufficient return sludge volume, existing secondary sedimentation tanks often utilize high sludge return ratios, leading to higher operating costs. Wastewater treatment systems also require energy-saving and cost-reducing technical measures. For example, by modifying existing secondary sedimentation tank processes to improve sludge settling performance and enhance the treatment efficiency and operational stability of biochemical tanks, the concentration of return sludge can be increased, the amount of sludge returned can be reduced, and energy conservation and cost reduction can be achieved. Summary of the Invention

[0005] In order to overcome the problems existing in the above background technology of "limited application scenarios of traditional sludge suction machines, large area occupied by secondary sedimentation tanks, high project investment and high operating costs", the present invention provides a sedimentation tank with a new type of sludge suction machine system.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a sedimentation tank with a new type of sludge suction machine system, including a sedimentation tank system, a sludge suction machine system, a ventilation and deodorization system, a sludge piping system and an electronic control system; the sedimentation tank system includes a cover plate arranged on the top of the sedimentation tank and capable of sealing the sedimentation tank; the sludge suction machine system, the ventilation and deodorization system and the electronic control system are all arranged inside the sedimentation tank system; the ventilation and deodorization system includes ventilation and deodorization pipelines and an air supply port; the sludge suction machine system includes a track platform for installing and operating the sludge suction machine; the sludge piping system includes a sludge return system and a sludge discharge system.

[0007] Preferably, the cover plate is provided with an inspection hole for facilitating the operation and maintenance of the equipment and the pool body.

[0008] Preferably, the sedimentation tank system further includes an inlet channel, an inlet orifice, an inlet gate, an outlet channel, and a sedimentation tank.

[0009] Preferably, the sludge suction machine system includes a sludge suction machine, a sludge discharge channel, and a water outlet weir.

[0010] Preferably, a plurality of stoplog sluice slots are provided in the mud drainage channel.

[0011] Preferably, the number of the stoplog gate slots is 3-7.

[0012] Preferably, the outlet height of the mud discharge pipe of the mud suction machine is higher than the stoplog gate in the stoplog gate slot.

[0013] Preferably, the sludge return system includes a sludge external return system, and the sludge external return system includes a first sludge return system and a second sludge return system; the first sludge return system is connected to the return sludge hopper; the second sludge return system is connected to the mixed sludge hopper; the sludge discharge system is connected to the mixed sludge hopper.

[0014] Preferably, the sludge return system includes a return sludge flow meter, a return sludge concentration meter, a return sludge valve, and a return sludge pipeline; the sludge discharge system includes a discharge sludge flow meter, a discharge sludge concentration meter, a discharge sludge valve, and a discharge sludge pipeline.

[0015] Preferably, an equipment room is formed inside the sedimentation tank system by setting a partition wall, and the electric control system is arranged inside the equipment room; the electric control system includes a motor.

[0016] Preferably, the air supply port of the ventilation and deodorization system is arranged above the equipment room; the outlet of the ventilation and deodorization pipeline of the ventilation and deodorization system is arranged in the middle of the sedimentation tank.

[0017] In summary, the sedimentation tank of the present invention is a rectangular horizontal flow sedimentation tank, and the (movable bridge) sludge suction machine discharges the settled sludge to the sludge area on the long side of the tank. A plurality of partitions are set in the sludge channel, and the sludge is divided into return sludge and discharge sludge according to the settling order of the sludge in the horizontal flow sedimentation tank, and collected and discharged separately, thereby realizing the function of screening high-quality settled sludge, improving the properties, sedimentation rate, and sludge flora of the sludge in the biochemical tank, improving the treatment effect and operation stability of the biochemical tank, reducing sludge swelling, and solving the problem of sludge floating caused by sludge swelling. At the same time, the concentration of return sludge is increased, the amount of sludge reflux is reduced, and energy is saved and consumption is reduced. Specifically, the technical solution of the present invention has the following technical effects:

[0018] 1. The traditional sludge suction machine can only be used in open pools. After the modification of the present invention, it can be used in closed pools. At the same time, it is equipped with a ventilation and deodorization system, which is beneficial to environmental protection.

[0019] 2. The traditional sludge suction machine has a passage corridor on the top, which needs to consider the load of personnel maintenance and has railings. The present invention is set in the pool, and the sludge suction machine only needs to consider the load of the equipment itself, which can reduce equipment costs.

[0020] 3. According to the principle of sedimentation, the closer the sludge is to the water inlet, the better its settling performance. Therefore, the stoplog sluice installed in the sludge channel can collect and discharge the sludge in sections. The sludge with poor settling performance near the end of the sedimentation tank is selectively discharged as residual sludge. The sludge with good settling performance enters the return sludge hopper at the beginning of the sedimentation tank and flows back to the biochemical treatment system.

[0021] 4. Applicable to sand suction machines with the same principle.

[0022] 5. When used in advanced treatment processes, such as AOA and multi-stage AO deep denitrification processes, achieving high standards of total nitrogen removal requires consideration of the total amount of nitrate nitrogen in the external return flow. This is related to the return flow rate, not the sludge concentration. Sludge with poor settling performance can be returned to the anoxic section after the biological tank through a secondary sludge return system for further total nitrogen removal. This section does not compete with high-quality sludge for nutrients, primarily utilizing the microbial internal carbon source for denitrification, enhancing the denitrification effect of the process. The flow rate can also be adjusted or shut down at any time based on water quality.

[0023] 6. The sludge dual return system fully utilizes the sludge screening system and achieves precise control of the two functions of the traditional external return system by setting up two independent external return systems. Through different sludge return points, the cultivation of dominant sludge bacteria is further strengthened, and the treatment effect is precisely controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present application is further described below with reference to the accompanying drawings:

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0027] Figure 3 This is a schematic diagram of a simple structure in which the mud drainage channel is arranged on the side in the present invention;

[0028] Figure 4 This is a schematic diagram of a multi-stage AO biological pool sludge double recirculation system;

[0029] Figure 5 This is a schematic diagram of the double return system of sludge in the AOA biological pool;

[0030] Description of reference numerals:

[0031] In the figure, 10-sludge discharge channel; 101-stoplog gate; 102-stoplog gate slot; 103-return sludge valve; 104-return sludge flowmeter; 105-return sludge concentration meter; 106-discharge sludge concentration meter; 107-discharge sludge flowmeter; 108-discharge sludge valve; 109-return sludge valve; 11-Sedimentation tank No. 1; 115-partition wall; 12-Sedimentation tank No. 2; 122-equipment room; 123-manhole; 124-air supply port; 13-water inlet channel; 131-water inlet gate; 14-water inlet pipe; 15-water outlet pipe; 161-water outlet weir; 17-track platform; 18-sludge suction machine; 181-sludge suction machine sludge discharge pipe; 19-cover plate; 191-ventilation and deodorization pipe outlet. DETAILED DESCRIPTION

[0032] The present invention provides a sedimentation tank with a novel sludge suction system, comprising a sedimentation tank system, a sludge suction system, a ventilation and deodorization system, a sludge piping system, and an electronic control system. The sedimentation tank system includes a cover plate installed on the top of the sedimentation tank to seal the sedimentation tank. The sludge suction system, ventilation and deodorization system, and electronic control system are all located within the sedimentation tank system. The ventilation and deodorization system includes ventilation and deodorization pipelines and an air supply port. The sludge suction system includes a track platform for mounting and operating the sludge suction system. The sludge piping system includes a sludge return system and a sludge discharge system. The cover plate is provided with an inspection hole for convenient operation and maintenance of the equipment and the tank. The sedimentation tank system also includes an inlet channel, an inlet orifice, an inlet gate, an outlet channel, and a sedimentation tank. The sludge suction system includes a sludge suction system, a sludge discharge channel, and an outlet weir. The sludge discharge channel is provided with a plurality of stoplog gate slots, ranging from 3 to 7. The outlet of the sludge suction discharge pipe is higher than the stoplog gates within the stoplog gate slots. The sludge return system includes an internal sludge return system and an external sludge return system. The internal sludge return system is located within the reaction zone. The external sludge return system includes a first sludge return system and a second sludge return system. The first sludge return system is connected to the return sludge hopper. The second sludge return system is connected to the mixed sludge hopper. The sludge discharge system is connected to the mixed sludge hopper. The sludge return system includes a return sludge flowmeter, a return sludge concentration meter, a return sludge valve, and a return sludge pipeline. The sludge discharge system includes a discharge sludge flowmeter, a discharge sludge concentration meter, a discharge sludge valve, and a discharge sludge pipeline. A partition wall forms an equipment room within the sedimentation tank system. The electronic control system is located within the equipment room and includes equipment such as a motor. The air supply port of the ventilation and deodorization system is located above the equipment room. The outlet of the ventilation and deodorization pipeline of the ventilation and deodorization system is located in the middle of the sedimentation tank.

[0033] The sludge return from the secondary sedimentation tank, also known as sludge external return, has the core function of maintaining the activated sludge concentration in the sewage treatment system and also enhances the pollutant treatment efficiency. With this invention, the settled sludge is collected separately based on its settling performance, thus achieving dual sludge return capability, which can be selected based on the specific process.

[0034] Sludge with good settling properties is completely returned to the biological pool inlet, where it is thoroughly mixed with the inlet water. The abundant nutrients at the inlet are then used to cultivate dominant bacterial strains. This sludge has a high concentration, and a small amount of sludge can be used to control the sludge concentration in the biological pool. This saves energy while forming a virtuous cycle of selecting high-quality sludge, returning sludge at a low flow rate, cultivating high-quality sludge, and enhancing treatment efficiency.

[0035] The following is in conjunction with the appendix of this application Figure 1-5 , the specific embodiments of the present invention are further described in detail.

[0036] Example 1

[0037] Based on the above-mentioned structural features of this application, the implementation method of this application is further described: This embodiment provides a sedimentation tank with a novel sludge suction system, including a sedimentation tank system, a sludge suction system, a ventilation and deodorization system, a sludge piping system, and an electronic control system. The sedimentation tank system includes a cover plate 19 disposed on the top of the sedimentation tank to seal the sedimentation tank. The sludge suction system, ventilation and deodorization system, and electronic control system are all disposed within the sedimentation tank system. The ventilation and deodorization system includes ventilation and deodorization pipelines and an air supply port 124. The sludge suction system includes a track platform 17 for installing and operating the sludge suction machine 18. The sludge piping system includes a sludge return system and a sludge discharge system. The cover plate 19 is provided with an inspection hole 123 for convenient operation and maintenance of the equipment and the tank body. The sedimentation tank system also includes an inlet channel 13, an inlet orifice, an inlet gate 131, an outlet channel, and a sedimentation tank. The sludge suction system includes a sludge suction machine 18, a sludge discharge channel 10, and an outlet weir 161. Four stoplog sluice slots 102 are provided in the mud discharge channel 10. The mud suction pipe 181 of the mud suction machine 18 is at an outlet height that avoids the stoplog sluice 101 of the mud discharge channel. The internal sludge reflow system is arranged inside the reaction zone; the external sludge reflow system includes a first sludge reflow system and a second sludge reflow system; the first sludge reflow system is connected to the return sludge hopper; the second sludge reflow system is connected to the mixed sludge hopper; the discharge sludge system is connected to the mixed sludge hopper; the first sludge reflow system includes a first return sludge flowmeter 104, a first return sludge concentration meter 105, a first return sludge valve 103, and a first return sludge pipeline; the second sludge reflow system includes a second return sludge flowmeter, a second return sludge concentration meter, a second return sludge valve 109, and a second return sludge pipeline; the discharge sludge system includes a discharge sludge flowmeter 107, a discharge sludge concentration meter 106, a discharge sludge valve 108, and a discharge sludge pipeline. The interior of the sedimentation tank system is formed by setting up a partition wall 115 to form an equipment room 122, and the electronic control system is arranged inside the equipment room 122. The air supply port 124 of the ventilation and deodorization system is located above the equipment room 122. The ventilation and deodorization pipeline outlet 191 of the ventilation and deodorization system is located in the middle of the sedimentation tank. The water inlet pipe 14 and the water outlet pipe 15 are respectively located at both ends of the sedimentation tank.

[0038] The present invention can have one or two sedimentation tanks, and there is no limit on the number of sedimentation tanks. In this embodiment, there are two sedimentation tanks, namely, No. 1 sedimentation tank 11 and No. 2 sedimentation tank 12.

[0039] Example 2

[0040] In this embodiment, a stoplog gate 101 is first installed at the third stoplog gate slot 102, and both the return sludge valve 103 and the discharge sludge valve 108 are opened. At this point, 3 / 5 of the sludge near the inlet enters the sludge return system, while 2 / 5 of the sludge near the outlet enters the sludge system.

[0041] According to the sedimentation principle, the closer the sludge is to the water inlet, the better its sedimentation performance. Therefore, the sludge with better sedimentation performance and higher sludge concentration will be returned to the biochemical treatment system through the sludge hopper and the return system, while the sludge with poor sedimentation performance will be discharged through the sludge discharge trough and the sludge discharge system.

[0042] The sludge return system includes a return sludge concentration meter 105 (measured value recorded as C1), a return sludge flow meter 104 (measured value recorded as q1), and supporting pipes and valves. The return sludge is taken from the sludge on the side close to the water inlet. The sludge discharge system includes a discharge sludge concentration meter 106 (measured value recorded as C2), a discharge sludge flow meter 107 (measured value recorded as q2), and supporting pipes and valves. The discharge sludge is taken from the sludge on the side close to the water outlet. The amount of return sludge required for system operation is set to ΔQ, that is, ΔQ = q1 × C1. When ΔQ is a fixed value, the larger C1 is, the smaller q1 is, the smaller the system return volume is, and the smaller the return pump and energy consumption are; conversely, the smaller C1 is, the higher the energy consumption is.

[0043] After a period of operation, the sludge properties of the entire biochemical system can be greatly improved, the sludge settling properties can be improved, and at the same time the return sludge concentration C1 gradually increases, and the return sludge pump can operate at a lower operating condition, that is, q1 is small; at this time, the concentration of C2 also increases, which can reduce the discharged sludge discharge q2 and reduce the system operation energy consumption.

[0044] Subsequently, the placement of the stoplog gate will be further adjusted according to actual project needs, such as setting it at the second stoplog gate slot to further improve sludge settling properties and reduce the energy consumption of the entire system.

[0045] Example 3

[0046] This embodiment provides a sedimentation tank with a novel sludge suction machine system, including a sedimentation tank system, a sludge suction machine system, a ventilation and deodorization system, a sludge piping system, and an electronic control system. The sedimentation tank system includes a cover plate 19 disposed on the top of the sedimentation tank to seal the sedimentation tank. The sludge suction machine system, ventilation and deodorization system, and electronic control system are all disposed within the sedimentation tank system. The ventilation and deodorization system includes ventilation and deodorization pipelines and an air supply port 124. In this embodiment, two air supply ports can be provided, with one air supply port provided at the top of each equipment room. The sludge suction machine system includes a track platform 17 for installing and operating the sludge suction machine 18. The sludge piping system includes a sludge return system and a sludge discharge system. The cover plate 19 is provided with an inspection hole 123 for convenient operation and maintenance of the equipment and the tank body. In this embodiment, three inspection holes can be provided. An inspection hole can also be provided in the middle of the sedimentation tank to facilitate access for maintenance personnel to the equipment.

[0047] The sedimentation tank system also includes an inlet channel 13, an inlet orifice, an inlet gate 131, an outlet channel, and a sedimentation tank. The sludge suction system includes a sludge suction machine 18, a sludge discharge channel 10, and an outlet weir 161. Five stoplog gate slots 102 are located within the sludge discharge channel 10. During operation, the stoplog gate can be initially placed in the second stoplog gate slot and then adjusted based on project needs.

[0048] The outlet height of the sludge suction pipe 181 of the sludge suction machine 18 is clear of the stoplog gate 101 of the sludge discharge channel. The sludge return system includes a return sludge flowmeter 104, a return sludge concentration meter 105, a return sludge valve 103, and a return sludge pipeline. The sludge discharge system includes a discharge sludge flowmeter 107, a discharge sludge concentration meter 106, a discharge sludge valve 108, and a discharge sludge pipeline. A partition wall 115 is provided within the sedimentation tank system to form an equipment room 122, and the electronic control system is located within this equipment room 122.

[0049] The air supply port 124 of the ventilation and deodorization system is arranged above the equipment room 122; in this embodiment, four air supply ports are provided, and the ventilation and deodorization pipeline outlet 191 of the ventilation and deodorization system is arranged in the middle of the sedimentation tank; air enters from both sides and exits from the middle, which is conducive to forming air convection and improving the deodorization effect; the water inlet pipe 14 and the water outlet pipe 15 are respectively arranged at both ends of the sedimentation tank.

[0050] Example 4

[0051] In the above embodiments, the mud drain channels are all set in the middle of the sedimentation tank. Figure 3 As shown, in this embodiment, the mud discharge channel 10 can also be set on the side of the sedimentation tank.

[0052] Example 5

[0053] The sludge with good sedimentation performance enters the return sludge hopper, where all the sludge is returned to the front end of the biological pool through the first sludge return system. The return ratio is calculated based on the return sludge flow meter 104 and the return sludge concentration meter 105.

[0054] Sludge with poor settling performance enters the mixed sludge hopper. Part of the sludge here is returned to the front section of the anoxic zone of the system through the second sludge return system. The flow rate ratio of the second sludge return system is calculated based on the second return sludge flow meter, second return sludge concentration meter, nitric nitrogen meter, etc. Part of the sludge is discharged from the system through the sludge discharge system.

[0055] like Figure 5As shown, another embodiment is that when the reaction zone is set as multiple anoxic zones and aerobic zones, the internal recirculation system is provided inside the reaction zone to achieve internal recirculation of sludge and improve the reaction efficiency of sludge. Sludge with poor sedimentation performance enters the mixed sludge hopper, where part of the sludge is returned to the front section of the rear anoxic zone of the system through the second sludge recirculation system. The flow ratio of the second sludge recirculation system is calculated based on the second recirculation sludge flow meter, the second recirculation sludge concentration meter, the nitrate nitrogen meter, etc. This part of the sludge usually contains a higher concentration of nitrate nitrogen (NO3 - -N). It is directly returned to the post-anoxic zone, and the endogenous carbon source of microorganisms can be used for endogenous denitrification, which can efficiently remove the nitrate nitrogen carried by the return sludge itself, significantly enhance the total nitrogen (TN) removal capacity of the system, and especially meet the high-standard denitrification needs. The carbon source in the post-anoxic zone is usually scarce. This return point selection avoids the competition between the sludge with poor sedimentation and the high-activity high-quality sludge returned from the front end for the easily degradable organic carbon source in the influent, and focuses on denitrification using internal carbon sources. According to the influent water quality and the target effluent TN requirements (monitored by nitrate nitrogen meters, etc.), the flow ratio of the second return sludge system can be flexibly adjusted or completely closed to achieve refined management of process operation.

[0056] The present invention provides two completely independent sludge external return systems (pumps, pipes, flow meters, concentration meters, etc.), one for each of the two separated and collected sludge flows. The first sludge return system calculates and controls the return ratio based on the sludge concentration and the target MLSS of the biological pool via the first return sludge flow meter and the first return sludge concentration meter. The second sludge return system calculates and controls the flow ratio based on the denitrification demand, the nitrate-nitrogen concentration of the return sludge (which can be estimated or monitored online), and the overall sludge balance, in combination with data from the second return sludge flow meter, the second return sludge flow meter, and the nitrate-nitrogen meter.

[0057] The external reflux system of the present invention is configured as a double reflux system, which can be used in various processes and sedimentation tanks with sludge screening, can achieve the function of efficient graded screening, improve reaction efficiency and sludge utilization, and has a wide range of application scenarios.

[0058] Compared with the traditional sedimentation tank, this embodiment is equipped with a cover plate, and all the sludge suction machines are placed inside the sedimentation tank. The sludge suction machines only consider the load of the equipment itself, eliminate the top railings and other facilities, and are set inside the sedimentation tank, under the cover plate, which can greatly reduce the equipment cost.

[0059] In the description of the present invention, it should be noted that the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0060] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed or detachable connections, or integral connections; mechanical or electrical connections; direct connections or connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0061] To sum up, for those skilled in the art, according to the guidance of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, replacements and deformations made to the present invention still fall within the scope of protection of the present invention.

Claims

1. A sedimentation tank with a new type of sludge suction system, characterized by: It includes a sedimentation tank system, a sludge suction machine system, a ventilation and deodorization system, a sludge piping system and an electronic control system; the sedimentation tank system includes a cover plate arranged on the top of the sedimentation tank and capable of sealing the sedimentation tank; the sludge suction machine system, the ventilation and deodorization system and the electronic control system are all arranged inside the sedimentation tank system; the ventilation and deodorization system includes ventilation and deodorization pipelines and an air supply port; the sludge suction machine system includes a track platform for the installation and operation of the sludge suction machine; the sludge piping system includes a sludge return system and a sludge discharge system.

2. The sedimentation tank according to claim 1, characterized in that The cover plate is provided with an inspection hole for easy operation and maintenance.

3. The sedimentation tank according to claim 1, characterized in that The sedimentation tank system further comprises a water inlet channel, a water inlet orifice, a water inlet gate, a water outlet channel and a sedimentation tank.

4. The sedimentation tank according to claim 1, characterized in that The sludge suction machine system includes a sludge suction machine, a sludge discharge channel, a water outlet weir, and a sludge hopper; the sludge hopper includes a return sludge hopper and a mixed sludge hopper.

5. The sedimentation tank according to claim 4, characterized in that A plurality of stoplog sluice slots are arranged in the mud discharge channel.

6. The sedimentation tank according to claim 5, characterized in that The outlet height of the mud discharge pipe of the mud suction machine is higher than the stoplog gate in the stoplog gate groove.

7. The sedimentation tank according to any one of claims 4 to 6, characterized in that: The sludge return system includes an external sludge return system, and the external sludge return system includes a first sludge return system and a second sludge return system; The first sludge return system is connected to the return sludge hopper; The second sludge return system is communicated with the mixed sludge hopper; and the sludge discharge system is communicated with the mixed sludge hopper.

8. The sedimentation tank according to claim 7, characterized in that The sludge return system includes a return sludge flow meter, a return sludge concentration meter, a return sludge valve, and a return sludge pipeline; The sludge discharge system includes a sludge discharge flow meter, a sludge discharge concentration meter, a sludge discharge valve, and a sludge discharge pipeline.

9. The sedimentation tank according to claim 1, characterized in that An equipment room is formed inside the sedimentation tank system by arranging a partition wall, and the electric control system is arranged inside the equipment room.

10. The sedimentation tank according to claim 1, characterized in that: The air supply port of the ventilation and deodorization system is arranged above the equipment room; the outlet of the ventilation and deodorization pipeline of the ventilation and deodorization system is arranged in the middle of the sedimentation tank.

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