Vertical denitrification sewage treatment device

Abstract

The present application relates to a vertical denitrification sewage treatment device, belonging to the technical field of sewage treatment, which is sequentially connected from top to bottom through an upper horizontal plate, a middle vertical plate and a third inclined plate, the upper horizontal plate is sealingly connected with the pool wall of a sewage pool to form a closed air chamber for improving the mud-water separation efficiency, the middle vertical plate and the inclined pipe form a mud-water separation part for ensuring the uniform distribution of the mud-water mixture, the water distribution area below the third inclined plate is provided with an inclined bending plate, the lower part of the mud-water separation outer box body is provided with a fourth inclined plate, the third inclined plate and the bending plate jointly form a first sedimentation water inlet channel, and the fourth inclined plate and the mud-water separation outer box body form a second sedimentation water inlet channel which is narrow at the top and wide at the bottom, so that the sludge is fully refluxed without power, and the problem of sludge full reflux without power in the prior art is solved.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically relating to a vertical denitrification wastewater treatment device. Background Technology

[0002] In the entire process of wastewater treatment plants, the secondary aerobic biological treatment unit is the core link, and its treatment effect directly affects the operating efficiency and effluent quality of the entire wastewater treatment system. However, in current wastewater treatment technologies, wastewater is usually placed in a wastewater tank and then treated by wastewater treatment equipment. In addition, sludge return is an important link in achieving biological denitrification during wastewater treatment. In order to save energy, a non-powered full return method has been tried. However, when current wastewater treatment equipment adopts the non-powered full return method, it is prone to problems such as uneven sludge concentration and unstable return flow during operation, which affects the biological denitrification effect. In addition, non-powered full return can also lead to problems such as pipe blockage and equipment wear, increasing maintenance difficulty and operating costs. To address this issue, a vertical denitrification wastewater treatment device has been invented to solve the problem of non-powered full return of sludge. Summary of the Invention

[0003] To address the aforementioned problems in the prior art, this invention provides a vertical denitrification wastewater treatment device, which solves the problem of non-powered full sludge recirculation in the prior art.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A vertical denitrification wastewater treatment device includes an anoxic zone, an anoxic extraction zone, an anoxic zone, an aerobic zone, a water distribution zone, a sludge-water separation zone, and a clear water zone. The anoxic zone, anoxic extraction zone, and anoxic zone are interconnected from top to bottom, while the aerobic zone, water distribution zone, sludge-water separation zone, and clear water zone are interconnected from bottom to top. The sludge-water separation zone includes a sludge-water separation outer casing, a sludge-water separation tank plate disposed within the outer casing, and inclined tubes disposed inside the sludge-water separation tank plate. The sludge-water separation tank plate is composed of an upper horizontal plate, a middle vertical plate, and a third inclined plate. The material and the third inclined plate are connected sequentially from top to bottom. The upper horizontal plate is sealed to the wall of the sewage tank to form a closed air chamber for improving the efficiency of sludge-water separation. The middle vertical plate and the inclined tube form a sludge-water separation section to ensure uniform distribution of the sludge-water mixture. An inclined bending plate is provided in the water distribution area below the third inclined plate. A fourth inclined plate is provided below the sludge-water separation outer box. The third inclined plate and the bending plate together form the first sedimentation water inlet channel. The fourth inclined plate and the sludge-water separation outer box form a second sedimentation water inlet channel that is narrow at the top and wide at the bottom, so that the sludge can be completely returned without power.

[0006] As a further embodiment of the present invention, the oxygen-deficient lifting zone includes a first vertical plate, a first inclined plate connected to the first vertical plate, a second vertical plate, and a second inclined plate connected to the second vertical plate. The first vertical plate and the first inclined plate form a first part of the oxygen-deficient lifting zone, and the second vertical plate and the second inclined plate form a second part of the oxygen-deficient lifting zone. A liquid flow channel is formed between the first part and the second part. The upper parts of the first vertical plate and the second vertical plate are located above and below the liquid surface, respectively, and the inclination directions of the first inclined plate and the second inclined plate are opposite.

[0007] As a further embodiment of the present invention, the inclination angle between the first inclined plate and the second inclined plate and the horizontal plane is between 0° and 90°.

[0008] As a further aspect of the present invention, the first vertical plate and the first inclined plate, and the second vertical plate and the second inclined plate are all sealed connections.

[0009] As a further aspect of the present invention, the oxygen-deficient lifting zone is provided with a gas diffusion device for providing power to the mud-water mixture.

[0010] As a further embodiment of the present invention, the fourth inclined plate is tilted at an angle of 45° to 60° to the horizontal direction, and the horizontal distance S of the third inclined plate is greater than or equal to C / 2 and S < C, where S represents the horizontal distance of the inclined plate and C represents the width of the outer casing of the mud-water separation unit.

[0011] As a further embodiment of the present invention, a sludge thickening zone is provided below the water distribution zone, and a sludge return channel is provided at the bottom of the sludge thickening zone.

[0012] As a further embodiment of the present invention, the water flow velocity in the cross-section of the water inlet channel formed by the narrow upper spacing of the second sedimentation water inlet channel is greater than or equal to 0.3 m / s, and the water flow velocity in the cross-section of the first sedimentation water inlet channel with the wide lower spacing is less than 0.3 m / s.

[0013] As a further embodiment of the present invention, a nitrification liquid inlet channel is provided at the bottom of the deoxygenation zone, and a denitrification liquid outlet channel is provided at the bottom of the anoxic zone.

[0014] The beneficial effects of this invention are as follows:

[0015] The system is interconnected from top to bottom through anoxic zones, anoxic extraction zones, and anoxic zones; and from bottom to top through aerobic zones, water distribution zones, sludge-water separation zones, and clear water zones. The sludge-water separation zone includes a sludge-water separation tank panel and inclined tubes installed inside the panel. The sludge-water separation zone is composed of the inclined tubes and the sludge-water separation tank panel. The sludge-water separation tank panel consists of an upper horizontal panel, a middle vertical panel, and a lower inclined panel with a certain inward angle. The upper horizontal panel, the middle vertical panel, and the third inclined panel are connected from top to bottom. The upper horizontal panel connects to the wastewater tank. The sealed connection of the pool wall forms a closed air chamber to improve the efficiency of sludge-water separation. The vertical plate in the middle and the inclined tube form a sludge-water separation section to ensure the uniform distribution of the sludge-water mixture. An inclined bending plate is set in the water distribution area below the third inclined plate. A fourth inclined plate is set below the outer box of the sludge-water separation. The third inclined plate and the bending plate together form the first sedimentation water inlet channel. The fourth inclined plate and the outer box of the sludge-water separation form the second sedimentation water inlet channel, which is narrow at the top and wide at the bottom, so that the sludge can be returned without power, thus solving the problem of the sludge being returned without power in the existing technology. Attached Figure Description

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the flow patterns between the different regions of the present invention;

[0018] Figure 2 This is a schematic diagram illustrating the corresponding channel relationships formed when the various zones of this invention are interconnected.

[0019] Figure 3 This is a schematic diagram showing the location of the mud-water separation device of the present invention;

[0020] Figure 4 This is a schematic diagram showing the positions of the various regions in this invention;

[0021] Figure 5 This is a schematic diagram showing the location of the oxygen-deficient extraction zone in this invention.

[0022] Explanation of key component symbols:

[0023] In the diagram: 1. Sludge-water separation tank plate; 2. Sludge thickening tank plate; 3. Inclined tube; 4. Anoxic air extraction device; 5. Tank body and wall; 6. Anoxic zone partition plate; 7. Air mixing equipment; 8. Aeration equipment; 9. Gas diffusion equipment; 10. Aerobic blower; 11. Anaerobic blower; 12. Sealed air chamber; 13. Nitrified liquor return channel; 14. Nitrified liquor inlet channel; 15. First sedimentation inlet channel; 16. Sludge return channel; 17. Denitrified liquor outlet channel; 19. First anoxic zone; 20. Second anoxic zone; A. Aerobic zone; B. Deoxygenated zone; K. Anoxic air extraction zone; D. Anoxic zone; E. Water distribution zone; F. Sludge-water separation zone; G. Clear water zone; H. Sludge thickening zone. Detailed Implementation

[0024] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0025] Please see Figure 1 - Figure 5 This embodiment provides a vertical denitrification wastewater treatment device, including an oxygen-deaeration zone B, an oxygen-deficient extraction zone K, an oxygen-deficient zone D, an aerobic zone A, a water distribution zone E, a sludge-water separation zone F, and a clear water zone G. The oxygen-deaeration zones B, K, and D are interconnected from top to bottom, while the aerobic zones A, E, F, and G are interconnected from bottom to top. The sludge-water separation zone F includes a sludge-water separation tank plate 1 and inclined tubes 3 installed inside the tank plate 1. The sludge-water separation zone F is composed of the inclined tubes 3 and the tank plate 1. The tank plate 1 consists of an upper horizontal plate, a middle vertical plate, and a lower section that slopes inwards to a certain extent. The structure consists of inclined plates at the corners, with an upper horizontal plate, a middle vertical plate, and a third inclined plate connected sequentially from top to bottom. The upper horizontal plate is sealed to the wall of the sewage tank to form a closed air chamber 12 to improve the efficiency of sludge-water separation. The middle vertical plate and the inclined tube 3 form a sludge-water separation section to ensure uniform distribution of the sludge-water mixture. An inclined bending plate is provided in the water distribution area E below the third inclined plate. A fourth inclined plate is provided below the sludge-water separation outer box. The third inclined plate and the bending plate together form the first sedimentation inlet channel 15. The fourth inclined plate and the sludge-water separation outer box form the second sedimentation inlet channel, which is narrow at the top and wide at the bottom, so that the sludge can be returned without power.

[0026] It should be noted that the clear water zone G, the sludge-water separation zone F, and the sludge thickening zone H together constitute the sludge-water separation device. The upper horizontal plate of the sludge-water separation box plate 1 is sealed to the wall of the sewage tank, forming a closed air chamber 12. The vertical plate of the sludge-water separation box plate 1 and the inclined tube 3 together constitute the sludge-water separation zone F. The lower part of the sludge-water separation box plate 1, with a certain inward inclination angle, forms the water distribution zone E. Furthermore, an oxygenation aeration device 8 is installed below the deoxygenation zone B. The placement of the oxygenation aeration device 8 below the deoxygenation zone B is to optimize the operation of the sludge-water separation device, improve sewage treatment efficiency, reduce sludge production, and improve sludge properties, thereby achieving more efficient and environmentally friendly sewage treatment. In addition, the main working area of ​​the oxygenation aeration device 8 is the aeration zone. Furthermore, it is necessary to ensure that the flow velocity of the inlet channel cross-section formed by the narrow spacing of the second sedimentation inlet channel is greater than or equal to 0. The flow velocity of the first sedimentation inlet channel 15 with a width of 0.3 m / s should be less than 0.3 m / s. A sludge thickening zone H is also set below the water distribution zone E, and a sludge return channel 16 is set at the bottom of the sludge thickening zone H.

[0027] In the above structural design, the specific process for achieving non-powered full sludge recirculation is as follows: Air is introduced into the wastewater through the aeration equipment 8. When the wastewater is fully mixed with the activated sludge in the aeration zone and undergoes a biochemical reaction, most of the organic pollutants are decomposed, and the pollutant concentration in the mixed liquor decreases. Then, it passes through the second sedimentation inlet channel, which is narrower at the top and wider at the bottom. During this process, because the flow velocity in the narrow section is greater than or equal to 0.3 m / s, the gas-liquid-sludge mixture entering the second sedimentation inlet channel is prone to violent collisions with the channel wall. Under the combined effect of the upward buoyancy of the bubbles, the bubbles separate from the sludge mixture, preventing bubbles from entering the water distribution zone E and thus affecting the sludge-water separation effect. The sludge-water mixture that has undergone gas-liquid separation in the narrow section of the second sedimentation inlet channel then enters the inlet channel in the wider section.

[0028] Because the flow velocity of the mud-water mixture in the lower wide inlet channel is less than 0.3 m / s, the flow velocity decreases and slows down. This reduces the impact on the subsequent mud-water separation process when it enters the distribution zone E, facilitating the separation. After rectification and bubble separation, the mud-water mixture enters the distribution zone E for further rectification and distribution. Under the influence of the liquid level difference, it moves upwards and then enters the mud-water separation zone F. In the mud-water separation zone F, the mud-water mixture, under the action of the inclined tube 3 packing (the technical requirements for inclined tube 3 packing are an aperture of 80 mm or more, a wall thickness of 0.8 mm or more, and an inclined length of 1.5 m or more), can directly increase the sedimentation load from the traditional secondary sedimentation tank's solids flux of no more than 150 kg / m³.d to 350 kg / m³. Above .d, to achieve sludge-water separation under higher load, the clean water enters the clean water zone G at the top, is collected by the collection tank and discharged, while the separated sludge, under the action of gravity, passes through the water distribution zone E and enters the sludge concentration zone H. The sludge entering the sludge concentration zone H, after a short period of concentration (in principle, no more than 1 hour), flows back to the bottom aeration zone without power through the narrow slit at the bottom of the sludge concentration tank plate 2.

[0029] The sludge-water separation device designed in this way achieves better flow rate control through a special design with a narrow upper and wide lower sedimentation inlet channel. This results in both excellent aeration and rectification effects, leading to good water distribution. Furthermore, the extended, thickened, and reinforced special inclined tube 3 packing material enables excellent sludge-water separation under higher loads. Simultaneously, the separated sludge, under gravity, passes through the water distribution zone E and enters the sludge concentration zone H. After only a short concentration period (generally no more than 1 hour), it is completely recirculated back to the bottom aeration zone without power. Therefore, under these special control conditions, because the sludge is stored in the concentration zone for a short time, the very small amount of bubbles generated by sludge denitrification are unlikely to float the sludge by aggregating on the sludge flocs. This effectively solves the problem of easily floating sludge associated with the inclined tube 3, and simultaneously solves the problem of achieving complete sludge recirculation without underwater mechanical power equipment or energy consumption.

[0030] Following the above embodiments, the oxygen-deficient extraction zone K includes a first vertical plate, a first inclined plate connected to the first vertical plate, a second vertical plate, and a second inclined plate connected to the second vertical plate. The first vertical plate and the first inclined plate form the first part of the oxygen-deficient extraction zone K, and the second vertical plate and the second inclined plate form the second part of the oxygen-deficient extraction zone K. A liquid flow channel is formed between the first part and the second part. The upper parts of the first vertical plate and the second vertical plate are located above and below the liquid surface, respectively. The first inclined plate and the second inclined plate have opposite inclination directions, and the inclination angle between the first inclined plate and the second inclined plate and the horizontal plane is between 0° and 90°. The first vertical plate and the first inclined plate, and the second vertical plate and the second inclined plate are all sealed connections. The oxygen-deficient extraction zone K is equipped with a gas diffusion device for providing power to the mud-water mixture. The gas diffusion device here and the mud-water separation device mentioned above are both part of the denitrification wastewater treatment device. As long as the gas diffusion and mud-water separation functions can be realized, they are acceptable. They will not be described in detail here.

[0031] The working principle of the oxygen-deficient lifting device 4 here is as follows: the bubbles released by the gas diffusion device of the oxygen-deficient lifting device 4 can carry the mud-water mixture from the deoxygenation zone B into the oxygen-deficient zone D under the driving action of buoyancy. The process of lifting by bubbles is called the air-lift reflux project. Since the mud-water mixture entering the deoxygenation zone B is the mud-water mixture at the top after the reaction in the aerobic zone A is completed, it can be regarded as the mud-water mixture at the end of the aeration zone. The above-mentioned air-lift reflux project can also be regarded as the reflux process of nitrification liquid.

[0032] It should be noted that the nitrified liquid lifted by airlift must first undergo this special deoxygenation process (this refers to providing sufficient deoxygenation time in the design, taking into account the process characteristic that microorganisms consume dissolved oxygen during their biological metabolism; based on engineering experience, the designed microbial metabolic deoxygenation time is preferably not less than 15 minutes). That is, the nitrified liquid lifted by airlift can be considered an anaerobic sludge-water mixture. Secondly, the gas diffusion device of the anoxic airlift device 4 cannot be supplied with air, but rather with a sealed gas chamber 12 formed by the sealing connection between the horizontal plate on the upper part of the sludge-water separation outer casing and the tank body of the biological denitrification wastewater treatment device of this invention. Therefore, it is evident that the anoxic airlift process... The gas-driven power source for the gas diffusion device of lifting device 4 is the inert gas in the sealed gas chamber 12. This is because the gas collected in the sealed gas chamber 12 mainly comes from N2 produced by anoxic denitrification, as well as a small amount of inert gas mainly composed of N2 and CO2 remaining after the oxygen is consumed by the microorganisms in the aerobic zone A. In summary, since the dissolved oxygen in the nitrified liquid lifted by the anoxic lifting device 4 is extremely low, and the gas source for the gas diffusion device used for lifting is inert gas, the design of air lifting and reflux of nitrified liquid can effectively avoid the excessive oxygen brought in by air lifting, which would affect the denitrification effect in the anoxic zone D. At the same time, it also achieves nitrified liquid reflux without underwater mechanical power equipment.

[0033] It is worth mentioning that, following the water flow direction, the influent first enters the anoxic zone D. Under the action of denitrifying bacteria in the anoxic zone D, denitrification is completed first in the anoxic zone D. To ensure good mass transfer effect of mud-water mixing in the anoxic zone D, an air mixing device 7 is also arranged at the bottom of the anoxic zone D. The air source of the air mixing device 7 also needs to come from the inert gas in the sealed air chamber 12 formed by the horizontal plate on the upper part of the mud-water separation outer box and the tank body of the biological denitrification wastewater treatment device, which can collect the internal gas, so as to avoid air being introduced during air mixing and affecting the denitrification effect. After the mud-water mixture has completed denitrification, it enters the aerobic zone A, where microorganisms make full use of the dissolved oxygen provided by the oxygenation aeration device 8.

[0034] In the aerobic zone A, oxygen in the water undergoes carbonization and ammonia nitrogen oxidation, converting organic matter into CO2 and ammonia nitrogen into nitrates or nitrites for removal. After the aerobic reaction, a portion of the sludge-water mixture enters the distribution zone E through the sedimentation inlet channel, then the sludge-water separation zone F. The clear water enters the clear water zone G. The separated sludge then enters the sludge thickening zone H through the distribution zone E. Under gravity, the sludge in the sludge thickening zone H then enters the aerobic zone A to continue participating in biological metabolism. Meanwhile, another portion of the sludge, after the aerobic reaction... Driven by the oxygen-deficient lifting device 4, the sludge-water mixture enters the deoxygenation zone B. After the dissolved oxygen is consumed in the deoxygenation zone B, the sludge-water mixture then enters the oxygen-deficient lifting zone K. Subsequently, under the buoyancy of the bubbles diffused by the gas diffusion device, it is carried into the oxygen-deficient zone D. The sludge-water mixture entering the oxygen-deficient zone D mixes with the influent and completes denitrification in the oxygen-deficient zone D. Then, it enters the aeration zone and mixes with the sludge from the non-powered full return sludge of the sludge-water separation device. Together, they complete the biological metabolic processes such as carbon removal and ammonia nitrogen removal in the aerobic zone A. This cycle repeats continuously.

[0035] To conserve water resources and achieve sustainable wastewater treatment, in one embodiment, a nitrification liquid inlet channel 14 is provided at the bottom of the deoxygenated zone B, and a denitrification liquid outlet channel 17 is provided at the bottom of the anoxic zone D. A nitrification liquid return channel 13 is provided in the deoxygenated zone B to receive the sludge-water mixture after metabolism from the top of the aerobic zone A. A denitrification liquid channel is provided at the bottom of the anoxic zone D for the sludge to enter the aerobic zone A after denitrification. A sedimentation inlet channel that is narrow at the top and wide at the bottom is provided between the water distribution zone E and the sludge thickening zone H of the sludge separation device. A sludge return channel 16 is provided below the sludge thickening zone H for the sludge to slide into the aerobic zone A. The microorganisms cycle continuously. The cyclical metabolic reactions of microorganisms are perfectly interconnected through these independent channels. A nitrification liquid return channel 13 is set in the deoxygenated zone B to receive the sludge-water mixture after metabolism from the top of the aerobic zone A. A denitrification liquid channel is set at the bottom of the anoxic zone D to receive the denitrified liquid that is about to enter the aerobic zone A after denitrification. A sedimentation inlet channel that is narrow at the top and wide at the bottom is set between the water distribution zone E of the sludge-water separation device and the sludge concentration zone H. A sludge return channel 16 is set below the sludge concentration zone H so that the sludge can slide back to the aerobic zone A. The cyclical metabolic reactions of microorganisms are perfectly interconnected through these independent channels.

[0036] Furthermore, the independent channel design of deoxygenated zone B and anoxic zone D ensures the smooth progress of nitrification and denitrification processes, improving nitrogen removal efficiency. This design reduces the demand for fresh water and other resources by recycling the sludge-water mixture and sludge, while also lowering energy consumption. The independent channel design enhances the system's resistance to shock loads, helping to maintain stable treatment results. The sludge thickening and return channels help improve sludge thickening efficiency and reduce the difficulty of subsequent treatment. In summary, this design improves the efficiency and stability of wastewater treatment by optimizing the microbial metabolic environment and pathways, while saving resources and energy, contributing to the achievement of sustainable wastewater treatment goals.

[0037] To further improve the separation efficiency and overall performance of the vertical denitrification wastewater treatment device, in one embodiment, the third inclined plate is tilted at an angle of 45° to 60° to the horizontal direction, and the horizontal distance of the third inclined plate is S ≥ C / 2 and S < C, where S represents the horizontal distance of the inclined plate and C represents the width of the outer casing of the sludge-water separation unit. The 45° to 60° angle effectively increases the water flow velocity while maintaining sufficient contact time, allowing solid particles in the wastewater to more easily slide down the inclined plate under gravity, thus achieving sludge-water separation. The design of a horizontal distance S ≥ C / 2 and S < C ensures that the inclined plate is long enough to provide more separation space without being too long and affecting the footprint.

[0038] An excessively large area can affect the overall stability of the device. The inclined design of the inclined plate increases the contact area between the mud and water, which helps to improve the removal efficiency of solid particles. The design of the inclined plate helps to improve the treatment capacity of the sewage treatment device because it can more effectively separate solids and liquids, reducing the burden on subsequent treatment steps. Due to the inclined design of the inclined plate, the entire sewage treatment device can be more compact and save space.

[0039] In addition, the influent first enters the top of the anoxic zone D, undergoes a first deflection through the lower sealing plate of the anoxic lifting device 4, and then enters the second anoxic zone 20. Since the mud-water mixing in the first anoxic zone is from top to bottom, no mud-water mixing equipment is needed to achieve complete mixing with the influent. However, to prevent mud-water separation, the mud-water mixture entering the second anoxic zone 20 is equipped with an air-mixing device 7 at its bottom for effective mud-water mixing. The air source is inert gas collected in the sealed air chamber 12. After the denitrification reaction in the anoxic zone D is completed, the mud-water mixture then enters the bottom of the aerobic zone A, where it undergoes another complete mud-water mixing under the stirring of the oxygenation aeration device 8, while simultaneously...

[0040] The organisms fully utilize the oxygen released by the aeration device 8 to remove organic matter and ammonia nitrogen in the aerobic zone A. After the biological metabolic reaction in the aerobic zone A, part of the mud-water mixture in the upper part of the aerobic zone A enters the mud-water separation device of the present invention to achieve mud-water separation, and the other part of the mud-water mixture, as nitrification liquid, enters the deoxygenation zone B under the action of the oxygen-deficient lifting device 4. After deoxygenation in the deoxygenation zone B, the mud-water mixture passes through the oxygen-deficient lifting zone K and then enters the first oxygen-deficient zone 19, thus continuously participating in the cyclic reaction.

[0041] Finally, it should be added that, as Figure 1 As shown, the denitrification wastewater treatment device also includes an anaerobic blower 11 and an aerobic blower 10. The sludge-water mixture from the deoxygenation zone B enters the anoxic extraction zone K, and the sludge-water mixture from the anoxic extraction zone K enters the anoxic zone D. Their common power source comes from the gas diffusion device in the anoxic extraction zone K. The anaerobic blower 11 provides the blowing power source for the gas diffusion device in the anoxic extraction zone K and the gas stirring device in the anoxic zone D. The air source for the anaerobic blower 11 comes from the gas collected in the closed air chamber 12. The aerobic blower 10 provides the air supply power source for the oxygenation aeration device 8 of the present invention.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A vertical denitrification wastewater treatment device, characterized in that, The system includes an oxygen-deoxygenating zone, an oxygen-deficient extraction zone, an oxygen-deficient zone, an aerobic zone, a water distribution zone, a sludge-water separation zone, and a clear water zone. The oxygen-deoxygenating zone, oxygen-deficient extraction zone, and oxygen-deficient zone are interconnected from top to bottom, while the aerobic zone, water distribution zone, sludge-water separation zone, and clear water zone are interconnected from bottom to top. The sludge-water separation zone includes a sludge-water separation outer casing, a sludge-water separation tank plate disposed within the outer casing, and inclined tubes disposed inside the sludge-water separation tank plate. The sludge-water separation tank plate is composed of an upper horizontal plate, a middle vertical plate, and a third inclined plate. Connected sequentially from top to bottom, the upper horizontal plate is sealed to the wall of the sewage tank to form a closed air chamber for improving the efficiency of sludge-water separation. The middle vertical plate and the inclined tube form a sludge-water separation section to ensure uniform distribution of the sludge-water mixture. An inclined bending plate is provided in the water distribution area below the third inclined plate. A fourth inclined plate is provided below the sludge-water separation outer box. The third inclined plate and the bending plate together form the first sedimentation water inlet channel. The fourth inclined plate and the sludge-water separation outer box form the second sedimentation water inlet channel, which is narrow at the top and wide at the bottom, so that the sludge can be completely returned without power. The flow velocity of the water inlet channel formed by the narrow upper spacing of the second sedimentation inlet channel must be greater than or equal to 0.3 m / s, and the flow velocity of the water inlet channel formed by the wide lower spacing of the first sedimentation inlet channel must be less than 0.3 m / s. The inclined tube has a diameter of 80 mm or more, a wall thickness of 0.8 mm or more, and an inclined length of 1.5 m or more. The sealed air chamber is used to collect an inert gas composed of N2 produced by anoxic denitrification and CO2 remaining from the metabolism of microorganisms in the aerobic zone, and serves as the gas lift power source for the anoxic lift zone. Below the water distribution area is a sludge thickening area, and at the bottom of the sludge thickening area is a sludge return channel. The fourth inclined plate has an inclination angle of 45° to 60° with the horizontal direction, and the horizontal distance of the fourth inclined plate is S≥C / 2 and S<C, where S represents the horizontal distance of the inclined plate and C represents the width of the mud-water separation outer box.

2. The vertical denitrification wastewater treatment device according to claim 1, characterized in that, The oxygen-deficient lifting zone includes a first vertical plate, a first inclined plate connected to the first vertical plate, a second vertical plate, and a second inclined plate connected to the second vertical plate. The first vertical plate and the first inclined plate form a first part of the oxygen-deficient lifting zone, and the second vertical plate and the second inclined plate form a second part of the oxygen-deficient lifting zone. A liquid flow channel is formed between the first part and the second part. The upper parts of the first vertical plate and the second vertical plate are located above and below the liquid surface, respectively, and the inclination directions of the first inclined plate and the second inclined plate are opposite.

3. A vertical denitrification wastewater treatment device according to claim 2, characterized in that, The inclination angle between the first and second inclined plates and the horizontal plane is between 0° and 90°.

4. A vertical denitrification wastewater treatment device according to claim 2, characterized in that, The first vertical plate and the first inclined plate, and the second vertical plate and the second inclined plate are all sealed connections.

5. A vertical denitrification wastewater treatment device according to claim 1, characterized in that, The oxygen-deficient lifting zone is equipped with a gas diffusion device to provide power for the mud-water mixture.

6. A vertical denitrification wastewater treatment device according to claim 1, characterized in that, The bottom of the deoxygenated zone is provided with a nitrification liquid inlet channel, and the bottom of the anoxic zone is provided with a denitrification liquid outlet channel.

Images