Uniform distribution denitrification system and process

Abstract

The invention discloses a uniform distribution denitrification system, which comprises an aeration tank, wherein an aerator is arranged in the aeration tank; the anoxic cylinders are uniformly distributed in the aeration tank, efficient fillers are arranged in the anoxic cylinders, water outlet distribution holes are formed in the bottoms of the anoxic cylinders, water inlets and water inlet degassing areas are formed in the top ends of the anoxic cylinders, and water inlet distribution holes are formed in the side parts of the tops of the anoxic cylinders; and the raw water inlet assembly is used for conveying raw water into the anoxic cylinder. The invention also discloses a uniform distribution denitrification process. Compared with the prior art, multi-point uniform distribution of raw water and rapid and uniform mixing in an anoxic zone formed by the anoxic cylinder can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a uniformly distributed denitrification system and process. Background Art

[0002] In the field of wastewater treatment, biological denitrification is a key link in maintaining the ecological balance of water bodies. The AO process, a widely used denitrification technology, operates on the principle of nitrification of ammonia nitrogen in an aerobic zone to produce nitrates. The nitrate-rich nitrified solution is then returned to the anoxic zone, where it utilizes the carbon source in the raw water for denitrification, thereby removing nitrogen. However, existing AO processes have significant technical limitations in practical applications: to ensure effective denitrification, the nitrified solution in the aerobic zone typically must be returned to the anoxic zone at a rate several times the influent flow rate. This reflux method can easily lead to uneven mixing within the anoxic zone. Specifically, in areas far from the interface between the influent and the refluxed nitrified solution, the raw water has a relatively abundant carbon source but a low nitrate supply. Near the interface, however, nitrate is enriched but the carbon source is scarce, resulting in a local imbalance in reaction conditions. To compensate for this shortcoming, existing technologies often adjust by increasing the nitrification liquid return flow or extending the mixing reaction time in the anoxic tank. This not only increases power consumption and infrastructure costs, but also may cause some sewage to enter the aerobic section before completing the denitrification reaction in the anoxic section due to insufficient mixing. This causes a large amount of carbon source to be directly oxidized and consumed without participating in the denitrification process, resulting in a waste of resources. In particular, for sewage treatment plants with insufficient influent carbon source, additional carbon source must be added to maintain denitrification efficiency, which further increases operating costs. At the same time, due to insufficient reaction, the denitrification effect is difficult to achieve the desired level, limiting the application of the process in efficient and economical denitrification scenarios. Summary of the Invention

[0003] The object of the present invention is to provide a uniformly distributed denitrification system and process, which can achieve uniform distribution of raw water at multiple points and rapid and uniform mixing in the anoxic zone formed by the anoxic cylinder.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions: A uniformly distributed denitrification system comprising: an aeration tank, wherein an aerator is provided in the aeration tank; Anoxic cylinders, multiple anoxic cylinders are evenly distributed in the aeration tank, the anoxic cylinders are filled with fillers, the bottom is provided with a water outlet distribution hole, the top is provided with a water inlet, and the side of the top is provided with a water inlet distribution hole; The raw water inlet assembly is used to transport raw water into the anoxic cylinder.

[0005] In a preferred embodiment, the filler is a biofilm filler in the form of suspended balls.

[0006] In a preferred embodiment, the top of the anoxic cylinder is provided with an air-water separation zone arranged around itself, and the water inlet distribution hole includes a first-level water inlet distribution hole and a second-level water inlet distribution hole. The first-level water inlet distribution hole is arranged on the outside of the air-water separation zone, connecting the aeration tank and the air-water separation zone, and the second-level water inlet distribution hole is arranged on the inside of the air-water separation zone, connecting the inside of the anoxic cylinder and the air-water separation zone.

[0007] In a preferred embodiment, the highest position of the distribution area of ​​the secondary water inlet and distribution holes is not higher than the lowest position of the distribution area of ​​the primary water inlet and distribution holes.

[0008] In a preferred embodiment, a spiral guide plate is provided in the gas-water separation zone, so that the gas-water separation zone forms a spiral channel.

[0009] In a preferred embodiment, a plurality of guide strips distributed obliquely and in parallel are provided on the outer side of the spiral guide plate, and at least one enlarged portion that enlarges toward both sides is provided on the guide strip. The positions of the enlarged portions provided on adjacent guide strips correspond to each other, and a narrow channel is formed between the two adjacent enlarged portions of the guide strips, and the other areas are wide channels, and an arc-shaped protrusion is provided in the wide channel.

[0010] In a preferred embodiment, the raw water inlet assembly includes an inlet channel and a water distribution pipe, a plurality of the water distribution pipes are connected to the inlet channel, and the water distribution pipes are provided with an inlet overflow weir corresponding to the position of the anoxic cylinder.

[0011] A uniformly distributed denitrification process, using the above-mentioned uniformly distributed denitrification system, includes the following steps: raw water is passed into a plurality of anoxic cylinders uniformly distributed in an aeration tank, mixed with the liquid flow input from the aeration tank in the anoxic cylinders, and enters the aeration tank through the water outlet distribution holes at the bottom of the anoxic cylinders.

[0012] In a preferred embodiment, the liquid flow in the aeration tank is subjected to gas-water separation before entering the anoxic cylinder, so that the oxygen content is reduced to below 0.5 mg / L.

[0013] In a preferred embodiment, the liquid flow in the aeration tank is subjected to gas-water separation by cyclone flow before entering the anoxic cylinder.

[0014] Compared with the prior art, the present invention has the following beneficial effects: during operation, the raw water The raw water is first precisely distributed through the raw water inlet assembly and delivered to the top inlet of each anoxic cylinder, achieving uniform distribution of the raw water across multiple points within the aeration tank. Simultaneously, aerators at the bottom of the aeration tank continuously aerate the water, forming an air-water mixture rich in dissolved oxygen and nitrates. This air-water mixture enters the anoxic cylinder through the water inlet distribution holes on the sides of the anoxic cylinder tops. The raw water entering the anoxic cylinder is thoroughly mixed with the nitrified solution after air-water separation. The packing inside the anoxic cylinder provides a rich attachment carrier for microorganisms, forming an anoxic microenvironment on the surface of the packing, which is conducive to the enrichment of short-range nitrification and denitrification bacteria. An anaerobic microenvironment forms within the packing, promoting the growth of anaerobic ammonium-oxidizing bacteria. As the mixed solution flows through the packing, the carbon source in the raw water and the nitrate in the nitrified solution undergo denitrification, short-range nitrification, and anaerobic ammonium oxidation reactions, respectively, in these different microenvironments, efficiently completing the conversion and removal of nitrogen.

[0015] Under the effect of density difference, the gas-water mixture outside the anoxic cylinder has a lower density due to its high gas content. The internal mixed liquid has a higher density due to its low gas content and rich reaction products. This density difference drives the mixed liquid downward along the anoxic cylinder, ultimately returning to the aeration tank through the outlet distribution hole at the bottom, forming a stable self-circulating system. The mixed liquid returning to the aeration tank again comes into contact with the gas-water mixture produced by the aerator, undergoing nitrification to produce nitrates. This nitrate then enters the anoxic cylinder through the inlet distribution hole to participate in denitrification. This cycle repeats, achieving continuous nitrogen removal.

[0016] This system uses multiple anoxic cylinders to be evenly distributed in the aeration tank, and cooperates with the raw water inlet components to Multi-point water distribution solves the problem of uneven mixing of nitrification liquid and raw water in traditional AO processes, allowing carbon sources and nitrates to fully contact at multiple reaction points, avoiding the phenomenon of local carbon source excess or nitrate deficiency. In particular, for wastewater with insufficient influent carbon source, efficient denitrification can be maintained without the need for a large amount of external carbon source. The filler in the anoxic cylinder can enrich denitrifying bacteria, short-range nitrifying bacteria, and anaerobic ammonia-oxidizing bacteria by constructing a diverse microenvironment, thereby broadening the denitrification path and improving denitrification efficiency. The self-circulating system formed based on density difference does not require a large-flow reflux pump, significantly reducing power consumption and operating costs. Overall, the system has achieved significant improvements in improving denitrification efficiency, reducing operating costs, and enhancing process stability through the synergistic effect of various technical features. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention relates to a plan layout diagram of a uniformly distributed denitrification system.

[0018] Figure 2 yes Figure 1 Cross-sectional view of AA in the figure.

[0019] Figure 3 The present invention relates to a partial structural schematic diagram of a uniformly distributed denitrification system in which a spiral guide plate is provided in a gas-water separation zone.

[0020] Figure 4 The present invention relates to a spiral guide plate, which is a schematic diagram of the front and side structures of a portion of the outer surface of the spiral guide plate.

[0021] In the picture Aeration tank 1; aerator 2; anoxic cylinder 3; outlet distribution hole 4; water inlet 5; air-water separation zone 6; primary inlet distribution hole 7; secondary inlet distribution hole 8; swirl guide plate 9; guide strip 10; expansion portion 11; narrow channel 12; wide channel 13; arc-shaped protrusion 14; inlet channel 15; distribution pipe 16; overflow weir 17. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings.

[0023] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

[0024] like Figures 1 to 4 As shown, a uniformly distributed denitrification system includes An aeration tank 1 is provided with an aerator 2; Anoxic cylinders 3, multiple anoxic cylinders 3 are evenly distributed in the aeration tank 1, the anoxic cylinders 3 are provided with fillers, the bottom is provided with a water outlet distribution hole 4, the top is provided with a water inlet 5, and the side of the top is provided with a water inlet distribution hole; The raw water inlet assembly is used to transport raw water into the anoxic cylinder 3 .

[0025] During the operation of the uniformly distributed denitrification system of this embodiment, the raw water first passes through the raw water The water inlet components are precisely distributed and delivered to the top water inlet 5 of each anoxic tube 3, achieving uniform distribution of raw water across multiple points within the aeration tank 1. Simultaneously, the aerator 2 at the bottom of the aeration tank 1 continuously aerates the water, forming an air-water mixture rich in dissolved oxygen and nitrates within the aeration tank 1. This air-water mixture enters the anoxic tube 3 through the water inlet distribution holes on the top side of the anoxic tube 3. The raw water entering the anoxic tube 3 is thoroughly mixed with the nitrified solution after air-water separation. The packing inside the anoxic tube 3 provides a rich attachment carrier for microorganisms, forming an anoxic microenvironment on the surface of the packing, which is conducive to the enrichment of short-range nitrification and denitrification bacteria. An anaerobic microenvironment is formed within the packing, promoting the growth of anaerobic ammonium-oxidizing bacteria. As the mixed solution flows through the packing, the carbon source in the raw water and the nitrate in the nitrified solution undergo denitrification, short-range nitrification, and anaerobic ammonium oxidation reactions, respectively, in different microenvironments, efficiently completing the conversion and removal of nitrogen.

[0026] Under the effect of density difference, the gas-water mixture outside the anoxic cylinder 3 has a high density due to its high gas content. The density of the mixed liquid inside the anoxic cylinder 3 is high due to its low gas content and rich reaction products. This density difference drives the mixed liquid downward along the interior of the anoxic cylinder 3, and eventually returns to the aeration tank 1 through the water outlet distribution hole 4 at the bottom, forming a stable self-circulating system. The mixed liquid returning to the aeration tank 1 again comes into contact with the gas-water mixture produced by the aerator 2, undergoing nitrification to produce nitrates. Subsequently, it enters the anoxic cylinder 3 through the water inlet distribution hole to participate in denitrification. This cycle repeats, achieving continuous nitrogen removal.

[0027] This system uses multiple anoxic cylinders 3 to be evenly distributed in the aeration tank 1, and cooperates with the raw water inlet group to The multi-point water distribution of the components solves the problem of uneven mixing of nitrification liquid and raw water in traditional AO processes, allowing the carbon source and nitrate to fully contact at multiple reaction points, avoiding the phenomenon of local carbon source excess or nitrate deficiency. In particular, for wastewater with insufficient influent carbon source, high-efficiency denitrification can be maintained without the need for a large amount of external carbon source. The filler in the anoxic cylinder 3 can enrich denitrification bacteria, short-range nitrification bacteria, and anaerobic ammonia-oxidizing bacteria by constructing a diverse microenvironment, thereby broadening the denitrification path and improving denitrification efficiency. The self-circulating system formed based on density difference does not require a high-flow reflux pump, significantly reducing power consumption and operating costs. Overall, through the synergistic effect of various technical features, the system has achieved significant improvements in improving denitrification efficiency, reducing operating costs, and enhancing process stability.

[0028] Furthermore, the filler adopts a biofilm filler and is arranged in the form of a suspended ball. The use of a biofilm filler and the arrangement in the form of a suspended ball can provide a broad and stable attachment carrier for microorganisms. Its large specific surface area can efficiently adsorb and carry water treatment-specific bacteria, significantly increasing the concentration of microorganisms. The suspended balls can move freely with the water flow and can fully contact with the sewage, avoiding the problem of local dead corners that are prone to fixed fillers and enhancing mass transfer efficiency. At the same time, the polyhedral structure of the suspended balls can construct a differentiated microenvironment. The surface forms an anoxic environment that is conducive to the activities of short-range nitrification and denitrification bacteria, while the interior forms an anaerobic environment suitable for the survival of anaerobic ammonia-oxidizing bacteria, allowing multiple denitrification reactions to proceed simultaneously, greatly improving the denitrification efficiency. In addition, the suspended form is easy to maintain, not easy to clog, and can maintain a stable treatment effect for a long time. It is especially adapted to the self-circulation characteristics of the system, further optimizing the denitrification performance.

[0029] Furthermore, the top of the anoxic cylinder 3 is provided with a surrounding gas-water separation zone 6. The water inlet distribution holes include a primary water inlet distribution hole 7 and a secondary water inlet distribution hole 8. The primary water inlet distribution hole 7 is located outside the gas-water separation zone 6, connecting the aeration tank 1 with the gas-water separation zone 6. The secondary water inlet distribution hole 8 is located inside the gas-water separation zone 6, connecting the interior of the anoxic cylinder 3 with the gas-water separation zone 6. The gas-water mixture (containing a large number of bubbles, high concentrations of nitrates, and a certain amount of dissolved oxygen) formed by aeration in the aeration tank 1 by the aerator 2 first enters the gas-water separation zone 6 uniformly through the primary water inlet distribution hole 7 located outside the gas-water separation zone 6. Once in this zone, the gas-water mixture is freed from aeration disturbance, and the bubbles in the gas-water mixture naturally rise and escape without external support, completing gas-liquid separation and significantly reducing the dissolved oxygen content in the remaining liquid to below 0.5 mg / L, forming a hypoxic liquid suitable for denitrification. Subsequently, the hypoxic liquid treated by gas-water separation flows smoothly into the anoxic cylinder 3 through the secondary water inlet distribution hole 8 on the inner side, and is fully mixed with the raw water entering from the top water inlet 5, providing a stable anoxic environment for the subsequent denitrification reaction.

[0030] Through the above technical settings, firstly, efficient gas-water separation is achieved through graded water distribution, and the dissolved oxygen concentration of the liquid entering the anoxic cylinder 3 is accurately controlled, so as to prevent the high-oxygen liquid in the aeration tank 1 from directly entering the anoxic zone and destroying the denitrification environment, thereby ensuring the activity of functional microorganisms such as denitrifying bacteria and anaerobic ammonia-oxidizing bacteria; secondly, the gas-water separation process does not require additional power equipment, and relies on the natural floating of bubbles to complete the separation, which cooperates with the self-circulation system driven by the density difference between the inside and outside of the anoxic cylinder 3 to reduce overall energy consumption; thirdly, the separated low-oxygen liquid carries high-concentration nitrate into the anoxic cylinder 3, and reacts efficiently with the carbon source in the raw water in the microenvironment constructed by the filler, greatly improving the nitrogen conversion efficiency, especially strengthening the synergistic effect of short-range nitrification-denitrification and anaerobic ammonia oxidation, and providing stable denitrification guarantee for wastewater treatment with insufficient carbon source.

[0031] Furthermore, the highest position of the distribution area of ​​the secondary water inlet distribution hole 8 is not higher than the lowest position of the distribution area of ​​the primary water inlet distribution hole 7. The highest position of the distribution area of ​​the secondary water inlet distribution hole 8 is not higher than the lowest position of the distribution area of ​​the primary water inlet distribution hole 7, which means that the secondary water distribution hole 8 is entirely below the primary water inlet distribution hole 7. After the gas-water mixture in the aeration tank 1 enters the gas-water separation zone 6 through the primary water inlet distribution hole 7, the bubbles will naturally float to the upper part of the separation zone due to their low density, while the liquid in the lower part will have a low gas content and less dissolved oxygen due to more complete bubble escape. This high-low position setting can ensure that the liquid entering the anoxic cylinder 3 comes from the fully separated low-oxygen area in the lower part of the separation zone, and completely avoids the high-oxygen liquid in the upper part that has not been completely separated from entering the anoxic cylinder 3 through the secondary water distribution hole, thereby stably maintaining the anoxic environment in the cylinder, providing reliable conditions for reactions such as denitrification and anaerobic ammonia oxidation, and ensuring denitrification efficiency.

[0032] In this embodiment, the gas-water separation zone 6 includes a vertical section and a conical section arranged at upper and lower positions. The first-level water inlet distribution hole 7 is arranged on the vertical section, and the lowest point of the second-level water inlet distribution hole 8 is higher than the bottom position of the conical section.

[0033] Furthermore, a spiral guide plate 9 is provided in the gas-water separation zone 6, forming a spiral channel in the gas-water separation zone 6. When the gas-water mixture in the aeration tank 1 enters the separation zone through the primary water inlet and distribution hole 7, it rotates along the spiral channel. Under the action of centrifugal force, bubbles with a density much smaller than that of the liquid are pushed toward the inside of the channel and float upward to escape, while the liquid with a low gas content flows along the outside of the channel. At the same time, the spiral flow extends the path and residence time of the gas-water mixture in the separation zone. Combined with the channel structure's guidance of the water flow, it can break the bubble aggregation state, making it easier for tiny bubbles to separate from the liquid phase and prevent them from entering the anoxic cylinder 3 with the liquid.

[0034] Furthermore, the outer side of the spiral guide plate 9 is provided with a plurality of inclined parallel guide strips 10. Each guide strip 10 is provided with at least one expanded portion 11 that expands toward both sides. The expanded portions 11 provided on adjacent guide strips 10 are positioned correspondingly. In two adjacent guide strips 10, a narrow channel 12 is formed between the two adjacent expanded portions 11, and the remaining area is a wide channel 13. Each wide channel 13 is provided with an arc-shaped protrusion 14. The inclination angle provides a directional upward driving force for the gas-water mixture near the inner side of the spiral channel, accelerating the upward floating trend of bubbles, prompting the gas to escape from the liquid phase more quickly, and strengthening the active guidance effect of gas-water separation. The corresponding expansions 11 on adjacent guide strips 10 form alternating narrow channels 12 and wide channels 13. As the gas-water mixture flows through, it is squeezed in the narrow channel 12 due to spatial compression, causing tiny bubbles to collide and fuse into larger bubbles, enhancing their buoyancy. Upon entering the wide channel 13, the space suddenly expands, reducing liquid pressure and allowing the fused bubbles to rapidly expand and rise. This alternating "squeeze-and-expand" effect significantly improves the separation efficiency of bubbles and liquid, further reducing the dissolved oxygen content in the liquid. The arc-shaped protrusions 14 within the wide channel 13 redirect the local water flow, directing the gas-water mixture near the inner wall of the spiral channel toward the middle of the channel. This prevents the formation of a retained coating due to adhesion to the inner wall, which would otherwise obstruct the bubble's upward path and the liquid's flow rate, ensuring efficient flow and separation throughout the spiral channel. These structures work together to significantly improve the thoroughness and stability of gas-water separation without increasing power consumption, making the dissolved oxygen concentration of the liquid entering the anoxic cylinder 3 lower and more uniform, providing a better microenvironment for denitrification, anaerobic ammonia oxidation and other reactions in the packing area, and further enhancing the system's denitrification efficiency and operational stability.

[0035] Furthermore, the raw water inlet assembly includes an inlet channel 15 and a distribution pipe 16, and a plurality of the distribution pipes 16 are connected to the inlet channel 15. The distribution pipes 16 are provided with an inlet overflow weir 17 corresponding to the position of the anoxic cylinder 3. The inlet channel 15 receives the raw water and distributes it evenly to the plurality of distribution pipes 16. The inlet overflow weir 17 on the distribution pipe 16 corresponds to the anoxic cylinder 3 one by one. When the raw water flows through the distribution pipe 16, the overflow weir 17 automatically controls the water inlet volume through the liquid level difference, ensuring that each anoxic cylinder 3 obtains an equal amount of raw water, avoiding uneven distribution from the source. This design can buffer water inlet fluctuations, maintain consistent water inlet loads for each cylinder, and evenly mix the raw water carbon source and nitrification solution in each anoxic cylinder 3, thereby improving the carbon source utilization rate and reducing the consumption of external carbon sources.

[0036] Example 2: like Figures 1 to 4As shown, a uniformly distributed denitrification process, using the uniformly distributed denitrification system described in Example 1, includes the following steps: passing raw water into a plurality of anoxic cylinders 3 uniformly distributed in the aeration tank 1, mixing with the liquid flow input from the aeration tank 1 in the anoxic cylinders 3, and entering the aeration tank 1 through the water outlet distribution holes 4 at the bottom of the anoxic cylinders 3. By passing the raw water into multiple anoxic cylinders 3 evenly distributed in the aeration tank 1, multi-point uniform distribution of the raw water is achieved, which facilitates uniform mixing and full contact of the nitrifying liquid and the carbon source in the raw water, and solves the problem of local imbalance of carbon source and nitrate caused by uneven mixing in the traditional process; in the anoxic cylinder 3, the raw water is mixed with the liquid flow input from the aeration tank 1, and the various microenvironment spaces constructed by the environment and fillers in the anoxic cylinder 3 can simultaneously achieve short-range nitrification, denitrification and anaerobic ammonia oxidation reactions, which is particularly beneficial for denitrification treatment of wastewater with insufficient influent carbon source; the mixed water enters the aeration tank 1 through the water outlet distribution hole 4 at the bottom of the anoxic cylinder 3, and forms an internal and external liquid circulation with the help of the density difference between the sewage inside and outside the anoxic cylinder 3, without the need to set a large-flow reflux pump in the aeration tank 1, thereby reducing power consumption; the entire process makes full use of the system structure characteristics to make the denitrification reaction efficient, thereby improving the practicality and economy of the process. Furthermore, the liquid flow in the aeration tank 1 undergoes gas-water separation before entering the anoxic cylinder 3, reducing the oxygen content to below 0.5 mg / L. This creates a stable anoxic environment within the anoxic cylinder 3. This process avoids the problem of suppressing the activity of denitrifying bacteria caused by the direct entry of high-oxygen liquid flow, ensuring the orderly progress of short-range nitrification, denitrification, and anaerobic ammonium oxidation reactions. At the same time, the low-oxygen environment and the filler microenvironment work together to enhance the efficient utilization of carbon sources under anoxic conditions, especially in scenarios where the influent carbon source is insufficient, allowing for a more complete denitrification reaction.

[0037] Before entering the anoxic cylinder 3, the liquid in the aeration tank 1 undergoes cyclonic separation, accelerating the gas-liquid separation process with centrifugal force. The centrifugal action of the cyclonic flow causes low-density bubbles to gather toward the center and quickly rise and escape, effectively reducing the oxygen content in the liquid and ensuring that the liquid entering the anoxic cylinder 3 meets the requirements of an anoxic environment.

[0038] It should be noted that, in this document, relational terms such as first and second, etc., are used solely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "include," "comprise," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or terminal device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or terminal device. Without further limitation, elements defined by the phrase "include..." or "comprising..." do not exclude the presence of additional elements in the process, method, article, or terminal device comprising the elements. Furthermore, in this document, "greater than," "less than," "exceeding," etc., are understood to exclude the number itself; "above," "below," "within," etc., are understood to include the number itself.

[0039] The above description of the embodiments is intended to facilitate understanding and application of the present invention by those skilled in the art. It is apparent that those skilled in the art can readily make various modifications to the embodiments and apply the general principles described herein to other embodiments without requiring creative effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A uniformly distributed denitrification system, characterized in that: include: an aeration tank, wherein an aerator is provided in the aeration tank; Anoxic cylinders, multiple anoxic cylinders are evenly distributed in the aeration tank, the anoxic cylinders are filled with fillers, the bottom is provided with a water outlet distribution hole, the top is provided with a water inlet, and the side of the top is provided with a water inlet distribution hole; The raw water inlet assembly is used to transport raw water into the anoxic cylinder.

2. A uniformly distributed denitrification system according to claim 1, characterized in that: The filler is a biofilm filler, which is arranged in a suspended ball form.

3. A uniformly distributed denitrification system according to claim 1, characterized in that: The top of the anoxic cylinder is provided with an air-water separation zone arranged around itself, and the water inlet distribution hole includes a primary water inlet distribution hole and a secondary water inlet distribution hole. The primary water inlet distribution hole is arranged on the outside of the air-water separation zone, connecting the aeration tank and the air-water separation zone, and the secondary water inlet distribution hole is arranged on the inside of the air-water separation zone, connecting the inside of the anoxic cylinder and the air-water separation zone.

4. A uniformly distributed denitrification system according to claim 3, characterized in that: The highest position of the distribution area of ​​the secondary water inlet and distribution holes is not higher than the lowest position of the distribution area of ​​the primary water inlet and distribution holes.

5. A uniformly distributed denitrification system according to claim 3, characterized in that: A spiral guide plate is provided in the gas-water separation zone, so that the gas-water separation zone forms a spiral channel.

6. A uniformly distributed denitrification system according to claim 5, characterized in that: The outer side of the spiral guide plate is provided with a plurality of guide strips distributed in parallel and inclined, and the guide strip is provided with at least one enlarged portion that enlarges toward both sides. The positions of the enlarged portions provided on adjacent guide strips correspond to each other. In two adjacent guide strips, a narrow channel is formed between the two adjacent enlarged portions, and the other areas are wide channels, and an arc-shaped protrusion is provided in the wide channel.

7. The uniformly distributed denitrification system according to claim 1, characterized in that: The raw water inlet assembly includes an inlet channel and a water distribution pipe. A plurality of the water distribution pipes are connected to the inlet channel. The water distribution pipes are provided with inlet overflow weirs corresponding to the positions of the anoxic cylinders.

8. A uniformly distributed denitrification process, characterized in that: The uniformly distributed denitrification system according to any one of claims 1 to 7 comprises the steps of: passing raw water into a plurality of anoxic cylinders uniformly distributed in the aeration tank, mixing the raw water with the liquid flow input from the aeration tank in the anoxic cylinders, and entering the aeration tank through the water outlet distribution holes at the bottom of the anoxic cylinders.

9. A uniformly distributed denitrification process according to claim 8, characterized in that: Before the liquid flow in the aeration tank enters the anoxic cylinder, it is separated into gas and water to reduce the oxygen content to below 0.5 mg / L.

10. A uniformly distributed denitrification process according to claim 8, characterized in that: The liquid flow in the aeration tank is separated into gas and water through cyclone before entering the anoxic cylinder.

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