Fluoride polluted water treatment equipment and fluoride removal process thereof

Abstract

The invention provides fluoride polluted water treatment equipment and a fluoride removal process thereof, and relates to the technical field of water pollution treatment, the fluoride polluted water treatment equipment comprises a treatment box, a top plate, a bracket, a driving mechanism and a discharging mechanism; the top plate is installed at the top of the treatment box, a positioning plate is fixedly arranged in the middle of the top of the top plate, a positioning frame is installed at the top of the top plate and located outside the positioning plate, a discharging pipe is fixedly arranged in the positioning frame, and the bottom end of the discharging pipe is rotationally connected with a rotating pipe. According to the scheme, through combination of shunting and buffering, the two inclined plates firstly disperse concentrated inlet water into multiple water flows, the water flow impact speed is reduced through the inclined angles of the inclined plates, direct erosion of an adsorbent layer is avoided, meanwhile, the two inclined plates synchronously move to further disperse the water flows into a film shape or a uniform drop shape, and the whole cross section of the adsorption bed is covered; the uniform water distribution enables the sewage to flow through the adsorbent layer in a plug flow state instead of disordered fluid channeling, the retention time of the water flow in the adsorption bed is changed to be consistent, and the average retention time is prolonged.

Description

Technical Field

[0001] This invention relates to the field of water pollution control, and in particular to a fluoride-contaminated water treatment device and its defluorination process. Background Technology

[0002] Fluoride pollution is a significant threat to global drinking water safety, especially in areas where groundwater is rich in fluoride. Long-term consumption of water with excessive fluoride concentrations can lead to dental fluorosis, osteoporosis, and even damage to the nervous system.

[0003] Existing defluoridation technologies generally face a trade-off between efficiency, cost, and sustainability in practical applications. Adsorption is considered the most promising solution due to its ease of operation, but mainstream adsorption materials such as activated alumina, while possessing high adsorption capacity, require strict control of the water body to an acidic environment, limiting their application in remote areas.

[0004] In existing technologies, during the wastewater adsorption and defluorination process, traditional influent methods can easily lead to wastewater concentrating and impacting local areas of the adsorption bed, forming short-flow channels. Wastewater may flow out before it has fully contacted the adsorbent, or the adsorbent layer may be eroded into grooves, resulting in a large amount of adsorbent not being utilized and low adsorption efficiency.

[0005] Therefore, it is necessary to provide a fluoride-contaminated water treatment device and its defluorination process to solve the above-mentioned technical problems. Summary of the Invention

[0006] This invention provides a fluoride-contaminated water treatment device and its defluorination process, which solves the problem in related technologies where traditional water inlet methods easily lead to concentrated wastewater impacting local areas of the adsorption bed, thus affecting the adsorption effect.

[0007] To solve the above-mentioned technical problems, the present invention provides a fluoride-contaminated water treatment device, including a treatment tank, a top plate, a support, a drive mechanism, and a feeding mechanism;

[0008] The top plate is installed on the top of the processing box. A positioning plate is fixed in the middle of the top of the top plate. A positioning frame is installed on the top of the top plate and outside the positioning plate. A feeding pipe is fixed inside the positioning frame. A rotating pipe is rotatably connected to the bottom end of the feeding pipe.

[0009] The drive mechanism includes a motor mounted on the upper surface of the bracket, a drive pulley connected to the keyway of the motor output shaft, a ratchet fixed to the outer wall of the rotating tube, a ratchet pulley meshing with the outer wall of the ratchet pulley, a first belt sleeved on the outer walls of the ratchet pulley and the drive pulley, and a positioning sleeve fixed to the bottom end of the ratchet pulley.

[0010] The feeding mechanism includes an installation chamber and a truss fixed to the bottom of the top plate. Two inclined plates are rotatably installed inside the truss via torsion springs. Inner plates are fixed to the inner walls of both inclined plates. A drive rod is connected to the drive pulley shaft via a keyway. A half gear is connected to the bottom of the drive rod via a keyway. A rack reciprocating ring is meshed with the outer wall of the half gear. A push rod is fixed to the side wall of the rack reciprocating ring. A push plate is fixed to the outer end of the push rod.

[0011] An adsorption bed is installed on the inner wall of the processing box and below the feeding mechanism. A discharge pipe is installed on the side wall of the processing box, and a panel is installed on the outer wall of the processing box.

[0012] Preferably, the outer wall of the positioning sleeve is rotatably connected to the inner wall of the positioning plate, and the outer wall of the rotating tube is rotatably connected to the inner wall of the top plate.

[0013] Preferably, the outer wall of the drive rod is rotatably connected to the top plate and the mounting chamber, and the rack reciprocating ring and the push rod are slidably connected about the horizontal direction of the mounting chamber.

[0014] Preferably, the two inner plates are in contact with the outer wall of the push plate, and the cross-section of the push plate is an equilateral triangle.

[0015] Preferably, a mounting sleeve is fixedly provided at the bottom of the top plate and outside the rotating tube, an internal gear ring is fixedly provided on the inner wall of the mounting sleeve, a gear sleeve is fixedly provided on the outer wall of the rotating tube and inside the mounting sleeve, a driven gear is meshed with the outer wall of the gear sleeve, a turntable is rotatably connected to the bottom of the driven gear, and a cleaning plate is fixedly provided at the bottom of the turntable.

[0016] Preferably, the driven gear and the internal gear ring mesh with each other, the outer wall of the turntable is rotatably connected to the mounting sleeve through a "T" ring, and the outer wall of the cleaning plate is in contact with the inner wall of the rotating tube.

[0017] Preferably, it also includes auxiliary mechanisms;

[0018] The auxiliary mechanism includes a second pulley rotatably connected to the upper surface of the top plate, a first pulley fixed to the outer wall of the rotating tube, a second belt sleeved on the outer walls of the first and second pulleys, a cam connected to the top of the second pulley via a keyway, a mounting seat installed on the upper surface of the top plate and on one side of the second pulley, a mounting frame installed on the top of the mounting seat, a rubber bladder installed inside the mounting frame, an inlet pipe and an outlet pipe respectively installed at both ends of the rubber bladder, and a spring plate slidably connected to the outside of the mounting frame.

[0019] Preferably, the cam and the spring plate are in the same horizontal direction, the outer wall of the spring plate is in contact with the outer wall of the rubber bladder, and the outlet end of the liquid outlet pipe extends into the interior of the treatment tank.

[0020] A process for defluoridating fluoride-contaminated water includes the following steps:

[0021] S1: Mix calcium salt, phosphate and a small amount of aluminum salt in a certain proportion, add dispersant and stir to form a uniform solution;

[0022] S2: The mixed solution is transferred to a high-pressure reactor and reacted at high temperature for a certain time to generate nanostructured materials;

[0023] S3: After the reaction is complete, the product is collected by centrifugation, washed alternately with deionized water and ethanol, and dried to obtain powder;

[0024] S4: Calcine the dried powder at a certain temperature to improve the crystallinity and stability of the material;

[0025] S5: Fill the adsorption column with modified material particles and control the packing density and bed height;

[0026] S6: Pre-rinse the adsorption column with dilute acid solution to activate the surface adsorption sites;

[0027] S7: Fluorine-containing water is passed through the adsorption column at a certain flow rate, and the fluoride concentration in the water is detected in real time up to the breakthrough point. Fluorine-containing wastewater needs to enter the adsorption bed in the treatment tank for fluoride removal adsorption during the adsorption process.

[0028] S8: After breakthrough, backwash the adsorption column with a low-concentration alkaline solution to elute the adsorbed fluoride ions;

[0029] S9: Soak the adsorption column in a dilute acid solution to restore the surface activity of the material, and then rinse with water until neutral.

[0030] S10: Add calcium salt to the elution waste liquid to precipitate fluoride ions, filter and recover the precipitate, and discharge it after treatment to meet the standards.

[0031] Compared with related technologies, the fluoride-contaminated water treatment equipment and its defluorination process provided by the present invention have the following beneficial effects:

[0032] By combining diversion and buffering, the two inclined plates first disperse the concentrated influent into multiple streams. The inclined angle of the plates reduces the impact velocity of the water flow and avoids direct erosion of the adsorbent layer. At the same time, the synchronous movement of the two inclined plates further disperses the water flow into a thin film or uniform droplets, covering the entire cross-section of the adsorption bed.

[0033] Uniform water distribution allows wastewater to flow through the adsorbent layer in a plug flow state, rather than in a disorderly flow. The residence time of the water in the adsorption bed becomes uniform and the average residence time is extended. The dispersion and buffering effect of the inclined plate allows the wastewater to contact the adsorbent surface in a thin layer or droplets, reducing the resistance to liquid film mass transfer and accelerating the adsorption reaction.

[0034] The shift from passive water distribution to active water distribution control solves several problems in the adsorption and defluorination system, such as uneven water distribution and insufficient contact. Furthermore, it eliminates the need for additional pretreatment equipment and water distribution devices, simplifying the process structure. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0036] Figure 1 The optimal structural schematic diagram provided for this invention;

[0037] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the processing box.

[0038] Figure 3 for Figure 2 The diagram shows the structure viewed from below.

[0039] Figure 4 A schematic diagram of the drive mechanism structure provided by the present invention;

[0040] Figure 5 This is a cross-sectional view of the positioning sleeve, positioning plate, and ratchet pulley shown in the present invention.

[0041] Figure 6 This is a schematic diagram of the initial working state of the feeding mechanism provided by the present invention;

[0042] Figure 7 for Figure 6 The enlarged structural diagram at point A is shown below;

[0043] Figure 8 for Figure 6 The diagram shows the reciprocating motion working state of the feeding mechanism;

[0044] Figure 9 A plan view of the rotary tube feeding trajectory provided by the present invention;

[0045] Figure 10 This is a schematic cross-sectional view of the mounting sleeve and rotating tube shown in this invention;

[0046] Figure 11 for Figure 10 The diagram shows the structure viewed from below.

[0047] Figure 12 This is a schematic diagram of the working state of the auxiliary mechanism shown in this invention;

[0048] Figure 13 A schematic diagram of the fluoride removal process for fluoride-contaminated water provided by the present invention.

[0049] Explanation of icon numbers:

[0050] 1. Processing box;

[0051] 2. Top slab;

[0052] 3. Drive mechanism; 31. Motor; 32. Drive pulley; 33. Ratchet; 34. Ratchet pulley; 35. First belt; 36. Positioning sleeve.

[0053] 4. Positioning plate;

[0054] 5. Positioning frame; 6. Feed tube; 7. Rotary tube;

[0055] 8. Feeding mechanism; 81. Installation bin; 82. Truss; 83. Inclined plate; 84. Inner plate; 85. Drive rod; 86. Half gear; 87. Rack and pinion ring; 88. Push rod; 89. Push plate.

[0056] 9. Auxiliary mechanism; 91. Mounting base; 92. Mounting bracket; 93. Rubber bladder; 94. Inlet pipe; 95. Outlet pipe; 96. Spring plate; 97. First pulley; 98. Second pulley; 99. Cam; 910. Second belt.

[0057] 10. Panel;

[0058] 11. Support, 12. Adsorption bed, 13. Discharge pipe, 14. Mounting sleeve, 15. Internal gear ring, 16. Gear sleeve, 17. Driven gear, 18. Turntable, 19. Cleaning plate. Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0060] This invention provides a fluoride-contaminated water treatment device and its defluorination process.

[0061] First embodiment:

[0062] Please see Figures 1 to 9 A fluoride-contaminated water treatment device includes a treatment tank 1, a top plate 2, a support 11, a drive mechanism 3, and a feeding mechanism 8.

[0063] The top plate 2 is installed on the top of the processing box 1. A positioning plate 4 is fixedly provided at the middle position of the top of the top plate 2. A positioning frame 5 is installed on the top of the top plate 2 and outside the positioning plate 4. A feeding pipe 6 is fixedly provided inside the positioning frame 5. A rotating pipe 7 is rotatably connected to the bottom end of the feeding pipe 6.

[0064] The drive mechanism 3 includes a motor 31 mounted on the upper surface of the bracket 11. The output shaft of the motor 31 is keyway connected to a drive pulley 32. A ratchet 33 is fixed on the outer wall of the rotating tube 7. A ratchet pulley 34 is meshed with the outer wall of the ratchet pulley 33. A first belt 35 is sleeved on the outer walls of the ratchet pulley 34 and the drive pulley 32. A positioning sleeve 36 is fixed at the bottom end of the ratchet pulley 34.

[0065] The feeding mechanism 8 includes an installation chamber 81 and a truss 82 fixed to the bottom of the top plate 2. Two inclined plates 83 are rotatably installed inside the truss 82 via torsion springs. Inner plates 84 are fixed to the inner walls of both inclined plates 83. A drive rod 85 is connected to the shaft of the drive pulley 32 via a keyway. A half gear 86 is connected to the bottom of the drive rod 85 via a keyway. A rack reciprocating ring 87 is meshed with the outer wall of the half gear 86. A push rod 88 is fixed to the side wall of the rack reciprocating ring 87. A push plate 89 is fixed to the outer end of the push rod 88.

[0066] An adsorption bed 12 is installed on the inner wall of the processing box 1 and below the feeding mechanism 8. A discharge pipe 13 is installed on the side wall of the processing box 1, and a panel 10 is installed on the outer wall of the processing box 1.

[0067] The outer wall of the positioning sleeve 36 is rotatably connected to the inner wall of the positioning plate 4, and the outer wall of the rotating tube 7 is rotatably connected to the inner wall of the top plate 2.

[0068] The outer wall of the drive rod 85 is rotatably connected to the top plate 2 and the mounting chamber 81, and the rack reciprocating ring 87 and the push rod 88 are slidably connected about the mounting chamber 81 in the horizontal direction.

[0069] The two inner plates 84 are in contact with the outer wall of the push plate 89, and the cross-section of the push plate 89 is an equilateral triangle.

[0070] Please see Figure 3 and Figure 4 The user can start the motor 31 and freely control the drive pulley 32 to rotate in both directions. Regardless of whether the drive pulley 32 rotates clockwise or counterclockwise, it can transmit the first belt 35 to control the ratchet pulley 34 to rotate in both directions.

[0071] When the ratchet pulley 34 rotates counterclockwise, the counterclockwise rotation of the ratchet pulley 34 and the ratchet 33 avoid each other. Therefore, the ratchet pulley 34 will not drive the rotating tube 7 to rotate during the counterclockwise rotation process.

[0072] When the ratchet pulley 34 rotates clockwise, the ratchet pulley 34 will be subjected to clockwise force to control the ratchet 33 to drive the rotating tube 7 to form a rotational motion.

[0073] Please see Figure 6 and Figure 7 During initial operation, the two inclined plates 83 are at a slight inclination, and the wastewater in the rotating pipe 7 will enter the adsorption bed 12 in the treatment box 1 through the two inclined plates 83 to carry out defluorination adsorption.

[0074] Please see 7 and Figure 8 During the process of the user starting the motor 31 and controlling the drive pulley 32 to rotate counterclockwise, the drive pulley 32 will control the drive rod 85 to drive the half gear 86 to rotate. The rotation of the half gear 86 meshes and controls the rack reciprocating ring 87 to control the push rod 88 to push the push plate 89 to reciprocate. During the movement of the push plate 89, it pushes the two inner plates 84 to adaptively control the two inclined plates 83 to flip about the hinge of the truss 82 along the inclined surface of the push plate 89. Therefore, the inclined plates 83 achieve reciprocating flipping motion to evenly distribute the sewage in the rotating pipe 7 into the treatment tank 1.

[0075] Please see Figure 9 It is understandable that during the process of sewage flowing out of the rotating pipe 7, some sewage flows into the treatment tank 1 from the middle position of the rotating pipe 7, and the inclined plate 83 diverts the sewage.

[0076] This embodiment:

[0077] By combining diversion and buffering, the two inclined plates 83 first disperse the concentrated inlet water into multiple streams. The inclined angle of the inclined plates 83 reduces the impact speed of the water flow, avoiding direct erosion of the adsorbent layer. At the same time, the synchronous movement of the two inclined plates 83 further disperses the water flow into a thin film or uniform droplets, covering the entire cross-section of the adsorption bed 12.

[0078] Uniform water distribution allows wastewater to flow through the adsorbent layer in a push flow state rather than a disorderly flow. The residence time of the water in the adsorption bed 12 becomes uniform and the average residence time is extended. The dispersion and buffering effect of the inclined plate 83 allows wastewater to contact the adsorbent surface in a thin layer or droplets, reducing the resistance of liquid film mass transfer and accelerating the adsorption reaction.

[0079] The shift from passive water distribution to active water distribution control solves several problems in the adsorption and defluorination system, such as uneven water distribution and insufficient contact. Furthermore, it eliminates the need for additional pretreatment equipment and water distribution devices, simplifying the process structure.

[0080] Second embodiment:

[0081] Please refer to 4. Figures 10 to 11A mounting sleeve 14 is fixedly provided at the bottom of the top plate 2 and outside the rotating tube 7. An internal gear ring 15 is fixedly provided on the inner wall of the mounting sleeve 14. A gear sleeve 16 is fixedly provided on the outer wall of the rotating tube 7 and inside the mounting sleeve 14. A driven gear 17 is meshed with the outer wall of the gear sleeve 16. A turntable 18 is rotatably connected to the bottom of the driven gear 17. A cleaning plate 19 is fixedly provided at the bottom of the turntable 18.

[0082] The driven gear 17 and the internal gear ring 15 mesh with each other, the outer wall of the turntable 18 is rotatably connected to the mounting sleeve 14 through a "T" ring, and the outer wall of the cleaning plate 19 is in contact with the inner wall of the rotating tube 7.

[0083] Please see Figure 4 In the operation of the first embodiment, the ratchet pulley 34 rotates clockwise, which drives the ratchet 33 to control the rotation of the rotating tube 7.

[0084] Please see Figure 10 and Figure 11 During the rotation of the rotating tube 7, the gear sleeve 16 at the bottom end will rotate and mesh with the driven gear 17 to rotate. During the rotation of the driven gear 17, it will mesh with the internal gear ring 15 and along the axis of the internal gear ring 15, thereby realizing the meshing transmission control of the driven gear 17 along the axis of the rotating tube 7 during the rotation of the gear sleeve 16. During the rotation of the driven gear 17, the turntable 18 will drive the cleaning plate 19 to rotate along the axis of the rotating tube 7. During the rotation of the cleaning plate 19, it can rotate and rub against the inner wall of the rotating tube 7.

[0085] Understandably, since the turntable 18 is installed via a "T" ring and mounting sleeve 14, the stability of the turntable 18 during rotation can be guaranteed.

[0086] This embodiment:

[0087] Fluoride ions in wastewater readily react with metal ions such as calcium, magnesium, and aluminum in the water to form insoluble salts such as calcium fluoride and magnesium fluoride. These substances gradually deposit on the inner wall of the pipe to form hard scale. The rotating cleaning plate 19 rotates mechanically and fits tightly against the inner wall of the rotating pipe 7 to scrape away scale and deposits in real time, thus preventing the accumulation of scale.

[0088] The rotating cleaning plate 19 not only removes scale but also reduces the adhesion of scale to the pipe, preventing crevice corrosion. At the same time, the slight friction of the cleaning plate 19 can remove corrosion products from the inner wall of the pipe, reducing the chance of corrosion products reacting with fluoride ions to form new deposits after entering the sewage.

[0089] Third embodiment:

[0090] Please see Figure 12 It also includes auxiliary mechanisms 9;

[0091] The auxiliary mechanism 9 includes a second pulley 98 rotatably connected to the upper surface of the top plate 2. A first pulley 97 is fixedly mounted on the outer wall of the rotating tube 7. A second belt 910 is sleeved on the outer walls of the first pulley 97 and the second pulley 98. A cam 99 is connected to the top of the second pulley 98 via a keyway. A mounting base 91 is installed on the upper surface of the top plate 2 and on one side of the second pulley 98. A mounting bracket 92 is installed on the top of the mounting base 91. A rubber bladder 93 is installed inside the mounting bracket 92. An inlet pipe 94 and an outlet pipe 95 are respectively installed at both ends of the rubber bladder 93. A spring plate 96 is slidably connected to the outside of the mounting bracket 92.

[0092] The cam 99 and the spring plate 96 are in the same horizontal direction, the outer wall of the spring plate 96 is in contact with the outer wall of the rubber bladder 93, and the outlet end of the liquid outlet pipe 95 extends into the interior of the processing box 1.

[0093] Please see Figure 12 In the second embodiment, during the rotation of the rotating tube 7, the first pulley 97 will rotate, which will drive the second belt 910 to control the rotation of the second pulley 98. During the rotation of the second pulley 98, the cam 99 will rotate. When the long end of the cam 99 rotates to the position of the spring plate 96, the cam 99 will abut against the spring plate 96 and squeeze the rubber bladder 93 in the mounting bracket 92. The rubber bladder 93 will be compressed, and the internal medium will be squeezed and transported to the processing tank 1 through the liquid outlet pipe 95.

[0094] Understandably, users can install a media storage tank outside the inlet pipe 94 during actual use and pump the media into the rubber bladder 93.

[0095] This embodiment:

[0096] Compared to traditional designs, this design utilizes an external auxiliary mechanism 9 to precisely add targeted cleaning agents, such as acidic chelating agents and fluoride solvents, during the cleaning process inside the rotating tube 7. This works in conjunction with mechanical cleaning, allowing the cleaning agents to penetrate into the scale layer first. Through chemical action, the scale layer structure is broken down, causing the dense scale layer to loosen and fall off. Simultaneously, the rotating cleaning plate 19 scrapes off the loosened scale layer, preventing scale residue and secondary deposition. This ensures that both the rotating tube 7 and the inside of the treatment box 1 can achieve the cleaning purpose.

[0097] Scaling and blockage in the adsorption bed 12 can lead to local adsorption blind spots, where some adsorbents are not fully utilized. In-situ cleaning via auxiliary mechanism 9 can remove scale and restore adsorbent activity in real time, ensuring uniform adsorption reaction in the adsorption bed 12 and avoiding local saturation and secondary pollution. At the same time, the cleaning agent itself does not introduce impurities that interfere with fluoride ion adsorption.

[0098] A process for defluoridating fluoride-contaminated water includes the following steps:

[0099] S1: Mix calcium salt, phosphate and a small amount of aluminum salt in a certain proportion, add dispersant and stir to form a uniform solution;

[0100] Calcium nitrate and diammonium hydrogen phosphate are used as raw materials, mixed at a Ca / P molar ratio of 1.65-1.69; aluminum nitrate is added to achieve 3%-5% Al. 3 + Doping enhances the surface positive charge density; 0.5% polyethylene glycol (PEG-6000) is added as a dispersant to inhibit crystal aggregation;

[0101] S2: The mixed solution is transferred to a high-pressure reactor and reacted at high temperature for a certain time to generate nanostructured materials;

[0102] The mixed solution was hydrothermally reacted at 180-200℃ for 10-14h to generate nanorod-shaped HAP (diameter 20-50nm, aspect ratio 5:1-8:1).

[0103] S3: After the reaction is complete, the product is collected by centrifugation, washed alternately with deionized water and ethanol, and dried to obtain powder;

[0104] The product was washed alternately with deionized water and ethanol, and then dried under vacuum at 60°C for 12 hours.

[0105] S4: Calcine the dried powder at a certain temperature to improve the crystallinity and stability of the material;

[0106] Calcination at 600-650℃ for 1.5-2 hours, with a heating rate of 3℃ / min;

[0107] S5: Fill the adsorption column with modified material particles and control the packing density and bed height;

[0108] The bed is filled with modified HAP particles (particle size 0.5-1.0 mm), with a filling density of 0.8-1.2 g / cm3 and a bed height of 30-80 cm.

[0109] S6: Pre-rinse the adsorption column with dilute acid solution to activate the surface adsorption sites;

[0110] Pre-rinse and activate using 0.01 mol / L HCl at pH 6.0;

[0111] S7: Fluoride-containing water is passed through an adsorption column at a certain flow rate, and the fluoride concentration in the water is detected in real time up to the breakthrough point;

[0112] When the fluoride concentration is ≤10mg / L, the flow rate is 8-10 BV / h; when it is >10mg / L, it is reduced to 5-7 BV / h. The pH range of 5.5-8.0 can be directly treated without adjusting the pH of the raw water.

[0113] S8: After breakthrough, backwash the adsorption column with a low-concentration alkaline solution to elute the adsorbed fluoride ions;

[0114] After breakthrough, continue running until saturation, and backwash with 0.1-0.3 mol / L NaOH solution (flow rate 2-4 BV / h). The elution endpoint is defined as pH ≥ 11.0 or fluoride concentration in the eluent < 50 mg / L.

[0115] S9: Soak the adsorption column in a dilute acid solution to restore the surface activity of the material, and then rinse with water until neutral.

[0116] Immerse in 0.05 mol / L HCl at pH 3.0-4.0 for 10-15 min to restore surface active sites; rinse with deionized water until neutral (pH 6.5-7.5) to complete regeneration.

[0117] S10: Add calcium salt to the elution waste liquid to precipitate fluoride ions, filter and recover the precipitate, and discharge it after treatment to meet the standards.

[0118] Please refer to the reference again. Figures 1 to 13 The working principle of the fluoride-contaminated water treatment equipment and its defluorination process provided by this invention is as follows:

[0119] Step S1: Add fluoride-containing wastewater;

[0120] During the process of the user starting the motor 31 and controlling the drive pulley 32 to rotate counterclockwise, the drive pulley 32 will control the drive rod 85 to drive the half gear 86 to rotate. The rotation of the half gear 86 meshes and controls the rack reciprocating ring 87 to control the push rod 88 to push the push plate 89 to reciprocate. During the movement of the push plate 89, it pushes the two inner plates 84 to adaptively control the two inclined plates 83 to flip about the hinge of the truss 82 along the inclined surface of the push plate 89. Therefore, the inclined plate 83 achieves the reciprocating flipping motion to evenly distribute the sewage in the rotating pipe 7 into the treatment tank 1. During the process of sewage flowing out of the rotating pipe 7, some sewage flows into the treatment tank 1 from the middle position of the rotating pipe 7. The inclined plate 83 then diverts the sewage. The sewage enters the adsorption bed 12 for adsorption treatment. Finally, the water is discharged from the discharge pipe 13.

[0121] Step S2: Clean the treatment box 1 and rotating tube 7 after adsorption treatment;

[0122] When the ratchet pulley 34 rotates clockwise, it will be subjected to clockwise force to control the ratchet 33 to drive the rotating tube 7 to rotate. During the rotation of the rotating tube 7, the gear sleeve 16 at the bottom end will rotate and mesh with the driven gear 17 to rotate. During the rotation of the driven gear 17, it will mesh with the internal gear ring 15 and along the axis of the internal gear ring 15, thereby realizing the meshing transmission control of the driven gear 17 to rotate along the axis of the rotating tube 7 during the rotation of the gear sleeve 16. During the rotation of the driven gear 17, the turntable 18 will drive the cleaning plate 19 to rotate along the axis of the rotating tube 7. During the rotation of the cleaning plate 19, it can rotate and rub against the inner wall of the rotating tube 7. The scale inside the rotating tube 7 can be removed by the rotation of the cleaning plate 19.

[0123] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A fluoride-contaminated water treatment device, characterized in that, Includes a processing box, top plate, support frame, drive mechanism, and unloading mechanism; The top plate is installed on the top of the processing box. A positioning plate is fixed in the middle of the top of the top plate. A positioning frame is installed on the top of the top plate and outside the positioning plate. A feeding pipe is fixed inside the positioning frame. A rotating pipe is rotatably connected to the bottom end of the feeding pipe. The drive mechanism includes a motor mounted on the upper surface of the bracket, a drive pulley connected to the keyway of the motor output shaft, a ratchet fixed to the outer wall of the rotating tube, a ratchet pulley meshing with the outer wall of the ratchet pulley, a first belt sleeved on the outer walls of the ratchet pulley and the drive pulley, and a positioning sleeve fixed to the bottom end of the ratchet pulley. The feeding mechanism includes an installation chamber and a truss fixed to the bottom of the top plate. Two inclined plates are rotatably installed inside the truss via torsion springs. Inner plates are fixed to the inner walls of both inclined plates. A drive rod is connected to the drive pulley shaft via a keyway. A half gear is connected to the bottom of the drive rod via a keyway. A rack reciprocating ring is meshed with the outer wall of the half gear. A push rod is fixed to the side wall of the rack reciprocating ring. A push plate is fixed to the outer end of the push rod. An adsorption bed is installed on the inner wall of the processing box and below the feeding mechanism. A discharge pipe is installed on the side wall of the processing box, and a panel is installed on the outer wall of the processing box.

2. The fluoride-contaminated water treatment equipment according to claim 1, characterized in that, The outer wall of the positioning sleeve is rotatably connected to the inner wall of the positioning plate, and the outer wall of the rotating tube is rotatably connected to the inner wall of the top plate.

3. The fluoride-contaminated water treatment equipment according to claim 1, characterized in that, The outer wall of the drive rod is rotatably connected to the top plate and the mounting chamber, and the rack reciprocating ring and the push rod are slidably connected about the horizontal direction of the mounting chamber.

4. The fluoride-contaminated water treatment equipment according to claim 1, characterized in that, The two inner plates are in contact with the outer wall of the push plate, and the cross-section of the push plate is an equilateral triangle.

5. The fluoride-contaminated water treatment equipment according to claim 1, characterized in that, An installation sleeve is fixedly provided at the bottom of the top plate and outside the rotating tube. An internal gear ring is fixedly provided on the inner wall of the installation sleeve. A gear sleeve is fixedly provided on the outer wall of the rotating tube and inside the installation sleeve. A driven gear is meshed with the outer wall of the gear sleeve. A turntable is rotatably connected to the bottom of the driven gear. A cleaning plate is fixedly provided at the bottom of the turntable.

6. The fluoride-contaminated water treatment equipment according to claim 5, characterized in that, The driven gear and the internal gear ring mesh with each other, the outer wall of the turntable is rotatably connected to the mounting sleeve through a "T" ring, and the outer wall of the cleaning plate is in contact with the inner wall of the rotating tube.

7. The fluoride-contaminated water treatment equipment according to claim 1, characterized in that, It also includes auxiliary mechanisms; The auxiliary mechanism includes a second pulley rotatably connected to the upper surface of the top plate, a first pulley fixed to the outer wall of the rotating tube, a second belt sleeved on the outer walls of the first and second pulleys, a cam connected to the top of the second pulley via a keyway, a mounting seat installed on the upper surface of the top plate and on one side of the second pulley, a mounting frame installed on the top of the mounting seat, a rubber bladder installed inside the mounting frame, an inlet pipe and an outlet pipe respectively installed at both ends of the rubber bladder, and a spring plate slidably connected to the outside of the mounting frame.

8. The fluoride-contaminated water treatment equipment according to claim 7, characterized in that, The cam and the spring plate are in the same horizontal direction, the outer wall of the spring plate is in contact with the outer wall of the rubber bladder, and the outlet end of the liquid outlet pipe extends into the interior of the treatment tank.

9. A process for defluoridation of fluoride-contaminated water, characterized in that, The aforementioned defluoridation process for fluoride-contaminated water includes a fluoride-contaminated water treatment device as described in any one of claims 1-8, comprising the following steps: S1: Mix calcium salt, phosphate and a small amount of aluminum salt in a certain proportion, add dispersant and stir to form a uniform solution; S2: The mixed solution is transferred to a high-pressure reactor and reacted at high temperature for a certain time to generate nanostructured materials; S3: After the reaction is complete, the product is collected by centrifugation, washed alternately with deionized water and ethanol, and dried to obtain powder; S4: Calcine the dried powder at a certain temperature to improve the crystallinity and stability of the material; S5: Fill the modified material particles into the adsorption column and control the packing density and bed height; S6: Pre-rinse the adsorption column with dilute acid solution to activate the surface adsorption sites; S7: Fluorine-containing water is passed through the adsorption column at a certain flow rate, and the fluoride concentration in the water is detected in real time up to the breakthrough point. Fluorine-containing wastewater needs to enter the adsorption bed in the treatment tank for fluoride removal adsorption during the adsorption process. S8: After breakthrough, backwash the adsorption column with a low-concentration alkaline solution to elute the adsorbed fluoride ions; S9: Soak the adsorption column in a dilute acid solution to restore the surface activity of the material, and then rinse with water until neutral. S10: Add calcium salt to the elution waste liquid to precipitate fluoride ions, filter and recover the precipitate, and discharge it after treatment to meet the standards.

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