A VBBR-based nitrogen-containing wastewater treatment device and an NMP wastewater resource utilization system

Abstract

This application relates to a VBBR-based nitrogen-containing wastewater treatment device, comprising a reaction tank and a circulating water tank. The reaction tank has multiple partitions, and the circulating water tank has two vertical plates that sequentially divide it into an inlet chamber, a filtration chamber, and a return chamber. An inlet is located on one side of the inlet chamber. A filter assembly is installed in the filtration chamber. A sludge pump for supplying wastewater to the reaction tank is connected to one side of the return water chamber. The filter assembly includes a filter cylinder with a central pipe inside. One end of the central pipe passes through a vertical plate and communicates with the inlet chamber, while the other end extends into the filter cylinder. A fixed pipe is located near the end of the filter cylinder closest to the return water chamber, with one end extending into the return water chamber and the other end extending into the filter cylinder. Wastewater passes sequentially through the central pipe, the filter cylinder, and the fixed pipe. This application also relates to an NMP wastewater resource recovery system based on the VBBR-based nitrogen-containing wastewater treatment device. This application has the effect of reducing biofilm sludge loss.

Description

Technical Field

[0001] This application relates to the technical field of a nitrogen-containing wastewater treatment device, and in particular to a VBBR-based nitrogen-containing wastewater treatment device and an NMP wastewater resource utilization treatment system. Background Technology

[0002] N-Methylpyridinyl ketone (NMP) is a solvent used in the production of lithium-ion battery cathodes and PVDF adhesives for semiconductor chips. While the demand for NMP has increased annually, the treatment technology for NMP production wastewater has not kept pace. Studies have found that NMP wastewater has good biodegradability, and current anaerobic-aerobic biological treatment processes can treat it, but these still require significant energy consumption, using electron donors such as glucose, sodium acetate, methanol, or starch, increasing costs. Furthermore, the use of these biodegradable compounds also generates a certain amount of carbon emissions. The wastewater from the NMP production industry (product distillation wastewater) has a high total nitrogen content (600-1000 mg / L), with NMP as the main organic impurity. Using NMP distillation residue as an electron donor in denitrification processes has significant theoretical and practical implications.

[0003] A related technology discloses an aerobic and anaerobic VBBR series coupling device. VBBR refers to a Vertical Baffled Bioreactor, which includes a reaction tank and a circulating water tank arranged vertically. Inside the reaction tank, there are horizontal, multi-layered baffles arranged alternately. The baffles have polyhedral hollow spheres on them to support biofilm sludge. The baffles form channels for the solution to flow through. A submersible pump is connected to the circulating water tank, with its outlet connected to the inlet of the reaction tank. This allows the pump to deliver wastewater into the reaction tank, where it flows along the channels, removing nitrogen from the wastewater through the biofilm. The circulating water tank has an inlet for wastewater inflow and an outlet for treated clean water outflow.

[0004] However, in the above structure, when wastewater passes through the channel, the turbulence of the wastewater can easily wash away the sludge of the biofilm, causing the biofilm sludge to flow out from the outlet, thus resulting in sludge loss. Summary of the Invention

[0005] To reduce the loss of biofilm sludge, this application provides a VBBR-based nitrogen-containing wastewater treatment device and an NMP wastewater resource utilization treatment system.

[0006] This application provides a nitrogen-containing wastewater treatment device based on VBBR, which adopts the following technical solution: A VBBR-based nitrogen-containing wastewater treatment device includes a reaction tank and a circulating water tank. The reaction tank has multiple partitions, and the circulating water tank has two vertical plates that sequentially divide it into an inlet chamber, a filtration chamber, and a return chamber. An inlet is located on one side of the inlet chamber. A filter assembly is installed in the filtration chamber. A slurry pump for supplying wastewater to the reaction tank is connected to one side of the return water tank. The filter assembly includes a filter cylinder with a central pipe inside. One end of the central pipe passes through a vertical plate and communicates with the inlet chamber, while the other end extends into the filter cylinder. A fixed pipe is located near the return water chamber at one end of the filter cylinder, with one end extending into the return water chamber and the other end extending into the filter cylinder. Wastewater passes sequentially through the central pipe, the filter cylinder, and the fixed pipe.

[0007] By adopting the above technical solution, during use, the circulating water tank is divided into an inlet chamber, a filtration chamber, and a return chamber by a vertical plate. When wastewater and water circulating from the reaction tank enter the inlet chamber, the wastewater first enters the central pipe and then the filter cylinder because one end of the central pipe is connected to the inlet chamber. This allows the biologically activated sludge in the wastewater to enter the fixed pipe through the filter cylinder, where it is blocked by the filter cylinder. The wastewater that needs to flow to the next stage enters the filtration chamber after being filtered by the filter cylinder. The wastewater in the filter cylinder, carrying biologically activated sludge, enters the fixed pipe along with the wastewater and then flows back to the return chamber through the fixed pipe. This allows the slurry pump to send the biologically activated sludge into the reaction tank. Using a slurry pump can reduce damage during wastewater pumping. The wastewater flowing in the reaction tank, carrying a large amount of biologically activated sludge, can be enriched again on the baffle plate, thereby reducing the loss of biofilm sludge.

[0008] Preferably, the central tube is rotatably connected to the vertical plate, the central tube is connected to a drive assembly, the central tube is coaxially arranged with the filter cylinder, multiple blades are fixedly arranged on the side wall of the central tube inside the filter cylinder, and multiple through holes are opened on the side wall of the central tube along the length direction of the central tube.

[0009] By adopting the above technical solution, the central tube rotates under the action of the drive component, and at the same time, multiple blades are fixed on the side wall of the filter cylinder. When the blades rotate with the central tube, they can drive the wastewater located between the filter cylinder and the central tube to rotate, so that the wastewater can have a better filtration effect under the action of centrifugal force.

[0010] Preferably, the fixed pipe is fixedly connected to the circulating water tank, and a return water hole for connecting the filter cylinder is opened on the side wall of one end of the fixed pipe inside the filter cylinder. The filter cylinder is rotatably connected to the fixed pipe and the central pipe. A brush fixed to the fixed pipe is provided inside the filter cylinder, and the brush is used to clean the inner wall of the filter cylinder.

[0011] By adopting the above technical solution, the fixed pipe is fixed to the circulating water tank, and the filter cylinder is rotatably connected to the fixed pipe. Thus, after the brush set inside the filter cylinder is fixed to the fixed pipe, the rotation of the filter cylinder can move relative to the brush. In this way, the brush can clean the inner side of the filter cylinder. At the same time, the rotation of the filter cylinder can also reduce the sedimentation of sludge with biofilm inside the filter cylinder, allowing the sludge to flow towards the baffle and accumulate on the baffle.

[0012] Preferably, a transmission assembly is provided between the filter cartridge and the central tube. The transmission assembly includes a sun gear, planet gears and a gear ring. The gear ring is coaxially fixed to the end of the filter cartridge, the sun gear is coaxially fixed to the central tube, and the planet gears are rotatably connected to the vertical plate. The planet gears mesh externally with the sun gear and internally with the gear ring.

[0013] By adopting the above technical solution, the transmission component includes a sun gear, planet gears, and a gear ring. Under the drive of the drive component, the gear ring also rotates under the action of the planet gears. At the same time, the deceleration effect of the planet gears reduces the rotational speed of the gear ring. The gear ring is fixed on the filter cylinder, driving the rotation of the filter cylinder. This reduces energy consumption when the filter cylinder rotates at a low speed. It also facilitates the simultaneous driving of the central tube and the filter cylinder in opposite directions, improving the flushing of the filter cylinder's inner wall by wastewater and further reducing the adhesion of sludge to the filter cylinder.

[0014] Preferably, at least two filter components are arranged in the same filter chamber. The drive component includes a motor, a drive pulley, and a driven pulley. The motor is fixed on the vertical plate, and the output shaft of the motor is coaxially fixed with the drive pulley. A driven pulley is coaxially fixed on the central tube of the filter component, and a belt is provided between the drive pulley and the driven pulley.

[0015] By adopting the above technical solution, the motor drives the active pulley to rotate, and the active pulley then drives multiple driven pulleys through the belt, thereby enabling multiple filter components to work simultaneously and improving the working efficiency of the filter components in the filter chamber.

[0016] Preferably, the partition is D-shaped, with its arc-shaped edge connected to the inner wall of the reaction chamber. An overflow plate is provided at the straight edge of the partition, located on the upper surface of the partition. A water channel is provided below the overflow plate and on the partition. The bottom surface of the water channel is arc-shaped, with one end extending horizontally from the straight edge of the partition and the other end extending obliquely upward from the upper surface of the partition.

[0017] By adopting the above technical solution, the baffle is D-shaped, so that the water between two adjacent baffles flows through the straight edge of the baffle. At the same time, part of the wastewater passes through the upper surface of the overflow plate, and the other part passes through the water flow channel below the overflow plate. The arc-shaped water flow channel can form a water flow direction that impacts and cancels the water flow formed on the overflow plate, thereby reducing the biofilm sludge stripping caused by excessive water flow velocity at the baffle position.

[0018] Preferably, the height between two adjacent partitions is D (m), the height of the overflow plate is d (m), the water flow velocity into the reaction tank is Q (m³ / s), the radius of the bottom surface of the water flow channel is R (m), the upward tilt angle of the water flow channel at the upward end is α, the density of the wastewater is ρ (kg / m³), and d = D(QR / 2ρ). 0.75 tan(α), and the ratio of d to D is between 0.5 and 0.7.

[0019] By adopting the above technical solution, the flow rate of wastewater can be limited to a suitable range based on the height between two adjacent baffles, thereby reducing the damage of wastewater to biofilm sludge.

[0020] Preferably, the filter chamber is connected to a pump for adjusting the liquid level inside the filter chamber.

[0021] By adopting the above technical solution, the filter chamber is connected to a pump for adjusting the liquid level in the filter chamber, so that the liquid level in the filter chamber can be adjusted. At this time, the liquid level in the filter chamber submerges the filter cylinder to different depths, so that the amount of wastewater flowing out after filtration in the filter cylinder can be controlled. On the one hand, it reduces the sludge from adhering to the inner wall of the filter cylinder, and on the other hand, it can control the amount of water in each cycle.

[0022] This application also provides a resource recovery system for NMP wastewater based on a VBBR nitrogen-containing wastewater treatment device, which adopts the following technical solution: A NMP wastewater resource recovery system based on a VBBR nitrogen-containing wastewater treatment device includes an anaerobic reaction section and an aerobic reaction section. Each of the anaerobic and aerobic reaction sections contains a wastewater treatment device. The filtration chamber of the circulating water tank in the anaerobic reaction section has an outlet at its lower part. A connecting pipe connects the outlet to the inlet of the circulating water tank in the aerobic reaction section, and a power pump is installed on the connecting pipe. A circulating water pipe connects the anaerobic and aerobic reaction sections, and a circulating pump is installed on the circulating water pipe. One end of the circulating water pipe is connected to the bottom of the filtration chamber in the aerobic reaction section, and the other end is connected to the inlet chamber in the anaerobic reaction section.

[0023] By adopting the above technical solution, a wastewater treatment device is installed in both the anaerobic and aerobic reaction sections, so that the corresponding biological activated sludge in each of the two circulating water tanks can be screened. This reduces the loss of biological activated sludge caused by mutual flow between the anaerobic and aerobic reaction sections, thus ensuring efficient biological treatment of wastewater during the repeated circulation between the aerobic and anaerobic reaction sections.

[0024] Preferably, in the anaerobic reaction section, the outlet of the mud pump is connected to the bottom of the reaction tank and the interior of the reaction tank. An anaerobic return water pipe is connected to the upper side wall of the reaction tank in the anaerobic reaction section, and the end of the anaerobic return water pipe away from the reaction section is connected to the water inlet chamber of the reaction tank in the anaerobic reaction section. In the aerobic reaction section, the outlet of the mud pump is connected to the top side wall of the reaction tank and the bottom of the reaction tank in the aerobic reaction section is connected to an aerobic return water pipe. The aerobic return water pipe is configured with a U-shaped structure. One end of the aerobic return water pipe is connected to the bottom of the corresponding reaction tank, and the other end is connected to the water inlet chamber of the reaction tank in the aerobic reaction section. The middle part of the aerobic return water pipe extends upward to the top of the reaction tank.

[0025] By adopting the above technical solution, an anaerobic return water pipe is connected to the reaction tank in the anaerobic reaction section, and the anaerobic return water pipe is connected to the water inlet chamber of the reaction tank in the anaerobic reaction section, so that the wastewater in the anaerobic return water pipe is first mixed with the water in the water inlet pipe, so that the newly added wastewater can adapt to the original environment in the reaction tank.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By blocking the flow of wastewater in the filter cartridge, the wastewater containing biologically active sludge enters the fixed pipe along with the wastewater and then flows back to the return water chamber through the fixed pipe. The wastewater flowing in the reaction tank contains a large amount of biologically active sludge, which can be enriched on the baffle plate again, thereby reducing the loss of biofilm sludge. 2. By fixing the brush inside the filter cartridge to the fixed tube, the rotation of the filter cartridge can move relative to the brush, so that the brush can clean the inner side of the filter cartridge. At the same time, the rotation of the filter cartridge can also reduce the sedimentation of biofilm-containing sludge inside the filter cartridge. 3. By having part of the wastewater pass over the upper surface of the overflow plate and the other part pass through the water flow channel below the overflow plate, the arc-shaped water flow channel can create a situation where the water flow direction and the water flow formed on the overflow plate can impact and cancel each other out, thereby reducing the biofilm sludge stripping caused by excessive water flow velocity at the baffle plate location. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2This is a schematic diagram of the connection structure of the two circulating water tanks in an embodiment of this application; Figure 3 yes Figure 2 A magnified view of part A in the middle; Figure 4 This is a schematic diagram of the installation of the drive component and the transmission component in the embodiments of this application; Figure 5 This is a schematic diagram showing the position of the brush in an embodiment of this application; Figure 6 This is a schematic diagram showing the relative positions of the two partitions in an embodiment of this application.

[0028] Explanation of reference numerals in the attached diagram: 1. Anaerobic reaction section; 11. Anaerobic return water pipe; 12. Outlet; 2. Aerobic reaction section; 21. Aerobic return water pipe; 22. Aerator; 3. Wastewater treatment device; 31. Reaction tank; 32. Circulating water tank; 321. Inlet chamber; 322. Filter chamber; 323. Return water chamber; 34. Vertical plate; 35. Inlet; 36. Slurry pump; 37. Pump foot valve; 38. Sludge discharge valve; 4. Filter assembly; 41. Filter cylinder; 42. Central pipe; 421. Through hole; 43. Blade; 44. Fixed pipe; 441. Return water hole; 51. Connecting pipe; 52. Power pump; 53. Circulating water pipe; 54. Circulating pump; 55. Drain pipe; 56. Solenoid valve; 6. Drive assembly; 61. Motor; 62. Drive pulley; 63. Driven pulley; 64. Belt; 7. Brush; 71. Support frame; 72. Brush bristles; 73. Support ring; 8. Transmission assembly; 81. Sun gear; 82. Planetary gears; 83. Gear ring; 84. Fixed shaft; 9. Baffle plate; 91. Overflow plate; 92. Water flow channel. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0030] This application discloses an NMP wastewater resource utilization system based on a VBBR nitrogen-containing wastewater treatment device.

[0031] Example 1: This embodiment discloses a NMP wastewater resource recovery treatment system based on a VBBR nitrogen-containing wastewater treatment device, referencing... Figure 1 and Figure 2The system includes an anaerobic reaction section 1 and an aerobic reaction section 2. Each section contains a wastewater treatment device 3, which includes a reaction tank 31 and a circulating water tank 32. The reaction tank 31 is fixed above the circulating water tank 32, allowing wastewater from the circulating water tank 32 to enter the reaction tank 31. The treated wastewater from the reaction tank 31 then flows back to the circulating water tank 32. The circulating water tank 32 has two vertical plates 34 arranged sequentially, dividing it into three chambers: an inlet chamber 321, a filter chamber 322, and a return chamber 323. A sludge discharge valve 38 is connected to the bottom of each chamber, allowing for periodic cleaning of sludge. An inlet 35 is located on one side of the inlet chamber 321. When wastewater enters the inlet chamber 321, it flows into the filter chamber 322. The filter chamber 322 is equipped with a filter assembly 4, which retains the sludge from the wastewater within itself. The wastewater containing sludge then flows into the return chamber 323. A sludge pump 36 is installed outside the circulating water tank 32. The inlet of the sludge pump 36 extends into the return chamber 323 and is equipped with a bottom valve 37, allowing the sludge pump 36 to pump the sludge-containing wastewater out of the return chamber 323. The outlet of the sludge pump 36 is connected to the reaction tank 31, allowing the wastewater pumped from the return chamber 323 to flow back into the reaction tank 31, increasing the concentration of sludge in the wastewater and reducing the direct outflow of biofilm sludge from the circulating water tank 32.

[0032] refer to Figure 1 and Figure 2The outlet of the mud pump 36 in the anaerobic reaction section 1 is connected to the bottom side wall of the reaction tank 31. At the same time, an anaerobic return water pipe 11 is connected to the upper side wall of the reaction tank 31 in the anaerobic reaction section 1. The anaerobic return water pipe 11 is directed downward into the circulating water tank 32 in the anaerobic reaction section 1 and is located in the inlet chamber 321 of the circulating water tank 32. This allows the treated water returned by the anaerobic return water pipe 11 to flow into the filter chamber 322 through the interaction with the filter assembly 4. An outlet 12 is provided on the circulating water tank 32 in the anaerobic reaction section 1 and is located at the lower part of the circulating water tank 32, which is connected to the filter chamber 322. The outlet 12 can be opened on the vertical plate 34 between the filter chamber 322 and the return water chamber 323. A connecting pipe 51 is provided between the inlet 35 of the circulating water tank 32 in the aerobic reaction section 2 and the outlet 12 of the circulating water tank 32 in the anaerobic reaction section 1. A power pump 52 is installed on the connecting pipe 51. The power pump 52 pumps the water in the connecting pipe 51 from the anaerobic reaction section 1 to the aerobic reaction section. Since the wastewater in the anaerobic reaction section 1 is filtered by the filter component 4 in the filter chamber 322 when the power pump 52 pumps it, the sludge content in the wastewater flowing into the aerobic reaction section 2 is relatively small. At the same time, the power pump 52 can control the liquid level in the filter chamber 322. In the aerobic reaction section 2, the outlet of the mud pump 36 connected to the circulating water tank 32 communicates with the top side wall of the reaction tank 31. An aerobic return water pipe 21 is connected to the aerobic reaction section 2. The aerobic return water pipe 21 is U-shaped. One end of the aerobic return water pipe 21 is connected to the bottom of the reaction tank 31, and the other end is connected to the circulating water tank 32 in the aerobic reaction section 2 and located in the inlet chamber 321. The middle part of the U-shaped structure of the aerobic return water pipe 21 extends upward to the top of the reaction tank 31. An aerator 22 is installed in the reaction tank 31 in the aerobic reaction section 2. The aerator 22 is used to dissolve oxygen in the wastewater. Excess oxygen generated by the aerator 22 can be released by connecting an air release valve to the top of the reaction tank 31.A circulating water pipe 53 is installed between the anaerobic reaction section 1 and the aerobic reaction section 2. One end of the circulating water pipe 53 is connected to the circulating water tank 32 of the aerobic reaction section 2, and the other end is connected to the circulating water tank 32 of the anaerobic reaction section 1. A circulating pump 54 is installed on the circulating water pipe 53. The function of the circulating pump 54 is to transport the water in the circulating water pipe 53 from the aerobic reaction section 2 to the anaerobic reaction section 1. The connection position of the circulating water pipe 53 to the circulating water tank 32 in the aerobic reaction section 2 corresponds to the bottom of the filter chamber 322. The connection position of the circulating water pipe 53 to the circulating water tank 32 in the anaerobic reaction section 1 corresponds to the inlet chamber 3. 21. Water treated in the aerobic reaction section 2 is reintroduced into the anaerobic reaction section 1 for further biological reaction, thereby reducing the nitrogen content in the wastewater. Simultaneously, the circulating pump 54 adjusts the liquid level in the filter chamber 322 of the aerobic reaction section 2. A drain pipe 55 is connected to one end of the circulating water pipe 53 near the anaerobic reaction section 1. A solenoid valve 56 is installed on the drain pipe 55 to control the flow rate of the drain pipe 55. Thus, a portion of the water flowing out of the circulating water pipe 53 is discharged through the drain pipe 55, and the amount of water returning to the anaerobic reaction section 1 from the circulating water pipe 53 is 60%-80% of the total volume of the circulating water pipe 53. Although the circulating water pipe 53 connects the aerobic reaction section 2 and the anaerobic reaction section 1, the filter assembly 4 effectively separates the activated sludge in the two sections, reducing the loss of activated sludge activity due to the circulating water pipe 53.

[0033] refer to Figure 3 and Figure 4The filter assembly 4 includes a filter cylinder 41, which can be a double-layer structure with an outer steel mesh frame and an inner nylon filter screen. The filter cylinder 41 is cylindrical in shape, with its center line horizontally positioned. One end of the filter cylinder 41 faces the inlet chamber 321, and the other end faces the return chamber 323. A central tube 42 is inserted through the center of the filter cylinder 41. One end of the central tube 42 is inserted into the interior of the filter cylinder 41, and the other end is rotatably connected to the vertical plate 34 and penetrates the vertical plate 34 into the inlet chamber 321, allowing water in the inlet chamber 321 to enter the interior of the filter cylinder 41 through the central tube 42. Multiple through holes 421 are provided on the side wall of the central tube 42 and inside the filter cylinder 41. The through holes 421 are used to allow water in the central tube 42 to flow towards the inside of the filter cylinder 41. The central tube 42 is rotatably connected to the vertical plate 34 and is connected to a drive assembly 6. A blade 43 is installed in the portion of the central tube 42 located inside the filter cylinder 41. The blade 43 can be plate-shaped or spiral-shaped. The spiral-shaped blade 43 can transport wastewater containing sludge. The blade 43 is fixed on the central tube 42, and multiple blades 43 are evenly arranged along the circumference of the central tube 42. When the central tube 42 rotates, it can drive the blade 43 to rotate. In this embodiment, the blade 43 is arranged parallel to the center line of the central tube 42, so that the blade 43 can drive the wastewater in the filter cylinder 41 to rotate. During the rotation of the wastewater, it can be filtered under the action of the filter cylinder 41. At the same time, the filtration effect of the filter cylinder 41 can be adjusted in conjunction with the water level in the filter chamber 322. That is, when there is more water in the filter chamber 322, less water flows out from the wall of the filter cylinder 41, and when there is less water in the filter chamber 322, more water flows out from the wall of the filter cylinder 41, thereby adjusting the amount of return water required in the reaction tank 31.

[0034] refer to Figure 3 A fixed pipe 44 is provided at one end of the filter cylinder 41 near the return water chamber 323. The center line of the fixed pipe 44 is collinear with the center line of the central pipe 42. One end of the fixed pipe 44 is fixed to the vertical plate 34 and passes through the vertical plate 34 to communicate with one side of the return water chamber 323. The other end is inserted into the interior of the filter cylinder 41. A return water hole 441 is provided on the side wall of the fixed pipe 44 located inside the filter cylinder 41. The return water hole 441 allows wastewater mixed with sludge inside the filter cylinder 41 to flow into the filter cylinder 41. The filter cartridge 41 enters the return water chamber 323 through the fixed pipe 44, thereby reducing the amount of sludge flowing out of the circulating water pipe 53. The end of the central pipe 42 close to the fixed pipe 44 is rotatably connected to the fixed pipe 44, so that the central pipe 42 and the fixed pipe 44 jointly support the filter cartridge 41. The filter cartridge 41 is rotatably connected to the fixed pipe 44 and the central pipe 42, so that the inner wall of the filter cartridge 41 can be filtered, resulting in a better filtration effect on wastewater and reducing clogging.

[0035] refer to Figure 5 A brush 7 is installed inside the filter cylinder 41. The brush 7 includes a support frame 71 and bristles 72. The support frame 71 is set parallel to the axis of the filter cylinder 41 in the gap between the blade 43 and the inner wall of the filter cylinder 41. The bristles 72 are arranged along the length of the support frame 71 and abut against the inner wall of the filter cylinder 41. One end of the support frame 71 near the fixed pipe 44 is fixed to the fixed pipe 44, and the other end is provided with a support ring 73. The support ring 73 is rotatably connected to the inner wall of the filter cylinder 41. Multiple support frames 71 are evenly arranged along the periphery of the filter cylinder 41, so that the filter cylinder 41 can move relative to the brush 7 when it rotates. This facilitates the brush 7 to clean the sludge adhering to the inner wall of the filter cylinder 41, so that the sludge enters the wastewater and continues to flow into the return water chamber 323 with the wastewater, thereby improving the filtration stability of the filter cylinder 41 and reducing the loss of sludge due to adhesion.

[0036] refer to Figure 4 The drive assembly 6 includes a motor 61, a drive pulley 62, and a driven pulley 63. Two or more filter components 4 can be set in the same filter chamber 322. A driven pulley 63 is coaxially fixed at the same end of the central tube 42 in each filter component 4. The motor 61 is fixed on a vertical plate 34. The drive pulley 62 is coaxially fixed on the output shaft of the motor 61. A belt 64 is set between the drive pulley 62 and the driven pulley 63, so that the motor 61 can drive the central tube 42 of multiple filter components 4 to rotate at the same time, thereby increasing the water flow rate through multiple filter components 4 in the filter chamber 322.

[0037] refer to Figure 4 A transmission assembly 8 is provided between the filter cartridge 41 and the central tube 42. The transmission assembly 8 includes a sun gear 81, planet gears 82, and a gear ring 83. The planet gears 82 are rotatably connected to the vertical plate 34 via a fixed shaft 84, and the fixed shaft 84 is fixedly connected to the vertical plate 34. The sun gear 81 is coaxially fixed to the central tube 42. The gear ring 83 is coaxially arranged with the sun gear 81 and fixed to the outer wall of the end of the filter cartridge 41. The planet gears 82 and the gear ring 83 are internally meshed, and the planet gears 82 and the sun gear 81 are externally meshed. When the sun gear 81 and the central tube 42 rotate simultaneously, the sun gear 81 drives the gear ring 83 to rotate in the opposite direction through the planet gears 82. Due to the action of the transmission assembly 8, the rotational speed from the sun gear 81 to the gear ring 83 is reduced, allowing the filter cartridge 41 to rotate at a lower speed, reducing energy consumption. Meanwhile, the central tube 42 can drive the wastewater to rotate at a higher speed, allowing the wastewater to collide with the filter cartridge 41 under the action of centrifugal force for filtration.

[0038] refer to Figure 1 and Figure 6The reaction chamber 31 is equipped with baffles 9, which are D-shaped and staggered. The arc-shaped edges of the baffles 9 are sealed and fixed to the inner wall of the reaction chamber 31, and can be connected by welding. Multiple baffles 9 are arranged at equal intervals along the height of the reaction chamber 31, so that wastewater can flow through the gap between two baffles 9 and then flow to the next baffle 9 from the straight edge of the baffle 9. Since the wastewater turns at the straight edge of the baffle 9, it is easy to form eddies. The eddy wastewater can easily roll up the biological activated sludge on the baffle 9. Therefore, in order to reduce the eddy state of the wastewater at the straight edge of the baffle 9, an overflow plate 91 is set along the straight edge of the baffle 9. The overflow plate 91 is set vertically, and a water flow channel 92 is opened on the baffle 9 below the overflow plate 91. One end of the water flow channel 92 is set horizontally, the bottom surface of the water flow channel 92 is arc-shaped, one end extends horizontally from the edge of the baffle 9, and the other end extends obliquely upward from the surface of the baffle 9. In the anaerobic reaction section 1, wastewater flows along the straight edge of the baffle 9. A portion of the wastewater overflows from above the overflow plate 91 and forms a rotating vortex at the overflow plate 91. Simultaneously, another portion of the wastewater forms a vortex with the opposite rotation direction from the water flow channel 92. These two vortices cancel each other out, reducing the impact on the biologically activated sludge on the baffle 9. In the aerobic reaction section 2, a portion of the wastewater flows downwards from above the overflow plate 91, forming a vortex, while another portion flows through the water flow channel 92, forming a vortex with the opposite rotation direction. This further reduces the energy of the water flow in the gap between the straight edge of the baffle 9 and the reaction tank 31. Example

[0039] This embodiment discloses an NMP wastewater resource recovery system based on a VBBR nitrogen-containing wastewater treatment device. The difference from Embodiment 1 is that: the height between two adjacent partitions 9 is D (m), the height of the overflow plate 91 is d (m), the water flow velocity into the reaction tank 31 is Q (m³ / s), the radius of the bottom surface of the water flow channel 92 is R (m), the upward tilt angle of the water flow channel 92 at the upward end is α, and the density of the wastewater is ρ (kg / m³). d = D(QR / 2ρ)^ 0.75 If tan(α) is used and the ratio of d to D is between 0.5 and 0.7, the sludge loss rate can be reduced to below 10%.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A nitrogen-containing wastewater treatment device based on VBBR, comprising a reaction tank (31) and a circulating water tank (32), wherein the reaction tank (31) is provided with a plurality of partitions (9), characterized in that: The circulating water tank (32) is provided with two vertical plates (34), which divide the circulating water tank (32) into an inlet chamber (321), a filter chamber (322), and a return water chamber (323) in sequence. An inlet (35) is provided on one side of the inlet chamber (321). A filter assembly (4) is provided in the filter chamber (322). A mud pump (36) for conveying wastewater into the reaction tank (31) is connected to one side of the return water chamber (323). The filter assembly (4) includes a filter cylinder. (41) A central tube (42) is provided inside the filter cylinder (41). One end of the central tube (42) passes through a vertical plate (34) and communicates with the water inlet chamber (321), and the other end is connected to the filter cylinder (41). A fixed tube (44) is provided at one end of the filter cylinder (41) near the water return chamber (323). One end of the fixed tube (44) is connected to the water return chamber (323), and the other end is connected to the filter cylinder (41). Wastewater flows through the central tube (42), the filter cylinder (41), and the fixed tube (44) in sequence. The central tube (42) is rotatably connected to the vertical plate (34). The central tube (42) is connected to the drive assembly (6). The central tube (42) is coaxially arranged with the filter cylinder (41). Multiple blades (43) are fixedly arranged on the side wall of the central tube (42) inside the filter cylinder (41). Multiple through holes (421) are opened on the side wall of the central tube (42) along the length direction of the central tube (42). The fixed tube (44) is fixedly connected to the circulating water tank (32). A return water hole (441) for connecting the filter cylinder (41) is opened on the side wall of the fixed tube (44) at one end inside the filter cylinder (41). The filter cylinder (41) is rotatably connected to the fixed tube (44) and the central tube (42). A brush (7) fixed to the fixed tube (44) is arranged inside the filter cylinder (41). The brush (7) is used to clean the inner wall of the filter cylinder (41). The partition (9) is D-shaped in general. The arc edge of the partition (9) is connected to the inner wall of the reaction tank (31). An overflow plate (91) is provided at the straight edge of the partition (9). The overflow plate (91) is located on the upper surface of the partition (9). A water flow channel (92) is provided below the overflow plate (91) and on the partition (9). The bottom surface of the water flow channel (92) is arc-shaped and one end extends horizontally from the straight edge of the partition (9), while the other end extends upwardly along the upper surface of the partition (9).

2. The nitrogen-containing wastewater treatment device based on VBBR according to claim 1, characterized in that: A transmission assembly (8) is provided between the filter cylinder (41) and the central tube (42). The transmission assembly (8) includes a sun gear (81), planet gears (82) and a gear ring (83). The gear ring (83) is coaxially fixed to the end of the filter cylinder (41). The sun gear (81) is coaxially fixed to the central tube (42). The planet gears (82) are rotatably connected to the vertical plate (34). The planet gears (82) mesh externally with the sun gear (81) and internally with the gear ring (83).

3. The nitrogen-containing wastewater treatment device based on VBBR according to claim 1, characterized in that: At least two filter components (4) are located in the same filter chamber (322). The drive component (6) includes a motor (61), a drive pulley (62), and a driven pulley (63). The motor (61) is fixed on the vertical plate (34). The output shaft of the motor (61) is coaxially fixed with the drive pulley (62). A driven pulley (63) is coaxially fixed on the central tube (42) of the filter component (4). A belt (64) is provided between the drive pulley (62) and the driven pulley (63).

4. The nitrogen-containing wastewater treatment device based on VBBR according to claim 1, characterized in that: The height between two adjacent partitions (9) is D, in meters; the height of the overflow plate (91) is d, in meters; the water flow velocity into the reaction tank (31) is Q, in cubic meters per second; the radius of the bottom surface of the water flow channel (92) is R, in meters; the upward tilt angle of the water flow channel (92) at the upward end is α; the density of the wastewater is ρ, in kilograms per cubic meter; d = D(QR / 2ρ)^0.75tan(α); and the ratio of d to D is between 0.5 and 0.

7.

5. The nitrogen-containing wastewater treatment device based on VBBR according to claim 1, characterized in that: The filter chamber (322) is connected to a pump for adjusting the liquid level inside the filter chamber (322).

6. A resource-based treatment system for NMP wastewater based on a VBBR nitrogen-containing wastewater treatment device, comprising at least two VBBR-based nitrogen-containing wastewater treatment devices as described in any one of claims 1-5, characterized in that: It also includes an anaerobic reaction section (1) and an aerobic reaction section (2). Each of the anaerobic reaction section (1) and the aerobic reaction section (2) has a VBBR-based nitrogen wastewater treatment device. The filter chamber (322) of the circulating water tank (32) in the anaerobic reaction section (1) has an outlet (12) at the bottom. The outlet (12) is connected to the inlet (35) of the circulating water tank (32) in the aerobic reaction section (2) by a connecting pipe (51). A power pump (52) is installed on the connecting pipe (51). A circulating water pipe (53) is installed between the anaerobic reaction section (1) and the aerobic reaction section (2). A circulating pump (54) is installed on the circulating water pipe (53). One end of the circulating water pipe (53) is connected to the bottom of the filter chamber (322) in the aerobic reaction section (2), and the other end is connected to the inlet chamber (321) in the anaerobic reaction section (1).

7. The NMP wastewater resource utilization system based on a VBBR nitrogen-containing wastewater treatment device according to claim 6, characterized in that: The outlet of the mud pump (36) in the anaerobic reaction section (1) is connected to the bottom of the reaction tank (31) and the inside of the reaction tank (31). An anaerobic return water pipe (11) is connected to the upper side wall of the reaction tank (31) in the anaerobic reaction section (1). The end of the anaerobic return water pipe (11) away from the anaerobic reaction section (1) is connected to the inlet chamber (321) of the circulating water tank (32) in the anaerobic reaction section (1). The outlet of the mud pump (36) in the aerobic reaction section (2) is connected to the bottom of the reaction tank (31) and the inside of the reaction tank (31). The top sidewall of the aerobic reaction section (2) is connected to the reaction tank (31). The bottom of the reaction tank (31) in the aerobic reaction section (2) is connected to an aerobic return water pipe (21). The aerobic return water pipe (21) is set in a U-shaped structure. One end of the aerobic return water pipe (21) is connected to the bottom of the corresponding reaction tank (31), and the other end is connected to the inlet chamber (321) of the circulating water tank (32) in the aerobic reaction section (2). The middle part of the aerobic return water pipe (21) extends upward to the top of the reaction tank (31).

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