Fluorine-containing wastewater treatment system

Abstract

The second high-density sedimentation tank is positioned at the downstream of the first high-density sedimentation tank; the sensor unit is configured to sense the pH value, the fluorine ion concentration and the turbidity of the wastewater; the agent adding unit is configured to add an acid-base agent, a coagulant and a flocculating agent into the wastewater; the first control system is used for controlling the fluorine-containing wastewater treatment system to operate in a first mode or a second mode; in the first mode, sludge of the first high-density sedimentation tank flows back to the first coagulation zone and / or the first flocculation zone from the first sedimentation zone, and sludge of the second high-density sedimentation tank flows back to the second coagulation zone and / or the second flocculation zone from the second sedimentation zone; and in the second mode, the sludge of the second high-density sedimentation tank flows back to the first coagulation zone and / or the first flocculation zone from the second sedimentation zone.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of fluorine-containing wastewater treatment systems, more specifically, a kind of fluorine-containing wastewater treatment system capable of more accurately control reagent dosage. BACKGROUND

[0002] For the treatment of fluorine-containing wastewater, it is necessary to remove fluoride and other pollutants in wastewater through the steps of coagulation, flocculation and sedimentation, so it is necessary to add coagulant, flocculant and reagent for adjusting pH to wastewater. But in the prior art, the amount of reagent addition is difficult to control accurately, if the amount of reagent addition is less, the water quality of effluent may not meet the corresponding standard, if the amount of reagent addition is more, it causes unnecessary increase in cost.

[0003] Therefore, it is desirable to propose a fluorine-containing wastewater treatment system to improve the above-mentioned defects in the prior art. SUMMARY

[0004] According to an aspect of the present application, a fluorine-containing wastewater treatment system is provided, comprising: a first high-density sedimentation tank comprising a first coagulation zone, a first flocculation zone and a first sedimentation zone in order from upstream to downstream; a second high-density sedimentation tank comprising a second coagulation zone, a second flocculation zone and a second sedimentation zone in order from upstream to downstream, the second high-density sedimentation tank being located downstream of the first high-density sedimentation tank; a sensor unit configured to sense the pH, fluoride ion concentration and turbidity of the wastewater; a reagent addition unit configured to add pH reagent, coagulant and flocculant to the wastewater; a first control system configured to control the fluorine-containing wastewater treatment system to operate in a first mode or a second mode in response to the sensing data of the sensor unit; in the first mode, the sludge of the first high-density sedimentation tank is backflowed from the first sedimentation zone to the first coagulation zone and / or the first flocculation zone, and the sludge of the second high-density sedimentation tank is backflowed from the second sedimentation zone to the second coagulation zone and / or the second flocculation zone; in the second mode, the sludge of the second high-density sedimentation tank is backflowed from the second sedimentation zone to the first coagulation zone and / or the first flocculation zone.

[0005] According to the scheme, the fluorine-containing wastewater treatment system can be operated in a more suitable mode according to the effluent water quality. When the effluent water quality has met the corresponding standard, the sludge of the second high-density sedimentation tank can be backflowed into the first high-density sedimentation tank to replace the coagulant and pH reagent added to the first high-density sedimentation tank, thereby reducing the cost of reagent consumption.

[0006] In some embodiments, the medicament dosing unit can include a first medicament dosing assembly and a second medicament dosing assembly, the first medicament dosing assembly being configured to dose the acid-base medicament and the coagulant into the first coagulation zone and dose the flocculant into the first flocculation zone; and the second medicament dosing assembly being configured to dose the acid-base medicament and the coagulant into the second coagulation zone and dose the flocculant into the second flocculation zone.

[0007] In some embodiments, in the second mode, the first medicament dosing assembly reduces the dosage of the coagulant into the first coagulation zone.

[0008] According to the embodiments, the dosage of the medicament can be minimized while ensuring the quality of the effluent.

[0009] In some embodiments, the fluorine-containing wastewater treatment system can further include a first sludge storage tank and a second sludge storage tank, the first sludge storage tank being connected to the first sedimentation zone, and the second sludge storage tank being connected to the second sedimentation zone, in the first mode, the sludge from the first sedimentation zone and the sludge from the second sedimentation zone are discharged into the first sludge storage tank and the second sludge storage tank respectively; and in the second mode, the sludge from the first sedimentation zone and the sludge from the second sedimentation zone are both discharged into the first sludge storage tank.

[0010] According to the embodiments, during the stable operation of the wastewater treatment system, the sludge from the first sedimentation zone and the second sedimentation zone can be discharged into the first sludge storage tank, thereby improving the efficiency of the sludge treatment.

[0011] In some embodiments, the first control system can be configured to operate the fluorine-containing wastewater treatment system in the second mode when the data sensed by the sensor unit indicates that the turbidity and / or the fluoride ion concentration of the wastewater downstream of the second high-density sedimentation tank are less than the predetermined threshold values.

[0012] According to the embodiments, when the quality of the effluent meets the corresponding standards, the wastewater treatment system is switched to the second mode, thereby ensuring the quality of the effluent and reducing the cost of the medicament.

[0013] In some embodiments, the fluorine-containing wastewater treatment system can further include a second control system, the second control system being configured to control the medicament dosing unit in response to the sensing data of the sensor unit, thereby controlling the dosage of the acid-base medicament, the coagulant and the flocculant.

[0014] According to the embodiments, the dosage of the medicament can be adjusted in real time according to the changes in the quality of the wastewater, thereby optimizing the medicament dosing scheme.

[0015] In some schemes, the second control system can be configured to adjust the dosage of the acid-base agent in response to the pH value in the wastewater being lower than a predetermined threshold value thereof, and / or the second control system can be configured to increase the dosage of the coagulant in response to the fluoride ion concentration in the wastewater being higher than a predetermined threshold value thereof, and / or the second control system can be configured to increase the dosage of the flocculant in response to the turbidity in the wastewater being higher than a predetermined threshold value thereof.

[0016] In some schemes, the sensor unit can include a first sensor assembly, a second sensor assembly and a third sensor assembly, the first sensor assembly sensing the pH value, the fluoride ion concentration and the turbidity of the wastewater upstream of the first high-density sedimentation tank, the second sensor assembly sensing the pH value, the fluoride ion concentration and the turbidity of the wastewater between the first high-density sedimentation tank and the second high-density sedimentation tank, and the third sensor assembly sensing the pH value, the fluoride ion concentration and the turbidity of the wastewater downstream of the second high-density sedimentation tank.

[0017] According to the scheme, by arranging the sensors at different positions, the water quality in each area of the fluorine-containing wastewater treatment system can be monitored in real time, so as to more accurately control the dosing scheme of the agents.

[0018] In some schemes, the sensor assembly can be configured to sense the pH value and the turbidity of the wastewater at a first frequency, and to sense the fluoride ion concentration of the wastewater at a second frequency, the first frequency being higher than the second frequency.

[0019] According to the scheme, appropriate sensing frequencies can be set for different measurements according to the characteristics of the measuring instruments, and mutual interference between the data signals can be avoided.

[0020] In some schemes, the acid-base agent can be sodium hydroxide or lime, and / or the coagulant can contain a defluorination agent, which is an aluminum-based agent (for example, polyaluminum chloride, aluminum sulfate, potassium aluminum sulfate, sodium aluminate), and / or the flocculant can be polyacrylamide (for example, cationic polyacrylamide). Among them, the aluminum-based agent can react with the fluoride ions in water to generate aluminum fluoride which is difficult to dissolve in water, so as to play a defluorination role while playing a coagulation role. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A schematic diagram of a fluorine-containing wastewater treatment system according to the present application is shown. DETAILED DESCRIPTION

[0022] In order to make the purpose, scheme and advantages of the technical scheme of the present application more clear, the technical scheme of the present application embodiment will be described clearly and completely in the following with reference to the drawings of the specific embodiments of the present application. Unless otherwise specified, the terms used herein have the usual meanings in the art. The same reference numerals in the drawings represent the same parts.

[0023] For the sake of clarity, unless otherwise expressly specified, the orientation terms appearing herein are defined as follows: upstream direction refers to the direction closer to the water inlet, and downstream direction refers to the direction closer to the water outlet.

[0024] Figure 1 A schematic diagram of the fluorine-containing wastewater treatment system according to the present application is shown, in which the fluorine-containing wastewater flows into the wastewater treatment system from the left side, sequentially passes through the first high-density sedimentation tank (relatively left side in the middle) and the second high-density sedimentation tank (relatively right side in the middle), and finally flows out of the wastewater treatment system from the right side. Figure 1 Figure 1

[0025] The first high-density sedimentation tank sequentially includes a coagulation zone A, a flocculation zone A and a sedimentation zone A from upstream to downstream, the wastewater undergoes coagulation in the coagulation zone A under the action of a coagulant (e.g., polyaluminum chloride) to convert the fluorine ions in the wastewater into aluminum fluoride complexes and to agglomerate other pollutants in the wastewater, undergoes flocculation in the flocculation zone A under the action of a flocculant (e.g., polyacrylamide) to make the aluminum fluoride complexes and other pollutants in the wastewater into larger flocs, and finally precipitates the water-insoluble flocs in the sedimentation zone A to achieve the effect of purifying the wastewater. Similarly, the second high-density sedimentation tank sequentially includes a coagulation zone B, a flocculation zone B and a sedimentation zone B from upstream to downstream, the wastewater undergoes coagulation in the coagulation zone B under the action of a coagulant (e.g., polyaluminum chloride) to remove the fluorine ions in the wastewater, undergoes flocculation in the flocculation zone B under the action of a flocculant (e.g., polyacrylamide) to remove the suspended solids in the wastewater, and finally precipitates the water-insoluble flocs in the sedimentation zone B to achieve the effect of purifying the wastewater. By sequentially adding the reagents, the corresponding chemical reactions are carried out in different zones to remove the fluorine ions and suspended solids contained in the wastewater, and mutual interference is avoided to improve the purification efficiency.

[0026] The first high-density sedimentation tank includes a first reagent adding assembly configured to add an acid-base reagent (e.g., sodium hydroxide) and a coagulant to the coagulation zone A, and to add a flocculant to the flocculation zone A. The acid-base reagent is used to adjust the pH of the wastewater, for example, when the pH of the wastewater is too low, the amount of sodium hydroxide can be increased, and vice versa. Similarly, the second high-density sedimentation tank includes a second reagent adding assembly configured to add an acid-base reagent (e.g., sodium hydroxide) and a coagulant to the coagulation zone B, and to add a flocculant to the flocculation zone B. The acid-base reagent is used to adjust the pH of the wastewater, for example, when the pH of the wastewater is too low, the amount of sodium hydroxide can be increased, and vice versa.

[0027] ​​The amount of reagent dosing is a key parameter for a wastewater treatment system. If the amount of reagent dosing is insufficient, the purification degree of wastewater can be insufficient, resulting in that the water quality of effluent does not meet the corresponding standard. If the amount of reagent dosing is too much, unnecessary cost increase will be caused. Therefore, it is necessary to optimize the reagent dosing scheme to reduce the cost of reagent dosing as much as possible while making the water quality of effluent meet the corresponding standard. For this purpose, the wastewater treatment system of the utility model comprises a sensor unit and a control system 1, the sensor unit is used for monitoring various parameters of wastewater, such as flow, turbidity, pH value and fluoride ion concentration, and the control system 1 controls the wastewater treatment system 1 to switch between the first mode and the second mode in response to the data monitored by the sensor unit.

[0028] In the first mode, pump a1 and pump b1 are opened and valve b6 is closed, so that the sludge of sedimentation zone A is refluxed to coagulation zone A (valve a1, valve a3 and valve a4 are opened, valve a2 is closed) or flocculation zone A (valve a2, valve a4 are opened, valve a3 is closed), and the sludge of sedimentation zone B is refluxed to coagulation zone B (valve b1, valve b3 and valve b4 are opened, valve b2 is closed) or flocculation zone B (valve b2, valve b4 are opened, valve b3 is closed). In other words, in the first mode, the sludge of the sedimentation zone A of the first high-density sedimentation tank and the sedimentation zone B of the second high-density sedimentation tank is refluxed to its respective coagulation zone or flocculation zone, so the first mode can also be called an internal reflux mode.

[0029] In the second mode, pump b1 is opened, valve b3, valve b4 and valve b6 are opened and valve b1 and valve b2 are closed, so that the sludge of sedimentation zone B of the second high-density sedimentation tank is refluxed to coagulation zone A (valve a1, valve a3 and valve a4 are opened, valve a2 is closed) or flocculation zone A (valve a2, valve a4 are opened, valve a3 is closed) of the first high-density sedimentation tank. Unlike the first mode, in the second mode, the sludge of the sedimentation zone B of the second high-density sedimentation tank is no longer refluxed to the second high-density sedimentation tank, but is refluxed to the first high-density sedimentation tank, so the second mode can also be called an external reflux mode. The sludge of the sedimentation zone contains the components of coagulant and flocculant, so refluxing the sludge can realize the recycling of coagulant and flocculant.

[0030] When the wastewater treatment system is just started to operate, the data monitored by the sensor unit indicates that the water quality of the effluent has not yet reached the standard (for example, the turbidity and the concentration of fluoride ions at the effluent are relatively high), the wastewater treatment system is operated in the internal reflux mode, and the first medicament dosing assembly and the second medicament dosing assembly normally dose the corresponding medicaments into the wastewater. When the wastewater treatment system is stable, the data monitored by the sensor unit indicates that the water quality of the effluent has reached the standard (for example, the turbidity and the concentration of fluoride ions at the effluent are relatively low), the wastewater treatment system can be switched from the internal reflux mode to the external reflux mode, and the first medicament dosing assembly reduces or stops dosing the acid-base medicament and the coagulant into the coagulation zone A. Because the water quality of the effluent has reached the standard, a large amount of coagulant is no longer needed to remove fluoride ions in the wastewater, so the dosing of the coagulant into the coagulation zone A can be stopped to save the medicament dosing cost. Because the coagulant is acidic in water, the dosing of the acid-base medicament for neutralizing the acidity can also be reduced or stopped accordingly, further saving the medicament dosing cost. Although a large amount of medicament is no longer needed to remove fluoride ions in the wastewater after the water quality of the effluent has reached the standard, a certain amount of medicament is still needed to remove fluoride ions in the wastewater, so the wastewater treatment system is switched to the external reflux mode to reflux the sludge containing the coagulant in the precipitation zone B to the coagulation zone A, so as to achieve a certain wastewater purification function with the residual coagulant and other effective components in the sludge.

[0031] In addition, the wastewater treatment system can further comprise a first sludge storage tank and a second sludge storage tank, the first sludge storage tank being connected to the coagulation zone A, and the second sludge storage tank being connected to the precipitation zone B. In the first mode, the sludge of the coagulation zone A and the sludge of the precipitation zone B are discharged to the first sludge storage tank and the second sludge storage tank respectively (i.e., both the pump a2 and the pump b2 are opened). In the second mode, the sludge of the coagulation zone A and the sludge of the precipitation zone B are both discharged to the first sludge storage tank (i.e., only the pump a2 is opened, and the pump b2 is closed). In this way, during the stable operation of the wastewater treatment system, the sludge of the coagulation zone A and the sludge of the precipitation zone B can be uniformly discharged to the first sludge storage tank, thereby improving the treatment efficiency of the discarded sludge.

[0032] In addition, on the basis of the control system 1, the wastewater treatment system can further comprise a control system 2, the control system 2 controlling the medicament dosing assembly in response to the data monitored by the sensor unit, so as to control the amount of medicament dosed. The control system 1 and the control system 2 can be separate elements, or can be integrated on the same element. The data monitored by the sensor can be first sent to the computer, and the computer generates instructions based on the received data and the algorithm stored therein to instruct the control system 1 and the control system 2 to perform corresponding operations.

[0033] Specifically, the sensor unit comprises a first sensor assembly, a second sensor assembly and a third sensor assembly. The first sensor assembly is configured to monitor the wastewater upstream of the first high-density sedimentation tank, the second sensor assembly is configured to monitor the wastewater between the first high-density sedimentation tank and the second high-density sedimentation tank, and the third sensor assembly is configured to monitor the wastewater downstream of the second high-density sedimentation tank. The first sensor assembly comprises a flow meter, a turbidity meter, a pH meter and a fluoride ion analyzer, which are respectively configured to monitor the flow rate, turbidity, pH and fluoride ion concentration of the wastewater. The second sensor assembly comprises a turbidity meter, a fluoride ion analyzer and a pH meter, which are respectively configured to monitor the turbidity, fluoride ion concentration and pH of the wastewater. The third sensor assembly comprises a turbidity meter and a fluoride ion analyzer, which are respectively configured to monitor the turbidity and fluoride ion concentration. In addition, the sensor unit can further comprise two additional pH meters, which are respectively configured to monitor the pH of the wastewater at the outlet of the coagulation zone A of the first high-density sedimentation tank and the outlet of the coagulation zone B of the second high-density sedimentation tank. It should be understood that, Figure 1 The arrangement of the sensors shown in FIG. 1 is only exemplary, and the present application is not intended to limit the specific arrangement of the sensors. Depending on the specific application requirements, sensors can be appropriately added or reduced in certain areas of the wastewater treatment system.

[0034] Specifically, the pH meter is configured to monitor the pH of the wastewater. It is beneficial for the purification of the wastewater if the wastewater has a suitable pH value. Therefore, if the pH meter monitors that the pH of the wastewater is too high, the control system 2 can be used to reduce the dosage of sodium hydroxide. Conversely, if the pH meter monitors that the pH of the wastewater is too low, the control system 2 can be used to increase the dosage of sodium hydroxide. Alternatively, the above-mentioned acid-base agent can also be acidic. In this case, if the pH meter monitors that the pH of the wastewater is too high, the control system 2 can be used to increase the dosage of the acidic acid-base agent, and vice versa. The above-mentioned suitable pH value can be obtained by theoretical calculation or computer modeling simulation analysis.

[0035] Specifically, the fluoride ion analyzer is configured to monitor the fluoride ion concentration of the wastewater. In order to make the water quality of the effluent meet the corresponding standards, the fluoride ion concentration should be as low as possible. The coagulant polyaluminum chloride can convert the fluoride ions in the wastewater into aluminum fluoride which is insoluble in water, so it also has the function of reducing the fluoride ion concentration in the wastewater. If the fluoride ion analyzer monitors that the fluoride ion concentration of the wastewater is too high, the control system 2 can be used to increase the dosage of the coagulant to continue to purify the fluoride ions in the wastewater. Conversely, if the fluoride ion analyzer monitors that the fluoride ion concentration of the wastewater is low, the control system 2 can be used to reduce the dosage of the coagulant to save the cost of the coagulant consumed. The threshold values defining high and low fluoride ion concentrations can be obtained by theoretical calculation or computer modeling simulation analysis.

[0036] Specifically, the turbidity meter is used to monitor the turbidity of the wastewater, and a high turbidity indicates that the wastewater is not sufficiently purified. If the turbidity meter monitors a high turbidity of the wastewater, the control system 2 can increase the dosage of the flocculant to continue purifying the wastewater. Conversely, if the turbidity meter monitors a low turbidity of the wastewater, the control system 2 can decrease the dosage of the flocculant to save the cost of the flocculant. The threshold values of the high turbidity and the low turbidity can be obtained by theoretical calculation or computer modeling simulation analysis.

[0037] In addition, because the pH, the fluoride ion concentration, and the pH of the wastewater are all affected by the acid-base agent, the coagulant, and the flocculant, the control system 2 can also determine the dosing scheme of the acid-base agent, the coagulant, and the flocculant based on the pH monitored by the pH meter, the fluoride ion concentration monitored by the fluoride ion analyzer, and the turbidity monitored by the turbidity meter. The dosing scheme specifically refers to the total amount of the three agents and the corresponding proportion of each agent. The algorithm of the above dosing scheme can be stored in a computer connected to the control system 2 to instruct the control system 2 to perform the above operations.

[0038] Specifically, because the measurement characteristics of the instruments are different, the collected data can be sent to the computer via different transmission paths. For example, the data monitored by the flow meter, the turbidity meter, and the pH meter can be transmitted to the computer via the first and third groups of signal collectors, and the data monitored by the fluoride ion analyzer can be transmitted to the computer via the second and fourth groups of signal collectors. Because the fluoride ion analyzer using the spectrophotometric method, for example, needs time for analysis and cannot achieve real-time monitoring, the monitoring frequency of the first and third groups of signal collectors can be higher than that of the second and fourth groups of signal collectors, for example, the first and third groups of signal collectors can be set to collect data once every minute, and the second and fourth groups of signal collectors can be set to collect data once every thirty minutes.

[0039] The various exemplary embodiments of the present application are described in detail herein with reference to the preferred embodiments, however, it is understood by those skilled in the art that various modifications and changes can be made to the above specific embodiments without departing from the concept of the present application, and various technical features and structures proposed by the present application can also be combined without exceeding the protection scope of the present application, and the protection scope of the present application is determined by the appended claims.

Claims

1. A fluorine-containing wastewater treatment system characterized by comprising: Comprise: a first high-density sedimentation tank comprising, from upstream to downstream, a first coagulation zone, a first flocculation zone and a first sedimentation zone; a second high-density sedimentation tank comprising, from upstream to downstream, a second coagulation zone, a second flocculation zone and a second sedimentation zone, the second high-density sedimentation tank being located downstream of the first high-density sedimentation tank; a sensor unit configured to sense the pH, the fluoride ion concentration and the turbidity of the wastewater; a medicament dosing unit configured to dose an acid-base medicament, a coagulant and a flocculant into the wastewater; a first control system configured to control the fluorine-containing wastewater treatment system to operate in a first mode or a second mode in response to the sensing data of the sensor unit; in the first mode, sludge of the first high-density sedimentation tank is backflowed from the first sedimentation zone to the first coagulation zone and / or the first flocculation zone, and sludge of the second high-density sedimentation tank is backflowed from the second sedimentation zone to the second coagulation zone and / or the second flocculation zone; in the second mode, sludge of the second high-density sedimentation tank is backflowed from the second sedimentation zone to the first coagulation zone and / or the first flocculation zone.

2. The fluorochemical wastewater treatment system of claim 1, wherein, the medicament dosing unit comprises a first medicament dosing assembly and a second medicament dosing assembly, the first medicament dosing assembly is configured to dose the acid-base medicament and the coagulant into the first coagulation zone, and to dose the flocculant into the first flocculation zone; the second medicament dosing assembly is configured to dose the acid-base medicament and the coagulant into the second coagulation zone, and to dose the flocculant into the second flocculation zone.

3. The fluorochemical wastewater treatment system of claim 2, wherein, in the second mode, the first medicament dosing assembly reduces the dosage of the coagulant into the wastewater in the first coagulation zone.

4. The fluorochemical wastewater treatment system of claim 3, wherein, further comprising a first sludge storage tank connected to the first sedimentation zone and a second sludge storage tank connected to the second sedimentation zone, in the first mode, sludge of the first sedimentation zone and sludge of the second sedimentation zone are discharged into the first sludge storage tank and the second sludge storage tank, respectively; in the second mode, sludge of the first sedimentation zone and sludge of the second sedimentation zone are both discharged into the first sludge storage tank.

5. The fluorine-containing wastewater treatment system according to claim 3, wherein the first control system is configured to cause the fluorine-containing wastewater treatment system to operate in the second mode when the data sensed by the sensor unit indicates that the turbidity and / or the fluoride ion concentration of the wastewater downstream of the second high-density sedimentation tank is less than a predetermined threshold thereof.

6. The fluorine-containing wastewater treatment system according to claim 1, wherein further comprising a second control system configured to control the medicament dosing unit in response to the sensing data of the sensor unit, thereby controlling the dosage of the acid-base medicament, the coagulant and the flocculant.

7. The fluorine-containing wastewater treatment system according to claim 6, wherein the second control system is configured to adjust the dosage of the acid-base medicament in response to the pH in the wastewater being lower than a predetermined threshold thereof, and / or the second control system is configured to increase the dosage of the coagulant in response to the fluoride ion concentration in the wastewater being higher than a predetermined threshold thereof, and / or the second control system is configured to increase the dosage of the flocculant in response to the turbidity in the wastewater being higher than a predetermined threshold thereof. The second control system is configured to increase the dosage of the flocculant in response to the turbidity in the wastewater being higher than a predetermined threshold thereof.

8. The fluorine-containing wastewater treatment system according to claim 1, wherein The sensor unit includes a first sensor assembly, a second sensor assembly, and a third sensor assembly, The first sensor assembly senses the pH, the fluoride ion concentration, and the turbidity of the wastewater upstream of the first high-density settling tank; The second sensor assembly senses the pH, the fluoride ion concentration, and the turbidity of the wastewater between the first high-density settling tank and the second high-density settling tank; The third sensor assembly senses the pH, the fluoride ion concentration, and the turbidity of the wastewater downstream of the second high-density settling tank.

9. The fluorine-containing wastewater treatment system according to claim 1, wherein The sensor unit is configured to sense the pH and the turbidity of the wastewater at a first frequency, and to sense the fluoride ion concentration of the wastewater at a second frequency, the first frequency being higher than the second frequency.

10. The fluorine-containing wastewater treatment system according to claim 1, wherein The acid-base agent is sodium hydroxide or lime, and / or The coagulant includes a fluoride removal agent.

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