Moving bed bio-membrane reactor with internal circulation function and preparation method thereof

Abstract

The invention discloses a moving bed bio-membrane reactor with an internal circulation function, and relates to the technical field of sewage treatment.The moving bed bio-membrane reactor comprises a center cylinder connected to a water inlet pipe, and inlet water enters the reactor through the center cylinder; the biological bed layer is divided into six blocks by six rectangular partition plates, the edges of the partition plates are welded to the center cylinder, and the partition plates are filled with biological filler; the aeration pipe is located at the bottom of the reactor and connected with an aeration head, and the aeration head is a micropore aerator and is arranged in an annular shape; the water distribution caps are mounted on the water distribution holes in the bottom annular steel plate and are used for uniformly distributing water flow; the top screen is connected to the top of the central cylinder, and the aperture of the screen is smaller than the particle diameter of the biological filler to prevent loss of the biological filler; the effluent weir is used for discharging the treated sewage out of the reactor and discharging the treated sewage through a water outlet pipe; the sludge discharge pipe is mounted on the outer side of the reactor and higher than the partition plate and is used for discharging residual sludge; the blow-down pipe is positioned at the bottom of the outer side of the reactor and is lower than the aeration pipe and is used for discharging sewage.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to a moving bed biofilm reactor with an internal circulation function. Background Art

[0002] Moving Bed Biofilm Reactor (MBBR) is a new type of efficient sewage treatment process that combines the advantages of traditional activated sludge method and biological contact oxidation method. This technology was first applied in Europe in the 1980s and gradually developed into a widely used sewage treatment method. MBBR technology adds suspended fillers with a density close to that of water in the aeration tank. These fillers serve as active carriers of microorganisms and can maintain a suspended fluidized state by aeration and water flow. Microorganisms attach to these fillers and move freely in the reactor with the turnover of the mixed liquid, thereby effectively treating sewage.

[0003] Compared with traditional sewage biological treatment processes, MBBR technology has significant advantages in treatment effect, operation management, and floor space. Traditional processes often require a large floor space and are less efficient when treating high-load sewage. MBBR technology significantly improves treatment capacity by increasing the contact efficiency between microorganisms and sewage, while reducing the floor space required for facilities. In addition, the operation and management of the MBBR system is relatively simple, can better adapt to fluctuations in water quality and quantity, and has strong shock resistance.

[0004] However, the existing MBBR technology also has some shortcomings. For example, due to the suspended flow state of the filler, the uniform distribution of the filler and the internal circulation effect of the sewage are difficult to ensure, which may lead to low local treatment efficiency. In addition, under high load conditions, wear problems between fillers and sludge deposition problems will also affect the long-term stable operation of the system. Therefore, how to improve MBBR technology to further optimize the water circulation, filler distribution and sludge discharge inside the reactor has become the focus of current technical research.

[0005] In view of this, this application is hereby filed. Summary of the invention

[0006] The object of the present invention is to provide a moving bed biofilm reactor with internal circulation function and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the present invention provides a moving bed biofilm reactor with internal circulation function, which includes: the reactor includes: a central tube, which is connected to the water inlet pipe, and the water enters the reactor through the central tube; a biological bed layer, which is divided into six blocks by six rectangular partitions, the edges of the partitions are welded to the central tube, and the inside of the partitions is filled with biological fillers; an aeration pipe, located at the bottom of the reactor and connected to the aeration head, the aeration head is a microporous aerator, arranged in a ring shape; a water distribution cap, installed on the water distribution holes on the bottom annular steel plate, for uniformly distributing water flow; a top screen, connected to the top of the central tube, the screen aperture is smaller than the particle diameter of the biological filler to prevent the loss of the biological filler; an outlet weir, used to discharge the treated sewage out of the reactor and discharge it through the outlet pipe; a sludge discharge pipe, installed at a position higher than the partition on the outside of the reactor, for discharging residual sludge; a vent pipe, located at a position lower than the aeration pipe at the bottom of the outside of the reactor, for discharging sewage.

[0008] In a possible implementation, the six rectangular partitions are arranged at equal angles, and the angle between each partition is 60°, forming a symmetrical biobed block.

[0009] In a possible implementation manner, a reflux hole is opened at the bottom of the central tube, and the reflux hole corresponds to each partition plate to ensure uniform water replenishment.

[0010] In a possible implementation, the biological bed layer is an embedded structure, which is installed on a support plate on the side wall of the reactor to facilitate the fixation and replacement of the biological filler.

[0011] In a possible implementation, the aeration head introduces air through a main pipe to form a microporous aerator structure arranged in an annular shape to ensure that air and water are fully mixed.

[0012] In a possible implementation manner, the top height of the central tube is higher than the height of the partition plate to ensure uniform distribution and effective circulation of the biological filler in the mixed liquid.

[0013] In a possible implementation, the positions and numbers of the water distribution holes formed in the bottom annular steel plate are designed to optimize the distribution and flow of sewage in the reactor.

[0014] In a possible implementation, the reactor adopts an internal circulation design so that the sewage forms an internal circulation flow in the biological bed layer, thereby improving the biological treatment efficiency and the impact resistance of the reactor.

[0015] In a possible embodiment, the water circulation performed by the reactor through the central tube can evenly distribute the biological filler and enhance the mass transfer of pollutants between the water phase and the biological phase.

[0016] In a possible implementation, the sludge discharge pipe of the reactor is designed above the partition plate, which can effectively discharge the excess sludge and avoid the accumulation of sludge in the reactor.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] A moving bed biofilm reactor with internal circulation function in the present application realizes efficient sewage treatment and effective circulation flow of biological fillers inside the reactor through the precise design of the central tube, baffles, aeration system and water distribution system, thereby solving the problem of easy clogging and low efficiency of biofilm reactors during sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a cross-sectional schematic diagram of the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the present invention.

[0022] In the figure: 1. Center tube; 2. Partition; 3. Aeration tube; 4. Water distribution cap; 5. Top screen; 6. Water outlet weir; 7. Mud discharge pipe; 8. Vent pipe; 9. Backflow hole; 10. Support plate; 11. Aeration head. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0024] The present invention provides a technical solution: a moving bed biofilm reactor with an internal circulation function, the moving bed biofilm reactor with an internal circulation function comprises the following components: a central tube 1, the central tube 1 is connected to a water inlet pipe, and the water enters the reactor through the central tube 1; a biological bed layer, the biological bed layer is divided into six blocks by six rectangular partitions 2, the edges of the partitions 2 are welded to the central tube 1, and the interior of the partitions 2 is filled with biological fillers; an aeration pipe 3 located at the bottom of the reactor, the aeration pipe 3 is connected to an aeration head 11 of a microporous aerator, and the aeration head 11 is Ring-shaped arrangement; water distribution cap 4 is installed on the water distribution hole on the bottom annular steel plate to evenly distribute the water flow; a screen 5 connected to the top of the central tube 1, the screen aperture is smaller than the particle diameter of the biological filler to prevent the loss of the biological filler; the water distribution cap 4 is located above the support plate 10, a water outlet weir 6 is used to discharge the treated sewage and discharge it through the outlet pipe; a sludge discharge pipe 7, which is installed at a position higher than the partition 2 on the outside of the reactor to discharge the remaining sludge; a vent pipe 8 located at the bottom of the outside of the reactor below the position of the aeration pipe 3 is used to discharge sewage. Sewage enters the reactor through the central tube 1 and is treated in the biological bed. Air is introduced through the aeration pipe 3, and the annular structure of the microporous aerator can evenly distribute the air, so that the air and water are fully mixed, thereby promoting the contact between the organic matter in the sewage and the biofilm and improving the biodegradation efficiency. The biological bed is divided into six blocks by six rectangular partitions 2, and the biological filler in each block provides a large amount of biofilm attachment surface. The sewage flows in the biological bed, and the biofilm degrades the pollutants in the sewage. During the treatment process, the water distribution cap 4 at the bottom evenly distributes the water flow to ensure that the sewage in each block is evenly treated. The sewage treated by the biological bed is discharged from the reactor through the outlet weir 6, and the excess sludge is discharged through the sludge discharge pipe 7. The vent pipe 8 is used to discharge the sewage at the bottom of the reactor when necessary for maintenance and cleaning.

[0025] This application adopts an internal circulation design and an annular microporous aerator structure to enable sewage and air to be fully mixed in the reactor, thereby improving the degradation efficiency of pollutants. The design of the partition 2 ensures the uniform distribution of the biological filler, and realizes the uniform flow of sewage through the central tube 1, thereby enhancing the impact resistance of the reactor. The water distribution cap 4 at the bottom further optimizes the distribution of sewage in the reactor, ensuring the uniform treatment effect of the biological bed layer in each block. The design position of the sludge discharge pipe 7 can effectively prevent the accumulation of sludge in the reactor and ensure the long-term stable operation of the reactor.

[0026] Specifically, the six rectangular partitions 2 of the moving bed biofilm reactor with internal circulation function are arranged at equal angles, and the angle between each partition 2 is 60°, thereby forming a symmetrical bio-bed block. In this embodiment, the six rectangular partitions 2 are arranged at equal angles, so that the angle formed between every two adjacent partitions 2 is 60°. This symmetrical design helps to form a uniform flow field in the reactor, ensuring that the flow and distribution of sewage in each bio-bed block are consistent. Since each block has the same shape and size, sewage and air can be evenly mixed in each block, and the efficiency of biofilm treatment of sewage can be maximized. In addition, this symmetrical structure makes the internal circulation of the reactor more balanced, avoiding the problems of insufficient sewage treatment or uneven air distribution that may exist in certain areas.

[0027] The six baffles 2 arranged at equal angles form a symmetrical bio-bed block structure. This design improves the uniformity of flow in the reactor and optimizes the effect of sewage treatment. The symmetrical structure helps to reduce dead corners and sewage retention areas in the reactor, thereby improving the overall biodegradation efficiency. In addition, the equal-angle arrangement also simplifies the manufacturing process of the reactor, ensuring the stability of the structure and the convenience of maintenance.

[0028] In this embodiment, although an equal angle arrangement with an angle of 60° is adopted, in other applications, the number and arrangement angle of the partitions 2 can be adjusted according to the size of the reactor and the processing requirements. For example, in a larger-scale reactor, the number of partitions 2 can be increased, and the angle can be adjusted accordingly to maintain the symmetry and uniformity of the block. In addition, the shape of the partition 2 can also be changed from a rectangle to other polygons or arcs to adapt to different flow field requirements. The material of the partition 2 can also be selected from different corrosion-resistant materials or composite materials to increase the service life of the reactor.

[0029] As an excellent example, a reflow hole 9 is provided at the bottom of the central tube 1 of the moving bed biofilm reactor with an internal circulation function, and the reflow hole 9 corresponds to each partition 2 so as to evenly replenish water. Among them, the reflow holes 9 at the bottom of the central tube 1 are arranged corresponding to the partition 2, and each reflow hole 9 is evenly distributed around the central tube 1. These reflow holes 9 enable the mixed liquid inside the reactor to circulate between the various biological bed blocks, thereby achieving the effect of even water replenishment. After the sewage enters the reactor through the central tube 1, a part of it flows into each block through the reflow hole 9, replenishes the water in the block, and maintains the water balance of the biological bed layer. This design not only enhances the circulation of sewage, but also promotes the uniform distribution of biological fillers and the effective contact of biofilms, thereby improving the treatment efficiency of the reactor.

[0030] By opening a reflow hole 9 at the bottom of the central tube 1, sewage can be evenly added to each bio-bed block, ensuring that the biofilm in each block can get sufficient water supply, avoiding the decrease in treatment efficiency due to uneven water supply. In addition, this design also enhances the contact efficiency between sewage and biofilm, improves the degradation rate of pollutants and the overall performance of the reactor. The setting of the reflow hole 9 effectively supports the realization of internal circulation, making the water flow of the entire system more uniform and stable.

[0031] In this embodiment, the number and position of the reflux holes 9 can be adjusted according to actual needs. For example, the number of the reflux holes 9 can be increased or decreased to control the reflux speed and amount of the sewage. At the same time, the shape and size of the reflux holes 9 can also be optimized according to the specific design requirements of the reactor to adapt to different water qualities and treatment conditions. In addition, the position of the reflux holes 9 can be adjusted from the bottom of the central tube 1 to the side wall of the central tube 1 to adapt to different water flow designs and reactor structures, further optimizing the flow of sewage and the water replenishment effect.

[0032] As a preferred example, the biological bed layer of the moving bed biofilm reactor with internal circulation function is an embedded structure, which is installed on the support plate 10 of the side wall of the reactor to facilitate the fixation and replacement of the biological filler.

[0033] The embedded structural design of the biological bed layer enables the biological filler to be stably fixed in the reactor. The support plate 10 is installed on the side wall of the reactor, and the biological bed layer is embedded in the frame of the support plate 10, thereby forming a stable biological reaction block. This design ensures the effective fixation of the biological filler and prevents the filler from shifting or losing due to water flow impact during the reaction process. At the same time, the embedded structure also facilitates the replacement of the filler. When the filler needs to be replaced or maintained, it only needs to be removed from the support plate 10, which simplifies the operation process and saves maintenance time.

[0034] Specifically, the design of the embedded structure ensures the stability and fixation of the biological filler and improves the operating efficiency of the reactor. In addition, the installation of the support plate 10 makes the replacement of the biological filler more convenient, reducing maintenance costs and workload. This design not only extends the service life of the reactor, but also improves the attachment efficiency of the biofilm and the sewage treatment effect. The use of the embedded structure also helps to better control the thickness and density of the biological bed, thereby optimizing the biodegradation performance of the reactor.

[0035] The embedded structure of the biological bed can be adjusted according to the specific needs of the reactor. For example, the material of the support plate 10 can be selected from a material with higher corrosion resistance to meet the needs of different types of sewage treatment. The fixing method of the biological filler can also be changed from embedded to suspended or modular design so as to be flexibly adjusted under different operating conditions. At the same time, the size and shape of the embedded structure can be optimized according to the size of the reactor to ensure the optimal configuration of the filler and the uniform distribution of the biofilm.

[0036] Specifically, the aeration head 11 of the moving bed biofilm reactor with internal circulation function introduces air through a main pipe to form a microporous aerator structure arranged in an annular shape to ensure that air and water are fully mixed. Air is introduced into the reactor through the main pipe, and the main pipe distributes the air to the microporous aerator structure arranged in an annular shape. The annular aerator is located at the bottom of the reactor, and the air is evenly released into the sewage through the micropores, thereby forming fine bubbles. In the process of rising in the water, these bubbles fully contact with the pollutants in the sewage, promote the dissolution of oxygen, enhance the activity of microorganisms on the biofilm, and thus improve the biodegradation efficiency of the sewage. The annular aerator ensures uniform mixing of air and water in the entire reactor, avoiding treatment dead corners caused by uneven aeration.

[0037] The ring-shaped microporous aerator structure can achieve full mixing of air and water, improve the dissolved oxygen level in the reactor, and thus promote the efficiency of the biodegradation reaction. The ring-shaped arrangement makes the air evenly distributed, avoiding the phenomenon of gas concentration or sparseness, thereby improving the treatment effect of the entire reactor. In addition, the design of introducing air through the main pipe also simplifies the structure of the reactor, improves the reliability of the equipment and the stability of operation.

[0038] In this embodiment, the annular arrangement structure of the aeration head 11 can be adjusted according to the size and shape of the reactor. For example, the annular structure can be designed as multiple circles or spirals to meet different sewage treatment requirements. The aperture and layout of the microporous aerator can also be optimized according to the specific air-water mixing requirements to achieve the best oxygen utilization efficiency. In addition, the design of the main pipe can use different materials or add multiple branch pipes to improve the uniformity of air distribution and control flexibility.

[0039] As a preferred example, the top height of the central tube 1 of the moving bed biofilm reactor with internal circulation function is higher than the height of the partition 2 to ensure uniform distribution and effective circulation of the biological filler in the mixed liquid.

[0040] The top height of the central cylinder 1 is designed to be higher than the height of the baffle 2. This design can ensure the uniform distribution of the biological filler in the mixed liquid. Due to the increase in the height of the central cylinder 1, after the sewage enters the reactor from the central cylinder 1, a larger circulation flow area will be formed, which is conducive to the effective circulation of the biological filler in each block. Through this design, the biological filler will not accumulate in a specific area due to the limitation of the baffle 2, but will be evenly distributed in the entire biological bed. This not only optimizes the formation and growth of the biofilm, but also improves the contact efficiency between the sewage and the biofilm, thereby increasing the degradation rate of pollutants.

[0041] By increasing the height of the central tube 1, local accumulation of biological fillers can be effectively prevented, thereby ensuring their uniform distribution in the reactor. The evenly distributed biological fillers can contact the sewage more fully, enhance the treatment capacity of the biofilm, and ensure the sewage treatment efficiency in the reactor. In addition, this design also enhances the circulation flow of the system, which helps to improve the impact resistance and overall stability of the reactor.

[0042] In this embodiment, the height of the central tube 1 can be adjusted according to the actual needs of the reactor, for example, the height can be appropriately increased or decreased to adapt to different biological filler characteristics or sewage treatment requirements. The top shape of the central tube 1 can also be designed to be arc-shaped or conical to further optimize the flow of sewage and the circulation of filler. In addition, the height and position of the partition 2 can also be appropriately adjusted to match the design of the central tube 1, so as to achieve the best sewage treatment effect.

[0043] As a preferred example, the water distribution holes opened on the bottom annular steel plate of the moving bed biofilm reactor with internal circulation function are designed in position and quantity to optimize the distribution and flow of sewage in the reactor.

[0044] The design of the water distribution holes opened on the bottom annular steel plate has been precisely calculated to ensure that the sewage can be evenly distributed to each block of the reactor. The location and number of the water distribution holes are optimized according to the size of the reactor, the flow rate of sewage and the configuration of the biological bed layer to avoid uneven flow or dead corners of sewage in the reactor. After the sewage enters the bottom of the reactor through these water distribution holes, it flows upward in the biological bed layer to ensure that the sewage treatment in each block can achieve the best effect. This design not only improves the treatment efficiency of sewage, but also enhances the overall fluid dynamics performance of the reactor.

[0045] By optimizing the design of the water distribution holes, the sewage can be evenly distributed in the reactor, avoiding the problems of dead corners and insufficient local treatment. The uniform flow helps to improve the treatment efficiency of the biofilm, making the operation of the entire reactor more stable and efficient. In addition, this design can also reduce energy consumption, improve the treatment capacity of the reactor, and reduce maintenance and operating costs.

[0046] Specifically, the shape, number and location of the water distribution holes can be adjusted according to the specific reactor design. For example, different hole diameters and hole shapes can be selected according to the nature of the sewage, or the water distribution holes can be repositioned according to the size of the reactor and the layout of the biological bed. In addition, the arrangement of the water distribution holes can also be changed from a ring to other geometric shapes, such as radial or matrix arrangements, to adapt to different fluid mechanics requirements and treatment processes.

[0047] Specifically, the moving bed biofilm reactor with internal circulation function adopts an internal circulation design, so that the sewage forms an internal circulation flow in the biological bed layer, thereby improving the biological treatment efficiency and the impact resistance of the reactor.

[0048] The reactor realizes the internal circulation flow of sewage through structural design. After the sewage enters the reactor, it circulates continuously in the biological bed through the internal circulation flow mode under the guidance of the central tube 1 and the partition 2. This circulation flow increases the contact frequency between sewage and biofilm, allowing pollutants to be biodegraded more quickly. At the same time, the internal circulation setting reduces the unevenness of the sewage's residence time in the reactor. This flow pattern not only optimizes the treatment efficiency in the reactor, but also enhances the stability of the reactor under high load or shock load, and significantly improves the reactor's shock resistance.

[0049] Through the internal circulation design, the reactor can treat more sewage in a shorter time, significantly improving the efficiency of biological treatment. The internal circulation flow makes the contact between sewage and biofilm more frequent and uniform, thereby improving the removal rate of pollutants. At the same time, this design enhances the reactor's impact resistance, allowing the system to maintain stable operation when the load changes. In addition, the internal circulation design also reduces energy consumption and improves the overall efficiency of the system.

[0050] The implementation method of the internal circulation can be adjusted according to the specific needs of the reactor. For example, the flow path of the internal circulation can be optimized by adjusting the angle of the partition 2 or adding a guide plate. At the same time, the flow rate and direction of the internal circulation can also be adjusted according to different treatment process requirements to adapt to different sewage properties and treatment objectives. In addition, the size and shape of the reactor can be changed accordingly to achieve more efficient internal circulation flow and sewage treatment effect.

[0051] In a possible implementation, the moving bed biofilm reactor with an internal circulation function can evenly distribute the biological fillers and enhance the mass transfer of pollutants between the water phase and the biological phase through the water circulation performed by the central tube 1.

[0052] The central tube 1 of the reactor ensures the uniform distribution of the biological filler throughout the reactor by controlling the circulation path of the water flow. The water flows into the reactor through the central tube 1 and circulates between the baffles 2 along the biological bed. This circulating flow enhances the material transfer efficiency between the water phase and the biological phase, making it easier for pollutants to be adsorbed and degraded by the biofilm. Through the uniform distribution of water flow, the biological filler can be evenly distributed in each block, avoiding the accumulation and loss of filler, thereby improving the treatment efficiency and stability of the system. The design of water flow circulation can effectively and evenly distribute the biological filler to ensure consistent sewage treatment effects in each block. The uniform filler distribution and enhanced mass transfer efficiency significantly improve the removal rate of pollutants, thereby improving the treatment performance of the entire reactor. In addition, the water flow circulation also helps maintain the stable operation inside the reactor and reduces the flow resistance and efficiency reduction caused by filler accumulation.

[0053] The path and speed of the water circulation can be adjusted according to the specific design requirements of the reactor. For example, the distribution uniformity and circulation intensity of the water flow can be controlled by increasing or decreasing the number of reflow holes 9 in the central tube 1. In addition, the direction and flow rate of the water flow can also be optimized and adjusted according to different biological filler characteristics and treatment objectives to further enhance the mass transfer efficiency of pollutants. The shape and size of the central tube 1 can also be changed accordingly to adapt to different reactor structures and sewage treatment requirements.

[0054] The mud discharge pipe 7 of the moving bed biofilm reactor with internal circulation function is designed above the partition 2, which can effectively discharge the excess sludge and avoid the accumulation of sludge in the reactor. The mud discharge pipe 7 is designed above the partition 2 of the reactor. This position enables the system to more effectively discharge the excess sludge generated during the reaction. As the sludge accumulates in the reactor, the sludge will gradually rise above the partition 2. Through the mud discharge pipe 7 set at this position, the sludge can be quickly and effectively discharged from the reactor to prevent its accumulation inside the reactor. Such a design ensures the normal operation of the biological bed layer, avoids the problem of reactor blockage or reduced treatment efficiency due to sludge accumulation, and also helps to maintain the activity of the biofilm and the sewage treatment effect.

[0055] In this embodiment, by designing the sludge discharge pipe 7 above the partition 2, it is possible to effectively prevent the accumulation of sludge in the reactor, thereby maintaining the long-term stable operation of the system. This design helps to reduce the maintenance frequency and operating costs of the reactor and extend the service life of the equipment. In addition, timely removal of sludge also helps to maintain the health of the biofilm, ensuring that it efficiently degrades pollutants in sewage, and further improves the processing capacity and efficiency of the reactor.

[0056] In this embodiment, the position and number of the mud discharge pipe 7 can be adjusted according to the actual needs of the reactor. For example, multiple mud discharge pipes 7 can be set above each partition 2 to further improve the efficiency and flexibility of sludge discharge. In addition, the design of the mud discharge pipe 7 can adopt different materials or structures, such as using an anti-clogging design or an automatic mud discharge system to adapt to different types of sewage treatment needs and operating conditions. The position of the mud discharge pipe 7 can also be optimized and adjusted according to the characteristics of the sludge and the operating parameters of the reactor to ensure that the sludge can be discharged smoothly and maintain the efficient operation of the system.

[0057] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A moving bed biofilm reactor with internal circulation function, characterized in that: The reactor comprises: a central cylinder connected to a water inlet pipe, through which water enters the reactor; The biological bed layer is divided into six blocks by six rectangular partitions, the edges of the partitions are welded to the central tube, and the interior of the partitions is filled with biological fillers; The aeration pipe is located at the bottom of the reactor and is connected to the aeration head, which is a microporous aerator arranged in a ring shape; The water distribution cap is installed on the water distribution hole on the bottom annular steel plate to evenly distribute the water flow; The top screen is connected to the top of the central cylinder, and the screen aperture is smaller than the particle diameter of the biological filler to prevent the biological filler from being lost; An outlet weir is used to discharge the treated sewage out of the reactor and discharge it through an outlet pipe; The sludge discharge pipe is installed on the outside of the reactor at a position higher than the partition to discharge the remaining sludge; The vent pipe is located at the bottom of the outside of the reactor below the aeration pipe and is used to discharge sewage.

2. The moving bed biofilm reactor with internal circulation function according to claim 1, characterized in that: The six rectangular partitions are arranged at equal angles, and the angle between each partition is 60°, forming a symmetrical biobed block.

3. The moving bed biofilm reactor with internal circulation function according to claim 1, characterized in that: The bottom of the central tube is provided with a reflux hole, which corresponds to each partition plate so as to evenly replenish water.

4. The moving bed biofilm reactor with internal circulation function according to claim 1, characterized in that: The biological bed layer is an embedded structure and is installed on a support plate on the side wall of the reactor to facilitate the fixation and replacement of biological fillers.

5. The moving bed biofilm reactor with internal circulation function according to claim 1, characterized in that: The aeration head introduces air through a main pipe to form a microporous aerator structure arranged in an annular shape to ensure that air and water are fully mixed.

6. The moving bed biofilm reactor with internal circulation function according to claim 1, characterized in that: The top height of the central tube is higher than the height of the partition plate to ensure uniform distribution and effective circulation of the biological filler in the mixed liquid.

7. The moving bed biofilm reactor with internal circulation function according to claim 1, characterized in that: The positions and numbers of the water distribution holes formed in the bottom annular steel plate are designed to optimize the distribution and flow of sewage in the reactor.

8. The moving bed biofilm reactor with internal circulation function according to claim 1, characterized in that: The reactor adopts an internal circulation design, so that the sewage forms an internal circulation flow in the biological bed layer, thereby improving the biological treatment efficiency and the impact resistance of the reactor.

9. The moving bed biofilm reactor with internal circulation function according to claim 1, characterized in that: The reactor can evenly distribute the biological fillers and strengthen the mass transfer of pollutants between the water phase and the biological phase through the water flow circulation carried out by the central tube.

10. The moving bed biofilm reactor with internal circulation function according to claim 1, characterized in that: The sludge discharge pipe of the reactor is designed above the partition plate, which can effectively discharge the remaining sludge and avoid the accumulation of sludge in the reactor.

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