Aeration tank and sewage treatment system

Abstract

An aeration tank and a sewage treatment system are characterized in that an anoxic regulation and control mechanism and an aerobic regulation and control mechanism are arranged in an aeration tank body, the anoxic regulation and control mechanism can create an anoxic environment around the anoxic regulation and control mechanism so that the area becomes an anoxic section, and the aerobic regulation and control mechanism creates an aerobic environment around the aerobic regulation and control mechanism so that the area forms an aerobic section; in the process that sewage flows along the channel, the sewage sequentially passes through the anoxic zone and the aerobic zone, in the anoxic zone, most nitrate radicals and nitrite radicals in the sewage are reduced into nitrogen by denitrifying bacteria in activated sludge, and nitrogen elements in the sewage are removed; in the aerobic section, most ammonium nitrogen in the sewage is converted into nitrate and nitrite by nitrifying bacteria in the activated sludge, and nitrogen in the sewage is further converted and removed; the denitrification effect of the anoxic section and the nitrification effect of the aerobic section are synergistically carried out, so that nitrogen elements in sewage can be more effectively removed, the denitrification efficiency is greatly improved, up-to-standard discharge of the sewage is ensured, and eutrophication pollution to a water body is reduced.

Description

An aeration tank and wastewater treatment system Technical Field

[0001] This application relates to the field of wastewater treatment technology, specifically to an aeration tank and a wastewater treatment system. Background Technology

[0002] With increasingly stringent environmental standards, the requirements for wastewater discharge are becoming more demanding, especially for key indicators such as chemical oxygen demand (COD), total nitrogen, and ammonia nitrogen. Various manufacturing enterprises (such as paper mills) must invest in effective wastewater treatment systems to ensure compliance with discharge standards; otherwise, they will face hefty fines and production restrictions. The stable operation of wastewater treatment systems is crucial for the sustainable development of enterprises. Against the backdrop of continuously expanding industrial production scale, wastewater generation is also constantly increasing, which requires wastewater treatment systems with higher treatment capacity and stability.

[0003] Existing wastewater treatment systems typically employ at least one biological treatment unit to meet wastewater treatment needs. The aeration tank plays a central role within this unit, specifically treating the wastewater generated. However, existing aeration tanks have limitations in their structural and functional design. Their internal structure only includes an aerobic zone, lacking an anoxic zone. This means that activated sludge can only perform normal nitrification in such an environment, unable to achieve denitrification (the process by which microorganisms reduce nitrates or nitrites to nitrogen gas under anoxic conditions, helping to remove nitrogen from wastewater). Due to the lack of denitrification, the total nitrogen content in the effluent from the aeration tank is often high, posing a risk of exceeding standards. Excessive total nitrogen in the aeration tank effluent directly threatens the compliance of the entire wastewater treatment system's external discharge of total nitrogen. To effectively control the total nitrogen in the discharged wastewater to meet standards, the commonly used method is to strictly control the dosage of urea, the nitrogen source required by the biological treatment process, specifically by adding less or even no urea. However, this approach also introduces a series of new problems. When urea is added in insufficient or no quantity for an extended period, the microorganisms in the anaerobic reactors and aeration tanks of the biological treatment unit will suffer from a severe lack of nitrogen (N) source. This lack of N source will have a significant negative impact on the efficiency of microorganisms in degrading COD (Chemical Oxygen Demand), leading to a substantial decrease in degradation efficiency. This not only affects the stable operation of the entire wastewater treatment system but also increases the chemical consumption of subsequent advanced treatment systems, further raising the cost and difficulty of wastewater treatment. Summary of the Invention

[0004] In view of the above problems, this application provides an aeration tank to solve the problem that activated sludge cannot achieve denitrification due to the lack of anoxic zone in the aeration tank.

[0005] To achieve the above objectives, the inventors provide an aeration tank, comprising an aeration tank body and at least one anoxic control mechanism and an aerobic control mechanism disposed within the aeration tank body. The aeration tank body has an inlet end and an outlet end, and the aeration tank body has a channel guiding sewage to flow from the inlet end to the outlet end. The anoxic control mechanism and the aerobic control mechanism are sequentially arranged on the channel along the sewage flow direction, so that an anoxic section is formed around the anoxic control mechanism and an aerobic section is formed around the aerobic control mechanism. The anoxic control mechanism includes a flow promoter and / or a variable frequency aerator; the aerobic control mechanism includes a high frequency aerator.

[0006] Furthermore, the anoxic control mechanism further includes a first dissolved oxygen sensor and a first controller. The first dissolved oxygen sensor is located in the anoxic section to monitor the dissolved oxygen concentration in the wastewater in the anoxic section in real time, and the first dissolved oxygen sensor is electrically connected to the first controller. The variable frequency aerator and / or the flow pump is electrically connected to the first controller. The aerobic control mechanism further includes a second dissolved oxygen sensor and a second controller. The second dissolved oxygen sensor is located in the aerobic section to monitor the dissolved oxygen concentration in the wastewater in the aerobic section in real time, and the second dissolved oxygen sensor is electrically connected to the second controller. The high-frequency aerator is electrically connected to the first controller.

[0007] Furthermore, the aeration tank also includes at least one internal return pipe, one end of which is connected to the inlet end of the aeration tank body, and the other end of which is connected to the outlet end of the aeration tank body; the internal return pipe is equipped with an internal return pump to return part of the sewage at the outlet end of the aeration tank body to the anoxic section at the inlet end of the aeration tank body.

[0008] Furthermore, the hypoxia regulation mechanism is located at the inlet end.

[0009] Furthermore, the channel is S-shaped.

[0010] Furthermore, the aeration tank is provided with several guide plates, which divide the aeration tank into S-shaped channels.

[0011] Furthermore, at least one hypoxia regulation mechanism or aerobic regulation mechanism is provided between adjacent guide plates.

[0012] This application also provides a wastewater treatment system, which includes a first aeration tank and a first sedimentation tank and a first sludge well corresponding to the first aeration tank. The first aeration tank is the aforementioned aeration tank. The first aeration tank is provided with a first effluent pipe leading to the first sedimentation tank, so that the first sedimentation tank receives wastewater from the aeration tank body of the first aeration tank and separates activated sludge and clarified water by gravity sedimentation. The first sludge well is connected to the first sedimentation tank to collect the activated sludge discharged from the first sedimentation tank. The first sludge well is provided with at least one first sludge return pipe leading to the inlet end of the aeration tank body of the first aeration tank, and the first sludge return pipe is provided with a first sludge return pump to regulate the return of activated sludge to the aeration tank body of the first aeration tank.

[0013] Furthermore, it also includes a second aeration tank and a second sedimentation tank and a second sludge well corresponding to the second aeration tank. The second aeration tank is the aforementioned aeration tank. The second aeration tank is provided with a second effluent pipe leading to the second sedimentation tank, so that the second sedimentation tank receives the wastewater from the aeration tank body in the second aeration tank and separates the activated sludge from the clarified water through gravity sedimentation. The second sludge well is connected to the second sedimentation tank to collect the activated sludge discharged from the second sedimentation tank. The second sludge well is provided with at least one second sludge return pipe leading to the inlet end of the aeration tank body in the second aeration tank, and the second sludge return pipe is provided with a second sludge return pump to regulate the return of activated sludge to the aeration tank body of the second aeration tank. At least one first sludge return pipe is connected to the second sludge return pipe through a connecting pipe, and the connecting pipe is provided with a sludge valve.

[0014] Unlike existing technologies, the above-mentioned technical solution incorporates anoxic and aerobic control mechanisms within the aeration tank. The anoxic control mechanism creates an anoxic environment around the tank, establishing an anoxic zone and providing suitable conditions for denitrification by the activated sludge. Conversely, the aerobic control mechanism creates an aerobic environment around the tank, establishing an aerobic zone and providing suitable conditions for nitrification by the activated sludge. As wastewater flows along the channel, it sequentially passes through the anoxic and aerobic zones. In the anoxic zone, denitrifying bacteria in the activated sludge reduce most of the nitrate and nitrite ions in the wastewater. Nitrogen gas is used to remove nitrogen from wastewater. In the aerobic section, nitrifying bacteria in the activated sludge convert most of the ammonium nitrogen in the wastewater into nitrate and nitrite, further converting and removing nitrogen from the wastewater. At the same time, aerobic microorganisms in the aerobic section further decompose the organic matter in the wastewater into simple inorganic substances (such as carbon dioxide and water), thereby achieving wastewater purification. Through the synergistic action of denitrification in the anoxic section and nitrification in the aerobic section, nitrogen in the wastewater can be removed more effectively, significantly improving denitrification efficiency, ensuring that wastewater meets discharge standards, and reducing eutrophication pollution of water bodies.

[0015] The above description of the utility model is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0016] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of this utility model and other related contents, and should not be considered as limitations on this application.

[0017] In the accompanying drawings of the instruction manual:

[0018] Figure 1 is a schematic diagram of the aeration tank structure described in the specific embodiment;

[0019] Figure 2 is a schematic diagram of the aeration tank structure described in the specific embodiment;

[0020] Figure 3 is a schematic diagram of the wastewater treatment system structure described in the specific embodiment;

[0021] Figure 4 is a schematic diagram of the wastewater treatment system structure described in the specific embodiment;

[0022] Figure 5 is an enlarged view of point A in Figure 4.

[0023] The reference numerals used in the above figures are explained as follows:

[0024] 10. Aeration tank;

[0025] 101. Aeration tank body;

[0026] 1011. Import end; 1012. Export end;

[0027] 102. Hypoxia regulation mechanism;

[0028] 103. Aerobic regulation mechanism;

[0029] 104. Deflector plate;

[0030] 105. Internal reflux pipe;

[0031] 106. Internal reflux pump;

[0032] 10a. First aeration tank;

[0033] 10a1, First water outlet pipe;

[0034] 10b. Second aeration tank;

[0035] 10b1, Second water outlet pipe;

[0036] 20a. First sedimentation tank;

[0037] 20b. Second sedimentation tank;

[0038] 30a, First Sludge Well;

[0039] 30a1, First sludge return pipe; 30a2, First sludge return pump;

[0040] 30b, Second sludge well;

[0041] 30b1, Second sludge return pipe; 30b2, Second sludge return pump;

[0042] 40. Connecting pipe;

[0043] 50. Sludge valve. Detailed Implementation

[0044] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0045] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0046] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0047] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0048] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0049] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar open-ended expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0050] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0051] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0052] Unless otherwise expressly specified or limited, the terms "installation," "connection," "communication," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "communication" can be a fixed connection, a detachable connection, or an integral setting; it can be a direct connection or an indirect connection through an intermediate medium; it can be a relationship of two components combined together, an interaction relationship between two components, or a connection within two structures. Those skilled in the art to which this application pertains can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0053] Referring to Figures 1-5, an aeration tank 10 includes an aeration tank body 101 and an anoxic regulation mechanism 102 and an aerobic regulation mechanism 103 disposed within the aeration tank body 101. The anoxic regulation mechanism 102 creates an anoxic environment around itself, making this area an anoxic zone, thus creating suitable conditions for denitrification of activated sludge. The aerobic regulation mechanism 103 creates an aerobic environment around itself, making this area an aerobic zone, thus creating suitable conditions for nitrification of activated sludge. As wastewater flows along the channel, it passes through the anoxic zone and the aerobic zone sequentially. In the anoxic zone, denitrifying bacteria in the activated sludge denitrify the wastewater. In the aerobic stage, most of the nitrate and nitrite ions in the water are reduced to nitrogen gas, removing nitrogen from the wastewater. In the aerobic stage, nitrifying bacteria in the activated sludge convert most of the ammonium nitrogen in the wastewater into nitrate and nitrite ions, further converting and removing nitrogen from the wastewater. At the same time, aerobic microorganisms in the aerobic stage further decompose the organic matter in the wastewater into simple inorganic substances (such as carbon dioxide and water), thereby achieving wastewater purification. Through the synergistic action of denitrification in the anoxic stage and nitrification in the aerobic stage, nitrogen in the wastewater can be removed more effectively, significantly improving denitrification efficiency, ensuring that wastewater meets discharge standards, and reducing eutrophication pollution of water bodies.

[0054] Referring to Figure 1, an embodiment of an aeration tank 10 is provided below, which includes an aeration tank body 101 and at least one anoxic regulation mechanism 102 and an aerobic regulation mechanism 103 disposed within the aeration tank body 101. The aeration tank body 101 has an inlet end 1011 and an outlet end 1012, and the aeration tank body 101 has a channel guiding sewage to flow from the inlet end 1011 to the outlet end 1012. The anoxic regulation mechanism 102 and the aerobic regulation mechanism 103 are sequentially arranged on the channel along the sewage flow direction, so that an anoxic section is formed around the anoxic regulation mechanism 102 and an aerobic section is formed around the aerobic regulation mechanism 103. The anoxic regulation mechanism 102 includes a flow promoter and / or a variable frequency aerator; the aerobic regulation mechanism 103 includes a high frequency aerator.

[0055] The aforementioned anoxic control mechanism 102 and aerobic control mechanism 103 are sequentially arranged on the channel along the sewage flow direction. This means that the anoxic control mechanism 102 and aerobic control mechanism 103 are installed on the sewage flow channel and arranged sequentially according to the sewage flow direction, forming an anoxic section and an aerobic section in sequence on the sewage flow channel. As the sewage flows along the channel, it will pass through the anoxic section and the aerobic section in sequence. In the anoxic section, the denitrifying bacteria in the activated sludge reduce most of the nitrate and nitrite in the sewage to nitrogen gas, removing nitrogen from the sewage. In the aerobic section, the nitrifying bacteria in the activated sludge convert most of the ammonium nitrogen in the sewage into nitrate and nitrite, further converting and removing nitrogen from the sewage.

[0056] The aforementioned hypoxia regulation mechanism 102 is used to create an hypoxia zone around it. The hypoxia regulation mechanism 102 includes a flow pump and / or a variable frequency aerator, meaning:

[0057] In some embodiments, the anoxic control mechanism 102 may include a variable frequency aerator. The main function of the variable frequency aerator is to oxygenate the wastewater in the aeration tank 10. It uses a motor to drive impellers, rotating brushes, and other components to rotate, causing the wastewater in the aeration tank 10 to agitate, drawing air into the water, and allowing oxygen from the air to dissolve into the wastewater, thus providing oxygen to the wastewater. The oxygenation capacity of the variable frequency aerator is closely related to its operating frequency. When the variable frequency aerator operates at a low frequency, the rotational speed of the impeller or rotating brushes will decrease. After the wastewater enters the aeration tank 10, the microorganisms therein will consume dissolved oxygen for metabolic activities. Around the anoxic control mechanism 102 (near the inlet end 1011), because the oxygenation is reduced when the variable frequency aerator operates at a low frequency, while the oxygen consumption of the microorganisms is relatively stable, the rate of consumption and replenishment of dissolved oxygen in the wastewater is balanced, and the dissolved oxygen is always maintained at the low level required for an anoxic environment. The aforementioned variable frequency aerator can be an impeller aerator or a rotating brush aerator, etc.

[0058] In some embodiments, the anoxic control mechanism 102 includes a flow promoter that provides propulsion to make water flow from the inlet end 1011 to the outlet end 1012, so as to uniformly introduce some oxygen to achieve an anoxic environment, inhibit the local accumulation of oxygen, and prevent excessive oxygen consumption due to uneven sewage flow. At the same time, the shear force and kinetic energy generated by the flow promoter can effectively prevent sludge from depositing at the bottom.

[0059] In some embodiments, the anoxic control mechanism 102 includes a flow promoter and a variable frequency aerator. Combining the flow promoter and the variable frequency aerator leverages their synergistic advantages, creating an anoxic environment more precisely and efficiently and improving wastewater treatment. By coordinating the flow promoter and the variable frequency aerator, when wastewater enters the aeration tank 10, the variable frequency aerator starts at a low frequency to reduce oxygenation, while the flow promoter simultaneously starts, propelling the wastewater at a suitable flow rate. The flow disturbance from the flow promoter further inhibits local oxygen accumulation, and combined with the reduced oxygenation effect of the low-frequency operation of the variable frequency aerator, this allows the dissolved oxygen around the anoxic control mechanism 102 to more quickly and stably reach anoxic conditions.

[0060] The preferred anoxic control mechanism 102 is located at the inlet end 1011. During operation, the anoxic control mechanism 102 promotes the flow of activated sludge in the wastewater, preventing sludge accumulation at the inlet end 1011, reducing sludge aging and putrefaction, and allowing the microorganisms in the activated sludge to have more thorough and uniform contact with the wastewater. Pollutants at different locations in the wastewater can be decomposed by microorganisms in a timely manner, improving the efficiency and effectiveness of wastewater treatment, ensuring that organic matter, nitrogen, phosphorus, and other pollutants in the wastewater are efficiently removed, and improving the quality of the effluent.

[0061] The aforementioned aerobic control mechanism 103 is used to create an aerobic zone around it. The aerobic control mechanism 103 includes a high-frequency aerator, which oxygenates the wastewater in the aeration tank 10. It uses a motor to drive impellers, rotating brushes, and other components to rotate at high speed, causing the wastewater in the aeration tank 10 to be rapidly agitated. A large amount of air is drawn into the water, allowing oxygen from the air to quickly dissolve into the wastewater, providing sufficient oxygen to create an aerobic zone around the aerobic control mechanism 103. The aforementioned high-frequency aerator can be an impeller-type aerator, a rotating brush-type aerator, etc.

[0062] In some embodiments, to maintain the dissolved oxygen in the wastewater surrounding the anoxic control mechanism 102 at anoxic conditions of 0.2-0.5 mg / L, ensuring efficient denitrification during wastewater treatment and improving the overall wastewater treatment effect, the anoxic control mechanism 102 further includes a first dissolved oxygen sensor and a first controller. The first dissolved oxygen sensor is located in the anoxic section to monitor the dissolved oxygen concentration in the wastewater in the anoxic section in real time, and the first dissolved oxygen sensor is electrically connected to the first controller. The variable frequency aerator and / or the flow booster are electrically connected to the first controller. The first dissolved oxygen sensor monitors the dissolved oxygen concentration in the aerobic section wastewater in real time and transmits the data to the first controller through a data transmission module. Taking the variable frequency aerator as an example, when the detected dissolved oxygen concentration is higher than 0.5 mg / L, the first controller controls the variable frequency aerator to further reduce its operating frequency and reduce the aeration volume; when the dissolved oxygen concentration is lower than 0.2 mg / L, the variable frequency aerator appropriately increases its operating frequency and increases the aeration volume. It enables real-time monitoring and precise control of dissolved oxygen, ensuring that the dissolved oxygen in wastewater remains stable within the anoxic range of 0.2-0.5 mg / L. Through automated control, it improves wastewater treatment efficiency and stability, reducing manual intervention. It can promptly adjust operating parameters based on changes in wastewater quality and quantity, demonstrating strong adaptability.

[0063] In some embodiments, a second dissolved oxygen sensor and a second controller are also installed in the aerobic section to control the dissolved oxygen level in the aerobic section, preventing excessively high dissolved oxygen levels that would waste electricity. Excessive high-intensity aeration can also cause activated sludge to disperse. The dissolved oxygen level in the aerobic section is generally controlled at around 1.8-2.2 mg / L. Specifically, the aerobic control mechanism 103 further includes a second dissolved oxygen sensor and a second controller. The second dissolved oxygen sensor is located in the aerobic section to monitor the dissolved oxygen concentration in the wastewater in the aerobic section in real time. The second dissolved oxygen sensor is electrically connected to the second controller; the high-frequency aerator is also electrically connected to the second controller. The second dissolved oxygen sensor monitors the dissolved oxygen concentration in the wastewater in the aerobic section in real time and transmits the data to the second controller via a data transmission module. When the dissolved oxygen concentration is detected to be higher than 2.2 mg / L, the second controller controls the high-frequency aerator to reduce its operating power or operating time (by reducing the aerator impeller speed, adjusting the opening and closing of the air inlet valve, or intermittently starting and stopping the equipment), thus reducing the aeration volume. When the dissolved oxygen concentration is lower than 1.8 mg / L, the second controller controls the high-frequency aerator to increase its operating power or operating time, thus increasing the aeration volume. This achieves real-time monitoring and precise control of dissolved oxygen in the aerobic section, ensuring that the dissolved oxygen in the wastewater remains stable within the anoxic environment range of 1.8-2.2 mg / L. Through automated control, wastewater treatment efficiency and stability are improved, and manual intervention is reduced. The system can adjust operating parameters promptly according to changes in wastewater quality and quantity, demonstrating strong adaptability.

[0064] Referring to Figure 2, in order to further reduce the total nitrogen content in the wastewater, in some embodiments, the aeration tank 10 further includes at least one internal return pipe 105, one end of which is connected to the inlet end 1011 of the aeration tank body 101, and the other end is connected to the outlet end 1012 of the aeration tank body 101; the internal return pipe 105 is equipped with an internal return pump 106 to return part of the wastewater at the outlet end 1012 of the aeration tank body 101 to the anoxic section at the inlet end 1011 of the aeration tank 10. The aeration tank 10 converts ammonium nitrogen in the water into nitrate and nitrite through a digestion reaction. The effluent from the aeration tank 10 containing nitrate and nitrite is then returned to the anoxic zone at the inlet 1011 of the aeration tank 10 via the internal return pump 106. Under anoxic conditions, microorganisms further convert nitrate and nitrite in the water into nitrogen gas through denitrification, which is then removed from the water, resulting in a significant reduction in the total nitrogen content in the water and achieving the purpose of denitrification.

[0065] The channel is used to guide the flow of wastewater from the inlet 1011 to the outlet 1012, ensuring the orderly transfer and treatment of wastewater within the aeration tank 10. Considering different process requirements and treatment objectives, the shape of the channel is not strictly limited; it can be straight, S-shaped, or U-shaped, among other forms. Referring to Figures 1 and 2, the channel is preferably S-shaped. The S-shaped channel significantly increases the flow path length of wastewater within the aeration tank 10. Compared to simpler channels such as straight channels, wastewater needs to travel a longer distance from the inlet 1011 to the outlet 1012, allowing for more thorough contact between microorganisms and wastewater. This provides more sufficient reaction time for the microorganisms and pollutants in the wastewater, enabling more complete biochemical reactions such as nitrification, denitrification, and organic matter decomposition, thereby improving wastewater treatment efficiency.

[0066] Meanwhile, the S-shaped channel constantly changes the direction of the wastewater during its flow, generating turbulence and eddies. This promotes thorough mixing of wastewater with activated sludge and dissolved oxygen, preventing problems such as short-circuiting and dead zones. Whether it's the denitrification reaction in the anoxic zone or the nitrification and organic matter degradation in the aerobic zone, the more uniform mixing improves reaction efficiency, ensuring that pollutants in the wastewater are removed efficiently.

[0067] Referring to Figures 1 and 2, specifically, several guide plates 104 can be provided within the aeration tank 101, dividing the aeration tank 101 into S-shaped channels. Preferably, at least one anoxic control mechanism 102 or aerobic control mechanism 103 is provided between adjacent guide plates 104. That is, the arrangement of the guide plates 104 causes the wastewater to form an S-shaped channel within the aeration tank 10. The S-shaped channel can be divided into multiple segments by several guide plates 104, and a segment (part of the S-shaped channel) is formed between adjacent guide plates 104. One or more control mechanisms are provided in this segment, and the specific arrangement can be determined according to the length and width of the segment. For example, if the S-shaped channel is divided into three segments by two guide plates 104, the first segment can be sequentially equipped with anoxic control mechanism 102 and aerobic control mechanism 103, and the second and third segments can be equipped with two aerobic control mechanisms 103 and one aerobic control mechanism 103, respectively. Setting up anoxic control mechanisms 102 or aerobic control mechanisms 103 between adjacent guide plates 104 promotes the flow of sewage and activated sludge in the channel between adjacent guide plates 104, allowing the sewage and microorganisms in the activated sludge to come into more thorough and uniform contact during the flow process. Whether it's denitrifying microorganisms in the anoxic zone or nitrifying microorganisms in the aerobic zone, they can promptly contact and decompose pollutants in the sewage, improving the removal efficiency of pollutants by microorganisms and ensuring that pollutants such as organic matter, nitrogen, and phosphorus in the sewage are efficiently removed, thus improving the effluent quality. At the same time, it effectively prevents activated sludge from accumulating in local areas of the aeration tank 10 (such as at the inlet end 1011 or the corner of the S-shaped channel). By keeping the sludge in a flowing state, the microorganisms in the sludge are always in a good living environment, constantly in contact with fresh sewage, thereby maintaining their activity, reducing sludge aging and putrefaction, lowering sludge treatment costs, and also helping to maintain the stable operation of the sewage treatment system.

[0068] Referring to Figure 3, this application also provides a wastewater treatment system that utilizes the aforementioned aeration tank 10 structure. Specifically, it includes a first aeration tank 10a and a first sedimentation tank 20a and a first sludge well 30a corresponding to the first aeration tank 10a. The first aeration tank 10a is provided with a first effluent pipe 10a1 leading to the first sedimentation tank 20a, so that the first sedimentation tank 20a receives wastewater from the outlet end 1012 of the aeration tank body 101 in the first aeration tank 10a, and separates activated sludge from wastewater through gravity sedimentation. Clarified water; the first sludge well 30a is connected to the first sedimentation tank 20a to collect the activated sludge discharged from the first sedimentation tank 20a; the first sludge well 30a is provided with at least one first sludge return pipe 30a1 leading to the inlet end 1011 of the aeration tank body 101 in the first aeration tank 10a, and the first sludge return pipe 30a1 is provided with a first sludge return pump 30a2 to regulate the return of activated sludge to the aeration tank body 101 of the first aeration tank 10a through the first sludge return pump 30a2.

[0069] The aforementioned first sludge return pipe 30a1 has at least one branch; taking three branches as an example, they are designated A-1#, A-2#, and A-3#. Therefore, the connection between the first sludge well 30a and the first aeration tank 10a is as follows:

[0070] The first sludge well 30a is connected to the first aeration tank 10a through the first sludge return pipes 30a1 of A-1#, A-2#, and A-3#, and the first sludge return pumps 30a2 are respectively installed on A-1#, A-2#, and A-3#.

[0071] In some embodiments, in order to more specifically treat wastewater from different stages or sources, and improve treatment efficiency and effectiveness. Referring to Figure 4, the wastewater treatment system further includes a second aeration tank 10b and a second sedimentation tank 20b and a second sludge well 30b corresponding to the second aeration tank 10b. The second aeration tank 10b is provided with a second effluent pipe 10b1 leading to the second sedimentation tank 20b, so that the second sedimentation tank 20b receives wastewater from the outlet end 1012 of the aeration tank body 101 in the second aeration tank 10b and separates activated sludge and clarified water by gravity sedimentation. The second sludge well 30b is connected to the second sedimentation tank 20b to collect the activated sludge discharged from the second sedimentation tank 20b. The second sludge well 30b is provided with at least one second sludge return pipe 30b1 leading to the inlet end 1011 of the aeration tank body 101 in the second aeration tank 10b, and the second sludge return pipe 30b1 is provided with a second sludge return pump 30b2 to regulate the return of activated sludge to the aeration tank body 101 of the second aeration tank 10b.

[0072] The aforementioned second sludge return pipe 30b1 has at least one branch; taking three branches as an example, they are designated B-1#, B-2#, and B-3#. Therefore, the connection between the second sludge well 30b and the second aeration tank 10b is as follows:

[0073] The second sludge well 30b is connected to the second aeration tank 10b through the second sludge return pipes 30b1 of B-1#, B-2#, and B-3#, and the second sludge return pumps 30b2 are respectively installed on B-1#, B-2#, and B-3#.

[0074] Referring to Figure 5, to enable the free addition and subtraction of activated sludge, a connecting pipe 40 is installed between the first sludge return pipe 30a1 and the second sludge return pipe 30b1 to allow for the addition and subtraction of activated sludge in the first aeration tank 10a and the second aeration tank 10b via the first sludge return pipe 30a1 and the second sludge return pipe 30b1. Specifically, at least one first sludge return pipe 30a1 and the second sludge return pipe 30b1 are connected by the connecting pipe 40, and the connecting pipe 40 is equipped with a sludge valve 50. In embodiments where both the first sludge return pipe 30a1 and the second sludge return pipe 30b1 have three sections, a connecting pipe 40 is added between the first sludge return pipe 30a1 of A-3# and the second sludge return pipe 30b1 of B-1#, and a sludge valve 50 is installed on the connecting pipe 40. If one of the aeration tanks 10a and 10b malfunctions and the activated sludge has poor activity, sludge can be returned and adjusted from the other aeration tank 10 through the added connecting pipe 40. The activated sludge from the other aeration tank 10 can be quickly adjusted into the malfunctioning aeration tank 10 to achieve rapid recovery of the abnormal aeration system.

[0075] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. An aeration tank, characterized in that, The system includes an aeration tank and at least one anoxic control mechanism and an aerobic control mechanism disposed within the aeration tank. The aeration tank has an inlet and an outlet, and a channel within the aeration tank guides wastewater to flow from the inlet to the outlet. The anoxic control mechanism and the aerobic control mechanism are sequentially arranged on the channel along the wastewater flow direction, so that an anoxic section is formed around the anoxic control mechanism and an aerobic section is formed around the aerobic control mechanism. The anoxic control mechanism includes a flow promoter and / or a variable frequency aerator. The aerobic control mechanism includes a high-frequency aerator.

2. The aeration tank according to claim 1, characterized in that, The anoxic control mechanism further includes a first dissolved oxygen sensor and a first controller. The first dissolved oxygen sensor is located in the anoxic section to monitor the dissolved oxygen concentration in the wastewater in the anoxic section in real time. The first dissolved oxygen sensor is electrically connected to the first controller. The variable frequency aerator and / or the flow pump is electrically connected to the first controller. The aerobic control mechanism further includes a second dissolved oxygen sensor and a second controller. The second dissolved oxygen sensor is located in the aerobic section to monitor the dissolved oxygen concentration in the wastewater in the aerobic section in real time. The second dissolved oxygen sensor is electrically connected to the second controller. The high-frequency aerator is electrically connected to the first controller.

3. The aeration tank according to claim 1, characterized in that, The aeration tank also includes at least one internal return pipe, one end of which is connected to the inlet end of the aeration tank and the other end of which is connected to the outlet end of the aeration tank. An internal return pump is provided on the internal return pipe to return part of the sewage at the outlet end of the aeration tank to the anoxic section at the inlet end of the aeration tank.

4. The aeration tank of claim 1, wherein The hypoxia regulation mechanism is located at the inlet end.

5. The aeration tank of claim 1, wherein The channel is S-shaped.

6. The aeration tank according to claim 4, characterized in that, The aeration tank is equipped with several guide plates, which divide the aeration tank into S-shaped channels.

7. The aeration tank according to claim 6, characterized in that, At least one hypoxia regulation mechanism or aerobic regulation mechanism is provided between adjacent guide plates.

8. A wastewater treatment system, characterized in that, It includes a first aeration tank and a first sedimentation tank and a first sludge well corresponding to the first aeration tank. The first aeration tank is the aeration tank as described in any one of claims 1-5. The first aeration tank is provided with a first effluent pipe leading to the first sedimentation tank, so that the first sedimentation tank receives the sewage from the aeration tank body in the first aeration tank and separates the activated sludge and clarified water by gravity sedimentation. The first sludge well is connected to the first sedimentation tank to collect the activated sludge discharged from the first sedimentation tank; The first sludge well is provided with at least one first sludge return pipe leading to the inlet end of the aeration tank body in the first aeration tank, and the first sludge return pipe is provided with a first sludge return pump, so as to regulate the return of activated sludge to the aeration tank body of the first aeration tank through the first sludge return pump.

9. The wastewater treatment system according to claim 8, characterized in that, It also includes a second aeration tank and a second sedimentation tank and a second sludge well corresponding to the second aeration tank. The second aeration tank is the aeration tank described in any one of claims 1-5. The second aeration tank is provided with a second effluent pipe leading to the second sedimentation tank, so that the second sedimentation tank receives the sewage from the aeration tank body in the second aeration tank and separates the activated sludge and clarified water through gravity sedimentation. The second sludge well is connected to the second sedimentation tank to collect the activated sludge discharged from the second sedimentation tank; The second sludge well is provided with at least one second sludge return pipe leading to the inlet end of the aeration tank body in the second aeration tank, and the second sludge return pipe is provided with a second sludge return pump, so as to regulate the return of activated sludge to the aeration tank body of the second aeration tank through the second sludge return pump. At least one first sludge return pipe is connected to a second sludge return pipe via a connecting pipe, and the connecting pipe is equipped with a sludge valve.

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