Fluidized bed reactor for sewage treatment

Abstract

The invention relates to the field of sewage treatment, in particular to a fluidized bed reactor for sewage treatment, which comprises a vertical tank body, the bottom of the tank body is provided with a water feeder, the water feeder is connected with a water inlet pipe, the tank body is connected with a reflux pipeline, the lower end of the reflux pipeline is connected with the water feeder, and the higher end of the reflux pipeline is connected with a water absorption piece. The water absorption piece is located in the tank body and divides the interior of the tank body into a clear water area located above the water absorption piece and a fluidization area located below the water absorption piece, a circulating pump is arranged on the backflow pipeline, the fluidization area is provided with a plurality of water outlet pieces which are vertically arranged, a plurality of liquid outlet holes are formed in the water outlet pieces, and the water outlet pieces are all communicated with the backflow pipeline; and liquid sucked by the water suction piece enters the water inlet device and each water outlet piece through the backflow pipeline. According to the scheme, the problem that the fluidization effect of the middle of the fluidization area is poor is solved, and the fluidization effect of the middle of the fluidization area is improved.

Description

Technical Field

[0001] The invention relates to the field of sewage treatment, and in particular to a fluidized bed reactor for sewage treatment. Background Art

[0002] Sulfur autotrophic microorganisms in anaerobic or anoxic environments use inorganic carbon (CO3 2- 、HCO3 - ) as carbon source, and reduced sulfur compounds as electron donors, converting nitrite (NO2 - -N) or nitrate (NO3 - The process of reducing sulfur-containing materials 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 water and groundwater, and drinking water.

[0003] The fluidized bed reactor is a device used in the sulfur autotrophic denitrification wastewater treatment process. The fluidized bed reactor includes a tank body, the interior of the tank body is filled with fillers (the fillers are usually sulfur powder), the tank body is divided into a fluidizing zone and a clean water zone, the clean water zone and the fluidizing zone are connected, the clean water zone is located above the fluidizing zone, the fillers are located in the fluidizing zone, a water inlet is provided at the bottom of the tank body, the water inlet is connected to the water inlet pipe of the tank body, a fluidizing water outlet is provided at the top of the fluidizing zone, the fluidizing water outlet is connected to the water inlet through a reflux pipe, and a circulating pump is provided on the reflux pipe.

[0004] Therefore, nitrite (NO2 - -N) or nitrate (NO3 - -N) enters the water inlet through the water inlet pipe, and the sewage flows out of the water inlet and flows upward continuously. The sewage and SO undergo sulfur autotrophic denitrification in the fluidized area, and the purified water is located in the clean water area at the top of the tank. The circulating pump sucks the water at the top of the fluidized area into the return pipe, and the liquid in the return pipe flows into the water inlet and sprays out from the water inlet, thereby realizing the circulation of water. The water sprays upward from the water inlet, and the water supply has an upward impact force. At the same time, the return pipe absorbs water from the top of the fluidized area, and the water at the top of the fluidized area flows into the return pipe. In this way, the water at the bottom of the tank is under the action of impact force and the water at the top of the fluidized area is under the action of suction, so that SO and sewage are better mixed and reacted, reducing the sinking of SO and improving the fluidization effect.

[0005] Since the bottom of the fluidized zone is subject to the upward impact of the water inlet and the top of the fluidized zone is subject to the suction of the reflux pipe, both the top and bottom of the fluidized zone are subject to force. However, the middle of the fluidized zone is calmer and gentler than the top and bottom of the fluidized zone, which is not conducive to the full mixing reaction of S0 and water. The fluidization effect in the middle of the fluidized zone is poor. Summary of the invention

[0006] The present invention aims to provide a fluidized bed reactor for sewage treatment, so as 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-mentioned purpose, the present invention adopts the following technical scheme: a fluidized bed reactor for sewage treatment, comprising a vertical tank body, a water inlet is provided at the bottom of the tank body, a water inlet pipe is connected to the water inlet, a return pipe is connected to the tank body, the lower end of the return pipe is connected to the water inlet, and the high end of the return pipe is connected to a water absorbing member, the water absorbing member is located inside the tank body and divides the inner part of the tank body into a clear water area located above the water absorbing member and a fluidizing area located below the water absorbing member, a circulating pump is provided on the return pipe, and a plurality of vertically arranged water outlet members are provided in the fluidizing area, a plurality of liquid outlet holes are provided on the water outlet members, and the water outlet members are all connected to the return pipe; the liquid sucked in by the water absorbing member enters the water inlet and each water outlet member through the return pipe.

[0008] The principle and advantage of the above scheme of the present application are: containing nitrite (NO2 - -N) or nitrate (NO3 - -N) enters the water inlet through the water inlet pipe, and the sewage flows out of the water inlet and continues to flow upward. The sewage and SO2 undergo sulfur autotrophic denitrification in the fluidized area, and the purified water is located in the clear water area at the top of the tank.

[0009] The circulating pump sucks the water at the top of the fluidized area into the return pipe through the water absorbing member, and flows into the water inlet, and sprays out from the water inlet, thereby realizing the circulation of water. The water sucked into the return pipe by the water absorbing member and the water in the water inlet pipe are sprayed out obliquely upward from the water inlet together. Compared with the case where only the water in the water inlet pipe is sprayed obliquely upward from the water inlet, the amount of water sprayed obliquely upward from the water inlet is greater, and the upward impact force on the liquid in the fluidized area is greater, which is conducive to the upward flow of water in the fluidized area, so that the water and the filler are fully mixed, thereby helping to improve the fluidization effect of the fluidized area.

[0010] At the same time, the return pipe absorbs 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 beneficial to the upward flow of water in the fluidized zone, so that SO2 and sewage can be mixed better, reducing the sinking of SO2 and improving the fluidization effect.

[0011] In addition, since the water outlet parts are all connected to the return pipe, the liquid that enters the return pipe from the water absorption part also enters the water outlet parts at different heights, and the liquid flows out from the water outlet parts at different heights. The liquid flowing out of the water outlet parts can impact the liquid at different heights, so that the positions at different heights in the middle of the fluidizing zone can also be affected by the impact force and are no longer relatively calm, which is beneficial to the mixed contact of water and filler in the middle of the fluidizing zone. Compared with the phenomenon in the prior art that only the top and bottom of the fluidizing zone are subjected to greater force and the middle of the fluidizing zone is subjected to weaker force, the problem of poor fluidization effect in the middle of the fluidizing zone is solved, and the fluidization effect in the middle of the fluidizing zone is improved.

[0012] In summary, the scheme of the present application sprays liquid upward at an angle through the water inlet and outlet to impact and swirl the liquid at the bottom of the fluidizing zone, the water absorbing element absorbs liquid from the top of the fluidizing zone and has suction on the liquid, and the water outlet element impacts the liquid at different heights in the fluidizing zone. In this way, different parts of the entire fluidizing zone are basically subjected to force and are no longer calm and gentle, thereby greatly improving the overall fluidization effect of the entire fluidized bed reaction zone.

[0013] Preferably, as an improvement, a branch assembly is connected between each water outlet and the return pipe, and the branch assembly includes a branch pipe and a connecting pipe. The connecting pipe is connected between the branch pipe and the water outlet, and the branch pipe is connected to the return pipe and a first valve is provided at the connecting portion.

[0014] Therefore, the connecting pipe plays the role of connecting the water outlet and the branch pipe, so that the liquid in the return pipe enters different branch pipes, and enters the connecting pipe from the branch pipe, and then enters the water outlet. The first valve is set to control whether the branch pipe is opened and closed, and whether the liquid in the return pipe enters the branch pipe, so as to control whether the corresponding water outlet discharges water. At the same time, by controlling the opening size of the first valve, the liquid flow rate in the branch pipe is controlled, so that the liquid outflow speed of the water outlet at different heights is different, so that the liquid flow rate can be adjusted in a targeted manner at different heights. For example, the outlet close to the water inlet (or water absorbing part) will be affected by the water inlet or the water absorbing part, and the outflow speed of the water outlet here is set relatively small, while the outlet far away from the water inlet (or water absorbing part) is less affected by the water inlet or the water absorbing part, and the outflow speed of the water outlet at this position is set relatively large, so that the fluidization effect at different heights of the tank body is not much different.

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

[0016] In the sewage treatment process, it is necessary to sample and test the liquid at different heights in the fluidized area to detect whether the fluidization effect meets the requirements. Therefore, when it is necessary to sample the liquid at different heights in the fluidized area, close the first valve to stop the liquid in the reflux pipe from entering the branch pipe. At the same time, open the second valve (the second valve is used to control whether there is liquid flowing out of the sampling pipe), and the liquid at the corresponding height flows back into the water outlet, and flows into the sampling pipe through the connecting pipe, and finally flows out of the sampling pipe, thereby realizing the sampling of the liquid at the corresponding height.

[0017] The water outlet in this solution is located in the tank body. The water outlet not only serves to discharge water, but also serves to collect liquid at a corresponding height in the tank body during the sampling process. Since the water outlet extends into the tank body, liquid in different transverse parts of the tank body enters the water outlet, so that the liquid flowing out of the sampling tube is liquid in different transverse parts of the tank body, so that the sampled liquid comes from different transverse parts of the tank body, and the sampling of liquid in different transverse parts of the water outlet is realized. The sampled liquid will not be concentrated in a certain part of the tank body, which is conducive to improving the accuracy of sampling and detection.

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

[0019] Since the liquid in the water outlet part comes directly from the liquid in the return pipe during the water outlet process, and the liquid in the return pipe comes directly from the water absorbing part, if sampling is performed directly, the collected liquid is not the liquid outside the water outlet part in the tank body, but the liquid that has just entered the water outlet part from the return pipe. These liquids all come from the water absorbing part, which leads to a large error in sampling detection. In order to solve this problem, the inventors set up the above structure, so that before sampling, the first valve and the second valve are closed first, and the third valve is opened, and the liquid in the connecting pipe and the water outlet part enters the drainage branch pipe, and the liquid enters the drainage main pipe from the drainage branch pipe, and flows back to the bottom of the return pipe along the drainage main pipe, and finally enters the water inlet. In this way, the discharge of the liquid entering from the return pipe in the connecting pipe and the water outlet part before sampling is realized, and it is avoided that the liquid collected during sampling is the liquid entering from the return pipe into the connecting pipe and the water outlet part, rather than the liquid around the outside of the water outlet part. When the retained liquid in the connecting pipe and the water outlet is discharged, the liquid outside the water outlet enters the water outlet. At this time, the third valve is closed and the second valve is opened. The liquid flowing out of the sampling tube is the liquid outside the water outlet in the fluidizing area, thereby ensuring the accuracy of the sampled liquid and facilitating improving the accuracy of sampling detection.

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

[0021] Therefore, by controlling the same valve (the same valve is, for example, a three-way valve), the flow direction of the liquid in the connecting pipe is controlled, and whether the liquid flows out of the sampling tube or flows into the drainage branch pipe is controlled. In this way, there is no need to set up two valves, and there is no need to control the two valves separately. The setting is simple and the operation is convenient.

[0022] Preferably, as an improvement, the end of the sampling tube away from the connecting tube is connected to a sampling box, so that the liquid flowing out of the sampling tube automatically enters the sampling box, thereby realizing the collection of the sampled liquid.

[0023] Preferably, as an improvement, the water absorbing member comprises a water absorbing pipe, and a transverse water absorbing port is provided on the water absorbing pipe.

[0024] Thus, the liquid in the tank body enters the water absorbing member through the water suction port. The water suction port on the water absorbing member is arranged horizontally, rather than vertically downward, and the horizontally arranged water suction port is inconsistent with the direction of the water flowing vertically upward, so that the water flowing vertically upward can be prevented from directly entering the water suction port to bring in more sulfur powder to a certain extent, so that only a small amount of sulfur powder enters the return pipe, avoiding a large amount of sulfur powder entering the return pipe and clogging it.

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

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

[0027] Preferably, as an improvement, the circulation pump is located between the top first valve and the water absorbing member. Thus, by arranging the circulation pump here, the circulation pump can supply liquid to the return pipe and all branch components and provide power for liquid flow, which can reduce the number of circulation pumps used.

[0028] Preferably, as an improvement, the water outlet of the water inlet is inclined at 15-20° to the horizontal plane. The water outlet at this angle allows the water to be sprayed out at an angle, thereby providing an upward impact force and a tangential force, ensuring sufficient fluidization of the filler in the fluidized zone, enhancing the contact and mixing of sewage and sulfur powder, improving the cultivation efficiency of granular sludge, and making the sulfur autotrophic denitrification reaction more sufficient. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0030] Figure 2 for Figure 1 A is an enlarged view of the middle image.

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

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

[0033] Figure 5 This is a top view of the water outlet part in the tank body in Example 4. DETAILED DESCRIPTION

[0034] The following is further described in detail through specific implementation methods: The figure marks in the drawings of the specification include: tank body 1, base 2, water inlet pipe 3, water inlet 4, filler 5, fluidization area 6, clean water area 7, water outlet branch pipe 8, reflux pipe 9, circulation pump 10, connecting pipe 11, drainage branch pipe 12, sampling pipe 13, sampling box 14, drainage main pipe 15, first valve 16, branch pipe 17, water absorption part 18, third valve 19, second valve 20, water suction port 21, water outlet main pipe 22, driven sprocket 23, chain 24, driving sprocket 25.

[0035] Example 1 Basically as attached Figure 1-Figure 4 As shown: A fluidized bed reactor for sewage treatment, including a vertical tank body 1, the tank body 1 is circular in shape when viewed from above, and a base 2 is installed at the bottom of the tank body 1. The arrangement of the base 2 improves the stability of the tank body 1. A water inlet 4 is installed at the bottom of the tank body 1. The water inlet 4 is a cyclone water inlet. The water outlet of the water inlet 4 (the water outlet is a nozzle) is inclined upward at 15-20° with the horizontal plane. The water inlet pipe 3 is connected to the water inlet 4, and the water inlet pipe 3 is located on the left side of the tank body 1. In this embodiment, the water outlet of the cyclone water inlet is inclined at 15-20°. The reason for this arrangement is that the water outlet at this angle can provide upward impact force and tangential force, ensure the full fluidization of the filler in the fluidized zone, enhance the contact and mixing of sewage and sulfur powder, improve the cultivation efficiency of granular sludge, and make the sulfur autotrophic denitrification reaction more sufficient.

[0036] The tank body 1 is connected with a return pipe 9, which is 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 water absorbing member 18. The water absorbing member 18 is located inside the tank body 1 and divides the inside of the tank body 1 into a clean water area 7 located above the water absorbing member 18 and a fluidized area 6 located below the water absorbing member 18. The fluidized area 6 is filled with a filler 5, which is sulfur powder. The water absorbing member 18 in this embodiment is specifically a water absorbing pipe, combined with Figure 3 As shown, a transversely arranged water suction port 21 is provided on the side wall of the water suction pipe. The number of the water suction pipes can be multiple, and the multiple water suction pipes are connected to each other in a certain shape. The specific shape formed by the multiple water suction pipes is not important, and the multiple water suction pipes can be connected in various shapes, such as multiple water suction pipes are arranged in parallel and connected (connected head to tail in sequence, or connected head to head and tail to tail); or the ends of multiple water suction pipes are connected to form a central radial shape, in which case the connection and communication parts of the multiple water suction pipes are located in the center of the radial shape.

[0037] 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. This embodiment shows one. The fluidized area 6 is provided with a plurality of vertically arranged water outlets. The number of water outlets in this embodiment is four. The water outlet is provided with a plurality of liquid outlet holes, and the water outlets are all connected to the return pipe 9. The liquid sucked by the water absorbing member 18 enters the water inlet 4 and each water outlet through the return pipe 9. Specifically, in combination with Figure 4 As shown, the water outlet member in this embodiment includes a plurality of water outlet branch pipes 8, and the plurality of water outlet branch pipes 8 are connected. The connection mode of the plurality of water outlet branch pipes 8 can be parallel (the water outlet branch pipes 8 are arranged in parallel and the ends are connected) or series (the water outlet branch pipes 8 are arranged in parallel and the ends are connected in sequence). The connection mode of the plurality of water outlet branch pipes 8 can also be other modes. The shape of the water outlet member formed by the plurality of water outlet branch pipes 8 is not important, and any shape is acceptable. In this embodiment, the shape of the water outlet member formed by the plurality of water outlet branch pipes 8 is as follows: Figure 4As shown, the lateral part of the water outlet can extend as far as possible to the left to different lateral parts of the liquid, and different water outlet branches 8 are located at different lateral parts in the front and rear directions of the tank body. In this embodiment, the top view of the tank body 1 is circular, and the lengths of each water outlet branch 8 are different. The closer to the diameter of the tank body 1, the longer the water outlet branch 8. In order to improve the stability of the water outlet branch 8, the left end of the water outlet branch 8 is connected to the inner wall of the tank body 1 in this embodiment, and the connection method can be welding or clamping. When clamping, the inner wall of the left side of the tank body 1 is provided with a clamping groove, and the left end of the water outlet branch 8 is clamped in the clamping groove. The water outlet branch 8 is provided with a liquid outlet hole, and the liquid outlet hole is located on the upper surface of the water outlet branch 8. A branch assembly is connected between each water outlet and the return pipe 9. The branch assembly in this embodiment 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 position. Since the number of water outlet parts in this embodiment is four, the number of branch circuit components in this embodiment is four, and the four branch circuit components are also arranged from top to bottom.

[0038] Therefore, nitrite (NO2 - -N) or nitrate (NO3 - -N) enters the water inlet 4 through the water inlet pipe 3, the sewage flows out from the water inlet 4 obliquely upward and continuously flows upward, the sewage and SO undergo sulfur autotrophic denitrification in the fluidized zone 6, and the purified water overflows to the clean water zone 7. The water in the clean water zone 7 is more stable and cleaner than the liquid in the sulfidation zone 6.

[0039] At the same time, the circulation pump 10 is started, and the water at the top of the fluidized area 6 enters the water absorbing member 18 laterally through the horizontal water suction port 21, and flows rightward into the return pipe 9 through the water absorbing member 18. A part of the liquid in the return pipe 9 enters the four branch components, and a part flows downward to the bottom of the return pipe 9, and flows back into the water inlet 4, and is sprayed out from the water inlet 4. In this way, a part of the water sprayed out of the water inlet 4 comes from the water inlet pipe 3, and a part comes from the return pipe 9. Compared with only the water in the water inlet pipe 3 being sprayed out from the water inlet 4, the amount of water sprayed out of the water inlet 4 is greater, and the water sprayed out of the water inlet 4 is more sufficient, and the upward impact force of the water in the fluidized area 6 is greater, which is conducive to the upward flow of water in the fluidized area 6, so that the water and the filler 5 are fully mixed, thereby helping to improve the fluidization effect of the fluidized area 6.

[0040] The water at the top of the fluidized zone 6 is sucked by the water absorbing member 18, and the water absorbing member 18 has an upward suction force on the water in the fluidized zone 6 as a whole. In this way, the water absorbing member 18 at the top of the fluidized zone 6 sucks the water upward, and the water inlet 4 at the bottom of the fluidized zone 6 sprays the water upward at an angle, which is conducive to the upward flow of water in the fluidized zone 6, so that SO and sewage can be mixed and reacted better, the sinking of SO is reduced, and the fluidization effect is improved.

[0041] In addition, the liquid in the reflux pipe 9 flows to the left into each branch component, and the liquid in each branch component flows into the corresponding water outlet parts, and the liquid flows out from the water outlet parts at different heights. The liquid flowing out from the water outlet parts can impact the liquid at different heights of the fluidizing zone 6, so that the positions at different heights in the middle of the fluidizing zone 6 can also be impacted and no longer calm, which is beneficial to the mixed contact of water and filler 5. Compared with the prior art where only the top and bottom of the fluidizing zone 6 are subjected to greater force, while the middle part of the fluidizing zone 6 is subjected to weaker force, the problem of poor fluidization effect in the middle part of the fluidizing zone 6 is solved, and the fluidization effect in the middle part of the fluidizing zone 6 is improved.

[0042] Example 2 This embodiment is further improved on the basis of embodiment 1. Figure 1 , Figure 2 As shown, in this embodiment, the connection tube 11 is connected to a sampling tube 13, and a second valve 20 is provided on the sampling tube 13. One end of the sampling tube 13 away from the connection tube 11 is connected to a sampling box 14.

[0043] Therefore, during the normal fluidization process, the second valve 20 is in a closed state, the first valve 16 is in an open state, liquid flows out of the water outlet, and liquid does not flow out of the sampling tube 13 .

[0044] When it is necessary to sample the liquid at different heights of the tank body 1 to detect the fluidization effect of the liquid at different heights in the tank body 1, the first valve 16 at the corresponding height is closed, and the liquid in the reflux pipe 9 stops entering the branch pipe 17. Then the second valve 20 is opened, and the liquid around the water outlet at the corresponding height enters the water outlet through the liquid outlet hole of the water outlet, flows to the right into the connecting pipe 11, and finally flows out from the sampling pipe 13, thereby realizing the sampling of the liquid at the corresponding height.

[0045] The water outlet component in this embodiment is provided with different numbers of water outlet branch pipes 8 arranged in front and back, and different water outlet branch pipes 8 are located at different transverse positions of the tank body 1. In this way, during the sampling process, liquid at different transverse positions in the tank body 1 at corresponding heights enters the water outlet component, and the liquid flowing out of the sampling tube 13 is the liquid at different transverse positions of the tank body 1, so that the sampled liquid comes from different positions in the tank body 1, and the sampling of liquid at different transverse positions of the water outlet component is realized. The sampled liquid will not be concentrated in a certain position in the tank body 1, which is conducive to improving the accuracy of sampling detection.

[0046] Example 3 Before sampling, since 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 absorbing part 18 (the water in the water absorbing part 18 comes from the top of the fluidizing area 6), if sampling is performed directly, the collected liquid is not the liquid on the outside of the water outlet, but the liquid that has just entered the water outlet from the return pipe 9, which will cause a large error in sampling detection.

[0047] Therefore, in order to solve the above problems, this embodiment is further improved on the basis of embodiment 2. In this embodiment, the sampling tubes 13 are all connected with drainage branches 12, and the ends of the plurality of drainage branches 12 away from the sampling tubes 13 are connected with a drainage main pipe 15, and the drainage main pipe 15 is connected to the bottom of the reflux pipe 9. The drainage branches 12 are all provided with a third valve 19.

[0048] 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 part enters the drainage branch pipe 12 along the connecting pipe 11 and the sampling pipe 13. The liquid enters the drainage main pipe 15 from the drainage branch pipe 12, and flows back to the bottom of the reflux pipe 9 along the drainage main pipe 15, and finally enters the water inlet 4. In this way, the liquid entering from the reflux pipe 9 in the connecting pipe 11 and the water outlet part before sampling is discharged, so as to avoid that the liquid collected during sampling is the liquid entering from the reflux pipe 9 into the connecting pipe 11 and the water outlet part, rather than the liquid around the outer side of the water outlet part.

[0049] When the remaining liquid in the connecting pipe 11 and the water outlet is discharged, the liquid outside the water outlet in the tank body 1 enters the water outlet. At this time, the third valve 19 is closed and the second valve 20 is opened. The liquid flowing out of the sampling tube 13 is the liquid around the outside of the water outlet in the fluidizing area 6, thereby ensuring the accuracy of the sampled liquid and facilitating improving the accuracy of sampling detection.

[0050] In this embodiment, the second valve 20 and the third valve 19 are provided separately. 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 part of the sampling tube 13 and the drainage branch pipe 12. Specifically, a three-way valve is provided at the connection part of the sampling tube 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 tube 11 enters the drainage branch pipe 12 or flows directly out of the sampling tube 13.

[0051] Example 4 This embodiment is improved on the basis of the above embodiment. Figure 5As shown, the water outlet part in this embodiment includes a water outlet main pipe 22 and a plurality of water outlet branch pipes 8, and the water outlet branch pipes 8 are connected to the water outlet main pipe 22. The water outlet branch pipe 8 is inserted into the tank body 1 from the right side of the tank body 1, and the right end of the water outlet branch pipe 8 extends from the right side of the tank body 1. The water outlet branch pipe 8 is rotatably arranged on the tank body 1, and the specific rotation method is: a pipe hole is arranged on the right side of the tank body 1, and the water outlet branch pipe 8 and the pipe hole of the tank body 1 are rotatably connected through a bearing. In order to improve the setting stability of the water outlet branch pipe 8, the left end of the water outlet branch pipe 8 in this embodiment is rotatably connected to the inner wall of the tank body 1, and the specific rotation connection method is: a bearing is fixedly arranged on the inner wall of the tank body 1, and the left end of the water outlet branch pipe 8 is connected to the left inner wall of the tank body 1 through a bearing, or a support part for supporting the left end of the water outlet branch pipe 8 is arranged on the left side of the inner wall of the tank body 1, and the support part is, for example, a support groove or a support block fixed on the inner wall of the tank body 1, and the left end of the water outlet branch pipe 8 is movably placed on the support part. A sealing ring is fixed or bonded on the right side wall of the tank body 1 by screws, and the water outlet branch pipe 8 passes through the sealing ring, so that the gap between the water outlet branch pipe 8 and the tank body 1 is blocked by the sealing ring, reducing or avoiding water leakage at the pipe hole of the tank body 1. The water outlet main pipe 22 in this embodiment is provided with a connector connected to a plurality of water outlet branch pipes 8, and 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), and the connector and the water outlet branch pipe 8 are rotatably matched. In order to reduce liquid leakage at the connector, a sealing ring can also be fixedly provided at the connector to seal the connection between the connector and the right end of the water outlet branch pipe 8. A driven sprocket 23 is coaxially connected (for example, welded or keyed) to each outlet branch pipe 8, a driving sprocket 25 is provided on the outside of the outlet branch pipe 8, a chain 24 is connected between the driven sprockets 23 and the driving sprocket 25, a motor (not shown in the figure) for driving the driving sprocket 25 to rotate is provided on the outside of the tank body 1, and in some embodiments, a reducer can be provided between the driving sprocket 25 and the motor, so that the speed at which the motor drives the driving sprocket 25 is slow. The connecting pipe 11 is connected to the outlet main pipe 22.

[0052] Therefore, during the water outlet process, the water outlet part drives the active sprocket 25 to rotate through the motor, the active sprocket 25 drives multiple driven sprockets 23 to rotate through the chain 24, the driven sprocket 23 drives the corresponding water outlet branch pipe 8 to rotate, and the water outlet branch pipe 8 rotates horizontally on the tank body 1, so that the liquid on the water outlet branch pipe 8 is sprayed out in different directions, avoiding the problem of continuous upward spraying in a single direction and forming a dead angle of spraying, which is beneficial to improving the fluidization effect.

[0053] At the same time, during sampling, the liquid outlet hole on the water outlet branch pipe 8 keeps changing position as the water outlet branch pipe 8 rotates, so that not only the liquid above the water outlet branch pipe 8 can enter the water outlet branch pipe 8, but also the liquid on the lateral sides and below of the water outlet branch pipe 8 can enter the water outlet branch pipe 8, thereby realizing sampling on the upper and lower sides and left and right sides of the water outlet branch pipe 8, making the sampling more uniform and the sampling detection more accurate.

[0054] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A fluidized bed reactor for sewage treatment, comprising a vertical tank body, a water inlet is provided at the bottom of the tank body, a water inlet pipe is connected to the water inlet, a return pipe is connected to the tank body, the lower end of the return pipe is connected to the water inlet, the upper end of the return pipe is connected to a water absorbing member, the water absorbing member is located inside the tank body and divides the inner part of the tank body into a clear water area located above the water absorbing member and a fluidized area located below the water absorbing member, a circulating pump is provided on the return pipe, and the characteristics are: The fluidized area is provided with a plurality of vertically arranged water outlet parts, each of which is provided with a plurality of liquid outlet holes, and each of the water outlet parts is connected with a return pipe; the liquid sucked by the water absorbing part enters the water inlet and each water outlet part through the return pipe.

2. A fluidized bed reactor for sewage treatment according to claim 1, characterized in that: A branch assembly is connected between each water outlet and the return pipe. The branch assembly includes a branch pipe and a connecting pipe. The connecting pipe is connected between the branch pipe and the water outlet. The branch pipe is connected to the return pipe and a first valve is provided at the connecting position.

3. A fluidized bed reactor for sewage treatment according to claim 2, characterized in that: The connecting pipes are all connected with sampling pipes, and the sampling pipes are provided with a second valve.

4. A fluidized bed reactor for sewage treatment according to claim 3, characterized in that: The sampling tubes are all connected with drainage branches, and the ends of the multiple drainage branches away from the sampling tubes are connected with a drainage main pipe, and the drainage main pipe is connected to the bottom of the reflux pipe; the drainage branches are all provided with a third valve.

5. A fluidized bed reactor for sewage treatment according to claim 4, characterized in that: The second valve and the third valve are the same valve and are located at the connection position between the sampling pipe and the drainage branch pipe.

6. A fluidized bed reactor for sewage treatment according to claim 3, characterized in that: The end of the sampling tube away from the connecting tube is connected with a sampling box.

7. A fluidized bed reactor for sewage treatment according to claim 1, characterized in that: The water absorbing member comprises a water absorbing pipe, and a transverse water absorbing port is arranged on the water absorbing pipe.

8. A fluidized bed reactor for sewage treatment according to claim 1, characterized in that: The water outlet component comprises a main water outlet pipe and a plurality of branch water outlet pipes, and the branch water outlet pipes are connected to the main water outlet pipe.

9. A fluidized bed reactor for sewage treatment according to claim 2, characterized in that: The circulation pump is located between the uppermost first valve and the water absorbing member.

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

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