Aeration stirring type integrated water treatment equipment

Abstract

The utility model discloses aeration stirring type integrated water treatment equipment, relates to the field of water treatment equipment, and in order to achieve the purpose, the water treatment equipment comprises a tank body, and the interior of the tank body is divided into a water inlet settling chamber, a first aeration chamber and a second aeration chamber. The bottoms of the water inlet settling chamber, the first aeration chamber and the second aeration chamber are communicated with one another, and the tops of the water inlet settling chamber, the first aeration chamber and the second aeration chamber realize stepped water supply through the first water collecting tank and the second water collecting tank, so that an efficient water treatment flow is formed. Specifically, the water inlet settling chamber is divided into an upper area and a lower area through a partition plate, and the upper area and the lower area are separated. The equipment is suitable for municipal sewage treatment, industrial wastewater treatment and various water treatment scenes, can effectively improve the water treatment efficiency, reduce the operation cost of the equipment and reduce the abrasion of the equipment, and has a wide application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water treatment equipment, in particular to an aeration stirring integrated water treatment equipment, especially an integrated water treatment device for efficient mixing, precipitation and separation of sewage and chemical liquid through aeration stirring. BACKGROUND

[0002] At present, water treatment tanks play an important role in the field of water treatment, mainly used for flocculation, precipitation and separation of sewage and other treatment processes. The existing water treatment tank usually uses mechanical stirring device to realize the mixing of chemical liquid and sewage, so as to improve the reaction efficiency and speed. The mechanical stirring device makes sewage and chemical liquid fully contact and mix uniformly through the mechanical movement of rotating blades or stirring paddles. This stirring method can meet the needs of water treatment to some extent, but there are many deficiencies in actual application.

[0003] Firstly, the structure of mechanical stirring device is relatively complex, usually equipped with motor, reducer, transmission shaft and other components, which not only increases the manufacturing cost of equipment, but also makes the installation and maintenance of equipment cumbersome.

[0004] Secondly, the mechanical stirring device will produce large vibration and noise during operation, which may cause loosening or damage of equipment components after long-term use, increasing the failure rate and maintenance cost of equipment.

[0005] In addition, the high-speed rotation of mechanical stirring device will cause the rapid flow of silt in the tank, which not only easily causes the wear of inner wall and internal components of tank, but also may affect the precipitation effect, leading to the decrease of treatment efficiency. Especially in the treatment of high concentration silt sewage, the wear problem of mechanical stirring device is particularly prominent, and even may cause equipment failure in severe cases.

[0006] Finally, the energy consumption of mechanical stirring device is high, especially in large-scale water treatment scene, long-term operation will significantly increase the operation cost, limiting its economy and sustainability.

[0007] In view of the deficiencies of the prior art, it is of great significance to develop a new type of water treatment tank structure. CONTENT OF THE INVENTION

[0008] The purpose of the present application is to overcome at least one deficiency of the prior art, provide an aeration stirring integrated water treatment equipment, which is suitable for municipal sewage treatment, industrial wastewater treatment and various water treatment scenes, can effectively improve the water treatment efficiency, reduce the equipment operation cost and reduce the equipment wear, and has wide application prospect.

[0009] To achieve the above object, the application discloses an aeration stirring integrated water treatment equipment, which comprises a tank body, and the tank body is internally partitioned into a water inlet sedimentation chamber, a first aeration chamber and a second aeration chamber.

[0010] The bottom of the water inlet sedimentation chamber, the first aeration chamber and the second aeration chamber are communicated with each other, and the top is realized step-by-step water feeding through a first water collecting groove and a second water collecting groove, so that an efficient water treatment process is formed.

[0011] Specifically, the water inlet sedimentation chamber is divided into an upper area and a lower area by a partition plate, and the upper area and the lower area are partitioned.

[0012] The upper area is provided with an upper layer grid plate and a lower layer grid plate, the upper layer grid plate is used for filtering larger foreign matters, and the lower layer grid plate is used for secondary filtering and has a smaller grid size than the upper layer grid plate.

[0013] The lower area is provided with a slant pipe assembly, the upper area is inserted into the lower area through a vertical pipeline, and the water outlet of the pipeline is lower than the slant pipe assembly, so that the sewage and flocculation liquid can be fully mixed.

[0014] The upper area of the water inlet sedimentation chamber is provided with a tee pipe near the upper edge, one end of the tee pipe is used for connecting the sewage to be treated, the other end is used for adding the flocculation liquid, and the third end is used for feeding the mixed sewage and liquid into the water inlet sedimentation chamber. The design not only improves the pretreatment efficiency of the sewage, but also ensures the full mixing of the liquid and the sewage, and lays a foundation for subsequent treatment.

[0015] Further, the bottom of the first aeration chamber and the second aeration chamber is provided with a grid plate, the grid plate can control most of the sludge at the bottom of the tank body and reduce backflow.

[0016] The first water collecting groove and the second water collecting groove are provided with auxiliary pipelines, the water outlets of the auxiliary pipelines are lower than the grid plate, and the auxiliary pipelines are used for feeding water from the bottom to the first aeration chamber and the second aeration chamber.

[0017] The first aeration chamber and the second aeration chamber are provided with an aeration assembly near the bottom area, the aeration assembly comprises at least one aeration pipe and an air inlet pipe connected with an external air inlet equipment or device.

[0018] The aeration pipe is provided with an air outlet hole opening downwardly, air bubbles and air flow are fed into the tank body through the air outlet hole, aeration stirring is realized, and the reaction efficiency and speed are improved.

[0019] The second aeration chamber is provided with a backwater pipe near the upper edge, which is used for discharging the treated clean water. The structure design not only ensures the effective control of the sludge, but also realizes the efficient water treatment effect through aeration stirring.

[0020] More specifically, the water inlet sedimentation chamber is communicated with the top of the first aeration chamber through a first water collecting tank, and the first aeration chamber is communicated with the second aeration chamber through a second water collecting tank. The height of the first water collecting tank is higher than that of the second water collecting tank, which ensures that the water can flow smoothly from the water inlet sedimentation chamber to the second aeration chamber in a step-by-step manner. The upper end of the first partition plate is higher than that of the second partition plate, and the first water collecting tank is installed on the upper edge of the first partition plate, and the second water collecting tank is installed on the upper edge of the second partition plate, forming a step-by-step water flow path. This design not only optimizes the direction and speed of the water flow, but also ensures the continuity and stability of the water treatment process.

[0021] Furthermore, the water inlet sedimentation chamber, the first aeration chamber and the second aeration chamber are separated by the first partition plate and the second partition plate located in the tank body.

[0022] Specifically, the first partition plate cooperates with the tank body to form the water inlet sedimentation chamber, the first partition plate cooperates with the second partition plate to form the first aeration chamber, and the second partition plate cooperates with the tank body to form the second aeration chamber.

[0023] Compared with the prior art, the present application adopts aeration stirring instead of traditional mechanical stirring, which has significant beneficial technical effects. Specifically, the aeration stirring sends bubbles and airflow into the tank body, and uses the rising and diffusion of the bubbles to realize the mixing and stirring of the sewage. The aeration stirring not only has a simple structure and does not need complex mechanical devices, but also has good stirring effect, which can make the liquid medicine and the sewage fully mixed, significantly improve the reaction efficiency and speed. Further, the aeration stirring uniformly distributes bubbles in the tank body through the aeration pipe, and the bubbles drive the water flow during the rising process, forming a gentle and uniform stirring effect, which avoids the rapid flow of mud and sand caused by mechanical stirring, reduces the wear of the inner wall and internal components of the tank, and prolongs the service life of the equipment. In addition, the aeration stirring has low energy consumption, which can significantly reduce the operating cost, and is especially suitable for large-scale water treatment scenarios. At the same time, the aeration stirring has the advantages of stable operation, low noise and easy maintenance, which further improves the reliability and economy of the equipment, and provides an efficient, energy-saving and economical solution for the water treatment industry.

[0024] In summary, the present application optimizes the structural design and adopts the aeration stirring technology to provide a water treatment equipment with strong functionality, compact structure and high economic efficiency, which is suitable for various sewage treatment scenarios and has wide application prospect and promotion value.

[0025] The above-listed beneficial effects are not exhaustive of all advantages. Other potential beneficial effects and detailed technical implementation methods will be further disclosed in the examples or other description parts of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] Aspects of the present disclosure will become more fully understood from the detailed description and accompanying drawings. The drawings are intended for illustrative purposes only and the dimensions, positions, and / or relative sizes of the structures shown in the drawings are not necessarily to scale. In the drawings:

[0027] Figure 1 is a schematic diagram of the internal structure of an embodiment of the present disclosure.

[0028] Figure 2 is a schematic diagram of the cross-sectional structure of an aeration pipe in an embodiment of the present disclosure.

[0029] The reference numerals in the drawings are as follows:

[0030] 1 - tank body, 2 - first partition, 3 - second partition, 4 - water inlet sedimentation chamber, 5 - first aeration chamber, 6 - second aeration chamber, 7 - sludge discharge pipe, 8 - aeration pipe, 9 - tee pipe, 10 - upper grid plate, 11 - lower grid plate, 12 - inclined pipe assembly, 13 - grid plate, 14 - first water collection tank, 15 - second water collection tank, 16 - air vent, 17 - pipe, 18 - return pipe, 19 - air inlet pipe, 20 - distribution pipe, 21 - upper zone, 22 - lower zone. DETAILED DESCRIPTION

[0031] The present disclosure will be described with reference to the accompanying drawings, which show several embodiments of the present disclosure. It should be understood, however, that the present disclosure can be presented in many different forms and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure of the present disclosure more complete and to fully inform those skilled in the art of the scope of the present disclosure. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide additional embodiments.

[0032] It should be understood that, in all the drawings, the same reference numerals indicate the same elements. In the drawings, the dimensions of certain features can be distorted for the sake of clarity.

[0033] It should be understood that the language used in the specification is only for describing specific embodiments and is not intended to limit the present disclosure. Unless otherwise defined, all terms (including technical and scientific terms) used in the specification have the meanings commonly understood by those skilled in the art. For the sake of brevity and / or clarity, techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered part of the description of the application.

[0034] As used in the specification, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. As used in the specification, the language "includes" and / or "comprising," or "containing" together with their conjugates mean that the product includes some, but not necessarily all of the features where the term is used. As used in the specification, the language "and / or" comprises any and all combinations of one or more of the associated listed items.

[0035] Referring to the drawings Figure 1 The embodiment discloses an exemplary structure of an aeration and agitation integrated water treatment device. The device body is an integrated tank 1, and the tank material is glass fiber reinforced plastic to ensure sufficient structural strength and durability under normal or low pressure operating conditions. The tank shape can be cylindrical or rectangular, and the tank wall thickness is usually between 10 mm and 30 mm. Those skilled in the art can understand that the specific size of the tank 1 can be adjusted according to actual needs, for example, in high temperature or strong corrosive environment, it is preferred to use higher strength glass fiber reinforced plastic material.

[0036] For easy maintenance and cleaning, the tank 1 is usually designed with an access hole or a removable cover plate at the top, and auxiliary devices such as a liquid level meter, a pressure gauge and a visual observation window can be installed on the outside of the tank as needed to facilitate real-time monitoring of the internal water level, pressure and water quality. According to the different daily or periodic treatment capacity, the tank 1 can be designed to have a capacity of several tons to several tens of tons to meet the needs of different scales of municipal sewage treatment or industrial wastewater treatment. Obviously, this design can significantly improve the applicability and flexibility of the device.

[0037] The inside of the tank 1 is divided into three functional areas, i.e., a water inlet sedimentation chamber 4, a first aeration chamber 5 and a second aeration chamber 6, by setting a first partition 2 and a second partition 3. Specifically, only a certain gap is left between the first partition 2 and the inner wall of the tank 1 at the upper end, and a certain distance is also left between the second partition 3 and the inner wall of the tank 1 at the upper end, so that the three areas are communicated at the top end in the tank 1. The height of the above-mentioned gap can be set according to the water treatment process requirements, and the upper end gap is usually controlled in the range of 5 cm to 30 cm, which not only facilitates sludge discharge, but also enables the water flow to circulate moderately at the bottom. It can be understood that the design of the above-mentioned gap is not limited to a specific size, but can also be adjusted according to the actual working conditions.

[0038] In order to enhance the rigidity of the tank 1 as a whole and avoid deformation or loosening of the partition in long-term operation, a sealing and fixing method is usually used at the connection between the partition and the inner wall of the tank 1; reinforcing ribs or supports can be provided in some areas to ensure the strength of the device and stabilize the internal water flow pattern.

[0039] In an alternative, the connection between the partition and the tank 1 can also be fixed by bolts or adhesion to adapt to different installation requirements.

[0040] The water inlet sedimentation chamber 4 is located on one side of the tank body, so as to quickly access the external sewage pipeline to be treated. A tee pipe 9 is installed on the top of the water inlet sedimentation chamber 4, close to the upper edge of the tank body 1. The tee pipe 9 is connected to the external pipeline through flange or threaded connection, one end is connected to the sewage to be treated, one end is connected to the flocculating agent liquid conveying pipeline, and the third end extends into the tank body 1. In order to ensure the sufficient mixing of sewage and flocculating agent in the early stage, the inner diameter of the tee pipe 9 can be set according to the actual flow, which is usually in the range of DN40 to DN80, and a metering pump or flow control valve can be matched outside to accurately adjust the injection amount of the flocculating agent liquid. Obviously, the design can effectively realize the uniform mixing of sewage and flocculating agent.

[0041] The inside of the water inlet sedimentation chamber 4 is divided into an upper area 21 and a lower area 22 by a partition plate. The upper area 21 and the lower area 22 are separated. The upper area 21 is provided with an upper grid plate 10 and a lower grid plate 11, both of which are made of glass fiber reinforced plastic. The upper grid plate 10 has a mesh size of several millimeters to several centimeters, which is used to trap solid impurities with large volume. The lower grid plate 11 has a mesh size of several hundred microns to several millimeters, which is used to finely filter the water flow and block relatively small suspended solids or debris. The lower area 22 is provided with a inclined pipe assembly 12. The upper area 21 is inserted into the lower area 22 through a vertical pipe 17, and the bottom end of the pipe 17 is lower than the inclined pipe assembly 12. The inclined pipe assembly 12 can be composed of several tubular or plate-shaped units with an inclination angle of 30° to 60°. The material is glass fiber reinforced plastic, and the unit diameter or plate spacing is determined according to the flow and impurity characteristics. The inclined pipe assembly 12 can significantly increase the contact area and prolong the contact time of sewage and flocculating agent, which is beneficial to the collision and coalescence of flocculating agent and suspended solids, forming large particle flocs. It can be understood that the design of the inclined pipe assembly 12 is not limited to a specific inclination angle or material, and can be adjusted according to actual needs.

[0042] In the bottom area of the first aeration chamber 5 and the second aeration chamber 6, one or more grates 13 are arranged respectively, which are used to limit the upward reflux of sludge in the bottom sedimentation area. The grate 13 is usually designed to be detachable or maintenance type, made of glass fiber reinforced plastic, and the opening rate and hole size are set according to the sludge deposition characteristics, usually in the range of several millimeters to several centimeters, which can prevent large sludge from drifting and ensure the mutual connection of water flow at the bottom. In an optional scheme, the opening rate of the grate 13 can be dynamically adjusted according to the sludge concentration and fluidity to adapt to different treatment needs.

[0043] In this embodiment, the first and second water collecting tanks 14 and 15 are installed on the top of the tank body 1 to realize the continuous and step-by-step water feeding from the water inlet sedimentation chamber 4 to the first aeration chamber 5 and then to the second aeration chamber 6. Specifically, the upper end of the first partition plate 2 is designed to be higher than the upper end of the second partition plate 3 by tens of centimeters to several tens of centimeters, so that when the mixed and preliminarily flocculated sewage reaches a certain water level in the water inlet sedimentation chamber 4, it will naturally overflow into the first aeration chamber 5 through the first water collecting tank 14; after the separation of sludge and water is completed in the first aeration chamber 5, the clear water continues to overflow into the second aeration chamber 6 through the second water collecting tank 15, thereby completing the segmented treatment process by relying on gravity. The second aeration chamber 6 is provided with a backwater pipe 18 near the upper edge of the tank body, which is generally connected with external clear water collecting equipment or drainage system through a flange interface, and a flow meter, an electric valve or a water quality online monitor can be additionally installed to realize automatic or semi-automatic water discharge control. It is obvious that this design can effectively realize the continuous treatment and stable discharge of water flow.

[0044] A plurality of sludge discharge pipes 7 are arranged at the central or eccentric position of the bottom of the tank body 1 according to the internal space layout, and the diameter of the sludge discharge pipes 7 is usually between DN50 and DN100, so that the sludge can be smoothly discharged even when the sludge concentration is high. The outlet of the sludge discharge pipe 7 can be connected to an external sludge thickening tank, a dewatering machine or other sludge disposal system. At least one set of aeration assembly is arranged above the sludge discharge pipe 7, mainly including an air inlet pipe 19 connected with an external air supply system such as a fan or a compressor, a distribution pipe 20 and a plurality of aeration pipes 8. The external air supply pipe can be fixed on the wall of the tank body 1 by flange or thread, and after being introduced into the tank body 1, the airflow is evenly distributed to each aeration pipe 8 by the distribution pipe 20. The length of each aeration pipe 8 can be determined according to the structure of the tank body 1, and it is usually arranged transversely along the tank body 1 and a plurality of inclined downward air outlets 16 with a diameter of 1-3 mm are uniformly arranged on the pipe wall. During operation, the airflow forms fine bubbles upward through the air outlets 16 and diffuses in the water to form a water flow circulation from bottom to top. Aeration stirring plays an auxiliary role in flocculation reaction and sedimentation effect, which can not only strengthen the molecular collision between sewage and flocculating agent to improve the flocculation efficiency, but also maintain sufficient water flow to avoid local sludge accumulation or channel blockage, without causing strong flow like mechanical stirring which can cause tank wear or excessive sludge stirring. By setting a valve or a flow meter, the aeration amount can be adjusted within a certain range to match the aeration intensity with the actual water quality demand. It can be understood that the design of the aeration assembly is not limited to a specific form, and different aeration modes can also be selected according to actual needs.

[0045] The operation process of the device is generally as follows: before starting the device, the required water treatment amount is determined, and the external pipeline, valve and flocculating agent metering device are adjusted. When the treated sewage enters the water inlet sedimentation chamber 4 from the three-way pipe 9, the flocculating agent also enters through the other end of the three-way pipe 9 at a set flow rate, so that the sewage and the sewage are rapidly mixed in the water inlet and the water inlet sedimentation chamber 4. At this time, the upper grid plate 10 traps large particle impurities, and the lower grid plate 11 further filters smaller suspended solids. The inclined unit in the inclined pipe assembly 12 provides more collision and coalescence space for the flocculation reaction, and forms larger flocs. Then the water level gradually rises, and most of the flocs and other impurities are settled to the bottom of the tank 1 under the action of gravity through the overflow of the first water collecting tank 14 to the first aeration chamber 5. By setting the grid plate 13 at the bottom of the first aeration chamber 5, most of the sludge can be controlled at the bottom of the tank 1 and the backflow is reduced. The clarified upper water then naturally enters the second aeration chamber 6 through the second water collecting tank 15. The clear water in the second aeration chamber 6 is finally discharged from the device by the backwater pipe 18, which can be directly discharged or entered into the subsequent process. During the whole process, the aeration assembly can operate in intermittent or continuous mode, on the one hand, the water in the tank is gently stirred to promote the reaction, on the other hand, to prevent the large sludge at the bottom from being deposited for too long and solidified or clogging the pipeline. It is obvious that the operation process can effectively realize the high-efficiency water treatment effect.

[0046] The sludge discharge process can be flexibly determined according to the on-site water quality, influent concentration and sedimentation chamber sludge layer thickness. Generally, in the treatment of municipal sewage or industrial wastewater with high suspended solids concentration, sludge discharge is performed once a day or every few days; when discharging sludge, the sludge deposited at the bottom is discharged to a sludge concentration tank or other subsequent treatment system by opening the sludge discharge pipe 7 valve. If the sludge load is low in actual working condition, the sludge discharge period can also be extended to save operation frequency. In order to ensure the long-term stable operation of the device, the grid plate 13, inclined pipe assembly 12 and aeration pipe 8 can also be regularly maintained or replaced during daily maintenance to check whether there is blockage, wear or corrosion, and if necessary, internal cleaning is performed through the maintenance hole at the top of the tank 1. It can be understood that the sludge discharge frequency and maintenance method can be adjusted according to actual needs.

[0047] The device uses the organic combination of inclined tube flocculation, sedimentation and aeration stirring, and integrated design can complete flocculation, sedimentation and clean water discharge and other functions in the same tank, greatly saving the land space and pipeline configuration cost. Through the optimization of hydraulic flow state and structure configuration, the sewage completes interception, flocculation and sedimentation in different areas in turn, and the effluent quality is stable. The use of aeration technology can realize mild and efficient stirring under the premise of low energy consumption, improve flocculation efficiency and delay sludge accumulation, avoiding the internal component wear and tear and high energy consumption caused by traditional mechanical stirring. For municipal sewage with high concentration of suspended solids or industrial wastewater containing a large amount of particles, the device can significantly improve the treatment efficiency and ensure a long period of continuous operation without failure; in the chemical, printing and dyeing and other industries that need to add reagents, the device realizes fine control through adjustable flocculating agent dosage and aeration amount, reduces reagent waste and reduces operating costs. In summary, the present application has obvious advantages in compactness, treatment efficiency, maintenance simplicity and operating cost, and is suitable for various water treatment occasions, and has good industrial application value and broad market prospect.

[0048] While exemplary embodiments of the present disclosure have been described, it will be understood by those skilled in the art that various changes and modifications can be made to the exemplary embodiments of the present disclosure without departing from the spirit and scope of the present disclosure in its essence. Therefore, all changes and modifications are included in the scope of protection of the present disclosure defined by the claims. The present disclosure is defined by the appended claims, and equivalents of these claims are also included.

Claims

1. An integrated water treatment device with aeration and stirring, characterized in that, The application relates to a sewage treatment tank, which comprises a tank body, wherein the tank body is internally partitioned into a water inlet sedimentation chamber, a first aeration chamber and a second aeration chamber. The bottom of the water inlet sedimentation chamber, the first aeration chamber and the second aeration chamber are communicated with each other, and the top of the water inlet sedimentation chamber, the first aeration chamber and the second aeration chamber is realized step-by-step water feeding through a first water collecting groove and a second water collecting groove. The water inlet sedimentation chamber is divided into an upper area and a lower area through a partition plate, the upper area is provided with upper and lower grid plates, and the lower area is provided with an inclined pipe assembly. A three-way pipe is arranged at a position close to the upper edge of the upper area of the water inlet sedimentation chamber, one end of the three-way pipe is used for connecting the sewage to be treated, the other end is used for adding flocculation liquid, and the third end is used for feeding the mixed sewage and liquid into the water inlet sedimentation chamber. The bottom of the first aeration chamber and the second aeration chamber is provided with a grid plate, the first water collecting groove and the second water collecting groove are provided with auxiliary pipelines, the water outlet of the auxiliary pipeline is lower than the grid plate, and the auxiliary pipeline is used for feeding water into the first aeration chamber and the second aeration chamber from the bottom. The first aeration chamber and the second aeration chamber are provided with an aeration assembly close to the bottom area, the aeration assembly comprises at least one aeration pipe and an air inlet pipe connected with an external air inlet device or device. The second aeration chamber is provided with a backwater pipe close to the upper edge position, which is used for discharging the treated clean water. The top of the water inlet sedimentation chamber and the first aeration chamber is communicated through the first water collecting groove, and the first aeration chamber and the second aeration chamber are communicated through the second water collecting groove. The water inlet sedimentation chamber, the first aeration chamber and the second aeration chamber are formed through a first partition plate and a second partition plate arranged in the tank body.

2. The integrated water treatment device according to claim 1, wherein The upper area is inserted into the lower area through a vertical pipeline, and the water outlet of the pipeline is lower than the inclined pipe assembly.

3. The integrated water treatment device according to claim 1, wherein The aeration pipe is provided with an inclined downward air outlet hole.

4. The integrated water treatment device according to claim 1, wherein The height of the first water collecting groove is higher than that of the second water collecting groove.

5. The integrated water treatment device according to claim 1, wherein The first partition plate cooperates with the tank body to form the water inlet sedimentation chamber, the first partition plate cooperates with the second partition plate to form the first aeration chamber, and the second partition plate cooperates with the tank body to form the second aeration chamber.

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