A device for deep fluorine removal of fluorine-containing wastewater

Abstract

The utility model discloses a device of fluorine -containing wastewater advanced defluorination, include: pretreatment box, the pretreatment box outside fixedly connected with first water pump, first water pump side fixedly connected with reaction box, reaction box outside fixedly connected with second water pump, the water outlet one side of second water pump fixedly connected with adsorption tower, adsorption tower bottom fixedly connected with drainage pump, the utility model discloses in pretreatment box adopts the ladder -type physical interception of oblique grid grating and coarse filter assembly combination, can quick separation big granule impurity again, and through the fine quartz sand filter plate retention microsuspensoid, significantly reduce the load of subsequent processing unit, guarantee the long -term stable operation of reaction box and adsorption tower.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment equipment technology, specifically a device for deep defluorination of fluoride-containing wastewater. Background Technology

[0002] Wastewater defluoridation refers to the technical process of removing excess fluoride ions from industrial or domestic wastewater through physical, chemical, or biological means. Fluoride is widely present in nature, but some industrial activities can lead to fluoride concentrations in wastewater far exceeding environmental safety limits. Fluoride ions are chemically stable and easily accumulate in the environment over a long period through the water cycle. High concentrations of fluoride can cause irreversible damage to human bones and teeth, are toxic to animals and plants, and may disrupt the ecological balance of soil and groundwater. Therefore, wastewater defluoridation is a crucial step in ensuring environmental safety and human health. Based on the fluoride concentration, water quality characteristics, and discharge standards, processes such as precipitation, adsorption, ion exchange, and membrane separation should be selected to achieve efficient fluoride retention or conversion, ultimately reducing the effluent fluoride concentration to below 1.5 mg / L. The treatment process also needs to address challenges such as sludge disposal, adsorbent regeneration, and operating costs to balance technical feasibility and economic efficiency.

[0003] According to patent publication number CN214299356U, a device for deep defluorination of fluoride-containing wastewater is disclosed. This device sets limit structures on both sides of the stirring rod, and then injects wastewater into the interior of the mixing tank through the inlet. Then, the operator starts the servo motor. When the servo motor rotates and drives the stirring rod to rotate, the stirring rod will drive the limit rod to rotate. Then, the limit rod drives the limit block to rotate inside the slide groove, which prevents the stirring rod from moving and causing damage when it drives the stirring frame to stir.

[0004] A heating mechanism is installed at the bottom of one side inside the mixing tank. The operator injects the neutralizing agent through the inlet. When stirring is required, the operator activates the heating mechanism. The heating wire generates heat, which is then quickly transferred out through the heat-conducting layer, allowing the wastewater and neutralizing agent to react quickly. After the reaction is completed, the wastewater is discharged through the outlet.

[0005] By installing a cleaning structure at the top inside the support base, when the mixing tank needs to be cleaned after the work is completed, the staff starts the water pump. The water pump draws water from the water tank through one end of the water pipe and then injects it into the nozzle through the other end of the water pipe. The nozzle is then pressurized inside and sprays the inside of the mixing tank evenly to wash away any remaining impurities.

[0006] However, the drawback of this patented device is that its treatment process for fluoride-containing wastewater lacks a sufficient impurity pre-screening mechanism. After the wastewater enters the reaction tank directly, the suspended particles that have not been filtered in advance are easily mixed with the neutralizing agent to form silt, which leads to increased stirring resistance and reduced heat transfer efficiency of the heating mechanism. Excessive impurity residue will increase the workload of the cleaning structure, and frequent cleaning may accelerate the wear of the stirring mechanism and affect the stability of continuous operation. In addition, the single chemical precipitation treatment method is not effective for deep separation of low-concentration fluoride ions. The wastewater after the reaction lacks secondary adsorption or filtration enhancement methods for residual fluoride, which may lead to fluctuations or repeated exceedances of the effluent fluoride concentration. Utility Model Content

[0007] The purpose of this invention is to provide a device for deep defluorination of fluoride-containing wastewater in order to solve the problems mentioned in the background.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a device for deep defluorination of fluoride-containing wastewater, comprising: a pretreatment tank, a first water pump fixedly connected to the outside of the pretreatment tank, a reaction tank fixedly connected to the side of the first water pump, a second water pump fixedly connected to the outside of the reaction tank, an adsorption tower fixedly connected to one side of the outlet end of the second water pump, and a drainage pump fixedly connected to the bottom of the adsorption tower.

[0009] The pretreatment tank is used to block and filter particulate impurities in the wastewater;

[0010] The reaction chamber is used for the chemical precipitation of fluoride ions in wastewater;

[0011] The adsorption tower is used for secondary removal of residual fluoride ions in wastewater.

[0012] As a further embodiment of this utility model: the pretreatment box includes a water inlet pipe fixedly connected to the top cover of the pretreatment box; an inclined mesh grid is fixedly welded to the upper inner side of the pretreatment box near the water inlet; a coarse filter assembly is fixedly connected below the inclined mesh grid; a drain hopper is fixedly connected to the inner side of the pretreatment box near the lower part of the coarse filter assembly; a water pipe is fixedly connected below the drain hopper; the water pipe passes through the side wall of the pretreatment box and is fixedly connected to the first water pump; a slag discharge port is opened on the side wall of the pretreatment box; and a slag discharge inclined plate is fixedly welded to the outer side of the pretreatment box near the lower part of the slag discharge port.

[0013] The coarse filtration assembly includes an insert plate fixedly welded to the inside of the pretreatment box, a filter plate fixedly inserted into the inside of the insert plate, and a seepage plate fixedly connected below the filter plate.

[0014] As a further embodiment of this utility model: a motor is fixedly connected to the top of the reaction chamber, a transmission rod is connected to the side of the motor via a belt drive, a stirring paddle is fixedly connected to the bottom of the transmission rod through the top of the reaction chamber, a dosing pump is fixedly connected to the side of the top of the reaction chamber near the transmission rod, a heating tube is fixedly connected to the inner side wall of the reaction chamber, a power supply assembly is fixedly connected to the top of the reaction chamber near the edge, the power transmission end of the power supply assembly passes through the top of the reaction chamber and is electrically connected to the heating tube, and a bottom door is provided on the side of the reaction chamber near the ground.

[0015] As a further embodiment of this utility model: the adsorption tower is composed of multiple placement layers, the inner side of the placement layer is filled with adsorption blocks, the bottom of the placement layer is provided with through holes, the outer side of the placement layer is fixedly welded with fixing lugs, and the upper part of the fixing lugs is fixedly screwed with connecting bolts.

[0016] As a further embodiment of this utility model: the position of the slag discharge port corresponds to the position of the inclined grid, the slag discharge inclined plate is fixedly connected to the outside of the pretreatment box by a connecting rod, the liquid discharge hopper is located below the seepage plate, and the size of the liquid discharge hopper is larger than the area of ​​the seepage plate, and the filter plate is filled with fine quartz sand.

[0017] As a further embodiment of this utility model: the dosing pump is filled with flocculant, the bottom of the inner side of the reaction tank is lined with lime, the bottom door is used to clean the sediment and replace the lime, and a filter pipe is fixedly connected to the connection between the second water pump and the reaction tank.

[0018] As a further embodiment of this utility model: the multiple sets of placement layers are fixedly connected by the fixed hooks, the size of the through holes in the multiple sets of placement layers decreases and the mesh count increases from top to bottom, and the adsorption block is filled with fluorine-absorbing material.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] In this invention, the pretreatment box adopts a stepped physical interception method that combines inclined mesh grid and coarse filter components. This method can quickly separate large particulate impurities and trap tiny suspended matter through fine quartz sand filter plates, significantly reducing the load on subsequent treatment units and ensuring long-term stable operation of the reaction box and adsorption tower.

[0021] Inside the reaction chamber, the addition of lime, the assistance of flocculants, and the powerful mixing of the agitator promote the full conversion of fluoride ions into calcium fluoride precipitate. Combined with the precise control of the reaction temperature by the heating tube, the precipitation and crystallization efficiency is effectively improved, the reaction time is shortened, the density of the precipitate is enhanced, and the sludge moisture content is reduced.

[0022] The adsorption tower has multiple layers that form a step-by-step adsorption barrier through gradient-decreasing pores and fluoride-absorbing materials with different adsorption properties. The upper adsorption block initially intercepts high concentrations of fluoride ions, while the lower adsorption block extends the contact time and enhances deep adsorption through dense pores, ensuring that the fluoride concentration in the effluent remains stable and meets the standards.

[0023] The slag discharge ramp of the pretreatment box and the bottom door of the reaction box facilitate quick cleaning of solid waste and sludge. The modular placement layer of the adsorption tower allows for convenient replacement or regeneration of adsorption blocks through fixed hanging ears, which reduces operation and maintenance costs and avoids the impact of downtime on the continuity of treatment. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the device for deep defluorination of fluoride-containing wastewater according to the present invention;

[0025] Figure 2 This is a schematic diagram of the pretreatment tank in the device for deep defluorination of fluoride-containing wastewater described in this utility model;

[0026] Figure 3 This is a schematic diagram of the coarse filter component in the device for deep defluorination of fluoride-containing wastewater described in this utility model;

[0027] Figure 4 This is a schematic diagram of the reaction tank in the device for deep defluorination of fluoride-containing wastewater described in this utility model;

[0028] Figure 5 This is a schematic diagram of the adsorption tower in the device for deep defluorination of fluoride-containing wastewater described in this utility model.

[0029] In the diagram: 1. Pretreatment tank; 2. First water pump; 3. Reaction tank; 4. Second water pump; 5. Adsorption tower; 6. Drainage pump; 11. Inlet pipe; 12. Inclined grid; 13. Coarse filter assembly; 14. Drainage hopper; 15. Water pipe; 16. Slag discharge port; 17. Slag discharge inclined plate; 131. Insert plate; 132. Filter plate; 133. Drainage plate; 31. Motor; 32. Transmission rod; 33. Stirring paddle; 34. Dosing pump; 35. Heating tube; 36. Power supply assembly; 37. Bottom side door; 51. Placement layer; 52. Adsorption block; 53. Through hole; 54. Fixing lug. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will be described below based on its overall structure.

[0032] Reference Figures 1 to 5 In this embodiment of the present invention, a device for deep defluorination of fluoride-containing wastewater includes: a pretreatment tank 1, a reaction tank 3, and an adsorption tower 5. An inlet pipe 11 is fixedly connected to the top cover of the pretreatment tank 1 for inputting fluoride-containing wastewater. An inclined mesh grid 12 is welded to the inner side of the tank near the inlet, with a grid inclination angle of 30 degrees, to intercept large suspended solids such as sand and fibers in the wastewater. A coarse filter assembly 13 is installed below the inclined mesh grid 12. The coarse filter assembly 13 consists of an insert plate 131, a filter plate 132, and a seepage plate 133. The insert plate 131 is welded to the inner wall of the pretreatment tank 1, and the filter plate 132 is fixed to the insert plate 132 via slots. The inner side of plate 131 is filled with fine quartz sand with a particle size of about one millimeter to trap small particles. The permeation plate 133 is located below the filter plate 132, and its surface is evenly distributed with permeation holes with a diameter of about two millimeters, so that the filtered wastewater flows evenly down to the discharge hopper 14. The discharge hopper 14 has an inverted conical structure, and its bottom is connected to a water pipe 15. The water pipe 15 passes through the side wall of the pretreatment tank 1 and is fixedly connected to the inlet end of the first water pump 2. The residue intercepted by the inclined mesh 12 slides down through the slag discharge port 16 to the slag discharge inclined plate 17. The slag discharge inclined plate 17 is welded to the outside of the pretreatment tank 1 with an inclination angle of thirty degrees, which is convenient for manual or mechanical cleaning.

[0033] The reaction chamber 3 is connected to the pretreatment chamber 1 via the first water pump 2. A motor 31 is installed on the top of the reaction chamber 3. The motor 31 drives the transmission rod 32 to rotate via a belt. The bottom end of the transmission rod 32 is fixed with a stirring paddle 33. The diameter of the paddle is one-third of the inner diameter of the reaction chamber 3. A heating tube 35 is embedded in the side wall of the reaction chamber 3. The heating tube 35 is powered by a power supply assembly 36, which is fixed to the top of the reaction chamber 3. A dosing pump 34 is fixed to the top of the reaction chamber 3. Its outlet pipe extends below the liquid surface and is used to quantitatively add flocculant to the wastewater. At the same time, lime particles are pre-laid at the bottom of the reaction chamber 3. The stirring paddle 33 mixes the wastewater, lime and flocculant, promoting the formation of calcium fluoride precipitate by fluoride ions and calcium ions. The mixed liquid after the reaction is lifted to the adsorption tower 5 by the second water pump 4. A filter pipe is added to the connecting pipe between the second water pump 4 and the reaction chamber 3 to intercept small particles that have not settled. A bottom side door 37 is opened at the bottom of the reaction chamber 3. The door is connected to the chamber body by a hinge and is used to periodically clean the settled sludge and add lime.

[0034] The adsorption tower 5 is composed of multiple stacked placement layers 51. Each layer is fixed by fixing lugs 54 and connecting bolts. Each placement layer 51 has through holes 53 at its bottom. The size of the through holes 53 decreases from top to bottom, while the mesh size increases to extend the wastewater retention time. Adsorption blocks 52 are filled inside the placement layers 51 and are made of activated alumina or modified zeolite particles. After the wastewater is pumped into the top of the adsorption tower 5 by the second water pump 4, it flows through each layer of adsorption blocks 52 in sequence. The upper layer of adsorption blocks 52 mainly adsorbs high-concentration residual fluoride ions, while the lower layer of adsorption blocks 52 achieves deep adsorption of low-concentration fluoride ions through dense through holes 53. The adsorption blocks 52 that are saturated can be replaced individually by disassembling the fixing lugs 54 or regenerated by acid washing. The purified wastewater is discharged by the drainage pump 6.

[0035] The working principle of this utility model is as follows:

[0036] Fluorine-containing wastewater enters the pretreatment tank 1 through the inlet pipe 11. First, it passes through the inclined screen 12 to intercept large suspended solids and other impurities. The intercepted residue is discharged through the slag outlet 16 along the slag discharge inclined plate 17. The wastewater then flows downwards and undergoes secondary filtration through the filter plate 132 and permeate plate 133 of the coarse filter assembly 13. The fine quartz sand inside the filter plate 132 further traps small particles. The purified wastewater is collected by the drain hopper 14 and then transported to the reaction tank 3 by the first water pump 2 through the water pipe 15. In the reaction tank 3, the wastewater reacts with lime. The dosing pump 34 adds flocculant to the wastewater. The motor 31 drives the stirring paddle 33 to thoroughly stir the mixture, promoting the combination of fluoride ions and calcium ions to form calcium fluoride precipitate. The heating pipe 35 is powered by the power supply assembly 36. Electricity is used to heat the reaction system to accelerate the precipitation reaction and improve crystallization efficiency. The wastewater that has completed chemical precipitation is pumped to the adsorption tower 5 by the second water pump 4. The wastewater flows from top to bottom through multiple placement layers 51. The size of the through holes 53 in each placement layer 51 decreases step by step. The fluoride adsorption material in the adsorption block 52, such as activated alumina or modified zeolite, performs gradient adsorption of residual fluoride ions. The upper adsorption block 52 intercepts higher concentrations of fluoride ions, while the lower adsorption block 52 achieves deep adsorption through denser through holes 53. Finally, the qualified wastewater is discharged from the system by the drainage pump 6. The calcium fluoride sludge deposited at the bottom of the reaction tank 3 can be cleaned periodically through the bottom side door 37. The saturated adsorption blocks 52 in the adsorption tower 5 can be replaced or regenerated by disassembling the fixing lugs 54, thereby achieving continuous and stable deep defluorination treatment.

[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 device for deep defluorination of fluoride-containing wastewater, characterized in that, include: A pretreatment tank (1) is fixedly connected to the outside of the pretreatment tank (1), a first water pump (2) is fixedly connected to the side of the first water pump (2), a reaction tank (3) is fixedly connected to the side of the reaction tank (3), a second water pump (4) is fixedly connected to the outside of the reaction tank (3), an adsorption tower (5) is fixedly connected to the outlet end of the second water pump (4), and a drainage pump (6) is fixedly connected to the bottom of the adsorption tower (5). The pretreatment tank (1) is used to block and filter particulate impurities in the wastewater; The reaction chamber (3) is used for chemical precipitation of fluoride ions in wastewater; The adsorption tower (5) is used to remove residual fluoride ions from the wastewater.

2. The apparatus for deep defluorination of fluoride-containing wastewater according to claim 1, characterized in that, The pretreatment box (1) includes an inlet pipe (11) fixedly connected to the top cover of the pretreatment box (1). An inclined mesh grid (12) is fixedly welded to the upper inner side of the pretreatment box (1) near the inlet. A coarse filter assembly (13) is fixedly connected below the inclined mesh grid (12). A drain hopper (14) is fixedly connected to the inner side of the pretreatment box (1) near the lower part of the coarse filter assembly (13). A water pipe (15) is fixedly connected to the lower part of the drain hopper (14). The water pipe (15) passes through the side wall of the pretreatment box (1) and is fixedly connected to the first water pump (2). A slag discharge port (16) is opened on the side wall of the pretreatment box (1). A slag discharge inclined plate (17) is fixedly welded to the outer side of the pretreatment box (1) near the lower part of the slag discharge port (16). The coarse filtration assembly (13) includes an insert plate (131) fixedly welded to the inside of the pretreatment box (1), a filter plate (132) fixedly inserted into the inside of the insert plate (131), and a seepage plate (133) fixedly connected below the filter plate (132).

3. The apparatus for deep defluorination of fluoride-containing wastewater according to claim 1, characterized in that, A motor (31) is fixedly connected to the top of the reaction chamber (3). A transmission rod (32) is connected to the side of the motor (31) via a belt drive. A stirring paddle (33) is fixedly connected to the bottom of the transmission rod (32) through the top of the reaction chamber (3). A dosing pump (34) is fixedly connected to the side of the reaction chamber (3) near the transmission rod (32). A heating tube (35) is fixedly connected to the inner side wall of the reaction chamber (3). A power supply assembly (36) is fixedly connected to the top of the reaction chamber (3) near the edge. The power supply assembly (36) has its power transmission end passing through the top of the reaction chamber (3) and electrically connected to the heating tube (35). A bottom door (37) is provided on the side of the reaction chamber (3) near the ground.

4. The apparatus for deep defluorination of fluoride-containing wastewater according to claim 1, characterized in that, The adsorption tower (5) is composed of multiple placement layers (51). The inner side of the placement layer (51) is filled with adsorption blocks (52). The bottom of the placement layer (51) is provided with through holes (53). The outer side of the placement layer (51) is fixedly welded with fixing lugs (54). The fixing lugs (54) are fixedly screwed on the top of the fixing lugs (54).

5. The apparatus for deep defluorination of fluoride-containing wastewater according to claim 2, characterized in that, The position of the slag discharge port (16) corresponds to the position of the inclined grid (12). The slag discharge inclined plate (17) is fixedly connected to the outside of the pretreatment box (1) by a connecting rod. The liquid discharge hopper (14) is located below the liquid seepage plate (133), and the size of the liquid discharge hopper (14) is larger than the area of ​​the liquid seepage plate (133). The filter plate (132) is filled with fine quartz sand.

6. The apparatus for deep defluorination of fluoride-containing wastewater according to claim 3, characterized in that, The dosing pump (34) is filled with flocculant, the bottom of the inner side of the reaction tank (3) is lined with lime, the bottom door (37) is used to clean the sediment and replace the lime, and a filter pipe is fixedly connected to the connection between the second water pump (4) and the reaction tank (3).

7. The apparatus for deep defluorination of fluoride-containing wastewater according to claim 4, characterized in that, Multiple sets of placement layers (51) are fixedly connected by the fixed hooks (54). The through holes (53) of the multiple sets of placement layers (51) from top to bottom have progressively smaller sizes and larger mesh counts. The adsorption block (52) is filled with fluorine-absorbing material.

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