Fluorine-containing wastewater treatment system

Abstract

A fluorine-containing wastewater treatment system comprises: a reaction tank suitable for accommodating fluorine-containing wastewater; the filtering device is fixed on the surface of the side wall of the top of the reaction tank, and the filtering device is communicated with the side wall of the reaction tank; the cleaning tank is fixed on the surface of the side wall of the bottom of the reaction tank, and the cleaning tank is communicated with the filtering device. The filtering device is arranged on the surface of the side wall of the top of the reaction tank, and the filtering device is communicated with the cleaning tank, so that the upper-layer fluorine-containing wastewater in the reaction tank is filtered into the cleaning tank, impurities in the fluorine-containing wastewater are filtered, the accuracy of subsequent measurement of the fluorine content in the fluorine-containing wastewater is improved, and the measurement accuracy of the fluorine content in the fluorine-containing wastewater is improved. The fluorine-containing wastewater in the cleaning tank is upper-layer fluorine-containing wastewater in the reaction tank, and part of impurities sink to the bottom of the reaction tank due to primary precipitation of the upper-layer fluorine-containing wastewater, so that the medium stability of the fluorine-containing wastewater is further improved, and the accuracy of subsequent measurement of the fluorine content in the fluorine-containing wastewater is improved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a fluoride-containing wastewater treatment system. Background Technology

[0002] Industrial activities, such as glassmaking, electroplating, aluminum and steel smelting, and semiconductor manufacturing, widely utilize large quantities of fluoride chemicals, thus creating the problem of fluoride-containing wastewater treatment. To avoid environmental pollution from fluoride ions in fluoride-containing wastewater and to ensure that discharged industrial wastewater meets emission standards, the industry is diligently researching relevant treatment procedures to minimize the adverse environmental impact of wastewater discharge.

[0003] However, current fluoride-containing wastewater treatment systems still produce wastewater with excessive fluoride content. Utility Model Content

[0004] The technical problem solved by this invention is how to reduce the fluoride content in fluoride-containing wastewater.

[0005] To solve the above-mentioned technical problems, this utility model provides a fluoride-containing wastewater treatment system, including: a reaction tank suitable for containing fluoride-containing wastewater; a filter device fixed to the top side wall surface of the reaction tank and communicating with the side wall of the reaction tank; and a cleaning tank fixed to the bottom side wall surface of the reaction tank and communicating with the filter device.

[0006] Optionally, the filtration device includes one or more combinations of a filter screen, a filter membrane, and an adsorption medium.

[0007] Optionally, the filter screen may be made of polypropylene fiber or cotton, the filter membrane may be made of polyvinylidene fluoride or polytetrafluoroethylene, and the adsorption medium may be made of activated carbon.

[0008] Optionally, the fluoride-containing wastewater treatment system further includes: a monitoring probe adapted to measure the fluoride content of the fluoride-containing wastewater and obtain a measurement value; and a cleaning device adapted to clean the reactive substances on the surface of the monitoring probe.

[0009] Optionally, the fluoride-containing wastewater treatment system further includes: a dosing device, which is mounted on the top of the reaction tank, and part of the dosing device is located inside the reaction tank; and an automatic dosing control unit, adapted to adjust the dosage of the agent added to the reaction tank by the dosing device according to the measured value, until the fluoride ion concentration of the fluoride-containing wastewater after defluorination reaches the target value, which is not greater than the discharge standard.

[0010] Optionally, the cleaning device is an aeration device, which includes: an air supply pipe, which is clamped at the top of the cleaning tank and a portion of the air supply pipe is located inside the cleaning tank; an aeration valve, adapted to control the opening or closing of the passage in the air supply pipe; a compression unit, adapted to provide compressed gas to the air supply pipe; and a first control unit, adapted to control the opening or closing of the compression unit within a preset interval, wherein the first control unit is also adapted to control the opening or closing of the aeration valve according to the working state of the compression unit.

[0011] Optionally, the automatic dosing control unit is also adapted to adjust the first control unit to be turned on or off based on the measured value.

[0012] Optionally, the cleaning device is an ultrasonic device, which includes: an ultrasonic generator adapted to convert electrical energy into high-frequency electrical signals; a transducer adapted to convert the high-frequency electrical signals into mechanical vibrations to generate ultrasonic waves through the piezoelectric effect; and a second control unit adapted to control the ultrasonic generator to turn on or off within a preset interval.

[0013] Optionally, the automatic dosing control unit is also adapted to adjust the second control unit to be turned on or off based on the measured value.

[0014] Optionally, the preset interval time ranges from 12 hours to 24 hours.

[0015] Optionally, the reaction tank includes an adjustment tank and a coagulation tank; the filtration device includes a first sub-filtration device and a second sub-filtration device; the cleaning tank includes a first sub-cleaning tank and a second sub-cleaning tank; and the washing device includes a first sub-washing device and a second sub-washing device. The first sub-filtration device is fixed to the top sidewall surface of the adjustment tank, and the first sub-filtration device and the top sidewall surface of the adjustment tank are connected via a first connecting pipe. The first sub-cleaning tank is fixed to the bottom sidewall surface of the adjustment tank, and the first sub-cleaning tank and the first sub-filtration device are connected via a second connecting pipe, with a portion of the first sub-washing device located within the first sub-cleaning tank. The adjustment tank and the coagulation tank are connected via a third connecting pipe. The second sub-filtration device is fixed to the top sidewall surface of the coagulation tank, and the second sub-filtration device and the top sidewall surface of the coagulation tank are connected via a fourth connecting pipe. The second sub-cleaning tank is fixed to the bottom sidewall surface of the coagulation tank, and the second sub-cleaning tank and the second sub-filtration device are connected via a fifth connecting pipe, with a portion of the second sub-washing device located within the second sub-cleaning tank.

[0016] Optionally, the first sub-cleaning tank and the first sub-filter are located on the left side of the regulating tank, and the second sub-cleaning tank and the second sub-filter are located on the left side of the coagulation tank, with the first sub-cleaning tank and the second sub-cleaning tank being separately or connected; or the first sub-cleaning tank and the first sub-filter are located on the left side of the regulating tank, and the second sub-cleaning tank and the second sub-filter are located on the right side of the coagulation tank, with the first sub-cleaning tank and the second sub-cleaning tank being separately or connected.

[0017] Optionally, the fluoride-containing wastewater treatment system includes: a first dosing device, which is mounted on the top of the regulating tank, and a portion of the first dosing device is located inside the regulating tank; a second dosing device, which is mounted on the top of the regulating tank, and a portion of the second dosing device is located inside the coagulation tank; and a clear water tank, which is connected to the coagulation tank via a sixth connecting pipe.

[0018] Compared with the prior art, the technical solution of this utility model embodiment has the following beneficial effects:

[0019] In this utility model, a filtration device is installed on the top side wall surface of the reaction tank, and the filtration device is connected to the cleaning tank. This allows the upper layer of fluoride-containing wastewater in the reaction tank to be filtered into the cleaning tank, thereby filtering impurities in the fluoride-containing wastewater and improving the accuracy of subsequent measurements of fluoride content in the wastewater. The fluoride-containing wastewater in the cleaning tank is the upper layer of fluoride-containing wastewater in the reaction tank. Since the upper layer of fluoride-containing wastewater has already undergone one sedimentation, some impurities have settled to the bottom of the reaction tank, further improving the medium stability of the fluoride-containing wastewater and improving the accuracy of subsequent measurements of fluoride content in the wastewater. As a result, the defluorination ion treatment process can be controlled based on the measured fluoride content, thereby reducing the fluoride content in the wastewater and meeting emission standards.

[0020] Furthermore, in this utility model's technical solution, a cleaning device is used to clean the reactive substances on the surface of the monitoring probe, reducing the reading deviation caused by the reactive substances on the surface of the monitoring probe, improving the accuracy of the measurement, and thus enabling the control of the defluorination ion treatment process based on the measured fluoride content, thereby reducing the fluoride content in the fluoride-containing wastewater and meeting the emission standards.

[0021] Furthermore, in this utility model's technical solution, an automatic dosing control unit is adopted to adjust the dosage of the agent added to the reaction by the dosing device according to the measured value, thereby realizing automated control of the dosage, saving manpower, improving reaction efficiency, avoiding waste of agents, and controlling the cost of fluoride-containing wastewater treatment. Attached Figure Description

[0022] Figure 1This is a schematic diagram of a fluoride-containing wastewater treatment system.

[0023] Figure 2 This is a schematic diagram of the structure of the fluoride-containing wastewater treatment system described in one embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the fluoride-containing wastewater treatment system described in another embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the fluoride-containing wastewater treatment system described in another embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the fluoride-containing wastewater treatment system described in another embodiment of the present invention. Detailed Implementation

[0027] It should be noted that the terms "surface" and "on" in this specification are used to describe the relative spatial position and are not limited to whether there is direct contact.

[0028] Please refer to the current structure of fluoride-containing wastewater treatment systems. Figure 1 The fluoride-containing wastewater treatment system includes: an equalization tank 101, a coagulation tank 102, and a clear water tank 103. The equalization tank 101 and the coagulation tank 102 are connected by a connecting pipe, and the coagulation tank 102 and the clear water tank 103 are connected by a connecting pipe.

[0029] The fluoride-containing wastewater treatment system also includes: a monitoring probe 1012, a first dosing device 1011, and a second dosing device 1021.

[0030] The first dosing device 1011 is mounted on the top of the regulating tank 101, and a portion of the first dosing device 1011 is located inside the regulating tank 101; the second dosing device 1021 is mounted on the top of the coagulation tank 102, and a portion of the second dosing device 1021 is located inside the coagulation tank 102; the monitoring probe 1012 is mounted on the top of the regulating tank 101, and a portion of the monitoring probe 1012 is located inside the regulating tank 101, to measure the fluoride content of the fluoride-containing wastewater and obtain a measurement value.

[0031] In the above scheme, the regulating tank 101 is used to contain the fluoride-containing wastewater after the reaction, and the fluoride-containing wastewater after the reaction contains a large number of impurities, making the measurement solution unstable. In addition, the monitoring probe 1012 is directly located in the regulating tank 101, that is, the monitoring probe 1012 directly measures the fluoride-containing wastewater after the reaction, which causes the measurement results to be biased, thereby affecting the subsequent treatment of the fluoride-containing wastewater.

[0032] To address the aforementioned technical problems, this utility model provides a fluoride-containing wastewater treatment system. The filtration device is located on the top side wall surface of the reaction tank and is connected to a cleaning tank. This allows the upper layer of fluoride-containing wastewater in the reaction tank to be filtered into the cleaning tank, thereby filtering impurities from the fluoride-containing wastewater and improving the accuracy of subsequent measurements of fluoride content in the wastewater. The fluoride-containing wastewater in the cleaning tank is the upper layer of fluoride-containing wastewater in the reaction tank. Since the upper layer of fluoride-containing wastewater has already undergone one sedimentation, some impurities have settled to the bottom of the reaction tank, further improving the medium stability of the fluoride-containing wastewater and enhancing the accuracy of subsequent measurements of fluoride content. Consequently, the defluorination ion treatment process can be controlled based on the measured fluoride content, achieving a reduction in fluoride content in the wastewater and meeting emission standards.

[0033] To make the above-mentioned objectives, features and beneficial effects of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0034] Please refer to Figure 2 This utility model provides a fluoride-containing wastewater treatment system, including: a reaction tank 201, suitable for containing fluoride-containing wastewater; a filter device 202, which is fixed to the top side wall surface of the reaction tank 201 and communicates with the side wall of the reaction tank 201; and a cleaning tank, which is fixed to the bottom side wall surface of the reaction tank 201 and communicates with the filter device 202.

[0035] It should be noted that the filtration device 202 is suitable for filtering the upper layer of fluoride-containing wastewater in the reaction tank 201; the cleaning tank is suitable for containing the filtered fluoride-containing wastewater, and the cleaning tank is also suitable for serving as a container for subsequent cleaning of the monitoring probe 207.

[0036] In some embodiments of this utility model, the reaction tank 201 includes an adjustment tank or a coagulation tank.

[0037] In some embodiments of this utility model, the filtration device 202 includes one or more combinations of a filter screen, a filter membrane, and an adsorption medium.

[0038] In a specific embodiment of this utility model, the material of the filter screen includes polypropylene fiber or cotton, the material of the filter membrane includes polyvinylidene fluoride or polytetrafluoroethylene, and the material of the adsorption medium includes activated carbon.

[0039] In the above scheme, by setting a filter device 202 on the top side wall surface of the reaction tank 201, and the filter device 202 being connected to the cleaning tank, the upper layer of fluoride-containing wastewater in the reaction tank 201 is filtered into the cleaning tank, thereby filtering impurities in the fluoride-containing wastewater and improving the accuracy of subsequent measurements of fluoride content in the fluoride-containing wastewater. The fluoride-containing wastewater in the cleaning tank is the upper layer of fluoride-containing wastewater in the reaction tank 201. Since the upper layer of fluoride-containing wastewater has already undergone one sedimentation, some impurities have settled to the bottom of the reaction tank 201, further improving the medium stability of the fluoride-containing wastewater and improving the accuracy of subsequent measurements of fluoride content in the fluoride-containing wastewater. Thus, the defluorination ion treatment process can be controlled according to the measured fluoride content, thereby reducing the fluoride content in the fluoride-containing wastewater and meeting emission standards.

[0040] In some embodiments of this utility model, the fluoride-containing wastewater treatment system further includes: a monitoring probe 207, which is adapted to measure the fluoride content of the fluoride-containing wastewater and obtain a measurement value; and a cleaning device, which is adapted to clean the reactive substances on the surface of the monitoring probe 207.

[0041] In some embodiments of this utility model, the fluoride-containing wastewater treatment system further includes: a dosing device, which is mounted on the top of the reaction tank 201, and part of the dosing device is located inside the reaction tank 201; and an automatic dosing control unit 206, adapted to adjust the dosage of the agent added to the reaction tank by the dosing device according to the measured value, until the fluoride ion concentration of the fluoride-containing wastewater after defluorination reaches the target value, wherein the target value is not greater than the discharge standard.

[0042] The dosing device includes a dosing pipe 204 and a dosing valve 205. The dosing valve 205 is mounted on the dosing pipe 204 to control the dosage of the drug entering the reaction tank 201. The dosing valve 205 is opened or closed in response to the automatic dosing control unit 206.

[0043] In some embodiments of this utility model, the automatic dosing control unit 206 includes at least one of a PID (Proportional-Integral-Derivative) controller and a segmented controller. The automatic dosing control unit 206 may include only one of a PID controller and a segmented controller, or it may include both. When the automatic dosing control unit 206 includes both a PID controller and a segmented controller, either the PID controller or the segmented controller can be selected to control the dosage of the agent added to the reaction tank 201 by the dosing device. When the automatic dosing control unit 206 includes a PID controller, the PID controller can perform PID calculations on the deviation between the measured value and the target value to calculate the target dosage. Then, the dosing device can add the agent according to the target dosage.

[0044] In a specific embodiment, the target value is lower than the emission standard, which not only results in a lower concentration of fluoride ions in the treated fluoride-containing wastewater, reducing environmental pollution, but also prevents the treated fluoride-containing wastewater from exceeding the emission standard due to a slightly lower dosage caused by accident. In this embodiment, the target value is 15 mg / L, and the emission standard is 20 mg / L.

[0045] It should be noted that, in other embodiments, the target value may also be equal to the emission standard, and the target value may be set to any other numerical point or range that is less than the emission standard.

[0046] In some embodiments of this utility model, the monitoring probe 207 is mounted on the top of the reaction tank 201, and part of the monitoring probe 207 is located inside the reaction tank 201; the cleaning device is mounted on the top of the cleaning tank, and part of the cleaning device is located inside the cleaning tank.

[0047] In a specific embodiment of this utility model, the cleaning device is an aeration device, which includes: an air supply pipe 208, which is clamped at the top of the cleaning tank, and a portion of the air supply pipe 208 is located inside the cleaning tank; an aeration valve 209, adapted to control the opening or closing of the channel inside the air supply pipe 208; a compression unit 210, adapted to provide compressed gas to the air supply pipe 208; and a first control unit 211, adapted to control the opening or closing of the compression unit 210 within a preset interval time. The first control unit 211 is also adapted to control the opening or closing of the aeration valve 209 according to the working state of the compression unit 210.

[0048] The aeration device further includes a cleaning valve, which is mounted on the air supply pipe 208 to control the entry of compressed gas into the cleaning tank.

[0049] In some embodiments of this utility model, the preset interval time ranges from 12 hours to 24 hours.

[0050] Among them, part of the air supply pipe 208 in the aeration device is located inside the cleaning tank.

[0051] In a specific embodiment, the cleaning principle of the aeration device is as follows: compressed gas is provided by the compression unit 210 and injected into the fluoride-containing wastewater in the reaction tank 201 through the gas supply pipe 208, forming a large number of micro bubbles. The bubbles rise in the fluoride-containing wastewater and come into contact with the surface of the monitoring probe 207 during the rising process. The impact force generated when the bubbles burst and the flow of the fluoride-containing wastewater can remove dirt or deposits from the surface of the monitoring probe 207.

[0052] In this embodiment, the automatic dosing control unit 206 is also adapted to adjust the first control unit 211 to be turned on or off according to the measured value.

[0053] In some other embodiments of this invention, the cleaning device is disposed at the bottom of the cleaning tank.

[0054] For specific embodiments of this utility model, please refer to Figure 3 The cleaning device is an ultrasonic device, which includes: an ultrasonic generator 309, adapted to convert electrical energy into high-frequency electrical signals; a transducer 308, adapted to convert high-frequency electrical signals into mechanical vibrations and generate ultrasonic waves through the piezoelectric effect; and a second control unit 310, adapted to control the ultrasonic generator 309 to turn on or off within a preset interval.

[0055] The transducer 308 in the ultrasonic device is located at the bottom of the cleaning tank.

[0056] In this embodiment, the automatic dosing control unit 206 is also adapted to adjust the second control unit 310 to be turned on or off according to the measured value.

[0057] In a specific embodiment, the cleaning principle of the ultrasonic device is as follows: the ultrasonic generator 309 generates a high-frequency electrical signal, and the transducer 308 converts the high-frequency electrical energy (20kHz to 80kHz) into mechanical vibration. These vibrations are transmitted to the fluoride-containing wastewater in the cleaning tank 203 to form ultrasonic waves, thereby removing the reactive substances on the monitoring probe.

[0058] In other embodiments of this utility model, the cleaning tank further includes a sensor adapted to monitor the thickness and area of ​​the reactive substance attached to the monitoring probe. When the thickness and area of ​​the reactive substance attached to the monitoring probe reach a preset threshold, the cleaning device is turned on to clean the reactive substance attached to the monitoring probe.

[0059] In the above scheme, by setting up a cleaning device to clean the reactive substances on the surface of the monitoring probe 207, the reading deviation caused by the reactive substances on the surface of the monitoring probe 207 is reduced, the measurement accuracy is improved, and the defluorination ion treatment process can be controlled according to the measured fluoride content, so as to reduce the fluoride content in the fluoride wastewater and meet the emission standards.

[0060] In addition, by using an automatic dosing control unit 206, the dosage of the agent added to the reaction by the dosing device is adjusted according to the measured value, thereby realizing the automatic control of the dosage, saving manpower, improving reaction efficiency, avoiding waste of agents, and controlling the cost of fluoride-containing wastewater treatment.

[0061] The following is combined with Figure 4 The structure of the fluoride-containing wastewater treatment system is described.

[0062] Please refer to Figure 4 In the fluoride-containing wastewater treatment system, the reaction tank includes an equalization tank 401 and a coagulation tank 418; the filtration device includes a first sub-filtration device 402 and a second sub-filtration device 414; the cleaning tank includes a first sub-cleaning tank 403 and a second sub-cleaning tank 420; and the washing device includes a first sub-washing device and a second sub-washing device. The first sub-filtration device 402 is fixed to the top sidewall surface of the equalization tank 401, and the first sub-filtration device 402 and the top sidewall surface of the equalization tank 401 are connected by a first connecting pipe 4021. The first sub-cleaning tank 403 is fixed to the bottom sidewall surface of the equalization tank 401, and the first sub-cleaning tank 403 and the first sub-filtration device... The first sub-cleaning device 402 is connected to the first sub-cleaning tank 403 via a second connecting pipe 4022; a portion of the first sub-cleaning device is located within the first sub-cleaning tank 403; the adjusting tank 401 and the coagulation tank 418 are connected via a third connecting pipe 4011; the second sub-filter 414 is fixed to the top side wall surface of the coagulation tank 418, and the second sub-filter 414 and the top side wall surface of the coagulation tank 418 are connected via a fourth connecting pipe 4041; the second sub-cleaning tank 420 is fixed to the bottom side wall surface of the coagulation tank 418, and the second sub-cleaning tank 420 and the second sub-filter 414 are connected via a fifth connecting pipe 4042, with a portion of the second sub-cleaning device located within the second sub-cleaning tank 420.

[0063] The first sub-filtration device 402 and the second sub-filtration device 414 include one or more combinations of filter screen, filter membrane and adsorption medium.

[0064] In some embodiments of this utility model, the first sub-cleaning device is an aeration device, which includes: a first air supply pipe 408, which is clamped at the top of the first sub-cleaning tank 403, and a portion of the first air supply pipe 408 is located inside the first sub-cleaning tank 403; the second sub-cleaning device is an aeration device, which includes: a second air supply pipe 416, which is clamped at the top of the second sub-cleaning tank 420, and a portion of the second air supply pipe 416 is located inside the second sub-cleaning tank 420.

[0065] In a specific embodiment, the first sub-cleaning tank 403 is located to the left of the adjusting tank 401, the first sub-filter 402 is located to the left of the adjusting tank 401, the second sub-cleaning tank 420 is located to the right of the coagulation tank 418, and the second sub-filter 414 is located to the right of the coagulation tank 418.

[0066] In this embodiment, the first sub-cleaning tank 403 and the second sub-cleaning tank 420 are separately arranged.

[0067] The first sub-cleaning device further includes a first aeration valve 409, which is engaged with the first sub-cleaning tank 403 to control the entry of compressed gas into the first sub-cleaning tank 403; the second sub-cleaning device further includes a second aeration valve 417, which is engaged with the second sub-cleaning tank 420 to control the entry of compressed gas into the second sub-cleaning tank 420.

[0068] The first sub-cleaning device further includes: a compression unit 410, adapted to provide compressed gas to the first air supply pipe 408 or the second air supply pipe 416; and a first control unit 411, adapted to control the opening or closing of the compression unit 410 within a preset interval time. The first control unit 411 is also adapted to control the opening or closing of the aeration valve according to the working state of the compression unit 410.

[0069] In other embodiments of this utility model, the first sub-cleaning device is an ultrasonic device, comprising: a first ultrasonic generator and a first transducer, wherein the first ultrasonic generator is disposed at the bottom of the first sub-cleaning tank and the first transducer is electrically connected to the first ultrasonic generator; the second sub-cleaning device is an ultrasonic device, comprising: a second ultrasonic generator and a second transducer, wherein the second ultrasonic generator is disposed at the bottom of the second sub-cleaning tank and the second transducer is electrically connected to the second ultrasonic generator.

[0070] The second sub-cleaning device further includes a second control unit, adapted to control the opening or closing of the first ultrasonic generator or the second ultrasonic generator within a preset interval.

[0071] In some embodiments of this utility model, the fluoride-containing wastewater treatment system further includes: a first dosing device, which is mounted on the top of the regulating tank 401, and a portion of the first dosing device is located inside the regulating tank 401; a second dosing device, which is mounted on the top of the regulating tank 401, and a portion of the second dosing device is located inside the coagulation tank 418; and a clear water tank 419, which is connected to the coagulation tank 418 via a sixth connecting pipe 4181.

[0072] In some embodiments of this utility model, the first dosing device includes: a first dosing pipe 404 and a first dosing valve 405, a portion of the first dosing pipe 404 is located in the regulating tank 401, and the first dosing valve 405 is engaged with the first dosing pipe 404 to control the dosage of medicine entering the regulating tank 401. The first dosing valve 405 is opened or closed in response to the automatic dosing control unit 406. The second dosing device includes: a second dosing pipe 412 and a second dosing valve 413, a portion of the second dosing pipe 412 is located in the coagulation tank 418, and the second dosing valve 413 is engaged with the second dosing pipe 412 to control the dosage of medicine entering the coagulation tank 418. The second dosing valve 413 is opened or closed in response to the automatic dosing control unit 406.

[0073] In a specific embodiment, the reaction process in the regulating tank 401 includes: the automatic dosing control unit 406 controls the first dosing valve 405 to open, so as to add calcium chloride (CaCl2) agent to the regulating tank 401 through the first dosing pipe 404. The calcium chloride (CaCl2) agent reacts with fluoride ions in the fluoride-containing wastewater to form CaF2 (calcium fluoride) precipitate, thereby reducing the fluoride ion concentration in the fluoride-containing wastewater.

[0074] In a specific embodiment, the reaction process in the coagulation tank 418 includes: the automatic dosing control unit 406 controls the second dosing valve 413 to open, so as to add coagulant PAC (polyaluminum chloride) into the coagulation tank 418 through the first dosing pipe 404, thereby improving sedimentation efficiency, reducing fluoride ion residue, and the coagulant PAC can form AlF (aluminum fluoride) complex with fluoride ions to adsorb fluoride ions. At the same time, it can also form flocs with calcium fluoride and other substances to achieve physical adsorption, reduce fluoride ions and impurities in fluoride-containing wastewater, improve the stability of the solution, and thus improve the accuracy of subsequent measurement of fluoride content in fluoride-containing wastewater.

[0075] In the above scheme, the aluminum fluoride and calcium fluoride reactants produced will adhere to the surface of the monitoring probe, affecting the accuracy of the measurement values.

[0076] In this embodiment, the agent is calcium chloride or coagulant PAC (polyaluminum chloride). However, it should be noted that the type of agent in the technical solution of this utility model is not limited to this embodiment, as long as it can react with fluoride ions to form a precipitate.

[0077] In some embodiments of this utility model, the fluoride-containing wastewater treatment system further includes: a first monitoring probe 407, which is mounted on the top surface of the regulating tank 403, and a portion of the first monitoring probe 407 is located within the regulating tank 403; and a second monitoring probe 415, which is mounted on the top surface of the coagulation tank 418, and a portion of the second monitoring probe 415 is located within the coagulation tank 418.

[0078] The following is combined with Figure 5 The structure of the fluoride-containing wastewater treatment system is described.

[0079] Please refer to Figure 5 In the fluoride-containing wastewater treatment system, the reaction tank includes an equalization tank 501 and a coagulation tank 518; the filtration device includes a first sub-filtration device 502 and a second sub-filtration device 514; the cleaning tank includes a first sub-cleaning tank 503 and a second sub-cleaning tank 520; and the washing device includes a first sub-washing device and a second sub-washing device. The first sub-filtration device 502 is fixed to the top sidewall surface of the equalization tank 501, and the first sub-filtration device 502 and the top sidewall surface of the equalization tank 501 are connected by a first connecting pipe 5021. The first sub-cleaning tank 503 is fixed to the bottom sidewall surface of the equalization tank 501, and the first sub-cleaning tank 503 and the first sub-filtration device... The first sub-cleaning device 502 is connected to the first sub-cleaning tank 503 via a second connecting pipe 5022; a portion of the first sub-cleaning device is located within the first sub-cleaning tank 503; the adjusting tank 501 and the coagulation tank 518 are connected via a third connecting pipe 5011; the second sub-filter 514 is fixed to the top side wall surface of the coagulation tank 518, and the second sub-filter 514 and the top side wall surface of the coagulation tank 518 are connected via a fourth connecting pipe 5041; the second sub-cleaning tank 520 is fixed to the bottom side wall surface of the coagulation tank 518, and the second sub-cleaning tank 520 and the second sub-filter 514 are connected via a fifth connecting pipe 5042, with a portion of the second sub-cleaning device located within the second sub-cleaning tank 520.

[0080] The first sub-filter device 502 and the second sub-filter device 514 include one or more combinations of filter screen, filter membrane and adsorption medium.

[0081] In some embodiments of this utility model, the first sub-cleaning device is an aeration device, which includes: a first air supply pipe 508, which is clamped at the top of the first sub-cleaning tank 503, and a portion of the first air supply pipe 508 is located inside the first sub-cleaning tank 503; the second sub-cleaning device is an aeration device, which includes: a second air supply pipe 516, which is clamped at the top of the second sub-cleaning tank 520, and a portion of the second air supply pipe 516 is located inside the second sub-cleaning tank 520.

[0082] In a specific embodiment, the first sub-cleaning tank 503 is located to the right of the adjusting tank 501, the first sub-filter 502 is located to the right of the adjusting tank 501, the second sub-cleaning tank 520 is located to the left of the coagulation tank 518, and the second sub-filter 514 is located to the left of the coagulation tank 518.

[0083] In this embodiment, the first sub-cleaning tank 503 and the second sub-cleaning tank 520 are connected.

[0084] The first sub-cleaning device further includes a first aeration valve 509, which is engaged with the first sub-cleaning tank 503 to control the entry of compressed gas into the first sub-cleaning tank 503; the second sub-cleaning device further includes a second aeration valve 517, which is engaged with the second sub-cleaning tank 520 to control the entry of compressed gas into the second sub-cleaning tank 520.

[0085] The first sub-cleaning device further includes: a compression unit 510, adapted to provide compressed gas to the first air supply pipe 508 or the second air supply pipe 516; and a first control unit 511, adapted to control the opening or closing of the compression unit 510 within a preset interval time. The first control unit 511 is also adapted to control the opening or closing of the aeration valve according to the working state of the compression unit 510.

[0086] In other embodiments of this utility model, the first sub-cleaning device is an ultrasonic device, comprising: a first ultrasonic generator and a first transducer, wherein the first ultrasonic generator is disposed at the bottom of the first sub-cleaning tank and the first transducer is electrically connected to the first ultrasonic generator; the second sub-cleaning device is an ultrasonic device, comprising: a second ultrasonic generator and a second transducer, wherein the second ultrasonic generator is disposed at the bottom of the second sub-cleaning tank and the second transducer is electrically connected to the second ultrasonic generator.

[0087] The second sub-cleaning device further includes a second control unit, adapted to control the opening or closing of the first ultrasonic generator or the second ultrasonic generator within a preset interval.

[0088] In some embodiments of this utility model, the fluoride-containing wastewater treatment system further includes: a first dosing device, which is mounted on the top of the regulating tank 501, and a portion of the first dosing device is located inside the regulating tank 501; a second dosing device, which is mounted on the top of the regulating tank 501, and a portion of the second dosing device is located inside the coagulation tank 518; and a clear water tank 519, which is connected to the coagulation tank 518 via a sixth connecting pipe 5181.

[0089] In some embodiments of this utility model, the first dosing device includes: a first dosing pipe 504 and a first dosing valve 505, a portion of the first dosing pipe 504 is located within the regulating tank 501, and the first dosing valve 505 is engaged with the first dosing pipe 504 to control the dosage of medicine entering the regulating tank 501. The first dosing valve 505 is activated or deactivated in response to the automatic dosing control unit 506. The second dosing device includes: a second dosing pipe 512 and a second dosing valve 513, a portion of the second dosing pipe 512 is located within the coagulation tank 518, and the second dosing valve 513 is engaged with the second dosing pipe 512 to control the dosage of medicine entering the coagulation tank 518. The second dosing valve 513 is activated or deactivated in response to the automatic dosing control unit 506.

[0090] In a specific embodiment, the reaction process in the regulating tank 501 includes: the automatic dosing control unit 506 controls the first dosing valve 505 to open, so as to add calcium chloride (CaCl2) agent to the regulating tank 501 through the first dosing pipe 504. The calcium chloride (CaCl2) agent reacts with fluoride ions in the fluoride-containing wastewater to form CaF2 (calcium fluoride) precipitate, thereby reducing the fluoride ion concentration in the fluoride-containing wastewater.

[0091] In a specific embodiment, the reaction process in the coagulation tank 518 includes: the automatic dosing control unit 506 controls the second dosing valve 513 to open, so as to add coagulant PAC (polyaluminum chloride) into the coagulation tank 518 through the first dosing pipe 504, thereby improving sedimentation efficiency, reducing fluoride ion residue, and the coagulant PAC can form AlF (aluminum fluoride) complex with fluoride ions to adsorb fluoride ions. At the same time, it can also form flocs with calcium fluoride and other substances to achieve physical adsorption, reduce fluoride ions and impurities in fluoride-containing wastewater, improve the stability of the solution, and thus improve the accuracy of subsequent measurement of fluoride content in fluoride-containing wastewater.

[0092] In the above scheme, the aluminum fluoride and calcium fluoride reactants produced will adhere to the surface of the monitoring probe, affecting the accuracy of the measurement values.

[0093] In this embodiment, the agent is calcium chloride or coagulant PAC (polyaluminum chloride). However, it should be noted that the type of agent in the technical solution of this utility model is not limited to this embodiment, as long as it can react with fluoride ions to form a precipitate.

[0094] In some embodiments of this utility model, the fluoride-containing wastewater treatment system further includes: a first monitoring probe 507, which is mounted on the top surface of the regulating tank 503, and a portion of the first monitoring probe 507 is located within the regulating tank 503; and a second monitoring probe 515, which is mounted on the top surface of the coagulation tank 518, and a portion of the second monitoring probe 515 is located within the coagulation tank 518.

[0095] In the above scheme, by setting up a first sub-cleaning device to clean the reactive substances on the surface of the first monitoring probe and a second sub-cleaning device to clean the reactive substances on the surface of the second monitoring probe, the reading deviation caused by the reactive substances on the surfaces of the first and second monitoring probes is reduced, the measurement accuracy is improved, and the defluorination ion treatment process can be controlled according to the measured fluoride content, thereby reducing the fluoride content in fluoride-containing wastewater and meeting the emission standards.

[0096] In summary, by installing filtration devices on the top sidewalls of the regulating tank and the coagulation tank, and connecting these filtration devices to the cleaning tank, the upper layer of fluoride-containing wastewater in the regulating tank and the coagulation tank is filtered into the corresponding connected cleaning tanks. This achieves the filtration of impurities in the fluoride-containing wastewater, thereby improving the accuracy of subsequent measurements of fluoride content in the wastewater. Furthermore, the fluoride-containing wastewater in the first and second sub-cleaning tanks is the upper layer of fluoride-containing wastewater from the regulating tank and the coagulation tank. Since this upper layer of fluoride-containing wastewater has already undergone one sedimentation, some impurities settle to the bottom of the regulating tank and the coagulation tank, further improving the medium stability of the fluoride-containing wastewater and enhancing the accuracy of subsequent measurements of fluoride content. This allows for the control of the defluorination ion treatment process based on the measured fluoride content, achieving a reduction in fluoride content in the wastewater and meeting emission standards.

[0097] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A fluorine-containing wastewater treatment system characterized by comprising: include: The reaction tank is suitable for containing fluoride-containing wastewater; A filtration device is fixed to the top side wall surface of the reaction tank and is connected to the side wall of the reaction tank. A cleaning tank is fixed to the bottom side wall surface of the reaction tank and is connected to the filtration device.

2. The fluorine-containing wastewater treatment system as claimed in claim 1, wherein The filtration device includes one or more combinations of a filter screen, a filter membrane, and an adsorption medium.

3. The fluorine-containing wastewater treatment system as claimed in claim 2, wherein The filter screen is made of polypropylene fiber or cotton, the filter membrane is made of polyvinylidene fluoride or polytetrafluoroethylene, and the adsorption medium is made of activated carbon.

4. The fluorine-containing wastewater treatment system as claimed in claim 1, wherein Also includes: A monitoring probe, which is suitable for measuring the fluoride content in fluoride-containing wastewater and obtaining a measurement value; A cleaning device is provided for cleaning the reactive substances on the surface of the monitoring probe.

5. The fluorine-containing wastewater treatment system as claimed in claim 4, wherein Also includes: A dosing device is mounted on the top of the reaction tank, and a portion of the dosing device is located inside the reaction tank. An automatic dosing control unit is adapted to adjust the dosage of the agent added to the reaction by the dosing device according to the measured value, until the fluoride ion concentration of the fluoride-containing wastewater after defluorination treatment reaches the target value, which is not greater than the discharge standard.

6. The fluorine-containing wastewater treatment system as claimed in claim 5, wherein The cleaning device is an aeration device, which includes: An air supply pipe is attached to the top of the cleaning tank, and a portion of the air supply pipe is located inside the cleaning tank. An aeration valve is provided to control the opening or closing of the passage within the air supply pipe. A compression unit, adapted to supply compressed gas into the gas supply pipe; The first control unit is adapted to control the opening or closing of the compression unit within a preset interval time. The first control unit is also adapted to control the opening or closing of the aeration valve according to the working state of the compression unit.

7. The fluorine-containing wastewater treatment system as claimed in claim 6, wherein The automatic dosing control unit is also adapted to adjust the first control unit to be turned on or off based on the measured value.

8. The fluorine-containing wastewater treatment system as claimed in claim 5, wherein The cleaning device is an ultrasonic device, and the ultrasonic device includes: An ultrasonic generator is suitable for converting electrical energy into high-frequency electrical signals; A transducer suitable for converting high-frequency electrical signals into mechanical vibrations, generating ultrasonic waves through the piezoelectric effect; The second control unit is adapted to control the ultrasonic generator to turn on or off within a preset interval.

9. The fluorine-containing wastewater treatment system as claimed in claim 8, wherein The automatic dosing control unit is also adapted to adjust the second control unit to be turned on or off based on the measured value.

10. The fluorine-containing wastewater treatment system as claimed in claim 6 or 8, wherein The preset interval time ranges from 12 hours to 24 hours.

11. The fluorine-containing wastewater treatment system as claimed in claim 4, wherein The reaction tank includes an adjustment tank and a coagulation tank; the filtration device includes a first sub-filtration device and a second sub-filtration device; the cleaning tank includes a first sub-cleaning tank and a second cleaning tank; and the washing device includes a first sub-washing device and a second washing device. The first sub-filter is fixed to the top side wall surface of the regulating tank, and the first sub-filter and the top side wall surface of the regulating tank are connected by a first connecting pipe. The first sub-cleaning tank is fixed to the bottom side wall surface of the adjustment tank, and the first sub-cleaning tank and the first sub-filter are connected by a second connecting pipe, with part of the first sub-cleaning device located inside the first sub-cleaning tank; The regulating tank and the coagulation tank are connected by a third connecting pipe; The second sub-filter is fixed to the top side wall surface of the coagulation tank, and the second sub-filter and the top side wall surface of the coagulation tank are connected by a fourth connecting pipe. The second sub-cleaning tank is fixed to the bottom side wall surface of the coagulation tank, and the second sub-cleaning tank and the second sub-filter are connected through the fifth connecting pipe, with part of the second sub-cleaning device located inside the second sub-cleaning tank.

12. The fluorine-containing wastewater treatment system as claimed in claim 11, wherein The first sub-cleaning tank and the first sub-filter are located on the left side of the regulating tank, and the second sub-cleaning tank and the second sub-filter are located on the left side of the coagulation tank, and the first sub-cleaning tank and the second sub-cleaning tank are either separately arranged or connected; or the first sub-cleaning tank and the first sub-filter are located on the left side of the regulating tank, and the second sub-cleaning tank and the second sub-filter are located on the right side of the coagulation tank, and the first sub-cleaning tank and the second sub-cleaning tank are either separately arranged or connected.

13. The fluorine-containing wastewater treatment system as claimed in claim 11, wherein Also includes: A first dosing device is mounted on the top of the regulating trough, and a portion of the first dosing device is located inside the regulating trough. The second dosing device is mounted on the top of the container, and a portion of the second dosing device is located inside the coagulation tank. The clear water tank and the coagulation tank are connected by a sixth connecting pipe.

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