A denitrification reaction system for treating industrial wastewater

Abstract

This utility model relates to the field of wastewater treatment, specifically a denitrification reaction system for treating industrial wastewater. It solves the problems of unidirectional water flow and uneven mixing in existing technologies. The system includes a first reaction tank and a second reaction tank. The second reaction tank is located to the lower right of the first reaction tank. Both the first and second reaction tanks have water storage areas in their upper left sections. A siphon generator is installed on each water storage area, and its output end is connected to a main water distribution pipe. A branch water distribution pipe is rotatably connected to the lower end of the main water distribution pipe, and a nozzle is connected to the side of the branch water distribution pipe. A stirring assembly is installed at the bottom of both the first and second reaction tanks. When the branch water distribution pipe rotates, it engages with the stirring assembly. The beneficial effect is that the direction of the water flow from the nozzles is opposite to the direction of the water flow driven by the stirring assembly. This multi-directional counterflow creates a turbulent flow field within the reaction tank, effectively counteracting the single horizontal flow defect of traditional water distribution systems and improving the uniformity of sludge-wastewater mixing.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment, and in particular to a denitrification reaction system for treating industrial wastewater. Background Technology

[0002] In the field of high ammonia nitrogen industrial wastewater treatment, the short-cut nitrification-anaerobic ammonia oxidation process is widely used for treating high ammonia nitrogen wastewater such as landfill leachate, coking wastewater, and pharmaceutical wastewater due to its outstanding advantages, including no need for external organic carbon sources, low sludge production, and significantly lower energy consumption than traditional nitrification-denitrification processes. The core of this process lies in a highly efficient and stable bioreactor, and achieving good hydraulic conditions and efficient sludge-wastewater mixing and mass transfer within the reactor is one of the key factors ensuring the activity of functional microorganisms and the reactor's treatment efficiency.

[0003] For example, Chinese invention patent CN116040802A discloses an integrated reactor system for treating high-ammonia-nitrogen industrial wastewater. This system cleverly utilizes the height difference between the short-cut nitrification reactor and the anaerobic ammonia oxidation reactor to achieve gravity flow of wastewater, thus reducing energy consumption. In terms of water distribution, the system employs a siphon generator coupled with a high-resistance water distribution system. This system includes a main water distribution pipe and branch pipes extending to both sides in a staggered arrangement. The staggered layout of the branch pipes aims to achieve relatively uniform water distribution at the bottom of the reactor and utilizes the water flow impact to provide a certain stirring effect.

[0004] However, the water distribution system in the above-mentioned prior art still has the following shortcomings:

[0005] The water distribution branch pipe has a fixed opening at the end and no angle adjustment function. The water flow direction is unidirectional, making it difficult to form effective counterflow. The turbulence intensity is insufficient, resulting in uneven mixing of sludge and sewage in the reactor and limited mass transfer efficiency.

[0006] Although the water distribution branch pipes are arranged in an interlaced manner, the overall layout is symmetrical. The water flow spreads mostly in the horizontal direction, resulting in a weak three-dimensional swirling effect. Dead zones are easily formed in the upper part of the reactor.

[0007] Without local flow disturbance devices, the water flow is prone to laminar flow during the flow guidance process, which further reduces the mass transfer efficiency. Utility Model Content

[0008] This invention proposes a denitrification reaction system for treating industrial wastewater, which solves the problems of unidirectional water flow and uneven mixing in the prior art.

[0009] The technical solution of this utility model is implemented as follows:

[0010] A denitrification reaction system for treating industrial wastewater includes a first reaction tank and a second reaction tank. The second reaction tank is located to the lower right of the first reaction tank. Both the first and second reaction tanks have water storage areas in their upper left portions. A siphon generator is installed in each water storage area, and its output end is connected to a main water distribution pipe. A branch water distribution pipe is rotatably connected to the lower end of the main water distribution pipe, and a nozzle is connected to the side of the branch water distribution pipe. A stirring assembly is installed at the bottom of both the first and second reaction tanks. When the branch water distribution pipe rotates, it cooperates with the stirring assembly. The branch water distribution pipe rotates due to the recoil force of the water jet from the nozzle, achieving dynamic water distribution and forming a three-dimensional vortex in the upper part of the reactor, ensuring uniform mixing. The synergistic effect of the stirring assembly and the water distribution system, with dynamic coupling between the stirring assembly and the end of the branch water distribution pipe, allows the branch water distribution pipe to drive the stirring assembly to rotate, thereby agitating the water in the reaction tank and further enhancing the mixing efficiency.

[0011] The water distribution branch pipe is equipped with multiple nozzles, which are arranged on the same side of the branch pipe. The recoil force generated by the nozzles spraying water can drive the water distribution branch pipe to rotate, thereby achieving dynamic water distribution.

[0012] The water distribution branch pipe is arranged at an angle downwards, with an inclination angle ranging from 10° to 80°. The inclined arrangement of the water distribution branch pipe allows water to be propelled out of the nozzle under its own gravity, ensuring the speed at which the water is sprayed from the nozzle.

[0013] The lower end of the main water distribution pipe is connected to a rotary joint, and the branch water distribution pipe is connected to the rotary joint.

[0014] At least one stirring assembly is installed in both the first and second reaction tanks, and these assemblies are arranged symmetrically around the rotation center of the water distribution branch pipe. Multiple stirring assemblies work together to agitate the water in the reaction tanks, expanding the water flow area and ensuring uniform mixing of the sludge and wastewater.

[0015] The stirring assembly includes a base, on which a vertically arranged rotating shaft is rotatably connected. A stirring blade is connected to the rotating shaft, and the stirring blade engages with the end of a water distribution branch pipe. When the water distribution branch pipe rotates, the end of the branch pipe actuates the stirring blade, causing the stirring blade to rotate around the rotating shaft, thus stirring the water in the reaction tank.

[0016] The reaction system also includes a return pipeline, one end of which is connected to the inlet pipe of the first reaction tank, and the other end of which is connected to the outlet pipe of the second reaction tank. Circulating water flows back into the inlet pipe through the return pipeline, allowing it to re-enter the first reaction tank for reuse, thus achieving the reuse of circulating water.

[0017] A return pump is installed on the return pipeline. The return pump provides power for the flow of circulating water.

[0018] An aeration disc is installed at the bottom of the first reaction tank. The aeration disc provides dissolved oxygen for the chemical reactions in the first reaction tank.

[0019] A microbial separator is installed in the upper right part of the first and second reaction tanks. When the liquid level in the first and second reaction tanks rises to the microbial separator, the mud-water mixture is separated.

[0020] The beneficial effects of this utility model are:

[0021] First, the water distribution branch pipes rotate under the recoil force of the water jets from the nozzles, achieving dynamic water distribution and making the wastewater enter the reaction tank more evenly, which is beneficial to improving mixing efficiency. Second, the rotation of the water distribution branch pipes can also cause the stirring components to rotate, which in turn stirs the water in the reaction tank, further improving mixing efficiency. Finally, the direction of the water jets from the nozzles is opposite to the direction of the water flow driven by the stirring components. The multi-directional water flow creates a turbulent flow field in the reaction tank, effectively offsetting the single horizontal flow defect of traditional water distribution systems and improving the uniformity of sludge and wastewater mixing.

[0022] When the reaction system is in use, the water distribution branch pipe can simultaneously move multiple stirring components. The multiple stirring components work together to stir the water in the reaction tank, expand the water flow area, eliminate dead zones, and ensure uniform mixing of sludge and dirt.

[0023] The siphon generator utilizes the water level difference in the storage area to achieve gravity-fed water distribution, converting the water's own gravity into the recoil force when the nozzle sprays water, eliminating the need for additional power and reducing energy consumption. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a denitrification reaction system for treating industrial wastewater according to the present invention.

[0026] Figure 2 This is a schematic diagram showing the connection between the water distribution branch pipe and the mixing assembly.

[0027] In the diagram: 1. First reaction tank; 2. Water storage area; 3. Thin branch pipe; 4. U-shaped thick branch pipe; 5. Siphon vacuum pipe; 6. Main water distribution pipe; 7. Branch water distribution pipe; 71. Sprayer; 8. Microbial separator; 9. Stirring assembly; 91. Base; 92. Rotating shaft; 93. Stirring blade; 10. Aeration disc; 11. Second reaction tank; 12. Outlet pipe; 13. Return pipe; 14. Return pump; 15. Inlet pipe. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example 1, such as Figure 1 , Figure 2 As shown, a denitrification reaction system for treating industrial wastewater includes a first reaction tank 1 and a second reaction tank 11. The second reaction tank 11 is located on the lower right side of the first reaction tank 1. The upper left parts of the first reaction tank 1 and the second reaction tank 11 are respectively provided with water storage areas 2. A siphon generating device is provided on the water storage area 2. The output end of the siphon generating device is connected to a water distribution main pipe 6. The lower end of the water distribution main pipe 6 is rotatably connected to a water distribution branch pipe 7. A nozzle 71 is connected to the side of the water distribution branch pipe 7. A stirring assembly 9 is provided at the bottom of both the first reaction tank 1 and the second reaction tank 11. When the water distribution branch pipe 7 rotates, the water distribution branch pipe 7 cooperates with the stirring assembly 9.

[0030] Specifically, a rotary joint is connected to the lower end of the main water distribution pipe 6, and the branch water distribution pipe 7 is connected to the rotary joint. The siphon generator utilizes the height difference between the water level in the storage area 2 and the water level in the reaction tank to achieve gravity-flow water distribution. During the water distribution process, the gravity of the water itself is converted into the recoil force of the nozzle 71 when spraying water, which realizes the rotation of the branch water distribution pipe 7, thereby achieving dynamic water distribution and making the wastewater enter the reaction tank more evenly. When the branch water distribution pipe 7 rotates, it can drive the stirring component 9 to rotate, so that the stirring component 7 can stir the water in the reaction tank, further improving the mixing efficiency. The direction of the water flow sprayed from the nozzle 71 is opposite to the direction of the water flow driven by the stirring component 9. The multi-directional water flow counter-current creates a turbulent flow field in the reaction tank, effectively counteracting the single horizontal flow defect of the traditional water distribution system and improving the uniformity of sludge and sewage mixing.

[0031] The working process of the reaction system is as follows: sewage enters the water storage area 2 in the first reaction tank 1 through the inlet pipe 15. The water in the water storage area 2 enters the main water distribution pipe 6 through the siphon generator, and then sprays out into the first reaction tank 1 through the water distribution branch pipe 7 and the nozzle 71. After the sewage reacts in the first reaction tank 1, it overflows and enters the water storage area 2 in the second reaction tank 11. After the sewage reacts in the second reaction tank 11, it enters the second reaction tank 11 through the siphon generator, the main water distribution pipe, the water distribution branch pipe, and the nozzle. After the reaction is completed in the second reaction tank 11, it is discharged from the outlet pipe 12.

[0032] Furthermore, the water distribution branch pipe 7 is equipped with multiple nozzles 71, which are arranged on the same side of the water distribution branch pipe 7. In this embodiment, there are two water distribution branch pipes 7, and the nozzles 71 on the two water distribution branch pipes 7 are located on the right side of the water distribution branch pipe 7. When water is distributed, the nozzles 71 spray water to the right side of the water distribution branch pipe 7, at which time the water distribution branch pipe 7 rotates counterclockwise.

[0033] Furthermore, the water distribution branch pipe 7 is arranged obliquely downwards, and the inclination angle of the water distribution branch pipe 7 ranges from 10° to 80°. In this embodiment, the inclination angle of the water distribution branch pipe 7 is 30°, so that the water can still flow downwards by its own gravity within the water distribution branch pipe 7, thereby increasing the flow velocity of the water jet from the nozzle 71 at the end of the water distribution branch pipe 7 and providing sufficient recoil force for the rotation of the water distribution branch pipe 7.

[0034] Example 2, based on Example 1, provides a denitrification reaction system for treating industrial wastewater. At least one stirring component 9 is distributed within the first reaction tank 1 and the second reaction tank 11, with each stirring component 9 arranged symmetrically around the rotation center of the water distribution branch pipe 7. In this example, each reaction tank has two stirring components 9; the two stirring components 9 work together to stir the water in the reaction tank, expanding the water flow area and ensuring uniform mixing of sludge and wastewater.

[0035] Furthermore, the stirring assembly 9 includes a base 91, on which a vertically arranged rotating shaft 92 is rotatably connected. A stirring blade 93 is connected to the rotating shaft 92, and the stirring blade 93 engages with the end of the water distribution branch pipe 7. The stirring blades 93 are arranged vertically, and four stirring blades 93 are arranged on each rotating shaft 92. The stirring blades 93 are centrally symmetrically arranged on the rotating shaft 92. When the water distribution branch pipe 7 rotates, the end of the water distribution branch pipe 7 agitates the stirring blades 93, causing the stirring blades 93 to rotate around the rotating shaft. The rotation of the stirring blades 93 stirs the water in the reaction tank.

[0036] Furthermore, the reaction system also includes a return pipe 13, one end of which is connected to the inlet pipe 15 on the first reaction tank 1, and the other end of which is connected to the outlet pipe 12 on the second reaction tank 11. A return pump 14 is installed on the return pipe 13. After the water treated in the reaction tank is discharged from the outlet pipe 12, it can flow back into the inlet pipe 12 through the return pipe 13, allowing the circulating water to re-enter the first reaction tank 1 for reuse, thus achieving the reuse of circulating water. The return pump 14 provides power for the flow of circulating water.

[0037] Furthermore, an aeration disc 10 is provided at the bottom of the first reaction tank 1. The aeration disc 10 provides dissolved oxygen for the chemical reactions in the first reaction tank 1. A microbial separator 8 is provided in the upper right part of the first reaction tank 1 and the second reaction tank 11. When the liquid level in the first reaction tank 1 and the second reaction tank 11 rises to the level of the microbial separator 8, the mud-water mixture is separated.

[0038] In addition, the process of the siphon generating device is as follows: First, the water in the water storage area 2 enters the reaction tank through the thin branch pipe 3 at a small flow rate due to its own gravity. At the same time, it drives the air in the siphon vacuum pipe 5 downward, causing the siphon vacuum pipe 5 to form a vacuum. When the liquid level in the water storage area 2 is higher than the inlet on the left side of the U-shaped thick branch pipe 4, a liquid seal is formed at the inlet of the U-shaped thick branch pipe 4, and the left half of the U-shaped thick branch pipe 4 forms a closed space. As the liquid level in the water storage area 2 and the liquid level in the U-shaped thick branch pipe 4 rise to the top of the bend of the U-shaped thick branch pipe 4, the siphon vacuum pipe 5 evacuates the U-shaped thick branch pipe 4, and a siphon effect occurs in the U-shaped thick branch pipe 4. The sewage stored in the water storage area 2 enters the water distribution main pipe 6 through the U-shaped thick branch pipe 4 at a larger flow rate, and then is sprayed out from the nozzle 71 on the water distribution branch pipe 7.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A denitrification reaction system for treating industrial wastewater, comprising a first reaction tank (1) and a second reaction tank (11), the second reaction tank (11) being arranged at the lower right side of the first reaction tank (1), and the upper left parts of the first reaction tank (1) and the second reaction tank (11) being respectively provided with a water storage area (2), characterized in that, A siphon generator is provided on the water storage area (2). The output end of the siphon generator is connected to the main water distribution pipe (6). The lower end of the main water distribution pipe (6) is rotatably connected to the branch water distribution pipe (7). The side of the branch water distribution pipe (7) is connected to the nozzle (71). The bottom of the first reaction tank (1) and the second reaction tank (11) are both equipped with stirring components (9). When the branch water distribution pipe (7) rotates, the branch water distribution pipe (7) cooperates with the stirring components (9).

2. The denitrification reaction system for treating industrial wastewater according to claim 1, wherein, Multiple nozzles (71) are provided on the water distribution branch pipe (7), and the nozzles (71) are arranged on the same side of the water distribution branch pipe (7).

3. The denitrification reaction system for treating industrial wastewater according to claim 1, wherein The water distribution branch pipe (7) is arranged at an angle downwards, and the inclination angle of the water distribution branch pipe (7) is in the range of 10°~80°.

4. The denitrification reaction system for treating industrial wastewater according to claim 1, wherein The lower end of the main water distribution pipe (6) is connected to a rotary joint, and the branch water distribution pipe (7) is connected to the rotary joint.

5. The denitrification reaction system for treating industrial wastewater according to any one of claims 1 to 4, characterized in that, At least one stirring component (9) is provided in the first reaction tank (1) and the second reaction tank (11), and each stirring component (9) is arranged in a centrally symmetrical manner around the rotation center of the water distribution branch pipe (7).

6. The denitrification reaction system for treating industrial wastewater according to claim 5, characterized in that, The stirring assembly (9) includes a base (91), on which a vertically arranged rotating shaft (92) is rotatably connected, and a stirring blade (93) is connected to the rotating shaft (92). The stirring blade (93) is engaged with the end of the water distribution branch pipe (7).

7. The denitrification reaction system for treating industrial wastewater according to claim 1 or 6, characterized in that, It also includes a return pipe (13), one end of which is connected to the inlet pipe (15) on the first reaction tank (1), and the other end of which is connected to the outlet pipe (12) on the second reaction tank (11).

8. The denitrification reaction system for treating industrial wastewater according to claim 7, characterized in that, A return pump (14) is installed on the return pipeline (13).

9. The denitrification reaction system for treating industrial wastewater according to claim 8, characterized in that, The bottom of the first reaction tank (1) is equipped with an aeration plate (10).

10. The denitrification reaction system for treating industrial wastewater according to claim 9, characterized in that, Microbial separators (8) are provided in the upper right part of the first reaction tank (1) and the second reaction tank (11).

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