Wastewater phosphorus removal system and wastewater phosphorus removal process

Abstract

The present invention discloses a wastewater phosphorus removal system and a wastewater phosphorus removal process, which includes a reaction unit. The reaction unit includes a cylinder body, a plurality of reaction tubes and a diversion tube. End caps are installed at both ends of the cylinder body. The reaction tubes pass through the cylinder body, and both ends of the reaction tubes respectively penetrate through the two end caps. The diversion tube passes through the cylinder body, and both ends of the diversion tube respectively penetrate through the two end caps. Both the reaction tubes and the diversion tube are hermetically connected to the end caps. A heat exchange pipeline is connected to the outside of the cylinder body. The heat exchange pipeline communicates with the cavities between the inner wall of the cylinder body and the outer walls of the reaction tubes and the diversion tube for the circulation of a heat exchange medium. Compared with the original traditional wastewater phosphorus removal process method, the present invention can greatly shorten the reaction time between the medicament and the wastewater. At the same time, the process device has the advantages of small floor area, high treatment efficiency and low treatment cost.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and more specifically, to a wastewater phosphorus removal system with the microchannel reaction device, and also relates to a wastewater phosphorus removal treatment process. Background Art

[0002] Phosphorus-containing wastewater refers to wastewater containing inorganic phosphates or organic phosphorus compounds. Such wastewater mainly comes from multiple industries, including fertilizer production, agricultural waste, domestic sewage, medicine and medical care, food and other industries, and is one of the most widespread types of sewage in the industrial sector.

[0003] During the process of wastewater phosphorus removal, enterprises first use the chemical precipitation method for treatment. After reducing the phosphorus concentration in the wastewater to a certain level, they then combine methods such as the biological method or adsorption method for in-depth treatment to ensure that the wastewater meets the discharge standards. During the treatment process of the chemical precipitation method, corresponding agents need to be added to the wastewater so that the phosphorus-containing substances in the wastewater can be solidified and form a sediment state. During the treatment process, it is necessary to add the wastewater and the agent into the stirring kettle at the same time. Through mixing and stirring, the wastewater and the agent can be fully mixed, and a relatively long time is required during the mixing process. Moreover, due to the large volume of the stirring kettle and the large amount of wastewater and agent added to the stirring kettle at the same time, on the one hand, the mixing efficiency of the two is low, and on the other hand, some reactions need to be heat-exchanged to maintain a better reaction temperature. The total amount of wastewater and agent is large, and it is impossible to carry out sufficient and uniform heat exchange on it, affecting the temperature control efficiency and also restricting the reaction efficiency to a certain extent.

[0004] Therefore, a new solution needs to be proposed to solve this problem. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a wastewater phosphorus removal system that can shorten the reaction time between the wastewater and the treatment agent and improve the efficiency of wastewater treatment.

[0006] To achieve the above purpose, the present invention adopts the following technical solution: A wastewater phosphorus removal system includes a reaction unit. The reaction unit includes a cylinder body, a plurality of reaction tubes and a diversion tube. End caps are installed at both ends of the cylinder body. The reaction tubes pass through the cylinder body, and both ends of the reaction tubes respectively penetrate through the two end caps. The diversion tube passes through the cylinder body, and both ends of the diversion tube respectively penetrate through the two end caps. The reaction tubes and the diversion tube are both hermetically connected to the end caps. An external heat exchange pipeline is connected to the outside of the cylinder body. The heat exchange pipeline communicates with the cavities between the inner wall of the cylinder body and the outer walls of the reaction tubes and the diversion tube for the circulation of the heat exchange medium.

[0007] The present invention is further configured such that a plurality of the reaction units are provided and connected in sequence; an extension cylinder is fixedly connected to the end face of the end cap facing the outside of the cylinder body, and the extension cylinders of adjacent two reaction units are covered with each other to form a chamber between the two end caps; the end of the reaction tube extends into the chamber between the two end caps and is communicated with the chamber.

[0008] The present invention is further configured such that a partition is fixedly installed in the chamber, the partition is arranged parallel to the end cap, and the partition divides the chamber into two parts on the left and right, namely a liquid inlet chamber close to the input side and a liquid outlet chamber close to the output side; there is a gap between the lower part of the partition and the inner circumference of the extension cylinder, and a communication chamber communicating the liquid inlet chamber and the liquid outlet chamber is formed on the lower side of the partition.

[0009] The present invention is further configured such that the end of the diversion tube extends into the chamber and is communicated with the chamber; the diameter of the diversion tube is larger than the diameter of the reaction tube for allowing the reaction precipitate to pass through.

[0010] The present invention is further configured such that the two ends of the diversion tube are respectively a first port and a second port, the first port extends into the liquid inlet chamber, and the second port extends into the liquid outlet chamber.

[0011] The present invention is further configured such that the diversion tubes are arranged side by side, and adjacent diversion tubes are abutted and sealed to divide the liquid outlet chamber and the communication chamber up and down; the arc-shaped extension part is connected to the lower side part of the partition and is hermetically connected to the lower side of the partition.

[0012] The present invention is further configured such that an arc-shaped extension part is fixedly connected to the end of the second port, the arc-shaped extension part is in a semi-circular structure and is located in the upper half of the second port, and a plurality of filter holes are formed in the arc-shaped extension part.

[0013] The present invention is further configured such that a diversion device is arranged in the communication chamber, the diversion device is driven by a driving rod and can be adjusted along the axial direction of the diversion tube, the two ends of the driving rod penetrate through the end cap and are hermetically and slidably connected to the end cap; the diversion device includes a cover plate, the cover plate is located in the liquid inlet chamber and is used for abutting against the outside of the first port and can seal the first port, and the cover plate can abut against the second port of the diversion tube to realize stroke limitation;

[0014] The present invention is further configured such that an upper eaves portion is fixedly connected to the upper side of the cover plate facing the first port, the upper eaves portion is hermetically connected to the outside of the first port, and a downward opening portion is formed on the side of the cover plate facing the first port; a semi-cylindrical tube is fixedly connected to the side of the cover plate facing the second port, the semi-cylindrical tube is slidably and hermetically adapted to the inner peripheral wall of the second port and is located in the lower half; the semi-cylindrical tube extends into the inner circumference of the second port and can be slidably adjusted along the axial direction; a through groove is formed on the side of the semi-cylindrical tube close to the cover plate, and the through groove can be adjusted for opening and closing.

[0015] The present invention is further configured such that the through groove is located on the lower side of the semi-cylindrical tube, the through groove is arranged along the axial direction, a sliding cover is installed on the upper side of the through groove, the sliding cover is used to hermetically cover the through groove, the sliding cover is arc-shaped and adapted to the inner peripheral wall of the semi-cylindrical tube and can be slidably adjusted along the axial direction of the semi-cylindrical tube;

[0016] The present invention is further configured such that a guiding sliding portion is fixedly connected to the lower side of the sliding cover, the guiding sliding portion is slidably adapted to the through groove, a connecting rod portion is fixedly connected to the lower side of the guiding sliding portion, the connecting rod portion is fixedly connected to both the guiding sliding portion and the driving rod, the driving rod is used to drive the sliding cover to slide, and when the sliding cover slides to the limit position in the through groove, it can drive the cover plate and the semi-cylindrical tube to move.

[0017] The present invention is further configured to further include a static mixer, a waste water tank, a chemical agent tank, a stirring kettle, a sedimentation tank, and a PAM buffer tank. The waste water tank and the chemical agent tank are respectively connected to the static mixer through pipelines. The static mixer is connected to the inlet end of the microchannel reactor. The outlet end of the microchannel reactor is connected to the stirring kettle. The stirring kettle is connected to the sedimentation tank through a pipeline. The PAM buffer tank is connected to the stirring kettle through a pipeline.

[0018] The present invention also provides a waste water phosphorus removal treatment process, which uses the waste water phosphorus removal system as described above to carry out phosphorus removal treatment on waste water.

[0019] In summary, the present invention has the following beneficial effects:

[0020] Through the multi-tubular reaction tubes of the present invention, a reaction structure with channels formed by the reaction tubes can increase the mixing degree of waste water and chemical agents, increase the relative contact area between the two fluid streams, make the fluid mixing sufficient, and greatly shorten the reaction time between the chemical agent and the waste water; at the same time, due to the more sufficient heat exchange efficiency between the reaction tubes of the microchannels and the heat exchange reagent in the external chamber, the waste water and the chemical agent can always be maintained in a high-efficiency reaction temperature range, thereby improving the reaction treatment efficiency of the waste water; in addition, due to the use of channels with smaller apertures, the total amount of waste water and chemical agents in the reactor is less, which can greatly reduce the reaction and treatment risks and improve the safety of the treatment process. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of a wastewater phosphorus removal system in this embodiment;

[0022] Figure 2 It is a schematic structural diagram of the connection of two reaction units in this embodiment Figure 1 ;

[0023] Figure 3 It is an enlarged view of the communication cavity in this embodiment Figure 1 ;

[0024] Figure 4 It is a schematic structural diagram of the second port and the partition plate in this embodiment;

[0025] Figure 5 It is a schematic structural diagram of the connection of two reaction units in this embodiment Figure 2 ;

[0026] Figure 6 It is an enlarged view of the communication cavity in this embodiment Figure 2 ;

[0027] Figure 7 It is a schematic structural diagram of the first port 29 and the cover plate 301 in this embodiment;

[0028] Figure 8 It is a schematic structural diagram of the semi-cylindrical tube and the sliding cover in this embodiment;

[0029] Figure 9 It is a schematic structural diagram of the cleaning brush in this embodiment.

[0030] Reference numerals: microchannel reactor 1; reaction unit 2; cylinder body 20; end cover 21; extension cylinder 22; partition plate 23; chamber 230; liquid inlet chamber 24; liquid outlet chamber 25; communication cavity 26; reaction tube 27; diversion tube 28; first port 29; second port 210; arc extension part 211; heat exchange pipeline 212; diversion device 3; driving rod 31; cover plate 301; upper eaves part 302; lower opening part 303; semi-cylindrical tube 304; through groove 305; sliding cover 306; guiding sliding part 307; connecting rod part 308; cleaning brush 309; static mixer 4; wastewater tank 5; wastewater delivery pump 51; reagent tank 6; reagent delivery pump 61; stirring kettle 7; PAM buffer tank 8; sedimentation tank 9. Detailed implementation manners

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] This embodiment discloses a wastewater phosphorus removal system. Referring to Figure 1 , Figure 2 As shown, it includes a reaction unit 2. A plurality of reaction units 2 are connected on one side, which can extend the length of the microchannel reaction device, extend the length of the microchannel, and thus extend the reaction path length. During the reaction process, it can supply reagents to mix and react fully and efficiently.

[0033] Referring to Figure 2 As shown, the reaction unit 2 includes a cylinder body 20, a plurality of reaction tubes 27 and a diversion tube 28. The cylinder body 20 is in a ring-shaped cylindrical structure, and end caps 21 are installed at both ends of the cylinder body 20. The reaction tubes 27 pass through the cylinder body 20, and both ends of the reaction tubes 27 penetrate through the two end caps 21 respectively; the diversion tube 28 also passes through the cylinder body 20, and both ends of the diversion tube 28 penetrate through the two end caps 21 respectively. The reaction tubes 27 and the diversion tube 28 are both hermetically connected to the end caps 21, and thus a relatively closed cavity can be formed inside the cylinder body 20.

[0034] Two heat exchange pipelines 212 are connected to the outside of the cylinder body 20. The heat exchange pipelines 212 communicate with the cavities between the inner wall of the cylinder body 20 and the outer walls of the reaction tubes 27 and the diversion tube 28 for the circulation of the heat exchange medium. During the working process, the heat exchange medium can be introduced into the chamber inside the cylinder body 20 through the heat exchange pipelines 212, and heat exchange can be realized with the reaction tubes 27 and the diversion tube 28. Thus, the reagents in the reaction tubes 27 and the diversion tube 28 can reach the sufficient reaction temperature, enabling the reagents in the microchannel pipeline to react efficiently. For example, the diameter of the reaction tube is 10 mm, and when multiple reaction tubes are connected, a channel with a very large length and diameter can be formed.

[0035] Each reaction tube 27 forms a plurality of narrow channels inside the cylinder body 20. When the mixed reagent enters this channel, a turbulent flow can be formed in the channel, enabling the inside of the reaction tube 2 to be fully mixed, and greatly shortening the mixing efficiency of the reagent and the wastewater. Moreover, during the reaction process, the heat exchange medium can be introduced into the cavity of the cylinder body 20, and the mixed liquid in the reaction tube 27 can be fully heat exchanged to maintain it in a high-efficiency parameter state, and thus has a high reaction efficiency.

[0036] A number of reaction units 2 are provided and are connected in sequence; an extension cylinder 22 is fixedly connected to the end face of the end cap 21 facing the outside of the cylinder body 20, and the extension cylinders 22 of two adjacent reaction units 2 cover each other, and the two extension cylinders 22 are connected and fixed by bolts and seals, so that the two reaction units 2 can be connected and fixed.

[0037] Refer to Figure 2 , Figure 3 As shown, a chamber 230 is formed between the two end caps 21. The end of the reaction tube 27 extends into the chamber 230 between the two end caps 21 and communicates with the chamber 230.

[0038] Since the cylinder body 20 has a long axial length and the reaction tube 27 also has a long axial length, multiple sections of the reaction tube 27 are connected in sequence, so that the reagent has a long flow path length, and a microchannel is formed by the inner cavity of the reaction tube 27; and through the connection of multiple reaction tubes 27, the length of the microchannel can be extended, and the mixing efficiency of the mixed reagent can be improved.

[0039] Moreover, since a chamber 230 is formed between the two reaction units 2. The multiple channels of the reaction tube 27 are arranged side by side, so that multiple independent microchannels can be formed. The chamber 230 between the two reaction units 2 enables each reaction tube 27 to communicate with the chamber 230, and the reagents in each reaction tube 27 can be mixed in the chamber 230.

[0040] A partition plate 23 is fixedly installed in the chamber 230. The partition plate 23 is arranged parallel to the end cap 21. The partition plate 23 divides the chamber 230 into two parts on the left and right, namely a liquid inlet chamber 24 near the input side and a liquid outlet chamber 25 near the output side. Refer to Figure 2 As shown, the liquid inlet chamber 24 is located on the left and the liquid outlet chamber 25 is located on the right.

[0041] There is a gap between the lower part of the partition plate 23 and the inner circumference of the extension cylinder 22, forming a certain space. A communication chamber 26 communicating the liquid inlet chamber 24 and the liquid outlet chamber 25 is formed on the lower side of the partition plate 23, so that the reagent in the reaction tube 27 can first enter the liquid inlet chamber 24, and then the reagent in the liquid inlet chamber 24 flows downward and enters the lower communication chamber 26, and then enters the liquid outlet chamber 25, and then flows backward from the liquid outlet chamber 25 and enters the subsequent reaction tubes 27 respectively. The reagents between the two reaction units 2 will be mixed in the chamber 230, so that the reagents in each reaction tube 27 can be mixed in the chamber 230, making the reagents in each microchannel more uniform, improving the mixing uniformity of various components in the reagent, and thus improving the subsequent mixing reaction efficiency.

[0042] In reaction unit 2, the end of the diversion pipe 28 extends into the chamber 230 and is in communication with the chamber 230. The diameter of the diversion pipe 28 is larger than that of the reaction pipe 27. Through the diversion pipe 28 with a larger spatial dimension, reaction precipitates can pass through. In reaction unit 2, the liquid part of the reagent can flow through each reaction pipe 27. During the reaction process, small granular flocs will gradually form in the mixed reagent, forming precipitates, which will then gradually sink in the chamber 230 and then enter the lower diversion pipe 28, and can flow backward through the diversion pipe 28. Mainly, the diversion pipe 28 can discharge particulate impurities backward. During the reaction process, most of the liquid reagent will flow backward from the reaction pipe 27 respectively, and some of the particulate precipitates mixed therein can gradually deposit downward, and then can be discharged backward through the diversion pipe 28 with a larger space, avoiding excessive precipitation of impurities in the reagent from entering the reaction pipe 27 and causing blockage of the pores of the reaction pipe 27.

[0043] The two ends of the diversion pipe 28 are respectively a first port 29 and a second port 210. The first port 29 extends into the liquid inlet chamber 24, and the second port 210 extends into the liquid outlet chamber 25. Thus, the two ends of the diversion pipe 28 can be respectively in communication with the liquid inlet chamber 24 and the liquid outlet chamber 25, and mainly communicate with the communication chamber 26 below the liquid inlet chamber 24 and the liquid outlet chamber 25. Thus, the reagents at the two ends of the diversion pipe 28 can be mixed in the communication chamber 26, so that most of the impurities in the liquid inlet chamber 24 can flow into the second port 210 of the diversion pipe 28, and the discharge of solid particulate impurities can be achieved.

[0044] Refer to Figure 3 、 Figure 4 As shown, the diversion pipes 28 are arranged side by side, and adjacent diversion pipes 28 are in contact and sealed with each other, separating the liquid outlet chamber 25 and the communication chamber 26 up and down. The diversion pipes 28 can form a side-by-side barrier, forming a separation layer.

[0045] An arc-shaped extension part 211 is fixedly connected to the end of the second port 210. The arc-shaped extension part 211 has a semi-circular structure and is located in the upper half of the second port 210. Moreover, a number of filter holes are provided in the arc-shaped extension part 211. The arc-shaped extension part 211 is connected to the lower side part of the partition plate 23 and is hermetically connected to the lower side of the partition plate 23. The arc-shaped extension parts 211 of two adjacent flow guide pipes 28 are connected in sequence to form a wave-like separation structure. The filter holes on the surface of the arc-shaped extension part 211 can allow the reagent to pass through, so that the reagent can enter the lower communication cavity 26 from the liquid inlet cavity 24, then flow upward through the communication cavity 26, enter the liquid outlet cavity 25 after passing through the filtration of the arc-shaped extension part 211, and then flow backward from the liquid outlet cavity 25 into the downstream reaction tube 27. Since the reagent entering the downstream reaction tube 27 passes through the filter holes of the arc-shaped extension part 211, large particle impurities therein can be blocked, avoiding the risk of blockage caused by the increase of particle precipitation in the reaction tube 27 during the subsequent reaction process.

[0046] During the mixing process of the wastewater and the reagent, the two react, and small particulate impurities may be deposited in the reagent. Moreover, as the reaction progresses, the particulate impurities will gradually increase to form larger particulate impurities. In addition, the aperture of the reaction tube 27 is relatively thin. During the flow process of the particulate impurities, the reaction tube 27 may be blocked, thereby affecting the normal use of the equipment, and it is necessary to wash with a specific reagent, and the washing process is relatively troublesome. In this embodiment, by using the flow guide pipe 28 with a larger aperture, the liquid that may be mixed with particulate impurities can be discharged. The larger pipe diameter can prevent blockage from occurring inside between the particulate matters, realizing relative solid-liquid separation, enabling the reagent to flow smoothly, and ensuring the normal use of the equipment.

[0047] Further, as shown in Figures 5 - 8 a flow guiding device 3 is arranged in the communication cavity 26. The flow guiding device 3 is driven by a driving rod 31 and can be adjusted along the axial direction of the flow guide pipe 28. Both ends of the driving rod 31 penetrate through the end cover 21 and are hermetically and slidably connected to the end cover 21. The driving rod 31 is connected to an external driver, so that the driving rod 31 can realize axial sliding adjustment.

[0048] Specifically, the flow guiding device 3 includes a cover plate 301. The cover plate 301 is located in the liquid inlet cavity 24 and partially extends into the communication cavity 26. Through the cover plate 301, it can abut against the outside of the first port 29 and can seal the first port 29. The cover plate 301 can move between the spaces of the two flow guide pipes 28, and the cover plate 301 can abut against the second port 210 of the flow guide pipe 28 to realize stroke limitation.

[0049] Moreover, an upper eaves portion 302 is fixedly connected to the upper side of the cover plate 301 facing the first port 29. The contour of the upper eaves portion 302 also forms a structure similar to a wavy shape, which can always form a block on the upper side of the first port 29. That is, the reagent cannot directly flow between the liquid inlet chamber 24 and the lower communication chamber 26. The reagent with particulate matter flowing through the flow guide tube 28 will also not be able to enter the upper reaction tube 27 from the communication chamber 26. The upper eaves portion 302 is hermetically connected to the outside of the first port 29, and a downward lower opening portion 303 is formed on one side of the cover plate 301 facing the first port 29.

[0050] A semi-cylindrical tube 304 is fixedly connected to one side of the cover plate 301 facing the second port 210. The semi-cylindrical tube 304 is slidably and hermetically adapted to the inner peripheral wall of the second port 210 and is located in the lower half. The semi-cylindrical tube 304 extends into the inner circumference of the second port 210 and can be slidably adjusted along the axial direction. A through groove 305 is formed on one side of the semi-cylindrical tube 304 close to the cover plate 301, and the through groove 305 can be adjusted to be opened and closed.

[0051] Specifically, the through groove 305 is located on the lower side of the semi-cylindrical tube 304. The through groove 305 is arranged along the axial direction, and a sliding cover 306 is installed on the upper side of the through groove 305. The sliding cover 306 can hermetically cover the through groove 305. The sliding cover 306 is arc-shaped and adapted to the inner peripheral wall of the semi-cylindrical tube 304 and can be slidably adjusted along the axial direction of the semi-cylindrical tube 304. By sliding adjustment, the sliding cover 306 can realize the opening and closing adjustment of the through groove 305.

[0052] Refer to Figure 6 、 Figure 8 As shown, a guiding sliding portion 307 is fixedly connected to the lower side of the sliding cover 306. The guiding sliding portion 307 is slidably adapted to the through groove 305. A connecting rod portion 308 is fixedly connected to the lower side of the guiding sliding portion 307. The connecting rod portion 308 is fixedly connected to both the guiding sliding portion 307 and the driving rod 31. Furthermore, the driving of the flow guiding device 3 can be realized through the driving rod 31.

[0053] Refer to Figure 6 As shown, when the driving rod 31 moves towards the left direction, the cover plate 301 moves towards the first port 29 direction. The cover plate 301 can hermetically cover the first port 29. At this time, the reagent enters the liquid inlet chamber 24 from the reaction tube 27, enters the second port 210 of the flow guide tube 28 from the upper open end of the semi-cylindrical tube 304, and is filtered through the filter holes of the arc-shaped extension portion 211. The relatively clean liquid will enter the liquid outlet chamber 25 and continue to flow to the subsequent reaction tube 27 to realize the flow of the liquid reagent. The possible particulate impurities will be blocked in the arc-shaped extension portion 211 and can flow backward along the flow guide tube 28 along with the water flow. The slightly larger particulate impurities that may be mixed in will not cause blockage to the pipeline.

[0054] When the driving rod 31 moves towards the right direction, the cover plate 301 moves towards the second port 210. The cover plate 301 opens the first port 29 of the diversion pipe 28, and the cover plate 301 abuts against the second port 210 of the diversion pipe 28. The liquid inlet cavity 24 and the second port 210 are blocked by the cover plate 301 and the upper eaves 302 together. At the same time, the driving rod 31 drives the sliding cover 306 to slide towards the right direction. When the sliding cover 306 slides to the limit position in the through groove 305, it can drive the cover plate 301 and the semi-cylindrical barrel 304 to move. The through groove 305 on the lower side of the semi-cylindrical barrel 304 will be opened, so that the communication cavity 26 can communicate with the inner cavities of the arc-shaped extension 211 and the second port 210 through the through groove 305. The reagent output from the previous diversion pipe 28 will enter the next diversion pipe 28, and after being filtered by the filter holes of the arc-shaped extension 211, the relatively clean liquid will enter the liquid outlet cavity 25 and continue to flow to the subsequent reaction tube 27 to realize the flow of the liquid reagent. The possible particulate impurities will be blocked in the arc-shaped extension 211 and can be discharged backward along the diversion pipe 28 along with the water flow. The slightly larger particulate impurities that may be mixed in will not cause blockage of the pipeline.

[0055] Through the coordinated action of the diversion device 3 and the driving rod 31, the on-off switching between the reaction tube 27 and the diversion pipe 28 can be realized. Furthermore, key filtration treatment can be carried out on some reagents that may contain particulate matter, the risk of blocking the pipeline aperture can be eliminated, and the smooth and stable operation of the equipment can be ensured.

[0056] Furthermore, as shown in Figure 9 the cleaning brush 309 can be installed on the guiding and sliding part 307 or the upper part of the semi-cylindrical barrel 304. The cleaning brush 309 can be adapted to the inner side of the arc-shaped extension 211. During the movement of the diversion device 3, the inner circumference of the arc-shaped extension 211 can be cleaned by the cleaning brush 309, and the attached particulate matter on the surface can be swept off and then discharged backward along the diversion pipe 28.

[0057] This embodiment also discloses a wastewater phosphorus removal system. As shown in Figure 1 it includes a static mixer 4, a wastewater tank 5, a reagent tank 6, a stirring kettle 7, a sedimentation tank 9, a PAM buffer tank 8, and the microchannel reaction device 1 as described in the above embodiment. Among them, the wastewater tank 5 and the reagent tank 6 are respectively connected to the static mixer 4 through pipelines. The wastewater tank 5 is pumped by a wastewater transfer pump 51, and the reagent tank is pumped by a corresponding reagent transfer pump 61 to realize the pumping of reagents, and two reagents can be introduced into the static mixer 4 simultaneously.

[0058] The static mixer 4 is connected to the inlet end of the microchannel reactor 1 through corresponding pipelines, and the outlet end of the microchannel reactor 1 is connected to the stirring tank 7. The mixing reagent in the static mixer 4 can be subjected to reaction treatment in the microchannel reactor 1 to achieve sufficient mixing and reaction. The stirring tank 7 is connected to a sedimentation tank 9 through a pipeline, and the PAM buffer tank 8 is connected to the stirring tank 7 through a pipeline. Only a small part of the impurities in the reagent after mixing and reaction are deposited, and then it needs to be led into the sedimentation tank 9. Then, the reagent is added from the PAM buffer tank 8 into the stirring tank 7 and then enters the sedimentation tank 9. The particulate impurities in the sewage will be ready to be flocculated to form sediments that are easy to separate, thereby enabling phosphorus removal from wastewater.

[0059] This embodiment also discloses a wastewater phosphorus removal treatment process, which uses the wastewater phosphorus removal system in the above-mentioned embodiment to treat wastewater for phosphorus removal.

[0060] First step, the high-phosphorus wastewater in the wastewater tank 5 enters from the bottom of the static mixer 4 through a delivery pump under the control of a regulating valve at a fixed flow rate. The 10% PAC reagent in the reagent tank 6 enters from the side of the static mixer 4 through a delivery pump under the control of a regulating valve at a fixed flow rate. The high-phosphorus wastewater and the reagent are properly proportioned according to the reaction ratio.

[0061] Second step, the high-phosphorus wastewater and the reagent are preliminarily mixed in the static mixer 4 and then enter the microchannel reactor 1. The high-phosphorus wastewater and the PAC reagent can be fully contacted and mixed in the microchannel reactor 1, and can have good heat exchange efficiency with the heat exchange medium. During the process of flowing through the microchannel reactor 1, fine alum flowers can be formed in a short time. The pressure in the microchannel reactor 1 remains at atmospheric pressure. The mixed reagent is output from the output end of the microchannel reactor 1 and enters the stirring tank 7. Then, the reagent continues to be mixed and reacted in the stirring tank 7. In some cases, PAM reagent can be continuously added into the stirring tank 7 and continue to be stirred and reacted in the stirring tank 7.

[0062] Third step, a lot of alum flowers in the high-phosphorus wastewater after being stirred by the stirring tank 7 slowly gather, grow thicker, and form a layer with a clear surface.

[0063] Fourth step, the mixture of wastewater and reagent, the high-phosphorus wastewater after forming thick alum flowers slowly enters the sedimentation tank 9. The alum flowers slowly sink. The remaining alum flowers with small particle size and low density slowly fall while continuously colliding with each other and growing larger and finally sink. The alum flowers precipitated at the bottom are quickly discharged, and the upper-layer water flows out slowly as clarified water.

[0064] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. A wastewater phosphorus removal system, characterized in that: The invention comprises a reaction unit (2), wherein the reaction unit (2) comprises a cylinder (20), a plurality of reaction tubes (27) and a flow guide tube (28), both ends of the cylinder (20) are provided with end covers (21), the reaction tube (27) is arranged in the cylinder (20), and both ends of the reaction tube (27) respectively pass through the two end covers (21), the flow guide tube (28) is arranged in the cylinder (20), and both ends of the flow guide tube (28) respectively pass through the two end covers (21), and both the reaction tube (27) and the flow guide tube (28) are sealedly connected to the end covers (21); the outside of the cylinder (20) is connected with a heat exchange pipeline (212), and the heat exchange pipeline (212) communicates with the inner wall of the cylinder (20) and the outer wall of the reaction tube (27) and the outer wall of the flow guide tube (28) The cavity is used for the circulation of heat exchange medium; The reaction units (2) are provided with a plurality of them, which are connected in sequence; an extension tube (22) is fixedly connected to the end surface of the end cover (21) facing the outside of the cylinder (20); the extension tubes (22) of two adjacent reaction units (2) are mutually covered to form a chamber (230) between the two end covers (21); the end of the reaction tube (27) extends into the chamber (230) between the two end covers (21) and is in communication with the chamber (230); It also includes a static mixer (4), a wastewater tank (5), a reagent tank (6), a stirring tank (7), a sedimentation tank (9), and a PAM buffer tank (8), wherein the wastewater tank (5) and the reagent tank (6) are respectively connected to the static mixer (4) through pipelines, the static mixer (4) is connected to the inlet end of a microchannel reactor (1), the microchannel reactor (1) is composed of a plurality of reaction units (2), the outlet end of the microchannel reactor (1) is connected to the stirring tank (7), the stirring tank (7) is connected to the sedimentation tank (9) through a pipeline, and the PAM buffer tank (8) is connected to the stirring tank (7) through a pipeline; When removing phosphorus from wastewater, the high-phosphorus wastewater in the wastewater tank (5) and the PAC agent in the agent tank (6) enter the static mixer (4) for preliminary mixing; and then enter the microchannel reactor (1) for full contact mixing.

2. A wastewater phosphorus removal system according to claim 1, characterized in that: A partition (23) is fixedly installed in the chamber (230), and the partition (23) is arranged parallel to the end cover (21). The partition (23) divides the chamber (230) into two parts, namely, a liquid inlet chamber (24) close to the input side and a liquid outlet chamber (25) close to the output side; there is a gap between the lower part of the partition (23) and the inner circumference of the extension tube (22), and a connecting chamber (26) connecting the liquid inlet chamber (24) and the liquid outlet chamber (25) is formed on the lower side of the partition (23).

3. A wastewater phosphorus removal system according to claim 2, characterized in that: The end of the flow guide tube (28) extends into the chamber (230) and is in communication with the chamber (230); the diameter of the flow guide tube (28) is larger than the diameter of the reaction tube (27) and is used for allowing reaction precipitates to pass through.

4. A wastewater phosphorus removal system according to claim 3, characterized in that: The two ends of the flow guide tube (28) are respectively a first port (29) and a second port (210); the first port (29) extends into the liquid inlet cavity (24), and the second port (210) extends into the liquid outlet cavity (25).

5. A wastewater phosphorus removal system according to claim 4, characterized in that: An arc-shaped extension portion (211) is fixedly connected to the end of the second port (210); the arc-shaped extension portion (211) is in a semi-annular structure and is located in the upper half of the second port (210); the arc-shaped extension portion (211) is provided with a plurality of filter holes.

6. A wastewater phosphorus removal system according to claim 5, characterized in that: A flow guide device (3) is arranged in the communicating cavity (26); the flow guide device (3) is driven by a driving rod (31) and can be adjusted along the axial direction of the flow guide tube (28); both ends of the driving rod (31) pass through the end cover (21) and are sealed and slidably connected to the end cover (21); the flow guide device (3) comprises a cover plate (301); the cover plate (301) is located in the liquid inlet cavity (24) and is used to abut against the outside of the first port (29) and can seal the first port (29); the cover plate (301) can abut against the second port (210) of the flow guide tube (28) to achieve stroke limit; The cover plate (301) is fixedly connected with an upper eave portion (302) on the upper side facing the first port (29), and the upper eave portion (302) is sealedly connected to the outside of the first port (29). A lower opening portion (303) facing downward is formed on the side of the cover plate (301) facing the first port (29); a semi-annular cylinder (304) is fixedly connected with the side of the cover plate (301) facing the second port (210), and the semi-annular cylinder (304) is slidingly sealed and adapted to the inner peripheral wall of the second port (210) and is located in the lower half; the semi-annular cylinder (304) extends into the inner periphery of the second port (210) and can be adjusted by sliding along the axial direction; a through groove (305) is formed on the side of the semi-annular cylinder (304) close to the cover plate (301), and the through groove (305) can realize opening and closing adjustment.

7. A wastewater dephosphorization process, characterized in that: The wastewater phosphorus removal system as claimed in claim 1 is used to remove phosphorus from wastewater.

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