Fluorine-containing wastewater treatment system and treatment method

Abstract

The invention discloses a fluorine-containing wastewater treatment system and method, and relates to the technical field of wastewater treatment.The fluorine-containing wastewater treatment system comprises a liquid storage tank, a reaction tank, a controller, a detector and a valve, the liquid storage tank is used for storing treatment liquid medicine, the reaction tank is used for storing fluorine-containing wastewater, and the liquid storage tank and the reaction tank are communicated through a dosing pipeline; the detector is arranged in the reaction tank and used for acquiring the concentration of fluorine ions in the reaction tank, the valve is arranged on the dosing pipeline, the controller is connected with the detector and the valve, and the controller is used for controlling the valve to execute opening and closing actions according to the concentration of fluorine ions acquired by the detector. According to the fluorine-containing wastewater treatment system and treatment method, the controller controls the opening and closing of the dosing pipeline valve in real time according to the fluorine ion concentration obtained by the detector, the change of the fluorine ion concentration in the fluorine-containing wastewater can be dynamically adapted, the standard reaching of the fluorine ions in the effluent is effectively ensured, and excessive waste of chemicals and increase of the sludge treatment cost are avoided.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and more specifically, to a treatment system and method for fluoride-containing wastewater. Background Technology

[0002] Fluoride-containing wastewater is widely produced in industries such as electronics manufacturing, metallurgy, and fluorochemicals. Direct discharge will pollute soil and water bodies and may also affect human health through the food chain. It must be treated to ensure that the concentration of fluoride ions meets the standards before it can be discharged. At present, the chemical precipitation method of adding calcium salts such as calcium chloride is often used in industry to remove fluoride ions. The principle of forming insoluble calcium fluoride precipitate by calcium ions and fluoride ions is used to treat wastewater.

[0003] Existing fluoride-containing wastewater treatment systems have significant shortcomings in the reagent dosing process: either they rely on manual periodic monitoring of fluoride ion concentration and manual adjustment of the dosage, resulting in data lag and potential for exceeding effluent standards or reagent waste due to untimely adjustments; or they adopt a fixed dosage mode, which cannot adapt to the dynamic changes in wastewater fluoride ion concentration. When the concentration rises, the treatment fails to meet standards, while when the concentration falls, excessive reagent consumption and the generation of large amounts of sludge increase, increasing disposal costs. It is difficult to balance the needs of achieving compliant discharge and cost control. Summary of the Invention

[0004] The purpose of this application is to provide a treatment system and method for fluoride-containing wastewater. The system uses a controller to control the opening and closing of the dosing pipeline valves in real time based on the fluoride ion concentration obtained from the detector. This allows for dynamic adaptation to changes in the fluoride ion concentration in the fluoride-containing wastewater, effectively ensuring that the effluent fluoride ion concentration meets the standards, while avoiding excessive waste of reagents and increased sludge disposal costs.

[0005] The embodiments of this application are implemented as follows: A first aspect of this application provides a treatment system for fluoride-containing wastewater, including a storage tank, a reaction tank, a controller, a detector, and a valve. The storage tank is used to store treatment solutions, and the reaction tank is used to store fluoride-containing wastewater. The storage tank and the reaction tank are connected via a dosing pipeline. The detector is installed in the reaction tank to obtain the fluoride ion concentration in the reaction tank. The valve is installed on the dosing pipeline. The controller is connected to the detector and the valve, and the controller is used to control the valve to perform opening and closing actions based on the fluoride ion concentration obtained by the detector.

[0006] In one possible implementation, the controller is configured with multiple preset fluoride ion concentration levels and corresponding first durations for the valve to open and second durations for the valve to close. The controller is used to determine the target fluoride ion concentration level based on the fluoride ion concentration obtained by the detector, and to control the valve to periodically perform opening and closing actions according to the first and second durations corresponding to the target fluoride ion concentration level.

[0007] In one possible implementation, the reaction tank includes a first sub-reaction tank and a second sub-reaction tank, with the inlet pipe, the first sub-reaction tank, and the second sub-reaction tank connected in sequence, the dosing pipe connected to the second sub-reaction tank, and the detector located in the first sub-reaction tank to obtain the fluoride ion concentration in the first sub-reaction tank.

[0008] As one possible implementation, a return pipeline is also included. The inlet end of the return pipeline is connected to the outlet end of the dosing pipeline near the valve, and the outlet end of the return pipeline is connected to the storage tank. When the valve performs a closing action, the treatment solution in the dosing pipeline can flow back to the storage tank via the return pipeline.

[0009] As one possible implementation, the return pipeline is provided with an anti-backflow structure on the side near the outlet end of the dosing pipeline.

[0010] As one possible implementation, the return pipeline is made of EPDM rubber, and / or the valve is made of unplasticized PVC or EPDM rubber.

[0011] As one possible implementation, a dosing pump is also included, which is disposed on the dosing pipeline and is used to introduce the treatment solution in the storage tank into the reaction tank through the dosing pipeline.

[0012] In one possible implementation, the dosing pump is located on the side of the dosing pipeline closer to the storage tank, and the valve is located on the side of the dosing pipeline closer to the reaction tank.

[0013] As one possible implementation, the detector is a fluorine meter, and / or the valve is a pneumatic valve.

[0014] A second aspect of this application provides a method for treating fluoride-containing wastewater, which uses the fluoride-containing wastewater treatment system described above to treat the fluoride-containing wastewater.

[0015] The beneficial effects of the embodiments of this application include: The fluoride-containing wastewater treatment system includes a storage tank, a reaction tank, a controller, detectors, and valves. The storage tank stores the treatment solution, and the reaction tank stores the fluoride-containing wastewater. The storage tank and the reaction tank are connected via a dosing pipeline. A detector is installed in the reaction tank to obtain the fluoride ion concentration. Valves are installed on the dosing pipeline. The controller is connected to the detector and valves, and controls the valves to open and close based on the fluoride ion concentration data obtained from the detector. The detector obtains the fluoride ion concentration of the fluoride-containing wastewater in the reaction tank in real time, and the controller precisely controls the opening and closing of the valves on the dosing pipeline based on the real-time concentration data. When the fluoride ion concentration increases, the dosage of the treatment solution can be increased in a timely manner to ensure that calcium ions and fluoride ions react fully to form calcium fluoride precipitate, effectively preventing the fluoride ion concentration in the effluent from exceeding the standard. When the fluoride ion concentration decreases, the dosage of the treatment solution can be reduced or suspended. This avoids the waste of treatment solutions such as calcium chloride, reduces costs, and also reduces the calcium fluoride sludge generated by excessive treatment solutions, thereby reducing the cost of subsequent sludge dewatering, transportation, and disposal. At the same time, it eliminates the need for frequent manual sampling and testing and manual valve adjustment, ensuring that the treatment effect meets the standards while taking into account both operational convenience and economic efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is one of the structural schematic diagrams of the fluoride-containing wastewater treatment system provided in the embodiments of this application; Figure 2 This is a second schematic diagram of the structure of the fluoride-containing wastewater treatment system provided in the embodiments of this application.

[0018] Icons: 10-Storage tank; 21-First sub-reaction tank; 22-Second sub-reaction tank; 30-Controller; 40-Detector; 50-Valve; 60-Dosing line; 70-Return line; 80-Dosing pump. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of this application, not all embodiments. Similar reference numerals and letters in the following drawings indicate similar items. Once an item is defined in one drawing, it does not need to be further defined in other drawings.

[0020] The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and should not be construed as limiting this application. The terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] Unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to connections within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] Currently, most industrial wastewater treatment processes remove fluoride ions through chemical precipitation by adding calcium salts such as calcium chloride to fluoride-containing wastewater. This method utilizes the principle that calcium ions react with fluoride ions to form insoluble calcium fluoride precipitate. However, existing fluoride-containing wastewater treatment systems have significant drawbacks in the chemical dosing stage: either they rely on manual periodic monitoring of fluoride ion concentration and manual adjustment of the dosage, resulting in data lag and potential for exceeding effluent standards or wasting chemicals due to untimely adjustments; or they employ a fixed dosage mode, which cannot adapt to dynamic changes in fluoride ion concentration. When the concentration rises, treatment fails to meet standards, while when the concentration decreases, excessive chemical consumption and the generation of large amounts of sludge increase, increasing disposal costs. It is difficult to balance the requirements of achieving compliant discharge with cost control.

[0023] To solve the above problems, please refer to the following: Figure 1 and Figure 2 This application provides a treatment system and method for fluoride-containing wastewater. A detector 40 acquires the fluoride ion concentration of the wastewater in the reaction tank in real time, and a controller 30 precisely controls the opening and closing of the valve 50 on the dosing pipeline 60 based on the real-time concentration data. When the fluoride ion concentration increases, the dosage of the treatment solution can be increased in a timely manner to ensure that calcium ions and fluoride ions react fully to form calcium fluoride precipitate, effectively preventing the fluoride ion concentration in the effluent from exceeding the standard. When the fluoride ion concentration decreases, the dosage of the treatment solution is reduced or suspended, which avoids waste of treatment solutions such as calcium chloride, reduces costs, and reduces the calcium fluoride sludge generated by excessive treatment solutions, thereby reducing the cost of subsequent sludge dewatering, transportation, and disposal. Furthermore, it eliminates the need for frequent manual sampling and testing and manual adjustment of the valve 50, ensuring both operational convenience and economic efficiency while ensuring the treatment effect meets standards.

[0024] Specifically, such as Figure 1 and Figure 2As shown, in a first aspect of this application, a system for treating fluoride-containing wastewater is provided, including a storage tank 10, a reaction tank, a controller 30, a detector 40, and a valve 50. The storage tank 10 is used to store treatment solution, and the reaction tank is used to store fluoride-containing wastewater. The storage tank 10 and the reaction tank are connected through a dosing pipeline 60. The detector 40 is installed in the reaction tank to obtain the fluoride ion concentration in the reaction tank. The valve 50 is installed on the dosing pipeline 60. The controller 30 is connected to the detector 40 and the valve 50, and the controller 30 is used to control the valve 50 to perform opening and closing actions according to the fluoride ion concentration obtained by the detector 40.

[0025] It should be noted that the fluoride-containing wastewater treatment system includes a storage tank 10 and a reaction tank. The storage tank 10 is used to store treatment solutions (such as calcium chloride), and the reaction tank is used to store fluoride-containing wastewater. The storage tank 10 and the reaction tank are connected by a dosing pipeline 60. Specifically, the inlet end of the dosing pipeline 60 is connected to the storage tank 10, and the outlet end of the dosing pipeline 60 is connected to the reaction tank. In this way, the treatment solution stored in the storage tank 10 can be introduced into the reaction tank through the dosing pipeline 60 to chemically react with the fluoride-containing wastewater in the reaction tank to precipitate it, thereby achieving the purpose of wastewater treatment and reducing the concentration of fluoride ions in the effluent.

[0026] The aforementioned storage tank 10 can be made of corrosion-resistant materials (such as PP, PE, or stainless steel). A liquid level sensor can be installed inside the storage tank 10 to monitor the remaining amount of the treatment solution in real time. A sealing cap and a feeding port can be installed on the top of the storage tank 10 to ensure the airtightness of the storage tank 10. At the same time, the treatment solution can be added to the storage tank 10 through the feeding port. The inlet end of the dosing pipeline 60 can be located at the bottom of the storage tank 10. A filter can be installed at the inlet end of the dosing pipeline to prevent impurities in the treatment solution from clogging the valve 50.

[0027] The aforementioned reaction tank can also be made of corrosion-resistant materials (such as PP, PE, or stainless steel). A stirring device can be installed inside the reaction tank to ensure that the fluoride-containing wastewater and the treatment solution are fully mixed. A sludge discharge outlet can be installed at the bottom of the reaction tank, and an inlet and an outlet can be installed on the side wall of the reaction tank. The outlet is located on the side near the top of the reaction tank to ensure the discharge of the supernatant, and the inlet is located on the side near the bottom of the reaction tank to allow the fluoride-containing wastewater generated during production to enter the reaction tank.

[0028] The fluoride wastewater treatment system also includes a controller 30, a detector 40, and a valve 50. The detector 40 can be directly installed in the reaction tank to obtain the fluoride ion concentration in the reaction tank in real time, or only the detection end of the detector 40 can be extended into the reaction tank while the signal end of the detector 40 remains outside the reaction tank. The valve 50 is installed on the dosing pipeline 60 and is located on the side near the outlet end of the dosing pipeline 60. The controller 30 is electrically connected to the detector 40 and the valve 50 respectively. The controller 30 is used to control the valve 50 to perform opening and closing actions according to the fluoride ion concentration obtained by the detector 40 in real time, so as to add a certain amount of treatment solution into the reaction tank.

[0029] In use, fluoride-containing wastewater enters the reaction tank through the inlet pipe and the inlet of the reaction tank until it reaches the preset liquid level (which can be triggered by the liquid level sensor in the reaction tank). The stirring device is then activated to mix the fluoride-containing wastewater evenly. Subsequently, the detector 40 can start continuous sampling (or sampling at preset time intervals) to monitor the fluoride ion concentration in the reaction tank in real time and convert the fluoride ion concentration into an analog signal, which is then transmitted to the controller 30. Initially, the valve 50 is in the closed state. The controller 30 reads the fluoride ion concentration obtained by the detector 40 in real time and determines the corresponding dosage. It then controls the valve 50 to open, and the treatment solution in the storage tank 10 can be introduced into the reaction tank through the dosing pipe 60 to react with the fluoride-containing wastewater. Fluoride precipitates (such as calcium fluoride) are generated. Controller 30 compares the instantaneous fluoride ion concentration with the target threshold in real time. If the difference is large, the opening of valve 50 can be increased (or the opening time can be extended) to increase the dosing rate. If the difference is small, the opening of valve 50 can be decreased (or the opening time can be shortened) to reduce the dosing rate. When the detected concentration is less than the target threshold, controller 30 controls valve 50 to close and stop the dosing. The stirring device continues to operate to ensure a complete chemical reaction. Then, the mixture is allowed to settle. Finally, the qualified wastewater is discharged through the outlet of the reaction tank, and the sludge generated by the reaction is discharged through the sludge discharge outlet. If the detector 40 detects that the fluoride ion concentration exceeds the target during the discharge process, the outlet is immediately closed and the dosing process is restarted.

[0030] As one possible implementation method, such as Figure 1 and Figure 2 As shown, the controller 30 is equipped with multiple preset fluoride ion concentration levels and corresponding valve 50, which has a first duration for opening and a second duration for closing. The controller 30 is used to determine the target fluoride ion concentration level based on the fluoride ion concentration obtained by the detector 40, and to control the valve 50 to periodically perform opening and closing actions according to the first and second durations corresponding to the target fluoride ion concentration level.

[0031] It should be noted that the controller 30 is equipped with multiple preset fluoride ion concentration levels and corresponding first durations and second durations for valve 50 to open and close. Based on the common concentration range of industrial fluoride-containing wastewater, the controller is divided into four levels and their corresponding first and second durations. The specific parameters for each level are set according to the principle that "the higher the concentration, the longer the first duration and the shorter the second duration." For example, when the fluoride ion concentration is 10-30 mg / L, the controller valve 50 opens for 6 seconds and closes for 30 seconds; when the fluoride ion concentration is 30-50 mg / L, the controller valve 50 opens for 8 seconds and closes for 25 seconds; when the fluoride ion concentration is 50-100 mg / L, the controller valve 50 opens for 30 seconds and closes for 20 seconds; when the fluoride ion concentration is 100-200 mg / L, the controller valve 50 opens for 60 seconds and closes for 10 seconds, and so on.

[0032] In operation, after the fluoride-containing wastewater enters the reaction tank to the preset level, the stirring device is activated, and the detector 40 begins to collect fluoride ion concentration data. The controller 30 filters the collected fluoride ion concentration values ​​(removing abnormal fluctuations) to obtain the effective fluoride ion concentration value. The controller 30 compares the effective fluoride ion concentration value with the preset concentration ranges for each level to determine the corresponding target fluoride ion concentration level. After determining the target fluoride ion concentration level, the controller 30 calls the first and second time intervals corresponding to that level to initiate the periodic dosing action: the valve 50 is first opened for the first time interval to inject the treatment solution into the reaction tank; after the opening action ends, the valve 50 is closed for the second time interval to stop the dosing and allow the treatment solution to fully react with the fluoride-containing wastewater. After one dosing cycle (i.e., the first and second time intervals) ends, the controller 30 re-determines the target fluoride ion concentration level based on the real-time fluoride ion concentration data updated by the detector 40 and dynamically adjusts the specific duration of the valve 50's opening and closing actions.

[0033] The specific duration for the opening and closing actions of the dynamic valve 50 based on the fluoride ion concentration level can improve the precise matching between the dosage of the treatment solution and the real-time fluoride ion concentration in the reaction tank, thereby improving the utilization rate of the treatment solution, reducing waste, and consequently reducing sludge production. The specific parameters of the above-mentioned preset multiple levels can be directly applied by users or customized, making it suitable for the treatment of fluoride-containing wastewater in different industries (chemical, electronics, electroplating). The periodic opening and closing design can reduce the continuous operating load of the valve 50, extend its service life, and improve the durability of the equipment.

[0034] As one possible implementation method, such as Figure 1 and Figure 2As shown, the reaction tank includes a first sub-reaction tank 21 and a second sub-reaction tank 22. The water inlet pipe, the first sub-reaction tank 21 and the second sub-reaction tank 22 are connected in sequence. The dosing pipe 60 is connected to the second sub-reaction tank 22. The detector 40 is located in the first sub-reaction tank 21 to obtain the fluoride ion concentration in the first sub-reaction tank 21.

[0035] It should be noted that the reaction tank includes a first sub-reaction tank 21 and a second sub-reaction tank 22. The inlet pipe, the first sub-reaction tank 21 and the second sub-reaction tank 22 are connected in sequence, and the dosing pipe 60 is connected to the second sub-reaction tank 22. In this way, the fluoride-containing wastewater enters the first sub-reaction tank 21 through the inlet pipe. The stirring device is started to mix the fluoride-containing wastewater evenly. The detector 40 starts to collect the fluoride ion concentration data of the first sub-reaction tank 21. The controller 30 filters the fluoride ion concentration data and determines the corresponding target fluoride ion concentration level. According to the concentration level of the first sub-reaction tank 21, the controller 30 calls the corresponding first and second time periods to control the valve 50 to open and close periodically, and the treatment solution is introduced into the second sub-reaction tank 22. It is fully mixed and reacted with the fluoride-containing wastewater introduced from the first sub-reaction tank 21 to generate fluoride precipitate (such as calcium fluoride). After the reaction is completed, it is allowed to settle and the supernatant is discharged through the outlet. The sludge is discharged periodically through the bottom discharge port.

[0036] The fluoride-containing wastewater treatment system employs a two-stage reaction tank series design (i.e., the inlet pipe, the first sub-reaction tank 21, and the second sub-reaction tank 22 are connected sequentially). This allows the fluoride-containing wastewater to first enter the first reaction tank, where it undergoes preliminary mixing and buffering, resulting in more homogeneous water quality. A detector 40 is installed in the first reaction tank to obtain a more stable and reliable fluoride ion concentration signal, effectively overcoming the interference of instantaneous fluctuations in the inlet water on the treatment system. The fluoride-containing wastewater in the first reaction tank then enters the second reaction tank, and the dosing pipeline 60 is located on the second reaction tank. This ensures that the dosage of the treatment solution in the second reaction tank is based on the data of the stabilized water quality in the first reaction tank, making the reaction conditions more controllable. The fluoride flocs formed are more likely to precipitate in the second reaction tank, further ensuring the stable compliance of the effluent water quality, thereby improving sedimentation efficiency, effluent clarity, and reagent utilization efficiency.

[0037] As one possible implementation method, such as Figure 1 and Figure 2 As shown, the fluoride-containing wastewater treatment system also includes a return pipeline 70. The inlet end of the return pipeline 70 is connected to the outlet end of the dosing pipeline 60 near the valve 50. The outlet end of the return pipeline 70 is connected to the storage tank 10. When the valve 50 performs the closing action, the treatment solution in the dosing pipeline 60 can flow back to the storage tank 10 through the return pipeline 70.

[0038] It should be noted that the fluoride-containing wastewater treatment system also includes a return pipeline 70. The inlet end of the return pipeline 70 is connected to the outlet end of the dosing pipeline 60 near the valve 50, ensuring that the residual treatment solution in the dosing pipeline 60 can be introduced into the return pipeline 70 after the valve 50 is closed. The outlet end of the return pipeline 70 is connected to the storage tank 10. When the valve 50 is opened, the treatment solution in the storage tank 10 can flow into the reaction tank through the dosing pipeline 60. When the valve 50 is closed, the treatment solution in the dosing pipeline 60 can flow from the dosing pipeline 60 to the storage tank 10 through the return pipeline 70, ensuring that the residual treatment solution in the dosing pipeline 60 is completely recovered.

[0039] As one possible implementation method, such as Figure 1 and Figure 2 As shown, the return pipe 70 is provided with an anti-backflow structure on the side near the outlet end of the dosing pipe 60. For example, in this embodiment, the anti-backflow structure is a water trap.

[0040] It should be noted that the return pipe 70 is equipped with an anti-backflow structure on the side near the outlet end of the dosing pipe 60. For example, the anti-backflow structure can be a U-shaped water trap. During the dosing stage, valve 50 is opened (at this time, the dosing pipe 60 is open and the return pipe 70 is closed). A certain amount of treatment solution is retained in the water trap to form a stable liquid seal, blocking the connection between the dosing pipe 60 and the return pipe 70 and preventing the solution from diverting. During the return stage, valve 50 is closed (at this time, the dosing pipe 60 is closed and the return pipe 70 is open). The residual solution in the dosing pipe 60 flows into the water trap to replenish the liquid seal solution. After that, the excess solution flows back to the storage tank 10 through the return pipe 70 to ensure that the liquid seal remains effective at all times and to completely prevent backflow, air entrapment, and impurity infiltration.

[0041] As one possible implementation, the return line 70 is made of EPDM rubber, and / or the valve 50 is made of unplasticized PVC or EPDM rubber.

[0042] As one possible implementation method, such as Figure 1 and Figure 2 As shown, the fluoride-containing wastewater treatment system also includes a dosing pump 80, which is installed on the dosing pipeline 60. The dosing pump 80 is used to introduce the treatment solution in the storage tank 10 into the reaction tank via the dosing pipeline 60. In one possible implementation, the dosing pump 80 is located on the side of the dosing pipeline 60 closer to the storage tank 10, and the valve 50 is located on the side of the dosing pipeline 60 closer to the reaction tank.

[0043] It should be noted that the fluoride-containing wastewater treatment system also includes a dosing pump 80, which is installed on the dosing pipeline 60, specifically between the outlet of the storage tank 10 and the valve 50 of the dosing pipeline 60. The dosing pump 80 is located on the side of the dosing pipeline 60 closer to the storage tank 10, and the valve 50 is located on the side of the dosing pipeline 60 closer to the reaction tank. The controller 30 controls the operation of the dosing pump 80 to introduce the treatment solution in the storage tank 10 into the reaction tank through the dosing pipeline 60. For example, the controller 30 triggers the dosing pump 80 and the valve 50 to open or close synchronously to ensure that the treatment solution is delivered as needed. Furthermore, the output pressure of the dosing pump 80 and the natural reflux of the return pipeline 70 work together to achieve the following synergistic effect: when the pump is turned on, the output pressure pushes the liquid to flow preferentially to the second sub-reaction tank 22, avoiding liquid diversion; when the pump is turned off, the residual liquid in the dosing pipeline 60, under the combined effect of pressure difference and liquid level difference, quickly flows back to the storage tank 10 through the water trap, thereby improving the reflux efficiency.

[0044] As one possible implementation, detector 40 is a fluorine meter, and / or valve 50 is a pneumatic valve.

[0045] A second aspect of this application provides a method for treating fluoride-containing wastewater, which uses the fluoride-containing wastewater treatment system described above to treat the fluoride-containing wastewater.

[0046] It should be noted that the specific structure of the fluoride-containing wastewater treatment method provided in this embodiment is the same as that of the fluoride-containing wastewater treatment system described above. Those skilled in the art can deduce the fluoride-containing wastewater treatment method based on the description of the specific structure of the fluoride-containing wastewater treatment system described above, and this application will not repeat the description. Since the fluoride-containing wastewater treatment method provided in this embodiment is used to prepare the aforementioned fluoride-containing wastewater treatment system, this method has the same beneficial effects as the aforementioned fluoride-containing wastewater treatment system, and will not be elaborated further here.

[0047] The above description is merely an optional embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0048] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately.

Claims

1. A treatment system for fluoride-containing wastewater, characterized in that, The device includes a storage tank, a reaction tank, a controller, a detector, and a valve. The storage tank is used to store the treatment solution, and the reaction tank is used to store fluoride-containing wastewater. The storage tank and the reaction tank are connected by a dosing pipeline. The detector is installed in the reaction tank to obtain the fluoride ion concentration in the reaction tank. The valve is installed on the dosing pipeline. The controller is connected to the detector and the valve and is used to control the valve to open and close based on the fluoride ion concentration obtained by the detector.

2. The fluoride-containing wastewater treatment system according to claim 1, characterized in that, The controller is configured with multiple preset fluoride ion concentration levels and corresponding first durations for the valve to open and second durations for the valve to close. The controller is used to determine the target fluoride ion concentration level based on the fluoride ion concentration obtained by the detector, and to control the valve to periodically open and close according to the first and second durations corresponding to the target fluoride ion concentration level.

3. The fluoride-containing wastewater treatment system according to claim 1, characterized in that, The reaction tank includes a first sub-reaction tank and a second sub-reaction tank. The water inlet pipeline, the first sub-reaction tank and the second sub-reaction tank are connected in sequence. The dosing pipeline is connected to the second sub-reaction tank. The detector is located in the first sub-reaction tank to obtain the fluoride ion concentration in the first sub-reaction tank.

4. The fluoride-containing wastewater treatment system according to claim 1, characterized in that, It also includes a return pipeline, the inlet end of which is connected to the outlet end of the dosing pipeline near the valve, and the outlet end of the return pipeline is connected to the storage tank. When the valve is closed, the treatment solution in the dosing pipeline can flow back to the storage tank via the return pipeline.

5. The fluoride-containing wastewater treatment system according to claim 4, characterized in that, The return pipeline is equipped with an anti-backflow structure on the side near the outlet end of the dosing pipeline.

6. The fluoride-containing wastewater treatment system according to claim 4, characterized in that, The return pipeline is made of EPDM rubber, and / or the valve is made of unplasticized PVC or EPDM rubber.

7. The fluoride-containing wastewater treatment system according to claim 1, characterized in that, It also includes a dosing pump, which is installed on the dosing pipeline and is used to introduce the treatment solution in the storage tank into the reaction tank through the dosing pipeline.

8. The fluoride-containing wastewater treatment system according to claim 7, characterized in that, The dosing pump is located on the side of the dosing pipeline closer to the storage tank, and the valve is located on the side of the dosing pipeline closer to the reaction tank.

9. The fluoride-containing wastewater treatment system according to claim 1, characterized in that, The detector is a fluorine meter, and / or the valve is a pneumatic valve.

10. A method for treating fluoride-containing wastewater, characterized in that, The fluoride-containing wastewater is treated using the fluoride-containing wastewater treatment system as described in any one of claims 1 to 9.

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