A uniform distribution denitrification system and process

Abstract

The application discloses a uniform distribution denitrification system, which comprises an aeration tank, wherein an aerator is arranged; a plurality of anoxic cylinders are uniformly arranged in the aeration tank, wherein high-efficiency fillers are arranged in the anoxic cylinders, a water outlet distribution hole is arranged at the bottom of the anoxic cylinder, a water inlet and a water inlet degassing area are arranged at the top end of the anoxic cylinder, and a water inlet distribution hole is arranged at the side of the top of the anoxic cylinder; and a raw water inlet assembly is arranged and used for conveying raw water into the anoxic cylinder. The application further discloses a uniform distribution denitrification process. Compared with the prior art, the application can realize uniform distribution of raw water at multiple points and rapid and uniform mixing in the anoxic area formed by the anoxic cylinder.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a uniformly distributed denitrification system and process. Background Technology

[0002] In wastewater treatment, biological nitrogen removal is a crucial step in maintaining the ecological balance of aquatic bodies. The aerobic-oxidative (AO) process, a widely used nitrogen removal technology, works by nitrifying ammonia nitrogen in an aerobic zone to produce nitrates. The nitrate-rich nitrified liquor is then recirculated to an anoxic zone, where it undergoes denitrification using carbon sources from the raw water, thus removing nitrogen. However, existing AO processes have significant technical limitations in practical applications: to ensure effective denitrification, several times the influent flow rate of the nitrified liquor from the aerobic zone is typically recirculated to the anoxic zone. This recirculation method easily leads to uneven mixing within the anoxic zone. Specifically, in areas far from the interface between the influent and the recirculated nitrified liquor, the raw water has relatively abundant carbon sources but insufficient nitrate supply, while near the interface, nitrate accumulates while carbon sources are scarce, creating a local imbalance in reaction conditions. To compensate for this deficiency, existing technologies often adjust by increasing the nitrification liquor return flow rate or extending the mixing reaction time in the anoxic tank. This not only increases power consumption and infrastructure costs but may also lead to insufficient mixing, causing some wastewater to enter the aerobic zone before completing the denitrification reaction. This results in a large amount of carbon source being directly oxidized and consumed without participating in the nitrogen removal process, leading to resource waste. Especially for wastewater treatment plants with insufficient influent carbon sources, additional carbon sources need to be added to maintain denitrification efficiency, which further increases operating costs. At the same time, the incomplete reaction makes it difficult to achieve the ideal nitrogen removal effect, limiting the application of the process in efficient and economical nitrogen removal scenarios. Summary of the Invention

[0003] The purpose of this 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 within the anoxic zone formed by the anoxic tank.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0005] A uniformly distributed nitrogen removal system, comprising:

[0006] An aeration tank, wherein an aerator is provided in the aeration tank;

[0007] Anoxic cylinders, multiple anoxic cylinders are evenly distributed in the aeration tank. Each anoxic cylinder is filled with packing material, has a water outlet at the bottom, a water inlet at the top, and a water inlet at the side of the top.

[0008] The raw water inlet assembly is used to deliver raw water into the anoxic cylinder.

[0009] In a preferred embodiment, the filler is a biofilm filler arranged in the form of a suspended ball.

[0010] In a preferred embodiment, the top of the anoxic cylinder is provided with a gas-water separation zone arranged around itself, the water inlet distribution holes include primary water inlet distribution holes and secondary water inlet distribution holes, the primary water inlet distribution holes are arranged outside the gas-water separation zone and communicate the aeration tank and the gas-water separation zone, and the secondary water inlet distribution holes are arranged inside the gas-water separation zone and communicate the inside of the anoxic cylinder and the gas-water separation zone.

[0011] In a preferred embodiment, the highest position of the distribution area of the secondary water inlet distribution holes is not higher than the lowest position of the distribution area of the primary water inlet distribution holes.

[0012] In a preferred embodiment, a spiral flow guide plate is arranged in the gas-water separation zone, so that the gas-water separation zone forms a spiral channel.

[0013] In a preferred embodiment, the outer side of the spiral flow guide plate is provided with a plurality of inclined and parallel distributed flow guide strips, at least one bulging part is arranged on each flow guide strip, the positions of the bulging parts arranged on adjacent flow guide strips correspond to each other, a narrow channel is formed between adjacent bulging parts in adjacent two flow guide strips, and wide channels are formed in other areas, and arc-shaped protrusions are arranged in the wide channels.

[0014] In a preferred embodiment, the raw water inlet assembly includes an inlet channel and a plurality of distribution pipes, the plurality of distribution pipes are connected to the inlet channel, and water inlet overflow weirs are arranged on the distribution pipes in one-to-one correspondence with the positions of the anoxic cylinders.

[0015] A uniform distribution denitrification process using the uniform distribution denitrification system, including the steps of: introducing raw water into a plurality of anoxic cylinders uniformly distributed in an aeration tank, mixing the raw water with a liquid stream input from the aeration tank in the anoxic cylinders, and introducing the raw water into the aeration tank through water outlet distribution holes at the bottom of the anoxic cylinders.

[0016] In a preferred embodiment, the liquid stream 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.

[0017] In a preferred embodiment, the liquid stream in the aeration tank is subjected to gas-water separation by cyclone before entering the anoxic cylinder.

[0018] Compared with the prior art, the present application has the following beneficial effects: during operation, the raw water is first subjected to gas-water separation in the gas-water separation zone, so that the oxygen content is reduced to below 0.5 mg / L, and then the raw water is introduced into the anoxic cylinder, so that the raw water is subjected to denitrification in the anoxic cylinder, and then the denitrified water is introduced into the aeration tank, so that the denitrified water is subjected to nitrification and denitrification in the aeration tank.

[0019] First, the raw water is precisely distributed and delivered to the top inlets of each anoxic tank via the raw water inlet assembly, achieving uniform distribution of raw water across multiple points within the aeration tank. Simultaneously, aerators at the bottom of the aeration tank continuously aerate the water, creating a gas-water mixture rich in dissolved oxygen and nitrates. This gas-water mixture enters the anoxic tank through the water inlet distribution holes on the top side. The raw water entering the anoxic tank mixes thoroughly with the nitrified liquid after gas-water separation. The packing material inside the anoxic tank provides a rich attachment carrier for microorganisms, creating an anoxic microenvironment on the surface of the packing material, which is conducive to the enrichment of short-cut nitrification and denitrification bacteria. Inside the packing material, an anaerobic microenvironment is formed, promoting the growth of anaerobic ammonia-oxidizing bacteria. As the mixed liquor flows through the packing material, the carbon source in the raw water and the nitrates in the nitrified liquid undergo denitrification, short-cut nitrification, and anaerobic ammonia oxidation reactions in different microenvironments, efficiently completing the conversion and removal of nitrogen.

[0020] Due to the density difference, the gas-water mixture outside the anoxic cylinder has a lower density because of its higher gas content.

[0021] The internal mixed liquor has a high density due to its low gas content and high concentration of reaction products. This density difference drives the mixed liquor to flow downwards along the inside of the anoxic tank, eventually returning to the aeration tank through the bottom outlet water distribution hole, forming a stable self-circulating system. The mixed liquor returning to the aeration tank comes into contact with the gas-water mixture generated by the aerator again, undergoing a nitrification reaction to produce nitrates. It then enters the anoxic tank through the inlet water distribution hole to participate in denitrification, thus continuously achieving nitrogen removal.

[0022] This system utilizes multiple anoxic cartridges evenly distributed within the aeration tank, in conjunction with the raw water inlet assembly.

[0023] Multi-point water distribution solves the problem of uneven mixing between nitrifying liquor and raw water in traditional AO processes, ensuring sufficient contact between carbon source and nitrate at multiple reaction points. This avoids localized carbon source excess or nitrate deficiency, especially for wastewater with insufficient influent carbon source, eliminating the need for large amounts of external carbon source to maintain efficient denitrification. The packing material within the anoxic tank creates diverse microenvironments, simultaneously enriching denitrifying bacteria, short-cut nitrifying bacteria, and anaerobic ammonia oxidizing bacteria, broadening the denitrification pathway and improving denitrification efficiency. Furthermore, the self-circulating system based on density differences eliminates the need for a large-flow return pump, significantly reducing power consumption and operating costs. Overall, through the synergistic effect of its various technical features, this system achieves significant improvements in denitrification efficiency, reduced operating costs, and enhanced process stability. Attached Figure Description

[0024] Figure 1 This invention relates to a planar layout diagram of a uniformly distributed denitrification system.

[0025] Figure 2 yes Figure 1Sectional view of AA.

[0026] Figure 3 This invention relates to a partial structural diagram of a gas-liquid separation zone of a uniformly distributed denitrification system after a spiral guide plate has been installed.

[0027] Figure 4 This invention relates to a schematic diagram of the front and side structures of a portion of the outer surface of a spiral guide plate.

[0028] In the picture

[0029] 1. Aeration tank; 2. Aerator; 3. Anoxic cylinder; 4. Water outlet; 5. Water inlet; 6. Air-water separation zone; 7. Primary water inlet; 8. Secondary water inlet; 9. Swirl guide plate; 10. Guide strip; 11. Expansion section; 12. Narrow channel; 13. Wide channel; 14. Arc-shaped protrusion; 15. Water inlet channel; 16. Water distribution pipe; 17. Overflow weir. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings.

[0031] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0032] like Figures 1 to 4 As shown, a uniformly distributed denitrification system includes...

[0033] Aeration tank 1, wherein an aerator 2 is provided in the aeration tank 1;

[0034] Anoxic cylinder 3, multiple anoxic cylinders 3 are evenly distributed in the aeration tank 1. The anoxic cylinder 3 is filled with packing material, and has a water outlet 4 at the bottom, a water inlet 5 at the top, and a water inlet 5 at the side of the top.

[0035] The raw water inlet assembly is used to deliver raw water into the anoxic cylinder 3.

[0036] In this embodiment of a uniformly distributed denitrification system, during operation, the raw water first passes through the raw water...

[0037] The inlet components are precisely distributed and delivered to the top inlet 5 of each anoxic tank 3, achieving uniform distribution of raw water at multiple points within the aeration tank 1. Simultaneously, the aerators 2 at the bottom of the aeration tank 1 continuously aerate the water, creating a gas-water mixture rich in dissolved oxygen and nitrates. This gas-water mixture enters the anoxic tank 3 through the water inlet distribution hole on the top side. The raw water entering the anoxic tank 3 mixes thoroughly with the nitrified liquid after gas-water separation within the tank. The packing material filling the anoxic tank 3 provides a rich attachment carrier for microorganisms. An anoxic microenvironment is formed on the surface of the packing material, which is conducive to the enrichment of short-cut nitrification and denitrification bacteria. An anaerobic microenvironment is formed inside the packing material, promoting the growth of anaerobic ammonia oxidizing bacteria. As the mixed liquor flows through the packing material, the carbon source in the raw water and the nitrate in the nitrified liquid undergo denitrification, short-cut nitrification, and anaerobic ammonia oxidation reactions in different microenvironments, efficiently completing the conversion and removal of nitrogen.

[0038] Due to the density difference, the gas-water mixture outside the anoxic cylinder 3 has a higher density because of its higher gas content.

[0039] The internal mixed liquor has a high density due to its low gas content and high concentration of reaction products. This density difference drives the mixed liquor to flow downwards along the inside of the anoxic cylinder 3, eventually returning to the aeration tank 1 through the bottom water outlet 4, forming a stable self-circulating system. The mixed liquor returning to the aeration tank 1 comes into contact with the gas-water mixture generated by the aerator 2 again, undergoing a nitrification reaction to produce nitrates. Subsequently, it enters the anoxic cylinder 3 through the water inlet 4 to participate in denitrification, thus continuously achieving nitrogen removal.

[0040] This system utilizes multiple anoxic cylinders 3 evenly distributed within the aeration tank 1, in conjunction with the raw water inlet assembly.

[0041] The multi-point water distribution system solves the problem of uneven mixing between nitrifying liquor and raw water in traditional AO processes, ensuring sufficient contact between carbon source and nitrate at multiple reaction points. This avoids localized carbon source excess or nitrate deficiency, especially for wastewater with insufficient influent carbon source, maintaining high-efficiency denitrification without the need for large amounts of external carbon source. The packing material inside the anoxic tank 3 can create diverse microenvironments, simultaneously enriching denitrifying bacteria, short-range nitrifying bacteria, and anaerobic ammonia oxidizing bacteria, broadening the denitrification pathway and improving denitrification efficiency. Furthermore, the self-circulating system based on density difference eliminates the need for a large-flow return pump, significantly reducing power consumption and operating costs. In summary, through the synergistic effect of its various technical features, this system achieves significant improvements in denitrification efficiency, reduced operating costs, and enhanced process stability.

[0042] Further, the filler adopts a biofilm filler and is arranged in a suspended spherical form. The biofilm filler arranged in a suspended spherical form can provide a wide and stable adhesion carrier for microorganisms, and the large specific surface area can efficiently adsorb and carry water treatment specific bacteria, thereby significantly improving the concentration of microorganisms. The suspended ball can freely move with the water flow, can fully contact with the sewage, avoids the local dead angle problem of fixed filler, and enhances the mass transfer efficiency. At the same time, the polyhedral structure of the suspended ball can construct a differentiated microenvironment, and the surface forms an anoxic environment conducive to the activities of short-cut nitrification and denitrification bacteria, and the inside forms an anaerobic environment suitable for the survival of anaerobic ammonia oxidation bacteria, so that various denitrification reactions are carried out simultaneously, and the denitrification efficiency is greatly improved. In addition, the suspended form is easy to maintain and not easy to block, and can maintain stable treatment effect for a long time, especially suitable for the system self-circulation characteristics, further optimizing the denitrification performance.

[0043] Further, the top of the anoxic cylinder 3 is provided with a gas-water separation zone 6 arranged around itself, the water inlet distribution holes include a first water inlet distribution hole 7 and a second water inlet distribution hole 8, the first water inlet distribution hole 7 is arranged outside the gas-water separation zone 6, and is connected with the aeration tank 1 and the gas-water separation zone 6, and the second water inlet distribution hole 8 is arranged inside the gas-water separation zone 6, and is connected with the inside of the anoxic cylinder 3 and the gas-water separation zone 6. The gas-water mixture (containing a large number of bubbles, high concentration of nitrate and a certain amount of dissolved oxygen) formed by the aerator 2 in the aeration tank 1 is first evenly introduced into the gas-water separation zone 6 through the first water inlet distribution hole 7 arranged outside the gas-water separation zone 6. After entering this area, the gas bubbles in the gas-water mixture lose external support and naturally rise and escape, completing gas-liquid separation, so that the dissolved oxygen content in the remaining liquid is greatly reduced to below 0.5 mg / L, forming a low-oxygen liquid suitable for denitrification reaction. Subsequently, the low-oxygen liquid treated by gas-water separation flows into the inside of the anoxic cylinder 3 through the second water inlet distribution hole 8 on the inside, and is fully mixed with the raw water entering from the top water inlet 5, to provide a stable anoxic environment for the subsequent denitrification reaction.

[0044] Through the above technical arrangement, first, the hierarchical water distribution realizes efficient gas-water separation, accurately controls the dissolved oxygen concentration of the liquid entering the anoxic cylinder 3, avoids the high-oxygen liquid in the aeration tank 1 directly entering the anoxic zone to destroy the denitrification environment, and ensures the activity of functional microorganisms such as denitrifying bacteria and anaerobic ammonia oxidation bacteria; second, the gas-water separation process does not require additional power equipment, relies on the natural floating of bubbles to complete the separation, and cooperates with the self-circulation system driven by the density difference inside and outside the anoxic cylinder 3, thereby reducing the overall energy consumption; third, the low-oxygen liquid after separation carries high-concentration nitrate into the anoxic cylinder 3, and the carbon source in the raw water reacts efficiently in the microenvironment constructed by the filler, thereby greatly improving the nitrogen element conversion efficiency, especially strengthening the synergistic effect of short-cut nitrification-denitrification and anaerobic ammonia oxidation, and providing stable denitrification guarantee for wastewater treatment with insufficient carbon source.

[0045] Further, 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 inlet 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 gas bubbles will naturally float to the upper part of the separation zone due to their small density, and the liquid in the lower part will have low gas content and low dissolved oxygen due to the more sufficient escape of gas bubbles. This high-low position setting can ensure that the liquid entering the anoxic cylinder 3 comes from the low-oxygen area in the lower part of the separation zone after sufficient separation, completely avoiding the high-oxygen liquid in the upper part entering the anoxic cylinder 3 through the secondary water inlet distribution hole, thereby stably maintaining the anoxic environment in the cylinder, providing reliable conditions for denitrification and anaerobic ammonia oxidation reactions, and ensuring denitrification efficiency.

[0046] In the present embodiment, the gas-water separation zone 6 includes a vertical section and a conical section arranged in an upper-lower position, the primary water inlet distribution hole 7 is arranged on the vertical section, and the lowest point of the secondary water inlet distribution hole 8 is higher than the bottom position of the conical section.

[0047] Further, the gas-water separation zone 6 is provided with a spiral guide plate 9, so that the gas-water separation zone 6 forms a spiral channel. When the gas-water mixture in the aeration tank 1 enters the separation zone through the primary water inlet distribution hole 7, it will flow in a spiral manner along the spiral channel, and under the action of centrifugal force, the gas bubbles with a density much smaller than the liquid will be pushed to the inside of the channel and float out, while the liquid with low gas content will flow along the outside of the channel. At the same time, the spiral flow prolongs the path and residence time of the gas-water mixture in the separation zone, and in combination with the guidance of the channel structure to the water flow, it can break the aggregation state of the gas bubbles, making it easier for small gas bubbles to separate from the liquid phase and avoid entering the anoxic cylinder 3 with the liquid.

[0048] Further, the outer side of the spiral guide plate 9 is provided with a plurality of inclined parallel distribution guide strips 10, at least one bulging part 11 is arranged on the guide strip 10, the positions of the bulging parts 11 arranged on adjacent guide strips 10 correspond to each other, between the two adjacent bulging parts 11 of the two adjacent guide strips 10, a narrow channel 12 is formed, and other regions are wide channels 13, and arc-shaped protrusions 14 are arranged in the wide channels 13. The self-inclined angle of the guide strip 10 provides a directional upward driving force for the gas-water mixture close to the inner side of the spiral channel, accelerates the upward floating trend of the gas bubbles, promotes the gas to escape from the liquid phase more quickly, and strengthens the active guiding effect of gas-water separation. The bulging parts 11 arranged on the adjacent guide strips 10 correspond to each other, forming alternating narrow channels 12 and wide channels 13, when the gas-water mixture flows through, the narrow channel 12 is compressed due to space compression, which promotes the collision and fusion of micro-bubbles into large bubbles, improving the upward floating capacity; after entering the wide channel 13, the space expands suddenly, the liquid pressure decreases, and the fused bubbles can expand quickly and accelerate upward, through the alternating action of "compression-expansion", the separation efficiency of bubbles and liquid is greatly improved, and the dissolved oxygen content in the liquid is further reduced. The arc-shaped protrusions 14 in the wide channel 13 can change the local water flow direction, guide the gas-water mixture close to the inner wall of the spiral channel to the middle region of the channel, avoid the formation of a stagnant attached layer due to adhesion to the inner wall, prevent the attached layer from hindering the upward path of the bubbles and the flow speed of the liquid, and ensure that the gas-water mixture in the entire spiral channel can maintain a high-efficiency flow and separation state. The synergistic effect of these structures significantly improves the thoroughness and stability of gas-water separation without increasing power consumption, so that the liquid entering the anoxic cylinder 3 has a lower and more uniform dissolved oxygen concentration, providing a more optimal microenvironment for denitrification, anaerobic ammonia oxidation and other reactions in the filler area, further enhancing the system denitrification efficiency and operation stability.

[0049] Further, the raw water inlet assembly includes an inlet channel 15 and a water distribution pipe 16, a plurality of water distribution pipes 16 are connected to the inlet channel 15, and a water inlet overflow weir 17 is arranged on each water distribution pipe 16 corresponding to the position of the anoxic cylinder 3. The inlet channel 15 receives raw water and evenly distributes it to the plurality of water distribution pipes 16, and the water inlet overflow weir 17 on the water distribution pipe 16 corresponds to each anoxic cylinder 3. When the raw water flows through the water distribution pipe 16, the overflow weir 17 automatically regulates the water inlet amount through the liquid level difference, ensuring that each anoxic cylinder 3 obtains an equal amount of raw water and avoiding uneven distribution from the source. This design can buffer the water inlet fluctuation, maintain consistent water inlet load for each cylinder, evenly mix the raw water carbon source and nitrated liquid in each anoxic cylinder 3, improve the carbon source utilization rate, and reduce the consumption of additional carbon source.

[0050] Example two:

[0051] As Figures 1 to 4As shown, a uniform distribution denitrification process applies the uniform distribution denitrification system described in embodiment one, including the steps of: passing raw water into a plurality of anoxic cylinders 3 uniformly distributed in the aeration tank 1, mixing with the liquid stream input from the aeration tank 1 in the anoxic cylinder 3, and entering the aeration tank 1 through the water outlet distribution hole 4 at the bottom of the anoxic cylinder 3. By passing raw water into a plurality of anoxic cylinders 3 uniformly distributed in the aeration tank 1, the raw water is evenly distributed at multiple points, facilitating uniform and sufficient mixing of nitrification liquid and carbon source in raw water, and solving the problem of local imbalance between carbon source and nitrate caused by uneven mixing in traditional processes. In the anoxic cylinder 3, raw water is mixed with the liquid stream input from the aeration tank 1, and the environment in the anoxic cylinder 3 and the multiple micro-environment spaces formed by the filler structure can simultaneously realize short-cut nitrification, denitrification and anaerobic ammonia oxidation, especially beneficial for denitrification treatment of wastewater with insufficient carbon source in influent. The mixed water enters the aeration tank 1 through the water outlet distribution hole 4 at the bottom of the anoxic cylinder 3, and the density difference between the wastewater inside and outside the anoxic cylinder 3 forms an internal and external liquid circulation, eliminating the need for a large flow reflux pump in the aeration tank 1, reducing power consumption. The entire process fully utilizes the structural characteristics of the system to make the denitrification reaction efficient, improving the practicality and economy of the process.

[0052] Further, the liquid stream in the aeration tank 1 is separated from the gas before entering the anoxic cylinder 3, reducing the oxygen content to below 0.5 mg / L. This creates a stable anoxic environment in the anoxic cylinder 3. This process avoids the problem of denitrifying bacteria activity being inhibited by high-oxygen liquid flow directly entering, ensuring that short-cut nitrification, denitrification and anaerobic ammonia oxidation reactions proceed in an orderly manner. At the same time, the low-oxygen environment cooperates with the filler micro-environment to enhance the efficient use of carbon sources under anoxic conditions, especially suitable for scenarios with insufficient carbon source in the influent, making the denitrification reaction more complete.

[0053] The liquid stream in the aeration tank 1 is separated from the gas by cyclone before entering the anoxic cylinder 3. The centrifugal force accelerates the gas-liquid separation process. The centrifugal action of cyclone causes the gas bubbles with small density to gather towards the center and quickly float out, efficiently reducing the oxygen content in the liquid stream, ensuring that the liquid stream entering the anoxic cylinder 3 meets the anoxic environment requirements.

[0054] It is to be noted that, as used in this document, the terms "a", "an", and "the" are not intended to be limiting in any way. Specifically, these terms should be interpreted as referring to one or more instances of the entity or action in question. Furthermore, the terms "comprising", "including", and "containing" are to be construed as open-ended terms (i.e., meaning "including, but not limited to,") unless otherwise noted. It is intended that the application encompassing alternate steps and / or implementations as can be drawn to or adapted by a person skilled in the art from the disclosure of the application.

[0055] The foregoing description of the exemplary embodiments is presented for the purpose of illustration and description. It is not intended to be exhaustive or to limit the application to the precise form disclosed. Modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to provide the best illustration of the principles of the application and its practical application. This description is not to be construed as limiting the scope of the application. Other embodiments can be derived from this description by those skilled in the art, such other embodiments being considered within the scope of the application.

Claims

1. A uniform distribution denitrification system, characterized by, The application relates to a uniform distribution denitrification system. An aeration tank is provided with an aerator; A plurality of anoxic cylinders are uniformly distributed in the aeration tank, and the anoxic cylinders are provided with fillers, water outlet distribution holes at the bottom, water inlet ports at the top, and water inlet distribution holes at the side of the top. A raw water inlet assembly is used for conveying raw water into the anoxic cylinders. The top of the anoxic cylinder is provided with a gas-water separation zone around itself, the water inlet distribution holes include primary water inlet distribution holes and secondary water inlet distribution holes, the primary water inlet distribution holes are arranged outside the gas-water separation zone and are connected with the aeration tank and the gas-water separation zone, and the secondary water inlet distribution holes are arranged inside the gas-water separation zone and are connected with the inside of the anoxic cylinder and the gas-water separation zone. The gas-water separation zone is provided with a spiral guide plate, so that the gas-water separation zone forms a spiral channel. The outside of the spiral guide plate is provided with a plurality of inclined and parallel guide strips, at least one bulging part is arranged on each guide strip, the positions of the bulging parts arranged on adjacent guide strips correspond to each other, narrow channels are formed between adjacent bulging parts in adjacent two guide strips, wide channels are formed in other regions, and arc-shaped protrusions are arranged in the wide channels.

2. The uniform distribution denitrification system of claim 1, wherein, The fillers are biological membrane fillers and are arranged in a suspended spherical mode.

3. The uniform distribution denitrification system of claim 1, wherein, The highest position of the distribution area of the secondary water inlet distribution holes is not higher than the lowest position of the distribution area of the primary water inlet distribution holes.

4. The uniform distribution denitrification system of claim 1, wherein, The raw water inlet assembly includes a water inlet channel and a plurality of water distribution pipes, a plurality of water distribution pipes are connected with the water inlet channel, and water inlet overflow weirs corresponding to the positions of the anoxic cylinders are arranged on the water distribution pipes.

5. A process for uniform distribution denitrification, characterized by, The application relates to a uniform distribution denitrification system, and the application relates to a method for using the uniform distribution denitrification system.

6. The process as claimed in claim 5, wherein, The liquid flow in the aeration tank is subjected to gas-water separation before entering the anoxic cylinders, so that the oxygen content is reduced to below 0.5 mg / L.

7. The process as claimed in claim 5, wherein, The liquid flow in the aeration tank is subjected to gas-water separation by cyclone before entering the anoxic cylinders.

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