Aeration sludge drainage sewage treatment well and high-load artificial wetland thereof

Abstract

The present invention discloses an aerated sludge-discharging sewage treatment well and a high-load artificial wetland thereof, belonging to the field of sewage treatment technology. The treatment well includes a vertical shaft, an aeration pipe and a sludge discharge pipe. The wall of the vertical shaft is covered with water holes. The sludge discharge pipe includes a sludge discharge pipe section with a built-in opening and closing valve and a sludge inlet pipe section provided with sludge inlet aeration holes. The sludge inlet pipe section is horizontally arranged at the bottom of the vertical shaft. One end of the sludge inlet pipe section is closed and the other end is connected to the sludge discharge pipe section. The other end of the sludge discharge pipe section extends from the top of the vertical shaft. One end of the aeration pipe is connected to an aeration device and the other end is connected to the sludge discharge pipe section. The connection position is close to and located above the sludge inlet pipe section. The aeration pipe has dual functions of aeration and sludge discharge. When the sludge discharge function is turned on, excess inorganic pollutants can be treated. An aerobic environment is generated by the aeration function. The artificial wetland includes a treatment pool. An aerated sludge-discharging sewage treatment well is provided in the treatment pool. The vertical shafts are arranged in a matrix in the treatment pool. The outside of the vertical shafts is filled with a wetland matrix. The wetland matrix layer height is less than the height of the vertical shaft.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to an aerated sludge-discharging sewage treatment well and a high-load artificial wetland thereof. Background Art

[0002] Constructed wetlands are one of the primary technologies used for small-scale domestic sewage treatment in rural towns. The most common process is the anaerobic (anaerobic + aerobic) + constructed wetland combination. The main process steps and system configuration are as follows: sewage - regulating tank - anaerobic tank (for hydrolysis and acidification) - anoxic tank (for denitrification) - aerobic tank (for aerobic degradation and nitrification) - sedimentation tank - constructed wetland - effluent. In actual application, it has been found that constructed wetlands are deep treatment systems, and their effective operation is highly dependent on the stability of pretreatment at the front end (primarily the AO stage). Therefore, after pretreatment, the water quality entering the constructed wetland must meet SS ≤ 80mg / l (SS refers to organic and inorganic particulate matter). Otherwise, excessive pollutant concentrations (SS exceeding the standard) can easily lead to overload of the constructed wetland, resulting in substandard effluent. However, rural domestic sewage is prone to excessive levels of pollutants due to various reasons, such as: 1. Rural domestic sewage treatment systems mainly adopt unattended management methods, which cannot adjust operating status and eliminate faults in a timely manner; 2. Due to the limitations of rural water use habits and water conditions, the concentration of pollutants in rural domestic sewage is often very high; 3. The overall structure and function of rural domestic sewage treatment systems are relatively simple, and their ability to resist the impact of pollutants is relatively poor; 4. During the rainy season, rainwater will bring a large amount of mud, sand and other debris into the treatment system, which can easily cause wetland blockage.

[0003] Current artificial wetlands generally lack sand and mud drainage equipment, making it difficult to cope with excessive amounts of inorganic pollutants such as sediment and debris. Without effective wetland mud drainage and dredging facilities, artificial wetlands can become clogged, causing short-flow or even interrupted flow and blockage. Furthermore, the internal environment of current artificial wetlands is either purely anaerobic or purely aerobic due to the presence of aeration equipment. This results in microbial communities being dominated by either anaerobic or aerobic bacteria. This results in a single, slow degradation method for organic pollutants and poor degradation capacity, making it impossible to quickly degrade organic matter and meet treatment standards in a short period of time. High concentrations of organic pollutants and excessive amounts of inorganic pollutants have a long-term impact on wetlands. Therefore, effectively increasing the treatment capacity of artificial wetlands and preventing the accumulation of sediment and other debris are crucial to the continued efficient operation of the entire sewage treatment system. Summary of the Invention

[0004] The purpose of the present invention is to solve the above-mentioned technical problems and provide an aerated sludge discharge sewage treatment well and a high-load artificial wetland thereof. The aerated sludge discharge sewage treatment well has the dual functions of aeration and sludge discharge. It is installed in a sewage treatment pool or an artificial wetland. Turning on the sludge discharge function can treat inorganic pollutants that enter the wetland in excess. The aeration function generates an aerobic environment, which can provide aerobic treatment and ensure the continuous and efficient operation of the artificial wetland of the small sewage treatment system.

[0005] To achieve the above-mentioned objectives, the present invention provides the following solution: The present invention discloses an aerated sludge discharge sewage treatment well, comprising a vertical shaft, an aeration pipe and a sludge discharge pipe, the well wall of the vertical shaft being circumferentially covered with water holes communicating with the outside world, the sludge discharge pipe comprising a sludge discharge pipe section with its own opening and closing valve and a sludge inlet pipe section provided with sludge inlet aeration holes, the sludge inlet pipe section being horizontally arranged at the bottom of the vertical shaft, one end of the sludge inlet pipe section being closed, the other end of the sludge inlet pipe section being communicated with one end of the sludge discharge pipe section, the other end of the sludge discharge pipe section extending from the top of the vertical shaft to the outside world, one end of the aeration pipe being connected with an aeration device, the other end of the aeration pipe being communicated with the sludge discharge pipe section, the connection position between the aeration pipe and the sludge discharge pipe section being close to and located above the sludge inlet pipe section.

[0006] Preferably, an isolation tray with a sludge drop hole is provided above the mud inlet pipe section, and the isolation tray supports a bubble cutting layer for cutting bubbles discharged from the mud inlet aeration holes.

[0007] Preferably, the cutting and foaming layer comprises a plastic basket and stainless steel shavings filled in the plastic basket.

[0008] Preferably, the filling thickness of the stainless steel shavings is 200-400 mm.

[0009] Preferably, the diameter of the aeration pipe is smaller than the diameter of the mud discharge pipe.

[0010] Preferably, the vertical shaft is a HDPE double-wall corrugated pipe.

[0011] Preferably, the distance between the mud inlet pipe section and the bottom of the shaft is 80-120 mm, and the distance between the aeration pipe and the mud discharge pipe section and the bottom of the shaft is 300-500 mm.

[0012] Also disclosed is a high-load artificial wetland, comprising a treatment pool, wherein an aeration sludge and sewage treatment well is arranged in the treatment pool, the vertical wells are arranged in a matrix in the treatment pool, and the outside of the vertical wells is filled with a wetland matrix, and the layer height of the wetland matrix is ​​less than the height of the vertical wells.

[0013] Preferably, the center distance between two adjacent vertical shafts is 1500-4000 mm, and the diameter of the vertical shaft is 315 mm.

[0014] Preferably, the wetland matrix is ​​volcanic rock particles.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] 1. The aeration and sludge discharge sewage treatment well disclosed in the present invention has an integrated design of aeration pipes and sludge discharge pipes. By opening and switching the on-off valve, it can realize the dual functions of aeration and sludge discharge. It is installed in a sewage treatment pool or artificial wetland. Turning on the sludge discharge function can treat excessive inorganic pollutants entering the wetland. The aeration function creates an aerobic environment and can provide aerobic treatment, ensuring the continuous and efficient operation of the artificial wetland of the small sewage treatment system. It can be effectively applied to the field of small and medium-sized domestic sewage treatment at the village and town level.

[0017] 2. The high-load artificial wetland disclosed in the present invention is equipped with aeration and sludge drainage sewage treatment wells arranged in a matrix. The sludge drainage function can be activated as needed to treat excess inorganic pollutants, avoid the accumulation of silt and inorganic matter, and thus avoid blockage in the artificial wetland, which may cause short-flow or even interruption and blockage. The aeration and sludge drainage sewage treatment wells arranged in a matrix can form multiple alternating aerobic, anoxic and anaerobic environments in the artificial wetland, forming an alternating aerobic, anoxic and anaerobic treatment process in the wetland. Compared with a single pure oxygen wetland or anaerobic wetland, the alternating treatment method can significantly improve the pollutant removal capacity of the wetland. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a top view of a high-load artificial wetland;

[0020] Figure 2 This is a top view of the aeration sludge and sewage treatment well;

[0021] Figure 3 This is a top view of the sewage treatment system;

[0022] Figure 4 A schematic diagram of the sewage treatment route for the sewage treatment system;

[0023] Figure 5 for Figure 1 Cross-sectional view of the high-load constructed wetland at mid-AA;

[0024] Figure 6It is a partial enlarged view of the cross-section of the high-load artificial wetland;

[0025] Figure 7 This is a schematic diagram of the shaft structure.

[0026] Explanation of the accompanying symbols: 1. Equalization tank; 2. Hydrolysis acidification tank; 3. Contact oxidation tank; 4. Sedimentation tank; 5. Sludge collection tank; 6. High-load artificial wetland; 7. Water distribution tank; 8. Perforated flower wall; 9. Water inlet pipe; 10. Water pipe; 11. Water outlet pipe; 12. Return circulation pump; 13. Fan; 14. Vertical shaft; 15. Aeration pipe; 16. Mud discharge pipe; 17. Water hole; 18. Mud inlet aeration hole; 19. Isolation tray; 20. Stainless steel shavings; 21. Wetland matrix; 22. On-off valve; 23. Aeration valve; 24. Column; 25. Return pipe. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example 1

[0029] This embodiment provides an aeration and sludge removal sewage treatment well, which can be used in various sewage treatment pools or artificial wetlands, and has both aeration and sludge removal functions. Figures 1 to 7As shown, it includes a vertical shaft 14, an aeration pipe 15 and a mud discharge pipe 16. The wall of the vertical shaft 14 is circumferentially covered with water holes 17 that communicate with the outside world. Sewage in the sewage treatment tank or artificial wetland can enter the vertical shaft 14 through the water holes 17. The mud discharge pipe 16 includes a mud discharge pipe section and a mud inlet pipe section. The mud discharge pipe section is provided with an on-off valve 22 for controlling the on-off of the mud discharge pipe 16. One end of the mud inlet pipe section is closed, and the other end is connected to one end of the mud discharge pipe section. Mud inlet aeration holes 18 are provided on the wall of the mud inlet pipe section. The mud inlet pipe section is horizontally arranged at the bottom of the vertical shaft 14. The mud discharge pipe section extends upward along the vertical shaft 14 and extends out of the vertical shaft 14 from the top of the vertical shaft 14. Preferably, it can pass through the wall of the vertical shaft 14 to exit the vertical shaft 14. One end of the aeration pipe 15 is connected to an aeration device, and the other end of the aeration pipe 15 is connected to the mud discharge pipe section. The connection position between the aeration pipe 15 and the mud discharge pipe section is close to and located above the mud inlet pipe section. The aeration device mainly transports gas to the aeration pipe 15 to transport oxygen into the sewage, forming an oxygen-rich environment, providing a living environment for aerobic bacteria, and achieving aerobic treatment. Therefore, the aeration equipment can adopt various gas transporting equipment, such as various types of blowers, preferably Roots blowers. As a preferred embodiment, the aeration pipe 15 is connected to the mud discharge pipe section of the mud discharge pipe 16 through an elbow, and the elbow is a 90-degree elbow. The portion of the aeration pipe 15 located in the vertical shaft 14 is vertically arranged, and the portion of the mud discharge pipe section located in the vertical shaft 14 is also vertically arranged.

[0030] Working principle:

[0031] ①Aeration process

[0032] At this time, the aeration equipment is in the open state, the on-off valve 22 of the sludge discharge pipe 16 is in the closed state, and the gas is transported from the aeration pipe 15 to the sludge discharge pipe 16. Since the on-off valve 22 is closed, the gas cannot be discharged from the sludge outlet end of the sludge discharge pipe section of the sludge discharge pipe 16, and can only be discharged through the sludge inlet aeration hole 18 on the sludge inlet pipe section at the bottom of the vertical shaft 14, generating a large number of bubbles that merge into the sewage, increasing the dissolved oxygen in the water body. Through the aeration effect and the flow of water in the artificial wetland, an aerobic environment is formed in the wetland matrix 21 around the vertical shaft 14, providing oxygen for the growth of aerobic microbial flora including digestive bacteria. A large number of aerobic microbial biofilms can grow around the vertical shaft 14, forming an efficient aerobic degradation process, and effectively improving the wetland's ability to treat organic pollutants.

[0033] ② Mud discharge process

[0034] At this time, the aeration equipment is in the open state, and the on-off valve 22 of the mud discharge pipe 16 is in the open state. Gas is transported from the aeration pipe 15 to the mud discharge pipe 16. Since the pressure in the upper part of the mud discharge pipe section of the mud discharge pipe 16 is lower than the pressure in the lower part of the mud discharge pipe section near the mud inlet pipe section when the on-off valve 22 is in the open state, the gas will rise rapidly along the mud discharge pipe section after entering the mud discharge pipe section of the mud discharge pipe 16, and the gas flow rate will accelerate, forming a pressure gradient with a decreasing pressure from top to bottom in the mud discharge pipe section, thereby forming a suction force in the mud inlet pipe section. Inorganic debris that enters the bottom of the vertical shaft 14 with the water flow and settles will enter the mud inlet pipe section through the mud inlet aeration hole 18, and then be discharged along the mud discharge pipe section and enter the sludge collection area, realizing the air lift mud discharge method. Regularly opening and closing the on-off valve 22 can continuously remove debris (mainly inorganic debris) in the wetland, ensuring the unobstructed gaps in the wetland matrix 21. The opening and closing valve 22 can be a manual UPVC ball valve or an automatically controlled electromagnetic valve.

[0035] In this embodiment, Figures 1 to 7 As shown, an isolation tray 19 is installed above the mud inlet pipe section. The isolation tray 19 supports a cutting and breaking bubble layer. The surface of the isolation tray 19 is covered with sludge drop holes. The sludge drop holes serve as a channel for the sludge to sink on the one hand, and isolate the cutting and breaking bubble layer on the upper part of the shaft on the other hand. At the same time, it can ensure that the bubbles discharged from the mud inlet aeration hole 18 can effectively rise, and the rising bubbles can be cut into small bubbles by the cutting and breaking bubble layer, greatly increasing the contact surface area between the bubbles and the water body, effectively increasing the amount of gas integrated into the water body, and improving the dissolved oxygen concentration of the water body. Preferably, the isolation tray 19 is made of a material with high strength and corrosion resistance, such as 304 stainless steel, high-strength glass, and high-strength and corrosion-resistant plastic. The radius of the isolation tray 19 is about 2 mm different from the radius of the shaft 14. Four columns 24 of the same material can be fixed to the lower part of the isolation tray 19 for setting up the isolation tray 19. If the isolation tray 19 is made of 304 stainless steel, its bottom is fixedly connected to four stainless steel square tubes or round tubes by welding. The sludge drop holes on the isolation tray 19 are circular holes with a diameter of 0.8 to 1.5 mm, preferably 10 mm, and a center-to-center distance of 20 to 30 mm, preferably 20 mm.

[0036] In this embodiment, Figures 1 to 7 As shown, the cutting and breaking bubble layer includes a plastic basket and stainless steel shavings 20 filled in the plastic basket. The stainless steel shavings 20 remain naturally loose and agglomerated without being compacted, and are cut into small bubbles by rising bubbles, thereby increasing the amount of gas incorporated into the water and improving the dissolved oxygen concentration in the water.

[0037] In this embodiment, Figures 1 to 7 As shown, the filling thickness of the stainless steel shavings 20 is 200-400 mm, preferably 250 mm.

[0038] In this embodiment, Figures 1 to 7 As shown, the diameter of aeration pipe 15 is smaller than that of mud discharge pipe 16. Preferably, mud discharge pipe 16 is made of DE50 UPVC pipe, while aeration pipe 15 is made of DE25 UPVC pipe. Mud inlet aeration holes 18, which serve the dual functions of aeration and mud discharge, are provided on both sides of the mud inlet section of mud discharge pipe 16 in the horizontal direction. These holes extend along the length of the mud inlet section, have a diameter of 10 mm, are spaced 50 mm apart from each other, and are located on opposite sides of the pipe.

[0039] In this embodiment, Figures 1 to 7 As shown, the shaft 14 is a HDPE double-wall corrugated pipe.

[0040] In this embodiment, Figures 1 to 7 As shown, the mud inlet pipe section is 80-120 mm, preferably 100 mm, from the bottom of the shaft 14. The connection point between the aeration pipe 15 and the mud discharge pipe section is 300-500 mm, preferably 400 mm, from the bottom of the shaft 14. This ensures sufficient negative pressure is generated in the mud inlet pipe section to transport the sewage out of the mud discharge pipe 16. Specifically, the aeration pipe 15 and mud discharge pipe 16 are installed along one side of the shaft 14 wall and connected by an elbow. The total height of the corresponding columns 24 and isolation tray 19 is 200-300 mm.

[0041] In this embodiment, Figures 1 to 7 As shown, in order to facilitate the control of the aeration pipe 15 , an aeration valve 23 may be installed on the aeration pipe 15 .

[0042] Example 2

[0043] This embodiment provides a high-load artificial wetland, such as Figures 1 to 7 As shown, it includes a treatment pool, in which the aeration sludge drainage sewage treatment wells described in Example 1 are arranged. The vertical shafts 14 are arranged in a matrix in the treatment pool. The outside of the vertical shafts 14 is filled with a wetland matrix 21. The layer height of the wetland matrix 21 is less than the height of the vertical shafts 14. Figure 1 The figure shows a high-load constructed wetland 6 equipped with six vertical shafts 14, evenly distributed according to the shape and size of the treatment tank. Wastewater within the wetland can flow through the water holes in the shafts. At the same time, inorganic impurities within the wetland matrix 21 can flow into the shafts with the water flow, where they settle and become suspended.

[0044] Regularly carry out mud discharge by the mud discharge pipe 16 and aeration pipe 15 in the vertical shaft 14, can effectively avoid inorganic matter such as silt accumulation, can continue to remove the foreign matter in wetland (mainly inorganic foreign matter), ensure the unimpeded flow of wetland matrix 21 gaps.Then by the flowing of water body in aeration and treatment tank, in the wetland matrix 21 around the vertical shaft 14, form aerobic environment, for aerobic bacteria provide environment, based on aerobic degradation, and leave the place of vertical shaft 14, the dissolved oxygen concentration in the wetland matrix 21 reduces gradually, then forms anoxic and anaerobic environment successively, based on anaerobic degradation and denitrification process.Due to being distributed with multiple vertical shafts 14 in the treatment tank, so in whole high-load artificial wetland 6, form the state that aerobic, anoxic, anaerobic are carried out alternately, when sewage flows in treatment tank, the pollutant in sewage can obtain different process and repeatedly process, then quickly treat sewage, can high-load process organic pollutants, and treatment effluent water quality can obviously improve.

[0045] In order to ensure that there is enough area for the alternating aerobic, anoxic and anaerobic conditions, in this embodiment, Figures 1 to 7 As shown, the center distance between two adjacent vertical shafts 14 is 1500-4000 mm, preferably 1500 mm. The diameter of the vertical shaft 14 is 315 mm, and the diameter of the water hole 17 is 20-30 mm.

[0046] In this embodiment, Figures 1 to 7 As shown, the wetland substrate 21 is volcanic rock particles, preferably with a particle size of 50 to 80 mm. Of course, other particles can also be used, such as stones, bricks, volcanic rocks, ceramsite, porous granular calcium carbonate filter material, ceramsite, and other materials. However, volcanic rock particles are still preferred.

[0047] In this embodiment, Figures 1 to 7 As shown, both ends of the treatment pool are equipped with water distribution tanks 7. On the top of the wetland matrix 21, an aeration pipe 15 and a mud discharge pipe 16 are horizontally installed. A manual UPVC ball valve or an automatically controlled solenoid valve is installed as an opening and closing valve 22 on the aeration pipe 15 and the mud discharge pipe 16 at a convenient operation position in the water distribution tank 7.

[0048] In this embodiment, Figures 1 to 7 As shown, aquatic plants such as foxtail algae and pennywort are planted on the wetland matrix 21. Through repeated anaerobic, aerobic, and anoxic treatment processes, organic pollutants in the wastewater are fully degraded and removed. The released nitrogen and phosphorus can be absorbed and utilized by the aquatic plants on the wetland matrix 21. In winter, insulation and heating covers can be added to the treatment pool as needed.

[0049] Example 3

[0050] This embodiment provides a sewage treatment system, such as Figures 1 to 7As shown, the system comprises a regulating tank 1, two hydrolysis and acidification tanks 2, a contact oxidation tank 3, a sedimentation tank 4, a sludge collection tank 5, and two high-load constructed wetlands 6. The treatment tanks of the high-load constructed wetlands 6 are equipped with water distribution tanks 7 at both ends, with a perforated decorative wall 8 between the water distribution tank 7 and the treatment tanks. Sewage is fed into the regulating tank 1 via a pump station and an inlet pipe 9, where it regulates water quality and quantity. A perforated decorative wall 8 is installed between the regulating tank 1 and the first hydrolysis and acidification tank 2. Sewage entering the regulating tank 1 passes through holes in the perforated decorative wall 8 into the first hydrolysis and acidification tank 2. A perforated decorative wall 8 is also installed between the two hydrolysis and acidification tanks 2. Sewage that has passed through the first hydrolysis and acidification tank passes through the perforated decorative wall 8 into the second hydrolysis and acidification tank 2. The hydrolysis and acidification tanks 2 are rich in anaerobic microbial biofilms, which capture and degrade organic matter in the sewage. The microorganisms in the anaerobic bacterial bed degrade large organic molecules into soluble small molecules, providing the necessary conditions for subsequent processes. The wastewater then enters the contact oxidation tank 3 through a pipeline for aerobic reaction. The completed wastewater then passes through the L pipe and enters the sedimentation tank, where it is then precipitated. Undegraded debris in the sedimentation tank 4 is either settled or suspended, isolated, and then enters the distribution tank 7 at the end of the first high-load constructed wetland 6 through the downward-turned L connecting pipe. It then passes through the perforated decorative wall 8 and enters the treatment tank of the first high-load constructed wetland 6. After treatment, it enters the distribution tank 7 of the second high-load constructed wetland 6 through the other end of the distribution tank 7 and the water pipe 10, and then enters the treatment tank of the second high-load constructed wetland 6. Finally, it is discharged through the distribution tank 7 and the outlet pipe 11 of the second high-load constructed wetland 6. If the wastewater does not meet the treatment standards, it can be returned to the second hydrolysis and acidification tank 2 for further treatment via the return circulation pump 12 and return pipe 25, achieving a recycling process to ensure effective treatment. The aeration pipe 15 also provides aeration for the contact oxidation tank 3 through branch pipes. All sludge discharged from the sludge pipe 16 is sent to the sludge collection tank 5. The sewage treatment system is equipped with a finished 100mm insulation board plus internal and external composite board equipment room. The equipment room is equipped with a set of intelligent electric control system and two fans 13 (one for use and one for backup). The fan 13 can be a Roots blower.

[0051] Overall, the hydraulic retention time (HRT) for regulating tank 1 is 8 hours; for hydrolysis and acidification tank 2, 12 hours; for contact oxidation tank 3, 6 hours; for sedimentation tank 4, 4 hours; for high-conformity constructed wetland 6, 2 units have a HRT of 36 hours; and for sludge collection tank 5, 2 hours. Based on the requirements of the process flow, design parameters, and process, the water flow pattern and water flow patterns for the various tanks were rationally designed to ensure the effective and stable operation of the entire system. The invention and application of this device represents a technological advancement in wastewater treatment, and has achieved excellent results through experimental verification and three years of practical application.

[0052] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An aeration sludge drainage sewage treatment well, characterized in that: It includes a vertical shaft, an aeration pipe and a mud discharge pipe. The wall of the vertical shaft is circumferentially covered with water holes communicating with the outside world. The mud discharge pipe includes a mud discharge pipe section with its own on-off valve and a mud inlet pipe section provided with mud inlet aeration holes. The mud inlet pipe section is horizontally arranged at the bottom of the vertical shaft, one end of the mud inlet pipe section is closed, and the other end of the mud inlet pipe section is connected to one end of the mud discharge pipe section. The other end of the mud discharge pipe section extends from the top of the vertical shaft to the outside world. One end of the aeration pipe is connected to an aeration device, and the other end of the aeration pipe is connected to the mud discharge pipe section. The connection position between the aeration pipe and the mud discharge pipe section is close to and located above the mud inlet pipe section, and the connection position between the aeration pipe and the mud discharge pipe section is located below the on-off valve.

2. The aeration sludge drainage sewage treatment well according to claim 1, characterized in that: An isolation tray with a sludge drop hole is mounted above the mud inlet pipe section, and a bubble cutting layer for cutting bubbles discharged from the mud inlet aeration hole is supported on the isolation tray.

3. The aeration sludge drainage sewage treatment well according to claim 2, characterized in that: The cutting and foaming layer comprises a plastic basket and stainless steel shavings filled in the plastic basket.

4. The aeration sludge drainage sewage treatment well according to claim 3, characterized in that: The filling thickness of the stainless steel shavings is 200-400 mm.

5. The aeration sludge drainage sewage treatment well according to claim 1, characterized in that: The diameter of the aeration pipe is smaller than the diameter of the mud discharge pipe.

6. The aeration sludge drainage sewage treatment well according to claim 5, characterized in that: The vertical shaft is a HDPE double-wall corrugated pipe.

7. The aeration sludge drainage sewage treatment well according to claim 1, characterized in that: The distance between the mud inlet pipe section and the bottom of the vertical shaft is 80 to 120 mm, and the distance between the communication position between the aeration pipe and the mud discharge pipe section and the bottom of the vertical shaft is 300 to 500 mm.

8. A high-load artificial wetland, characterized in that: It comprises a treatment pool, in which an aerated sludge sewage treatment well as described in any one of claims 1 to 7 is arranged, the vertical shafts are arranged in a matrix in the treatment pool, the outside of the vertical shafts is filled with a wetland matrix, and the layer height of the wetland matrix is ​​less than the height of the vertical shafts.

9. The high-load artificial wetland according to claim 8, characterized in that: The center distance between two adjacent vertical shafts is 1500-4000 mm, and the diameter of the vertical shaft is 315 mm.

10. The high-load artificial wetland according to claim 8, characterized in that: The wetland matrix is ​​volcanic rock particles.

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