A defluorination agent dosing device for wastewater treatment

Abstract

The present invention relates to the technical field of defluorinating agent dosing, and in particular to a defluorinating agent dosing device for wastewater treatment. When the existing device dosing the defluorinating agent, the overall mixing reaction still takes a long time and has low working efficiency. The technical scheme is: a defluorinating agent dosing device for wastewater treatment, including a cylinder, a dosing cylinder and a hollow stirring rod; the cylinder is rotatably connected to the dosing cylinder; the dosing cylinder is fixedly connected and connected to a plurality of hollow stirring rods distributed in a vertical array. The present invention intercepts the liquid defluorinating agent obliquely sprayed from the liquid outlet on the corresponding hollow stirring rod 2 through the air obliquely sprayed out of the air outlet on the dosing tube 1, slowing down the speed of the liquid defluorinating agent settling downward in the wastewater, thereby avoiding the rapid downward sedimentation of the liquid defluorinating agent, resulting in a large content of liquid defluorinating agent in the lower wastewater, and a small content of liquid defluorinating agent in the upper wastewater, uneven overall mixing reaction, and too long reaction time.

Description

Technical Field

[0001] The invention relates to the technical field of defluorination agent dosing, in particular to a defluorination agent dosing device for wastewater treatment. Background Art

[0002] At present, the methods commonly used in the treatment of fluoride-containing wastewater at home and abroad can be roughly divided into two categories: chemical precipitation method and adsorption method. The chemical precipitation method mainly involves adding chemical reagents to the fluoride-containing wastewater to form fluoride precipitates with fluoride ions in the wastewater or to adsorb fluoride ions by co-precipitation, and then separating the precipitate from the water by filtration or natural precipitation, thereby achieving the purpose of removing fluoride from the wastewater.

[0003] Based on the prior art, it is found that when the existing device adds the defluorinating agent, whether it is adding the powdered defluorinating agent to the wastewater or adding the wastewater to the powdered defluorinating agent, most of the powdered defluorinating agent will clump. Only after the powdered defluorinating agent with the clumping phenomenon is dispersed by stirring by the stirring component can the mixing reaction begin, which takes a long time overall. Therefore, the traditional method generally adopts adding liquid defluorinating agent to the wastewater. However, if the liquid defluorinating agent is added to the wastewater, the liquid defluorinating agent will react with the wastewater from top to bottom in turn. The wastewater in the upper layer reacts quickly, while the wastewater in the lower layer needs to wait until the liquid defluorinating agent settles in the wastewater in the lower layer before it can start to react. Even if it is stirred by the stirring component, the overall mixing reaction still takes a long time and the work efficiency is low. Summary of the invention

[0004] In order to overcome the disadvantages of the problems mentioned in the background, the present invention provides a defluorination agent dosing device for wastewater treatment.

[0005] The technical scheme is as follows: a defluorination agent dosing device for wastewater treatment, comprising a cylinder, a dosing cylinder, a hollow stirring rod and a rotating unit; the cylinder is rotatably connected to the dosing cylinder; the dosing cylinder is fixedly connected and connected to a plurality of hollow stirring rods distributed in a vertical array; the cylinder and the dosing cylinder are jointly equipped with a rotating unit, and the rotating unit is used to drive the dosing cylinder to rotate; it also includes a hollow stirring rod, a vent pipe, a branch pipe, a dosing pipe and a dosing unit; except for the hollow stirring rod at the bottom, each of the other hollow stirring rods is fixedly connected and connected to a plurality of hollow stirring rods distributed in a horizontal array, and the hollow stirring rods are connected to the hollow stirring rods. Rod 2 is arranged to be tilted downward; hollow stirring rod 2 is provided with a liquid outlet; a dosing tube is installed with a vent pipe; except for the top hollow stirring rod 1, each of the other hollow stirring rods 1 is fixedly connected with a branch pipe, and all the branch pipes are fixedly connected and connected with the vent pipe; each branch pipe is fixedly connected and connected with a plurality of dosing tubes 1 distributed in a transverse array, and dosing tube 1 is arranged to be tilted upward, and passes through hollow stirring rod 1 and corresponds to hollow stirring rod 2; dosing tube 1 is provided with an air outlet; a dosing unit is installed together with the cylinder body, the dosing tube and the vent pipe, and the dosing unit is used to add diluted defluorinating agent into the dosing tube.

[0006] Preferably, the dosing unit comprises a second dosing pipe, a water pipe, a water spray piece and a guide pipe; the dosing cylinder is equipped with a second dosing pipe, and the second dosing pipe is fixedly connected to the ventilation pipe; the second dosing pipe is fixedly connected to the water pipe, and the water pipe passes through the dosing cylinder and the cylinder body in turn and is connected to the outside; the water pipe is provided with a water spray piece; the lower part of the second dosing pipe is fixedly connected and connected to the guide pipe, and the guide pipe is connected to the area between the second dosing pipe and the dosing cylinder; the second dosing pipe is provided with a feed inlet; the guide pipe is provided with a one-way valve, and the output direction of the one-way valve is toward the dosing cylinder.

[0007] Preferably, the dosing unit also includes a partition plate; the dosing cylinder is fixedly connected to the partition plate; the partition plate divides the interior of the dosing cylinder into a sedimentation cavity and a temporary storage cavity, a sedimentation cavity is formed between the dosing cylinder and the partition plate, a temporary storage cavity is formed between the dosing cylinder, the dosing tube 2 and the partition plate, and the sedimentation cavity is "C"-shaped, and the guide tube is connected to the sedimentation cavity.

[0008] Preferably, the dosing unit further includes an interception plate; the dosing pipe 2 is fixedly connected with the interception plate, and the interception plate is connected to the water pipe, and the interception plate is located below the guide pipe, and the middle part of the interception plate is recessed downward.

[0009] Preferably, the guide pipe is tilted so that it is higher on the left and lower on the right.

[0010] Preferably, the dosing unit further comprises a guide block; the dosing cylinder and the partition plate are detachably connected with a plurality of symmetrically distributed guide blocks.

[0011] Preferably, the dosing unit further comprises a fan; the fan is installed on the upper part of the second dosing pipe, and the fan is located above the feed inlet.

[0012] Preferably, the second dosing pipe is provided with a truncated cone portion which is smaller at the top and larger at the bottom.

[0013] Preferably, a plurality of grooves are formed on a side of the partition plate facing the dosing cylinder.

[0014] Preferably, it also includes an air bag and a suction hose; an air bag is arranged at the lower part of the water pipe, and the expansion direction of the air bag is downward; the air bag is connected to the suction hose, and the suction hose passes through the second dosing pipe and is connected to the ventilation pipe; the intercepting plate is provided with an elastic diaphragm part.

[0015] The beneficial effects of the present invention are as follows: the present invention intercepts the liquid defluorinating agent sprayed obliquely from the liquid outlet on the corresponding hollow stirring rod 2 through the air sprayed obliquely from the air outlet on the dosing pipe 1, slowing down the speed at which the liquid defluorinating agent settles downward in the wastewater, thereby avoiding the liquid defluorinating agent from settling downward quickly, resulting in a large content of liquid defluorinating agent in the lower layer of wastewater and a small content of liquid defluorinating agent in the upper layer of wastewater, an uneven overall mixing reaction, and a long reaction time.

[0016] The present invention allows the liquid defluorinating agent to undergo preliminary precipitation in the second dosing pipe and secondary precipitation in the precipitation cavity, and separates impurities in the liquid defluorinating agent from the liquid defluorinating agent by means of multiple natural precipitations, thereby preventing the impurities from affecting the use effect of the liquid defluorinating agent.

[0017] The present invention limits the position of the liquid defluorinating agent by means of a guide block, so that the liquid defluorinating agent converges from both sides of the partition plate to the middle, and then overflows downward from the middle of the partition plate. In this way, the liquid defluorinating agent is converged, thereby increasing the flow rate of the liquid defluorinating agent, quickly replenishing the liquid defluorinating agent in the temporary storage cavity, and improving efficiency.

[0018] The present invention pushes the diaphragm portion on the interception disk downward through the lower part of the airbag, and periodically discharges the impurities deposited on the interception disk, thereby preventing more and more impurities from being deposited on the interception disk, causing the height of the impurities to gradually rise and block the guide pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure disclosed by the present invention;

[0020] Figure 2 It is a structural cross-sectional view of the cylinder disclosed in the present invention;

[0021] Figure 3 It is a schematic diagram of the combined structure of the dosing cylinder and the hollow stirring rod 1 disclosed in the present invention;

[0022] Figure 4It is a schematic diagram of the combined structure of the dosing cylinder, the second dosing pipe and the partition plate disclosed in the present invention;

[0023] Figure 5 It is a structural schematic diagram of the guide block disclosed in the present invention;

[0024] Figure 6 It is a structural schematic diagram of the dosing unit disclosed in the present invention;

[0025] Figure 7 It is a schematic diagram of a first partial structure of the dosing unit disclosed in the present invention;

[0026] Figure 8 It is a schematic diagram of a second partial structure of the dosing unit disclosed in the present invention;

[0027] Fig. 9 The present invention is a schematic diagram of the combined structure of a water pipe, an interception plate, an air bag and a ventilation hose disclosed in the present invention.

[0028] Explanation of the accompanying drawings: 1-cylinder body, 2-dosing cylinder, 3-hollow stirring rod one, 4-hollow stirring rod two, 5-ventilation pipe, 6-branch pipe, 7-dosing pipe one, 10-driving motor, 11-gear one, 12-gear two, 101-dosing pipe two, 102-water pipe, 103-water spraying part, 104-fan, 105-guide pipe, 106-intercepting disk, 107-partition plate, 201-guide block, 301-air bag, 302-suction hose, 100-sedimentation cavity, 200-temporary storage cavity, 1a-drainage outlet, 101a-cone part, 101b-feeding port, 106a-diaphragm part. DETAILED DESCRIPTION

[0029] The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.

[0030] Example 1

[0031] A defluorination agent dosing device for wastewater treatment, such as Figure 1-Figure 9 As shown, it includes a cylinder 1, a dosing cylinder 2, a hollow stirring rod 3 and a rotating unit; the cylinder 1 is rotatably connected to the dosing cylinder 2; the dosing cylinder 2 is fixedly connected and connected to a plurality of hollow stirring rods 3 distributed in a vertical array; the cylinder 1 and the dosing cylinder 2 are jointly equipped with a rotating unit;

[0032] It also includes a hollow stirring rod 2 4, a vent pipe 5, a branch pipe 6, a dosing pipe 7 and a dosing unit; except for the lowest hollow stirring rod 3, each of the other hollow stirring rods 3 is fixedly connected and connected with a number of hollow stirring rods 2 4 distributed in a transverse array, and the hollow stirring rods 2 4 are tilted downward; a liquid outlet is provided at the end of the hollow stirring rod 2 4; a vent pipe 5 is installed inside the dosing cylinder 2; except for the uppermost hollow stirring rod 3, each of the other hollow stirring rods 3 is fixedly connected with a branch pipe 6, and all the branch pipes 6 are fixedly connected and connected with the vent pipe 5; each branch pipe 6 is fixedly connected and connected with a number of dosing pipes 7 distributed in a transverse array, and the dosing pipe 7 is tilted upward and passes through the hollow stirring rod 3 to correspond to the hollow stirring rod 2 4; an air outlet is provided at the end of the dosing pipe 7; the cylinder body 1, the dosing cylinder 2 and the vent pipe 5 are jointly installed with a dosing unit.

[0033] The rotating unit includes a driving motor 10, a gear 11 and a gear 2 12; the cylinder 1 is equipped with the driving motor 10; the output shaft of the driving motor 10 is fixedly connected with the gear 11; the dosing cylinder 2 is fixedly connected with the gear 2 12, and the gear 2 12 is meshed with the gear 11.

[0034] The present invention works specifically as follows:

[0035] The ventilation pipe 5 is connected to the air pump; the drain port 1a is connected to the wastewater conveying equipment; first, wastewater is input into the cylinder 1 through the drain port 1a, and then the powdered defluorinating agent is mixed with water and the like through the adding unit to obtain a liquid defluorinating agent, and then the liquid defluorinating agent is added into the adding cylinder 2 through the adding unit, and the liquid defluorinating agent enters the hollow stirring rod 1 3 and the hollow stirring rod 2 4 from the adding cylinder 2, and then is sprayed out from the liquid outlet on the hollow stirring rod 2 4, so that at the beginning, the liquid defluorinating agent is distributed in the wastewater of each layer, and at the same time, the output shaft of the control driving motor 10 drives the gear 1 11 to rotate, so that the gear 1 11 drives the gear 2 12 and the adding cylinder 2 to rotate, so that the adding cylinder 2 drives the hollow stirring rod 1 3 and the hollow stirring rod 2 4 to rotate, so that the liquid defluorinating agent is evenly distributed in the wastewater of each layer, and the best defluorinating agent addition effect is achieved.

[0036] Since the liquid defluorinating agent will settle in the wastewater, the unreacted defluorinating agent in the upper wastewater will gradually settle into the lower wastewater, resulting in a large content of liquid defluorinating agent in the lower wastewater and a small content of liquid defluorinating agent in the upper wastewater, resulting in uneven overall mixing reaction and too long reaction time;

[0037] Therefore, while the liquid defluorinating agent is sprayed out from the liquid outlet on the hollow stirring rod 24, the air pump is controlled to input air into the dosing pipe 7 through the ventilation pipe 5 and the branch pipe 6 in turn, and then the air is sprayed out from the air outlet on the dosing pipe 7. Since the hollow stirring rod 24 is tilted downward, the dosing pipe 7 is tilted upward, and the hollow stirring rod 24 corresponds to the dosing pipe 7, the liquid defluorinating agent sprayed out from the liquid outlet on the hollow stirring rod 24 will collide with the air sprayed out from the air outlet on the dosing pipe 7. The air sprayed out from the air outlet on the dosing pipe 7 intercepts the liquid defluorinating agent sprayed out from the liquid outlet on the corresponding hollow stirring rod 24, slowing down the speed at which the liquid defluorinating agent settles downward in the wastewater, thereby avoiding the rapid downward sedimentation of the liquid defluorinating agent, resulting in a large content of liquid defluorinating agent in the lower wastewater, a small content of liquid defluorinating agent in the upper wastewater, an uneven overall mixing reaction, and a long reaction time.

[0038] After the wastewater treatment is completed, the upper layer inside the cylinder 1 is clear liquid, and the lower layer inside is sediment. At this time, the upper layer of clear liquid in the cylinder 1 is pumped out through the drain port 1a. After the clear liquid is pumped out, the operator can clean the sediment in the lower layer of the cylinder 1.

[0039] Example 2

[0040] On the basis of Example 1, Figure 4-8 As shown, the dosing unit includes a dosing pipe 101, a water pipe 102, a water spraying member 103 and a flow guide pipe 105; the dosing pipe 101 is installed inside the dosing cylinder 2, and the dosing pipe 101 is fixedly connected to the ventilation pipe 5; the dosing pipe 101 is fixedly connected to the inside of the dosing pipe 101, and the water pipe 102 passes through the dosing cylinder 2 and the cylinder body 1 in sequence and is connected to the outside; a water spraying member 103 is arranged on the upper part of the water pipe 102; the dosing pipe 101 is fixedly connected and connected to the flow guide pipe 105 at the lower part, and the flow guide pipe 105 is connected to the area between the dosing pipe 101 and the dosing cylinder 2; the dosing pipe 101 is provided with a feed inlet 101b at the upper part; the flow guide pipe 105 is provided with a one-way valve, and the output direction of the one-way valve is toward the dosing cylinder 2 to prevent liquid backflow.

[0041] The dosing unit also includes a partition plate 107; the dosing tube 2 is fixedly connected to the partition plate 107; the partition plate 107 divides the interior of the dosing tube 2 into a sedimentation cavity 100 and a temporary storage cavity 200, and the dosing tube 2 and the partition plate 107 together form a sedimentation cavity 100, and the dosing tube 2, the dosing tube 101 and the partition plate 107 together form a temporary storage cavity 200, and the sedimentation cavity 100 is "C" shaped, and the guide tube 105 is connected to the sedimentation cavity 100.

[0042] The dosing unit also includes an interception plate 106; the interception plate 106 is fixedly connected to the lower part of the dosing pipe 101, and the interception plate 106 is connected to the water pipe 102, and the interception plate 106 is located below the guide pipe 105, and the middle part of the interception plate 106 is concave downward.

[0043] The flow guide pipe 105 is tilted so that it is higher on the left and lower on the right.

[0044] The dosing unit further comprises a guide block 201 ; the dosing cylinder 2 and the partition plate 107 are detachably connected to two symmetrically distributed guide blocks 201 .

[0045] The dosing unit also includes a fan 104; the fan 104 is installed on the upper part of the dosing pipe 101, and the fan 104 is located above the feed port 101b. The airflow is input into the dosing pipe 101 through the fan 104, and the powdered defluorinating agent entering the dosing pipe 101 from the feed port 101b is broken up by the airflow and evenly diffused in the dosing pipe 101.

[0046] The upper part of the dosing pipe 101 is provided with a truncated cone portion 101a which is smaller at the top and larger at the bottom. Compared with the straight-cylindrical dosing pipe 101, the trumpet-shaped structure of the truncated cone portion 101a which is larger at the top and smaller at the bottom has a better diffusion effect, and can make the powdered defluorinating agent evenly contact the liquid sprayed by the water spraying member 103.

[0047] A plurality of grooves are formed on one side of the partition plate 107 facing the dosing tube 2 . More sediments can be intercepted by the grooves on the partition plate 107 , thereby improving the effect of removing impurities.

[0048] The present invention works specifically as follows:

[0049] The present invention intercepts the liquid defluorinating agent through the interception plate 106, so that the liquid defluorinating agent slowly rises on the interception plate 106 to the guide pipe 105, and flows to the area between the dosing pipe 101 and the dosing cylinder 2 through the guide pipe 105; in the process of the liquid defluorinating agent rising, the impurities in the liquid defluorinating agent will be deposited in the middle depression of the interception plate 106. After completing a wastewater treatment work, the interception plate 106 is disassembled and assembled to clean the impurities. In this way, the impurities in the liquid defluorinating agent are removed by natural precipitation of the liquid defluorinating agent.

[0050] Furthermore, since the guide pipe 105 is inclined with the left side higher and the right side lower, when the liquid defluorinating agent flows out through the guide pipe 105, some impurities in the liquid defluorinating agent will adhere to the inner wall of the guide pipe 105 and slide along the inclined guide pipe 105 into the dosing pipe 101 and the interception plate 106, thereby preventing the impurities from flowing out with the liquid defluorinating agent.

[0051] It should be noted that, since the partition plate 107 divides the interior of the dosing tube 2 into a sedimentation cavity 100 and a temporary storage cavity 200, the liquid defluorinating agent flowing out of the guide tube 105 will first enter the sedimentation cavity 100, and after natural sedimentation, it will flow from the sedimentation cavity 100 to the temporary storage cavity 200, and then flow from the temporary storage cavity 200 to the hollow stirring rod 1 3 and the hollow stirring rod 2 4 and spray out; and since there is a certain distance between the guide tube 105 and the bottom surface of the sedimentation cavity 100, the liquid defluorinating agent will gradually settle in the sedimentation cavity 100, and the impurities therein will settle downward, while the pure liquid defluorinating agent will slowly rise, so that the liquid defluorinating agent is initially precipitated in the dosing tube 2 101, and is secondary precipitated in the sedimentation cavity 100, and the impurities in the liquid defluorinating agent are separated from the liquid defluorinating agent by multiple natural sedimentation methods to prevent the impurities from affecting the use effect of the liquid defluorinating agent.

[0052] It should be noted that due to the presence of the partition plate 107, the liquid defluorinating agent in the sedimentation cavity 100 gradually overflows, and the liquid surface is always in a flat state. Therefore, when the liquid defluorinating agent in the sedimentation cavity 100 overflows from the edge of the partition plate 107 into the temporary storage cavity 200, it will flow slowly downward along the partition plate 107 toward the side wall of the dosing pipe 2 101, and the overall flow rate is low, and the efficiency is low;

[0053] Therefore, the present invention limits the liquid defluorinating agent through the guide block 201, so that the liquid defluorinating agent converges from both sides of the partition plate 107 to the middle, and then overflows downward from the middle of the partition plate 107. In this way, the liquid defluorinating agent is converged, thereby increasing the flow rate of the liquid defluorinating agent, quickly replenishing the liquid defluorinating agent in the temporary storage cavity 200, and improving efficiency.

[0054] Example 3

[0055] On the basis of Example 2, Figure 8-9 As shown, it also includes an air bag 301 and a suction hose 302; the air bag 301 is arranged at the lower part of the water pipe 102, and the expansion direction of the air bag 301 is downward; the air bag 301 is connected to the suction hose 302, and the suction hose 302 passes through the dosing pipe 101 and is connected to the ventilation pipe 5; the interception plate 106 is provided with an elastic diaphragm part 106a.

[0056] The present invention works specifically as follows:

[0057] After a long period of interception work, a large amount of impurities are deposited in the depression of the interception plate 106. As the interception work progresses, more and more impurities are deposited on the interception plate 106, causing the height of the impurities to gradually increase, thereby blocking the guide tube 105.

[0058] Therefore, the present invention introduces the air in the ventilation pipe 5 into the airbag 301 through the suction hose 302, so that the lower part of the airbag 301 gradually expands downward, and contacts the interception plate 106 through the impurities deposited on the interception plate 106. As the lower part of the airbag 301 continues to expand downward, the lower part of the airbag 301 will push the diaphragm part 106a on the interception plate 106 downward, so that the space above the interception plate 106 in the dosing pipe 101 is connected with the space below the interception plate 106. In this way, the impurities deposited on the interception plate 106 can flow into the space below the interception plate 106. After the impurities deposited on the interception disk 106 have been drained away, the suction hose 302 is controlled to introduce the air in the airbag 301 into the ventilation pipe 5, so that the lower part of the suction hose 302 gradually shrinks and returns to its initial state, and the diaphragm portion 106a changes from an open state to a closed state under its own elastic reset action, and continues to perform the interception and deposition functions. In this way, the impurities deposited on the interception disk 106 are periodically discharged to prevent more and more impurities from being deposited on the interception disk 106, causing the height of the impurities to gradually rise and block the guide tube 105.

[0059] The above description is only an example of the present invention and is not intended to limit the present invention. Any equivalent substitutions made within the principles of the present invention should be included in the protection scope of the present invention. The contents not elaborated in detail in the present invention belong to the existing technologies known to those skilled in the art.

Claims

1. A defluorination agent dosing device for wastewater treatment, comprising a barrel (1), a dosing barrel (2), a hollow stirring rod (3) and a rotating unit; the barrel (1) is rotatably connected to the dosing barrel (2); the dosing barrel (2) is fixedly connected to and communicates with a plurality of hollow stirring rods (3) distributed in a vertical array; the barrel (1) and the dosing barrel (2) are jointly equipped with a rotating unit, and the rotating unit is used to drive the dosing barrel (2) to rotate; characterized in that It also includes two hollow stirring rods (4), a vent pipe (5), a branch pipe (6), a dosing pipe (7) and a dosing unit; except for the bottom hollow stirring rod (3), each of the other hollow stirring rods (3) is fixedly connected and connected to a plurality of hollow stirring rods (4) distributed in a transverse array, and the hollow stirring rods (4) are arranged to be inclined downward; the hollow stirring rods (4) are provided with a liquid outlet; the dosing cylinder (2) is installed with a vent pipe (5); except for the top ... to a plurality of hollow stirring rods (4) distributed in a transverse array, and the hollow stirring rods (4) are arranged to be inclined downward; the hollow stirring rods (4) are provided with a liquid outlet; the dosing cylinder (2) is installed with a vent pipe (5); Each is fixedly connected to a branch pipe (6), and all the branch pipes (6) are fixedly connected to and communicated with the ventilation pipe (5); each branch pipe (6) is fixedly connected to and communicated with a plurality of dosing pipes (7) distributed in a transverse array, and the dosing pipe (7) is arranged to be inclined upward and passes through the hollow stirring rod (3) and corresponds to the hollow stirring rod (4); the dosing pipe (7) is provided with an air outlet; the cylinder (1), the dosing cylinder (2) and the ventilation pipe (5) are jointly equipped with a dosing unit, and the dosing unit is used to dosing the diluted defluorinating agent into the dosing cylinder (2); The rotating unit comprises a driving motor (10), a gear one (11) and a gear two (12); the cylinder (1) is mounted with the driving motor (10); the output shaft of the driving motor (10) is fixedly connected to the gear one (11); the dosing cylinder (2) is fixedly connected to the gear two (12), and the gear two (12) is meshed with the gear one (11); The dosing unit comprises a second dosing pipe (101), a water pipe (102), a water spraying member (103) and a flow guide pipe (105); the dosing tube (2) is provided with the second dosing pipe (101), and the second dosing pipe (101) is fixedly connected to the ventilation pipe (5); the second dosing pipe (101) is fixedly connected to the water pipe (102), and the water pipe (102) passes through the dosing tube (2) and the cylinder body (1) in sequence to communicate with the outside; the water pipe (102) is provided with a water spraying member (103); the lower part of the second dosing pipe (101) is fixedly connected to and communicated with the flow guide pipe (105), and the flow guide pipe (105) is connected to the area between the second dosing pipe (101) and the dosing tube (2); the second dosing pipe (101) is provided with a material inlet (101b); the flow guide pipe (105) is provided with a one-way valve, and the output direction of the one-way valve is toward the dosing tube (2); The dosing unit further comprises a partition plate (107); the dosing tube (2) is fixedly connected to the partition plate (107); the partition plate (107) divides the interior of the dosing tube (2) into a sedimentation cavity (100) and a temporary storage cavity (200); the dosing tube (2) and the partition plate (107) together form a sedimentation cavity (100); the dosing tube (2), the second dosing tube (101) and the partition plate (107) together form a temporary storage cavity (200); the sedimentation cavity (100) is in a "C" shape; and the flow guide tube (105) is connected to the sedimentation cavity (100); A plurality of grooves are formed on a side of the partition plate (107) facing the dosing cylinder (2); The dosing unit further comprises an interception plate (106); the second dosing pipe (101) is fixedly connected with the interception plate (106), and the interception plate (106) is connected to the water pipe (102), and the interception plate (106) is located below the flow guide pipe (105), and the middle part of the interception plate (106) is concave downward; The device also includes an air bag (301) and a suction hose (302); the air bag (301) is arranged at the lower part of the water pipe (102), and the expansion direction of the air bag (301) is downward; the air bag (301) is connected to the suction hose (302), and the suction hose (302) passes through the second dosing pipe (101) and is connected to the ventilation pipe (5); the interception plate (106) is provided with an elastic diaphragm portion (106a).

2. A defluorination agent dosing device for wastewater treatment according to claim 1, characterized in that: The flow guide pipe (105) is arranged to be inclined with the left side higher and the right side lower.

3. A defluorination agent dosing device for wastewater treatment according to claim 1, characterized in that: The dosing unit further comprises a guide block (201); the dosing cylinder (2) and the partition plate (107) are detachably connected to a plurality of symmetrically distributed guide blocks (201).

4. A defluorination agent dosing device for wastewater treatment according to claim 1, characterized in that: The dosing unit further comprises a fan (104); the fan (104) is installed on the upper part of the second dosing pipe (101), and the fan (104) is located above the material inlet (101b).

5. A defluorination agent dosing device for wastewater treatment according to claim 1, characterized in that: The second dosing pipe (101) is provided with a truncated cone portion (101a) which is smaller at the top and larger at the bottom.

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