A coupled defluorination device and method

Abstract

The present invention relates to the technical field of wastewater treatment, and discloses a coupled defluorination device and method, wherein a first rotating rod is rotatably arranged in a pretreatment box, a knocking mechanism and a guide plate are arranged on the first rotating rod, a first filter screen is arranged inside the pretreatment box, and the first filter screen is in active contact with the knocking mechanism; a second electrode plate is installed inside the first defluorination box, first electrodes are movably arranged on both sides of the second electrode plate, and a third filter screen is movably installed at the end of the first defluorination box. The present invention can filter the input fluorine-containing wastewater through the first filter screen in the pretreatment box to remove particulate matter in the wastewater by setting a pretreatment box, and can knock the first filter screen by setting a knocking mechanism and a guide plate to prevent the first filter screen from being blocked and affecting the subsequent filtering effect by setting a first defluorination box, and can adjust the distance between the first electrode plate and the second electrode plate by the movement of the first electrode plate by setting a first defluorination box and movably arranging a first electrode plate in the first defluorination box.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment and discloses a coupled defluorination device and method. Background Art

[0002] Coking wastewater is a toxic and difficult-to-degrade organic wastewater, and its treatment difficulty has always been at a high level in the field of sewage treatment. However, coking wastewater contains fluoride, which will scale on the reverse osmosis membrane during the treatment process, causing great harm to the reverse osmosis membrane. Therefore, it is particularly important to remove fluoride from coking wastewater.

[0003] In the prior art, the treatment methods of fluorine-containing coking wastewater mainly include chemical precipitation, adsorption, coagulation and sedimentation, electrocoagulation, ion exchange resin, reverse osmosis, liquid membrane, electrodialysis, etc. Among them, precipitation and adsorption are the most common. The basic principle of calcium salt precipitation is to add slaked lime and calcium chloride to fluorine-containing wastewater, so that fluoride ions and calcium ions in the wastewater react to produce CaF2 precipitation to remove fluoride ions. It is particularly common in the treatment of high-concentration fluorine-containing wastewater. However, the fluoride content of the effluent after treatment by calcium salt precipitation is in the range of 15-30 mg / L, which is difficult to reduce the concentration of fluoride content in the treated water to a greater extent; the basic principle of adsorption is to diffuse fluoride ions in water to the surface of solid adsorbent. The adsorption force between traditional adsorbents and fluoride ions is weak, the adsorption capacity of fluoride ions in wastewater is small, and the removal effect of fluoride ions in wastewater is poor. It is difficult to reduce the concentration of fluoride content in coking wastewater to a greater extent by precipitation or adsorption alone. Summary of the invention

[0004] In view of the defects in the prior art, the present invention provides a coupled defluorination device and method, which couples multiple defluorination methods to perform defluorination work, can effectively remove fluoride ions in coking wastewater, and has a better defluorination effect.

[0005] In order to solve the above technical problems, the present invention proposes the following technical solutions:

[0006] A coupled defluorination device comprises a pretreatment box, a first defluorination box, a second defluorination box and a detection box, a first pump body is arranged between the pretreatment box and the first defluorination box, a second pump body is arranged between the first defluorination box and the second defluorination box, the second defluorination box is connected to the detection box, and a third pump body is arranged between the second defluorination box and the detection box:

[0007] A first rotating rod is rotatably arranged in the pretreatment box, a knocking mechanism and a guide plate are arranged on the first rotating rod, a first filter screen is arranged inside the pretreatment box, and the first filter screen is in active contact with the knocking mechanism;

[0008] A second electrode plate is installed inside the first defluorination box, first electrode plates are movably installed on both sides of the second electrode plate, and a third filter screen is movably installed at the end of the first defluorination box;

[0009] A connecting sleeve is rotatably provided in the second defluorination box, a second rotating rod is movably connected in the connecting sleeve, a bearing is sleeved on the second rotating rod, a connecting column is fixedly connected to the side of the bearing, a storage tank is provided inside the second defluorination box, a partition is fixedly connected to the end of the connecting column, and the partition is movably provided in the storage tank; a second filter screen is slidably provided inside the second defluorination box, the second rotating rod is rotatably provided on the second filter screen, a floating block is installed at the bottom of the second filter screen, a third rotating rod is transmission-connected to the bottom of the second rotating rod, and a cleaning brush is provided on the third rotating rod;

[0010] A fluorine detector is inserted in the detection box.

[0011] Furthermore, a delivery port is provided on the top of the pretreatment box, and the guide plate is arranged below the delivery port. The knocking mechanism includes a connecting rod, a first spring and a knocking ball. The connecting rod is fixedly connected to the first rotating rod, and the first spring is abutted between the connecting rod and the knocking ball. The knocking ball is movably fitted with the first filter screen. The first filter screen is arranged in an arch shape as a whole. Notches are provided on both sides of the pretreatment box, and the notches are matched with the first filter screen. A slide groove is provided on the side of the pretreatment box, and a slide button is slidably arranged in the slide groove. A limit block is fixedly connected to the side of the slide button, and the limit block is movably arranged in the notch. Collection boxes are movably installed on both sides of the pretreatment box, and the collection boxes are connected to the notch.

[0012] Furthermore, a second cover plate is movably installed on the top of the first defluorination box body, a bidirectional screw is rotatably arranged on the second cover plate, a servo motor is connected to the end of the bidirectional screw, thread blocks are symmetrically arranged at both ends of the bidirectional screw, the thread blocks are slidably arranged on the second cover plate, the thread blocks are threadedly arranged on the bidirectional screw, the bottoms of the two thread blocks are respectively fixed to the first electrode plate, a groove for the sliding of the first electrode plate is opened on the second cover plate, the third filter screen is arranged in an arc shape, a third spring is abutted against the inside of the first defluorination box body, and the third spring is movably connected to the third filter screen.

[0013] Furthermore, a first cover plate is movably mounted on the second defluorination box body, a motor is mounted on the first cover plate, an output end of the motor is connected to the connecting sleeve, the storage tank is mounted on the bottom of the first cover plate, a mounting platform is fixedly mounted on the second rotating rod, the bearing is rotatably mounted on the mounting platform, the storage tank is filled with a defluorination agent, the defluorination agent is arranged above the partition, and discharge mesh ports are provided around the sides of the storage tank.

[0014] Furthermore, a stirring rod is installed on the second rotating rod, the third rotating rod is arranged below the stirring rod, a vertical plate is installed on the second filter screen, the third rotating rod is rotatably arranged on the vertical plate, a driven gear is installed on the end of the third rotating rod, and a driving gear is installed on the second rotating rod, and the driving gear is meshed and connected with the driven gear.

[0015] Furthermore, a cavity is provided in the connecting sleeve, a second spring is abutted in the cavity, an end of the second spring abuts against the second rotating rod, a groove is provided in the cavity, and protrusions are welded around the top of the second rotating rod, and the protrusions are slidably set in the groove.

[0016] Furthermore, a heating pipe is embedded in the inner wall of the second defluorination box, a first discharge port is penetrated through the bottom of the second defluorination box, a first valve is installed on the first discharge port, and a second discharge port is penetrated through the bottom of the detection box, a second valve is installed on the second discharge port.

[0017] The present invention also discloses a coupled defluorination method, which comprises the following steps:

[0018] S1, pretreatment, putting the fluorine-containing wastewater into the pretreatment box for pretreatment, after the fluorine-containing wastewater contacts the guide plate, the guide plate and the first rotating rod are driven to rotate, thereby driving the knocking mechanism to rotate, and the first filter screen is cleaned in real time, so that the first filter screen can efficiently filter the impurities in the fluorine-containing wastewater;

[0019] S2, initial defluorination, the fluorine-containing wastewater pretreated in S1 enters the first defluorination box through the first pump body, and the distance between the first electrode plate and the second electrode plate is adjusted according to the movement of the first electrode plate, so as to perform defluorination work according to demand;

[0020] S3, deep defluorination, the water source after the initial defluorination in S2 enters the second defluorination box through the second pump body, and the water source impacts the second filter screen when entering, and the second filter screen drives the second rotating rod to move, thereby pushing the partition plate, ejecting the defluorination agent in the storage tank, starting the motor to drive the stirring rod to rotate, so that the defluorination agent and the water source are fully mixed, and the heating tube is started synchronously to increase the internal temperature of the second defluorination box, thereby improving the defluorination efficiency;

[0021] S4, detection. In S3, after deep defluorination is completed, the first valve is opened to allow the water source to enter the detection box. The fluorine content of the water source entering the detection box is detected by a fluorine detector. If the fluorine content meets the standard, it is directly discharged through the second discharge port. If it does not meet the standard, the third pump is controlled to pump the water source into the second defluorination box again to continue defluorination.

[0022] S5, recovery, slide the slider to separate the limit block from the notch, so that the impurities collected by the first filter fall into the collection box, remove the second cover plate, and remove the third filter at the same time, clean the third filter and the first and second pole plates, and recover the fluorine-containing impurities on the third filter and the first and second pole plates, dry the impurities on the collection box and compress them into cakes; remove the first cover plate at the same time to collect the deposits on the second filter.

[0023] Furthermore, in S3, the defluorinating agent is an activated alumina defluorinating agent. After the recovery work in S5, the recovered material on the second filter is regenerated using a 3% aluminum sulfate solution; the specific operation is to soak the recovered material in the aluminum sulfate solution for 30 hours, then filter out the immersion liquid and wash it with clean water for 3-5 times to achieve the recovery and reuse of the defluorinating agent.

[0024] It can be seen from the above technical solution that the beneficial effects of the present invention are:

[0025] The present invention provides a pretreatment box, and can filter the input fluorine-containing wastewater through the first filter screen in the pretreatment box to remove particulate matter in the wastewater. By providing a knocking mechanism and a guide plate, the first filter screen can be knocked to prevent the first filter screen from being blocked and affecting the subsequent filtering effect.

[0026] The present invention provides a first defluorination box and movably provides a first electrode plate in the first defluorination box. The first electrode plate can be moved to adjust the distance between the first electrode plate and the second electrode plate, so that the fluorine-containing wastewater can be preliminarily defluorinated according to the needs.

[0027] The present invention can facilitate the fusion of wastewater and defluorination agent by arranging a second defluorination box body and arranging a second rotating rod and a stirring rod in the second defluorination box body, thereby facilitating the effective deep defluorination work;

[0028] The present invention provides a detection box and a fluorine detector in the detection box, so as to facilitate the detection of the water source after the fluorine is removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 For the present invention Figure 1 A magnified schematic diagram of point A;

[0032] Figure 3 For the present invention Figure 1 An enlarged schematic diagram of point B;

[0033] Figure 4 It is a schematic diagram of the connection between the second rotating rod and the storage slot in the present invention;

[0034] Figure 5 It is a cross-sectional connection diagram of the connecting sleeve and the second rotating rod in the present invention;

[0035] Figure 6 is a top cross-sectional view of the connecting sleeve in the present invention;

[0036] Figure 7 It is a schematic structural diagram of the first defluorination box in the present invention.

[0037] Reference numerals:

[0038] 1-pretreatment box, 101-feeding port, 2-first defluorination box, 3-second defluorination box, 4-detection box, 5-first pump body, 6-second pump body, 7-third pump body, 8-guide plate, 9-first rotating rod, 10-connecting rod, 11-first spring, 12-knocking ball, 13-first filter, 14-collecting box, 15-notch, 16-slide groove, 17-slide button, 18-limiting block, 19-first cover plate, 20-motor, 21-connecting sleeve, 22-storage tank, 23-heating tube, 24-second rotating rod, 25-stirring rod, 26-driving gear, 27-from Moving gear, 28-third rotating rod, 29-cleaning brush, 30-floating block, 31-second filter screen, 32-vertical plate, 33-first discharge port, 34-first valve, 35-second discharge port, 36-second valve, 37-second spring, 38-bump, 39-mounting table, 40-bearing, 41-connecting column, 42-partition, 43-discharge net port, 44-defluorination agent, 45-bidirectional screw, 46-servo motor, 47-threaded block, 48-first pole plate, 49-second pole plate, 50-third filter screen, 51-third spring, 52-fluorine detector, 53-second cover plate. DETAILED DESCRIPTION

[0039] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0040] Reference Figure 1-7A coupled defluorination device comprises a pretreatment box 1, a first defluorination box 2, a second defluorination box 3 and a detection box 4, a first pump 5 is arranged between the pretreatment box 1 and the first defluorination box 2, a second pump 6 is arranged between the first defluorination box 2 and the second defluorination box 3, the second defluorination box 3 is connected to the detection box 4, and a third pump 7 is arranged between the second defluorination box 3 and the detection box 4:

[0041] A first rotating rod 9 is rotatably arranged in the pretreatment box 1, a knocking mechanism and a guide plate 8 are arranged on the first rotating rod 9, a first filter screen 13 is arranged inside the pretreatment box 1, and the first filter screen 13 is in active contact with the knocking mechanism;

[0042] A second electrode plate 49 is installed inside the first defluorination box 2, and first electrode plates 48 are movably installed on both sides of the second electrode plate 49. A third filter screen 50 is movably installed at the end of the first defluorination box 2.

[0043] A connecting sleeve 21 is rotatably provided in the second defluorination box 3, a second rotating rod 24 is movably connected in the connecting sleeve 21, a bearing 40 is sleeved on the second rotating rod 24, a connecting column 41 is fixedly connected to the side of the bearing 40, a storage tank 22 is provided inside the second defluorination box 3, a partition 42 is fixedly connected to the end of the connecting column 41, and the partition 42 is movably provided in the storage tank 22; a second filter screen 31 is slidably provided inside the second defluorination box 3, the second rotating rod 24 is rotatably provided on the second filter screen 31, a floating block 30 is installed at the bottom of the second filter screen 31, a third rotating rod 28 is transmission-connected to the bottom of the second rotating rod 24, and a cleaning brush 29 is provided on the third rotating rod 28;

[0044] A fluorine detector 52 is inserted into the detection box 4 .

[0045] In actual use, by setting up a pretreatment box 1, the fluorine-containing wastewater can be filtered through the first filter 13 in the pretreatment box 1 to remove particulate matter in the wastewater. By setting up a knocking mechanism and a guide plate 8, the first filter 13 can be knocked to prevent the first filter 13 from being blocked and affecting the subsequent filtering effect; by setting up a first defluorination box 2 and movably setting a first electrode 48 in the first defluorination box 2, the distance between the first electrode 48 and the second electrode 49 can be adjusted through the movement of the first electrode 48, so that the fluorine-containing wastewater can be preliminarily defluorinated according to needs; by setting up a second defluorination box 3 and arranging a second rotating rod 24 and a stirring rod 25 in the second defluorination box 3, the fusion of wastewater and defluorination agent can be facilitated, so as to facilitate effective deep defluorination; by setting up a detection box 4 and arranging a fluorine detector 52 in the detection box 4, it is convenient to detect the water source after defluorination.

[0046] See also Figure 1 and Figure 2In this embodiment, a delivery port 101 is provided at the top of the pretreatment box 1, and the guide plate 8 is arranged below the delivery port 101. The knocking mechanism includes a connecting rod 10, a first spring 11 and a knocking ball 12. The connecting rod 10 is fixedly connected to the first rotating rod 9, and the first spring 11 is abutted between the connecting rod 10 and the knocking ball 12. The knocking ball 12 is movably fitted with the first filter screen 13. The first filter screen 13 is arranged in an arch shape as a whole. Notches 15 are provided on both sides of the pretreatment box 1. The notch 15 is matched with the first filter screen 13. A slide groove 16 is provided on the side of the pretreatment box 1. A slide button 17 is slidably arranged in the slide groove 16. A limit block 18 is fixedly connected to the side of the slide button 17. The limit block 18 is movably arranged in the notch 15. Collection boxes 14 are movably installed on both sides of the pretreatment box 1, and the collection box 14 is connected to the notch 15.

[0047] Specifically, the fluorine-containing wastewater to be treated can be put into the pretreatment box 1 through the delivery port 101. After the wastewater contacts the guide plate 8, it will drive the guide plate 8 and the first rotating rod 9 to rotate, thereby driving the connecting rod 10, the first spring 11 and the knocking ball 12 to rotate. The knocking ball 12 continuously knocks the first filter screen 13 to prevent the first filter screen 13 from being blocked; after the filtration is completed, the sliding button 17 is slid so that the sliding button 17 drives the limit block 18 to move, and the limit block 18 slides out of the notch 15. By setting the first filter screen 13 as a whole in an arch shape, the impurities filtered on the first filter screen 13 slide downward and slide into the collection box 14 for collection.

[0048] See also Figure 1 and Figure 7 In this embodiment, a second cover plate 53 is movably installed on the top of the first defluorination box 2, a bidirectional screw 45 is rotatably arranged on the second cover plate 53, a servo motor 46 is connected to the end of the bidirectional screw 45, thread blocks 47 are symmetrically arranged at both ends of the bidirectional screw 45, the thread blocks 47 are slidably arranged on the second cover plate 53, the thread blocks 47 are threadedly arranged on the bidirectional screw 45, the bottoms of the two thread blocks 47 are respectively fixed to the first electrode plate 48, a groove for sliding the first electrode plate 48 is opened on the second cover plate 53, the third filter screen 50 is arranged in an arc shape, a third spring 51 is abutted against the interior of the first defluorination box 2, and the third spring 51 is movably connected to the third filter screen 50;

[0049] Specifically, the bidirectional screw 45 can be driven to rotate by starting the servo motor 46, so that the adjacent distance between the first pole plate 48 and the second pole plate 49 can be adjusted according to the needs, so as to facilitate the defluorination work to be better performed according to the needs; after the defluorination work is completed, the second cover plate 53 is opened, the third filter screen 50 is disassembled, and the third filter screen 50 is cleaned; when the third filter screen 50 is filtering, the flow of water will impact the third filter screen 50, and the third filter screen 50 can be moved under the left and right of the third spring 51 to prevent the third filter screen 50 from being blocked, wherein a hook can be provided on the third spring 51, and the third spring 51 is movably connected to the third filter screen 50 through the hook;

[0050] The first electrode plate 48 is an anode plate. During the electrolysis process, an oxidation reaction may occur on the anode, and the fluoride ions are converted into high-valent fluorides through oxidation. These high-valent fluorides often have low solubility and are easy to precipitate from the wastewater.

[0051] The second electrode plate 49 is a cathode plate, and the main function of the cathode plate is to act as an electron acceptor and participate in the equilibrium process of the electrochemical reaction, or in some cases, through the design of specific electrolysis conditions, to enrich fluoride ions in the cathode chamber and further process them.

[0052] See also Figure 1 , Figure 3 , Figure 4 , Figure 5 as well as Figure 6 In this embodiment, a first cover plate 19 is movably mounted on the second defluorination box 3, a motor 20 is mounted on the first cover plate 19, an output end of the motor 20 is connected to a connecting sleeve 21, the storage tank 22 is mounted on the bottom of the first cover plate 19, a mounting platform 39 is fixedly mounted on the second rotating rod 24, the bearing 40 is rotatably mounted on the mounting platform 39, the storage tank 22 is filled with a defluorination agent 44, the defluorination agent 44 is arranged above the partition 42, and a discharge net port 43 is arranged around the side of the storage tank 22; a stirring rod 25 is mounted on the second rotating rod 24, and a third rotating rod 2 8 is arranged below the stirring rod 25, a vertical plate 32 is installed on the second filter screen 31, a third rotating rod 28 is rotatably arranged on the vertical plate 32, a driven gear 27 is installed on the end of the third rotating rod 28, a driving gear 26 is installed on the second rotating rod 24, and the driving gear 26 is meshed and connected with the driven gear 27; a cavity is arranged in the connecting sleeve 21, a second spring 37 is abutted in the cavity, an end of the second spring 37 abuts against the second rotating rod 24, a groove body is opened in the cavity, and a convex block 38 is welded around the top of the second rotating rod 24, and the convex block 38 is slidably arranged in the groove body;

[0053] Specifically, the motor 20 can be started to drive the connecting sleeve 21 and the second rotating rod 24 to rotate, thereby driving the stirring rod 25 to rotate, so as to better mix the fluorine-containing wastewater with the defluorinating agent. When the second rotating rod 24 rotates, the driving gear 26 rotates accordingly, thereby driving the driven gear 27 and the third rotating rod 28 to rotate, thereby driving the cleaning brush 29 to rotate, and the second filter screen 31 is cleaned to prevent the second filter screen 31 from being blocked and thus reducing the water filtering effect; through the arrangement of the groove body and the protrusion 38, the rotation of the connecting sleeve 21 can drive the second rotating rod 24 to rotate, and when the second filter screen 31 moves up and down, the second rotating rod 24 can move up and down on the connecting sleeve 21, thereby pushing the partition 42 to move.

[0054] Among them, after the fluorine-containing wastewater input into the second defluorination box 3 reaches a certain amount, the second spring 37 is compressed to the extreme, the top of the second rotating rod 24 is close to the inner top of the connecting sleeve 21, and the defluorinating agent 44 in the storage tank 22 is also completely pushed out by the partition 42 to mix with the fluorine-containing wastewater. Since the second rotating rod 24 is close to the connecting sleeve 21, the floating block 30 will not be suspended on the surface of the fluorine-containing wastewater, but immersed in the fluorine-containing wastewater, so that the stirring rod can be immersed in the fluorine-containing wastewater and rotate continuously to effectively mix the defluorinating agent and the fluorine-containing wastewater.

[0055] The second filter screen 31 is a precision water-permeable screen, which can prevent the defluorinating agent and substances obtained by the reaction between the defluorinating agent and fluorine from flowing out of the second filter screen 31 .

[0056] See also Figure 1 and Figure 3 In this embodiment, a heating pipe 23 is embedded in the inner wall of the second defluorination box 3, a first discharge port 33 is provided through the bottom of the second defluorination box 3, a first valve 34 is installed on the first discharge port 33, and a second discharge port 35 is provided through the bottom of the detection box 4, and a second valve 36 is installed on the second discharge port 35;

[0057] Specifically, by setting the heating tube 23, the interior of the second defluorination box 3 can be heated, so that the defluorination work can be better performed. By setting the first discharge port 33 and the second discharge port 35, the water source can be discharged.

[0058] The present invention also discloses a coupled defluorination method, which comprises the following steps:

[0059] S1, pretreatment, putting the fluorine-containing wastewater into the pretreatment box 1 for pretreatment, after the fluorine-containing wastewater contacts the guide plate 8, the guide plate 8 and the first rotating rod 9 are driven to rotate, thereby driving the knocking mechanism to rotate, and the first filter screen 13 is cleaned in real time, so that the first filter screen 13 can efficiently filter the impurities in the fluorine-containing wastewater;

[0060] S2, initial defluorination, the fluorine-containing wastewater pretreated in S1 enters the first defluorination box 2 through the first pump body, and the distance between the first electrode plate 48 and the second electrode plate 49 is adjusted according to the movement of the first electrode plate 48, so as to perform defluorination work according to demand;

[0061] S3, deep defluorination, the water source after the initial defluorination in S2 enters the second defluorination box 3 through the second pump body 6, and the water source impacts the second filter screen 31 when entering, and the second filter screen 31 drives the second rotating rod 24 to move, thereby pushing the partition 42, and ejecting the defluorination agent 44 in the storage tank 22, and starting the motor 20 to drive the stirring rod 25 to rotate, so that the defluorination agent 44 and the water source are fully mixed, and the heating tube 23 is started synchronously to increase the internal temperature of the second defluorination box 3 and improve the defluorination efficiency;

[0062] S4, detection. In S3, after deep defluorination is completed, the first valve 34 is opened to allow the water source to enter the detection box 4. The fluorine content of the water source entering the detection box 4 is detected by the fluorine detector 52. If the fluorine content meets the standard, it is directly discharged through the second discharge port 35. If it does not meet the standard, the third pump body 7 is controlled to pump the water source into the second defluorination box 3 again to continue defluorination;

[0063] S5, recovery, slide the slider 17 to separate the limit block 18 from the notch 15, so that the impurities collected by the first filter 13 fall into the collection box 14, remove the second cover plate 53, and at the same time remove the third filter 50, clean the third filter 50 and the first and second pole plates 48 and 49, and recover the fluorine-containing impurities on the third filter 50 and the first and second pole plates 48 and 49, dry the impurities on the collection box 14 and compress them into cakes; at the same time remove the first cover plate 19 to collect the deposits on the second filter 31.

[0064] By drying and compressing the impurities on the collecting box 14 into cakes, the compressed cakes collected in the collecting box 14 can be incinerated to ensure the recycling of resources.

[0065] In this embodiment, in S3, the defluorinating agent 44 is an activated alumina defluorinating agent. After the recovery work of S5, the recyclables on the second filter 31 are regenerated using a 3% aluminum sulfate solution; the specific operation is to soak the recyclables in the aluminum sulfate solution for 30 hours, then filter out the immersion liquid and wash with clean water for 3-5 times to achieve the recovery and reuse of the defluorinating agent; thereby, the defluorinating agent can be recovered and reused to prevent the waste of the defluorinating agent.

[0066] During the defluorinating agent recovery process, the pH value of the recovered material on the second filter screen 31 may also be adjusted. By adjusting the pH value to about 7.5, the defluorinating agent may be regenerated.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A coupled defluorination device, comprising a pretreatment box (1), a first defluorination box (2), a second defluorination box (3) and a detection box (4), wherein a first pump (5) is arranged between the pretreatment box (1) and the first defluorination box (2), a second pump (6) is arranged between the first defluorination box (2) and the second defluorination box (3), the second defluorination box (3) is connected to the detection box (4), and a third pump (7) is arranged between the second defluorination box (3) and the detection box (4), characterized in that: A first rotating rod (9) is rotatably arranged in the pretreatment box (1), a knocking mechanism and a guide plate (8) are arranged on the first rotating rod (9), a first filter screen (13) is arranged inside the pretreatment box (1), and the first filter screen (13) is in active contact with the knocking mechanism; A second electrode plate (49) is installed inside the first defluorination box (2), first electrode plates (48) are movably installed on both sides of the second electrode plate (49), and a third filter screen (50) is movably installed at the end of the first defluorination box (2); A connecting sleeve (21) is rotatably arranged in the second defluorination housing (3), a second rotating rod (24) is movably connected to the connecting sleeve (21), a bearing (40) is sleeved on the second rotating rod (24), a connecting column (41) is fixedly connected to the side of the bearing (40), a storage tank (22) is arranged inside the second defluorination housing (3), a partition (42) is fixedly connected to the end of the connecting column (41), and the partition (42) is movably arranged in the storage tank (22); a second filter screen (31) is slidably arranged inside the second defluorination housing (3), the second rotating rod (24) is rotatably arranged on the second filter screen (31), a floating block (30) is installed at the bottom of the second filter screen (31), a third rotating rod (28) is rotatably connected to the bottom of the second rotating rod (24), and a cleaning brush (29) is arranged on the third rotating rod (28); A fluorine detector (52) is inserted into the detection box (4).

2. A coupled defluorination device according to claim 1, characterized in that: The top of the pretreatment box (1) is provided with a delivery port (101), the guide plate (8) is arranged below the delivery port (101), the knocking mechanism comprises a connecting rod (10), a first spring (11) and a knocking ball (12), the connecting rod (10) is fixedly connected to the first rotating rod (9), the first spring (11) is abutted between the connecting rod (10) and the knocking ball (12), the knocking ball (12) is movably fitted with the first filter screen (13), and the first filter screen (13) is arranged in an arched shape as a whole. Notches (15) are provided on both sides of the pretreatment box (1), the notches (15) being arranged in cooperation with the first filter screen (13); a slide groove (16) is provided on the side of the pretreatment box (1), a slide button (17) is slidably arranged in the slide groove (16), a limit block (18) is fixedly connected to the side of the slide button (17), the limit block (18) is movably arranged in the notch (15), and a collection box (14) is movably installed on both sides of the pretreatment box (1), and the collection box (14) is connected to the notch (15).

3. A coupled defluorination device according to claim 2, characterized in that: A second cover plate (53) is movably mounted on the top of the first defluorination housing (2); a bidirectional screw (45) is rotatably mounted on the second cover plate (53); the ends of the bidirectional screw (45) are connected to a servo motor (46); threaded blocks (47) are symmetrically mounted at both ends of the bidirectional screw (45); the threaded blocks (47) are slidably mounted on the second cover plate (53); the threaded blocks (47) are threadedly mounted on the bidirectional screw (45); the bottoms of the two threaded blocks (47) are respectively fixed to the first electrode plate (48); a groove for the first electrode plate (48) to slide is formed on the second cover plate (53); the third filter screen (50) is arranged in an arc shape; a third spring (51) is abutted against the interior of the first defluorination housing (2); and the third spring (51) is movably connected to the third filter screen (50).

4. A coupled defluorination device according to claim 3, characterized in that: A first cover plate (19) is movably mounted on the second defluorination box (3), a motor (20) is mounted on the first cover plate (19), an output end of the motor (20) is connected to a connecting sleeve (21), the storage tank (22) is mounted on the bottom of the first cover plate (19), a mounting platform (39) is fixedly mounted on the second rotating rod (24), the bearing (40) is rotatably mounted on the mounting platform (39), the storage tank (22) is filled with a defluorination agent (44), the defluorination agent (44) is arranged above the partition plate (42), and discharge net ports (43) are arranged around the sides of the storage tank (22).

5. A coupled defluorination device according to claim 4, characterized in that: The second rotating rod (24) is mounted with a stirring rod (25), the third rotating rod (28) is arranged below the stirring rod (25), the second filter screen (31) is mounted with a vertical plate (32), the third rotating rod (28) is rotatably mounted on the vertical plate (32), a driven gear (27) is mounted on the end of the third rotating rod (28), the second rotating rod (24) is mounted with a driving gear (26), and the driving gear (26) is meshingly connected with the driven gear (27).

6. A coupled defluorination device according to claim 5, characterized in that: The connecting sleeve (21) is provided with a cavity, a second spring (37) is abutted in the cavity, an end of the second spring (37) abuts against the second rotating rod (24), a groove body is provided in the cavity, and a protrusion (38) is welded around the top of the second rotating rod (24), and the protrusion (38) is slidably arranged in the groove body.

7. A coupled defluorination device according to claim 6, characterized in that: A heating pipe (23) is embedded in the inner wall of the second defluorination box (3); a first discharge port (33) is provided through the bottom of the second defluorination box (3); a first valve (34) is installed on the first discharge port (33); a second discharge port (35) is provided through the bottom of the detection box (4); a second valve (36) is installed on the second discharge port (35).

8. A coupled defluorination method, using the coupled defluorination device according to claim 7, characterized in that: The defluorination method comprises the following steps: S1, pretreatment, putting the fluorine-containing wastewater into the pretreatment box (1) for pretreatment, after the fluorine-containing wastewater contacts the guide plate (8), the guide plate (8) and the first rotating rod (9) are driven to rotate, thereby driving the knocking mechanism to rotate, and cleaning the first filter screen (13) in real time, so that the first filter screen (13) can efficiently filter impurities in the fluorine-containing wastewater; S2, initial defluorination, the fluorine-containing wastewater pretreated in S1 enters the first defluorination box (2) through the first pump body, and the distance between the first electrode plate (48) and the second electrode plate (49) is adjusted according to the movement of the first electrode plate (48), so as to perform defluorination work according to demand; S3, deep defluorination, the water source after the initial defluorination in S2 enters the second defluorination box (3) through the second pump body (6), and the water source impacts the second filter screen (31) when entering, and the second filter screen (31) drives the second rotating rod (24) to move, thereby pushing the partition (42) to push out the defluorination agent (44) in the storage tank (22), and starting the motor (20) to drive the stirring rod (25) to rotate, so that the defluorination agent (44) and the water source are fully mixed, and the heating tube (23) is started synchronously to increase the internal temperature of the second defluorination box (3) and improve the defluorination efficiency; S4, detection. In S3, after deep defluorination is completed, the first valve (34) is opened to allow the water source to enter the detection box (4). The fluorine content of the water source entering the detection box (4) is detected by a fluorine detector (52). If the fluorine content meets the standard, it is directly discharged through the second discharge port (35). If it does not meet the standard, the third pump body (7) is controlled to pump the water source into the second defluorination box (3) again to continue defluorination. S5, recovery, sliding the slider (17) to separate the limit block (18) from the notch (15), so that the impurities collected by the first filter (13) fall into the collection box (14), removing the second cover plate (53), and at the same time removing the third filter (50), cleaning the third filter (50) and the first electrode plate (48), the second electrode plate (49), and recovering the fluorine-containing impurities on the third filter (50) and the first electrode plate (48), the second electrode plate (49), and drying and compressing the impurities on the collection box (14) into cakes; at the same time removing the first cover plate (19), thereby collecting the deposits on the second filter (31).

9. A coupled defluorination method according to claim 8, characterized in that: In S3, the defluorinating agent (44) is an activated alumina defluorinating agent. After the recovery work in S5, the recovered material on the second filter (31) is regenerated using a 3% aluminum sulfate solution. The specific operation is to soak the recovered material in the aluminum sulfate solution for 30 hours, then filter out the soaking liquid and wash it with clean water for 3-5 times, so as to realize the recovery and reuse of the defluorinating agent.

Images