Membrane biological reaction sewage treatment device with sludge recovery reduction structure

Abstract

The application discloses a membrane biological reaction sewage treatment device with sludge recovery and reduction structure and relates to the technical field of membrane biological reaction sewage treatment.The device comprises a treatment pool body, a membrane reaction group arranged on the right side in the treatment pool body, a separation mechanism arranged on the left side in the treatment pool body, a separation partition plate, a separation sieve plate fixedly arranged on the left side in the middle of the separation partition plate, a flow transverse groove arranged in the lower end of the separation partition plate, and a precipitation mechanism arranged on the middle of the treatment pool body.The left side area of the treatment pool body is isolated by the separation partition plate, the flow transverse groove is arranged in the lower end of the separation partition plate, and the precipitation mechanism is arranged on the middle of the treatment pool body.The membrane biological reaction sewage treatment device with sludge recovery and reduction structure can separate the water-containing sludge by the treatment pool body, reduce the load of the treatment pool body, and uniformly distribute the medicament by the middle spreading filter box, so that the sewage is efficiently treated by overflowing into the membrane reaction group, and the efficiency of environmental protection treatment is improved.

Description

Technical Field

[0001] This invention relates to the field of membrane bioreactor wastewater treatment technology, specifically to a membrane bioreactor wastewater treatment device with a sludge recovery and reduction structure. Background Technology

[0002] Membrane bioreactor (MBR) wastewater treatment is a highly efficient wastewater treatment process that combines membrane separation technology with biological treatment technology. It replaces the traditional secondary sedimentation tank with membrane modules to achieve efficient separation of sludge and water, resulting in stable effluent quality that can be directly reused. It consists of a bioreactor and membrane separation modules. In the bioreactor, microorganisms degrade organic matter in wastewater and simultaneously remove nitrogen and phosphorus; while the membrane modules (usually microfiltration or ultrafiltration membranes) retain activated sludge, bacteria, and large molecular organic matter, making the suspended solids and turbidity of the effluent close to zero. The effluent quality can meet the Class IV or Class A standard of the "Surface Water Environmental Quality Standard".

[0003] Application CN106365374A discloses a municipal sewage treatment device. A rotating shaft is located in the middle of the sewage treatment tank, and a first stirring rod and a second stirring rod are fixedly installed on the side of the rotating shaft. A water inlet pipe is located on the upper left side of the filter screen, and the surface of the water inlet pipe is provided with water passage holes. A tank cleaning device is fixedly installed on the upper right side of the filter screen. A booster pump, a heater and a sedimentation tank are arranged sequentially from bottom to top above the sewage treatment tank. By setting up the sedimentation tank, sewage can be pretreated. The membrane biological purification tank and the filter screen are set up to effectively improve the purification efficiency of sewage. The tank cleaning device can clean the filter screen and the membrane biological purification tank, so as to significantly improve the purification effect.

[0004] Application CN107721078A discloses a biofilm biological wastewater treatment device, which solves the technical problems in the prior art, such as the impact of ambient temperature on wastewater treatment efficiency and the inability to continue operation during emergency power outages. It includes an MBR membrane tank, an adsorption filter tank, a constant temperature control chamber, lifting hooks, a cover plate, and an exhaust window. The adsorption filter tank is welded to the right side of the MBR membrane tank, and the constant temperature control chamber is welded to the right side of the adsorption filter tank. A heating net is installed inside the MBR membrane tank, an activated carbon filter layer is installed inside the adsorption filter tank, a storage battery is installed inside the constant temperature control chamber, the lifting hooks are located on the top of the biofilm wastewater treatment device, and the top cover plate of the biofilm wastewater treatment device is configured as a solar panel.

[0005] However, the membrane bioreactor treatment device disclosed above for wastewater treatment still has the following problems in actual use: wastewater treatment is achieved through the membrane bioreactor inside the treatment device, but some wastewater and sludge are mixed together, which causes the membrane bioreactor to have high treatment pressure and accelerates blockage. At the same time, it is difficult to recycle sludge to reduce the negative pressure of treatment.

[0006] Therefore, we propose a membrane bioreactor wastewater treatment device with a sludge recycling and reduction structure to solve the problems mentioned above. Summary of the Invention

[0007] The purpose of this invention is to provide a membrane bioreactor wastewater treatment device with a sludge recovery and reduction structure. This addresses the problem that existing wastewater treatment devices use membrane bioreactors inside the treatment unit, but some wastewater and sludge are mixed together, resulting in high treatment pressure on the membrane bioreactor and accelerated clogging. It also makes it difficult to recover sludge to reduce the negative pressure during treatment.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a membrane bioreactor wastewater treatment device with a sludge recovery and reduction structure, comprising a treatment tank and a membrane reactor group disposed on the right side inside the treatment tank, wherein the membrane reactor group treats the wastewater after sludge recovery. A separation mechanism is provided on the left side inside the treatment tank, and the separation mechanism includes a separation baffle, and a separation sieve plate is fixedly provided on the middle left side of the separation baffle. The separation baffle isolates the left side of the treatment tank, and the lower end of the separation baffle has a flow channel to allow the wastewater after sludge separation to flow to the middle of the treatment tank. A sedimentation mechanism is provided in the middle of the treatment tank, and the sedimentation mechanism includes a sedimentation baffle. An overflow trough is provided on the upper part of the sedimentation baffle, and the bottom horizontal height of the overflow trough is lower than the bottom horizontal height of the separation screen plate.

[0009] Preferably, the separation mechanism includes a separation partition fixedly installed inside the left side of the treatment tank, and a separation brush plate is slidably attached to the top surface of the separation screen plate. In the initial state, the separation brush plate is located inside the separation partition plate to avoid affecting the filtration and separation of water-containing sludge by the separation screen plate. Furthermore, a transmission slider is fixedly connected to both the front and rear sides of the bottom end of the separation screen plate, and a reciprocating screw is threaded inside the transmission slider.

[0010] Preferably, the reciprocating lead screw included in the separation mechanism is rotatably mounted on the front and rear sides of the separation screen plate through bearings, and the bottom surface of the separation screen plate is elastically slidably connected to the upper end of the contact plate at equal distances, and the upper surface of the contact plate is fixedly installed with guide columns at equal distances.

[0011] Preferably, the separation mechanism includes guide columns that are distributed in the sieve holes inside the separation sieve plate, and a transmission slide column is elastically slidably provided at the outer end of the cross plate below the guide column. The transmission slide column and the inclined push plate at the lower end of the transmission slider are in contact with each other. The inclined push plate abuts against the transmission slide column, which drives the cross plate and the guide column to be inserted into the sieve holes inside the separation sieve plate to achieve unblocking.

[0012] Preferably, the separation mechanism includes an inclined water guide plate, which is fixedly installed on the lower left side inside the treatment tank and located below the separation screen plate. The inclined water guide plate is positioned with the left side higher than the right side, corresponding to the flow channel below the separation partition.

[0013] Preferably, the sedimentation mechanism includes a sedimentation baffle fixedly installed inside the right side of the treatment tank, which forms an independent sedimentation area with the separation mechanism on the left and the membrane reaction unit on the right. A positioning bracket is fixedly installed on the top surface inside the treatment tank above the sedimentation baffle, and the middle bearing of the positioning bracket is connected to the right end of the reciprocating screw.

[0014] Preferably, the sedimentation mechanism includes a driving slider, which is threaded onto the outer wall of the right end of the reciprocating screw. The inner sides of the driving sliders on the front and rear sides are slidably connected to the outer end of the spreading crossbar through a return spring. A contacting crossbar is fixedly installed on the side of the spreading crossbar near the separation partition, and a spreading filter box is fixedly installed on the bottom surface of the spreading crossbar. The bottom surface of the drive slider is fixedly equipped with a mixing branch, which is slidably installed inside the treatment tank in a front-to-back manner. The mixing branch mixes the sewage and the reagent in the sludge to achieve rapid flocculation and sedimentation.

[0015] Preferably, the sedimentation mechanism includes a reagent storage tank fixedly installed on the upper right side of the separation partition, and the bottom surface of the reagent storage tank is provided with a dispensing slot. A corresponding partition is elastically slidably installed on the right outer wall of the reagent storage tank, and a corresponding slot is provided at the lower end of the corresponding partition.

[0016] Preferably, the corresponding slots in the sedimentation mechanism are initially misaligned with the dispensing slots on the bottom of the reagent storage tank. The dispensing crossbar drives the corresponding partition, which is elastically connected to the left side, to slide to the left, so that the corresponding slots and the dispensing slots overlap, thereby dispensing the reagent into the interior of the dispensing filter box.

[0017] Preferably, the sedimentation mechanism includes vibrating crossbars fixedly installed on the front and rear sides of the spreading filter box, and the outer ends of the vibrating crossbars extend to the front and rear sides of the middle part of the treatment tank. Vibrating protrusions are fixedly installed at equal intervals above the middle part of the treatment tank, which are used to contact each other when the spreading filter box moves with the vibrating crossbars, so as to drive the agent inside the spreading filter box to be evenly spread downward.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: This membrane bioreactor wastewater treatment device with a sludge recovery and reduction structure first separates the water-containing sludge in the treatment tank, and simultaneously reduces the volume and load of the treatment tank by assisting in pushing the sludge. The reagents are then evenly added by the central spreading filter box, allowing the wastewater to overflow into the membrane reactor for efficient treatment. The specific details are as follows: 1. After the water-containing sludge is put in, the separation screen plate carries the sludge and filters the sewage. The sewage is guided by the inclined water guide plate to flow into the sedimentation zone to avoid interfering with the sludge treatment. The separation brush plate is driven by a reciprocating screw and pushes the sludge to the outside collection through the transmission slider, reducing the burden on the treatment tank and realizing the rapid separation of sludge and sewage. At the same time, it automatically cleans the bearing surface to ensure continuous operation. The movement of the separation brush plate also triggers the opening of the closed door to assist the sludge discharge and reduce the need for manual intervention. Furthermore, when the separating brush plate moves, it drives the inclined push plate to squeeze the transmission slide column, pushing the contact plate and the guide column upward to insert into the screen hole of the separating screen plate, removing the attached sludge. When the inclined push plate continues to squeeze, the transmission slide column slides outward, the contact plate elastically resets and drives the guide column downward, reopening the screen hole, ensuring uninterrupted mud-water separation, improving filtration stability. The guide column is distributed according to the screen hole, specifically solving the clogging problem and avoiding downtime for maintenance. 2. When the spreading crossbar moves, it presses against the crossbar and the corresponding partition slides, so that the corresponding slot hole coincides with the dispensing slot hole. The agent falls into the spreading filter box. After the corresponding partition is elastically reset, it is offset to close the dispensing port to prevent the agent from spilling. After the agent is mixed with the sewage, it is stirred by the mixing branch to promote flocculation. The overflow cross trough controls the sewage flow to the membrane reaction group to ensure that the sedimentation zone operates independently. 3. When the spreading crossbar moves the spreading filter box, the vibrating crossbar contacts the vibrating protrusions on the top surface of the treatment tank, triggering up and down vibration, which helps the agent to be evenly distributed. The reset spring buffers the vibration impact, ensuring the stable operation of the spreading filter box. The vibrating protrusions are evenly distributed, so that the agent coverage is wider. 4. After the sludge is filtered by the separation screen plate, it is reduced and recovered. The sewage flows into the sedimentation zone and mixes with the reagents for flocculation. Then it overflows through the overflow chute to the membrane reactor for treatment. The separation brush plate pushes the sludge and triggers the unblocking. The seeding filter box of the sedimentation mechanism vibrates to seed the reagents. The mixing branch strengthens the stirring and forms an efficient closed loop, which improves the sludge recovery rate and sewage treatment quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the inclined water-guiding plate installation structure of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the separating sieve plate of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a schematic diagram of the structure of the guide column after it rises according to the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point B; Figure 7 This is a schematic diagram of the installation structure of the drug storage tank of the present invention; Figure 8 For the present invention Figure 7 Enlarged structural diagram at point C; Figure 9 This is a schematic diagram of the three-dimensional structure of the spraying filter box of the present invention; Figure 10 For the present invention Figure 9 Enlarged structural diagram at point D.

[0020] In the diagram: 1. Treatment tank; 2. Membrane reactor; 3. Separation baffle; 4. Separation sieve; 5. Flow channel; 6. Sedimentation baffle; 7. Overflow channel; 8. Separation brush; 9. Drive slider; 10. Reciprocating screw; 11. Contact plate; 12. Guide column; 13. Drive slide column; 14. Inclined push plate; 15. Inclined water guide plate; 16. Mixing branch; 17. Positioning bracket; 18. Drive slider; 19. Return spring; 20. Spreading bar; 21. Contact frame; 22. Spreading filter box; 23. Chemical storage tank; 24. Dosing slot; 25. Corresponding baffle; 26. Corresponding slot; 27. Vibration bar; 28. Vibration protrusion. Detailed Implementation

[0021] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-10 The present invention provides the following technical solution: Example 1: To address the problems existing in current membrane bioreactor wastewater treatment, this example discloses the following technical solution: a membrane bioreactor wastewater treatment device with a sludge recovery and reduction structure, comprising a treatment tank 1, a separation mechanism is provided on the left side of the treatment tank 1, and the separation mechanism includes a separation baffle 3, and a separation screen plate 4 is fixedly provided on the middle left side of the separation baffle 3; wherein, the separation baffle 3 isolates the left side area of ​​the treatment tank 1, and a flow channel 5 is provided inside the lower end of the separation baffle 3 for flowing the wastewater after sludge separation to the middle of the treatment tank 1, and the separation baffle 3 included in the separation mechanism is fixedly installed on the left side of the treatment tank 1.

[0023] like Figures 1-2 As shown, when water-containing sludge needs to be treated, the water-containing sludge is first placed inside the left side of the treatment tank 1. The separation screen plate 4 at the middle of the left end of the separation baffle 3 first supports the water-containing sludge, and the separation screen plate 4 filters the sewage inside the water-containing sludge downwards so that the sludge is stored above the separation screen plate 4. At the same time, the filtered sewage comes into contact with the inclined water guide plate 15 below. The inclined water guide plate 15, which is higher on the left and lower on the right, guides the sewage to the right so that it flows through the flow channel 5 opened at the bottom inside the separation baffle 3 to the sedimentation area in the middle of the treatment tank 1 for storage, so as to avoid affecting the treatment operation of the sludge above.

[0024] A separation brush plate 8 slides against the top surface of the separation screen plate 4. In the initial state, the separation brush plate 8 is located inside the separation partition plate 3 to avoid affecting the filtration and separation of water-containing sludge by the separation screen plate 4. A transmission slider 9 is fixedly connected to both the front and rear sides of the bottom end of the separation screen plate 4, and a reciprocating screw 10 is threaded inside the transmission slider 9. The reciprocating screw 10 included in the separation mechanism is rotatably installed on both the front and rear sides inside the separation screen plate 4 through bearings.

[0025] like Figures 3-5 As shown, the separated sludge is carried by the separation screen plate 4. The reciprocating screw 10 is rotated by a motor outside the treatment tank 1. The transmission slider 9, which is threadedly connected to the reciprocating screw 10, is positioned by the separation screen plate 4 so that the separation brush plate 8, which is fixedly connected at the upper end, can slide to the left. The separation brush plate 8 pushes the sludge and pushes the sludge attached to the upper surface of the separation screen plate 4. When it moves close to the left side of the treatment tank 1, the separation brush plate 8 abuts against the closed door opened on the left side of the treatment tank 1 to help push the sludge to the outside of the left side of the treatment tank 1 for collection, thereby reducing the amount of sludge and reducing the operating burden of the treatment tank 1.

[0026] Example 2: To address the problems existing in current membrane bioreactor wastewater treatment, this example discloses the following technical solution: the bottom surface of the separation sieve plate 4 is elastically slidably connected to the upper end of the contact plate 11 at equal distances, and the upper surface of the contact plate 11 is fixedly installed with guide columns 12 at equal distances; the guide columns 12 included in the separation mechanism are distributed in the sieve holes inside the separation sieve plate 4, and the outer end of the contact plate 11 below the guide column 12 is elastically slidably provided with a transmission slide column 13, and the transmission slide column 13 is in contact with the inclined push plate 14 at the lower end of the transmission slider 9. The inclined push plate 14 abuts against the transmission slide column 13, driving the contact plate 11 and the guide column 12 to be inserted into the sieve holes inside the separation sieve plate 4 to achieve unblocking.

[0027] The separation mechanism includes an inclined water guide plate 15, which is fixedly installed on the lower left side inside the treatment tank 1. The inclined water guide plate 15 is located below the separation screen plate 4, and the inclined water guide plate 15 is positioned with the left side higher and the right side lower, corresponding to the flow channel 5 below the separation partition plate 3.

[0028] like Figures 5-6 As shown, during the movement of the separation brush plate 8 above the separation screen plate 4, the transmission slider 9 at its bottom drives the fixedly connected inclined push plate 14 to move synchronously. When it contacts the transmission slide column 13 at the outer end of the contact horizontal plate 11, the elastic force of the elastic transmission slide column 13 is greater than the weight of the contact horizontal plate 11 and the guide column 12 (containing mud and water). Thus, the transmission slide column 13 is guided by the contact horizontal plate 11 and drives the contact horizontal plate 11 and the guide column 12 to move upward so that the guide column 12 can be inserted into the screen hole inside the separation screen plate 4, thereby clearing part of the screen hole blocked by sludge and pushing and cleaning it through the moving separation brush plate 8.

[0029] Furthermore, as the inclined push plate 14 moves, it gradually squeezes the transmission slide column 13, causing the transmission slide column 13 to slide outward. After the transmission slide column 13 is continuously squeezed until its inner end is at the same level as the inner wall of the contact horizontal plate 11, the transmission slide column 13 is no longer squeezed by the inclined push plate 14. Then, through the elastically connected contact horizontal plate 11, it drives the guide column 12 to slide downward, so as to open the screen holes inside the separation screen plate 4, thereby continuing the subsequent mud-water separation operation.

[0030] Example 3: In order to solve the problems existing in the current membrane bioreactor wastewater treatment, this example discloses the following technical solution: A sedimentation mechanism is provided in the middle of the treatment tank 1, and the sedimentation mechanism includes a sedimentation baffle 6. An overflow transverse trough 7 is provided on the upper part of the interior of the sedimentation baffle 6. The bottom horizontal height of the overflow transverse trough 7 is lower than the bottom horizontal height of the separation screen plate 4. The sedimentation baffle 6 included in the sedimentation mechanism is fixedly installed on the right side of the interior of the treatment tank 1, so as to form an independent sedimentation area with the separation mechanism on the left and the membrane reaction group 2 on the right.

[0031] A positioning bracket 17 is fixedly installed on the top surface inside the treatment tank 1 above the sedimentation baffle 6, and the middle bearing of the positioning bracket 17 is connected to the right end of the reciprocating screw 10; the sedimentation mechanism includes a driving slider 18, and the driving slider 18 is threadedly sleeved on the outer wall of the right end of the reciprocating screw 10, and the inner sides of the front and rear driving sliders 18 are slidably connected to the outer end of the spreading crossbar 20 through the return spring 19, and an abutting crossbar 21 is fixedly installed on the side of the spreading crossbar 20 near the separation baffle 3, and a spreading filter box 22 is fixedly installed on the bottom surface of the spreading crossbar 20.

[0032] The sedimentation mechanism includes a reagent storage tank 23 fixedly installed on the upper right side of the separation partition 3. The bottom surface of the reagent storage tank 23 is provided with a dispensing slot 24, and a corresponding partition 25 is elastically slidably installed on the right outer wall of the reagent storage tank 23. At the same time, a corresponding slot 26 is provided at the lower end of the corresponding partition 25. The corresponding slot 26 in the sedimentation mechanism is initially misaligned with the dispensing slot 24 on the bottom surface of the reagent storage tank 23. The spreading crossbar 20 drives the left-side abutting crossbar 21 to squeeze the elastically connected corresponding partition 25 to slide to the left, so that the corresponding slot 26 and the dispensing slot 24 coincide with each other, thereby dispensing the reagent into the interior of the spreading filter box 22.

[0033] like Figures 9-10 As shown, after separation, the wastewater flows to the middle of the treatment tank 1. During the rotation of the reciprocating screw 10, it drives the threaded drive slider 18, the spreading crossbar 20, and the spreading filter box 22 to slide to the left. When the opposing crossbar 21 on the left side of the spreading crossbar 20 interacts with the corresponding partition 25 on the right side of the chemical storage tank 23, the compressed corresponding partition 25 slides to the left, thereby causing the corresponding slot 26 at the bottom to move and correspond with the dispensing slot 24 at the bottom of the chemical storage tank 23. This allows the internal chemical to be transported downward to the spreading filter box 22 at the lower end of the spreading crossbar 20. When the spreading crossbar 20 moves in the opposite direction, the non-opposing corresponding partition 25 moves in the opposite direction through elastic force, causing the corresponding slot 26 and the dispensing slot 24 to misalign. This closes the chemical storage tank 23, preventing the internal chemical from spilling and affecting the treatment effect.

[0034] Example 4: In order to solve the problems existing in the current membrane bioreactor wastewater treatment, this example discloses the following technical solution: The sedimentation mechanism includes vibrating crossbars 27 fixedly installed on the front and rear sides of the spreading filter box 22, and the outer ends of the vibrating crossbars 27 extend to the front and rear sides of the middle part of the treatment tank 1. Vibrating protrusions 28 are fixedly installed at equal intervals above the middle part of the treatment tank 1, which are used to contact each other when the spreading filter box 22 moves the vibrating crossbars 27, so as to drive the agent inside the spreading filter box 22 to be evenly spread downward.

[0035] A mixing branch 16 is fixedly installed on the bottom surface of the drive slider 18, and the mixing branch 16 is slidably installed inside the treatment tank 1 in a front-to-back manner. The mixing branch 16 mixes the sewage in the sludge with the reagent to achieve rapid flocculation and sedimentation. The membrane reactor 2 is set on the right side inside the treatment tank 1, and the membrane reactor 2 treats the sewage after sludge recovery.

[0036] like Figure 2 , Figures 7-8 As shown, when the reciprocating screw 10 drives the threaded drive slider 18, the spreading crossbar 20, and the spreading filter box 22 to move to the right, the vibrating crossbars 27 at both ends of the spreading filter box 22 slide on the top surface of the treatment tank 1. During the sliding process, they come into contact with the vibrating protrusions 28 that are evenly distributed on the top surface of the treatment tank 1. The vibrating protrusions 28 then push against the vibrating crossbars 27 and move upward, thereby causing the spreading filter box 22 connected to the return spring 19 to vibrate synchronously in the up and down direction. This helps to spread the medicine stored inside during the movement and improves the uniformity of the medicine dispensing.

[0037] Furthermore, the drive slider 18 inside the treatment tank 1 moves synchronously with the mixing branch 16 at the lower end, which extends into the wastewater mixed with the agent, helping to improve the uniformity of the mixing between the agent and the wastewater. When continuously storing water, it is limited by the sedimentation baffle 6 on the right side, and after exceeding the height of the overflow transverse channel 7, it flows into the membrane reaction group 2 on the right side, and then the membrane reaction group 2 performs biological separation treatment on the wastewater.

[0038] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A membrane bioreactor wastewater treatment device with a sludge recovery and reduction structure, comprising a treatment tank (1) and a membrane reactor (2) disposed on the right side inside the treatment tank (1), wherein the membrane reactor (2) treats the wastewater after sludge recovery; Its features are, Also includes: The processing tank (1) has a separation mechanism on the left side inside, and the separation mechanism includes a separation partition (3), and a separation sieve plate (4) is fixedly installed in the middle of the left side of the separation partition (3). Among them, the separation baffle (3) isolates the left side area of ​​the treatment tank (1), and the lower end of the separation baffle (3) is provided with a flow channel (5) for the sewage after sludge separation to flow to the middle of the treatment tank (1). The treatment tank (1) is provided with a sedimentation mechanism in the middle, and the sedimentation mechanism includes a sedimentation baffle (6). An overflow trough (7) is provided above the interior of the sedimentation baffle (6). The bottom horizontal height of the overflow trough (7) is lower than the bottom horizontal height of the separation sieve plate (4). The separation mechanism includes a separation partition (3) fixedly installed inside the treatment tank (1) on the left side, and a separation brush (8) is attached to the top surface of the separation screen (4). In the initial state, the separation brush (8) is located inside the separation partition (3) to avoid affecting the filtration and separation of water-containing sludge by the separation screen (4). The bottom end of the separation screen (4) is fixedly connected to both the front and rear sides with a transmission slider (9), and the transmission slider (9) is internally threaded with a reciprocating screw (10). The reciprocating screw (10) included in the separation mechanism is rotatably installed on the front and rear sides of the separation screen plate (4) through bearings, and the bottom surface of the separation screen plate (4) is elastically slidably connected to the upper end of the contact plate (11) at equal distances, and the upper surface of the contact plate (11) is fixedly installed with guide columns (12) at equal distances. The separation mechanism includes a guide column (12) that corresponds to the sieve holes inside the separation sieve plate (4). The guide column (12) is elastically slidably provided with a transmission slide column (13) at the outer end of the horizontal plate (11) below it. The transmission slide column (13) and the inclined push plate (14) at the lower end of the transmission slider (9) are in contact with each other. The inclined push plate (14) abuts against the transmission slide column (13) and drives the horizontal plate (11) and the guide column (12) to be inserted into the sieve holes inside the separation sieve plate (4) to achieve unblocking. The sedimentation mechanism includes a drive slider (18), which is threaded onto the outer wall of the right end of the reciprocating screw (10). The inner sides of the drive sliders (18) on both the front and rear sides are slidably connected to the outer end of the spreading crossbar (20) by a return spring (19). A contact crossbar (21) is fixedly installed on the side of the spreading crossbar (20) near the separation partition (3), and a spreading filter box (22) is fixedly installed on the bottom surface of the spreading crossbar (20).

2. The membrane bioreactor wastewater treatment device with sludge recovery and reduction structure according to claim 1, characterized in that: The separation mechanism includes an inclined water guide plate (15), which is fixedly installed on the lower left side inside the treatment tank (1). The inclined water guide plate (15) is located below the separation screen plate (4), and the inclined water guide plate (15) is positioned with the left side higher and the right side lower, corresponding to the flow channel (5) below the separation partition plate (3).

3. The membrane bioreactor wastewater treatment device with sludge recovery and reduction structure according to claim 1, characterized in that: The sedimentation mechanism includes a sedimentation baffle (6) which is fixedly installed on the inside right side of the treatment tank (1) to form an independent sedimentation area with the separation mechanism on the left and the membrane reaction group (2) on the right. A positioning bracket (17) is fixedly installed on the top surface inside the treatment tank (1) above the sedimentation baffle (6), and the middle bearing of the positioning bracket (17) is connected to the right end of the reciprocating screw (10).

4. The membrane bioreactor wastewater treatment device with sludge recovery and reduction structure according to claim 3, characterized in that: The bottom surface of the drive slider (18) is fixedly installed with a mixing branch (16), and the mixing branch (16) is slidably installed inside the treatment tank (1) in a front-to-back symmetrical manner. The mixing branch (16) mixes the sewage in the sludge with the reagent to achieve rapid flocculation and sedimentation.

5. A membrane bioreactor wastewater treatment device with a sludge recovery and reduction structure according to claim 1, characterized in that: The precipitation mechanism includes a reagent storage tank (23) fixedly installed on the upper right side of the separation partition (3), and the bottom surface of the reagent storage tank (23) is provided with a dispensing slot (24). A corresponding partition (25) is elastically slidably installed on the right outer wall of the reagent storage tank (23), and a corresponding slot (26) is provided at the lower end of the corresponding partition (25).

6. A membrane bioreactor wastewater treatment device with a sludge recovery and reduction structure according to claim 5, characterized in that: The sedimentation mechanism includes corresponding slots (26) that are initially misaligned with the injection slots (24) on the bottom surface of the drug storage tank (23). The spreading crossbar (20) drives the left-side abutting crossbar (21) to press the elastically connected corresponding partition (25) to slide to the left, so that the corresponding slots (26) and injection slots (24) overlap, thereby injecting the drug into the interior of the spreading filter box (22).

7. A membrane bioreactor wastewater treatment device with a sludge recovery and reduction structure according to claim 6, characterized in that: The sedimentation mechanism includes vibrating crossbars (27) fixedly installed on the front and rear sides of the spreading filter box (22), and the outer ends of the vibrating crossbars (27) extend to the front and rear sides of the middle part of the treatment tank (1). Vibrating protrusions (28) are fixedly installed at equal intervals above the middle part of the treatment tank (1) for contacting each other when the spreading filter box (22) moves with the vibrating crossbars (27), thereby driving the agent inside the spreading filter box (22) to be evenly spread downward.

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