Treatment device for water containing hydrofluoric acid and treatment method for water containing hydrofluoric acid

Abstract

The present invention relates to the technical field of wastewater treatment, and discloses a device for treating hydrofluoric acid-containing water and a method for treating hydrofluoric acid-containing water. The device comprises a grit chamber for pre-treating wastewater, wherein one side of the grit chamber is connected to a bioreactor via a pipeline, and one side of the bioreactor is provided with a collection tank. The collection tank is provided with an adsorption cylinder, and the inner cavity of the adsorption cylinder is provided with a filter assembly for treating fluoride ions in the wastewater. The bottom of the filter assembly is provided with a self-cleaning assembly for cleaning the filter assembly. The device effectively solves the problem that current devices for treating hydrofluoric acid-containing water use a pH neutralization combined with a calcium salt precipitation process, resulting in limited treatment effects and high costs.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a treatment device and a treatment method for hydrofluoric acid-containing water. Background Art

[0002] In the chemical, electroplating, electronics and other industries, hydrofluoric acid is widely used in etching, cleaning and other processes. These processes produce a large amount of wastewater containing hydrofluoric acid. This wastewater is highly corrosive and toxic, posing a serious threat to the environment and human health. It needs to be strictly removed and meet the standards before it can be discharged into natural water bodies.

[0003] Currently, the treatment of hydrofluoric acid wastewater primarily involves pH neutralization combined with calcium salt precipitation. This involves adding a precipitant, such as calcium salt (e.g., lime), to the hydrofluoric acid wastewater, causing fluoride ions to combine with calcium ions to form calcium fluoride precipitate, thereby removing the fluoride ions. This method typically only removes fluoride ions to a concentration of around 10 mg / L. To maximize fluoride precipitation, an excess of calcium salt and an alkali for pH adjustment must be added. Furthermore, when the wastewater quality fluctuates significantly, the dosage of the reagent must be adjusted in real time, further increasing the cost of use. Summary of the Invention

[0004] Technical problems solved

[0005] In response to the above-mentioned shortcomings of the prior art, the present invention provides a treatment device for hydrofluoric acid water and a treatment method for hydrofluoric acid water, which can effectively solve the problem that the current treatment device for hydrofluoric acid water uses a pH neutralization combined with a calcium salt precipitation process, has limited treatment effect and high cost.

[0006] Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] In one aspect of the present application, a treatment device for hydrofluoric acid-containing water is provided, comprising a grit chamber for pre-treating wastewater, characterized in that one side of the grit chamber is connected to a bioreactor via a pipeline, one side of the bioreactor is provided with a collection tank, an adsorption cylinder is provided in the collection tank, the inner cavity of the adsorption cylinder is provided with a filter assembly for treating fluoride ions in the wastewater, and the bottom of the filter assembly is provided with a self-cleaning assembly for cleaning the filter assembly;

[0009] The filter assembly includes a support plate fixedly mounted on the inner side of the adsorption cylinder, and the support plate is provided with filter holes, the support plate is filled with adsorbent, and a filter sponge is provided at the bottom of the support plate;

[0010] The adsorbent is composed of activated carbon-loaded nano-magnesium-aluminum hydrotalcite, and the pore size of the filter pores is smaller than the diameter of the adsorbent particles.

[0011] Furthermore, a water pump is installed on the pipeline between the grit chamber and the biological reaction tank, and a stirring mechanism is installed on the biological reaction tank.

[0012] Furthermore, a three-way pipe is fixedly installed on the top of the collection tank, the output port of the three-way pipe extends to the inner cavity of the adsorption cylinder, and one of the input ports of the three-way pipe is connected to the bioreactor tank through a pipeline.

[0013] Furthermore, the self-cleaning component includes a fixed cylinder installed on the inner side of the adsorption cylinder, and the fixed cylinder is located at the bottom of the support plate. A conical groove is provided on the top of the fixed cylinder, and the filter sponge is adapted to the shape of the conical groove. A water inlet groove is provided at the bottom of the conical groove, and a long plate is fixedly installed in the water inlet groove.

[0014] Furthermore, the long board is in an "n" shape as a whole, and a mounting column for fixing the filter sponge is provided on the top of the long board. A suction tube is provided on the inner side of the long board, and the outer wall of the suction tube is rotatably connected to the wall of the fixed cylinder through a bearing, and the bottom end of the suction tube extends to the bottom of the fixed cylinder.

[0015] Furthermore, an Archimedes screw is rotatably mounted on the inner wall of the long plate through a bearing, and the Archimedes screw is located on the inner side of the suction tube. The outer wall of the Archimedes screw is fixedly connected to the inner wall of the suction tube through a connecting rod.

[0016] Furthermore, squeezing blocks are provided on both sides of the filter sponge, the bottom of the squeezing block is integrally formed and connected with an L-shaped rod, and a horizontal sliding groove for the L-shaped rod to move is provided on the wall of the fixed cylinder.

[0017] Furthermore, the two L-shaped rods are symmetrically arranged, a rotating rod is fixedly sleeved on the outer wall of the suction pipe, and connecting rods are rotatably installed between the two ends of the rotating rod and the outer wall of the L-shaped rod.

[0018] Furthermore, the other input port of the three-way pipe is connected to the sodium hydroxide solution inlet pipe through a pipeline, a drain valve is installed at the bottom of the collection tank, and a drain port is opened at the bottom of the adsorption cylinder.

[0019] Furthermore, the present application also provides a method for treating hydrofluoric acid-containing water, comprising the following steps:

[0020] S1, the hydrofluoric acid-containing wastewater first enters the grit chamber to precipitate sand to pre-treat and remove large particles of suspended matter and debris, initially reducing the turbidity of the wastewater. The pump is controlled to transfer the pre-treated wastewater in the grit chamber into the bioreactor in batches, while the pH value of the wastewater is monitored in real time;

[0021] S2, inoculating a microbial community with tolerance and metabolic capacity for fluoride in a bioreactor, controlling the temperature of the bioreactor to 25-30°C, and the dissolved oxygen content to 2-4 mg / L, using a stirring mechanism to ensure full contact between the wastewater and the microorganisms, and adding calcium chloride or calcium hydroxide as a precipitant to the bioreactor to allow fluoride ions to react with calcium ions to form calcium fluoride precipitate;

[0022] S3, the precipitated wastewater is introduced into a collection tank, and the wastewater passes through an adsorbent and a filter sponge to further remove residual fluoride ions and impurities in the wastewater, thereby obtaining a fluorine-containing waste liquid that meets the emission standards. When the adsorbent reaches adsorption saturation, it is regenerated with a sodium hydroxide solution to desorb the adsorbed fluoride ions.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention passes wastewater through an adsorption cylinder filled with the adsorbent to further remove residual fluoride ions in the wastewater, and when the adsorbent reaches adsorption saturation, sodium hydroxide solution is used to regenerate the adsorbent to desorb the adsorbed fluoride ions. At the same time, the adsorbent can be reused, thereby reducing treatment costs. A filter sponge is provided to prevent adsorbent particles from flowing out with water, thereby ensuring smooth water discharge and preventing water accumulation in the adsorption cylinder from affecting the adsorption effect. The filter sponge is squeezed and self-cleaned using the siphon principle, without the need to use other power sources, thereby further reducing treatment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0026] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of a partially cutaway three-dimensional structure of an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the cross-sectional plan structure of the adsorption cylinder according to an embodiment of the present invention;

[0029] Figure 4 This is a schematic structural diagram of a filter sponge according to an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of a sectional three-dimensional structure of a fixing cylinder according to an embodiment of the present invention;

[0031] Figure 6 This is a schematic structural diagram of a rotating rod according to an embodiment of the present invention;

[0032] Figure 7 Schematic diagram of the structure of the connecting rod according to an embodiment of the present invention.

[0033] The numbers in the figure represent: 1. Grit chamber; 2. Biological reactor; 3. Collection tank; 4. Adsorption cylinder; 5. Filter assembly; 51. Support plate; 52. Filter hole; 53. Adsorbent; 54. Filter sponge; 6. Self-cleaning assembly; 61. Fixed cylinder; 62. Water inlet trough; 63. Long plate; 64. Suction pipe; 65. Archimedes screw; 66. Connecting rod; 67. Extrusion block; 68. L-shaped rod; 69. Horizontal slide; 610. Rotating rod; 611. Connecting rod; 7. Water pump; 8. Stirring mechanism; 9. Tee pipe; 10. Sodium hydroxide solution inlet pipe. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] The present invention will be further described below with reference to the embodiments.

[0036] Example 1, reference Figure 1-Figure 3 , which is the first embodiment of the present invention, provides a treatment device for hydrofluoric acid water, including a grit chamber 1 for pre-treating wastewater, a filter grid fixedly installed in the grit chamber 1, one side of the grit chamber 1 is connected to a bioreactor 2 through a pipeline, a collection tank 3 is provided on one side of the bioreactor 2, an adsorption cylinder 4 is provided in the collection tank 3, a filter assembly 5 for treating fluoride ions in wastewater is provided in the inner cavity of the adsorption cylinder 4, and a self-cleaning assembly 6 for cleaning the filter assembly 5 is provided at the bottom of the filter assembly 5.

[0037] The filter assembly 5 includes a support plate 51 fixedly mounted on the inner side of the adsorption cylinder 4, and a filter hole 52 is opened on the support plate 51, and the support plate 51 is filled with an adsorbent 53; a layer of pebbles or ceramic balls about 2-5 cm thick can be laid on the support plate 51 as a cushion layer to further support the adsorbent 53 and help to evenly distribute the wastewater into the adsorption layer. A filter sponge 54 is provided at the bottom of the support plate 51; the adsorbent 53 is composed of activated carbon-loaded nano-magnesium-aluminum hydrotalcite, and the pore size of the filter hole 52 is smaller than the particle diameter of the adsorbent 53 to prevent the adsorbent 53 from leaking.

[0038] Specifically, a pH sensor may be installed in the bioreactor 2 to monitor the pH value of the wastewater in real time, providing basic data for subsequent treatment. This is an existing technology and will not be elaborated on here.

[0039] Reference Figure 1 、 Figure 2 A water pump 7 is installed on the pipeline between the grit chamber 1 and the biological reactor 2, and a stirring mechanism 8 is installed on the biological reactor 2; a tee pipe 9 is fixedly installed on the top of the collection tank 3, the output port of the tee pipe 9 extends to the inner cavity of the adsorption cylinder 4, and one of the input ports of the tee pipe 9 is connected to the biological reactor 2 through a pipeline.

[0040] Specifically, the stirring mechanism 8 can be a turbine agitator, which is generally composed of multiple blades. Its powerful stirring action can better disperse the air in the wastewater, improve the transfer efficiency of dissolved oxygen, and meet the needs of microbial growth and metabolism. When treating hydrofluoric acid wastewater, stainless steel can be used and subjected to special anti-corrosion treatment, or corrosion-resistant alloy materials can be directly selected to make the turbine agitator.

[0041] Specifically, the hydrofluoric acid-containing wastewater first passes through a screen to remove large particles of suspended solids and debris, and then enters a grit chamber to allow heavier sand particles to settle. Subsequently, a pump 7 is controlled to transfer the pretreated wastewater in the grit chamber 1 into a bioreactor 2 in batches, where it is inoculated with a microbial community that is tolerant to and capable of metabolizing fluorine. The microorganisms remove approximately 30%-50% of the fluoride ions in the wastewater, while also decomposing some organic matter and reducing the chemical oxygen demand (COD) of the wastewater. Subsequently, calcium chloride or calcium hydroxide is added to the bioreactor 2 as a precipitant. The dosage of the precipitant is precisely calculated based on the fluoride ion concentration and pH value of the wastewater, so that the fluoride ions react with the calcium ions to form calcium fluoride precipitate.

[0042] Specifically, the microbial community contains fluoride-eroding bacteria whose main components are any one of the genera Pseudomonas, Bacillus, Actinomycetes or Sulfide-Reducing Bacteria, which can remove fluoride ions by adsorption, biotransformation or bioflocculation and precipitation. At the same time, the enzymes in the cells participate in the metabolic process of fluoride, converting fluoride into relatively harmless substances.

[0043] Specifically, activated carbon has a rich pore structure and a high specific surface area. Activated carbon provides a broader attachment platform for magnesium-aluminum hydrotalcite, enabling it to be more evenly dispersed and increasing the contact area with the wastewater. In addition, activated carbon can adsorb some fluoride ions in the wastewater through physical adsorption. At the same time, its good adsorption performance can also adsorb some organic impurities and other interfering substances in the wastewater, reducing the impact of these substances on the ion exchange and fluoride ion adsorption process of magnesium-aluminum hydrotalcite. The presence of activated carbon enhances the mechanical strength of the entire adsorbent 53, making it less likely to break and pulverize during water flow impact and adsorption-desorption cycles, thereby ensuring the stability and service life of the adsorbent 53. The biologically treated wastewater is passed into the collection tank 3. Exchangeable anions (carbonate ions, etc.) exist in the crystal structure of magnesium-aluminum hydrotalcite. When the fluoride-containing wastewater passes through the adsorbent 53, fluoride ions undergo ion exchange reactions with anions between the magnesium-aluminum hydrotalcite layers. For example, carbonate ions between layers can exchange with fluoride ions, thereby fixing the fluoride ions in the hydrotalcite structure. At the same time, the large specific surface area of ​​magnesium-aluminum hydrotalcite provides a large number of active sites on its surface, where fluoride ions can be adsorbed through electrostatic adsorption. These two effects work together to effectively remove fluoride ions from wastewater.

[0044] Example 2, reference Figure 1-Figure 7 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the self-cleaning component 6 includes a fixed cylinder 61 installed on the inner side of the adsorption cylinder 4, and the fixed cylinder 61 is located at the bottom of the support plate 51, and a conical groove is provided on the top of the fixed cylinder 61. The filter sponge 54 is adapted to the shape of the conical groove, and a water inlet groove 62 is provided at the bottom of the conical groove. A long plate 63 is fixedly installed in the water inlet groove 62; the long plate 63 is in an "n" shape as a whole, and a mounting column for fixing the filter sponge 54 is detachably installed on the top of the long plate 63.

[0045] Specifically, the three-way pipe 9 is set on the top or side of the adsorbent 53. If it is on the top, several downward-sloping water outlets can be opened along the circumferential surface of the output port of the three-way pipe 9, or a spray-type water inlet structure can be adopted. The wastewater is evenly sprayed on the surface of the adsorbent 53 through a nozzle with multiple small holes to ensure that the wastewater can fully cover the adsorbent 53 and fully contact it for adsorption reaction; if water is inletted from the side, a water distributor is required to make the wastewater evenly enter the adsorption cylinder 4 along the circumferential direction. The diameter of the water inlet pipe is determined according to the wastewater flow rate. Generally, the wastewater flow rate is controlled at 0.5-1.5 m / s to ensure that the wastewater and the adsorbent 53 have a suitable contact time.

[0046] Specifically, the wastewater passes through the adsorbent 53 and then flows through the filter hole 52 to the filter sponge 54, which further purifies the wastewater and prevents the adsorbent 53 particles from flowing out with the water, ensuring smooth water outflow and avoiding water accumulation in the adsorption cylinder 4 affecting the adsorption effect.

[0047] Reference Figure 3 、 Figure 5 A suction tube 64 is installed on the inner side of the long plate 63, and the outer wall of the suction tube 64 is rotatably connected to the wall of the fixed cylinder 61 through a bearing, and the bottom end of the suction tube 64 extends to the bottom of the fixed cylinder 61; an Archimedes screw 65 is rotatably installed on the inner wall of the long plate 63 through a bearing, and the Archimedes screw 65 is located on the inner side of the suction tube 64, and the outer wall of the Archimedes screw 65 and the inner wall of the suction tube 64 are fixedly connected by a connecting rod 66.

[0048] Specifically, when the water received in the fixed cylinder 61 rises to above the top surface of the suction tube 64 (i.e., the preset line), (similar to the principle of filling wine in a fair cup), the pressure difference is used to draw the water into the suction tube 64, and the potential energy of the water impacts the Archimedes screw 65. Under the connecting action of the connecting rod 66, the impact of the water causes the Archimedes screw 65 to rotate, driving the suction tube 64 to rotate synchronously, generating an axial rotation force centered on the axis of the suction tube 64, without the need to use other power sources.

[0049] Reference Figure 3 、 Figure 5 and Figure 6 , extrusion blocks 67 are provided on both sides of the filter sponge 54, and the bottom of the extrusion block 67 is integrally connected with an L-shaped rod 68, and a horizontal slide groove 69 for the L-shaped rod 68 to move is provided on the wall of the fixed cylinder 61; the two L-shaped rods 68 are symmetrically arranged, and a rotating rod 610 is fixedly sleeved on the outer wall of the suction tube 64, and a connecting rod 611 is rotatably installed between the two ends of the rotating rod 610 and the outer wall of the L-shaped rod 68.

[0050] During the wastewater treatment process, the filter sponge 54 continuously intercepts impurities in the wastewater and a small amount of adsorbent 53 particles that may flow out with the water. Over time, the filter sponge 54 will gradually become clogged, resulting in increased water flow resistance, affecting the smoothness of water flow and the overall treatment efficiency of the adsorption cylinder 4. This squeezing action can squeeze out impurities and moisture trapped in the filter sponge 54, achieving preliminary cleaning of the filter sponge 54. The squeezed impurities will flow into the bottom of the fixed cylinder 61 with the water flow and be discharged through the suction pipe 64, allowing the filter sponge 54 to restore some of its filtering performance, which is equivalent to regenerating it, extending the service life of the filter sponge 54, and reducing the cost and workload of frequently replacing the filter sponge 54.

[0051] Specifically, when the Archimedean screw 65 drives the suction pipe 64 to rotate axially with the axis as the center, under the limiting action of the horizontal slide 69, the rotating rod 610 rotates synchronously with the suction pipe 64, and pulls the L-shaped rod 68 through the connecting rods 611 on both sides, so that the L-shaped rods 68 on both sides are close to the suction pipe 64. In this way, the filter sponge 54 on the top of the L-shaped rod 68 exerts pressure and squeezes it, thereby assisting the filter sponge 54 in draining water. In addition, the squeezing action of the squeezing block 67 on the filter sponge 54 can change the pore structure inside the filter sponge 54. During the squeezing process, some pores of the filter sponge 54 will be compressed and become smaller, while the pores of other parts will expand relatively. When the wastewater passes through the filter sponge 54 again, this uneven pore structure can cause the wastewater to be more evenly distributed in various parts of the filter sponge 54. The rest of the structure is the same as that of Example 1.

[0052] Example 3, reference Figure 1-Figure 7 , which is the third embodiment of the present invention. This embodiment differs from the second embodiment in that: the other input port of the tee pipe 9 is connected to the sodium hydroxide solution inlet pipe 10 through a pipeline, and the pipeline connected to the top of the tee pipe 9 is installed with a solenoid valve (shown in the figure but not numbered), a drain valve is installed at the bottom of the collection tank 3, and a drain port is opened at the bottom of the adsorption cylinder 4.

[0053] Specifically, the drain port of the adsorption cylinder 4 is usually located at its bottom and can be shared with the water outlet. During the regeneration process, the drain valve at the bottom of the collection tank 3 is opened to discharge the desorbed fluoride ions and regeneration liquid. In order to facilitate the monitoring of the regeneration effect and the control of the regeneration process, a fluoride ion concentration detector and a flow meter can be installed on the drain valve to monitor the fluoride ion concentration and flow in the discharged liquid in real time.

[0054] Specifically, when adsorbent 53 reaches adsorption saturation, the solenoid valve connecting the bioreactor 2 is closed, and the solenoid valve connecting the sodium hydroxide solution inlet pipe 10 is opened. The sodium hydroxide solution is introduced into the adsorption cylinder 4 through the tee pipe 9 to regenerate adsorbent 53 and desorb the adsorbed fluoride ions. When the fluoride ion concentration in the effluent decreases to a level close to the background fluoride ion concentration of the initial sodium hydroxide solution, regeneration is considered to be substantially complete. Thereafter, the solenoid valve connecting the sodium hydroxide solution inlet pipe 10 is closed, and the solenoid valve connecting the bioreactor 2 is opened, resuming the wastewater treatment process. The remaining structure is the same as that of Example 2.

[0055] Example 4, reference Figure 1-Figure 7 , which is a fourth embodiment of the present invention, provides a method for treating hydrofluoric acid-containing water, comprising the following steps:

[0056] S1, the hydrofluoric acid-containing wastewater first enters the grit chamber 1 to precipitate sand particles to pre-treat and remove large particles of suspended matter and debris, initially reducing the turbidity of the wastewater. The pump 7 is controlled to transfer the pre-treated wastewater in the grit chamber 1 into the bioreactor 2 in batches, while the pH value of the wastewater is monitored in real time.

[0057] S2. In bioreactor 2, a microbial community with tolerance and metabolic capacity for fluoride is inoculated. The temperature of bioreactor 2 is controlled at 25-30°C, and the dissolved oxygen content is controlled at 2-4 mg / L. A stirring mechanism 8 is used to ensure full contact between the wastewater and the microorganisms. Calcium chloride or calcium hydroxide is added to bioreactor 2 as a precipitant to cause fluoride ions to react with calcium ions to form calcium fluoride precipitate.

[0058] S3, the precipitated wastewater is introduced into the collection tank 3, and the wastewater passes through the adsorbent 53 and the filter sponge 54 to further remove the residual fluoride ions and impurities in the wastewater, thereby obtaining a fluorine-containing waste liquid that meets the discharge standards. When the adsorbent 53 reaches adsorption saturation, it is regenerated with sodium hydroxide solution to desorb the adsorbed fluoride ions.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A treatment device for hydrofluoric acid-containing water, comprising a grit chamber (1) for pre-treating wastewater, characterized in that: One side of the grit chamber (1) is connected to a bioreactor (2) via a pipeline, a collecting tank (3) is provided on one side of the bioreactor (2), an adsorption cylinder (4) is provided in the collecting tank (3), a filter assembly (5) for treating fluoride ions in wastewater is provided in the inner cavity of the adsorption cylinder (4), and a self-cleaning assembly (6) for cleaning the filter assembly (5) is provided at the bottom of the filter assembly (5); The filter assembly (5) comprises a support plate (51) fixedly mounted on the inner side of the adsorption cylinder (4), and a filter hole (52) is provided on the support plate (51). The support plate (51) is filled with an adsorbent (53), and a filter sponge (54) is provided at the bottom of the support plate (51); The adsorbent (53) is composed of activated carbon-loaded nano-magnesium-aluminum hydrotalcite, and the pore size of the filter pore (52) is smaller than the particle diameter of the adsorbent (53); The self-cleaning assembly (6) comprises a fixed cylinder (61) mounted on the inner side of the adsorption cylinder (4), and the fixed cylinder (61) is located at the bottom of the support plate (51); a conical groove is provided on the top of the fixed cylinder (61); the filter sponge (54) is adapted to the shape of the conical groove; a water inlet groove (62) is provided at the bottom of the conical groove; a long plate (63) is fixedly installed in the water inlet groove (62); The long plate (63) is in an "n" shape as a whole. A mounting column for fixing the filter sponge (54) is provided on the top of the long plate (63). A suction pipe (64) is provided on the inner side of the long plate (63). The outer wall of the suction pipe (64) is rotatably connected to the wall of the fixed cylinder (61) through a bearing. The bottom end of the suction pipe (64) extends to the bottom of the fixed cylinder (61). An Archimedes screw (65) is rotatably mounted on the inner wall of the long plate (63) via a bearing, and the Archimedes screw (65) is located on the inner side of the suction tube (64). The outer wall of the Archimedes screw (65) and the inner wall of the suction tube (64) are fixedly connected via a connecting rod (66); Both sides of the filter sponge (54) are provided with extrusion blocks (67), the bottom of the extrusion blocks (67) is integrally formed and connected with an L-shaped rod (68), and a horizontal sliding groove (69) for the L-shaped rod (68) to move is provided on the wall of the fixed cylinder (61); The two L-shaped rods (68) are symmetrically arranged, a rotating rod (610) is fixedly sleeved on the outer wall of the suction pipe (64), and connecting rods (611) are rotatably installed between the two ends of the rotating rod (610) and the outer wall of the L-shaped rod (68).

2. The treatment device for hydrofluoric acid-containing water according to claim 1, characterized in that: A water pump (7) is installed on the pipeline between the grit chamber (1) and the biological reaction tank (2), and a stirring mechanism (8) is installed on the biological reaction tank (2).

3. The treatment device for hydrofluoric acid-containing water according to claim 2, characterized in that: A three-way pipe (9) is fixedly installed on the top of the collection tank (3), the output port of the three-way pipe (9) extends to the inner cavity of the adsorption cylinder (4), and one of the input ports of the three-way pipe (9) is connected to the bioreactor tank (2) through a pipeline.

4. The treatment device for hydrofluoric acid-containing water according to claim 3, characterized in that: The other input port of the three-way pipe (9) is connected to the sodium hydroxide solution inlet pipe (10) through a pipeline. A drain valve is installed at the bottom of the collection tank (3), and a drain port is opened at the bottom of the adsorption cylinder (4).

5. A method for treating water containing hydrofluoric acid, which is applied to the device for treating water containing hydrofluoric acid according to claim 4, characterized in that: The following steps are involved: S1, the wastewater containing hydrofluoric acid first enters the grit chamber (1), and the sand is precipitated to pre-treat and remove large particles of suspended solids and debris, thereby preliminarily reducing the turbidity of the wastewater. The pump (7) is controlled to transfer the pre-treated wastewater in the grit chamber (1) into the bioreactor (2) in batches; S2, inoculating a microbial community that has tolerance and metabolic capacity for fluorine in a bioreactor (2), controlling the temperature of the bioreactor (2) to 25-30°C, controlling the dissolved oxygen content to 2-4 mg / L, allowing the wastewater to fully contact the microorganisms through a stirring mechanism (8), and adding calcium chloride or calcium hydroxide as a precipitant into the bioreactor (2) to react fluoride ions with calcium ions to form calcium fluoride precipitate; S3, the precipitated wastewater is introduced into a collection tank (3), and the wastewater passes through an adsorbent (53) and a filter sponge (54) to further remove residual fluoride ions and impurities in the wastewater, thereby obtaining a fluorine-containing waste liquid that meets the discharge standard. When the adsorbent (53) reaches adsorption saturation, it is regenerated with a sodium hydroxide solution to desorb the adsorbed fluoride ions.

Images