MBR (Membrane Bioreactor) for advanced treatment of papermaking wastewater

Abstract

The invention belongs to the technical field of sewage treatment equipment, particularly relates to an MBR (Membrane Biological Reactor) for advanced treatment of papermaking wastewater, and aims to solve the problems that dirt is attached to the outer wall of the existing MBR, the dirt in a reaction tank cannot be removed, the treatment function is single, and the water quality cannot be further improved. A sewage treatment structure for treating sewage is arranged in the reaction tank, a rotating shaft is rotatably connected to the inner wall of the bottom of the reaction tank, a bearing plate for bearing the sewage treatment structure is fixed to the top of the rotating shaft, and scrapers are fixed to the two sides of the top of the bearing plate. In the sewage treatment process of the membrane filter tube, dirt attached to the outer wall of the filter frame can be removed through cooperation of the bearing plate and the scraper, meanwhile, oxygen can be alternately injected into the reaction tank and the clear water tank through rotation of the bearing plate, the water quality in the clear water tank can be improved, and sewage in the reaction tank can be conveniently treated.

Description

Technical Field

[0001] The 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] With the help of chemical flocculants, papermaking wastewater treatment equipment can reduce SS and COD in wastewater to the greatest extent. In the field of papermaking industry, this equipment is widely used to treat paper machine white water, mid-stage wastewater and deinking wastewater. On the one hand, it can effectively recycle fiber resources; on the other hand, it can also make the treated wastewater meet the reuse or discharge standards, thereby significantly reducing environmental pressure.

[0003] As a new water treatment technology, MBR membrane bioreactor combines membrane separation unit with biological treatment unit and has been widely used in sewage treatment. It replaces the secondary sedimentation tank in traditional biological treatment technology with membrane components, maintains high activated sludge concentration in the bioreactor, thereby improving the processing capacity of organic load and reducing the floor space of sewage treatment facilities. At the same time, by maintaining a low sludge load, the reactor can also effectively reduce the generation of excess sludge.

[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 lot of dirt is likely to accumulate on its outer wall. These 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 operation of the reactor to be blocked.

[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 view of 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, that is, dirt adheres 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. An 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 comprises a reaction tank, a sewage treatment structure for treating sewage is arranged in the reaction tank, a rotating shaft is rotatably connected to the inner wall of the bottom of the reaction tank, a bearing plate for bearing the sewage treatment structure is fixed on the top of the rotating shaft, scrapers are fixed on both sides of the top of the bearing 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 on one side of the reaction tank, a pump is 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 both of which are located above the sewage treatment structure, for removing dirt floating on the water surface;

[0013] An oxygen injection box is arranged 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 arranged in the oxygen injection box and is used to alternately inject oxygen into the reaction tank and the clean water tank;

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

[0016] The driving structure is arranged at the bottom of the bearing 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 a possible design, the sewage treatment structure includes a top plate, a filter frame and a plurality of membrane filter tubes, the plurality of 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 plurality of membrane filter tubes are 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 a 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 is sealed and slides in the oxygen injection box, a T-shaped hole is provided in the piston block, an oxygen injection pipe is fixed on the top of the oxygen injection box, and the top of the oxygen injection pipe is fixedly connected to the bottom end of the clean water tank, and the oxygen injection pipe is communicated with the clean water tank, one end of the T-shaped hole cooperates with the oxygen injection pipe, 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 the end of the oxygen injection box close to the reaction tank, and the reaction tank A plurality of aeration tubes located below the supporting plate are fixed in the pool, and the multi-way tube is connected with the plurality of aeration tubes; when one end of the T-hole is connected with the oxygen injection tube, oxygen is injected into the clean water tank through the cooperation of the T-hole and the oxygen injection tube 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 tube, and 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 sheet layer on the top of the closing plate drives the closing plate to move up, and releases 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 tube and the aeration tube for sewage treatment, 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 pool alternately.

[0019] In a possible design, the driving structure includes an arc-shaped plate fixed to the bottom of the carrying 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, a U-shaped block is fixed to the other end of the sliding rod, and the U-shaped block is slidably arranged on the top of the oxygen injection box, iron sheets are fixed to the two bottom ends of the U-shaped block, the outer wall of the sliding rod is sleeved 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, two strong magnets are fixedly embedded on the top of the piston block, 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, and the blockage of the other end of the T-shaped hole is released. 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, which is convenient for removing 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, the two guide rods slide through two scraping strips, two second springs are fixed on the sides of the two scraping strips away from each other, one end of the four second springs away from the scraping strips is 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, a nut block is rotatably connected in the U-shaped frame, a screw rod is penetrated by the internal thread of the nut block, and the bottom end of the screw rod is fixedly connected to the top of the top plate, 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 top plate can be driven to rise and fall, and ropes are fixed at the bottom of the two scraping strips, 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 on one side 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 to rotate by the driving motor, and the cooperation of the second bevel gear and the first bevel gear drives the nut block to rotate, and the nut block and the screw cooperate 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, the membrane filter tube and the top plate can be removed, which is convenient for cleaning the membrane filter tube in the later stage. In addition, when the top plate is moved 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, and 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 a 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 slidably cooperate 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 a possible design, connecting ears are fixed on both sides of the top plate, and the two connecting ears on the sides away from the top plate are slidably matched 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 a possible design, a scraper is fixed in the filter frame, a plurality of first through holes are arranged 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 at the bottom of the top plate, a plurality of hemispherical rubber blocks are fixed on the outer wall of the fixing rod, a second through hole is arranged 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 The hole cooperates with the fixing 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. 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. When the top plate drives the fixing rod to move upward, the cooperation between the hemispherical rubber block and the fixing rod can generate an upward pulling force on the scraper. Therefore, the scraper is continuously vibrated during the upward movement of the fixing rod and the hemispherical rubber block, thereby being able to shake off the dirt scraped off the scraper.

[0025] In a possible design, a sewage outlet is provided at the bottom of the filter frame, and a concave disc matching the sewage outlet is fixed to the inner wall of the bottom of the filter frame; the dirt scraped off the scraper disc is shaken off the scraper disc 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 bar 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 tube is fixed on the 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 tube, and during the aeration process, the oxygen floats up and carries the dirt scraped by the scraper to the water surface, so as to facilitate the later removal of the dirt, 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 bearing plate is fixed on the top of the rotating shaft, scrapers are fixed on both sides of the top of the bearing plate, and the filter frame is located between the two scrapers, and the scrapers are used to remove the dirt attached to the surface of the filter frame; the motor drives the scraper to rotate through the cooperation of the rotating shaft and the bearing 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, so that the dirt can be removed later;

[0028] In the present invention, a nut block is rotatably connected inside the U-shaped frame, a screw rod fixedly connected to the top of the top plate is penetrated by the inner thread of the nut block, ropes are fixed to the bottom of the two scraping strips, the bottom ends of the two ropes are fixedly connected to the bottom of the top plate, and 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 with 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, 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 deep treatment of papermaking wastewater provided in Example 1 of the present invention;

[0031] Figure 2 A schematic cross-sectional view of an MBR membrane bioreactor for deep 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 bearing plate of an MBR membrane bioreactor for deep 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 deep 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, an arc plate and a pin rod of an MBR membrane bioreactor for deep treatment of papermaking wastewater provided in Example 1 of the present invention;

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

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

[0037] Figure 8 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] Fig. 9 A schematic diagram of the three-dimensional structure of a U-shaped frame, a scraper bar and a top plate of an MBR membrane bioreactor for deep treatment of papermaking wastewater provided in Example 1 of the present invention;

[0039] Fig.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 deep treatment of papermaking wastewater provided in Example 1 of the present invention;

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

[0041] Fig.12 for Fig.11 Enlarged structural diagram at 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 rod; 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 described clearly and completely 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 is used in the field of sewage treatment equipment and mainly includes a reaction tank 1, which is in the shape of a rectangular parallelepiped and has a sewage treatment structure for treating sewage disposed therein. A rotating shaft 2 is rotatably connected to the inner wall of the bottom of the reaction tank 1 through a bearing. The rotating shaft 2 is vertically arranged, and a bearing plate 3 is fixedly connected to the top thereof. The bearing plate 3 is horizontally arranged and used to carry 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. The bottom of the top plate 6 is detachably fixed with a plurality of membrane filter tubes 8 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 the dirt attached to the surface of the filter frame 5 when the filter frame 5 rotates.

[0046] Reference Figure 1 and Figure 2 On one side of the reaction tank 1, a clean water tank 9 is fixed for collecting the treated clean water. A pump 10 is fixed on the top of the clean water tank 9, and the liquid inlet end of the pump 10 is connected to the top plate 6 through a hose to extract the clean water treated by the membrane filter tube 8. The liquid outlet end of the pump 10 is connected to the clean water tank 9 through 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 arranged. The two scraping bars 34 are both 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 8, an oxygen injection box 12 is arranged on the other side of the reaction tank 1, and the end of the oxygen injection box 12 away from the reaction tank 1 is connected to the external oxygen generating equipment through a pipeline. An oxygen injection structure is arranged in the oxygen injection box 12, and the oxygen injection structure includes a piston block 14 that slides in the oxygen injection box 12 in a sealed manner, and a T-shaped hole 15 is arranged 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 be matched 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 on the inner wall of the top 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, and 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 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 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 tube 16, oxygen is injected into the clean water tank 9 through the cooperation of the T-hole 15 and the oxygen injection tube 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 tube 16, and at this time, one end of the T-hole 15 is blocked by the inner wall at the top of the oxygen injection tank 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, and releases the blockage of 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 tube 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 carrier plate 3, a driving structure is provided, which mainly includes an arc plate 25, which is firmly fixed at the bottom of the carrier plate 3. On one side of the reaction pool 1, a slide groove 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 to the inside of the reaction pool 1, and a pin 24 is fixed at this end. The shape and position of the pin 24 match the arc plate 25, so that the sliding rod 22 can be driven to move when the carrier plate 3 rotates. The other end of the sliding rod 22 is fixed with a U-shaped block 21, and both bottom ends of the U-shaped block 21 are fixed with iron sheets, which are used to generate magnetic attraction with the strong magnet 20 on the top of the piston block 14. On the outer wall of the sliding rod 22, a first spring 23 fixedly connected to the reaction pool 1 is sleeved, one end of the first spring 23 is fixed to the reaction pool 1, and the other end is fixedly connected to the sliding rod 22, which is used to reset the sliding rod 22 and the U-shaped block 21 to the initial position when the driving structure is not working.

[0051] Specifically, when the rotating shaft 2 drives the bearing plate 3 to rotate, the arc plate 25 rotates accordingly and contacts the pin rod 24, pushing the pin rod 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 at the top of the piston block 14 causes the piston block 14 to 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, unblocking 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, the oxygen floats up and carries the dirt scraped by the scraper 4 to the water surface, which is convenient for later cleaning.

[0052] Reference Figure 1 , Figure 2 , Fig. 9 and Fig.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 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 rod 33 is passed through the internal thread of the nut block 29, and the bottom end of the screw rod 33 is fixedly connected to the top of the top plate 6. At the top of the U-shaped frame 28, a driving motor 31 is fixed through the frame, and its output shaft is fixed with a second bevel gear 32 meshed with the first bevel gear 30. When the membrane filter tube 8 needs to be cleaned, the driving 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 up through the screw rod 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 as a detachable structure, it is convenient to thoroughly clean the membrane filter tube 8 at a later time.

[0053] Specifically, when the top plate 6 moves upward, the scraper bar 34 generates a pulling force through the rope 38 and the guide wheel 37, so that the scraper bar 34 moves outward along the guide rod 35, and the dirt floating on the water surface is gathered to one side for unified cleaning. When the top plate 6 moves up to near the water surface, the scraper bar 34 will move out from above the top plate 6 to avoid collision between the two.

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

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

[0056] Reference Figure 7 In order to prevent the clean water in the clean water tank 9 from flowing back into the oxygen injection box 12 and the sewage in the reaction tank 1 from flowing back into the oxygen injection box 12, the second one-way valve 40 is installed in the oxygen injection pipe 16 and the first one-way valve 26 is installed in the multi-way pipe 13 in this embodiment. The setting of the second one-way valve 40 ensures that the clean water can only flow from the clean water tank 9 through the oxygen injection pipe 16 into the oxygen injection box 12 for oxygen injection operation in one direction, and will not flow in the reverse direction. Similarly, the setting of the first one-way valve 26 ensures that the sewage in the reaction tank 1 will not flow back to the oxygen injection box 12 when it is processed 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 the 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 Fig.11 and Fig.12 , improved on the basis of Example 1: In order to improve the cleaning efficiency and effect of the membrane filter tube 8, a scraper 41 and related vibration mechanisms are added to the filter frame 5 in this embodiment.

[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 to move upward, and the first through holes 42 can scrape off the dirt attached to the membrane filter tube 8.

[0060] In addition, 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 matching the fixing rod 44 is provided in the scraper 41, and 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. Thus, when the top plate 6 drives the fixing rod 44 to rise, the hemispherical rubber block 45 will first enter the second through hole 43, and then, due to the difference in diameter, an upward pulling force will be generated on the scraper 41, causing the scraper 41 to vibrate. This vibration helps to further shake off the dirt scraped off 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] In summary, in this embodiment, the scraper 41 cooperates with the membrane filter tube 8 to preliminarily scrape off the dirt, and then utilizes 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 realizing efficient automatic cleaning of the membrane filter tube 8.

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

[0064] S1. The sewage after filtration and sedimentation 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. When used for a long time, a large amount of dirt is attached 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, oxygen needs to be injected 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 for later use. In addition, when the 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-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, 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-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, which is convenient for removing 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 rod 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, release the fixation between the filter frame 5 and the top plate 6. 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 may make any optional selections according to their needs or convenience.

[0069] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. MBR membrane bioreactor for deep treatment of papermaking wastewater, characterized in that: The invention comprises a reaction tank (1), wherein a sewage treatment structure for treating sewage is arranged 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 bearing plate (3) for bearing 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 bearing 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 to the top of the clean water tank (9), a liquid inlet end of the pump (10) connected to the sewage treatment structure through a hose, and a liquid outlet end of the pump (10) connected to the clean water tank (9) through a hose, and the pump (10) is used to discharge 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, and are used to remove dirt floating on the water surface; An oxygen injection box (12) is arranged 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 arranged in the oxygen injection box (12) and is used to alternately inject oxygen into the reaction pool (1) and the clean water tank (9); A cleaning structure is arranged at the top of the reaction tank (1) and is used to drive two scraping bars (34) to move towards each other to remove dirt scraped off 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 deep 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); the plurality of membrane filter tubes (8) can be detachably fixed to the bottom of the top plate (6); the filter frame (5) can be detachably fixed to the bottom of the top plate (6); and the plurality of membrane filter tubes (8) are located in the filter frame (5) for filtering sewage; the liquid inlet end of the pump (10) is connected to the top plate (6) via 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 deep treatment of papermaking wastewater according to claim 1, characterized in that: The oxygen injection structure comprises a piston block (14) sealingly sliding in an oxygen injection box (12), a T-shaped hole (15) being provided in the piston block (14), an oxygen injection pipe (16) being fixed on the top of the oxygen injection box (12), and the top end of the oxygen injection pipe (16) being fixedly connected to the bottom end of the clean water box (9), and the oxygen injection pipe (16) being communicated with the clean water box (9), one end of the T-shaped hole (15) being matched with the oxygen injection pipe (16), a magnet bar (19) being fixedly embedded on the inner wall of the top of the oxygen injection box (12), and a sealing plate (17) being slidably connected on the side of the piston block (14) close to the reaction tank (1), and the sealing 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 on 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 on 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).

4. The MBR membrane bioreactor for deep treatment of papermaking wastewater according to claim 3, characterized in that: The driving structure comprises an arc-shaped plate (25) fixed at the bottom of the carrying plate (3); a sliding rod (22) is slidably penetrated on 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); 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), the two bottom ends of the U-shaped block (21) are fixed with iron sheets, the outer wall of the sliding rod (22) is sleeved with a first spring (23) fixedly connected to the reaction pool (1), and 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), and the top of the piston block (14) is fixedly embedded with two strong magnets (20), and the U-shaped block (21) generates magnetic attraction with the two strong magnets (20) through the iron sheet.

5. The MBR membrane bioreactor for deep treatment of papermaking wastewater according to claim 4, characterized in that: The cleaning structure comprises 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 penetrated by two scraping strips (34), two second springs (36) are fixed on the sides of the two scraping strips (34) away from each other, one end of the four second springs (36) away from the scraping strips (34) is 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 rods (35), and the cooperation between the guide rods (35) and the second springs (36) is used to drive the scraping strips (34) to reset to the middle, and a nut block (29) is rotatably connected in the U-shaped frame (28), and the inner thread of the nut block (29) penetrates 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 fixedly connected with a first bevel gear (30), the top of the U-shaped frame (28) is fixedly connected with a driving motor (31) through a frame, the output shaft of the driving motor (31) is fixedly connected with a second bevel gear (32) meshing with the first bevel gear (30), 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 first bevel gear (30), the bottom of the two scraping strips (34) are fixedly connected with a rope (38), the bottom ends of the two ropes (38) are fixedly connected with 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.

6. The MBR membrane bioreactor for deep treatment of papermaking wastewater according to claim 2, characterized in that: The bottom of the top plate (6) is provided with an annular groove (39), and the top ends of the two scrapers (4) extend into the annular groove (39) and are slidably matched with the annular groove (39). The cooperation between the annular groove (39) and the scraper (4) is used to increase the stability of the supporting plate (3) and the scraper (4).

7. The MBR membrane bioreactor for deep treatment of papermaking wastewater according to claim 2, 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 top plate (6) to be lifted and lowered smoothly.

8. The MBR membrane bioreactor for deep treatment of papermaking wastewater according to claim 3, 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).

9. The MBR membrane bioreactor for deep treatment of papermaking wastewater according to claim 2, characterized in that: A scraper (41) is fixed in the filter frame (5), 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), and 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), and the second through hole (43) cooperates with the fixing rod (44) and the hemispherical rubber block (45) to drive the scraper (41) to vibrate.

10. The MBR membrane bioreactor for deep treatment of papermaking wastewater according to claim 9, 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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