Membrane bioreactor type urban sewage denitrification and phosphorus removal regeneration device

Abstract

This invention relates to the field of wastewater treatment technology, specifically to a membrane bioreactor-type urban wastewater denitrification and phosphorus removal regeneration device. It includes a pretreatment tank, a reaction tank, and a clear water tank, and further comprises: several membrane modules, each having an inner ring membrane with staggered top and bottom hollow fiber membranes, which increases the contact area with wastewater within a limited height; and a flow guide plate placed around the membrane module to guide wastewater flow, conforming to the tilt direction of the hollow fiber membranes on the inner ring membrane at that position. This device, by staggering the top and bottom of the hollow fiber membranes of the inner and outer ring membranes, makes the membrane fibers spiral, significantly increasing the contact area between the membrane module and wastewater without increasing the overall height and diameter of the device, thus effectively improving the wastewater treatment speed.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a membrane bioreactor-type urban wastewater denitrification and phosphorus removal regeneration device. Background Technology

[0002] Membrane bioreactor (MBR) is a new type of water treatment equipment that combines membrane separation technology with biological treatment. It is mainly used in municipal sewage, industrial wastewater treatment and reclaimed water reuse. Its core is to replace the traditional secondary sedimentation tank with membrane modules, and achieve efficient separation of sludge and water through ultrafiltration / microfiltration technology. The sludge concentration in the bioreactor reaches 8000-12000 mg / L, which improves the treatment efficiency. The technology adopts a modular design, and technologies such as trough-type gas collection pulse aeration and gradient network membrane pore structure optimize the antifouling properties and energy consumption.

[0003] The membrane separation unit of the membrane bioreactor is the core of the system, consisting of membrane modules, membrane tanks and water collection system. It replaces the traditional secondary sedimentation tank to achieve sludge-water separation. It is equipped with aeration equipment to agitate the activated sludge and uses negative pressure for separation. Existing membrane modules usually have aeration equipment separately configured at the bottom and are arranged vertically, which limits the efficiency of wastewater treatment. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a membrane bioreactor-type urban wastewater denitrification and phosphorus removal regeneration device, which can effectively solve the problem of how to improve wastewater treatment efficiency in existing technologies.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a membrane bioreactor-type municipal wastewater denitrification and phosphorus removal regeneration device, comprising a pretreatment tank, a reaction tank, and a clear water tank, and further comprising: The membrane module, in several quantities, has an inner membrane with a staggered top and bottom distribution of hollow fiber membranes, which can increase the contact area with wastewater within a limited height. The flow guide plate is placed around the membrane module to guide the flow of wastewater and conforms to the tilt direction of the hollow fiber membrane on the inner membrane at that location.

[0006] Furthermore, the membrane module also includes a cylindrical membrane frame, in which an outer membrane is fixedly connected. A single inner membrane, an outer membrane, and a cylindrical membrane frame constitute a membrane module, and the hollow fiber membranes of the inner and outer membranes of the same membrane module are distributed in the same way. The hollow fiber membranes of adjacent inner and outer membranes are interlaced in opposite directions.

[0007] Furthermore, the reaction tank is equipped with an aeration system, including a disc aerator and a tubular aerator. The disc aerator is installed at the bottom of the reaction tank, and the tubular aerator is fixedly installed on the chassis of the cylindrical membrane frame, with the spiral direction being the same as the inclination direction of the inner membrane of the group, and located between the inner membrane and the outer membrane.

[0008] Furthermore, the inner diameter of the inner membrane has multiple vertical connecting rods connecting the top ring and the bottom ring, and the bottom ring of the inner membrane is fixed to the base of the cylindrical membrane frame. The top of the outer membrane is fixedly connected to the inner diameter of the top ring of the cylindrical membrane frame by bolts. The water collection pipes of both the inner and outer membranes are located at the top.

[0009] Furthermore, when adjacent outer membranes are installed, they are staggered by 1 / 4 to 1 / 2 of the pitch of the hollow fiber membrane, which can form staggered vortices between the two outer membranes and eliminate static dead angles between components and tube groups.

[0010] Furthermore, a two-position three-way solenoid valve is fixedly installed between the pretreatment tank and the reaction tank, and the two outlets of the two-position three-way solenoid valve in the reaction tank face opposite directions. It cooperates with the guide plate to form a matching water flow path on the outer side of the outer membrane, and the path can be changed by changing the outlet of the two-position three-way solenoid valve.

[0011] Furthermore, the flow guide plate includes an arc-shaped plate fixedly installed at the bottom of the reaction tank, and one end of the arc-shaped plate is rotatably connected to a flow guide tail plate driven by a motor.

[0012] Furthermore, multiple buffer plates are rotatably connected to the arc-shaped plate, and a bidirectional electromagnet is fixedly connected to the center of the arc-shaped plate. Magnets that can be attracted by the bidirectional electromagnet are provided on the inner side of the buffer plates.

[0013] The technical solution provided by this invention has the following advantages compared with the known prior art: 1. This device achieves a spiral shape by staggering the top and bottom of the hollow fiber membranes of the inner and outer membranes, resulting in a spiral shape. Without increasing the overall height and diameter of the device, it significantly increases the contact area between the membrane module and the wastewater, effectively improving the wastewater treatment speed. Simultaneously, the tubular aerator located between the inner and outer membranes is arranged in the same spiral direction as the membrane fibers. This not only provides uniform oxygen to the microorganisms but also conforms to the spiral direction of the membrane fibers, assisting the surrounding wastewater to flow in the spiral direction. This further stabilizes the water flow near the membrane module. The combined action of airflow and water flow washes the membrane surface, effectively slowing down the rate of membrane clogging and extending the normal operating cycle of the membrane module.

[0014] 2. This device reduces turbulence caused by water flow impact in areas where adjacent membrane modules are close together by setting the hollow fiber membranes with opposite spiral directions. This reduces the adverse effects on aeration and activated sludge flow. At the same time, the opposite spiral directions cause the liquid flow generated by adjacent membrane modules during negative pressure suction to have a superposition effect in local areas, further improving the overall flow of wastewater and activated sludge. This not only prevents sludge impurities from rapidly depositing and polluting the membrane surface, but also increases the contact opportunities between activated sludge and aeration, enhancing the degradation effect of pollutants by microorganisms and improving the efficiency of nitrogen and phosphorus removal.

[0015] 3. This device, by installing a two-position three-way solenoid valve between the pretreatment tank and the reaction tank, in conjunction with the flow guide plate at the bottom of the reaction tank, can intermittently change the flow path of sewage after entering the reaction tank, so that the water flow sequentially covers different areas of the membrane module. This intermittent switching of the water flow path can effectively prevent the membrane module from being in a high-intensity working state for a long time and causing rapid fouling. It allows different areas of the membrane module to perform sewage treatment intermittently, balances the load of each part of the membrane module, further extends the cleaning cycle of the membrane module, reduces the frequency of chemical cleaning, and lowers operating costs.

[0016] 4. This device fixes the top of the outer membrane to the inner diameter of the top ring of the cylindrical membrane frame with bolts, so that the top ring of the cylindrical membrane frame is outside the top ring of the outer membrane. It does not obstruct the top of the inner and outer membranes. When the membrane module needs to be cleaned or replaced, simply remove the connecting bolts between the outer membrane and the cylindrical membrane frame and between the inner membrane and the cylindrical membrane frame. The inner and outer membranes can then be directly removed from the cylindrical membrane frame for backwashing or replacement. This simplifies the disassembly and assembly process of the membrane module and reduces the difficulty and labor intensity of maintenance.

[0017] 5. This device incorporates a rotatable buffer plate embedded in the arc-shaped plate of the guide plate, and a bidirectional electromagnet is installed inside the arc-shaped plate. When switching the outlet of the two-position three-way solenoid valve, the electromagnetic polarity of the bidirectional electromagnet is changed, converting the attraction force on the magnet on the buffer plate into a repulsive force, causing the buffer plate to open naturally, increasing the water-facing surface, effectively reducing the water flow velocity, avoiding strong impacts and noise caused by sudden changes in water flow direction, and preventing water hammer effect. This protects the device's pipelines and related components. The adjusted guide plate can better guide the water flow direction and enhance the liquid flow effect near the membrane module. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the reaction tank of the present invention; Figure 3 This is a schematic diagram of the membrane module separation according to the present invention; Figure 4 This is a schematic diagram of the inner membrane of the present invention; Figure 5 This is a schematic diagram of the outer membrane of the present invention; Figure 6 This is a schematic diagram of the aeration system in the reaction tank of the present invention; Figure 7 This is a half-sectional view of the flow guide plate of the present invention; Figure 8 This is a schematic diagram showing the rotation angle of the guide tail plate in the guide plate component of the present invention; Figure 9 This is a schematic diagram of the water flow trend in the reaction tank of the present invention.

[0020] The labels in the diagram represent: 1. Pretreatment tank; 2. Reaction tank; 3. Clear water tank; 4. Membrane module; 401. Inner membrane; 402. Outer membrane; 403. Cylindrical membrane frame; 5. Disc aerator; 6. Tubular aerator; 7. Two-position three-way solenoid valve; 8. Flow guide plate; 801. Arc plate; 802. Buffer plate; 803. Flow guide tail plate; 804. Bidirectional electromagnet. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] The present invention will be further described below with reference to embodiments.

[0023] Reference Figures 1 to 9Example: A membrane bioreactor type urban sewage denitrification and phosphorus removal regeneration device includes a pretreatment tank 1, a reaction tank 2 and a clear water tank 3, and a number of membrane modules 4, which have an inner ring membrane 401 with a staggered top and bottom of hollow fiber membrane, which can increase the contact area with sewage within a limited height.

[0024] Hollow fiber membranes are currently the most widely used type of MBR in engineering applications. The mainstream method is to use submerged external pressure hollow fiber membranes, replacing the secondary sedimentation tanks in traditional wastewater treatment with hollow fiber membrane modules, integrating biodegradation and membrane separation.

[0025] The core is divided into four parts: Reaction tank 2: stores sewage and activated sludge, relying on microorganisms to decompose pollutants such as organic matter and ammonia nitrogen in the water; Membrane module 4: the core filtration unit, with a large number of fine membrane fibers arranged into a membrane curtain, which is suspended and submerged in the mixed liquor in the tank, and the two ends of the membrane fibers are sealed to collect water; Aeration system: continuous aeration at the bottom, which not only provides oxygen for microorganisms, but also uses airflow disturbance to wash the membrane surface and reduce membrane clogging; Water production and cleaning system: clean water is drawn in by a negative pressure pump, and equipped with online backwashing and chemical cleaning devices to restore the membrane filtration capacity.

[0026] After the wastewater enters the reaction tank 2, the activated sludge first completes the degradation of pollutants; then, under the action of negative pressure suction, the clear water in the mixed liquor permeates from the outside of the membrane fibers into the hollow inner cavity, collects and is discharged; sludge, suspended solids, bacteria and other substances are trapped in the tank by the membrane fibers, achieving efficient mud-water separation, and no sedimentation process is required throughout the process.

[0027] During installation, the hollow fiber membranes of the inner ring membrane 401 and the outer ring membrane 402 are staggered at the top and bottom. That is, after the bottom ring of the inner ring membrane 401 and the outer ring membrane 402 is fixed, the top ring rotates at a certain angle. Since the hollow fiber membrane is flexible, the top ring rotates and forms a certain angle of intersection with the bottom ring, so the hollow fiber membrane will take on a near-spiral shape. In this way, under the same height conditions and without changing the diameter of the circle, the hollow fiber membranes of the inner ring membrane 401 and the outer ring membrane 402 have a larger contact area with the sewage, resulting in a faster sewage treatment speed.

[0028] Correspondingly, the membrane module 4 is drawn by negative pressure, thus forming a water flow around the membrane module 4 that is similar in shape and distribution. The guide plate 8 is set to help stabilize the direction of the water flow and reduce turbulence. The inner diameter of the inner membrane 401 has multiple vertical connecting rods that connect the top ring and the bottom ring. The bottom ring of the inner membrane 401 is fixed to the base of the cylindrical membrane frame 403. The top of the outer membrane 402 is fixed to the inner diameter of the top ring of the cylindrical membrane frame 403 by bolts. The water collection pipes of the inner membrane 401 and the outer membrane 402 are both set at the top.

[0029] Specifically, the membrane module 4 also includes a cylindrical membrane frame 403, with an outer membrane 402 fixedly connected inside the cylindrical membrane frame 403. Each inner membrane 401, outer membrane 402, and cylindrical membrane frame 403 constitute a membrane module 4, and the hollow fiber membranes of the inner membrane 401 and outer membrane 402 of the same membrane module have the same distribution pattern; the hollow fiber membranes of adjacent inner membranes 401 and outer membranes 402 have opposite interlacing directions.

[0030] The cylindrical membrane frame 403 must first be installed in the reaction tank 2. Then, the bottom ring of the inner membrane 401 is installed and fixed on the base of the cylindrical membrane frame 403. After the top ring of the inner membrane 401 is twisted at a certain angle, multiple connecting rods are used to vertically fix it at the inner diameter of the top and bottom rings of the inner membrane 401 to fix the top and bottom rings of the inner membrane 401. Next, the tubular aerator 6 is installed. The bottom of the tubular aerator 6 must be fixed on the base of the cylindrical membrane frame 403. The tubular aerator 6 is connected to the aeration pipeline. Then, the bottom ring of the outer membrane 402 is fixed on the base of the cylindrical membrane frame 403, with the rotation direction being the same as that of the top ring of the inner membrane 401. The top ring of the outer membrane 402 is rotated so that the spiral directions of the hollow fiber membranes of the inner membrane 401 and the outer membrane 402 are the same.

[0031] During disassembly, since the top ring of the tubular membrane holder 403 is located outside the top ring of the outer membrane 402, the tubular membrane holder 403 will not obstruct the view above the inner membrane 401 and the outer membrane 402. After removing the bolts between the outer membrane 402 and the tubular membrane holder 403, and the bolts between the inner membrane 401 and the tubular membrane holder 403, the inner membrane 401 and the outer membrane 402 can be directly removed for backwashing or replacement.

[0032] Specifically, the reaction tank 2 is equipped with an aeration system, including a disc aerator 5 and a tubular aerator 6. The disc aerator 5 is installed at the bottom of the reaction tank 2, and the tubular aerator 6 is fixedly installed on the chassis of the cylindrical membrane frame 403. The spiral direction is the same as the inclination direction of the inner membrane 401 in this group, and it is located between the inner membrane 401 and the outer membrane 402. The tubular aerator 6 is located between the inner membrane 401 and the outer membrane 402, and it needs to be in the same spiral direction as the hollow fiber membranes of the inner membrane 401 and the outer membrane 402. It can perform aeration for both membranes, and the spiral direction of the tubular aerator 6 can also help the surrounding sewage flow in the spiral direction, thus helping to stabilize the flow of sewage.

[0033] Water drawn in by the inner membrane 401 and outer membrane 402 under negative pressure will enter the clear water tank 3, while sludge and other impurities will be isolated outside the inner membrane 401 and outer membrane 402 and will not enter the clear water tank 3. After a certain period of use, the inner membrane 401 and outer membrane 402 should be cleaned to ensure the separation function of the inner membrane 401 and outer membrane 402. The integrity of the membranes on the inner membrane 401 and outer membrane 402 should not be damaged during cleaning.

[0034] Furthermore, the adjacent outer membranes 402 are staggered by 1 / 4 to 1 / 2 of the pitch of the hollow fiber membrane during installation. During installation, the spirals are staggered in a rotating manner, which can form interlaced vortices between the two outer membranes 402, eliminating static dead angles between components and tube groups.

[0035] After one set of membrane modules 4 is installed, attention should be paid to the fact that the spiral direction of the inner membrane 401 and the outer membrane 402 in the other set of membrane modules 4 should be opposite to that of the adjacent outer membrane 402. This reduces the turbulence formed by the water flow impacting each other in the area close to each other, and reduces the impact on aeration and the flowability of activated sludge. Furthermore, if the spiral directions are opposite, the liquid flow formed by the adjacent outer membrane 402 and inner membrane 401 during the suction process will overlap in a local area, which can improve the flowability of sewage and activated sludge to a certain extent. This can not only avoid the rapid fouling of the membrane by sludge impurities, but also increase the contact between activated sludge and aeration.

[0036] Specifically, a two-position three-way solenoid valve 7 is fixedly installed between the pretreatment tank 1 and the reaction tank 2. The two outlets of the two-position three-way solenoid valve 7 are facing opposite directions and cooperate with the guide plate 8 to form a matching water flow path on the outside of the outer membrane 402. The path can be changed by changing the outlet of the two-position three-way solenoid valve 7. The guide plate 8 includes an arc-shaped plate 801 fixedly installed at the bottom of the reaction tank 2. One end of the arc-shaped plate 801 is rotatably connected to a motor-driven guide tail plate 803.

[0037] After treatment, the wastewater in pretreatment tank 1 enters reaction tank 2 through a two-position three-way solenoid valve 7. Only one of the two outlets of the two-position three-way solenoid valve 7 is opened at a time. Figure 9 The arrow, with an inner diameter of approximately 3 / 4 of a circle, indicates the flow trend of the liquid near membrane module 4, while the black line path represents the flow path of wastewater exiting from the 2-position 3-way solenoid valve 7 after being guided by the guide plate 8. Figure 9 The left side of the image shows the starting position of the water flow path, marked by a black arrow. The upper and lower parts represent the different sewage flow paths after the two-position three-way solenoid valve 7 is opened at different outlets. When a single outlet of the two-position three-way solenoid valve 7 is open, the sewage flow path can be roughly considered to cover half of the area of ​​each membrane module 4. Combined with the existing technology of automatic control that stops water flow after a period of time, the outlet of the two-position three-way solenoid valve 7 is changed after the water inlet stops. That is, after water flow for a period of time, the water is stopped, the water flow path is changed, and then water is flowed again. This can effectively guide the water flow and enhance the flow effect. The intermittent change of the water flow path can avoid local rapid fouling of the membrane module 4, allowing different areas of the membrane module 4 to perform sewage treatment intermittently.

[0038] The position of the guide tailplate 803 should be as follows: Figure 8 As shown, the guide tail plate 803 should be oriented towards the water flow path. When passing through this path, the guide tail plate 803 on this path should be at a certain angle to the arc plate 801 under the drive of the motor, forming a distribution where the guide tail plate 803 is slightly open relative to the arc plate 801. This is to allow the water to flow out of the guide tail plate 803 and into the arc plate 801 at a better angle, so that the water flow can be better guided by the arc plate 801. It is also to guide the direction of the water flow out of the guide tail plate 803, and to guide the water flow as much as possible within the area covered by the arc plate 801 and the guide tail plate 803, thereby strengthening the liquid flow near the inner membrane 401 and the outer membrane 402.

[0039] Furthermore, multiple buffer plates 802 are rotatably connected to the arc plate 801, and a bidirectional electromagnet 804 is fixedly connected to the center of the arc plate 801. Magnets that can be attracted by the bidirectional electromagnet 804 are provided on the inner side of the buffer plate 802.

[0040] When replacing the outlet of the two-position three-way solenoid valve 7, to avoid noise caused by water flow impact or even water hammer effect, the electromagnetic polarity of the bidirectional electromagnet 804 inside the arc-shaped plate 801 used to guide the liquid flow should be changed. This changes the attraction force on the magnet on the buffer plate 802 to a repulsive force. After losing the magnetic attraction of the bidirectional electromagnet 804 to the buffer plate 802, the buffer plate 802 naturally opens, and the liquid flow impacts the outer side of the buffer plate 802, thereby increasing the water-facing surface and reducing the water flow velocity. After this, the guide plate 803 on the arc-shaped plate 801 is adjusted by rotating it inwards at a certain angle to make room for the other guide plates 803 to rotate outwards. The magnet on the buffer plate 802 is located on the inner side and within the magnetic force range of the bidirectional electromagnet 804. The inward rotation of the guide plate 803... Figure 8 It is also on display in China.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A membrane bioreactor-type municipal wastewater denitrification and phosphorus removal regeneration device, comprising a pretreatment tank (1), a reaction tank (2), and a clear water tank (3), characterized in that, Also includes: Several membrane modules (4) have inner membranes (401) with staggered top and bottom distribution of hollow fiber membranes, which can increase the contact area with sewage within a limited height. The membrane module (4) also includes a cylindrical membrane frame (403), in which an outer membrane (402) is fixedly connected. Each inner membrane (401), outer membrane (402) and cylindrical membrane frame (403) constitute a membrane module (4), and the inner membrane (401) and outer membrane of the same membrane module are also connected. The hollow fiber membranes of (402) are distributed in the same way; the hollow fiber membranes of adjacent inner ring membranes (401) and outer ring membranes (402) are staggered in opposite directions; during installation, the top and bottom of the hollow fiber membranes of the inner ring membrane (401) and outer ring membrane (402) are staggered. After the bottom ring of the inner ring membrane (401) and outer ring membrane (402) is fixed, its top ring rotates at a certain angle and forms a certain angle of stagger with the bottom ring, and the hollow fiber membrane will present a shape close to a spiral. The flow guide plate (8) is placed around the membrane module (4) to guide the flow of sewage and conforms to the tilt direction of the hollow fiber membrane on the inner membrane (401) at that position.

2. The membrane bioreactor-type urban wastewater denitrification and phosphorus removal regeneration device according to claim 1, characterized in that, The reaction tank (2) is equipped with an aeration system, including a disc aerator (5) and a tubular aerator (6). The disc aerator (5) is installed at the bottom of the reaction tank (2), and the tubular aerator (6) is fixedly installed on the chassis of the cylindrical membrane frame (403), and the spiral direction is the same as the inclination direction of the inner membrane (401) of the group, and is located between the inner membrane (401) and the outer membrane (402).

3. The membrane bioreactor-type urban wastewater denitrification and phosphorus removal regeneration device according to claim 2, characterized in that, The inner diameter of the inner membrane (401) has multiple vertical connecting rods that connect the top ring and the bottom ring, and the bottom ring of the inner membrane (401) is fixed on the base of the cylindrical membrane frame (403). The top of the outer membrane (402) is fixedly connected to the inner diameter of the top ring of the cylindrical membrane frame (403) by bolts. The water collection pipes of the inner membrane (401) and the outer membrane (402) are both set at the top.

4. The membrane bioreactor-type urban wastewater denitrification and phosphorus removal regeneration device according to claim 2, characterized in that, When the adjacent outer membranes (402) are installed, they are staggered by 1 / 4 to 1 / 2 pitch of the hollow fiber membrane, which can form staggered vortices between the two outer membranes (402) and eliminate static dead angles between components and tube groups.

5. The membrane bioreactor-type urban wastewater denitrification and phosphorus removal regeneration device according to claim 1, characterized in that, A two-position three-way solenoid valve (7) is fixedly installed between the pretreatment tank (1) and the reaction tank (2). The two outlets of the two-position three-way solenoid valve (7) are facing opposite directions and cooperate with the guide plate (8) to form a matching water flow path on the outside of the outer membrane (402). Changing the outlet of the two-position three-way solenoid valve (7) changes the path.

6. A membrane bioreactor-type urban wastewater denitrification and phosphorus removal regeneration device according to claim 5, characterized in that, The flow guide plate (8) includes an arc-shaped plate (801) fixedly installed at the bottom of the reaction tank (2), and one end of the arc-shaped plate (801) is rotatably connected to a motor-driven flow guide tail plate (803).

7. A membrane bioreactor-type urban wastewater denitrification and phosphorus removal regeneration device according to claim 6, characterized in that, Multiple buffer plates (802) are rotatably connected to the arc plate (801). A bidirectional electromagnet (804) is fixedly connected to the center of the arc plate (801). Magnets that can be attracted by the bidirectional electromagnet (804) are provided on the inner side of the buffer plate (802).

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