A high-efficiency clarifying device and a sewage treatment system

Abstract

The present disclosure provides a high-efficiency clarifying device and a sewage treatment system. The high-efficiency clarifying device comprises a water inlet device, a high-efficiency clarifying kettle and a gas stripping reflux device. The water inlet device comprises an inverted trapezoidal water inlet; the high-efficiency clarifying kettle comprises a sludge-water separation zone, a sludge concentration zone and a water discharge device, the sludge-water separation zone is located above the sludge concentration zone, the sludge concentration zone is in the shape of a conical hopper, the inverted trapezoidal water inlet is arranged on the outer wall of the sludge concentration zone, and the water discharge device is in communication with the sludge-water separation zone; the gas stripping reflux device comprises a reflux pipeline, a gas stripping pipeline and a control valve, the sludge inlet end of the reflux pipeline is in communication with the bottom of the sludge concentration zone, the gas outlet end of the gas stripping pipeline is in communication with the reflux pipeline, and the control valve is arranged at the gas inlet end of the gas stripping pipeline. By arranging the high-efficiency clarifying device provided by the present disclosure in the aerobic zone, the secondary sedimentation tank is not required, thereby effectively reducing the land occupation of the sewage treatment system, and the high-efficiency clarifying device provided by the present disclosure has low cost and low operation and maintenance cost.

Description

Technical Field

[0001] This disclosure relates to the field of wastewater treatment technology, and in particular to a high-efficiency clarification device and a wastewater treatment system. Background Technology

[0002] In wastewater treatment technology, clarification devices are devices that use gravity sedimentation to separate suspended particles with a density greater than water from the mixed liquor. They are generally used before or after biological treatment and are one of the most widely used technologies in wastewater treatment. The sedimentation tank located after biological treatment is also called a secondary sedimentation tank.

[0003] With the development of the wastewater treatment industry and the policy requirements for improving the quality and efficiency of wastewater treatment plants, some wastewater treatment plants / stations with long operating years, low effluent standards, or poor operating performance often face requirements for expansion and upgrading. When some processes that do not require secondary sedimentation tanks, such as SBR, MBR, and CASS processes, need to be converted to AAO processes, secondary sedimentation tanks are often required. However, the sludge in the secondary sedimentation tank has a high organic content and a high water content, and the density of the sludge is close to that of water. Therefore, the sludge settling time is long and the space required is large. In addition, the technology of setting up a secondary sedimentation tank is complex, the construction investment is high, and the operation and maintenance costs are high, which makes the conversion quite difficult. Summary of the Invention

[0004] In view of this, the present disclosure provides a high-efficiency clarification device and a wastewater treatment system, which at least partially solves the problems existing in the prior art.

[0005] The first aspect of this disclosure provides a high-efficiency clarification device, located in an aerobic zone. The device includes an inlet water device, a high-efficiency clarification vessel, and an air-lift reflux device. The inlet water device includes an inverted trapezoidal inlet. The high-efficiency clarification vessel includes a sludge-water separation zone, a sludge thickening zone, and a drainage device. The sludge-water separation zone is located above and communicates with the sludge thickening zone. The sludge thickening zone is cone-shaped, wider at the top and narrower at the bottom. The inverted trapezoidal inlet is located on the outer wall of the sludge thickening zone. The drainage device communicates with the sludge-water separation zone. The air-lift reflux device includes a reflux pipe, an air-lift pipe, and a control valve. The sludge inlet end of the reflux pipe communicates with the bottom of the sludge thickening zone. The air outlet end of the air-lift pipe communicates with the lower middle part of the reflux pipe. The air inlet end of the air-lift pipe communicates with a blower. The control valve is located at the air inlet end of the air-lift pipe.

[0006] According to a specific implementation of the first aspect of this disclosure, the high-efficiency clarification apparatus further includes a control system for controlling the automated operation of the water inlet device, the high-efficiency clarification vessel, and the air stripping reflux device.

[0007] According to a specific implementation of the first aspect of this disclosure, the control system includes a control box, a reflux sensor, a sludge level gauge, and a sludge concentration meter. The reflux sensor is installed on the reflux pipe, the sludge level gauge is installed inside the sludge-water separation zone, and the sludge concentration meter is installed in the aerobic zone and / or the anoxic zone and / or the anaerobic zone. The control box is used to receive signals from the reflux sensor, the sludge level gauge, and the sludge concentration meter and to control the operation of the water inlet device, the high-efficiency clarifier, and the air-lift reflux device.

[0008] According to a specific implementation of the first aspect of this disclosure, the drainage device includes a water collection device, a water collection bracket, and a water collection pipe. The water collection device is disposed above the mud-water separation zone, the water collection bracket is used to fix the water collection device, and the water inlet pipe is connected to the water collection device.

[0009] According to a specific implementation of the first aspect of this disclosure, the water inlet device further includes two triangular baffles and an inverted trapezoidal baffle. The inverted trapezoidal baffle is arranged opposite to the inverted trapezoidal water inlet. The two triangular baffles are respectively arranged on both sides of the inverted trapezoidal baffle, and the inverted trapezoidal baffle and the outer wall of the sludge thickening zone enclose the water inlet area with the opening facing upward. The water inlet area is connected to the inverted trapezoidal water inlet.

[0010] According to a specific implementation of the first aspect of this disclosure, the top of the inverted trapezoidal baffle is higher than the top of the trapezoidal inlet, and the height difference between the top of the inverted trapezoidal baffle and the top of the trapezoidal inlet is 300mm.

[0011] According to a specific implementation of the first aspect of this disclosure, the distance between the inverted trapezoidal baffle and the inverted trapezoidal inlet along the direction of the vertical inverted trapezoidal baffle is 100mm.

[0012] According to a specific implementation of the first aspect of this disclosure, the control valve includes a first valve and a second valve. The first valve is used to control the amount of airflow, and the second valve is used to control the opening and closing of the airlift pipe.

[0013] A second aspect of this disclosure provides a wastewater treatment system, comprising an anaerobic zone, an anoxic zone, an aerobic zone, a sludge tank, and at least one of the high-efficiency clarification devices described in any of the first aspects of this disclosure, wherein the high-efficiency clarification device is located in the aerobic zone.

[0014] According to a specific implementation of the second aspect of this disclosure, the sludge outlet end of the return pipe is connected to at least one of the aerobic zone, the anoxic zone, the anaerobic zone, and the sludge zone.

[0015] The high-efficiency clarification device provided in this embodiment is located in the aerobic zone. The high-efficiency clarification device includes an inlet device, a high-efficiency clarification vessel, and an air-lift reflux device. The inlet device includes an inverted trapezoidal inlet. The high-efficiency clarification vessel includes a sludge-water separation zone, a sludge thickening zone, and a drainage device. The sludge-water separation zone is located above and communicates with the sludge thickening zone. The sludge thickening zone is cone-shaped, wider at the top and narrower at the bottom. The inverted trapezoidal inlet is located on the outer wall of the sludge thickening zone. The drainage device communicates with the sludge-water separation zone. The air-lift reflux device includes a reflux pipe, an air-lift pipe, and a control valve. The sludge inlet end of the reflux pipe communicates with the bottom of the sludge thickening zone. The air outlet end of the air-lift pipe communicates with the reflux pipe. The air inlet end of the air-lift pipe communicates with a blower. The control valve is located at the air inlet end of the air-lift pipe. By placing the high-efficiency clarification device provided in this disclosure in the aerobic zone, without the need for an additional secondary sedimentation tank, the footprint of the wastewater treatment system is effectively reduced. Furthermore, the airlift reflux device can return the settled sludge to the anaerobic zone and / or the anoxic zone and / or the aerobic zone, thereby effectively retaining activated sludge, increasing the sludge concentration in the aerobic zone, and thus improving treatment efficiency. In addition, the high-efficiency clarification device provided in this disclosure has no mechanical or electrical equipment, resulting in low cost and low operation and maintenance expenses. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A three-dimensional structural schematic diagram of a high-efficiency clarification device provided in the first aspect embodiment of this disclosure; Figure 2 A top view of a high-efficiency clarification apparatus provided in the first aspect of this disclosure; Figure 3 A side view of an efficient clarification apparatus provided in the first aspect of this disclosure; Figure 4 A front view of an efficient clarification apparatus provided in the first aspect of this disclosure; Figure 5 A top view of a wastewater treatment system provided for a second aspect embodiment of this disclosure.

[0018] The accompanying drawings may not be drawn to scale.

[0019] Explanation of reference numerals in the attached figures: 10. High-efficiency clarification device: 1. Inlet device; 1-1. Inverted trapezoidal inlet; 1-2. Triangular baffle; 1-3. Inverted trapezoidal baffle; 2. High-efficiency clarification kettle; 2-1. Sludge-water separation zone; 2-2. Sludge thickening zone; 2-3. Water collection device; 2-4. Water collection support; 2-5. Water collection pipe; 3. Air lift reflux device; 3-1. Reflux pipe; 3-2. Air lift pipe; 3-3. First valve; 3-4. Second valve; 4. Control system; 4-1. Control box; 4-2. Reflux sensor; 4-3. Sludge level gauge; 4-4. Sludge concentration meter; 100. Wastewater treatment system. Detailed Implementation

[0020] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0021] The following specific examples illustrate the implementation of this disclosure. Those skilled in the art can easily understand other advantages and effects of this disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. This disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0022] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this disclosure, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0023] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this disclosure. The drawings only show the components related to this disclosure and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0024] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0025] With the development of the wastewater treatment industry and policy requirements for improving the quality and efficiency of wastewater treatment plants, some wastewater treatment plants / stations with long operating years, low effluent standards, or poor operating performance often face requirements for expansion and upgrading. When processes that do not require secondary sedimentation tanks, such as SBR, MBR, and CASS processes, need to be converted to AAO processes, secondary sedimentation tanks are often required. Traditionally used sedimentation tanks, such as horizontal flow sedimentation tanks, radial flow sedimentation tanks, vertical flow sedimentation tanks, and MBR, have the following disadvantages: 1. Horizontal Flow Sedimentation Tank: Large footprint: Relies on gravity settling, resulting in a long residence time, long tank body, large footprint, and high infrastructure costs; Susceptible to hydraulic conditions: Uneven influent distribution can easily cause short circuits, reducing sedimentation efficiency; Sludge management issues: Sludge removal efficiency heavily relies on the sludge scraper; untimely sludge removal can easily generate biogas, causing the sludge to turn black and float, affecting the effluent quality; Complex equipment and high maintenance requirements: The installation and operation of the sludge scraper are relatively complex, with a high failure rate; High energy consumption: Numerous electrical devices such as return pumps, sludge pumps, and sludge scrapers are required.

[0026] 2. Radial flow sedimentation tank: 1) High infrastructure cost: The circular structure of the radial flow sedimentation tank is complex, making construction difficult and costly, and requiring high construction quality. 2) Large footprint: Radial flow sedimentation tanks occupy a larger area than other sedimentation tanks and are generally suitable for large and medium-sized sewage treatment plants. 3) High requirements for water distribution: Uneven water distribution can easily lead to short circuits or local turbulence, affecting the sedimentation effect. 4) High energy consumption: There are many electrical equipment such as return pumps, sludge pumps, and sludge scrapers, resulting in higher energy consumption than horizontal flow sedimentation tanks. 5) High maintenance requirements: The bearings, drive devices, turntables, and other components of the sludge scraper require regular maintenance.

[0027] 3. Vertical flow sedimentation tank: High infrastructure cost: The tank is deep, making construction difficult and costly; High requirements for sludge management: The bottom sludge hopper is prone to clogging, requiring frequent sludge removal; Limited processing capacity: The applicable water volume for a single tank is relatively small, and the excessively large tank diameter can easily lead to uneven water distribution and reduced sedimentation efficiency.

[0028] 4. MBR membrane bioreactor: Compared with traditional biological water treatment sedimentation tanks, MBR has advantages such as good and stable effluent quality, small footprint, easy automation, and less residual sludge. However, its disadvantages are also very obvious: high membrane cost; membrane is easy to foul, and operation and management are complicated; high energy consumption, and the supporting power equipment is much higher than that of traditional processes; more mechanical equipment, and complex maintenance and management.

[0029] In summary, the sedimentation tanks mentioned above suffer from various problems, including complex technology, high construction investment, and high operation and maintenance costs. Meanwhile, the renovation of wastewater treatment plants often faces challenges such as limited land area and insufficient space, and requires renovation technologies that are small in footprint, have low operating costs, low investment costs, and are easy to maintain and manage.

[0030] To address the aforementioned problems, this disclosure provides a high-efficiency clarification device 10 and a wastewater treatment system 100. The high-efficiency clarification device 10 and wastewater treatment system 100 of this disclosure will be described below with reference to the accompanying drawings.

[0031] Please refer to the reference. Figures 1 to 4 This disclosure provides a high-efficiency clarification device, which is set in an aerobic zone. The high-efficiency clarification device includes an inlet device 1, a high-efficiency clarification vessel 2, and an air-lift reflux device 3. The water inlet device 1 includes an inverted trapezoidal inlet 1-1; the high-efficiency clarifier 2 includes a sludge-water separation zone 2-1, a sludge thickening zone 2-2, and a drainage device. The sludge-water separation zone 2-1 is located above and connected to the sludge thickening zone 2-2. The sludge thickening zone 2-2 is a cone-shaped structure with a larger upper part and a smaller lower part. The inverted trapezoidal inlet 1-1 is located on the outer wall of the sludge thickening zone 2-2, and the drainage device is connected to the sludge-water separation zone 2-1; the air-lift reflux device 3 includes a reflux pipe 3-1, an air-lift pipe 3-2, and a control valve. The sludge inlet end of the reflux pipe 3-1 is connected to the bottom of the sludge thickening zone 2-2 for discharging the settled activated sludge. The air outlet end of the air-lift pipe 3-2 is connected to the middle and lower part of the reflux pipe 3-1 for supplying air to the reflux pipe 3-1, so that the sludge is returned to the corresponding position under the action of air lifting. The air inlet of the air lifting pipe 3-2 is connected to the blower, and the control valve is located at the air inlet of the air lifting pipe 3-2.

[0032] The sludge-water separation zone 2-1 is the main area for sludge-water separation and also the area where the suspended sludge layer is formed. The sludge thickening zone 2-2 thickens the separated sludge by gravity. The cone-shaped sludge thickening zone 2-2 can more effectively rely on the gravity settling of sludge without the need for equipment such as scrapers or suction machines, thereby reducing operating costs and equipment maintenance costs. Optionally, the angle between the outer wall of the sludge thickening zone 2-2 and the horizontal plane is 60±2°. The drainage device includes a water collection device 2-3, a water collection support 2-4, and a water collection pipe 2-5. The water collection device 2-3 is located above the sludge-water separation zone 2-1, the water collection support 2-4 is used to fix the water collection device 2-3, and the inlet pipe is connected to the water collection device 2-3.

[0033] The high-efficiency clarifier 2 adopts a modular design with a surface area of ​​no more than 25m2. For large-scale sewage treatment plants, multiple high-efficiency clarifier 2 units can be arranged in parallel to control the height of the high-efficiency clarifier 2 units and ensure the water distribution effect. At the same time, the aerobic zone can be transformed from a completely mixed form to a plug flow form, thereby improving the sewage treatment efficiency.

[0034] By placing the high-efficiency clarification device provided in this disclosure in the aerobic zone, without the need for an additional secondary sedimentation tank, the footprint of the wastewater treatment system 100 is effectively reduced. Furthermore, the airlift reflux device 3 can return the settled sludge to the anaerobic zone and / or the anoxic zone and / or the aerobic zone, thereby effectively retaining activated sludge, increasing the sludge concentration in the aerobic zone, and thus improving treatment efficiency. In addition, the high-efficiency clarification device provided in this disclosure has no mechanical or electrical equipment, resulting in low cost and low operation and maintenance expenses.

[0035] In some optional embodiments, the high-efficiency clarification device further includes a control system 4 for automatically controlling the operation of the inlet device 1, the high-efficiency clarification vessel 2, and the air-lift reflux device 3. Optionally, the control system 4 includes a control box 4-1, a reflux sensor 4-2, a sludge level gauge 4-3, and a sludge concentration meter 4-4. The reflux sensor 4-2 is installed on the reflux pipe 3-1 and can detect the sludge reflux status in real time. When the reflux status of the reflux pipe 3-1 does not match the set status, a fault occurs, and the control box 4-1 will issue a fault signal to indicate the fault information. The sludge level gauge 4-3 is installed inside the sludge-water separation zone 2-1 to monitor the thickness of the suspended sludge layer. If the suspended sludge layer is too thick, "sludge run-out" is likely to occur, that is, the activated sludge flows out with the water flow, affecting the effluent water quality; if the suspended sludge layer is too thin, the filtration and interception effect on the inlet water is weakened, which will lead to an increase in effluent SS. When control box 4-1 receives a high sludge level signal from sludge level gauge 4-3, it outputs an open signal for airlift reflux device 3, initiating reflux through reflux pipe 3-1, causing the sludge level to drop. Conversely, when sludge level gauge 4-3 outputs a low sludge level signal, control box 4-1 closes the airlift reflux device 3, stopping the sludge reflux pipe. This method controls the thickness of the suspended sludge layer, thereby ensuring effective sedimentation. Sludge concentration meter 4-4 is installed in the aerobic and / or anoxic and / or anaerobic zones. When the sludge concentration is low, control box 4-1 controls the sludge reflux to the aerobic / anoxic or anaerobic tank to increase the sludge concentration and improve treatment efficiency. When the sludge concentration is high, control box 4-1 controls the sludge reflux to the sludge tank for discharging excess sludge, preventing a decrease in removal rate caused by sludge aging in the aerobic / anoxic or anaerobic tank.

[0036] In some optional embodiments, the water inlet device 1 further includes two triangular baffles 1-2 and an inverted trapezoidal baffle 1-3. The inverted trapezoidal baffle 1-3 is arranged opposite to the inverted trapezoidal inlet 1-1. The two triangular baffles 1-2 are respectively arranged on both sides of the inverted trapezoidal baffle 1-3, and together with the outer wall of the inverted trapezoidal baffle 1-3 and the sludge thickening zone 2-2, they form an upward-opening water inlet zone, which is connected to the inverted trapezoidal inlet 1-1. Optionally, the top of the inverted trapezoidal baffle 1-3 is higher than the top of the trapezoidal inlet, and the height difference between the top of the inverted trapezoidal baffle 1-3 and the top of the trapezoidal inlet is 300mm. This can effectively prevent air bubbles in the aerobic zone from entering the high-efficiency clarification device with the water flow and affecting the sedimentation performance.

[0037] Optionally, along the direction of the vertical inverted trapezoidal baffle 1-3, the distance between the inverted trapezoidal baffle 1-3 and the inverted trapezoidal inlet 1-1 is 100mm, thereby ensuring that the inlet flow velocity is controlled within a certain range. This allows the sludge in the sludge thickening zone 2-2 to form a suspended sludge layer under the impact of the inlet flow velocity. The suspended sludge layer can filter and retain the mixed liquor containing activated sludge entering the high-efficiency clarification device, enhancing the sedimentation efficiency, resulting in lower SS content in the effluent, and significantly reducing the surface load and residence time of the sedimentation tank.

[0038] In some optional embodiments, the control valves include a first valve 3-3 and a second valve 3-4. The first valve 3-3 controls the air volume, thereby controlling the return flow rate; the second valve 3-4 controls the opening and closing of the airlift pipe 3-2, thereby controlling the return flow time. Optionally, the first valve 3-3 is a manual valve, and the second valve 3-4 is a solenoid valve, an electric valve, or a pneumatic valve. The solenoid valves can also be in the form of a solenoid valve group, controlling the airflow through the airlift pipe 3-2 by controlling the number of valves opened within the group, thereby controlling the return flow rate.

[0039] A second aspect of this disclosure provides a wastewater treatment system 100, comprising an anaerobic zone, an anoxic zone, an aerobic zone, a sludge tank, and at least one of the high-efficiency clarification devices described in any of the first aspects of this disclosure, wherein the high-efficiency clarification device is located in the aerobic zone.

[0040] Please refer to the reference. Figures 1 to 5 The wastewater treatment system 100 provided in the second aspect of this disclosure includes the high-efficiency clarification device provided in the first aspect of the disclosure, and has all the beneficial effects of the high-efficiency clarification device in the first aspect of the disclosure. To avoid repetition, it will not be described again here.

[0041] In some alternative embodiments, the sludge outlet of the return pipe 3-1 is connected to at least one of the aerobic zone, anoxic zone, anaerobic zone, and sludge zone. Specifically, the sludge outlet of the return pipe 3-1 can be set in the aerobic zone, anoxic zone, anaerobic zone, or sludge zone according to functional requirements. When returned to the aerobic zone, it can be used to increase the sludge concentration in the aerobic zone and screen for highly active sludge; when returned to the anoxic zone, it can be used to replenish the sludge in the anoxic zone and promote denitrification; when returned to the anaerobic zone, it can be used for anaerobic phosphorus release and enhance phosphorus removal; when the system needs to discharge excess sludge, it can be returned to the sludge zone.

[0042] In summary, the high-efficiency clarification device and wastewater treatment system 100 provided in this disclosure have the following advantages: (1) The high-efficiency clarification device adopts a modular design and can be installed independently or in combination in the existing aerobic biological tank without adding land.

[0043] (2) The high-efficiency clarification device is set in the aerobic zone. The aerobic zone pool type can be changed from a completely mixed type to a plug flow type by the arrangement, thereby improving the treatment efficiency.

[0044] (3) The high-efficiency clarification device can effectively retain activated sludge through intelligent control of reflux, increase the sludge concentration in the aerobic zone, and thus improve the treatment efficiency.

[0045] (4) The high-efficiency clarification device has no mechanical or electrical equipment, and has low cost and low operation and maintenance costs.

[0046] (5) The high-efficiency clarification device can form a suspended sludge layer and control the thickness parameters of the sludge layer through intelligent control, thereby improving the sludge-water separation effect, with high surface load and small footprint.

[0047] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A high efficiency clarifier device, provided in an aerobic zone, characterized in that, include: Water inlet device, including an inverted trapezoidal water inlet; The high-efficiency clarification vessel includes a mud-water separation zone, a sludge thickening zone, and a drainage device. The mud-water separation zone is located above and connected to the sludge thickening zone. The sludge thickening zone is a cone-shaped vessel with a larger upper part and a smaller lower part. The inverted trapezoidal water inlet is located on the outer wall of the sludge thickening zone. The drainage device is connected to the mud-water separation zone. The air-lift reflux device includes a reflux pipe, an air-lift pipe, and a control valve. The sludge inlet end of the reflux pipe is connected to the bottom of the sludge thickening zone, the air outlet end of the air-lift pipe is connected to the middle and lower part of the reflux pipe, the air inlet end of the air-lift pipe is connected to a blower, and the control valve is located at the air inlet end of the air-lift pipe.

2. The high-efficiency clarification device according to claim 1, characterized in that, The high-efficiency clarification device also includes a control system for automatically controlling the operation of the water inlet device, the high-efficiency clarification vessel, and the air stripping reflux device.

3. The high-efficiency clarification device according to claim 2, characterized in that, The control system includes a control box, a reflux sensor, a sludge level gauge, and a sludge concentration meter. The reflux sensor is installed on the reflux pipe, the sludge level gauge is installed inside the sludge-water separation zone, and the sludge concentration meter is installed in the aerobic zone and / or the anoxic zone and / or the anaerobic zone. The control box is used to receive signals from the reflux sensor, the sludge level gauge, and the sludge concentration meter and to control the operation of the water inlet device, the high-efficiency clarifier, and the air-lift reflux device.

4. The high-efficiency clarification device according to claim 1, characterized in that, The drainage device includes a water collection device, a water collection bracket, and a water collection pipe. The water collection device is located above the mud-water separation zone. The water collection bracket is used to fix the water collection device. The water inlet pipe is connected to the water collection device.

5. The high-efficiency clarification apparatus according to claim 1, characterized in that, The water inlet device also includes two triangular baffles and one inverted trapezoidal baffle. The inverted trapezoidal baffle is arranged opposite to the inverted trapezoidal water inlet. The two triangular baffles are respectively arranged on both sides of the inverted trapezoidal baffle, and the inverted trapezoidal baffle and the outer wall of the sludge concentration zone enclose the water inlet area with the opening facing upward. The water inlet area is connected to the inverted trapezoidal water inlet.

6. The high-efficiency clarification apparatus according to claim 5, characterized in that, The top of the inverted trapezoidal baffle is higher than the top of the trapezoidal inlet, and the height difference between the top of the inverted trapezoidal baffle and the top of the trapezoidal inlet is 300mm.

7. The high-efficiency clarification apparatus according to claim 5, characterized in that, Along the direction perpendicular to the inverted trapezoidal baffle, the distance between the inverted trapezoidal baffle and the inverted trapezoidal water inlet is 100mm.

8. The high-efficiency clarification apparatus according to claim 1, characterized in that, The control valve includes a first valve and a second valve. The first valve is used to control the air volume, and the second valve is used to control the opening and closing of the air lifting pipe.

9. A wastewater treatment system, characterized in that, It includes an anaerobic zone, an anoxic zone, an aerobic zone, a sludge tank, and at least one high-efficiency clarification device as described in any one of claims 1 to 8, wherein the high-efficiency clarification device is located in the aerobic zone.

10. The wastewater treatment system according to claim 9, characterized in that, The sludge outlet of the return pipe is connected to at least one of the aerobic zone, the anoxic zone, the anaerobic zone, and the sludge zone.

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