Fluidized bed reactor for sewage treatment

Abstract

The present application relates to the field of sewage treatment, and particularly relates to a fluidized bed reactor for sewage treatment, which comprises a vertical tank body, a water inlet device is arranged at the bottom of the tank body, a water inlet pipe is connected to the water inlet device, a reflux pipeline is connected to the tank body, the lower end of the reflux pipeline is connected to the water inlet device, a water suction device is connected to the upper end of the reflux pipeline, the water suction device is arranged inside the tank body and divides the tank body into a clean water area above the water suction device and a fluidized area below the water suction device, a circulating pump is arranged on the reflux pipeline, a plurality of vertical water outlet devices are arranged in the fluidized area, a plurality of liquid outlet holes are arranged on the water outlet devices, and the water outlet devices are communicated with the reflux pipeline; the liquid sucked by the water suction device enters the water inlet device and the water outlet devices through the reflux pipeline. Through the present application, the problem of poor fluidization effect in the middle of the fluidized area is solved, and the fluidization effect in the middle of the fluidized area is improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment, and more specifically to a fluidized bed reactor for wastewater treatment. 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 used in the treatment of urban sewage, industrial wastewater, nitrate-contaminated surface and groundwater, and drinking water.

[0003] A fluidized bed reactor is a device used in the sulfur autotrophic denitrification wastewater treatment process. The fluidized bed reactor includes a tank, the inside of which is filled with packing material (usually sulfur powder). The tank is divided into a fluidized zone and a clear water zone, which are connected. The clear water zone is located above the fluidized zone, and the packing material is located in the fluidized zone. A water inlet is located at the bottom of the tank, and the water inlet is connected to the water inlet pipe of the tank. A fluidized bed outlet is located at the top of the fluidized zone, and the fluidized bed outlet is connected to the water inlet again through a return pipe. A circulation pump is installed on the return pipe.

[0004] Therefore, it contains nitrite (NO2) - -N) or nitrates (NO3) - Wastewater containing SO₂ (SO₄²⁻) enters the inlet pipe and flows out, continuously rising. In the fluidized zone, the wastewater and SO₂ undergo sulfur autotrophic denitrification, and the purified water is located in the clear water zone at the top of the tank. A circulation pump draws water from the top of the fluidized zone into the return pipe, from which the liquid flows back into the inlet and is ejected, thus achieving water circulation. The upward ejection of water from the inlet creates an upward impact force. Simultaneously, the return pipe draws water from the top of the fluidized zone, and the water at the top flows back into the return pipe. This combination of the impact force at the bottom of the tank and the suction force at the top of the fluidized zone ensures better mixing and reaction of SO₂ and wastewater, reducing SO₂ settling and improving the fluidization effect.

[0005] Because the bottom of the fluidizing zone is subjected to the upward force of the inlet, and the top of the fluidizing zone is subjected to the suction force of the return pipe, both the top and bottom of the fluidizing zone are subjected to force. However, the middle part of the fluidizing zone is relatively calm and gentle compared to the top and bottom, which is not conducive to the full mixing reaction of SO and water. The fluidization effect in the middle part of the fluidizing zone is poor. Summary of the Invention

[0006] The present invention aims to provide a fluidized bed reactor for wastewater treatment to solve the problem of poor fluidization effect in the middle of the fluidization zone and improve the fluidization effect in the middle of the fluidization zone.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a fluidized bed reactor for wastewater treatment, comprising a vertical tank, an inlet device at the bottom of the tank, an inlet pipe connected to the inlet device, a return pipe connected to the tank, the lower end of the return pipe connected to the inlet device, and a suction element connected to the upper end of the return pipe, the suction element being located inside the tank and dividing the tank into a clear water zone above the suction element and a fluidized zone below the suction element, a circulation pump being provided on the return pipe, and multiple vertically arranged outlets being provided in the fluidized zone, each outlet having multiple liquid outlet holes, all of which are connected to the return pipe; the liquid sucked in by the suction element enters the inlet device and each outlet through the return pipe.

[0008] The principle and advantages of the above-mentioned scheme in this application are: it contains nitrite (NO2) - -N) or nitrates (NO3) - Wastewater containing SO₂ enters the inlet device through the inlet pipe. The wastewater flows out of the inlet device and continues to flow upward. The wastewater and SO₂ undergo sulfur autotrophic denitrification in the fluidization zone. The purified water is located in the clear water zone at the top of the tank.

[0009] The circulating pump draws water from the top of the fluidized zone through the suction element into the return pipe, which then flows into the inlet and is ejected from the inlet, thus achieving water circulation. The water drawn into the return pipe and the water from the inlet pipe are both ejected upwards at an angle from the inlet. Compared to when only the water from the inlet pipe is ejected upwards, the volume of water ejected upwards from the inlet is greater, resulting in a stronger upward impact force on the liquid in the fluidized zone. This promotes upward flow of water within the fluidized zone, ensuring thorough mixing of the water and packing material, thereby improving the fluidization effect of the fluidized zone.

[0010] At the same time, the return pipe draws water from the top of the fluidized zone, and the water at the top of the fluidized zone flows into the return pipe. The top of the fluidized zone has an upward suction force on the water, which is conducive to the upward flow of water in the fluidized zone, so that SO and sewage can mix and react better, reducing the settling of SO and improving the fluidization effect.

[0011] Furthermore, since all the outlet components are connected to the return pipe, the liquid entering the return pipe from the suction component also enters the outlet components at different heights. The liquid flows out from the outlet components at different heights, and the liquid flowing out from the outlet components can impact the liquid at different heights. This causes the different heights in the middle of the fluidized zone to be impacted and no longer relatively calm, which is beneficial to the mixing and contact of water and packing in the middle of the fluidized zone. Compared with the existing technology, where only the top and bottom of the fluidized zone are subjected to greater forces while the middle of the fluidized zone is subjected to weaker forces, this technology solves the problem of poor fluidization effect in the middle of the fluidized zone and improves the fluidization effect in the middle of the fluidized zone.

[0012] In summary, the proposed solution uses an upward-spraying inlet to impact and swirl the liquid at the bottom of the fluidized zone, while the suction unit draws liquid from the top of the fluidized zone and exerts suction on it. The outlet unit impacts the liquid at different heights within the fluidized zone. As a result, different parts of the entire fluidized zone are subjected to force and are no longer calm and gentle, thus greatly improving the overall fluidization effect of the entire fluidized bed reaction zone.

[0013] Preferably, as an improvement, each outlet component and return pipe is connected to a branch assembly, each branch assembly including a branch pipe and a connecting pipe, the connecting pipe being connected between the branch pipe and the outlet component, the branch pipe being connected to the return pipe and the connection point being provided with a first valve.

[0014] Therefore, the connecting pipe serves to connect the outlet and the branch pipe. Liquid from the return pipe enters different branch pipes, then flows from the branch pipes into the connecting pipe, and finally into the outlet. The first valve controls whether the branch pipes open and close, controlling whether liquid from the return pipe enters the branch pipes, thus controlling whether water flows from the corresponding outlet. Simultaneously, by controlling the opening degree of the first valve, the liquid flow rate in the branch pipes is controlled, resulting in different liquid flow rates at different heights of the outlet. This allows for targeted adjustment of the liquid flow rate at different heights. For example, outlets closer to the inlet (or suction unit) are affected by the inlet or suction unit, so their flow rate is set relatively low. Conversely, outlets farther from the inlet (or suction unit) are less affected, so their flow rate is set relatively high, ensuring that the fluidization effect is not significantly different at different heights of the tank.

[0015] Preferably, as an improvement, each connecting pipe is connected to a sampling tube, and the sampling tube is equipped with a second valve.

[0016] In wastewater treatment, it is necessary to sample and test the liquid at different heights in the fluidization zone to check whether the fluidization effect meets the requirements. Therefore, when sampling is required at different heights in the fluidization zone, the first valve is closed to stop the liquid in the return pipe from entering the branch pipe. Simultaneously, the second valve (used to control whether liquid flows out of the sampling pipe) is opened. The liquid at the corresponding height flows back into the effluent and then through the connecting pipe into the sampling pipe, finally flowing out of the sampling pipe, thus achieving sampling of the liquid at the corresponding height.

[0017] In this design, the water outlet is located inside the tank. It not only serves to dissipate water but also collects liquid from a corresponding height within the tank during sampling. Because the water outlet extends into the tank, liquid from different horizontal locations within the tank enters it. This ensures that the liquid flowing out of the sampling tube represents liquid from different horizontal locations within the tank, allowing for sampling from various parts of the tank. This prevents the sampled liquid from concentrating in one particular area, thus improving the accuracy of the sampling and detection.

[0018] Preferably, as an improvement, each sampling tube is connected to a drain branch pipe, and the ends of multiple drain branches away from the sampling tube are connected to a main drain pipe, which is connected to the bottom of the return pipe; each drain branch pipe is equipped with a third valve.

[0019] Because the liquid in the outlet component comes directly from the liquid in the return pipe, which in turn comes directly from the suction component, direct sampling would result in the collected liquid not being the liquid outside the outlet component inside the tank, but rather the liquid that has just entered the outlet component from the return pipe. Since this liquid originates from the suction component, the sampling and detection error would be significant. To address this issue, the inventors devised the aforementioned structure. Before sampling, the first and second valves are closed, and the third valve is opened. The liquid in the connecting pipe and outlet component enters the drain branch pipe, then flows from the drain branch pipe into the drain main pipe, and finally back to the bottom of the return pipe, ultimately entering the inlet. This ensures that the liquid entering the connecting pipe and outlet component from the return pipe before sampling is discharged, preventing the collected liquid from entering the connecting pipe and outlet component from the return pipe, instead of the liquid surrounding the outlet component. After the residual liquid in the connecting pipe and the outlet is discharged, the liquid outside the outlet enters the outlet. At this time, the third valve is closed and the second valve is opened. The liquid flowing out of the sampling pipe is the liquid outside the outlet of the fluidized zone, thus ensuring the accuracy of the sampled liquid and improving the accuracy of sampling and detection.

[0020] Preferably, as an improvement, the second valve and the third valve are the same valve and are located at the connection between the sampling tube and the drain branch.

[0021] Therefore, by controlling the same valve (such as a three-way valve), the flow direction of the liquid in the connecting pipe can be controlled, and whether the liquid flows out of the sampling pipe or into the drain branch pipe can be controlled. This eliminates the need to set up two valves and control them separately, making the setup simple and the operation convenient.

[0022] Preferably, as an improvement, a sampling box is connected to the end of the sampling tube furthest from the connecting tube. Thus, the liquid flowing out of the sampling tube automatically enters the sampling box, achieving the collection of the sampled liquid.

[0023] Preferably, as an improvement, the water-absorbing component includes a water-absorbing pipe with a transverse water-absorbing port.

[0024] Therefore, the liquid in the tank enters the suction unit through the suction port. The suction port on the suction unit is set horizontally, rather than vertically downward. The horizontal setting of the suction port is inconsistent with the direction of the vertically upward flowing water, which can, to a certain extent, prevent the vertically upward flowing water from directly entering the suction port and bringing in a large amount of sulfur powder. In this way, only a small amount of sulfur powder enters the return pipe, avoiding a large amount of sulfur powder entering the return pipe and causing blockage.

[0025] Preferably, as an improvement, the water outlet component includes a main water outlet pipe and multiple branch water outlet pipes, with the branch water outlet pipes connected to the main water outlet pipe.

[0026] Thus, the liquid in the connecting pipe enters the main outlet pipe and then into multiple branch outlet pipes. The liquid flows out from different branch outlet pipes, impacting the liquid in different transverse parts of the tank, thereby improving the fluidization effect. When collecting liquid, the liquid in different transverse parts of the tank enters the main outlet pipe through different branch outlet pipes and finally flows out from the sampling pipe, ensuring the collection of liquid from different transverse parts of the tank.

[0027] Preferably, as an improvement, the circulation pump is located between the topmost first valve and the suction element. This placement allows the circulation pump to power the return pipe and all branch components, reducing the number of circulation pumps required.

[0028] Preferably, as an improvement, the outlet of the inlet is inclined at 15-20° to the horizontal plane. This angled outlet causes the water to spray out at an angle, thereby providing an upward impact force and tangential force, ensuring sufficient fluidization of the packing material in the fluidization zone, enhancing the contact and mixing of wastewater and sulfur powder, improving the cultivation efficiency of granular sludge, and making the sulfur autotrophic denitrification reaction more complete. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a fluidized bed reaction zone for wastewater treatment.

[0030] Figure 2 for Figure 1 A magnified view of A in the middle.

[0031] Figure 3 for Figure 1 Top sectional view of the central suction pipe.

[0032] Figure 4 for Figure 1 Top view of the water outlet component.

[0033] Figure 5 This is a top view of the water outlet component inside the tank in Example 4. Detailed Implementation

[0034] The following detailed description illustrates the specific implementation method:

[0035] The reference numerals in the accompanying drawings include: tank body 1, base 2, inlet pipe 3, inlet device 4, packing 5, fluidization zone 6, clear water zone 7, outlet branch pipe 8, return pipe 9, circulation pump 10, connecting pipe 11, drain branch pipe 12, sampling pipe 13, sampling box 14, drain main pipe 15, first valve 16, branch pipe 17, suction component 18, third valve 19, second valve 20, suction port 21, outlet main pipe 22, driven sprocket 23, chain 24, driving sprocket 25.

[0036] Example 1

[0037] The basics are as follows: Figures 1-4 As shown: A fluidized bed reactor for wastewater treatment includes a vertical tank 1, which is circular in plan view. A base 2 is installed at the bottom of the tank 1, which improves the stability of the tank 1. An inlet 4 is installed at the bottom of the tank 1. The inlet 4 is a vortex inlet, and its outlet (a nozzle) is inclined upwards at 15-20° to the horizontal plane. An inlet pipe 3 is connected to the inlet 4 and is located on the left side of the tank 1. In this embodiment, the outlet of the vortex inlet is inclined at 15-20°. This is because this angle provides upward impact and tangential force, ensuring sufficient fluidization of the packing material in the fluidized zone, enhancing the contact and mixing of wastewater and sulfur powder, improving the cultivation efficiency of granular sludge, and making the sulfur autotrophic denitrification reaction more complete.

[0038] A return pipe 9 is connected to the tank body 1, located on the right side of the tank body 1. The lower end of the return pipe 9 is connected to the water inlet 4, and the upper end of the return pipe 9 is connected to a suction element 18. The suction element 18 is located inside the tank body 1 and divides the interior of the tank body 1 into a clear water zone 7 above the suction element 18 and a fluidization zone 6 below the suction element 18. The fluidization zone 6 is filled with packing material 5, which is sulfur powder. In this embodiment, the suction element 18 is specifically a suction pipe, combined with... Figure 3 As shown, the side wall of the suction pipe is provided with a horizontally arranged suction port 21. There can be multiple suction pipes, which are connected to each other in a certain shape. The specific shape of the connection of multiple suction pipes is not important, and they can be connected in various ways. For example, multiple suction pipes can be arranged horizontally side by side and connected (end to end, or end to end); or the ends of multiple suction pipes can be connected to form a radial pattern, in which case the connection point of the multiple suction pipes is located at the center of the radial pattern.

[0039] A circulation pump 10 is installed on the top of the return pipe 9. The number of circulation pumps 10 can be set according to actual conditions; one is shown in this embodiment. The fluidization zone 6 has multiple vertically arranged water outlets; in this embodiment, there are four water outlets. Each water outlet has multiple liquid outlet holes, and all water outlets are connected to the return pipe 9. The liquid sucked in by the suction device 18 enters the inlet 4 and each water outlet through the return pipe 9. Specifically, in conjunction with... Figure 4 As shown, the water outlet component in this embodiment includes multiple water outlet branch pipes 8, which are interconnected. The connection method of the multiple water outlet branch pipes 8 can be parallel (the water outlet branch pipes 8 are arranged side-by-side and connected at their ends) or series (the water outlet branch pipes 8 are arranged side-by-side and connected end-to-end). Other connection methods are also possible. The shape of the water outlet component formed by connecting the multiple water outlet branch pipes 8 is not important; any shape is acceptable. In this embodiment, the shape of the water outlet component formed by connecting the multiple water outlet branch pipes 8 is as follows: Figure 4As shown, the lateral portion of the water outlet can extend as far to the left as possible to different lateral portions of the liquid. Different water outlet branch pipes 8 are located at different lateral portions in the front-to-back direction of the tank. In this embodiment, the top view of the tank 1 is circular, and the lengths of each water outlet branch pipe 8 are different, with the branch pipe 8 being longer closer to the diameter of the tank 1. To improve the stability of the water outlet branch pipe 8, in this embodiment, the left end of the water outlet branch pipe 8 is connected to the inner wall of the tank 1. The connection method can be welding or snap-fit. When snap-fitted, a groove is provided on the left inner wall of the tank 1, and the left end of the water outlet branch pipe 8 is snapped into the groove. The water outlet branch pipe 8 is provided with a liquid outlet hole, which is located on the upper surface of the water outlet branch pipe 8. Each water outlet and the return pipe 9 is connected by a branch assembly. In this embodiment, each branch assembly includes a branch pipe 17 and a connecting pipe 11. The connecting pipe 11 is connected to the water outlet, and the branch pipe 17 is connected to the connecting pipe 11. The branch pipe 17 is connected to the return pipe 9, and a first valve 16 is provided at the connection point. Since there are four water outlets in this embodiment, there are four branch components in this embodiment, and the four branch components are arranged from top to bottom.

[0040] Therefore, it contains nitrite (NO2) - -N) or nitrates (NO3) - Wastewater containing sulfur (SO) enters the inlet 4 through the inlet pipe 3. The wastewater flows out of the inlet 4 at an angle and continues to flow upward. The wastewater and SO undergo sulfur autotrophic denitrification in the fluidization zone 6. The purified water overflows into the clear water zone 7. The water in the clear water zone 7 is more stable and cleaner than the liquid in the sulfurization zone 6.

[0041] Simultaneously, the circulating pump 10 is started. Water from the top of the fluidizing zone 6 enters the suction unit 18 laterally through the horizontal suction port 21, and flows to the right through the suction unit 18 into the return pipe 9. Part of the liquid in the return pipe 9 enters the four branch components, and part flows downward to the bottom of the return pipe 9 and back into the inlet 4, from which it is sprayed out. In this way, part of the water sprayed out of the inlet 4 comes from the inlet pipe 3 and part comes from the return pipe 9. Compared to only water from the inlet pipe 3 spraying out of the inlet 4, the water volume sprayed out of the inlet 4 is greater, and the water sprayed out of the inlet 4 is more abundant. This gives the water in the fluidizing zone 6 a greater upward impact force, which is conducive to the upward flow of water in the fluidizing zone 6, so that the water and the packing 5 are fully mixed, thereby improving the fluidization effect of the fluidizing zone 6.

[0042] The water at the top of the fluidization zone 6 is drawn in by the suction device 18. The suction device 18 exerts an upward suction force on the water in the fluidization zone 6 as a whole. Thus, the suction device 18 at the top of the fluidization zone 6 draws the water upward, and the water inlet 4 at the bottom of the fluidization zone 6 sprays the water upward at an angle. This facilitates the upward flow of water in the fluidization zone 6, allowing SO and sewage to mix and react better, reducing the settling of SO, and improving the fluidization effect.

[0043] In addition, the liquid in the return pipe 9 enters the branch components to the left, and the liquid in each branch component enters the corresponding outlet. The liquid flows out from the outlet at different heights, and the liquid flowing out from the outlet can impact the liquid at different heights in the fluidization zone 6. This causes the middle of the fluidization zone 6 to be impacted at different heights and no longer calm, which is beneficial to the mixing and contact of water and packing 5. Compared with the existing technology, where only the top and bottom of the fluidization zone 6 are subjected to greater force, while the middle of the fluidization zone 6 is subjected to weaker force, this solves the problem of poor fluidization effect in the middle of the fluidization zone 6, and improves the fluidization effect in the middle of the fluidization zone 6.

[0044] Example 2

[0045] This embodiment is a further improvement on embodiment 1, combining... Figure 1 , Figure 2 As shown, in this embodiment, each connecting pipe 11 is connected to a sampling pipe 13, and the sampling pipe 13 is equipped with a second valve 20. The end of the sampling pipe 13 away from the connecting pipe 11 is connected to a sampling box 14.

[0046] Therefore, during normal fluidization, the second valve 20 is closed and the first valve 16 is open, so liquid flows out of the outlet but does not flow out of the sampling tube 13.

[0047] When it is necessary to sample the liquid at different heights in tank 1 to test the fluidization effect of the liquid at different heights in tank 1, the first valve 16 at the corresponding height is closed, and the liquid in the return pipe 9 stops entering the branch pipe 17. Then, the second valve 20 is opened, and the liquid around the outlet at the corresponding height enters the outlet through the outlet hole of the outlet, flows to the right into the connecting pipe 11, and finally flows out from the sampling pipe 13, thus realizing the sampling of the liquid at the corresponding height.

[0048] In this embodiment, the water outlet is provided with different numbers of water outlet branch pipes 8 arranged in a front-to-back pattern. The different water outlet branch pipes 8 are located at different parts of the tank body 1 in the horizontal direction. In this way, during the sampling process, the liquid from different parts of the tank body 1 at the corresponding height enters the water outlet, and the liquid flowing out from the sampling pipe 13 is the liquid from different parts of the tank body 1 in the horizontal direction. This makes the sampled liquid come from different parts of the tank body 1, realizing the sampling of liquid from different parts of the water outlet in the horizontal direction. The sampled liquid will not be concentrated from a certain part of the tank body 1, which is beneficial to improving the accuracy of sampling and detection.

[0049] Example 3

[0050] Before sampling, because the liquid in the water outlet comes directly from the liquid in the return pipe 9 during the water outlet process, and the liquid in the return pipe 9 comes directly from the water suction device 18 (the water in the water suction device 18 comes from the top of the fluidization zone 6), if sampling is performed directly, the collected liquid will not be the liquid outside the water outlet, but the liquid that has just entered the water outlet from the return pipe 9, resulting in a large sampling and detection error.

[0051] Therefore, in order to solve the above problems, this embodiment is further improved based on embodiment 2. In this embodiment, each sampling tube 13 is connected to a drain branch pipe 12, and the ends of multiple drain branch pipes 12 away from the sampling tube 13 are connected to a main drain pipe 15. The main drain pipe 15 is connected to the bottom of the return pipe 9. Each drain branch pipe 12 is equipped with a third valve 19.

[0052] Therefore, before sampling, the first valve 16 and the second valve 20 are closed, and the third valve 19 is opened. The liquid in the connecting pipe 11 and the water outlet enters the drain branch pipe 12 in sections along the connecting pipe 11 and the sampling pipe 13. The liquid then enters the drain main pipe 15 from the drain branch pipe 12 and flows back to the bottom of the return pipe 9 along the drain main pipe 15, finally entering the water inlet 4. In this way, the liquid that entered the connecting pipe 11 and the water outlet from the return pipe 9 before sampling is discharged, avoiding the situation where the liquid collected during sampling is the liquid that entered the connecting pipe 11 and the water outlet from the return pipe 9, instead of the liquid around the outside of the water outlet.

[0053] After the residual liquid in the connecting pipe 11 and the outlet is discharged, the liquid outside the outlet in the tank 1 enters the outlet. At this time, the third valve 19 is closed and the second valve 20 is opened. The liquid flowing out from the sampling pipe 13 is the liquid around the outside of the outlet in the fluidization zone 6, thus ensuring the accuracy of the sampled liquid and improving the accuracy of sampling and detection.

[0054] In this embodiment, the second valve 20 and the third valve 19 are respectively provided. Of course, in other embodiments, the second valve 20 and the third valve 19 can be the same valve, and are located at the connection between the sampling pipe 13 and the drainage branch pipe 12. Specifically, a three-way valve is provided at the connection between the sampling pipe 13 and the drainage branch pipe 12. By controlling the three-way valve, the flow direction of the liquid can be controlled, thereby controlling whether the liquid in the connecting pipe 11 enters the drainage branch pipe 12 or flows directly out of the sampling pipe 13.

[0055] Example 4

[0056] This embodiment is an improvement upon the above embodiment, combining... Figure 5As shown, the water outlet component in this embodiment includes a main water outlet pipe 22 and multiple branch water outlet pipes 8, which are connected to the main water outlet pipe 22. The branch water outlet pipes 8 are inserted into the tank 1 from the right side, with their right ends extending from the right side of the tank 1. The branch water outlet pipes 8 are rotatably mounted on the tank 1. Specifically, the right side of the tank 1 has a pipe hole, and the branch water outlet pipe 8 and the pipe hole of the tank 1 are rotatably connected via a bearing. To improve the stability of the branch water outlet pipes 8, in this embodiment, the left end of the branch water outlet pipe 8 is rotatably connected to the inner wall of the tank 1. Specifically, the inner wall of the tank 1 is fixedly equipped with a bearing, and the left end of the branch water outlet pipe 8 is connected to the left inner wall of the tank 1 via a bearing. Alternatively, the left side of the inner wall of the tank 1 has a support portion for supporting the left end of the branch water outlet pipe 8. This support portion is, for example, a support groove or support block fixed to the inner wall of the tank 1, and the left end of the branch water outlet pipe 8 is movably positioned on the support portion. A sealing ring is fixed to the right side wall of the tank body 1 by screws or adhesive. The water outlet branch pipe 8 passes through the sealing ring, thus sealing the gap between the water outlet branch pipe 8 and the tank body 1, reducing or preventing water leakage at the pipe hole of the tank body 1. In this embodiment, the main water outlet pipe 22 is provided with a connector that connects to multiple water outlet branch pipes 8. The connector is inserted into the right end of the water outlet branch pipe 8 (the diameter of the connector is smaller than the diameter of the right end of the water outlet branch pipe 8). The connector and the water outlet branch pipe 8 are rotatably engaged. To reduce liquid leakage at the connector, a sealing ring can also be fixedly installed at the connector to seal the connection between the connector and the right end of the water outlet branch pipe 8. Each outlet branch pipe 8 is coaxially connected (e.g., welded or keyed) to a driven sprocket 23. A driving sprocket 25 is located on the outside of each outlet branch pipe 8. A chain 24 connects the multiple driven sprockets 23 and the driving sprocket 25. A motor (not shown) is located on the outside of the tank body 1 to drive the driving sprocket 25. In some embodiments, a speed reducer may be provided between the driving sprocket 25 and the motor, resulting in a slower speed at which the motor drives the driving sprocket 25. The connecting pipe 11 is connected to the main outlet pipe 22.

[0057] Therefore, during the water discharge process, the motor drives the drive sprocket 25 to rotate, and the drive sprocket 25 drives multiple driven sprockets 23 to rotate via the chain 24. The driven sprockets 23 drive the corresponding water outlet branch pipes 8 to rotate. The water outlet branch pipes 8 rotate laterally on the tank body 1, thereby causing the liquid on the water outlet branch pipes 8 to spray out in different directions, avoiding the problem of continuous upward spraying and the occurrence of spray dead angles due to a single direction, which is beneficial to improving the fluidization effect.

[0058] Meanwhile, during sampling, as the outlet branch pipe 8 rotates, the position of the liquid outlet hole on the outlet branch pipe 8 changes continuously with the rotation of the outlet branch pipe 8. This allows not only the liquid above the outlet branch pipe 8 to enter the outlet branch pipe 8, but also the liquid on the horizontal side and below the outlet branch pipe 8 to enter the outlet branch pipe 8. This enables sampling to be carried out on the upper, lower, left, and right sides of the outlet branch pipe 8, resulting in more uniform sampling and more accurate sampling detection.

[0059] 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 fluidized bed reactor for wastewater treatment, comprising a vertical tank, an inlet valve at the bottom of the tank, an inlet pipe connected to the inlet valve, a return pipe connected to the tank, the lower end of the return pipe connected to the inlet valve, and the upper end of the return pipe connected to a suction element located inside the tank, dividing the tank into a clear water zone above the suction element and a fluidized zone below the suction element, wherein a circulation pump is provided on the return pipe, characterized in that: The fluidization zone is equipped with multiple vertically arranged water outlets, each with multiple liquid outlet holes, and all water outlets are connected to a return pipe. Liquid drawn in by the suction device enters the inlet and each water outlet through the return pipe. Each water outlet and the return pipe is connected to a branch assembly, each branch assembly including a branch pipe and a connecting pipe. The connecting pipe connects the branch pipe and the water outlet, and the branch pipe is connected to the return pipe with a first valve at the connection point. Each connecting pipe is connected to a sampling pipe, which has a second valve. Each sampling pipe is connected to a drain branch pipe, and the ends of multiple drain branch pipes furthest from the sampling pipes are connected to a main drain pipe, which is connected to the bottom of the return pipe. Each drain branch pipe has a third valve.

2. The fluidized bed reactor for wastewater treatment according to claim 1, characterized in that: The sampling tube is connected to a sampling box at the end furthest from the connecting tube.

3. A fluidized bed reactor for wastewater treatment according to claim 1, characterized in that: The water-absorbing component includes a water-absorbing pipe, and the water-absorbing pipe is provided with a horizontal water-absorbing port.

4. A fluidized bed reactor for wastewater treatment according to claim 1, characterized in that: The water outlet component includes a main water outlet pipe and multiple branch water outlet pipes, which are connected to the main water outlet pipe.

5. A fluidized bed reactor for wastewater treatment according to claim 1, characterized in that: The circulating pump is located between the topmost first valve and the suction element.

6. A fluidized bed reactor for wastewater treatment according to claim 1, characterized in that: The outlet of the water inlet is inclined at 15-20° to the horizontal plane.

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