Vertical denitrification sewage treatment device

Abstract

The invention relates to a vertical denitrification sewage treatment device, and belongs to the technical field of sewage treatment.The vertical denitrification sewage treatment device is characterized in that an upper horizontal plate, a middle vertical plate and a third inclined plate are sequentially connected from top to bottom, and the upper horizontal plate is hermetically connected with the wall of a sewage pool to form a closed air chamber for improving mud-water separation efficiency; a mud-water separation part for ensuring uniform distribution of a mud-water mixture is formed by the middle vertical plate and the inclined pipe, an inclined bent plate is arranged in a water distribution area below the third inclined plate, a fourth inclined plate is arranged below the mud-water separation outer box body, and the third inclined plate and the bent plate jointly form a first precipitation water inlet channel; and a fourth inclined plate and the sludge-water separation outer box body form a second precipitation water inlet channel with a narrow upper part and a wide lower part, so that the sludge is subjected to unpowered total reflux, and the problem of unpowered total reflux of the sludge in the prior art is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a vertical denitrification sewage treatment device. Background Art

[0002] In the whole process of sewage treatment plant, the secondary aerobic biochemical unit is the core link, and its treatment effect directly affects the operation efficiency and effluent quality of the whole sewage treatment system. However, in the current sewage treatment technology, sewage is usually put into a sewage pool and then treated by sewage treatment equipment. In addition, in the sewage treatment process, sludge return is an important link to achieve biological denitrification. In order to save energy, the unpowered full reflux method is also tried. However, when the current sewage treatment device adopts the unpowered full reflux method for treatment, it is easy to cause uneven sludge concentration and unstable reflux flow during operation, thereby affecting the biological denitrification effect. In addition, the unpowered full reflux may also cause pipeline blockage, equipment wear and other problems, increasing the difficulty of maintenance and operation cost. To solve this problem, the invention proposes a vertical denitrification sewage treatment device, which aims to solve the problem of unpowered full reflux of sludge. Summary of the invention

[0003] In order to solve the above problems existing in the prior art, the present invention provides a vertical denitrification sewage treatment device, which solves the problem of unpowered full reflux of sludge in the prior art.

[0004] The purpose of the present invention can be achieved by the following technical solutions: A vertical denitrification sewage treatment device, comprising an oxygen removal zone, an anoxic stripping zone, an anoxic zone, an aerobic zone, a water distribution zone, a mud-water separation zone, and a clean water zone, wherein the oxygen removal zone, the anoxic stripping zone, the anoxic zone, the aerobic zone, the water distribution zone, the mud-water separation zone, and the clean water zone are interconnected from bottom to top in sequence; the mud-water separation zone comprises a mud-water separation outer box, a mud-water separation box plate arranged in the mud-water separation outer box, and an inclined pipe arranged inside the mud-water separation box plate, wherein the mud-water separation box plate is composed of an upper horizontal plate, a middle vertical plate, and a third inclined plate, wherein the upper horizontal plate, the middle vertical plate, and the third inclined plate are connected to each other in sequence from bottom to top; The plates are connected in sequence from top to bottom, the upper horizontal plate is sealed and connected to the wall of the sewage pool to form a closed air chamber for improving the mud-water separation efficiency, the middle vertical plate and the inclined tube form a mud-water separation part for ensuring uniform distribution of the mud-water mixture, the water distribution area below the third inclined plate is provided with an inclined bending plate, and the fourth inclined plate is provided below the mud-water separation outer box body, the third inclined plate and the bending plate together form a first sedimentation water inlet channel, 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 can be fully refluxed without power.

[0005] As a further solution of the present invention, the anoxic stripping 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 constitute a first part of the anoxic stripping zone, the second vertical plate and the second inclined plate constitute a second part of the anoxic stripping 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 respectively located above and below the liquid surface, and the inclination directions of the first inclined plate and the second inclined plate are opposite.

[0006] As a further solution 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°.

[0007] As a further solution of the present invention, the first vertical plate and the first inclined plate, as well as the second vertical plate and the second inclined plate are all sealed together.

[0008] As a further solution of the present invention, the anoxic stripping zone is provided with a gas diffusion device for providing power for the mud-water mixture.

[0009] As a further solution of the present invention, the inclination angle of the fourth inclined plate to the horizontal direction is 45°~60°, and the horizontal distance of the inclination of the third inclined plate is S≥C / 2 and S<C, where S represents the horizontal distance of the inclination of the inclined plate, and C represents the box width of the mud-water separation outer box.

[0010] As a further solution of the present invention, a sludge concentration zone is further provided below the water distribution zone, and a sludge return channel is provided at the bottom of the sludge concentration zone.

[0011] As a further solution of the present invention, the water flow rate of the water inlet channel cross section formed by the upper narrow spacing of the second sedimentation water inlet channel is greater than or equal to 0.3m / s, and the water flow rate of the lower wide first sedimentation water inlet channel cross section is less than 0.3m / s.

[0012] As a further solution of the present invention, a nitrification liquid inlet channel is provided at the bottom of the oxygen removal zone, and a denitrification liquid outlet channel is provided at the bottom of the anoxic zone.

[0013] The beneficial effects of the present invention are: The deoxidation zone, anoxic stripping zone, anoxic zone, aerobic zone, water distribution zone, mud-water separation zone and clean water zone are interconnected from bottom to top; the mud-water separation zone includes a mud-water separation box plate and an inclined pipe arranged inside the mud-water separation box plate. The mud-water separation zone is composed of an inclined pipe and a mud-water separation box plate. The mud-water separation box plate is composed of an upper horizontal plate, a middle vertical plate and a lower inclined plate with a certain inward inclination angle. The upper horizontal plate, the middle vertical plate and the third inclined plate are connected in sequence from top to bottom. The upper horizontal plate is tightly connected to the wall of the sewage pool. The seal connection forms an enclosed air chamber for improving the mud-water separation efficiency. The middle vertical plate and the inclined tube form a mud-water separation part for ensuring uniform distribution of the mud-water mixture. The water distribution area below the third inclined plate is provided with an inclined bending plate. A fourth inclined plate is provided below the mud-water separation outer box. The third inclined plate and the bending plate together form a first sedimentation water inlet channel. The fourth inclined plate and the mud-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 fully refluxed without power, which solves the problem of unpowered full reflux of sludge in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0015] Figure 1 It is a schematic diagram of the flow pattern between the various zones of the present invention; Figure 2 A schematic diagram of the corresponding channel relationship formed when the zones of the present invention are interconnected; Figure 3 It is a schematic diagram of the position of the mud-water separation device of the present invention; Figure 4 It is a schematic diagram of the positions between the various zones of the present invention; Figure 5 It is a schematic diagram of the location of the anoxic stripping zone of the present invention.

[0016] Description of main component symbols: In the figure: 1. Mud-water separation box plate; 2. Sludge concentration box plate; 3. Inclined pipe; 4. Anoxic stripping device; 5. Pool wall; 6. Anoxic zone partition; 7. Gas mixing equipment; 8. Oxygen aeration equipment; 9. Gas diffusion equipment; 10. Aerobic fan; 11. Anaerobic fan; 12. Closed air chamber; 13. Nitrification liquid reflux channel; 14. Nitrification liquid inlet channel; 15. First sedimentation water inlet channel; 16. Sludge reflux channel; 17. Denitrification liquid outlet channel; 19. First anoxic zone; 20. Second anoxic zone; A. Aerobic zone; B. Deoxidation zone; K. Anoxic stripping zone; D. Anoxic zone; E. Water distribution zone; F. Mud-water separation zone; G. Clean water zone; H. Sludge concentration zone. DETAILED DESCRIPTION

[0017] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0018] See also Figure 1 - Figure 5 The present embodiment provides a vertical denitrification sewage treatment device, including anoxic zone B, anoxic stripping zone K, anoxic zone D, aerobic zone A, water distribution zone E, mud-water separation zone F, and clean water zone G. The anoxic zone B, anoxic stripping zone K, anoxic zone D, aerobic zone A, water distribution zone E, mud-water separation zone F, and clean water zone G are interconnected from bottom to top; the mud-water separation zone F includes a mud-water separation box plate 1 and an inclined pipe 3 arranged inside the mud-water separation box plate 1. The mud-water separation zone F is composed of the inclined pipe 3 and the mud-water separation box plate 1. The mud-water separation box plate 1 is composed of an upper horizontal plate, a middle vertical plate, and a lower inclined plate with a certain inward inclination angle. The upper horizontal plate, the middle vertical plate and the third inclined plate are connected in sequence from top to bottom. The upper horizontal plate is sealed and connected to the wall of the sewage pool to form a closed air chamber 12 for improving the mud-water separation efficiency. The middle vertical plate and the inclined tube 3 form a mud-water separation part for ensuring uniform distribution of the mud-water mixture. The water distribution area E below the third inclined plate is provided with an inclined bending plate. A fourth inclined plate is provided below the mud-water separation outer box. The third inclined plate and the bending plate together form a first sedimentation water inlet channel 15. The fourth inclined plate and the mud-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 fully refluxed without power.

[0019] It should be noted that the clear water area G, the mud-water separation area F and the sludge concentration area H together constitute the mud-water separation device. The upper horizontal plate of the mud-water separation box plate 1 is sealed and connected to the wall of the sewage pool to form a closed air chamber 12. The vertical plate of the mud-water separation box plate 1 and the inclined pipe 3 together constitute the mud-water separation area F. The third inclined plate at the lower part of the mud-water separation box plate 1 with a certain inward inclination angle constitutes the water distribution area E, and an oxygenating aeration device 8 is arranged below the deoxidation zone B. The arrangement of the oxygenating aeration device 8 below the deoxidation zone B is to optimize the operation of the mud-water separation device. The effect is improved, the sewage treatment efficiency is improved, the sludge production is reduced and the sludge properties are improved, so as to achieve more efficient and environmentally friendly sewage treatment. In addition, the main working area of ​​the oxygenated aeration equipment 8 is the aeration zone; in addition, it is also necessary to ensure that the water flow rate of the water inlet channel section formed by the upper narrow spacing of the second sedimentation water inlet channel is greater than or equal to 0.3m / s, and the water flow rate of the water inlet channel 15 section formed by the lower wide spacing is less than 0.3m / s. A sludge concentration zone H is also arranged below the water distribution zone E, and a sludge return channel 16 is arranged at the bottom of the sludge concentration zone H.

[0020] In the above structural design, the specific process of realizing the unpowered full return of sludge is: air is injected into the sewage through the oxygenated aeration equipment 8. When the sewage is fully mixed with the activated sludge in the aeration zone and undergoes biochemical reactions, most of the organic pollutants are decomposed. At this time, the pollutant concentration in the mixed liquid is reduced, and then it passes through the second sedimentation water inlet channel which is narrow at the top and wide at the bottom. In this process, since the water flow rate of the narrow upper part is greater than or equal to 0.3m / s, it is very easy to cause the gas-liquid mud-water mixture entering the second sedimentation water inlet channel to collide violently with the channel wall. Under the joint action of the upward buoyancy of the bubbles, the bubbles and the mud-water mixture are separated, which can prevent the bubbles from entering the water distribution area E, thereby affecting the mud-water separation effect. The mud-water mixture that has undergone gas-liquid separation in the narrow section of the second sedimentation water inlet channel then enters the water inlet channel of the lower wide part. Since the flow rate of the mud-water mixture in the water inlet channel of the lower wide part is less than 0.3m / s, the flow rate of the mud-water mixture is reduced and slowed down. After entering the water distribution area E, it will not affect the next The mud-water separation produces a large water flow disturbance, which is beneficial to the mud-water separation. After rectification and bubble separation, the mud-water mixture enters the water distribution area E to achieve further rectification and distribution. Under the action of the liquid level difference, it moves upward and then enters the mud-water separation area F. The mud-water mixture entering the mud-water separation area F can reduce the sedimentation load from the traditional two-stage filling to the inclined tube 3 filling under the action of the inclined tube 3 filling (the technical requirements of the inclined tube 3 filling are to select the inclined tube 3 filling with a hole diameter of more than 80mm, a wall thickness of more than 0.8mm and an inclined length of more than 1.5m). The solid flux of the sedimentation tank does not exceed 150kg / m3.d, and can be directly increased to more than 350kg / m3.d to achieve mud-water separation under higher load. The clean water enters the clean water area G at the top, is collected by the collection tank and then discharged, while the separated sludge passes through the water distribution area E under the action of gravity and enters the sludge concentration area H. The sludge entering the sludge concentration area H, after a short concentration (in principle, no more than 1 hour), is returned to the aeration area at the bottom through the narrow gap at the bottom of the sludge concentration box plate 2 without power; The mud-water separation device designed in this way can achieve better flow rate control through the special design of the sedimentation water inlet channel that is narrow at the top and wide at the bottom, which can achieve both good gas release effect and good rectification effect, thereby achieving good water distribution effect, and under the joint action of the special inclined tube 3 filler that is lengthened, thickened and thickened, it can achieve good mud-water separation effect under higher load. At the same time, due to the separated sludge passing through the water distribution area E under the action of gravity, the sludge entering the sludge concentration area H can achieve unpowered full return to the aeration area at the bottom after only a short concentration (in principle not more than 1 hour). Therefore, under this special control condition, due to the short storage time of the sludge in the concentration area, the very small amount of bubbles generated by the sludge denitrification is difficult to float the sludge by gathering on the sludge flocs, so it can effectively solve the disadvantage of easy floating sludge faced by the inclined tube 3, and can also simultaneously solve the problem of no underwater mechanical power equipment and no energy consumption, so that the unpowered full return of the sludge can be achieved.

[0021] Following the above embodiment, the anoxic stripping 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 constitute the first part of the anoxic stripping zone K, and the second vertical plate and the second inclined plate constitute the second part of the anoxic stripping 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 respectively located above and below the liquid surface. The first inclined plate and the second inclined plate are inclined in opposite directions. The inclination angles between the first inclined plate and the second inclined plate and the horizontal plane are 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. The anoxic stripping zone K is provided with a gas diffusion device for providing power for the mud-water mixture. The gas diffusion device here and the mud-water separation device mentioned above are all part of the denitrification sewage treatment device. As long as the gas diffusion and mud-water separation functions can be achieved, no further details will be given here. The working principle of the anoxic stripping device 4 is as follows: the bubbles released by the anoxic stripping device 4 through the gas diffusion device can drive the muddy and water mixed liquid from the deoxidation zone B into the anoxic zone D under the driving effect of buoyancy. The process of lifting by bubbles is the air stripping reflux project. Since the muddy and water mixed liquid entering the deoxidation zone B is the muddy and water mixed liquid from the top of the aerobic zone A after the reaction is completed, it can be regarded as the muddy and water mixed liquid at the end of the aeration zone. The above-mentioned air stripping reflux project can also be regarded as the reflux process of the nitrification liquid. One point that needs to be explained is that the nitrified liquid lifted by gas lift must first undergo this special deoxygenation process (here, it means that by giving the process characteristic that microorganisms need to consume dissolved oxygen during their own biological metabolism process, sufficient deoxygenation time is given during the design, and the designed microbial metabolism deoxygenation time is preferably selected to be not less than 15 minutes based on engineering experience), that is, the nitrified liquid lifted by gas lift can be regarded as an oxygen-free mud-water mixture. Secondly, the gas diffusion device of the anoxic lift device 4 cannot be supplied by air, but by the closed air chamber 12 formed by the sealed connection between the horizontal plate on the upper part of the mud-water separation outer box and the tank body of the biological denitrification sewage treatment device of the present invention, which can collect internal gas. It can be seen that the anoxic The gas-driven power source of the gas diffusion device of the lifting device 4 is the inert gas in the closed gas chamber 12, because the gas collected in the closed gas chamber 12 mainly comes from N2 produced by anaerobic denitrification, and a small amount of inert gas mainly composed of N2 and CO2 remaining after the oxygen is consumed by the metabolism of microorganisms in the aerobic zone A. In summary, since the nitrification liquid lifted by the anaerobic lifting device 4 contains extremely low dissolved oxygen, and the gas source of the gas diffusion device used for lifting is an inert gas, the nitrification liquid adopts the design of gas lifting and reflux nitrification liquid, which can well avoid the excessive oxygen brought in by gas lifting, which affects the denitrification effect of the anoxic zone D, and at the same time, it also realizes the reflux of nitrification liquid without underwater mechanical power equipment.

[0022] It is worth mentioning that, according to the direction of water flow, the incoming water first enters the anoxic zone D, and under the action of the denitrifying and denitrifying bacteria in the anoxic zone D, the denitrification and denitrification are first completed in the anoxic zone D. In order to ensure a good mass transfer effect of the mud-water mixture in the anoxic zone D, a gas stirring device 7 is also arranged at the bottom of the anoxic zone D. The gas source of the gas stirring device 7 also needs to come from the inert gas in the closed gas chamber 12 that can collect the internal gas formed by the sealed connection between the horizontal plate on the upper part of the mud-water separation outer box and the tank body of the biological denitrification sewage treatment device, so as to avoid the introduction of air during gas stirring, which affects the denitrification and denitrification effect. After the denitrification and denitrification, the mud-water mixture enters the aerobic zone A next, and the microorganisms make full use of the oxygen dissolved in the water provided by the oxygenating aeration device 8 to complete the carbonization and oxidation of ammonia nitrogen in the aerobic zone A, so as to realize the conversion of organic matter into CO2 and the conversion of ammonia nitrogen into nitrate or nitrite for removal. The mud-water after the aerobic reaction A part of the mixed liquid passes through the sedimentation water inlet channel and enters the water distribution area E, and then enters the mud-water separation area F. The clean water enters the clean water area G. The separated sludge then passes through the water distribution area E and enters the sludge concentration area H. The sludge entering the sludge concentration area H enters the aerobic area A under the action of gravity to continue to participate in the biological metabolic process, while the other part of the mud-water mixed liquid after the aerobic reaction enters the deoxygenation area B under the driving of the anoxic stripping device 4 gas. The mud-water mixed liquid after the dissolved oxygen consumption in the deoxygenation area B then enters the anoxic stripping area K, and then is brought into the anoxic area D under the action of the buoyancy of the bubbles diffused by the gas diffusion device. The mud-water mixed liquid entering the anoxic area D is mixed with the influent water in the anoxic area D to complete denitrification and denitrification, and then enters the aeration area and is mixed with the sludge of the unpowered full reflux of the mud-water separation device to complete the biological metabolic processes such as carbon removal and ammonia removal in the aerobic area A, and the reciprocating cycle reaction is repeated over and over again; In order to save water resources and realize sustainable sewage treatment, in one embodiment, a nitrification liquid inlet channel 14 is provided at the bottom of the deoxygenation zone B, a denitrification liquid outlet channel 17 is provided at the bottom of the anoxic zone D, a nitrification liquid reflux channel 13 is provided in the deoxygenation zone B for receiving the sludge-water mixture after metabolism from the top of the aerobic zone A, a denitrification liquid channel for entering the aerobic zone A after denitrification is completed is provided at the bottom of the anoxic zone D, a sedimentation water inlet channel with a narrow top and a wide bottom is provided between the water distribution zone E of the sludge-water separation device and the sludge concentration zone H, and a sludge reflux channel 16 for the sludge to slide to the aerobic zone A is provided below the sludge concentration zone H, and the microorganisms repeat the cycle. The reciprocating metabolic reaction of microorganisms is perfectly interconnected through these independent channels. A nitrification liquid reflux channel 13 is set in the deoxidation 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 for entering the aerobic zone A after denitrification. A narrow upper and wide lower sedimentation water inlet channel is set between the water distribution zone E of the mud-water separation device and the sludge concentration zone H. A sludge reflux channel 16 for the sludge to slide back to the aerobic zone A is set below the sludge concentration zone H. The reciprocating metabolic reaction of microorganisms is perfectly interconnected through these independent channels. In addition, the independent channel design of the oxygen elimination zone B and the anoxic zone D ensures the smooth progress of the nitrification and denitrification processes and improves the nitrogen removal rate. This design reduces the demand for fresh water and other resources by recycling the mud-water mixture and sludge, while reducing energy consumption. The design of each independent channel improves the system's impact resistance and helps maintain a stable treatment effect. The sludge concentration and return channels help to improve the sludge concentration effect and reduce the difficulty of subsequent treatment. In short, this design improves the efficiency and stability of sewage treatment by optimizing the microbial metabolic environment and pathways, while saving resources and energy, and helps achieve sustainable sewage treatment goals.

[0023] In order to further improve the separation efficiency and overall performance of the vertical denitrification sewage treatment device, in one embodiment, the third inclined plate is inclined at an angle of 45°~60° to the horizontal direction, and the horizontal distance of the inclination of the third inclined plate is S≥C / 2 and S<C, wherein S represents the horizontal distance of the inclination of the inclined plate, and C represents the box width of the mud-water separation outer box, wherein the inclination angle of the inclined plate is 45°~60°, and this angle range can effectively increase the speed of the water flow while maintaining sufficient contact time, so that the solid particles in the sewage can more easily slide down the inclined plate under the action of gravity, thereby realizing mud and water separation. The design of the horizontal distance S≥C / 2 and S<C ensures that the length of the inclined plate is long enough to provide more separation space, and at the same time it will not be too long to cause excessive floor space or affect the overall stability of the device. The inclined design of the inclined plate increases the mud-water contact area, 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 and reduce the burden of subsequent treatment steps. Due to the inclined design of the inclined plate, the entire sewage treatment device can be more compact and space-saving.

[0024] In addition, the influent first enters the top of the anoxic zone D, passes through the lower sealing plate of the anoxic stripping device 4, undergoes the first deflection, and then enters the second anoxic zone 20. Since the first anoxic zone is muddy and water mixed from top to bottom, it is not necessary to set up any muddy and water mixing and stirring equipment to achieve complete mixing with the influent. In order to avoid mud and water separation, the mud and water mixture entering the second anoxic zone 20 is provided with a gas stirring device 7 for good mud and water mixing at its bottom, and its gas source is the inert gas collected by the closed air chamber 12. After the denitrification reaction is completed in the anoxic zone D, the mud and water mixture then enters the bottom of the aerobic zone A, and is stirred by the oxygenated aeration device 8 to perform complete mud and water mixing again. At the same time, the microorganisms make full use of the oxygen released by the oxygenated aeration device 8 to complete the removal of organic matter and ammonia nitrogen in the aerobic zone A. After the biological metabolic reaction in the aerobic zone A, a part of the mud and water mixture in the upper part of the aerobic zone A enters the mud and water separation device of the present invention to achieve mud and water separation, and the other part of the mud and water mixture is used as a nitrification liquid. Under the action of the anoxic stripping device 4, it enters the deoxidation zone B. The mud and water mixture after deoxidation in the deoxidation zone B passes through the anoxic stripping zone K and then enters the first anoxic zone 19, and thus participates in the reciprocating cycle reaction over and over again.

[0025] Finally, it should be added that Figure 1As shown, the denitrification sewage treatment device also includes an anaerobic fan 11 and an aerobic fan 10. The mud-water mixture in the deoxidation zone B enters the anoxic stripping zone K and the mud-water mixture in the anoxic stripping zone K enters the anoxic zone D. Their common power source comes from the gas diffusion device in the anoxic stripping zone K. The anaerobic fan 11 provides a blowing power source for the gas diffusion device in the anoxic stripping zone K and the gas stirring device in the anoxic zone D. The gas source of the anaerobic fan 11 comes from the gas collected in the closed air chamber 12. The aerobic fan 10 provides a wind supply power source for the oxygenated aeration equipment 8 of the present invention.

[0026] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A vertical denitrification sewage treatment device, characterized in that: It includes an oxygen elimination zone, anoxic stripping zone, anoxic zone, aerobic zone, water distribution zone, mud-water separation zone, and clean water zone. The oxygen elimination zone, anoxic stripping zone, anoxic zone, aerobic zone, water distribution zone, mud-water separation zone, and clean water zone are interconnected from bottom to top in sequence; the mud-water separation zone includes a mud-water separation outer box, a mud-water separation box plate arranged in the mud-water separation outer box, and an inclined pipe arranged inside the mud-water separation box plate. The mud-water separation box plate is composed of an upper horizontal plate, a middle vertical plate, and a third inclined plate. The upper horizontal plate, the middle vertical plate, and the third inclined plate are interconnected from top to bottom in sequence. The upper horizontal plate is sealed and connected to the wall of the sewage tank to form a closed air chamber for improving the mud-water separation efficiency. The middle vertical plate and the inclined tube form a mud-water separation part for ensuring uniform distribution of the mud-water mixture. The water distribution area below the third inclined plate is provided with an inclined bending plate. A fourth inclined plate is provided below the mud-water separation outer box. The third inclined plate and the bending plate together form a first sedimentation water inlet channel. The fourth inclined plate and the mud-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 fully refluxed without power.

2. A vertical denitrification wastewater treatment device according to claim 1, characterized in that: The anoxic stripping 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 constitute a first part of the anoxic stripping zone, and the second vertical plate and the second inclined plate constitute a second part of the anoxic stripping 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 respectively located above and below the liquid surface, and the first inclined plate and the second inclined plate have opposite inclination directions.

3. A vertical denitrification sewage treatment device according to claim 2, characterized in that: The inclination angles between the first inclined plate and the second inclined plate and the horizontal plane are between 0° and 90°.

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

5. A vertical denitrification wastewater treatment device according to claim 1, characterized in that: The anoxic stripping zone is provided with a gas diffusion device for providing power for the mud-water mixture.

6. A vertical denitrification sewage treatment device according to claim 1, characterized in that: The fourth inclined plate is inclined at an angle of 45° to 60° with respect to the horizontal direction, and the horizontal distance of the inclination of the fourth inclined plate is S≥C / 2 and S<C, wherein S represents the horizontal distance of the inclination of the inclined plate, and C represents the box width of the mud-water separation outer box.

7. A vertical denitrification wastewater treatment device according to claim 1, characterized in that: A sludge concentration zone is also arranged below the water distribution zone, and a sludge reflux channel is arranged at the bottom of the sludge concentration zone.

8. A vertical denitrification wastewater treatment device according to claim 1, characterized in that: The water flow rate of the cross section of the water inlet channel formed by the upper narrow spacing of the second sedimentation water inlet channel should be greater than or equal to 0.3m / s, and the water flow rate of the cross section of the lower wide first sedimentation water inlet channel should be less than 0.3m / s.

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

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