MBR membrane bioreactor for advanced treatment of papermaking wastewater

Abstract

The present invention belongs to the technical field of sewage treatment equipment, in particular to an MBR membrane bioreactor for deep treatment of papermaking wastewater. In view of the problems that dirt adheres to the outer wall of the existing MBR membrane bioreactor, the dirt in the reaction tank cannot be removed, the treatment function is single, and the water quality cannot be further improved, the following scheme is proposed, including a reaction tank, wherein a sewage treatment structure for treating sewage is provided in the reaction tank, the bottom inner wall of the reaction tank is rotatably connected to a rotating shaft, the top of the rotating shaft is fixed with a supporting plate for supporting the sewage treatment structure, and scrapers are fixed on both sides of the top of the supporting plate. In the present invention, during the process of sewage treatment by the membrane filter tube, the dirt adhered to the outer wall of the filter frame can be removed by the cooperation of the supporting plate and the scraper. At the same time, the rotation of the supporting plate can also alternately inject oxygen into the reaction tank and the clean water tank, which can not only improve the water quality in the clean water tank but also facilitate the treatment of sewage in the reaction tank.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment equipment, in particular to an MBR membrane bioreactor for deep treatment of papermaking wastewater. Background Art

[0002] Papermaking wastewater treatment equipment, aided by chemical flocculants, can minimize SS and COD in wastewater. In the papermaking industry, this equipment is widely used to treat paper machine white water, mid-stream wastewater, and deinking wastewater. It effectively recovers fiber resources while ensuring that treated wastewater meets reuse or discharge standards, significantly alleviating environmental pressures.

[0003] As a new water treatment technology, the MBR membrane bioreactor (MBR) combines a membrane separation unit with a biological treatment unit and has been widely used in wastewater treatment. Using membrane modules, it replaces the secondary sedimentation tanks used in traditional biological treatment technologies. Maintaining a high activated sludge concentration within the bioreactor increases organic load handling capacity and reduces the footprint of wastewater treatment facilities. Furthermore, by maintaining a low sludge load, the reactor effectively reduces excess sludge production.

[0004] However, the existing technology still has some shortcomings when treating sewage:

[0005] 1. When the MBR membrane bioreactor is running for a long time, a large amount of dirt is likely to accumulate on its outer wall. This dirt not only seriously affects the sewage treatment efficiency of the reactor, but may also enter the reactor and adhere to the outer wall of the MBR membrane filter tube, causing the reactor to operate obstructed.

[0006] 2. The sewage treatment function is relatively simple, and the treated water is mainly used for storage or discharge, lacking the ability to further improve water quality;

[0007] In response to the above problems, the present invention document proposes an MBR membrane bioreactor for deep treatment of papermaking wastewater. Summary of the Invention

[0008] The purpose of the present invention is to solve the shortcomings of the existing MBR membrane bioreactor, such as dirt adhering to the outer wall, the dirt in the reaction tank cannot be removed, the treatment function is single, and the water quality cannot be further improved. The MBR membrane bioreactor for deep treatment of papermaking wastewater is proposed.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] The MBR membrane bioreactor for deep treatment of papermaking wastewater includes a reaction tank, a sewage treatment structure for treating sewage is provided in the reaction tank, a rotating shaft is rotatably connected to the inner wall of the bottom of the reaction tank, a supporting plate for supporting the sewage treatment structure is fixed on the top of the rotating shaft, scrapers are fixed on both sides of the top of the supporting plate, and the sewage treatment structure is located between the two scrapers, and the scrapers are used to remove dirt attached to the surface of the sewage treatment structure;

[0011] It also includes a clean water tank fixed to one side of the reaction tank, a pump fixed on the top of the clean water tank, the liquid inlet end of the pump is connected to the sewage treatment structure through a hose, and the liquid outlet end of the pump is connected to the clean water tank through a hose, and the pump is used to discharge the clean water treated by the sewage treatment structure into the clean water tank;

[0012] It also includes two scraping bars, both of which are slidably arranged in the reaction tank and are located above the sewage treatment structure to remove dirt floating on the water surface;

[0013] An oxygen injection box is provided on one side of the reaction tank, and one end of the oxygen injection box away from the reaction tank is connected to an external oxygen generating device through a pipeline;

[0014] An oxygen injection structure is provided in the oxygen injection box and is used to alternately inject oxygen into the reaction tank and the clean water tank;

[0015] The cleaning structure is arranged on the top of the reaction tank and is used to drive the two scraping bars to move toward each other to remove the dirt scraped from the outer wall of the sewage treatment structure;

[0016] The driving structure is arranged at the bottom of the supporting plate and is used to drive the oxygen injection structure to inject oxygen into the reaction tank and the clean water tank alternately.

[0017] In one possible design, the sewage treatment structure includes a top plate, a filter frame and multiple membrane filter tubes, the multiple membrane filter tubes can be detachably fixed to the bottom of the top plate, the filter frame can be detachably fixed to the bottom of the top plate, and the multiple membrane filter tubes are all located in the filter frame for filtering sewage, the liquid inlet end of the pump is connected to the top plate through a hose, the filter frame is placed on the top of the supporting plate, and two scrapers are located on both sides of the filter frame for scraping off dirt attached to the outer wall of the filter frame; through the cooperation of the pump and the membrane filter tube, the clean water treated by the membrane filter tube is injected into the clean water tank, and the motor drives the scraper to rotate through the cooperation of the rotating shaft and the supporting plate to remove the dirt attached to the outer wall of the filter frame, and the removed dirt floats upward under the impact of oxygen injected into the aeration pipe.

[0018] In one possible design, the oxygen injection structure includes a piston block that slides in a sealed manner in the oxygen injection box, a T-shaped hole is provided in the piston block, an oxygen injection tube is fixed on the top of the oxygen injection box, and the top end of the oxygen injection tube is fixedly connected to the bottom end of the clean water tank, and the oxygen injection tube is communicated with the clean water tank, one end of the T-shaped hole cooperates with the oxygen injection tube, a magnet strip is fixedly embedded on the top inner wall of the oxygen injection box, a closing plate is slidably connected to the side of the piston block close to the reaction tank, and the closing plate is used to block the other end of the T-shaped hole, a stopper located below the closing plate is fixed on one side of the piston block, and the stopper is used to support the closing plate, an iron sheet is fixedly embedded on the top of the closing plate, and the closing plate generates magnetic attraction through the iron sheet and the magnet strip, a multi-way pipe is fixed on one end of the oxygen injection box close to the reaction tank, and the reaction tank A plurality of aeration pipes located below the supporting plate are fixed in the pool, and the multi-way pipe is connected to the plurality of aeration pipes; when one end of the T-hole is connected to the oxygen injection pipe, oxygen is injected into the clean water tank through the cooperation of the T-hole and the oxygen injection pipe to improve the water quality of the clean water and facilitate later use. When the piston block moves to the left, one end of the T-hole is misaligned with the oxygen injection pipe. At this time, one end of the T-hole is blocked by the inner wall of the top of the oxygen injection tank, and the magnetic attraction generated by the magnet bar on the iron layer on the top of the closing plate drives the closing plate to move up, releasing the blockage of the other end of the T-hole. At this time, oxygen is injected into the reaction pool through the cooperation of the multi-way pipe and the aeration pipe for sewage treatment. In the aeration process, the oxygen floats and carries the dirt scraped by the scraper to the water surface, which is convenient for removing the dirt later. Oxygen can be injected into the clean water tank and the reaction pool alternately.

[0019] In one possible design, the driving structure includes an arc-shaped plate fixed to the bottom of the supporting plate, a sliding rod slidingly penetrates one side of the reaction pool, and the sliding rod is located below the arc-shaped plate, one end of the sliding rod extends into the reaction pool and is fixed with a pin rod, the pin rod cooperates with the arc-shaped plate, the other end of the sliding rod is fixed with a U-shaped block, and the U-shaped block is slidably arranged on the top of the oxygen injection box, the two bottom ends of the U-shaped block are fixed with iron sheets, the outer wall of the sliding rod is provided with a first spring fixedly connected to the reaction pool, the end of the first spring away from the reaction pool is fixedly connected to the outer wall of the sliding rod, the top of the piston block is fixedly embedded with two strong magnets, and the U-shaped block is fixedly mounted on the top of the piston block. The iron layer and the two strong magnets generate magnetic attraction; when the rotating shaft drives the bearing plate to rotate, the cooperation of the arc plate and the pin rod drives the sliding rod and the U-shaped block to move to the left, and the magnetic attraction between the iron layer at the bottom of the U-shaped block and the strong magnet drives the piston block to move to the left, and one end of the T-shaped hole is misaligned with the oxygen injection pipe. At this time, one end of the T-shaped hole is blocked by the inner wall of the top of the oxygen injection box, and the magnetic attraction generated by the magnet bar on the iron layer on the top of the closing plate drives the closing plate to move up, releasing the blockage of the other end of the T-shaped hole. At this time, oxygen is injected into the reaction tank through the cooperation of the multi-way pipe and the aeration pipe for sewage treatment. In the aeration process, the oxygen floats up and carries the dirt scraped by the scraper to the water surface, making it easier to remove the dirt later.

[0020] In one possible design, the cleaning structure includes a U-shaped frame fixed to the top of the reaction pool, two guide rods are fixed in the reaction pool, and the two guide rods slide through the two scraping strips, and two second springs are fixed on the side of the two scraping strips away from each other, and the ends of the four second springs away from the scraping strips are respectively fixedly connected to the inner wall of one side of the corresponding reaction pool, and the second spring is sleeved on the outer wall of the guide rod, and the cooperation between the guide rod and the second spring is used to drive the scraping strip to reset to the middle, and a nut block is rotatably connected in the U-shaped frame, and a screw is passed through the internal thread of the nut block, and the bottom end of the screw is fixedly connected to the top of the top plate, and a first bevel gear is fixed on the top of the nut block, and a driving motor is fixed to the top of the U-shaped frame through the frame, and the output shaft of the driving motor is fixed with a second bevel gear meshing with the first bevel gear, and the driving motor can The bottom ends of the two scraping strips are fixed with ropes, and the bottom ends of the two ropes are fixedly connected to the bottom of the top plate. The inner walls of the reaction tanks away from each other are provided with guide wheels, and the guide wheels are used to guide the ropes, and the top plate and the ropes cooperate to pull the scraping strips outward; when the membrane filter tube needs to be cleaned, the second bevel gear is driven by the driving motor to rotate, and the cooperation of the second bevel gear and the first bevel gear drives the nut block to rotate, and the nut block cooperates with the screw to drive the top plate to move up, and the membrane filter tube and the filter frame are pulled upward out of the reaction tank, and the filter frame, membrane filter tube and the top plate are removable, which is convenient for cleaning the membrane filter tube in the later stage. In addition, when the top plate moves up, a pulling force is generated on the rope, and the rope pulls the scraping strip outward, which can gather the dirt floating on the water surface to one side, which is convenient for unified cleaning in the later stage. When the top plate moves up to the water surface, the scraping strip moves out from above the top plate to avoid collision between the scraping strip and the top plate.

[0021] In one possible design, an annular groove is provided at the bottom of the top plate, and the top ends of the two scrapers extend into the annular groove and slide in cooperation with the annular groove. The cooperation between the annular groove and the scraper is used to increase the stability of the supporting plate and the scraper.

[0022] In one possible design, connecting ears are fixed on both sides of the top plate, and the sides of the two connecting ears away from the top plate are slidably engaged with the inner wall of one side of the reaction tank and the U-shaped frame to ensure the smooth lifting and lowering of the top plate.

[0023] In one possible design, a second one-way valve is provided in the oxygen injection pipe to prevent clean water in the clean water tank from flowing into the oxygen injection box, and a first one-way valve is provided in the multi-way pipe to prevent sewage in the reaction tank from flowing into the oxygen injection box.

[0024] In one possible design, a scraper is fixed in the filter frame, a plurality of first through holes are provided in the scraper, and the bottom end of the membrane filter tube passes through the first through hole, and the membrane filter tube cooperates with the first through hole to scrape off the dirt attached to the outer wall of the membrane filter tube, a fixing rod is fixed to the bottom of the top plate, a plurality of hemispherical rubber blocks are fixed to the outer wall of the fixing rod, a second through hole is provided in the scraper, and the bottom end of the fixing rod passes through the second through hole, the diameter of the second through hole is smaller than the total distance between the hemispherical rubber block and the fixing rod, and the second through hole is provided in the scraper. The hole cooperates with the fixed rod and the hemispherical rubber block to drive the scraper to vibrate; when cleaning the membrane filter tube, the fixation between the filter frame and the top plate is released, and as the top plate drives the membrane filter tube to move upward, the first through hole cooperates with the membrane filter tube to preliminarily remove the dirt attached to the outer wall of the membrane filter tube, and when the top plate drives the fixed rod to move upward, the cooperation between the hemispherical rubber block and the fixed rod can generate an upward pulling force on the scraper, so the scraper is continuously vibrated during the upward movement of the fixed rod and the hemispherical rubber block, and the dirt scraped off the scraper can be shaken off.

[0025] In one possible design, a sewage outlet is provided at the bottom of the filter frame, and a concave disc that cooperates with the sewage outlet is fixed to the inner wall of the bottom of the filter frame; the dirt scraped off the scraper is shaken off the scraper by the cooperation of the hemispherical rubber block and the second through hole, and the dirt is easily discharged from the sewage outlet under the action of the concave disc.

[0026] Beneficial effects: In the present invention, a T-shaped hole is provided in the piston block, an oxygen injection pipe connected to the clean water tank is fixed on the top of the oxygen injection box, a magnet strip is fixedly embedded on the top inner wall of the oxygen injection box, a closing plate is slidably connected to the side of the piston block close to the reaction tank, and a multi-way pipe is fixed on one end of the oxygen injection box close to the reaction tank; when one end of the T-shaped hole is connected to the oxygen injection pipe, oxygen is injected into the clean water tank through the cooperation of the T-shaped hole and the oxygen injection pipe, so as to improve the water quality of the clean water and facilitate later use; when the piston block moves to the left, the blockage of the other end of the T-shaped hole is released, and oxygen can be injected into the reaction tank through the multi-way pipe, and during the aeration process, the oxygen floats up and carries the dirt scraped by the scraper to the water surface, which is convenient for removing the dirt later, and oxygen can be injected into the clean water tank and the reaction tank alternately;

[0027] In the present invention, a rotating shaft is rotatably connected to the inner wall of the bottom of the reaction tank, a carrying plate is fixed on the top of the rotating shaft, scrapers are fixed on both sides of the top of the carrying plate, and the filter frame is located between the two scrapers. The scrapers are used to remove dirt attached to the surface of the filter frame; the motor drives the scrapers to rotate through the cooperation of the rotating shaft and the carrying plate to remove dirt attached to the outer wall of the filter frame, and the removed dirt floats upward under the impact of oxygen injected into the aeration pipe, which is convenient for later removal of the dirt;

[0028] In the present invention, a nut block is rotatably connected in the U-shaped frame, and a screw fixedly connected to the top of the top plate is passed through the internal thread of the nut block. Ropes are fixed to the bottoms of the two scraping strips, and the bottom ends of the two ropes are fixedly connected to the bottom of the top plate. Guide wheels are provided on the inner walls of the reaction pools on the sides away from each other; when the top plate moves up, tension is generated on the ropes, and the ropes pull the scraping strips outward, which can gather dirt floating on the water surface to one side, making it easier to clean uniformly later.

[0029] In the present invention, during the process of treating sewage by the membrane filter tube, the dirt attached to the outer wall of the filter frame can be removed by the cooperation of the supporting plate and the scraper. At the same time, the rotation of the supporting plate can also alternately inject oxygen into the reaction tank and the clean water tank, which can not only improve the water quality in the clean water tank but also facilitate the treatment of sewage in the reaction tank. In addition, when the aeration pipe aerates the reaction tank, the scraped dirt is discharged to the water surface, which is convenient for the top plate and the scraper to cooperate to remove the dirt in the later stage, thereby ensuring that the sewage treatment can be carried out smoothly in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the three-dimensional structure of an MBR membrane bioreactor for advanced treatment of papermaking wastewater provided in Example 1 of the present invention;

[0031] Figure 2 This is a schematic cross-sectional view of an MBR membrane bioreactor for advanced treatment of papermaking wastewater provided in Example 1 of the present invention;

[0032] Figure 3 A schematic diagram of a three-dimensional exploded structure of a clean water tank, a filter frame, and a supporting plate of an MBR membrane bioreactor for advanced treatment of papermaking wastewater provided in Example 1 of the present invention;

[0033] Figure 4 A schematic diagram of a three-dimensional exploded structure of a top plate and a scraper of an MBR membrane bioreactor for advanced treatment of papermaking wastewater provided in Example 1 of the present invention;

[0034] Figure 5 A schematic diagram of a three-dimensional exploded structure of a support plate, a curved plate, and a pin rod of an MBR membrane bioreactor for advanced treatment of papermaking wastewater provided in Example 1 of the present invention;

[0035] Figure 6 This is a schematic diagram of the three-dimensional structure of the aeration pipe, multi-way pipe and oxygen injection box of the MBR membrane bioreactor for deep treatment of papermaking wastewater provided in Example 1 of the present invention;

[0036] Figure 7 A schematic three-dimensional cross-sectional view of an oxygen injection box of an MBR membrane bioreactor for advanced treatment of papermaking wastewater provided in Example 1 of the present invention;

[0037] Figure 8 This is a schematic diagram of a three-dimensional explosion structure of a piston block, a U-shaped block and a closing plate of an MBR membrane bioreactor for deep treatment of papermaking wastewater provided in Example 1 of the present invention;

[0038] Figure 9 A schematic diagram of the three-dimensional structure of a U-shaped frame, scraper bars and top plate of an MBR membrane bioreactor for advanced treatment of papermaking wastewater provided in Example 1 of the present invention;

[0039] Figure 10 A schematic diagram of a three-dimensional exploded structure of a U-shaped frame, a nut block, and a first bevel gear of an MBR membrane bioreactor for advanced treatment of papermaking wastewater provided in Example 1 of the present invention;

[0040] Figure 11 This is a schematic cross-sectional view of the filter frame and top plate of an MBR membrane bioreactor for advanced treatment of papermaking wastewater provided in Example 2 of the present invention;

[0041] Figure 12 for Figure 11 Enlarged structural diagram at point A in the middle.

[0042] In the figure: 1, reaction tank; 2, rotating shaft; 3, bearing plate; 4, scraper; 5, filter frame; 6, top plate; 7, connecting ear; 8, membrane filter tube; 9, clean water tank; 10, pump; 11, aeration pipe; 12, oxygen injection box; 13, multi-way pipe; 14, piston block; 15, T-hole; 16, oxygen injection pipe; 17, closing plate; 18, stopper; 19, magnet bar; 20, strong magnet; 21, U-shaped block; 22, sliding rod; 23, first spring; 24, pin; 25, arc shaped plate; 26, first one-way valve; 27, concave disc; 28, U-shaped frame; 29, nut block; 30, first bevel gear; 31, drive motor; 32, second bevel gear; 33, screw; 34, scraper; 35, guide rod; 36, second spring; 37, guide wheel; 38, rope; 39, annular groove; 40, second one-way valve; 41, scraper; 42, first through hole; 43, second through hole; 44, fixing rod; 45, hemispherical rubber block; 46, sewage outlet. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0044] Example 1: Reference Figure 1 and Figure 2The MBR membrane bioreactor, used in sewage treatment equipment, primarily comprises a rectangular reaction tank 1, which houses a sewage treatment structure. A vertically disposed shaft 2 is rotatably connected to the bottom inner wall of the reaction tank 1 via a bearing. A horizontally disposed support plate 3 is fixedly attached to the top of the shaft 2, supporting the sewage treatment structure.

[0045] Reference Figure 1-Figure 3 The sewage treatment structure specifically includes a top plate 6, a filter frame 5 and a plurality of membrane filter tubes 8. A plurality of membrane filter tubes 8 are detachably fixed to the bottom of the top plate 6 by bolts or the like, and these membrane filter tubes 8 are used to filter and treat the sewage. At the same time, the filter frame 5 is also detachably fixed to the bottom of the top plate 6 by bolts or the like, and the plurality of membrane filter tubes 8 are all located inside the filter frame 5 to further fix and protect the membrane filter tubes 8. Scrapers 4 are fixed on both sides of the top of the supporting plate 3, respectively. The scrapers 4 are vertically arranged, and the space between the two scrapers 4 is used to place the filter frame 5. The inner edge of the scraper 4 is in contact with the outer wall of the filter frame 5, and is used to scrape off dirt attached to the surface of the filter frame 5 when the filter frame 5 rotates.

[0046] Reference Figure 1 and Figure 2 A clean water tank 9 is fixed to one side of the reaction tank 1 to collect the treated clean water. A pump 10 is fixed to the top of the clean water tank 9. The liquid inlet of the pump 10 is connected to the top plate 6 via a hose to extract the clean water treated by the membrane filter tubes 8. The liquid outlet of the pump 10 is connected to the clean water tank 9 via another hose to inject the extracted clean water into the clean water tank 9.

[0047] Reference Figure 1 and Figure 2 In the reaction tank 1, two scraping bars 34 are also slidably provided. Both scraping bars 34 are located above the sewage treatment structure and above the water surface, and are used to remove dirt floating on the water surface.

[0048] Reference Figure 1 、 Figure 2 、 Figure 6 、 Figure 7 and Figure 8An oxygen injection box 12 is provided on the other side of the reaction tank 1. The end of the oxygen injection box 12 away from the reaction tank 1 is connected to an external oxygen generating device through a pipeline. An oxygen injection structure is provided in the oxygen injection box 12, which includes a piston block 14 that slides in a sealed manner in the oxygen injection box 12, and a T-shaped hole 15 is provided in the piston block 14. An oxygen injection pipe 16 is fixed to the top of the oxygen injection box 12, and the top of the oxygen injection pipe 16 is fixedly connected to and connected with the bottom end of the clean water tank 9. One end of the T-shaped hole 15 can cooperate with the oxygen injection pipe 16 to inject oxygen into the clean water tank 9. At the same time, a magnet strip 19 is fixedly embedded in the top inner wall of the oxygen injection box 12, and a closing plate 17 is slidably connected to the side of the piston block 14 close to the reaction tank 1. An iron sheet layer is fixedly embedded on the top of the closing plate 17, which can generate magnetic attraction with the magnet strip 19. The closing plate 17 is used to seal the other end of the T-shaped hole 15. A stopper 18 located below the closing plate 17 is fixed to one side of the piston block 14 for supporting the closing plate 17 .

[0049] Specifically, when the piston block 14 moves to the right and one end of the T-hole 15 is connected to the oxygen injection pipe 16, oxygen is injected into the clean water tank 9 through the cooperation of the T-hole 15 and the oxygen injection pipe 16 to improve the water quality of the clean water. When the piston block 14 moves to the left, one end of the T-hole 15 is misaligned with the oxygen injection pipe 16. At this time, one end of the T-hole 15 is blocked by the inner wall of the top of the oxygen injection box 12. At the same time, the magnetic attraction generated by the magnet bar 19 on the iron layer on the top of the closing plate 17 drives the closing plate 17 to move upward, releasing the blockage on the other end of the T-hole 15. At this time, oxygen is injected into the reaction tank 1 through the cooperation of the multi-way pipe 13 and the aeration pipe 11 for sewage treatment. During the aeration process, the oxygen floats up and carries the dirt scraped by the scraper 4 to the water surface, making it easier to remove the dirt later.

[0050] Reference Figure 5-Figure 7 At the bottom of the loading plate 3, a driving structure is provided. The driving structure mainly includes a curved plate 25, which is firmly fixed to the bottom of the loading plate 3. On one side of the reaction tank 1, a chute is designed for the sliding rod 22 to slide through, ensuring that the sliding rod 22 can move smoothly along a straight line. One end of the sliding rod 22 extends into the inside of the reaction tank 1 and is fixed with a pin 24 at this end. The shape and position of the pin 24 match the curved plate 25 so that the sliding rod 22 can be driven to move when the loading plate 3 rotates. The other end of the sliding rod 22 is fixed with a U-shaped block 21. The two bottom ends of the U-shaped block 21 are both fixed with iron sheets for generating magnetic attraction with the strong magnet 20 at the top of the piston block 14. The outer wall of the sliding rod 22 is sleeved with a first spring 23 fixedly connected to the reaction tank 1. One end of the first spring 23 is fixed to the reaction tank 1, and the other end is fixedly connected to the sliding rod 22, for resetting the sliding rod 22 and the U-shaped block 21 to their initial positions when the driving structure is not working.

[0051] Specifically, when the rotating shaft 2 drives the supporting plate 3 to rotate, the arc-shaped plate 25 rotates accordingly and contacts the pin 24, pushing the pin 24 and the connected sliding rod 22 to move to the left. At this time, the magnetic attraction between the iron layer at the bottom of the U-shaped block 21 and the strong magnet 20 on the top of the piston block 14 causes the piston block 14 to also move to the left, thereby changing the relative position of the T-shaped hole 15 and the oxygen injection pipe 16, so that one end of the T-shaped hole 15 is blocked by the inner wall at the top of the oxygen injection box 12. At the same time, the magnetic attraction generated by the magnet bar 19 on the iron layer on the top of the closing plate 17 drives the closing plate 17 to move upward, releasing the blockage on the other end of the T-shaped hole 15, allowing oxygen to be injected into the reaction tank 1 through the multi-way pipe 13 and the aeration pipe 11 for sewage treatment. During the aeration process, oxygen floats up and carries the dirt scraped by the scraper 4 to the water surface, making it easier to clean later.

[0052] Reference Figure 1 、 Figure 2 、 Figure 9 and Figure 10 In order to effectively remove the dirt on the membrane filter tube 8 and collect the floating scale on the water surface, we set up a cleaning structure, and the cleaning structure includes a U-shaped frame 28 fixed on the top of the reaction tank 1, and two guide rods 35 are set in the reaction tank 1. Two scrapers 34 are respectively slidably set on the two guide rods 35, and are connected to the inner wall of the reaction tank 1 through a second spring 36 to ensure that the scraper 34 can be reset to the middle. A nut block 29 is rotatably connected in the U-shaped frame 28, and a screw 33 is passed through the internal thread of the nut block 29, and the bottom end of the screw 33 is fixedly connected to the top of the top plate 6. At the top of the U-shaped frame 28, a drive motor 31 is fixed through the frame, and its output shaft is fixed with a second bevel gear 32 that meshes with the first bevel gear 30. When the membrane filter tube 8 needs to be cleaned, the drive motor 31 is started, and the nut block 29 is driven to rotate through the meshing of the second bevel gear 32 and the first bevel gear 30, and then the top plate 6 is driven to move upward through the screw 33, and the membrane filter tube 8 and the filter frame 5 are pulled out of the reaction tank 1. Since the filter frame 5, the membrane filter tube 8 and the top plate 6 are designed to be a detachable structure, it is convenient to thoroughly clean the membrane filter tube 8 at a later stage.

[0053] Specifically, when the top plate 6 moves upward, the scraper 34 generates tension through the cooperation of the rope 38 and the guide wheel 37, causing the scraper 34 to move outward along the guide rod 35, thereby gathering the dirt floating on the water surface to one side for easy unified cleaning. When the top plate 6 moves up to near the water surface, the scraper 34 will move out from above the top plate 6 to avoid collision between the two.

[0054] Reference Figure 4 To improve the stability of the support plate 3 and scraper 4, an annular groove 39 is provided at the bottom of the top plate 6. The top ends of the two scraper 4 extend into the annular groove 39 and slide in it. This design not only increases the support area of ​​the scraper 4, but also makes the scraper 4 more stable when rotating with the support plate 3, improving the stability and durability of the overall structure.

[0055] Reference Figure 3 and Figure 9 Two connecting ears 7 are fixed on either side of the top plate 6 of the MBR membrane bioreactor. These two connecting ears 7 are designed with sliding grooves or sliding surfaces that match the inner walls of the reaction tank 1 and the U-shaped frame 28, ensuring that the top plate 6 can be smoothly raised and lowered along the inner wall of the reaction tank 1 and the U-shaped frame 28.

[0056] Reference Figure 7 To prevent the clean water in the clean water tank 9 from flowing back into the oxygen injection tank 12 and the wastewater in the reaction tank 1 from flowing back into the oxygen injection tank 12, this embodiment installs a second one-way valve 40 in the oxygen injection pipe 16 and a first one-way valve 26 in the multi-way pipe 13. The provision of the second one-way valve 40 ensures that clean water can only flow from the clean water tank 9 through the oxygen injection pipe 16 into the oxygen injection tank 12 for oxygen injection, and will not flow in the opposite direction. Similarly, the provision of the first one-way valve 26 ensures that the wastewater in the reaction tank 1 will not flow back into the oxygen injection tank 12 during treatment through the multi-way pipe 13, thereby maintaining the normal operation and stability of the system.

[0057] In summary, the MBR membrane bioreactor for deep treatment of papermaking wastewater provided in this embodiment achieves deep treatment of papermaking wastewater through ingenious structural design, and effectively removes dirt generated during the treatment process. At the same time, oxygen is alternately injected into the clean water tank 9 and the reaction tank 1, thereby improving the treatment efficiency and effect.

[0058] Example 2: Reference Figure 11 and Figure 12 , Improvement based on Example 1: In order to improve the cleaning efficiency and effect of the membrane filter tube 8, this embodiment adds a scraper 41 and related vibration mechanism in the filter frame 5.

[0059] The scraper 41 is internally designed with a plurality of first through holes 42, through which the bottom end of the membrane filter tube 8 passes. The top plate 6 drives the membrane filter tube 8 upward, and the first through holes 42 can scrape off the dirt attached to the membrane filter tube 8.

[0060] Furthermore, a fixing rod 44 is secured to the bottom of the top plate 6, with multiple hemispherical rubber blocks 45 secured to the outer wall of the fixing rod 44. A second through-hole 43 is provided within the scraper 41, matching the fixing rod 44. The diameter of the second through-hole 43 is smaller than the total distance between the hemispherical rubber blocks 45 and the fixing rod 44. Consequently, when the top plate 6 raises the fixing rod 44, the hemispherical rubber blocks 45 first enter the second through-hole 43. The difference in diameter then exerts an upward pull on the scraper 41, causing it to vibrate. This vibration helps to further shake off dirt scraped from the scraper 41.

[0061] In order to smoothly discharge the shaken dirt, a drain port 46 is provided at the bottom of the filter frame 5, and a concave disc 27 is fixed at the drain port 46. The design of the concave disc 27 can guide the dirt to flow smoothly to the drain port 46, thereby facilitating discharge.

[0062] To sum up, in this embodiment, the scraper 41 cooperates with the membrane filter tube 8 to preliminarily scrape off the dirt, and then uses the cooperation of the hemispherical rubber block 45, the fixing rod 44, and the second through hole 43 to generate vibration, so as to further shake off and discharge the scraped dirt, thereby achieving efficient automatic cleaning of the membrane filter tube 8.

[0063] The method for using an MBR membrane bioreactor for deep treatment of papermaking wastewater includes the following steps:

[0064] S1. The filtered and precipitated sewage is discharged into the reaction tank 1. The clean water treated by the membrane filter tube 8 is injected into the clean water tank 9 through the cooperation of the pump 10 and the membrane filter tube 8. After long-term use, a large amount of dirt adheres to the outer wall of the filter frame 5. At this time, the motor drives the scraper 4 to rotate through the cooperation of the rotating shaft 2 and the bearing plate 3 to remove the dirt attached to the outer wall of the filter frame 5. The removed dirt floats upward under the impact of the oxygen injected into the aeration pipe 11;

[0065] S2. When treating sewage, it is necessary to inject oxygen into the reaction tank 1. At this time, oxygen is injected into the oxygen injection box 12 through the oxygen generator. When one end of the T-shaped hole 15 is connected to the oxygen injection pipe 16, oxygen is injected into the clean water tank 9 through the cooperation of the T-shaped hole 15 and the oxygen injection pipe 16 to improve the water quality of the clean water and facilitate later use. In addition, when the rotating shaft 2 drives the bearing plate 3 to rotate, the cooperation of the arc plate 25 and the pin rod 24 drives the sliding rod 22 and the U-shaped block 21 to move to the left. The iron layer at the bottom of the U-shaped block 21 and the strong magnet 20 are connected to each other. The magnetic attraction drives the piston block 14 to move to the left, and one end of the T-shaped hole 15 is misaligned with the oxygen injection pipe 16. At this time, one end of the T-shaped hole 15 is blocked by the inner wall of the top of the oxygen injection box 12, and the magnetic attraction generated by the magnet bar 19 on the iron layer on the top of the closing plate 17 drives the closing plate 17 to move upward, releasing the blockage of the other end of the T-shaped hole 15. At this time, oxygen is injected into the reaction tank 1 through the cooperation of the multi-way pipe 13 and the aeration pipe 11 for sewage treatment. In addition, during the aeration process, the oxygen floats up and carries the dirt scraped by the scraper 4 to the water surface, making it easier to remove the dirt later.

[0066] S3. When the membrane filter tube 8 needs to be cleaned, the second bevel gear 32 is driven to rotate by the driving motor 31. The cooperation of the second bevel gear 32 and the first bevel gear 30 drives the nut block 29 to rotate. The nut block 29 cooperates with the screw 33 to drive the top plate 6 to move upward, and the membrane filter tube 8 and the filter frame 5 are pulled upward from the reaction tank 1. The filter frame 5, the membrane filter tube 8 and the top plate 6 can be removed, which is convenient for cleaning the membrane filter tube 8 in the later stage. In addition, when the top plate 6 moves upward, a pulling force is generated on the rope 38. The rope 38 pulls the scraper 34 outward, which can gather the dirt floating on the water surface to one side, which is convenient for unified cleaning in the later stage. When the top plate 6 moves upward to the water surface, the scraper 34 moves out from above the top plate 6 to avoid collision between the scraper 34 and the top plate 6.

[0067] S4. When cleaning the membrane filter tube 8, the fixation between the filter frame 5 and the top plate 6 is released. As the top plate 6 drives the membrane filter tube 8 to move upward, the first through hole 42 cooperates with the membrane filter tube 8 to preliminarily remove the dirt attached to the outer wall of the membrane filter tube 8. When the top plate 6 drives the fixing rod 44 to move upward, the cooperation between the hemispherical rubber block 45 and the fixing rod 44 can generate an upward pulling force on the scraper 41. Therefore, during the upward movement of the fixing rod 44 and the hemispherical rubber block 45, the scraper 41 is continuously vibrated, and the dirt scraped off the scraper 41 can be shaken off, and the dirt is easily discharged from the sewage outlet 46 under the action of the concave disc 27.

[0068] However, as is well known to those skilled in the art, the working principles and wiring methods of the drive motor 31 and the pump 10 are commonplace, and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art can make any selections according to their needs or convenience.

[0069] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. MBR membrane bioreactor for deep treatment of papermaking wastewater, characterized by: The invention comprises a reaction tank (1), wherein a sewage treatment structure for treating sewage is provided in the reaction tank (1), a rotating shaft (2) is rotatably connected to the inner wall of the bottom of the reaction tank (1), a supporting plate (3) for supporting the sewage treatment structure is fixed on the top of the rotating shaft (2), scrapers (4) are fixed on both sides of the top of the supporting plate (3), and the sewage treatment structure is located between the two scrapers (4), and the scrapers (4) are used to remove dirt attached to the surface of the sewage treatment structure; It also includes a clean water tank (9) fixed to one side of the reaction tank (1), a pump (10) fixed on the top of the clean water tank (9), the liquid inlet end of the pump (10) is connected to the sewage treatment structure through a hose, and the liquid outlet end of the pump (10) is connected to the clean water tank (9) through a hose, and the pump (10) is used to discharge the clean water treated by the sewage treatment structure into the clean water tank (9); It also includes two scraping bars (34), both of which are slidably arranged in the reaction tank (1), and both of which are located above the sewage treatment structure, for removing dirt floating on the water surface; An oxygen injection box (12) is provided on one side of the reaction tank (1), and one end of the oxygen injection box (12) away from the reaction tank (1) is connected to an external oxygen generating device through a pipeline; An oxygen injection structure is provided in the oxygen injection box (12) and is used to alternately inject oxygen into the reaction pool (1) and the clean water tank (9); the oxygen injection structure comprises a piston block (14) which is sealed and slides in the oxygen injection box (12), a T-shaped hole (15) is provided in the piston block (14), an oxygen injection pipe (16) is fixed on the top of the oxygen injection box (12), and the top end of the oxygen injection pipe (16) is fixedly connected to the bottom end of the clean water tank (9), and the oxygen injection pipe (16) is connected to the clean water tank (9), one end of the T-shaped hole (15) is matched with the oxygen injection pipe (16), a magnet strip (19) is fixedly embedded on the inner wall of the top of the oxygen injection box (12), and the piston block (14) is close to the reaction pool (1 ) is slidably connected to one side of the piston block (14) with a closing plate (17), and the closing plate (17) is used to block the other end of the T-shaped hole (15); a stopper (18) located below the closing plate (17) is fixed to one side of the piston block (14); the stopper (18) is used to support the closing plate (17); an iron sheet is fixedly embedded on the top of the closing plate (17); the closing plate (17) generates magnetic attraction with the magnet bar (19) through the iron sheet; a multi-way pipe (13) is fixed to one end of the oxygen injection box (12) close to the reaction tank (1); a plurality of aeration pipes (11) located below the supporting plate (3) are fixed in the reaction tank (1); the multi-way pipe (13) is connected to the plurality of aeration pipes (11); A cleaning structure is provided at the top of the reaction tank (1) and is used to drive two scraping bars (34) to move toward each other to remove dirt scraped from the outer wall of the sewage treatment structure; The driving structure is arranged at the bottom of the supporting plate (3) and is used to drive the oxygen injection structure to alternately inject oxygen into the reaction pool (1) and the clean water tank (9).

2. The MBR membrane bioreactor for advanced treatment of papermaking wastewater according to claim 1, characterized in that: The sewage treatment structure comprises a top plate (6), a filter frame (5) and a plurality of membrane filter tubes (8), wherein the plurality of membrane filter tubes (8) are detachably fixed to the bottom of the top plate (6), the filter frame (5) is detachably fixed to the bottom of the top plate (6), and the plurality of membrane filter tubes (8) are all located in the filter frame (5) for filtering sewage, the liquid inlet end of the pump (10) is connected to the top plate (6) through a hose, the filter frame (5) is placed on the top of the carrier plate (3), and two scrapers (4) are located on both sides of the filter frame (5) for scraping off dirt attached to the outer wall of the filter frame (5).

3. The MBR membrane bioreactor for advanced treatment of papermaking wastewater according to claim 2, characterized in that: The driving structure includes an arc-shaped plate (25) fixed to the bottom of the carrier plate (3), a sliding rod (22) is slidably passed through one side of the reaction pool (1), and the sliding rod (22) is located below the arc-shaped plate (25), one end of the sliding rod (22) extends into the reaction pool (1) and is fixed with a pin rod (24), the pin rod (24) cooperates with the arc-shaped plate (25), and the other end of the sliding rod (22) is fixed with a U-shaped block (21), and the U-shaped block (21) is slidably arranged on The top of the oxygen injection box (12) is fixed with iron sheets at both bottom ends of the U-shaped block (21). The outer wall of the sliding rod (22) is provided with a first spring (23) fixedly connected to the reaction pool (1). The end of the first spring (23) away from the reaction pool (1) is fixedly connected to the outer wall of the sliding rod (22). Two strong magnets (20) are fixedly embedded on the top of the piston block (14), and the U-shaped block (21) generates magnetic attraction with the two strong magnets (20) through the iron sheets.

4. The MBR membrane bioreactor for advanced treatment of papermaking wastewater according to claim 3, characterized in that: The cleaning structure includes a U-shaped frame (28) fixed on the top of the reaction pool (1), two guide rods (35) are fixed in the reaction pool (1), the two guide rods (35) are slidably passed through the two scraping strips (34), two second springs (36) are fixed on the side of the two scraping strips (34) away from each other, and the ends of the four second springs (36) away from the scraping strips (34) are respectively fixedly connected to the inner wall of one side of the corresponding reaction pool (1), and the second springs (36) are sleeved on the outer wall of the guide rod (35). The cooperation between the guide rod (35) and the second spring (36) is used to drive the scraping strip (34) to reset to the middle. A nut block (29) is rotatably connected in the U-shaped frame (28), and the inner thread of the nut block (29) passes through a screw rod (33), and the bottom end of the screw rod (33) is connected to the top of the top plate (6). The top of the nut block (29) is fixed with a first bevel gear (30), the top of the U-shaped frame (28) is fixed with a driving motor (31) through a frame, the output shaft of the driving motor (31) is fixed with a second bevel gear (32) meshed with the first bevel gear (30), and the driving motor (31) can drive the top plate (6) to rise and fall through the cooperation of the first bevel gear (30) and the second bevel gear (32), the bottom of the two scraping strips (34) are fixed with ropes (38), the bottom ends of the two ropes (38) are fixedly connected to the bottom of the top plate (6), the inner wall of the reaction pool (1) away from each other is provided with a guide wheel (37), and the guide wheel (37) is used to guide the rope (38), and the top plate (6) cooperates with the rope (38) to pull the scraping strip (34) outward.

5. The MBR membrane bioreactor for advanced treatment of papermaking wastewater according to claim 4, characterized in that: An annular groove (39) is provided at the bottom of the top plate (6), and the top ends of the two scrapers (4) extend into the annular groove (39) and are slidably engaged with the annular groove (39). The engagement of the annular groove (39) and the scrapers (4) is used to increase the stability of the carrier plate (3) and the scrapers (4).

6. The MBR membrane bioreactor for advanced treatment of papermaking wastewater according to claim 5, characterized in that: Connecting ears (7) are fixed on both sides of the top plate (6), and the sides of the two connecting ears (7) away from the top plate (6) are slidably matched with the inner wall of one side of the reaction tank (1) and the U-shaped frame (28) to ensure the smooth lifting and lowering of the top plate (6).

7. The MBR membrane bioreactor for advanced treatment of papermaking wastewater according to claim 6, characterized in that: A second one-way valve (40) is provided in the oxygen injection pipe (16) for preventing clean water in the clean water tank (9) from flowing into the oxygen injection tank (12), and a first one-way valve (26) is provided in the multi-way pipe (13) for preventing sewage in the reaction tank (1) from flowing into the oxygen injection tank (12).

8. The MBR membrane bioreactor for advanced treatment of papermaking wastewater according to claim 7, characterized in that: A scraper (41) is fixed in the filter frame (5), and a plurality of first through holes (42) are provided in the scraper (41), and the bottom end of the membrane filter tube (8) passes through the first through hole (42). The membrane filter tube (8) cooperates with the first through hole (42) to scrape off dirt attached to the outer wall of the membrane filter tube (8). A fixing rod (44) is fixed to the bottom of the top plate (6), and a plurality of hemispherical rubber blocks (45) are fixed to the outer wall of the fixing rod (44). A second through hole (43) is provided in the scraper (41), and the bottom end of the fixing rod (44) passes through the second through hole (43). The diameter of the second through hole (43) is smaller than the total distance between the hemispherical rubber block (45) and the fixing rod (44). The second through hole (43) cooperates with the fixing rod (44) and the hemispherical rubber block (45) to drive the scraper (41) to vibrate.

9. The MBR membrane bioreactor for advanced treatment of papermaking wastewater according to claim 8, characterized in that: The bottom of the filter frame (5) is provided with a sewage outlet (46), and the inner wall of the bottom of the filter frame (5) is fixed with a concave disc (27) that matches the sewage outlet (46).

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