A tee piece water-jacketed pipe and fluidized bed reactor

Abstract

The present application relates to sewage purification treatment technical field, disclose a kind of tee water pipe and fluidized bed reactor, including main suction pipe and two auxiliary suction pipes connected to main suction pipe, one end of main suction pipe and one end of two auxiliary suction pipes are interconnected, main suction pipe and two auxiliary suction pipes form tee pipe structure in the same plane, and the end of auxiliary suction pipe away from main suction pipe is sealed;Main suction pipe is provided with several main suction holes, auxiliary suction pipe is provided with several auxiliary suction holes, and the end of main suction pipe away from auxiliary suction pipe is connected with reflux driving device.The present application is provided with tee pipe structure suction structure, so that the liquid circulation reflux effect in tank body containing electron donor is better, solve the problem of poor fluidization effect of fluidized bed reactor in prior art.

Description

Technical Field

[0001] This invention relates to the field of wastewater purification and treatment technology, specifically to a three-way water pipe and a fluidized bed reactor. Background Technology

[0002] Sulfate-autotrophic microorganisms thrive in anaerobic or hypoxic environments by utilizing inorganic carbon (CO3). 2- HCO3 - Using nitrite (NO2) as the carbon source and reducing sulfur compounds as electron donors, the carbon source is reduced. - -N) or nitrates (NO3) - The process of reducing nitrate (N-) to N2 is called sulfur autotrophic denitrification. Sulfur autotrophic denitrification technology has been widely applied in the treatment of urban sewage, industrial wastewater, nitrate-contaminated surface and groundwater, and drinking water. A fluidized bed reactor is a device used in sulfur autotrophic denitrification wastewater treatment. The fluidized bed reactor includes a tank with an inlet at the bottom. Inside the tank, from bottom to top, are interconnected fluidized and clear water zones. The tank is filled with packing material (usually sulfur powder, serving as an electron donor for the sulfur autotrophic denitrification reaction). The packing material is located in the fluidized zone. The inlet is connected to the tank's inlet pipe, and the top of the fluidized zone has a fluidized outlet. The fluidized outlet is connected to the inlet via a return pipe, which is also connected to a circulation pump.

[0003] During use, it contains nitrite (NO2) - -N) or nitrates (NO3) - Wastewater (N) enters the inlet tank through the inlet pipe. The wastewater flows out of the inlet and continuously rises, where it undergoes sulfur autotrophic denitrification with the electron donor in the fluidization zone. The purified water is located in the clear water zone at the top of the tank and is eventually discharged through the drain pipe at the top of the tank. Simultaneously, the circulation pump draws water from the top of the fluidization zone into the return pipe. The liquid in the return pipe flows back into the inlet tank and then back into the tank, thus achieving water circulation. The circulating water, combined with the existing wastewater, enters the tank and creates an upward flow impact, resulting in better mixing and reaction between the electron donor and wastewater, reducing the settling of the electron donor, and improving the fluidization effect.

[0004] Although existing technologies have improved fluidization to some extent by setting up reflux pipes, in practical applications, the reflux inlet end of the reflux pipe is only connected to the side wall of the tank. During the reflux process, only the liquid near the reflux inlet end can enter the reflux pipe. Its reflux effect on the electron donor at the top of the fluidization zone is generally poor, resulting in poor fluidization effect of the entire fluidized bed reactor. Summary of the Invention

[0005] The present invention aims to provide a three-way water pipe and a fluidized bed reactor to solve the problem of poor fluidization effect in existing fluidized bed reactors.

[0006] To solve the above problems, the present invention adopts the following technical solution: a three-way water pipe, including a main suction pipe and two auxiliary suction pipes connected to the main suction pipe, one end of the main suction pipe and one end of the two auxiliary suction pipes are connected to each other, the main suction pipe and the two auxiliary suction pipes form a three-way pipe structure located in the same plane, and the end of the auxiliary suction pipe away from the main suction pipe is sealed; the main suction pipe is provided with a plurality of main suction holes, the auxiliary suction pipes are provided with a plurality of auxiliary suction holes, and the end of the main suction pipe away from the auxiliary suction pipe is connected to a return flow drive device.

[0007] The principle of this solution is as follows: The main suction pipe and two auxiliary suction pipes in this application form a three-way pipe structure. During use, the main suction pipe and the two auxiliary suction pipes are located in the same plane. The reflux drive device connected to the main suction pipe generates a suction effect, creating a negative pressure in the main suction pipe and the two auxiliary suction pipes to draw in liquid. Since the end of the auxiliary suction pipe away from the main suction pipe is sealed, during the suction process, liquid outside the main suction pipe and auxiliary suction pipes can only be drawn into the auxiliary suction pipe and the main suction pipe through the auxiliary suction hole and the main suction hole. All the drawn liquid can be returned through the reflux drive device. In practical applications, it is only necessary to set the three-way water pipe in this application at the top of the fluidization zone in the existing technology tank, and then connect the reflux drive device to the bottom of the existing technology tank. This allows the liquid containing the electron donor at the top of the fluidization zone to reflux through the bottom of the tank, enabling the sewage and the electron donor to undergo better sulfur autotrophic denitrification in the fluidization zone, thereby improving the fluidization quality.

[0008] The beneficial effects of this solution are as follows: In this application, since a main suction pipe and two auxiliary suction pipes are provided, the main suction pipe and the auxiliary suction pipes are located in the same plane and form a three-way pipe structure. During use, the multiple main suction holes on the main suction pipe can draw liquid containing electron donors from the tank, and at the same time, the multiple auxiliary suction holes on the auxiliary suction pipes can also draw liquid containing electron donors. Compared with the prior art, which only sets a return port on the side wall of the tank to draw liquid, this application has more suction ports to draw liquid and a wider suction range, thereby making the content of electron donors in the drawn liquid more uniform, which is conducive to improving the effect of circulation and return, and making the fluidization effect better.

[0009] More importantly, the main suction pipe and auxiliary suction pipe in this application are located in the same plane. During use, simply place the three-way water pipe at the top of the fluidization zone inside the tank. The three-way water pipe can then draw in some of the liquid at the top of the fluidization zone to form a backflow. This not only allows all the liquid at the top of the fluidization zone to flow back more evenly, improving the fluidization effect, but also creates a uniform suction effect on the plane containing the main suction pipe and the two auxiliary suction pipes during the suction process. This ensures that the liquid at the top of the fluidization zone can flow back evenly and effectively. The backflowing liquid can then flow back to the bottom of the tank via the backflow drive device. The liquid flowing back to the bottom of the tank has a flushing effect, reducing dead zones and blind spots in the flow within the tank. At the same time, the liquid flowing back to the tank disturbs the liquid in the fluidization zone, enhancing the fluidization effect and improving the sufficiency of the contact reaction between sulfur autotrophic microorganisms and electron donors. Ultimately, this effectively accelerates the reaction rate and improves the efficiency of wastewater treatment, while reducing the loss of electron donors and saving costs.

[0010] Furthermore, by setting up a main suction pipe and a secondary suction pipe, and setting multiple main suction holes on the main suction pipe and multiple secondary suction holes on the secondary suction pipe, the number of inlets for the suction liquid is increased and can be more evenly distributed in the tank. This not only makes the content of electron donors in the suction liquid more uniform, but also, compared with the prior art which only opens a reflux port on the side wall of the tank, it can effectively reduce the risk of reflux blockage while ensuring the reflux effect, and further promote the fullness of the overall fluidization effect.

[0011] Preferably, as an improvement, the reflux drive device includes a reflux pipe and a reflux pump connected to the reflux pipe, with one end of the reflux pipe connected to the end of the main suction pipe.

[0012] In this scheme, a reflux pump is used to provide suction power for the main suction pipe and the auxiliary suction pipe, so that the liquid can be stably suctioned and refluxed.

[0013] Preferably, as an improvement, the main suction port is located on both sides of the main suction tube, and the secondary suction port is located on both sides of the secondary suction tube.

[0014] In this design, the main suction port is located on both sides of the main suction pipe, and the auxiliary suction port is located on both sides of the auxiliary suction pipe. This ensures that when liquid outside the main and auxiliary suction pipes enters them, it flows horizontally into the main and auxiliary suction pipes. In practical applications, the plane containing the main and auxiliary suction pipes is positioned at the top of the fluidization zone within the tank, as in existing technologies. Since the liquid flows upwards within the tank, when the liquid reaches the top of the fluidization zone, the main suction port... The direction of liquid suction from the main and auxiliary suction pipes is perpendicular to the direction of liquid flow in the tank. Due to the change in liquid flow direction, it will obstruct and interfere with the overall upward flow of the liquid in the tank. Therefore, the suction effect formed on both sides of the main and auxiliary suction pipes can have a certain obstruction effect on the upward flow of liquid in the tank. This is conducive to slowing down the liquid flow speed in the tank, especially in the fluidized zone, and forming local liquid backflow. The sulfur autotrophic microorganisms and electron donors in the fluidized zone have more sufficient contact, making the sulfur autotrophic denitrification reaction in the fluidized zone more efficient.

[0015] Furthermore, in current wastewater treatment processes, to prevent electron donors from rising into the clear water zone at the top of the tank and being discharged with the clean water, the conventional approach is to increase the tank's height, thus increasing the vertical length of the clear water zone. When the electron donors rise into the clear water zone, they automatically sink. While this method reduces the likelihood of electron donors being discharged with the clean water, the increased tank height not only raises equipment costs but also increases pressure at the bottom of the tank, increasing the risk of equipment damage and creating turbulence within the tank. To address this, the inventors made a further improvement by installing a baffle inside the tank to block the upward flow of electron donors. This baffle has filter holes that allow only clean water to pass through. While the filter holes effectively prevent electrons from rising into the clear water zone, after a period of use, the electron donors can clog the filter holes, affecting wastewater treatment. Additionally, disassembling the baffle is relatively cumbersome.

[0016] Finally, by setting up a main suction pipe and a secondary suction pipe in this solution, and placing the suction holes on the side walls of the corresponding suction pipes, the inventors can drive the electron donor at the top of the fluidization zone to circulate back. During the suction backflow process using the main suction pipe and the secondary suction pipe, the obstruction effect of the upward flow of liquid in the tank by the suction holes on both sides of the main suction pipe and the secondary suction pipe is equivalent to forming a "separation zone" in the plane area where the main suction pipe and the secondary suction pipe are located. This makes the turbulence effect in the fluidization zone more obvious, while reducing the impact of the turbulent fluid in the fluidization zone on the top clear water zone. This is conducive to the sinking of the electron donor in the clear water zone, thereby effectively reducing the situation where the electron donor is discharged upward with the clear water.

[0017] Therefore, in this solution, while ensuring the sewage treatment effect, not only is the tank height not increased, but it can also be reduced to a certain extent, saving space and reducing costs. Compared with the baffle design, the structure is simpler, less prone to clogging during use, and more stable in operation. Simultaneously, the structure, with the main suction holes located on both sides of the main suction pipe and the auxiliary suction holes on both sides of the auxiliary suction pipe, effectively improves the electron donor return effect and enhances sewage treatment efficiency. Preferably, as an improvement, the number of auxiliary suction holes on the auxiliary suction pipe is M, and the number of main suction holes on the main suction pipe is N, where M ≥ 16, N ≥ 12, and N < M.

[0018] In this design, the number of auxiliary suction holes on the auxiliary suction pipe is greater than or equal to 16, resulting in a maximum of 8 auxiliary suction holes on one side of the auxiliary suction pipe. Simultaneously, the number of main suction holes on the main suction pipe is greater than or equal to 12, resulting in a maximum of 6 main suction holes on one side of the main suction pipe. This ensures the ability of both the main and auxiliary suction pipes to suction liquid from the top of the fluidized zone, preventing insufficient suction from uniformly covering the top area of ​​the fluidized zone. Furthermore, since N is less than M in this design, the number of main suction holes on the main suction pipe is reduced. Therefore, even when the auxiliary suction pipe is located far from the reflux drive device, the negative pressure inside the auxiliary suction pipe is better than that inside the main suction pipe. The increased number of auxiliary suction holes on the auxiliary suction pipe also effectively ensures that the amount of liquid suctioned by the auxiliary and main suction pipes remains relatively small or equal, guaranteeing uniformity during the suction process. This results in a more uniform electron donor content in the reflux liquid at different locations within the tank, improving the reflux effect.

[0019] Preferably, as an improvement, the main suction holes on both sides of the main suction pipe are staggered along the axial direction of the main suction pipe, and the secondary suction holes on both sides of the secondary suction pipe are staggered along the axial direction of the secondary suction pipe.

[0020] In this design, the main suction holes are offset along the axis of the main suction pipe, and the secondary suction holes are offset along the axis of the secondary suction pipe. This avoids the main suction holes on both sides of the main suction pipe being directly opposite each other, and also avoids the secondary suction holes on both sides of the secondary suction pipe being directly opposite each other. This further enhances the liquid suction capacity of the main and secondary suction pipes and reduces mutual interference between adjacent main and secondary suction holes, allowing the liquid suction to proceed more smoothly and stably.

[0021] Preferably, as an improvement, the main suction tube is in the shape of a straight tube or a corrugated tube, and the auxiliary suction tube is in the shape of a straight tube or a corrugated tube.

[0022] In this scheme, the main and auxiliary suction pipes can be designed as straight pipes, which are simple in structure and easy to manufacture, achieving suction and reflux effects at a lower cost. Alternatively, one or both of the main and auxiliary suction pipes can be designed as corrugated pipes. Although corrugated pipes are more expensive and more difficult to manufacture, they offer better performance in practical applications. Firstly, during actual suction, the liquid entering the main and auxiliary suction pipes flows in a corrugated path. Compared to straight flow, the liquid flows more slowly in a corrugated pattern, resulting in a more stable suction process at the top of the fluidization zone. The flow pattern formed by the pumped water returning to the tank is also more stable, leading to a more efficient fluidization effect in the fluidization zone and a more stable and complete sulfur autotrophic denitrification reaction. Secondly, designing the main and auxiliary suction pipes as corrugated structures... Compared to straight pipes over the same distance, wavy pipes are longer, allowing for the convenient installation of more main and auxiliary suction holes on both the wavy main and auxiliary suction pipes. This increased number of suction holes enables more uniform liquid recirculation from the top of the fluidization zone, further improving the uniformity of electron donors in the reflux liquid. Furthermore, by designing the main and auxiliary suction pipes as wavy structures, the angles between adjacent main and auxiliary suction holes differ, allowing the liquid at the top of the fluidization zone to enter the circulation loop more evenly, resulting in better electron donor circulation. Moreover, the wavy design of the main and auxiliary suction pipes enhances the "flow resistance" effect on the upward flow of liquid within the tank during suction, leading to more efficient fluidization and reaction in the fluidization zone.

[0023] A fluidized bed reactor includes a tank and an inlet pipe connected to the bottom of the tank. The tank is provided with a fluidization zone and a clear water zone. A three-way water pipe is connected to the tank and is located at the top of the fluidization zone. The return pipe is connected between the main suction pipe and the inlet pipe.

[0024] In this scheme, a three-way water pipe is installed on the fluidized bed reactor, and the three-way water pipe is located at the top of the fluidization zone. The return pipe is connected between the main suction pipe and the inlet pipe. Under the driving action of the return drive device, the liquid at the top of the fluidization zone of the tank can return to the inlet pipe at the bottom of the tank through the auxiliary suction pipe and the main suction pipe, so that the electron donor circulates. In addition, multiple main suction pipes and auxiliary suction pipes are set at the top of the fluidization zone, which can make the electron donor return evenly during the return process, effectively improving the efficiency of the fluidization effect.

[0025] Furthermore, the reflux drive device draws liquid from the top of the fluidization zone into the reflux pipe, which then flows back into the tank along the bottom. When the refluxed liquid enters the tank simultaneously with the wastewater from the inlet pipe, compared to when only wastewater enters the tank, this design results in a larger volume of liquid flowing upwards along the bottom of the tank. This creates a greater upward impact force on the liquid in the fluidization zone, promoting upward flow and thorough mixing of the wastewater and packing material. This also allows for more complete contact and reaction between the sulfur-autotrophic microorganisms and the electron donor, improving the fluidization effect. Simultaneously, the reflux pipe draws water from the top of the fluidization zone. As the liquid from the top of the fluidization zone flows back into the reflux pipe, the top of the fluidization zone exerts an upward suction force on the entire fluidization zone, further promoting upward flow of the liquid. This allows for better mixing and reaction between the electron donor and the wastewater, reducing electron donor settling and further enhancing the fluidization effect.

[0026] Preferably, as an improvement, the side wall of the tank has a reflux port, and the main suction pipe is fixedly connected to the reflux port.

[0027] In this solution, by opening a return port on the side wall of the tank, the main suction pipe is fixedly connected to the return port, which facilitates the extension of the end of the main suction pipe to the outside of the tank and to connect with the return pipeline. At the same time, the return port structure allows the entire three-way water pipe to be easily and stably installed and fixed inside the tank.

[0028] Preferably, as an improvement, there are multiple three-way water pipes, which are arranged along the axial direction of the tank. All three-way water pipes share the same return drive device, and a switch valve is provided between the main suction pipe and the return pipe in each three-way water pipe.

[0029] In practical use, as the sulfur autotrophic denitrification reaction proceeds, the height of the top of the fluidized zone may change. Simultaneously, as the reaction progresses, the electron donor content varies in the liquid at different heights within the fluidized zone. In this design, multiple T-junction water pipes are arranged along the vertical axis of the tank. Switch valves control the opening and closing of different T-junction water pipes. The appropriate height of the T-junction water pipe can be selected for opening based on changes in the fluidized zone height or the electron donor concentration, thereby maintaining a suitable amount of electron donor reflux to ensure the sulfur autotrophic denitrification reaction proceeds efficiently. Alternatively, all the switch valves on the T-junction water pipes can be opened simultaneously, allowing all T-junction water pipes to function as reflux pipes, thus enabling reflux of liquid at different locations within the fluidized zone to meet varying reflux requirements and achieve better sulfur autotrophic denitrification.

[0030] Preferably, as an improvement, the bottom of the tank is connected to a water inlet, the number of which is at least two, all of which are simultaneously connected to the water inlet pipe and the outlet of all of which are along the tangent direction of the same circumference inside the tank, and the return pipe is connected to the water inlet pipe and a one-way valve is connected to the return pipe.

[0031] In this scheme, multiple inlets are connected to the bottom of the tank. All inlets are simultaneously connected to the inlet pipe, and the return pipe is also connected to the inlet pipe. The liquid returning in the return pipe first mixes with the wastewater in the inlet pipe, allowing the wastewater to mix with the liquid containing the electron donor before entering the bottom of the tank through the inlets. This facilitates a more thorough mixing of the wastewater and the electron donor, effectively enhancing the sulfur autotrophic denitrification reaction within the tank. Furthermore, the outlets of all inlets in this scheme are tangential to the same circumference within the tank. Therefore, when the wastewater mixes with the liquid in the return pipe and enters the bottom of the tank, it enters along the same tangential direction, allowing the mixed liquid to spiral upwards along the tank. This enhances the uniformity of mixing between the mixed liquid and the electron donor in the fluidization zone, further improving the sulfur autotrophic denitrification reaction. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of Embodiment 1 of the present invention.

[0033] Figure 2 This is a schematic diagram of the connection between the main suction tube and the auxiliary suction tube in Embodiment 1 of the present invention.

[0034] Figure 3 This is a top sectional view of the connection between the main suction pipe, the auxiliary suction pipe, and the tank in Embodiment 1 of the present invention.

[0035] Figure 4 This is a top-view sectional view of the connection between the main suction pipe, the auxiliary suction pipe, and the tank in Embodiment 2 of the present invention.

[0036] Figure 5 This is a schematic diagram of Embodiment 3 of the present invention.

[0037] Figure 6 This is a schematic diagram of Embodiment 4 of the present invention. Detailed Implementation

[0038] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: main suction pipe 1, main suction hole 101, auxiliary suction pipe 2, auxiliary suction hole 201, return pipe 3, return pump 4, tank 5, fluidization zone 501, clear water zone 502, water inlet pipe 6, electronic power supply 7, connecting pipe 8, switch valve 9, and water inlet device 10.

[0039] Example 1 This embodiment is as shown in the attached figure. Figure 1 and Figure 2 As shown: A three-way water pipe includes a main suction pipe 1 and two auxiliary suction pipes 2 connected to the main suction pipe 1. Both the main suction pipe 1 and the auxiliary suction pipes 2 are straight pipes. One end of the main suction pipe 1 is connected to one end of the two auxiliary suction pipes 2, so that the main suction pipe 1 and the two auxiliary suction pipes 2 form a three-way pipe structure located in the same plane. The two auxiliary suction pipes 2 are of equal length. The outer diameter and inner diameter of the main suction pipe 1 and the auxiliary suction pipes 2 are equal. The length of the main suction pipe 1 is greater than the length of the auxiliary suction pipe 2. The ends of the two auxiliary suction pipes 2 that are away from the main suction pipe 1 are sealed.

[0040] like Figure 2 As shown, the main suction pipe 1 has N main suction holes 101, and the auxiliary suction pipe 2 has M auxiliary suction holes 201. The diameters of the main suction holes 101 and the auxiliary suction holes 201 are equal, M ≥ 16, N ≥ 12, and N is less than M, such that the number of auxiliary suction holes 201 on each auxiliary suction pipe 2 is greater than the number of main suction holes 101 on the main suction pipe 1. In this embodiment, M is preferably 20, N is preferably 14, and the main suction... Suction holes 101 are evenly distributed on both sides of the main suction pipe 1, and auxiliary suction holes 201 are evenly distributed on both sides of the corresponding auxiliary suction pipe 2, so that both the main suction pipe 1 and the auxiliary suction pipe 2 can draw liquid in the horizontal direction; the main suction holes 101 on both sides of the main suction pipe 1 are staggered along the axial direction of the main suction pipe 1, and the auxiliary suction holes 201 on both sides of the auxiliary suction pipe 2 are staggered along the axial direction of the auxiliary suction pipe 2.

[0041] Combination Figure 1 and Figure 2 The end of the main suction pipe 1 furthest from the auxiliary suction pipe 2 is connected to a reflux drive device. The reflux drive device includes a reflux pipe 3 and a reflux pump 4 connected to the reflux pipe 3. Utilizing the suction effect of the reflux pump 4 and the negative pressure connection effect of the reflux pipe 3, a negative pressure can be created in both the main suction pipe 1 and the auxiliary suction pipe 2, thereby allowing the main suction pipe 1 and the auxiliary suction pipe 2 to draw liquid from the outside. The drawn liquid can be drawn into the reflux pipe. During the suction process, although the auxiliary suction pipe 2 is far from the auxiliary suction pipe 2... The return pipe has a longer suction flow distance, and its suction effect is worse than that of the main suction pipe 1. However, in this embodiment, M is 20 and N is 14. The auxiliary suction pipe 2 has more auxiliary suction holes 201. The more auxiliary suction holes 201 enhance the suction effect of the auxiliary suction pipe 2. Under the overall circumstances, the difference in suction effect between the main suction pipe 1 and the auxiliary suction pipe 2 is small, ensuring the uniformity of suction at different locations in the space where the main suction pipe 1 and the auxiliary suction pipe 2 are located.

[0042] A fluidized bed reactor, combined with Figure 1 and Figure 3The system includes a vertically arranged tank 5, with an inlet pipe 6 connected to the bottom of the tank 5. Inside the tank 5, from bottom to top, are a fluidization zone 501 and a clear water zone 502. The fluidization zone 501 contains packing material, which is an electron donor 7 (e.g., sulfur powder). In the prior art, wastewater enters the tank 5 through the inlet pipe 6. Combined with... Figure 1 and Figure 3 The tank body 5 is connected to a three-way water pipe as described above. The three-way water pipe is located at the top of the fluidization zone 501. A return port is opened on the side wall of the tank body 5. The end of the main suction pipe 1 away from the auxiliary suction pipe 2 extends through the return port to the outside of the tank body 5. The return pipe 3 is connected between the water inlet pipe 6 and the main suction pipe 1.

[0043] The specific implementation process is as follows: In this embodiment, in the prior art, sewage enters the bottom of tank 5 through inlet pipe 6. The sewage entering the bottom of tank 5 automatically flows upward under the action of the continuous inflow of sewage. When the sewage flows through fluidization zone 501, it undergoes sulfur autotrophic denitrification reaction and is purified. The purified water flows upward into clear water zone 502. When the liquid in tank 5 flows upward, some of the electron donors in fluidization zone 501 also move upward to the top position of fluidization zone 501 along with the upward flow of liquid. At this time, reflux pump 4 is started. The liquid containing sulfur powder electron donor 7 is drawn into main suction pipe 1 and auxiliary suction pipe 2 when passing through main suction pipe 1 and auxiliary suction pipe 2. Then it flows into reflux pipe 3 through main suction pipe 1 and enters inlet pipe 6 under the pumping action of reflux pump 4, so that the liquid containing electron donor 7 mixes with the sewage in inlet pipe 6 and enters the bottom of tank 5.

[0044] In this embodiment, the presence of a main suction pipe 1 and a secondary suction pipe 2 allows some of the liquid in the tank 5 to be drawn back to the bottom of the tank 5, forming an external circulation system that promotes the circulation of the electron donor 7 within the tank 5, thus improving the fluidization effect. Furthermore, the arrangement of the main suction pipe 1 and the secondary suction pipe 2 ensures that the liquid collected at the top of the fluidization zone 501 by the sulfur powder electron donor 7 can flow back evenly and stably. The returned liquid, along with the wastewater, enters the bottom of the tank 5 through the inlet pipe 6 and impacts the liquid in the fluidization zone 501 upwards, enhancing the turbulence within the fluidization zone 501. This improves the efficiency and sufficiency of contact between the sulfur autotrophic microorganisms and the sulfur powder electron donor 7, thereby increasing the efficiency of the sulfur autotrophic denitrification reaction within the tank 5 and ultimately improving the efficiency of wastewater treatment.

[0045] Example 2 The difference between Example 2 and Example 1 is that in Example 1, both the main suction tube 1 and the auxiliary suction tube 2 are straight tubes, while in this example, ... Figure 4As shown, both the main suction tube 1 and the auxiliary suction tube 2 are corrugated. While manufacturing the corrugated main suction tube 1 and auxiliary suction tube 2 is more difficult and costly than a straight tube structure (for example, requiring seamless welding using materials like stainless steel), the corrugated shape allows for a longer length than a straight tube. This enables the placement of more main suction holes 101 and auxiliary suction holes 201 within the same horizontal length, thus improving suction efficiency. During the suction process, more liquid in the fluidized zone 501 can be drawn back, which helps to improve the uniformity of the electron donor 7 content in the reflux liquid and the reflux efficiency. In addition, since both the main suction pipe 1 and the auxiliary suction pipe 2 are corrugated, when the main suction hole 101 and the auxiliary suction hole 201 are set, there is an angle between adjacent main suction holes 101 and adjacent auxiliary suction holes 201, so that the holes face different directions. Therefore, when drawing liquid from the top of the fluidized zone 501, liquid can be drawn from different directions, which improves the uniformity of the drawn liquid.

[0046] Example 3 The difference between Example 3 and Example 1 is as follows: Figure 5 As shown, in this embodiment, there are multiple T-junction water pipes, which are arranged vertically along the axis of the tank 5. All T-junction water pipes share the same return flow drive device, that is, only one return pipe 3 and return pump 4 are provided. Figure 4 The diagram shows three sets of three-way water pipes, with a connecting pipe 8 connecting the main suction pipe 1 and the return pipe 3 in each three-way water pipe, and a switch valve 9 installed on the connecting pipe 8.

[0047] In this embodiment, multiple sets of three-way water pipes are vertically arranged inside the tank 5. On the one hand, one set of three-way water pipes can be connected to the return pipe 3 by the switch valve 9, so that the liquid at a certain height in the fluidization zone 501 can be returned. The appropriate height of liquid return can be selected according to actual needs. On the other hand, all three-way water pipes can be opened at the same time to control the content of electron donor 7 in the return liquid, balance the contact reaction between electron donor 7 and sewage and the circulation of electron donor 7, so as to achieve a better sulfur autotrophic denitrification reaction.

[0048] Example 4 The difference between Example 4 and Example 1 is as follows: Figure 6As shown, in this embodiment, a water inlet 10 is connected to the bottom of the tank 5. There are at least two water inlets 10. All water inlets 10 are connected to the water inlet pipe 6 at the same time, so that the liquid entering the water inlet pipe 6 can enter the bottom of the tank 5 at the same time through multiple water inlets 10. In this embodiment, the outlet of all water inlets 10 is set along the tangent direction of the inner circumference of the same horizontal plane inside the tank 5, so that the liquid discharged into the bottom of the tank 5 from the outlet of all water inlets 10 can flow upward spirally along the bottom of the tank 5, improving the contact between the liquid and the electron donor 7 in the fluidization zone 501, thereby improving the fluidization effect.

[0049] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A sulfur autotrophic denitrification fluidized bed reactor, comprising a tank and an inlet pipe connected to the bottom of the tank, wherein the tank is provided with a fluidization zone and a clear water zone, and the fluidization zone contains sulfur powder, characterized in that: The tank body is connected to a three-way water pipe, which includes a main suction pipe and two auxiliary suction pipes connected to the main suction pipe. One end of the main suction pipe is interconnected with one end of each of the two auxiliary suction pipes. The main suction pipe and the two auxiliary suction pipes form a three-way pipe structure located in the same plane. The three-way pipe structure is located at the top of the fluidization zone inside the tank, and the ends of the auxiliary suction pipes away from the main suction pipe are sealed. The main suction pipe has several main suction holes, and the auxiliary suction pipes have several auxiliary suction holes. The ends of the main suction pipes away from the auxiliary suction pipes are sealed. One end of the suction tube is connected to a reflux drive device. The main suction port is located on both sides of the main suction tube, and the auxiliary suction port is located on both sides of the auxiliary suction tube. Liquid outside the main suction tube and the auxiliary suction tube is drawn into the auxiliary suction tube and the main suction tube, so that the liquid enters the main suction tube and the auxiliary suction tube in a horizontal direction. The reflux drive device includes a reflux pipe and a reflux pump connected to the reflux pipe. The reflux pipe is connected between the main suction tube and the water inlet pipe. Both the main suction tube and the auxiliary suction tube are corrugated.

2. The sulfur autotrophic denitrification fluidized bed reactor according to claim 1, characterized in that: The number of auxiliary suction holes on the auxiliary suction tube is M, and the number of main suction holes on the main suction tube is N, wherein M≥16, N≥12, and N<M.

3. The sulfur autotrophic denitrification fluidized bed reactor according to claim 1, characterized in that: The main suction holes on both sides of the main suction pipe are staggered along the axis of the main suction pipe, and the auxiliary suction holes on both sides of the auxiliary suction pipe are staggered along the axis of the auxiliary suction pipe.

4. The sulfur autotrophic denitrification fluidized bed reactor according to claim 1, characterized in that: The tank has a reflux port on its side wall, and the main suction pipe is fixedly connected to the reflux port.

5. The sulfur autotrophic denitrification fluidized bed reactor according to claim 4, characterized in that: The number of the three-way water pipes is multiple, and the multiple three-way water pipes are arranged along the axial direction of the tank. All the three-way water pipes share the same return drive device, and a switch valve is provided between the main suction pipe and the return pipe in each three-way water pipe.

6. The sulfur autotrophic denitrification fluidized bed reactor according to claim 4, characterized in that: The bottom of the tank is connected to a water inlet, and there are at least two water inlets. All water inlets are simultaneously connected to the water inlet pipe, and the outlets of all water inlets are arranged along the tangent direction of the same circumference inside the tank. The return pipe is connected to the water inlet pipe, and a one-way valve is connected to the return pipe.

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