A deep treatment device for fluoride ions

Abstract

The utility model belongs to fluorine ion sewage treatment technical field especially relates to a kind of fluorine ion advanced treatment device, the advanced treatment device includes primary defluorination reaction pool, secondary defluorination reaction pool, magnetic powder reaction pool, flocculator and sedimentation tank, a primary defluorination reaction stirrer is installed in the primary defluorination reaction pool, secondary defluorination reaction stirrer is installed in the secondary defluorination reaction pool, magnetic powder reaction stirrer is installed in the magnetic powder reaction pool, flocculator stirrer is installed in the flocculator, mud scraper is installed in the sedimentation tank. The utility model main part adopts magnetic coagulation process, and carries out the targeted design, cooperates the use of efficient defluorination agent, using magnetic coagulation process can solve the problem that sludge floc is lighter in coagulation defluorination reaction, not easy to settle, can reduce sedimentation area, improve sedimentation effect, applicable to the efficient removal of fluoride in industrial wastewater, mine water and municipal sewage.

Description

Technical Field

[0001] This utility model belongs to the field of fluoride ion wastewater treatment technology, and in particular relates to a deep treatment device for fluoride ions. Background Technology

[0002] Fluoride concentrations in wastewater from industrial production (such as photovoltaic, metallurgy, and chemical industries) often exceed standards. Direct discharge can lead to ecological damage to aquatic bodies and risks to human health. Therefore, it is necessary to treat fluoride in wastewater. Traditional treatment methods include chemical precipitation, which has gradually evolved into magnetic coagulation technology. Magnetic coagulation technology enhances the density of flocs by adding magnetic powder and achieves rapid sedimentation by combining magnetic separation. It has advantages such as high treatment efficiency and small footprint.

[0003] A reference document (publication number CN212655596U) discloses an industrial wastewater deep defluorination treatment device, including a regulating tank. The upper surface of the regulating tank is provided with a first feeding port, and the upper surface of the regulating tank and located to the right of the first feeding port is provided with a wastewater inlet. A first connecting pipe is fixedly connected to the right side of the regulating tank, and a sedimentation tank is fixedly connected to the end of the first connecting pipe away from the regulating tank.

[0004] However, existing magnetic coagulation devices have shortcomings in the deep treatment of fluorides. Specifically, the reaction conditions in the magnetic coagulation device are not optimized for the characteristics of fluoride ions, resulting in insufficient removal rate. At the same time, due to unreasonable design of the magnetic separation equipment, there is also the problem of low magnetic powder recovery rate. Utility Model Content

[0005] This invention addresses the shortcomings of existing magnetic coagulation devices in the deep treatment of fluorides, namely, the lack of optimization of reaction conditions in magnetic coagulation devices for the characteristics of fluoride ions, resulting in insufficient removal rates, and the low magnetic powder recovery rate due to unreasonable design of magnetic separation equipment.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A deep treatment device for fluoride ions includes a primary defluorination reaction tank, a secondary defluorination reaction tank, a magnetic powder reaction tank, a flocculation tank, and a sedimentation tank. A primary defluorination reaction mixer is installed in the primary defluorination reaction tank; a secondary defluorination reaction mixer is installed in the secondary defluorination reaction tank; a magnetic powder reaction mixer is installed in the magnetic powder reaction tank; a flocculation mixer is installed in the flocculation tank; and a sludge scraper is installed in the sedimentation tank. The primary defluorination reaction tank is connected to the secondary defluorination reaction tank; the primary defluorination reaction tank is connected to the magnetic powder reaction tank; the magnetic powder reaction tank is connected to the flocculation tank; and the flocculation tank is connected to the sedimentation tank. A pH meter is also installed in the primary defluorination reaction tank.

[0008] An outlet is provided on one side of the sedimentation tank, and a sludge hopper is provided at the bottom of the sedimentation tank. The sludge hopper is connected to a return sludge pump and a magnetic powder recovery pump. The magnetic powder recovery pump is connected to a primary magnetic separator through a high-shear machine. The primary magnetic separator is connected to a secondary magnetic separator. The primary magnetic separator, the secondary magnetic separator, and the return sludge pump are all connected to the magnetic powder reaction tank.

[0009] Preferably, each of the primary defluorination reaction tank, secondary defluorination reaction tank, magnetic powder reaction tank, flocculation tank, and sedimentation tank is equipped with a mounting frame. The primary defluorination reaction mixer, secondary defluorination reaction mixer, magnetic powder reaction mixer, flocculation mixer, and sludge scraper are all installed and fixed by the mounting frame. The pH meter is also fixedly installed on the mounting frame, and the lower end of the pH meter is inserted into the primary defluorination reaction tank.

[0010] Preferably, the input end of the magnetic powder recovery pump is connected to the sludge hopper, the output end of the magnetic powder recovery pump is connected to the high shear machine, the input end of the return sludge pump is also connected to the sludge hopper, and the output end of the return sludge pump is connected to the magnetic powder reaction tank.

[0011] Preferably, the input end of the secondary magnetic separator is connected to the output end of the primary magnetic separator. The secondary magnetic separator has two output ends, namely a second output end and a sludge discharge end. The second output end is connected to the magnetic powder reaction tank, and the sludge discharge end is used for sludge discharge.

[0012] Preferably, the input end of the primary magnetic separator is connected to the output end of the high-shear machine. The primary magnetic separator has two output ends, namely a first output end and a conveying end. The first output end is connected to the magnetic powder reaction tank, and the conveying end is connected to the input end of the secondary magnetic separator.

[0013] Preferably, the primary defluorination reaction tank contains a defluorinating agent and an alkali, the magnetic powder reaction tank contains magnetic powder, the flocculation tank contains PAM, the magnetic strength of the magnetic drum surface of the primary magnetic separator is 3000 gs, and the magnetic strength of the magnetic drum surface of the secondary magnetic separator is 5000-6000 gs.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This device can achieve efficient defluorination. It uses a two-stage defluorination reaction tank and is equipped with automatic pH control. Under the action of magnetic powder, it can achieve efficient defluorination, which not only increases the reaction time but also reduces short-circuiting, making the reaction more thorough. The amount of alkali added is automatically controlled according to the pH meter to ensure that the reaction conditions are within the optimal range.

[0016] 2. The main body of this device adopts magnetic coagulation technology and has been specifically designed. With the use of a high-efficiency defluoridating agent, when the influent fluoride ion concentration is 10-20 mg / L, the effluent fluoride ion concentration can be lower than 0.5 mg / L. The magnetic coagulation technology can solve the problem of light sludge flocs that are not easy to settle in the coagulation defluorination reaction, reduce the sedimentation area, and improve the sedimentation effect. It is suitable for the efficient removal of fluoride from industrial wastewater, mine water and municipal sewage.

[0017] 3. This device can improve the magnetic seed recovery efficiency. The two-stage gradient magnetic separator design sorts and recovers the magnetic powder separately, which improves the magnetic seed recovery efficiency, reduces magnetic seed loss, avoids waste, and thus reduces wastewater treatment costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of one side of a deep fluoride ion treatment device proposed in this utility model.

[0019] Figure 2 This is a schematic diagram of the other side of a fluoride ion deep treatment device proposed in this utility model.

[0020] Figure 3 This is a schematic diagram of the internal structure of a deep fluoride ion treatment device proposed in this utility model.

[0021] Figure 4 This is a simplified plan view of a fluoride ion deep treatment device proposed in this utility model.

[0022] In the diagram: 1. Primary defluorination reaction mixer; 2. Secondary defluorination reaction mixer; 3. Magnetic powder reaction mixer; 4. Flocculation mixer; 5. Sludge scraper; 6. Return sludge pump; 7. Magnetic powder recovery pump; 8. High shear machine; 9. Primary magnetic separator; 10. Secondary magnetic separator; 11. pH meter; 12. Primary defluorination reaction tank; 13. Secondary defluorination reaction tank; 14. Magnetic powder reaction tank; 15. Flocculation tank; 16. Sedimentation tank; 17. Outlet; 18. Sludge hopper. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Reference Figures 1-4 A deep treatment device for fluoride ions includes a primary defluorination reaction tank 12, a secondary defluorination reaction tank 13, a magnetic powder reaction tank 14, a flocculation tank 15, and a sedimentation tank 16. A primary defluorination reaction agitator 1 is installed in the primary defluorination reaction tank 12, a secondary defluorination reaction agitator 2 is installed in the secondary defluorination reaction tank 13, a magnetic powder reaction agitator 3 is installed in the magnetic powder reaction tank 14, a flocculation agitator 4 is installed in the flocculation tank 15, and a sludge scraper 5 is installed in the sedimentation tank 16. The primary defluorination reaction tank 12 is connected to the secondary defluorination reaction tank 13, the primary defluorination reaction tank 12 is connected to the magnetic powder reaction tank 14, the magnetic powder reaction tank 14 is connected to the flocculation tank 15, the flocculation tank 15 is connected to the sedimentation tank 16, and a pH meter 11 is also installed in the primary defluorination reaction tank 12.

[0026] An outlet 17 is provided on one side of the sedimentation tank 16, and a sludge hopper 18 is provided at the bottom of the sedimentation tank 16. The sludge hopper 18 is connected to a return sludge pump 6 and a magnetic powder recovery pump 7. The magnetic powder recovery pump 7 is connected to a primary magnetic separator 9 through a high shear machine 8. The primary magnetic separator 9 is connected to a secondary magnetic separator 10. The primary magnetic separator 9, the secondary magnetic separator 10, and the return sludge pump 6 are all connected to the magnetic powder reaction tank 14.

[0027] Mounting frames are installed on the primary defluorination reaction tank 12, secondary defluorination reaction tank 13, magnetic powder reaction tank 14, flocculation tank 15, and sedimentation tank 16. The primary defluorination reaction mixer 1, secondary defluorination reaction mixer 2, magnetic powder reaction mixer 3, flocculation mixer 4, and sludge scraper 5 are all installed and fixed using these mounting frames. A pH meter 11 is also fixedly mounted on the mounting frame, with its lower end inserted into the primary defluorination reaction tank 12. During operation, the addition of the pH meter 11 allows for real-time monitoring of the pH value within the primary defluorination reaction tank 12, effectively controlling the reaction process and facilitating adjustments to the amount of defluorinating agent added.

[0028] The input end of the magnetic powder recovery pump 7 is connected to the sludge hopper 18, and the output end of the magnetic powder recovery pump 7 is connected to the high-shear mill 8. The input end of the return sludge pump 6 is also connected to the sludge hopper 18, and the output end of the return sludge pump 6 is connected to the magnetic powder reaction tank 14. The sludge output from the sludge hopper 18 at the lower end of the sedimentation tank 16 consists of part untreated sludge and part sludge with flocculent material. The treated sludge enters the magnetic powder recovery pump 7 and is recovered by the high-shear mill 8 and the primary magnetic separator 9. The untreated sludge is returned to the magnetic powder reaction tank 14 by the return sludge pump 6 for further treatment. The sludge is classified and treated to ensure effective and thorough treatment.

[0029] The input end of the secondary magnetic separator 10 is connected to the output end of the primary magnetic separator 9. The secondary magnetic separator 10 has two output ends: a second output end and a sludge discharge end. The second output end is connected to the magnetic powder reaction tank 14, and the sludge discharge end is used for sludge discharge. The secondary magnetic separator 10 receives sludge that has been processed once by the primary magnetic separator 9 and performs secondary treatment to ensure thorough separation. The fully treated sludge is discharged through the sludge discharge end, while the sludge that has not been properly flocculated is fed back into the magnetic powder reaction tank 14 through the second output end for magnetic reaction treatment.

[0030] The input end of the primary magnetic separator 9 is connected to the output end of the high-shear separator 8. The primary magnetic separator 9 has two output ends: a primary output end and a conveying end. The primary output end is connected to the magnetic powder reaction tank 14, and the conveying end is connected to the input end of the secondary magnetic separator 10. The primary magnetic separator 9 is used to recover sludge from the sedimentation tank 16 and to recover magnetic powder from the sludge. The high-shear separator 8 is used to shear and separate the sludge and magnetic powder, thereby facilitating recycling and processing.

[0031] The primary defluorination reaction tank 12 contains a defluorinating agent and alkali, the magnetic powder reaction tank 14 contains magnetic powder, and the flocculation tank 15 contains PAM. The magnetic strength of the magnetic drum surface of the primary magnetic separator 9 is 3000 gs, and the magnetic strength of the magnetic drum surface of the secondary magnetic separator 10 is 5000-6000 gs. The primary magnetic separator 9 is used to recover magnetic powder with smaller mesh size, and the secondary magnetic separator 10 is used to recover finer magnetic powder with weaker magnetic force. Through the two-stage step recovery of the primary magnetic separator 9 and the secondary magnetic separator 10, more efficient recovery of magnetic powder can be achieved at a lower cost.

[0032] Fluoride-containing wastewater enters the defluorination reaction tank. The primary defluorination reaction tank 12 contains defluorinating agents and alkalis. The defluorinating agents include, but are not limited to, lime, aluminum salts, calcium salts, magnesium salts, aluminum hydroxide, and activated carbon. The alkalis include, but are not limited to, sodium hydroxide, sodium carbonate, and lime. Under the action of the primary defluorination reaction mixer 1 and the secondary defluorination reaction mixer 2, the fluoride ions in the water react fully with the defluorinating agents to form insoluble flocs. The amount of alkali added is controlled by the pH meter 11 in the primary defluorination reaction tank 12 to ensure that the pH in the defluorination reaction tank is within the optimal range. This two-stage defluorination reaction not only increases the reaction time but also reduces short-circuiting, making the reaction more thorough. The addition of alkali and the pH meter 11 in the primary defluorination reaction tank 12 can solve the adverse effects of pH increases caused by conventional defluorinating agent addition. The pH meter data can be uploaded to the control system to automatically control the amount of alkali added, ensuring that the reaction conditions are within the optimal range.

[0033] After being treated in the primary defluorination reaction tank 12 and the secondary defluorination reaction tank 13, the sample enters the magnetic powder reaction tank 14, where it reacts with magnetic powder under the action of the magnetic powder reaction stirrer 3. The magnetic powder is either newly added, separated and recovered by the primary magnetic separator 9 and the secondary magnetic separator 10, or returned from the sludge return pump 6. The reaction generates flocs containing magnetic powder.

[0034] Then, the sludge enters the flocculation tank 15 and is formed into larger flocs by the flocculation mixer 4 and PAM. Finally, it enters the sedimentation tank 16. Under the action of the sludge scraper 5, which can be a center drive type or a chain plate type, the sludge is collected into the sludge hopper 18, and the supernatant is discharged through the outlet 17.

[0035] Part of the sludge at sludge hopper 18 is transported to magnetic powder reaction tank 14 by return sludge pump 6. Excess sludge is transported to primary magnetic separator 9 by magnetic powder recovery pump 7. Magnetic powder recovery pump 7 then passes through high shear separator 8 into primary magnetic separator 9, where the sludge and magnetic powder are sheared and separated. The sludge is then recovered by primary magnetic separator 9. The discharged sludge is then recovered by secondary magnetic separator 10, and the recovered magnetic powder enters magnetic powder reaction tank 14. Finally, the discharged sludge is treated by secondary magnetic separator 10. The sludge containing magnetic powder undergoes further concentration and dewatering. Due to the large amount of sludge produced and relatively high magnetic powder loss in the defluorination process, a two-stage magnetic separator design is adopted. The magnetic strength of the magnetic drum surface of the first-stage magnetic separator 9 is about 3000gs, which recovers magnetic powder with smaller mesh size. The magnetic strength of the magnetic drum surface of the second-stage magnetic separator 10 is 5000-6000gs, which recovers magnetic powder with even smaller mesh size. With the recovery of the two-stage gradient magnetic separator, the cost of using the magnetic separator is relatively small, and more efficient recovery of magnetic powder is achieved.

[0036] The mixer is used for mixing and stirring to promote the reaction; the sludge scraper 5 is used to treat the sludge in the sedimentation tank; the magnetic separator separates magnetic materials by adsorbing them with a magnetic field; the high shear machine 8 uses shear force to decompose flocs and recover magnetic powder; and the working principle and structural design of the return sludge pump 6 and the magnetic powder recovery pump 7 are all existing technologies, and their working principles will not be explained in detail here.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A deep treatment device for fluoride ions, characterized in that, The advanced treatment device includes a primary defluorination reaction tank (12), a secondary defluorination reaction tank (13), a magnetic powder reaction tank (14), a flocculation tank (15), and a sedimentation tank (16). The primary defluorination reaction tank (12) is equipped with a primary defluorination reaction mixer (1), the secondary defluorination reaction tank (13) is equipped with a secondary defluorination reaction mixer (2), the magnetic powder reaction tank (14) is equipped with a magnetic powder reaction mixer (3), the flocculation tank (15) is equipped with a flocculation mixer (4), and the sedimentation tank (16) is equipped with a sludge scraper (5). The primary defluorination reaction tank (12) is connected to the secondary defluorination reaction tank (13), the primary defluorination reaction tank (12) is connected to the magnetic powder reaction tank (14), the magnetic powder reaction tank (14) is connected to the flocculation tank (15), the flocculation tank (15) is connected to the sedimentation tank (16), and a pH meter (11) is also installed in the primary defluorination reaction tank (12). An outlet (17) is provided on one side of the sedimentation tank (16), and a sludge hopper (18) is provided at the bottom of the sedimentation tank (16). The sludge hopper (18) is connected to a return sludge pump (6) and a magnetic powder recovery pump (7). The magnetic powder recovery pump (7) is connected to a primary magnetic separator (9) through a high shear machine (8). The primary magnetic separator (9) is connected to a secondary magnetic separator (10). The primary magnetic separator (9), the secondary magnetic separator (10), and the return sludge pump (6) are all connected to the magnetic powder reaction tank (14).

2. The deep treatment device for fluoride ions according to claim 1, characterized in that, Mounting frames are provided on the primary defluorination reaction tank (12), secondary defluorination reaction tank (13), magnetic powder reaction tank (14), flocculation tank (15) and sedimentation tank (16). The primary defluorination reaction mixer (1), secondary defluorination reaction mixer (2), magnetic powder reaction mixer (3), flocculation mixer (4) and sludge scraper (5) are all installed and fixed by the mounting frames. The pH meter (11) is also fixedly installed on the mounting frame, and the lower end of the pH meter (11) is inserted into the primary defluorination reaction tank (12).

3. The device for deep treatment of fluorine ions according to claim 1, characterized in that The input end of the magnetic powder recovery pump (7) is connected to the sludge hopper (18), the output end of the magnetic powder recovery pump (7) is connected to the high shear machine (8), the input end of the return sludge pump (6) is also connected to the sludge hopper (18), and the output end of the return sludge pump (6) is connected to the magnetic powder reaction tank (14).

4. The deep treatment device for fluoride ions according to claim 1, characterized in that, The input end of the secondary magnetic separator (10) is connected to the output end of the primary magnetic separator (9). The secondary magnetic separator (10) has two output ends, namely the second output end and the sewage discharge end. The second output end is connected to the magnetic powder reaction tank (14), and the sewage discharge end is used for sludge discharge.

5. The device for deep treatment of fluorine ions according to claim 1, characterized in that The input end of the primary magnetic separator (9) is connected to the output end of the high shear machine (8). The primary magnetic separator (9) has two output ends, namely the first output end and the conveying end. The first output end is connected to the magnetic powder reaction tank (14), and the conveying end is connected to the input end of the secondary magnetic separator (10).

6. The deep treatment device for fluoride ions according to claim 1, characterized in that, The primary defluorination reaction tank (12) contains defluorinating agent and alkali, the magnetic powder reaction tank (14) contains magnetic powder, the flocculation tank (15) contains PAM, the magnetic strength of the magnetic drum surface of the primary magnetic separator (9) is 3000gs, and the magnetic strength of the magnetic drum surface of the secondary magnetic separator (10) is 5000-6000gs.

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