A defluorination system of an industrial wastewater adsorption material

Abstract

The application relates to the technical field of wastewater treatment, in particular to a defluorination system of industrial wastewater adsorption material, which comprises a defluorination pretreatment module, a defluorination adsorption module, a water quality regulation and distribution module, a regeneration auxiliary module, a solid-liquid separation module and a control module. The defluorination pretreatment module, the defluorination adsorption module, the water quality regulation and distribution module, the regeneration auxiliary module, the solid-liquid separation module and the control module are organically combined together to form a complete treatment system, the modules are mutually cooperative and coordinated, the defluorination effect of the system is remarkable, the accuracy of water quality regulation is improved, the water quality is stable, and the dual demands of industrial production and environmental protection are met.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a defluorination system for industrial wastewater adsorption materials. Background Technology

[0002] With the rapid development of industrial production, the fluoride ion content in industrial wastewater discharged from industries such as electronics, metallurgy, and chemicals is prone to exceed the standard. If discharged directly without effective treatment, it will not only cause serious pollution to the ecological environment such as soil and water, and affect the growth of animals and plants, but may also harm human health through the food chain, causing diseases such as dental fluorosis and skeletal fluorosis.

[0003] Currently, industrial wastewater defluoridation systems widely employ technologies such as chemical precipitation, adsorption, and ion exchange. However, existing defluoridation systems have relatively independent treatment modules, lacking effective coordinated control, which leads to inaccurate water quality regulation. For example, in chemical precipitation, the inability to monitor and adjust the dosage in real time often results in wasted reagents or incomplete removal of fluoride ions.

[0004] Therefore, improving the accuracy of water quality control during industrial wastewater defluorination is an urgent problem to be solved. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention provides a defluorination system for industrial wastewater adsorption materials. This defluorination system includes a defluorination pretreatment module, a defluorination adsorption module, a water quality control and distribution module, a regeneration auxiliary module, a solid-liquid separation module, and a control module.

[0006] The outlet of the defluoridation pretreatment module is connected to the inlet of the defluoridation adsorption module. The defluoridation pretreatment module is used to pretreat the water to adjust the water quality and filter impurities, and then transports the pretreated water to the defluoridation adsorption module 2.

[0007] The outlet of the defluoridation adsorption module is connected to the inlet of the water quality control and distribution module and the inlet of the solid-liquid separation module, respectively. The defluoridation adsorption module is used to adsorb fluoride ions in the water.

[0008] The outlet of the water quality control and distribution module is connected to the inlet of the defluoridation pretreatment module and the inlet of the regeneration auxiliary module, respectively. The water quality control and distribution module is used to regulate the water quality and distribute the water flow to the defluoridation pretreatment module and the regeneration auxiliary module.

[0009] The outlet of the regeneration auxiliary module is connected to the inlet of the defluorination adsorption module. The regeneration auxiliary module is used to provide regeneration agents and backwash water to the defluorination adsorption module.

[0010] The outlet of the solid-liquid separation module is connected to the chemical sludge pipe. The solid-liquid separation module is used to remove fluoride-containing precipitates from the water, transport the fluoride-containing precipitates to the chemical sludge pipe, and transport the clear liquid after the removal of fluoride-containing precipitates to the front-end industrial pretreatment section.

[0011] The control module is connected to the defluoridation pretreatment module, water quality control and distribution module, regeneration auxiliary module, and solid-liquid separation module via signal transmission lines. It is used to control the amount of hydrochloric acid and sodium hydroxide added to the defluoridation system of the industrial wastewater adsorption material based on the target data collected by the target data acquisition devices in the defluoridation pretreatment module, water quality control and distribution module, regeneration auxiliary module, and solid-liquid separation module. This ensures that the water treated by the defluoridation pretreatment module, water quality control and distribution module, and solid-liquid separation module meets the acidity and alkalinity index, and that the water transported from the defluoridation adsorption module to the water quality control and distribution module meets the fluoride ion concentration index.

[0012] Compared with existing technologies, this invention has at least the following beneficial effects: The pretreatment module for defluorination pretreatment adjusts the water quality and filters impurities from industrial wastewater, creating more suitable treatment conditions for the subsequent defluorination adsorption module. The defluorination adsorption module utilizes the properties of the adsorbent material to adsorb fluoride ions in the water, effectively reducing the concentration of fluoride ions in the wastewater and helping to reduce environmental pollution and the impact on subsequent production processes. The water quality control and distribution module further adjusts the water quality after treatment by the defluorination adsorption module and rationally distributes the water flow to the pretreatment module for recycling, improving water resource utilization efficiency, or to the regeneration auxiliary module, providing necessary conditions for the regeneration of the defluorination adsorption module and ensuring coordinated operation between all modules of the system, thus optimizing the entire defluorination system process. The regeneration auxiliary module provides regeneration agents and backwash water to the defluorination adsorption module, allowing the adsorbent material to recover its adsorption performance after adsorption saturation through regeneration, extending the service life of the adsorbent material. This system reduces operating costs by effectively removing fluoride precipitates from water through a solid-liquid separation module. The precipitates are then transported to a chemical sludge pipe for further treatment, preventing secondary pollution of the environment. Simultaneously, the clarified liquid after fluoride removal is transported to the upstream industrial pretreatment section, achieving water resource recycling and improving water resource utilization. The control module continuously receives target data from the target data acquisition equipment, analyzes the operating status and water quality of the entire defluorination system, and adjusts the addition of hydrochloric acid and sodium hydroxide, the influent flow rate, and the regenerated liquid flow rate to regulate the defluorination effect. By organically combining multiple functional modules such as defluorination pretreatment, adsorption, water quality control, regeneration assistance, solid-liquid separation, and control, a complete treatment system is formed. These modules cooperate and coordinate with each other to efficiently treat fluoride ions in industrial wastewater, resulting in significant defluorination effects, stable effluent quality, and meeting the dual needs of industrial production and environmental protection. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A schematic diagram of a fluoride removal system for industrial wastewater adsorption materials provided in an embodiment of the present invention;

[0015] Figure 2 A schematic diagram of a defluorination pretreatment module in a defluorination system for industrial wastewater adsorption materials provided in an embodiment of the present invention;

[0016] Figure 3 A schematic diagram of a defluorination adsorption module in a defluorination system for industrial wastewater adsorption materials provided in an embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram of a water quality control and distribution module in a defluorination system of an industrial wastewater adsorption material provided in an embodiment of the present invention;

[0018] Figure 5 A schematic diagram of a regeneration auxiliary module in a fluoride removal system for an industrial wastewater adsorption material provided in an embodiment of the present invention;

[0019] Figure 6 A schematic diagram of a solid-liquid separation module in a fluoride removal system for an industrial wastewater adsorption material provided in an embodiment of the present invention;

[0020] Figure Descriptions: 1. Defluoridation Pretreatment Module; 2. Defluoridation Adsorption Module; 3. Water Quality Control and Distribution Module; 4. Regeneration Auxiliary Module; 5. Solid-Liquid Separation Module; 6. Control Module; 11. MBR Permeate Tank; 12. Defluoridation Inlet Pump; 13. Hydrochloric Acid Dosing Electric Valve; 14. First Pipeline Mixer; 15. Security Filter; 16. First Liquid Level Sensor; 17. First pH Meter; 18. Target Electromagnetic Flow Meter; 21. Defluoridation Adsorption Tank; 22. First Electromagnetic Flow Meter; 31. First Sodium Hydroxide Electric Valve; 32. Second Pipeline Mixer; 33. Return to MBR Permeate Tank Valve; 34. To Backwash Water Intake Tank Valve; 37. Permeate Valve; 35. Second pH Meter; 36. Fluoride Ion Meter; 41. Backwash Water Intake Tank; 42. Fluoride Fluoride Meter. Pump 43 is a slow wash pump, 44 is a regeneration agent dissolution tank water replenishment pump, 45 is a regeneration agent dissolution tank, 46 is a regeneration agent dissolution tank outlet pneumatic valve, 47 is a regeneration agent storage tank, 48 is a regeneration agent lift pump, 49 is a second liquid level sensor, 410 is a third liquid level sensor, 411 is a fourth liquid level sensor, 412 is a second electromagnetic flow meter, 413 is a third electromagnetic flow meter, 51 is a regeneration waste liquid storage tank, 52 is a regeneration waste liquid lift pump, 53 is a second sodium hydroxide electric valve, 54 is an integrated reaction tank, 55 is an integrated sedimentation tank, 56 is a pneumatic diaphragm sludge pump, 57 is an integrated clear liquid tank, 58 is a clear liquid tank lift pump, 59 is a third pH meter, 511 is a fifth liquid level sensor, and 512 is a sixth liquid level sensor. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be understood that the invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, for clarity, the dimensions and relative dimensions of layers and regions may be exaggerated. The same reference numerals denote the same elements throughout.

[0023] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this invention, the first element, component, area, layer, or portion discussed below may be referred to as the second element, component, area, layer, or portion.

[0024] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein for convenience of description to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, then the element or feature described as “below,” “under,” or “below” other elements or features will be oriented “above” other elements or features. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or otherwise) and the spatial descriptive terms used herein will be interpreted accordingly.

[0025] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. When used herein, the singular forms “a,” “an,” and “ / the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “comprising,” when used in this specification, identify the presence of features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0026] To fully understand this invention, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this invention. Preferred embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0027] This embodiment provides a fluoride removal system for industrial wastewater adsorption materials, such as... Figure 1 As shown, it includes a defluoridation pretreatment module 1, a defluoridation adsorption module 2, a water quality regulation and distribution module 3, a regeneration auxiliary module 4, a solid-liquid separation module 5, and a control module 6.

[0028] The outlet of the defluoridation pretreatment module 1 is connected to the inlet of the defluoridation adsorption module 2. The defluoridation pretreatment module 1 is used to pretreat the water to adjust the water quality and filter impurities, and then transports the pretreated water to the defluoridation adsorption module 2.

[0029] The outlet of the defluoridation adsorption module 2 is connected to the inlet of the water quality control and distribution module 3 and the inlet of the solid-liquid separation module 5, respectively. The defluoridation adsorption module 2 is used to adsorb fluoride ions in the water.

[0030] The outlet of the water quality regulation and distribution module 3 is connected to the inlet of the defluoridation pretreatment module 1 and the inlet of the regeneration auxiliary module 4, respectively. The water quality regulation and distribution module 3 is used to regulate the water quality and distribute the water flow to the defluoridation pretreatment module 1 and the regeneration auxiliary module 4.

[0031] The outlet of the regeneration auxiliary module 4 is connected to the inlet of the defluorination adsorption module 2. The regeneration auxiliary module 4 is used to provide regeneration agents and backwash water to the defluorination adsorption module 2.

[0032] The outlet of the solid-liquid separation module 5 is connected to the chemical sludge pipe. The solid-liquid separation module 5 is used to remove fluoride-containing precipitates from the water, transport the fluoride-containing precipitates to the chemical sludge pipe, and transport the clear liquid after the removal of fluoride-containing precipitates to the front-end industrial pretreatment section.

[0033] The control module 6 is connected to the defluoridation pretreatment module 1, water quality control and distribution module 3, regeneration auxiliary module 4, and solid-liquid separation module 5 via signal transmission lines. It is used to control the amount of hydrochloric acid and sodium hydroxide added to the defluoridation system of the industrial wastewater adsorption material based on the target data collected by the target data acquisition devices in the defluoridation pretreatment module 1, water quality control and distribution module 3, regeneration auxiliary module 4, and solid-liquid separation module 5. This ensures that the water treated by the defluoridation pretreatment module 1, water quality control and distribution module 3, and solid-liquid separation module 5 meets the acidity and alkalinity index, and that the water delivered from the defluoridation adsorption module 2 to the water quality control and distribution module 3 meets the fluoride ion concentration index.

[0034] The defluoridation pretreatment module 1 can adjust the water quality parameters of the wastewater, such as pH and temperature, to bring them within a suitable range for the subsequent defluoridation adsorption module. Simultaneously, a filtration device removes large particulate impurities and suspended solids from the wastewater, preventing these impurities from entering the defluoridation adsorption module and affecting the adsorption effect or clogging the adsorption material.

[0035] The fluoride removal adsorption module 2 utilizes specific adsorption materials to adsorb fluoride ions in wastewater. These adsorption materials possess unique surface structures and chemical properties, enabling them to undergo physical or chemical adsorption reactions with fluoride ions, transferring them from the water to the surface of the adsorption material and thus reducing the concentration of fluoride ions in the water.

[0036] The water quality control and distribution module 3 further tests and adjusts the water quality after passing through the defluoridation adsorption module to ensure it meets requirements. Then, based on the operating status and needs of the defluoridation system, it rationally distributes the water flow to the defluoridation pretreatment module for recycling, and to the regeneration auxiliary module to provide the necessary conditions for the regeneration of the defluoridation adsorption module. The water quality control and distribution module can also allocate water to subsequent processes to meet the needs of later treatment or reuse, ensuring the continuity and efficiency of the entire industrial wastewater treatment process.

[0037] The regeneration auxiliary module 4 can prepare and supply regeneration agents to the defluorination adsorption module. These agents react with fluoride ions adsorbed on the adsorbent material, causing the fluoride ions to desorb from the material and restoring its adsorption performance. Simultaneously, it provides backwash water to the defluorination adsorption module. The rinsing action of the water flow removes any impurities that may have remained on the surface of the adsorbent material during adsorption, further improving the regeneration effect and ensuring the material can continuously and effectively adsorb fluoride ions.

[0038] Solid-liquid separation module 5 utilizes solid-liquid separation technologies such as sedimentation, filtration, and centrifugation to separate fluoride-containing precipitates from the clarified liquid in the water. The fluoride-containing precipitates are transported to the chemical sludge pipe for further treatment, while the separated clarified liquid is transported to the upstream industrial pretreatment section. This ensures the clarity of the effluent, reduces the impact of suspended solids and other impurities on subsequent processes or reuse, facilitates further treatment or reuse, and achieves the recycling of water resources.

[0039] Control module 6 is connected to defluoridation pretreatment module 1, water quality control and distribution module 3, regeneration auxiliary module 4, and solid-liquid separation module 5 via signal transmission lines. Figure 1 Solid lines and arrows indicate the connections between modules and the flow of water between them, while dashed lines indicate the signal transmission lines between modules.

[0040] The control module 6 continuously receives target data collected by the target data acquisition device, such as pH, flow rate, and fluoride ion concentration, thereby grasping the operating status and water quality of the entire defluorination system. This data serves as the basis for subsequent control, adjusting the amount of hydrochloric acid and sodium hydroxide added to the defluorination system, controlling the influent flow rate, and regulating the regenerated liquid flow rate to adjust the defluorination effect of the defluorination system.

[0041] In one specific implementation, such as Figure 2As shown, the defluoridation pretreatment module 1 includes an MBR permeate tank 11, a defluoridation inlet pump 12, a hydrochloric acid dosing electric valve 13, a first pipeline mixer 14, a security filter 15, a first liquid level sensor 16, a first pH meter 17, and a target electromagnetic flow meter 18.

[0042] The outlet of the MBR permeate tank 11 is connected to the inlet of the defluoridation inlet pump 12. The outlet of the defluoridation inlet pump 12 and the outlet of the hydrochloric acid dosing electric valve 13 are connected to the inlet of the first pipeline mixer 14. The MBR permeate tank 11 is used to store water treated by the MBR and water distributed by the water quality control and distribution module 3. The water in the MBR permeate tank 11 is transported to the first pipeline mixer 14 by the defluoridation inlet pump 12. The hydrochloric acid dosing electric valve 13 is used to control the amount of hydrochloric acid added.

[0043] The outlet of the first pipeline mixer 14 is connected to the inlet of the security filter 15. The first pipeline mixer 14 is used to mix hydrochloric acid with the water output from the defluoridation inlet pump 12.

[0044] The outlet of the security filter 15 is connected to the inlet of the defluorination adsorption module 2. The security filter 15 is used to filter impurities.

[0045] The target electromagnetic flowmeter 18 is installed in the outlet pipe of the defluoridation inlet pump 12 to measure the amount of water entering the defluoridation adsorption module 2.

[0046] The first liquid level sensor 16 is installed in the MBR permeate tank 11 to monitor the liquid level of the MBR permeate tank 11.

[0047] The first pH meter 17 is installed at the outlet of the first pipeline mixer 14 to monitor the acidity or alkalinity of the water at the outlet of the first pipeline mixer 14 after adjustment with hydrochloric acid.

[0048] Among them, the defluoridated water inlet pump 12 serves as a power device. It can overcome pipeline resistance by operating the pump and lift the water in the MBR product water tank 11 at a certain pressure and flow rate and deliver it to the first pipeline mixer 14.

[0049] The target electromagnetic flowmeter 18 is installed in the outlet pipe of the defluorination inlet pump 12. It works based on the principle of electromagnetic induction. When water flows in the pipe, it cuts the magnetic lines of force and generates an induced electromotive force. The induced electromotive force is proportional to the water flow velocity. By measuring the magnitude of the induced electromotive force, the amount of water entering the defluorination adsorption module 2 can be calculated. The amount of water entering the module can then be adjusted according to the processing capacity and needs of the defluorination system, that is, the amount of water for subsequent defluorination treatment and pH adjustment can be adjusted to ensure that the amount of water entering the subsequent treatment stage is within the processing capacity of the defluorination system.

[0050] The hydrochloric acid dosing electric valve 13 precisely controls the addition time and amount of hydrochloric acid according to the received instructions, so as to adjust the pH of the water and create suitable conditions for subsequent defluorination adsorption.

[0051] The first pipeline mixer 14 utilizes its internal structure to ensure that hydrochloric acid and the water output from the defluorination inlet pump 12 are fully mixed in the pipeline through the flow of water and the disturbance of the internal components of the mixer, thereby achieving effective regulation of the acidity and alkalinity of the water.

[0052] The security filter 15 uses a filter medium (such as a filter element) to filter water after pH adjustment, removing fine particulate impurities, suspended solids, colloids, etc. from the water, preventing impurities from entering the defluorination adsorption module 2 and affecting the performance and adsorption effect of the adsorption material, while also protecting the normal operation of downstream equipment.

[0053] The first liquid level sensor 16 is installed in the MBR permeate tank 11 to monitor the liquid level in the MBR permeate tank 11 in real time. It can control the start and stop of the defluoridation inlet pump 12, adjust the water quality control and distribution module 3, etc., and provide a data basis for monitoring the operation of the defluoridation system.

[0054] The first pH meter 17 is installed at the outlet of the first pipeline mixer 14. It can contact water through electrodes and measure the acidity or alkalinity of the water after hydrochloric acid adjustment by utilizing the response of the electrodes to the hydrogen ion concentration in the solution.

[0055] In one specific implementation, such as Figure 3 As shown, the defluorination adsorption module 2 includes M defluorination adsorption tanks 21 and M first electromagnetic flowmeters 22. Taking M=5 as an example, the diagram is provided.

[0056] Among them, M defluorination adsorption tanks 21 are connected in sequence by pipes, and each first electromagnetic flowmeter 22 is installed on the pipe of the corresponding defluorination adsorption tank 21 to measure the flow rate of water flowing through the pipe into the corresponding defluorination adsorption tank 21.

[0057] The inlet of each defluoridation adsorption tank 21 is connected to the outlet of the defluoridation pretreatment module 1, and the outlet of each defluoridation adsorption tank 21 is connected to the inlet of the water quality control and distribution module 3 and the inlet of the solid-liquid separation module 5. Each defluoridation adsorption tank 21 is used to adsorb fluoride ions in the water through the adsorbent inside the defluoridation adsorption tank 21.

[0058] The defluoridation adsorption tank is filled with a specialized adsorbent possessing unique physical and chemical properties that allow it to adsorb fluoride ions from the water. When water containing fluoride ions flows from the defluoridation pretreatment module 1 into the defluoridation adsorption tank 21, the adsorbent adsorbs the fluoride ions onto its surface or into its internal pores through mechanisms such as ion exchange, surface complexation, and physical adsorption, thereby reducing the concentration of fluoride ions in the water and achieving the purpose of defluoridation. Multiple defluoridation adsorption tanks 21 are connected sequentially by pipes, allowing water to pass through each tank in turn, further improving the defluoridation effect.

[0059] After adsorbing fluoride ions for a period of time, the adsorption sites of the adsorbent in the defluorination adsorption tank 21 are gradually occupied by fluoride ions, resulting in a decrease in adsorption capacity. The regeneration agent desorbs the fluoride ions from the adsorbent through a chemical reaction or ion exchange with the fluoride ions on the surface and in the internal pores of the adsorbent. This re-exposes the active sites of the adsorbent, restoring it to a good adsorption state so that it can effectively adsorb fluoride ions from the water again. This extends the lifespan of the adsorbent, reduces the frequency of adsorbent replacement, ensures the stable operation of the defluorination system, and lowers operating costs.

[0060] The first electromagnetic flowmeter 22 works based on the principle of electromagnetic induction. When water flows in the pipe, it cuts the magnetic lines of force and generates an induced electromotive force. The induced electromotive force is proportional to the water flow velocity. It can measure the flow rate of water flowing through the pipe into the corresponding defluorination adsorption tank 21, providing a data basis for monitoring the operation of the defluorination system.

[0061] In one specific implementation, such as Figure 4 As shown, the water quality control and distribution module 3 includes a first sodium hydroxide electric valve 31, a second pipeline mixer 32, a return valve to the MBR product water tank 33, a return valve to the backwash water intake tank 34, a product water valve 37, a second pH meter 35, and a fluoride ion meter 36.

[0062] The inlet of the second pipeline mixer 32 is connected to the outlet of the defluorination adsorption module 2 and the outlet of the first sodium hydroxide electric valve 31. The first sodium hydroxide electric valve 31 is used to control the amount of sodium hydroxide added, and the second pipeline mixer 32 is used to mix sodium hydroxide with the water output from the defluorination adsorption module 2.

[0063] The second pH meter 35 and the fluoride ion meter 36 are installed at the outlet of the second pipeline mixer 32. The second pH meter 35 is used to monitor the acidity or alkalinity of the water at the outlet of the second pipeline mixer 32 after adjustment with sodium hydroxide, and the fluoride ion meter 36 is used to monitor the fluoride ion concentration in the water at the outlet of the second pipeline mixer 32.

[0064] The outlet of the second pipeline mixer 32 is connected to the inlet of the return MBR permeate tank valve 33, the inlet of the backwash water intake tank valve 34, and the inlet of the permeate valve 37. The return MBR permeate tank valve 33 is used to control the amount of water flowing back to the MBR permeate tank 11 in the defluorination pretreatment module 1, the backwash water intake tank valve 34 is used to control the amount of water transported to the backwash water intake tank 41 in the regeneration auxiliary module 4, and the permeate valve 37 is used to control the amount of water transported to the downstream process.

[0065] Among them, the first sodium hydroxide electric valve 31 can precisely adjust the opening degree and opening time, thereby accurately controlling the amount of sodium hydroxide added and adjusting the pH of the water output by the defluorination adsorption module 2 to a suitable range to meet the requirements of subsequent treatment processes.

[0066] The fluoride ion meter 36, based on the specific response of a fluoride ion selective electrode to fluoride ions, can monitor the fluoride ion concentration in the water at the outlet of the second pipeline mixer 32. Specifically, the fluoride ion selective electrode is inserted into the water together with the reference electrode. Different potential differences are generated in solutions with different fluoride ion concentrations. The potential difference is converted into the corresponding fluoride ion concentration value using the Nernst equation and displayed. This can be used to determine whether the defluorination effect meets the requirements and to determine the subsequent water flow direction.

[0067] When the fluoride ion concentration detected by the fluoride ion meter 36 is high, or the acidity or alkalinity displayed by the second pH meter 35 does not meet the requirements, the control module will control the opening of the MBR permeate tank valve 33 to return some water to the MBR permeate tank 11 in the defluorination pretreatment module 1 for defluorination treatment again to ensure that the effluent water quality meets the standards.

[0068] When it is necessary to backwash the adsorbent in the defluorination adsorption tank 21, the backwash water intake valve 34 is opened to transport water that has been regulated to the regeneration auxiliary module 4, providing the necessary water source for the regeneration of the adsorbent. At the same time, the amount and frequency of water transported can be adjusted according to the needs of backwashing.

[0069] In one specific implementation, such as Figure 5 As shown, the regeneration auxiliary module 4 includes a backwash water intake tank 41, a flushing pump 42, a slow wash pump 43, a regeneration agent dissolution tank makeup water pump 44, a regeneration agent dissolution tank 45, a regeneration agent dissolution tank outlet pneumatic valve 46, a regeneration agent storage tank 47, a regeneration agent lift pump 48, a second liquid level sensor 49, a third liquid level sensor 410, a fourth liquid level sensor 411, a second electromagnetic flow meter 412, and a third electromagnetic flow meter 413.

[0070] The inlet of the backwash water intake tank 41 is connected to the outlet of the backwash water intake tank valve 34. The backwash water intake tank 41 is used to store water distributed from the water quality control and distribution module 3, and to provide water source for the backwashing of the defluoridation adsorption tank 21 and the replenishment of the regeneration agent dissolution tank 45.

[0071] The outlet of the backwash water intake tank 41 is connected to the inlet of the flushing pump 42, the inlet of the slow wash pump 43, and the inlet of the regeneration agent dissolution tank makeup water pump 44. The flushing pump 42 and the slow wash pump 43 are used to draw water from the backwash water intake tank 41 and provide flushing power for the defluorination adsorption tank 21.

[0072] The outlet of the regeneration agent dissolving tank makeup water pump 44 is connected to the inlet of the regeneration agent dissolving tank 45. The regeneration agent dissolving tank makeup water pump 44 is used to draw water from the backwash water intake tank 41 to the regeneration agent dissolving tank 45.

[0073] The outlet of the regenerative agent dissolving tank 45 is connected to the inlet of the regenerative agent dissolving tank outlet pneumatic valve 46. The regenerative agent dissolving tank 45 is used to dissolve the regenerative agent into a regenerative solution.

[0074] The outlet of the pneumatic valve 46 of the regenerating agent dissolving tank is connected to the inlet of the regenerating agent storage tank 47. The pneumatic valve 46 of the regenerating agent dissolving tank is used to control the regenerated liquid transported from the regenerating agent dissolving tank 45 to the regenerating agent storage tank 47.

[0075] The outlet of the regenerative agent storage tank 47 is connected to the inlet of the regenerative agent booster pump 48, and the regenerative agent storage tank 47 is used to store the regenerative liquid.

[0076] The outlet of the regeneration agent booster pump 48, the outlet of the flushing pump 42, and the outlet of the slow wash pump 43 are connected to the inlet of each defluorination adsorption tank 21. The regeneration agent booster pump 48 is used to draw the regeneration liquid in the regeneration agent storage tank 47 into the defluorination adsorption tank 21.

[0077] The second liquid level sensor 49 is installed in the backwash water intake tank 41 to monitor the liquid level of the backwash water intake tank 41.

[0078] The third liquid level sensor 410 is installed in the regenerated agent dissolving tank 45 to monitor the liquid level in the regenerated agent dissolving tank 45.

[0079] The fourth liquid level sensor 411 is installed in the regenerative agent storage tank 47 to monitor the liquid level of the regenerative agent storage tank 47.

[0080] The second electromagnetic flow meter 412 is installed in the outlet pipes of the flushing pump 42 and the slow wash pump 43 to measure the flow rate of water entering the defluorination adsorption tank 21 from the flushing pump 42 and the slow wash pump 43.

[0081] The third electromagnetic flowmeter 413 is installed in the outlet pipe corresponding to the regeneration agent booster pump 48 and is used to measure the flow rate of the regeneration liquid entering the defluorination adsorption tank 21 from the regeneration agent booster pump 48.

[0082] The flushing pump 42 typically provides a high water velocity and flow rate for quickly flushing impurities from the defluorination adsorption tank 21. The slow-wash pump 43 provides a relatively low water velocity and flow rate for a gentler cleaning process to avoid excessive impact on the adsorbent.

[0083] The regenerative agent dissolving tank 45 can mix solid or concentrated regenerative agents with water, and fully dissolve the regenerative agents through stirring or other methods to form a regenerative solution. A third liquid level sensor 410 is installed in it to monitor the liquid level of the regenerative agent dissolving tank 45 in real time. When the liquid level of the regenerative agent dissolving tank 45 is too low, the regenerative agent dissolving tank water pump 44 can be started to replenish water. When the liquid level of the regenerative agent dissolving tank 45 reaches the set value, water replenishment is stopped.

[0084] Once the regenerated solution has dissolved and meets the requirements, the pneumatic valve 46 of the regenerated agent dissolution tank opens, transporting the regenerated solution to the regenerated agent storage tank 47. The fourth liquid level sensor 411 monitors the liquid level in the regenerated agent storage tank 47. When the liquid level in the regenerated agent storage tank 47 is too low, the regenerated solution can be replenished by opening the pneumatic valve 46 of the regenerated agent dissolution tank.

[0085] The second electromagnetic flow meter 412 is installed in the outlet pipes of the flushing pump 42 and the slow wash pump 43. It can measure the flow rate of water entering the defluorination adsorption tank 21 for flushing based on the principle of electromagnetic induction, so as to monitor the flushing situation.

[0086] The third electromagnetic flowmeter 413 is installed in the outlet pipe corresponding to the regeneration agent booster pump 48 to measure the flow rate of the regenerated liquid entering the defluorination adsorption tank 21. By controlling the value of the third electromagnetic flowmeter 413, the flow rate of the regenerated liquid entering the defluorination adsorption tank 21 can be controlled, thereby controlling the defluorination effect.

[0087] In one specific implementation, such as Figure 6 As shown, the solid-liquid separation module 5 includes a regenerated waste liquid storage tank 51, a regenerated waste liquid lift pump 52, a second sodium hydroxide electric valve 53, an integrated reaction tank 54, an integrated sedimentation tank 55, a pneumatic diaphragm sludge pump 56, an integrated clear liquid tank 57, a clear liquid tank lift pump 58, a third pH meter 59, a fifth liquid level sensor 511, and a sixth liquid level sensor 512.

[0088] The inlet of the regenerated waste liquid storage tank 51 is connected to the outlet of the defluorination adsorption module 2, and the outlet of the regenerated waste liquid storage tank 51 is connected to the inlet of the regenerated waste liquid booster pump 52. The regenerated waste liquid storage tank 51 is used to store the waste liquid generated during the regeneration process of the defluorination adsorption tank 21.

[0089] The outlet of the regenerated waste liquid lift pump 52 and the outlet of the second sodium hydroxide electric valve 53 are connected to the inlet of the integrated reaction tank 54. The regenerated waste liquid lift pump 52 is used to extract waste liquid from the regenerated waste liquid storage tank 51 into the integrated reaction tank 54. The second sodium hydroxide electric valve 53 is used to control the amount of sodium hydroxide added to the integrated reaction tank 54.

[0090] The outlet of the integrated reaction tank 54 is connected to the inlet of the integrated sedimentation tank 55. Polyacrylamide is also added to the integrated reaction tank 54. The integrated reaction tank 54 is used to react with fluoride ions in the waste liquid through sodium hydroxide and polyacrylamide, and generate fluoride-containing precipitates in the integrated sedimentation tank 55.

[0091] The outlet of the integrated sedimentation tank 55 is connected to the inlet of the pneumatic diaphragm sludge pump 56 and the inlet of the integrated clear liquid tank 57. The outlet of the pneumatic diaphragm sludge pump 56 is connected to the chemical sludge pipe. The pneumatic diaphragm sludge pump 56 is used to transport the fluoride-containing precipitate in the integrated sedimentation tank 55 to the chemical sludge pipe.

[0092] The outlet of the integrated clear liquid tank 57 is connected to the clear liquid tank lift pump 58. The integrated clear liquid tank 57 is used to store the clear liquid after removing fluoride precipitates. The clear liquid tank lift pump 58 is used to transport the clear liquid stored in the integrated clear liquid tank 57 to the front-end industrial pretreatment section.

[0093] A third pH meter 59 is installed in the integrated reaction tank 54 to monitor the pH of the water in the integrated reaction tank 54 after adjustment with sodium hydroxide and polyacrylamide.

[0094] The fifth liquid level sensor 511 is installed in the regenerated waste liquid storage tank 51 to monitor the liquid level of the regenerated waste liquid storage tank 51.

[0095] The sixth liquid level sensor 512 is installed in the integrated clear liquid tank 57 to monitor the liquid level of the integrated clear liquid tank 57.

[0096] The regenerated waste liquid storage tank 51 can receive and temporarily store the waste liquid generated during the regeneration process of the defluorination adsorption tank 21 to buffer the flow rate of the waste liquid and prevent it from directly entering the subsequent treatment unit and causing a shock. The fifth liquid level sensor 511 monitors the liquid level of the regenerated waste liquid storage tank 51 in real time. When the liquid level of the regenerated waste liquid storage tank 51 reaches a certain height, it can provide a start signal for subsequent treatment. When the liquid level of the regenerated waste liquid storage tank 51 is too low, it can prompt relevant operations or check for abnormalities.

[0097] The second sodium hydroxide electric valve 53 can control the time and amount of sodium hydroxide added to the integrated reaction tank 54. By adjusting the addition of sodium hydroxide, the pH of the water after the reaction is changed, creating suitable chemical reaction conditions for subsequent combined action with polyacrylamide to remove fluoride ions.

[0098] In addition to sodium hydroxide added through the second sodium hydroxide electric valve 53, polyacrylamide is also added to the integrated reaction tank 54. Sodium hydroxide reacts chemically with fluoride ions in the waste liquid to form insoluble fluoride precipitates. Polyacrylamide, acting as a flocculant, causes fine precipitate particles to aggregate into larger flocs, facilitating subsequent sedimentation and separation. A third pH meter 59 monitors the pH of the water in real time during the reaction process. By adjusting the operating status of the second sodium hydroxide electric valve 53, the pH of the water can be adjusted to ensure that the post-reaction water maintains a suitable pH.

[0099] The integrated sedimentation tank 55 receives the mixed liquid flowing out of the integrated reaction tank 54. Utilizing the principle of gravity settling, fluoride-containing precipitates settle in the tank. Suction and pressure are generated by the reciprocating motion of a pneumatic diaphragm, enabling the suction and transport of sludge. The upper layer of the integrated sedimentation tank 55 forms a clearer liquid, which is then transported to the integrated clear liquid tank 57. A sixth level sensor 512 monitors the liquid level in the integrated clear liquid tank 57. When the liquid level in the integrated clear liquid tank 57 reaches a certain height, the clear liquid tank lift pump 58 can be activated to transport the clear liquid. When the liquid level in the integrated clear liquid tank 57 is too low, it can prompt relevant operations or indicate whether there is an abnormality.

[0100] In one specific embodiment, the control module 6 includes a processor and a memory storing a computer program. When the computer program is executed by the processor, the following steps are performed:

[0101] S1, acquire the target data set collected by the target data acquisition devices in the defluoridation pretreatment module 1, water quality control and distribution module 3, regeneration auxiliary module 4, and solid-liquid separation module 5 from the tjth preset time point to the tth preset time point. The target data acquisition devices include a target electromagnetic flowmeter 18, a hydrochloric acid dosing electric valve 13, a first pH meter 17, a first sodium hydroxide electric valve 31, a second pH meter 35, a second sodium hydroxide electric valve 53, a third pH meter 59, a third electromagnetic flowmeter 413, and a fluoride ion meter 36. The target data in the target data set are arranged in chronological order, and each target data includes the value of the first target parameter at the corresponding preset time point and the value of the second target parameter at the corresponding preset time point. The first target parameters include the first pH value corresponding to the first pH meter 17, the second pH value corresponding to the second pH meter 35, the third pH value corresponding to the third pH meter 59, and the fluoride ion concentration corresponding to the fluoride ion meter 36. The second target parameters include the influent flow rate corresponding to the target electromagnetic flow meter 18, the hydrochloric acid addition amount corresponding to the hydrochloric acid dosing electric valve 13, the first sodium hydroxide addition amount corresponding to the first sodium hydroxide electric valve 31, the second sodium hydroxide addition amount corresponding to the second sodium hydroxide electric valve 53, and the regenerated liquid flow rate corresponding to the third electromagnetic flow meter 413. t is an integer greater than j, where j is the data time span parameter, representing the number of preset time points traced back from the preset time point t, used to determine the time range of the target data input into the trained first prediction model.

[0102] S2, input the target data set corresponding to the tj-th preset time point to the t-th preset time point into the trained first prediction model, and obtain the prediction data of the first target parameter corresponding to the t+1 preset time point.

[0103] S3, input the target data set corresponding to the tj-th preset time point to the t-th preset time point into the trained distribution prediction model corresponding to the second target parameter, and obtain the reference distribution function of the second target parameter at the (t+1)-th preset time point.

[0104] S4, randomly sample the reference distribution function corresponding to the second target parameter at the (t+1)th preset time point to obtain the reference value of the second target parameter at the (t+1)th preset time point.

[0105] S5, take the predicted data of the first target parameter at the (t+1)th preset time point and the reference value of the second target parameter at the (t+1)th preset time point as the reference data at the (t+1)th preset time point.

[0106] S6, input the target data set corresponding to the (t-j+1)th preset time point to the tth preset time point and the reference data corresponding to the (t+1)th preset time point into the trained first prediction model, and obtain the prediction data of the first target parameter corresponding to the (t+2)th preset time point.

[0107] S7. If the predicted data of the first target parameter at the (t+2)th preset time point meets the target condition, then the control quantity of the second target parameter at the (t+1)th preset time point is determined according to the reference value of the second target parameter at the (t+1)th preset time point. The control quantity includes the control of the influent flow rate, the amount of hydrochloric acid added, the amount of the first sodium hydroxide added, the amount of the second sodium hydroxide added, and the regenerated liquid flow rate.

[0108] S8, based on the control quantity corresponding to the second target parameter at the (t+1)th preset time point, controls the influent flow rate, hydrochloric acid addition amount, first sodium hydroxide addition amount, second sodium hydroxide addition amount, and regenerated liquid flow rate when the actual time reaches the (t+1)th preset time point.

[0109] Among them, the first pH meter 17 monitors the acidity and alkalinity of the water at the outlet of the first pipeline mixer 14 in real time, the target electromagnetic flow meter 18 measures the influent flow into the defluorination adsorption module 2, the third electromagnetic flow meter 413 measures the regenerated liquid flow into the defluorination adsorption tank 21, the fluoride ion meter 36 monitors the fluoride ion concentration, the second pH meter 35 monitors the acidity and alkalinity of the water at the outlet of the second pipeline mixer 32, and the third pH meter 59 monitors the acidity and alkalinity of the water in the integrated reaction tank 54.

[0110] If the pH of the water at the outlet of the first pipeline mixer 14 does not meet the treatment requirements of the preset pH reference range corresponding to the defluorination pretreatment module 1, the control module will send a control signal to the hydrochloric acid dosing electric valve 13 to adjust the addition time and amount of hydrochloric acid so that the pH of the water at the outlet of the first pipeline mixer 14 meets the requirements of the preset pH reference range.

[0111] If the fluoride ion concentration monitored by the fluoride ion meter 36 does not meet the preset fluoride ion concentration reference range, the control module 6 can adjust the operating parameters of the defluorination inlet pump 12 and the regeneration agent booster pump 48, thereby adjusting the inlet water volume into the defluorination adsorption module 2 to ensure that the water volume entering the subsequent treatment stage is within the treatment capacity of the defluorination system, and adjusting the regeneration liquid flow rate into the defluorination adsorption tank 21 to ensure that the defluorination system can maintain a good defluorination effect and that the fluoride ion concentration reaches the predetermined standard.

[0112] If the pH of the water at the outlet of the second pipeline mixer 32 does not meet the treatment requirements of the preset pH reference range corresponding to the water quality control and distribution module 3, the control module can send a command to the first sodium hydroxide electric valve 31 to control the amount and time of sodium hydroxide addition, so that the pH of the water at the outlet of the second pipeline mixer 32 reaches the predetermined standard.

[0113] If the pH of the water in the integrated reaction tank 54 does not meet the processing requirements of the preset pH reference range corresponding to the solid-liquid separation module 5, the control module can send a command to the second sodium hydroxide electric valve 53 to control the amount and time of sodium hydroxide addition, so that the pH of the water in the integrated reaction tank 54 reaches the predetermined standard.

[0114] Therefore, the second target parameter is the parameter object controlled and adjusted by the control module, and the first target parameter is the water quality parameter that changes after the control module controls and adjusts the second parameter.

[0115] Specifically, in order to accurately predict and control the operating status of the defluorination system, it is necessary to collect relevant data over a period of time. By acquiring the target data from the tj-th preset time point to the t-th preset time point, the dynamic changes of the defluorination system during this period can be understood, providing a data foundation for subsequent prediction and control.

[0116] A preset time point refers to a pre-set time node for data collection and control.

[0117] The first prediction model refers to a trained machine learning or deep learning model used to predict the value of the first target parameter at a future preset time point based on historical target data. The distribution prediction model is used to predict the probability distribution of the possible values ​​of each parameter in the second target parameter at a future preset time point, obtaining the corresponding reference distribution function. The values ​​of the second target parameter represented by the reference distribution function can guarantee the stability of the corresponding first pH value, second pH value, and third pH value, as well as the fluoride ion concentration, within the required range.

[0118] By randomly sampling the reference distribution function corresponding to the second target parameter at the (t+1)th preset time point, and selecting a specific value from the probability distribution as the reference value of the second target parameter at that time point, a benchmark for subsequent control can be provided, taking into account the uncertainty of the second target parameter.

[0119] The predicted data of the first target parameter at the (t+1)th preset time point and the reference value of the second target parameter at that time point are combined to form the reference data at the (t+1)th preset time point, which contains predictive information about the system's operating state at a future time point. Then, the historical target data set from the (t-j+1)th preset time point to the tth preset time point and the reference data at the (t+1)th preset time point are used as inputs and fed back into the trained first prediction model to predict the value of the first target parameter at the (t+2)th preset time point. This allows for further consideration of the impact of the prediction at the (t+1)th preset time point on the subsequent first target parameter.

[0120] Based on the reference value of the second target parameter at the (t+1)th preset time point and the actual value of the second target parameter at the tth preset time point, the differences between each parameter in the second target parameter are determined and used as the control quantity at the (t+1)th preset time point. This ensures that when the control quantity is obtained based on the reference value, and the influent flow rate, hydrochloric acid addition amount, first sodium hydroxide addition amount, second sodium hydroxide addition amount, and regenerated liquid flow rate are controlled using the control quantity, the first pH value, second pH value, third pH value, and fluoride ion concentration can meet the requirements.

[0121] If the predicted data of the first target parameter at the (t+2)th preset time point meets the target conditions, it indicates that controlling the system based on the reference value of the second target parameter at the (t+1)th preset time point may enable the system to reach the desired operating state in the future. Therefore, based on the control quantity of the second target parameter at the (t+1)th preset time point, the specific values ​​of the influent flow rate, hydrochloric acid addition, first sodium hydroxide addition, second sodium hydroxide addition, and regenerated liquid flow rate in the defluorination system are controlled to optimize and control the system's operating state in advance, ensuring that the first pH value, second pH value, third pH value, and fluoride ion concentration meet the requirements.

[0122] The first prediction model and the distribution prediction model can be obtained by collecting historical data related to the defluorination system.

[0123] In one specific implementation, the training process of the first prediction model includes the following steps:

[0124] The historical data of the target data acquisition device at each historical time point is obtained. The historical data includes the values ​​of the first target parameter and the second target parameter at the corresponding historical time point.

[0125] The historical data set consisting of historical data corresponding to the i-th historical time point to the (i+j)-th historical time point is input into the initial prediction model to obtain the historical prediction data of the first target parameter corresponding to the (i+j+1)-th historical time point, where i=1,2,...,Mj-1, and M is the total number of preset time points.

[0126] The training sub-loss is calculated based on the historical data corresponding to the (i+j+1)th historical time point and the historical prediction data of the first target parameter corresponding to the (i+j+1)th historical time point.

[0127] Iterate through i=1,2,...,Mj-1, sum the losses of all training sub-losses to determine the total training loss, and update the parameters of the initial prediction model according to the total training loss until the total training loss converges, thus obtaining the first prediction model that has been trained.

[0128] In this method, historical data collected by the target acquisition device within a historical time period is used as training data. The model loss during training is measured based on the difference between the historical predicted data and the corresponding actual historical data for each parameter in the first target parameters, thereby optimizing the parameters of the initial prediction model and improving the prediction accuracy of the first prediction model.

[0129] In one specific implementation, the training process of the distribution prediction model includes the following steps:

[0130] For the historical data set consisting of historical data corresponding to the i-th historical time point to the (i+j)-th historical time point, calculate the first fluctuation degree corresponding to the first pH value, the second fluctuation degree corresponding to the second pH value, the third fluctuation degree corresponding to the third pH value, and the offset degree corresponding to the fluoride ion concentration in the current historical data set.

[0131] If the first fluctuation level, the second fluctuation level, and the third fluctuation level are all less than the preset fluctuation level threshold, and the offset level is less than the preset offset level threshold, then the current historical data set is determined as the sample data set.

[0132] Iterate through i=, 2, ..., Mj-1 to obtain the complete set of sample data.

[0133] For any set of sample data, the current set of sample data is input into the initial distribution prediction model corresponding to each second objective parameter, and the predicted mean parameter and predicted variance parameter corresponding to each second objective parameter are obtained.

[0134] For any second target parameter, based on the predicted mean parameter, predicted variance parameter and random sampled value corresponding to the current second target parameter, the sampling result corresponding to the current second target parameter is obtained, where the sampling result = predicted mean parameter + random sampled value × predicted variance parameter, and the random sampled value is randomly sampled from the standard normal distribution.

[0135] Iterate through all the second target parameters and obtain the sampling result corresponding to each second target parameter.

[0136] Based on the sampling results corresponding to all second target parameters and the values ​​corresponding to all first target parameters in the historical data at the (i+j+1)th historical time point, reference data corresponding to the (i+j+1)th historical time point is formed.

[0137] The historical data corresponding to the (i+1)th historical time point to the (i+j)th historical time point and the reference data corresponding to the (i+j+1)th historical time point are input into the trained first prediction model to obtain the intermediate data of the first target parameter corresponding to the (i+j+1)th historical time point. The intermediate data includes the intermediate values ​​of the first pH value, the second pH value, the third pH value and the fluoride ion concentration.

[0138] For each first objective parameter, the distributed sub-loss corresponding to the current first objective parameter is obtained from the historical data corresponding to the (i+1)th historical time point to the (i+j)th historical time point and the intermediate data corresponding to the (i+j+1)th historical time point.

[0139] Iterate through all the first objective parameters, sum the distribution sub-losses corresponding to all the first objective parameters, determine the total distribution loss, and train the initial distribution prediction model corresponding to each second objective parameter based on the total distribution loss to obtain the trained distribution prediction model corresponding to each second objective parameter.

[0140] Specifically, based on the first pH value in the first target parameter, j+1 values ​​corresponding to the first pH value are obtained from the historical data corresponding to the i-th to the (i+j)-th historical time points. The variance among the j+1 values ​​is calculated as the first fluctuation degree corresponding to the first pH value. The second and third fluctuation degrees are calculated in the same way.

[0141] Based on the first pH value of fluoride ion concentration in the first target parameter, obtain j+1 values ​​corresponding to the fluoride ion concentration from the historical data corresponding to the i-th historical time point to the i+j-th historical time point. Calculate the difference between j+1 values ​​and the upper and lower limits of the preset fluoride ion concentration benchmark range, and take the average of 2×(j+1) differences as the offset degree corresponding to the fluoride ion concentration.

[0142] The specific values ​​of the preset fluctuation threshold and preset offset threshold can be set by the implementer based on historical experience and actual conditions. By using the preset fluctuation threshold and preset offset threshold, time periods with relatively stable data characteristics that meet the fluoride ion concentration index are selected as sample data for subsequent training of the distribution prediction model, thus avoiding interference from excessive data fluctuations in model training.

[0143] The initial distribution prediction model analyzes each second objective parameter based on the input sample data and outputs the corresponding predicted mean parameter and predicted variance parameter to describe the distribution characteristics of the second objective parameter. The mean represents the average level of the second objective parameter, and the variance represents the degree of dispersion of the second objective parameter.

[0144] By using the predicted mean parameter, the predicted variance parameter, and random sampled values ​​to simulate the possible values ​​of the second objective parameter, the distribution characteristics and randomness of the second objective parameter are comprehensively considered, which increases the randomness of the distribution prediction model and its adaptability to different situations.

[0145] By combining the sampling results of the second target parameter with the actual values ​​of the first target parameter at the corresponding historical time points, a reference data containing all parameter information is formed, providing more comprehensive data support including actual values ​​and sampling results for subsequent model training.

[0146] Based on a combination of historical and reference data, the trained first prediction model is used to predict the value of the first target parameter at the (i+j+1)th historical time point.

[0147] Then, based on the historical data from the (i+1)th to the (i+j)th historical time point and the intermediate data from the (i+j+1)th historical time point, the variance is calculated for the (j+1)th values ​​corresponding to the first pH value. This variance is used as the distribution sub-loss for the first pH value. The same applies to the second and third pH values. Furthermore, the difference between the fluoride ion concentration values ​​from the intermediate data corresponding to the (i+j+1)th historical time point and the upper and lower limits of the preset fluoride ion concentration baseline range is calculated, and the average of these differences is used as the distribution sub-loss for the fluoride ion concentration.

[0148] This allows us to obtain the total distributed loss and update the distributed prediction function to obtain the trained distributed prediction model corresponding to each second objective parameter. This enables the model to more accurately predict the value of the second objective parameter at future time points and ensures that the first objective parameter meets the objective conditions based on the value.

[0149] The above-mentioned multi-dimensional parameter analysis, combined with distribution prediction, makes the control values ​​of each secondary target parameter more reliable and effective, thereby ensuring the stability of pH value and that the fluoride ion concentration meets the requirements, and improving the accuracy and timeliness of multi-dimensional control.

[0150] In one specific embodiment, the predicted data for the first target parameter at the (t+2)th preset time point includes a first predicted pH value, a second predicted pH value, a third predicted pH value, and a predicted fluoride ion concentration. S7 includes the following steps:

[0151] The predicted data for the first target parameter at the (t+2)th preset time point include the first predicted pH value, the second predicted pH value, the third predicted pH value, and the predicted fluoride ion concentration. S7 includes the following steps:

[0152] S71, based on the first preset pH reference range and the first predicted pH value corresponding to the (t+2)th preset time point, obtain the first parameter deviation degree corresponding to the (t+2)th preset time point.

[0153] S72, based on the second preset pH reference range and the second predicted pH value corresponding to the (t+2)th preset time point, obtain the degree of deviation of the second parameter corresponding to the (t+2)th preset time point.

[0154] S73, based on the third preset pH reference range and the third predicted pH value corresponding to the (t+2)th preset time point, obtain the degree of deviation of the third parameter corresponding to the (t+2)th preset time point.

[0155] S74. Based on the preset deviation threshold and the deviation of the first parameter, the deviation of the second parameter, and the deviation of the third parameter corresponding to the (t+2)th preset time point, a first judgment result is obtained, wherein the first judgment result includes meeting the first target condition and not meeting the first target condition.

[0156] S75, based on the preset fluoride ion concentration baseline range and the predicted fluoride ion concentration corresponding to the (t+2)th preset time point, obtain the second judgment result corresponding to the (t+2)th preset time point, wherein the second judgment result includes meeting the second target condition and not meeting the second target condition.

[0157] S76, if the first judgment result is that the first target condition is met and the second judgment result is that the second target condition is met, then the predicted data of the first target parameter at the (t+2)th preset time point is determined to meet the target condition.

[0158] The first preset pH reference range is a pre-defined reasonable range for the first pH value corresponding to the first pH table. This first preset pH reference range is the reasonable range that the first pH value should be at the (t+2)th preset time point. By comparing the first predicted pH value at the (t+2)th preset time point with the first preset pH reference range, the degree to which the predicted value deviates from the reference range is calculated, resulting in the first parameter deviation degree, which measures the difference between the predicted first pH value at future time points and the expected reasonable range. The second and third parameter deviation degrees are calculated similarly.

[0159] The preset deviation threshold is a pre-defined standard for measuring whether the deviation of a parameter is acceptable. The deviations of the first, second, and third parameters at the (t+2)th preset time point are compared with the preset deviation threshold. If the deviations of all three parameters are within the threshold range, the first target condition is considered met. Otherwise, the first target condition is considered not met, thus obtaining the first judgment result, which is used to comprehensively evaluate whether the three pH value predictions meet the overall target condition.

[0160] The preset fluoride ion concentration benchmark range is a pre-defined reasonable range of fluoride ion concentration values ​​corresponding to the fluoride ion meter, i.e., the reasonable range that the fluoride ion concentration should be within. This range is used to determine whether the predicted fluoride ion concentration meets the requirements. The predicted fluoride ion concentration at the (t+2)th preset time point is compared with the preset fluoride ion concentration benchmark range to determine whether the predicted fluoride ion concentration is within this range. If it is within the range, the second target condition is met. Otherwise, the second target condition is not met, thus obtaining a second judgment result, used to separately evaluate whether the predicted fluoride ion concentration meets the target condition.

[0161] Combining the first and second judgment results, only when the first judgment result meets the first target condition and the second judgment result meets the second target condition can it be determined that the predicted data of the first target parameter at the (t+2)th preset time point meets the target condition.

[0162] The above describes how the defluoridation pretreatment module regulates the water quality and filters impurities from industrial wastewater, creating more suitable treatment conditions for the subsequent defluoridation adsorption module. The defluoridation adsorption module utilizes the properties of the adsorbent material to adsorb fluoride ions in the water, effectively reducing the concentration of fluoride ions in the wastewater. This helps reduce environmental pollution and the impact on subsequent production processes. The water quality control and distribution module further regulates the water treated by the defluoridation adsorption module and rationally distributes the water flow to the defluoridation pretreatment module for recycling, improving water resource utilization efficiency. Alternatively, it distributes the water to the regeneration auxiliary module, providing necessary conditions for the regeneration of the defluoridation adsorption module and ensuring coordinated operation between all modules. This optimizes the entire defluoridation system's process flow. The regeneration auxiliary module provides regeneration agents and backwash water to the defluoridation adsorption module, allowing the adsorbent material to recover its adsorption performance after adsorption saturation, extending its service life, and reducing operating costs. The solid-liquid separation module effectively removes fluoride precipitates from the water, transporting them to a chemical sludge pipe for further treatment, thus preventing secondary pollution. Simultaneously, the clarified liquid after fluoride removal is sent to the upstream industrial pretreatment section, achieving water resource recycling and improving water resource utilization. The control module continuously receives target data from the target data acquisition equipment, analyzes the overall operating status and water quality of the defluorination system, and adjusts the addition of hydrochloric acid and sodium hydroxide, the influent flow rate, and the regenerated liquid flow rate to regulate the defluorination effect. By organically combining multiple functional modules such as defluorination pretreatment, adsorption, water quality control, regeneration assistance, solid-liquid separation, and control, a complete treatment system is formed. These modules cooperate and coordinate with each other to efficiently treat fluoride ions in industrial wastewater, resulting in significant defluorination effects, stable effluent quality, and meeting the dual requirements of industrial production and environmental protection.

[0163] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A defluorination system of an industrial wastewater adsorbent material, characterized by, The defluorination system of the industrial wastewater adsorption material comprises a defluorination pretreatment module, a defluorination adsorption module, a water quality regulation and distribution module, a regeneration auxiliary module, a solid-liquid separation module and a control module. The outlet of the defluorination pretreatment module is connected to the inlet of the defluorination adsorption module, and the defluorination pretreatment module is used for pretreatment of adjusting water quality and filtering impurities, and delivering the pretreated water to the defluorination adsorption module. The outlet of the defluorination adsorption module is connected to the inlet of the water quality regulation and distribution module and the inlet of the solid-liquid separation module, and the defluorination adsorption module is used for adsorbing fluorine ions in water. The outlet of the water quality regulation and distribution module is connected to the inlet of the defluorination pretreatment module and the inlet of the regeneration auxiliary module, and the water quality regulation and distribution module is used for adjusting water quality and distributing water flow to the defluorination pretreatment module and the regeneration auxiliary module. The outlet of the regeneration auxiliary module is connected to the inlet of the defluorination adsorption module, and the regeneration auxiliary module is used for providing the defluorination adsorption module with regeneration reagents and backwashing water. The outlet of the solid-liquid separation module is connected to a chemical sludge pipe, and the solid-liquid separation module is used for removing fluorine-containing precipitates in water, delivering the fluorine-containing precipitates to the chemical sludge pipe, and delivering clear liquid after removing the fluorine-containing precipitates to the front industrial pretreatment section. The control module is connected to the defluorination pretreatment module, the water quality regulation and distribution module, the regeneration auxiliary module and the solid-liquid separation module through a signal transmission line, and is used for controlling the addition amount of hydrochloric acid and sodium hydroxide added in the defluorination system of the industrial wastewater adsorption material according to target data collected by a target data acquisition device in the defluorination pretreatment module, the water quality regulation and distribution module, the regeneration auxiliary module and the solid-liquid separation module, so that the water processed by the defluorination pretreatment module, the water quality regulation and distribution module and the solid-liquid separation module meets the pH index, and the water delivered by the defluorination adsorption module to the water quality regulation and distribution module meets the fluorine ion concentration index. The control module comprises a processor and a memory storing a computer program, and when the computer program is executed by the processor, the following steps are realized: S1, obtaining target data sets collected by target data acquisition devices in the fluoride removal pretreatment module, the water quality regulation and distribution module, the regeneration auxiliary module, and the solid-liquid separation module at the t-jth preset time point to the tth preset time point, wherein the target data acquisition devices include a target electromagnetic flowmeter, a hydrochloric acid dosing electric valve, a first pH meter, a first sodium hydroxide electric valve, a second pH meter, a second sodium hydroxide electric valve, a third pH meter, a third electromagnetic flowmeter, and a fluoride ion meter, the target data in the target data sets are arranged in chronological order, each target data includes a corresponding value of a first target parameter at a corresponding preset time point and a corresponding value of a second target parameter at the corresponding preset time point, the first target parameter is a water quality parameter that changes after the control module controls and adjusts the second target parameter, and includes a first pH value corresponding to the first pH meter, a second pH value corresponding to the second pH meter, a third pH value corresponding to the third pH meter, and a fluoride ion concentration corresponding to the fluoride ion meter, the second target parameter is a parameter object controlled and adjusted by the control module, and includes a water inflow corresponding to the target electromagnetic flowmeter, a hydrochloric acid addition amount corresponding to the hydrochloric acid dosing electric valve, a first sodium hydroxide addition amount corresponding to the first sodium hydroxide electric valve, a second sodium hydroxide addition amount corresponding to the second sodium hydroxide electric valve, and a regeneration liquid flow corresponding to the third electromagnetic flowmeter, t is an integer greater than j, j is a data time span parameter, j represents the number of preset time points traced back from the preset time point t, and is used to determine the time range of the target data input into the trained first prediction model; S2, inputting the target data sets corresponding to the t-jth preset time point to the tth preset time point into the trained first prediction model, and obtaining predicted data of the first target parameter corresponding to the t+1th preset time point; S3, inputting the target data sets corresponding to the t-jth preset time point to the tth preset time point into the trained distribution prediction model corresponding to the second target parameter, and obtaining a reference distribution function of the second target parameter corresponding to the t+1th preset time point; S4, randomly sampling the reference distribution function of the second target parameter corresponding to the t+1th preset time point, and obtaining a reference value of the second target parameter corresponding to the t+1th preset time point; S5, taking the predicted data of the first target parameter corresponding to the t+1th preset time point and the reference value of the second target parameter corresponding to the t+1th preset time point as reference data corresponding to the t+1th preset time point; S6, inputting the target data sets corresponding to the t-j+1th preset time point to the tth preset time point and the reference data corresponding to the t+1th preset time point into the trained first prediction model, and obtaining predicted data of the first target parameter corresponding to the t+2th preset time point; S7, if the first target parameter satisfies the target condition at the t+2th preset time point, determining a control amount of the second target parameter at the t+1th preset time point according to a reference value of the second target parameter at the t+1th preset time point, wherein the control amount includes control of the water inflow, the hydrochloric acid addition amount, the first sodium hydroxide addition amount, the second sodium hydroxide addition amount and the regeneration liquid flow rate; S8, controlling the water inflow, the hydrochloric acid addition amount, the first sodium hydroxide addition amount, the second sodium hydroxide addition amount and the regeneration liquid flow rate according to the control amount of the second target parameter at the t+1th preset time point when the actual time reaches the t+1th preset time point.

2. The defluorination system of industrial wastewater adsorbent material according to claim 1, characterized by, The fluoride removal pretreatment module includes an MBR water tank, a fluoride removal water pump, a hydrochloric acid dosing electric valve, a first pipeline mixer, a security filter, a first liquid level sensor, a first pH meter and a target electromagnetic flowmeter; The outlet of the MBR water tank is connected to the inlet of the fluoride removal water pump, the outlet of the fluoride removal water pump and the outlet of the hydrochloric acid dosing electric valve are connected to the inlet of the first pipeline mixer, the MBR water tank is used to store water treated by MBR and water distributed by the water quality control and distribution module, and the MBR water tank is used to transport water in the MBR water tank to the first pipeline mixer through the fluoride removal water pump, and the hydrochloric acid dosing electric valve is used to control the addition amount of hydrochloric acid. The outlet of the first pipeline mixer is connected to the inlet of the security filter, and the first pipeline mixer is used to mix hydrochloric acid and water output by the fluoride removal water pump. The outlet of the security filter is connected to the inlet of the fluoride removal adsorption module, and the security filter is used to filter impurities. The target electromagnetic flowmeter is installed in the outlet pipe of the fluoride removal water pump and is used to measure the water inflow into the fluoride removal adsorption module. The first liquid level sensor is installed in the MBR water tank and is used to monitor the liquid level of the MBR water tank. The first pH meter is installed at the outlet of the first pipeline mixer and is used to monitor the pH of water at the outlet of the first pipeline mixer after adjustment by hydrochloric acid.

3. The defluorination system of industrial wastewater adsorbent material according to claim 2, characterized by, The fluoride removal adsorption module includes M fluoride removal adsorption tanks and M first electromagnetic flowmeters. The M fluoride removal adsorption tanks are connected in sequence by pipes, and each first electromagnetic flowmeter is installed on the pipe of a corresponding fluoride removal adsorption tank and is used to measure the flow rate of water flowing through the pipe into the corresponding fluoride removal adsorption tank. The inlet of each fluoride removal adsorption tank is connected to the outlet of the fluoride removal pretreatment module, the outlet of each fluoride removal adsorption tank is connected to the inlet of the water quality control and distribution module and the inlet of the solid-liquid separation module, and each fluoride removal adsorption tank is used to adsorb fluoride ions in water by an adsorbent in the fluoride removal adsorption tank.

4. The defluorination system of industrial wastewater adsorbent material according to claim 3, characterized by, The water quality control and distribution module includes a first sodium hydroxide electric valve, a second pipeline mixer, a back-to-MBR water tank valve, a back-to-backwash water tank valve, a water production valve, a second pH meter and a fluoride ion meter. The second pipeline mixer is connected with the outlet of the fluoride removal adsorption module and the outlet of the first sodium hydroxide electric valve, and is used for mixing sodium hydroxide with water output by the fluoride removal adsorption module. The second pH meter and the fluoride ion meter are installed at the outlet of the second pipeline mixer, and are used for monitoring the pH value of water at the outlet of the second pipeline mixer and the fluoride ion concentration in the water at the outlet of the second pipeline mixer. The outlet of the second pipeline mixer is connected with the inlet of the MBR product water tank valve, the inlet of the backwash water tank valve and the inlet of the product water valve.

5. The defluorination system of industrial wastewater adsorbent material according to claim 4, characterized by, The regeneration auxiliary module comprises a backwash water tank, a flushing pump, a slow washing pump, a regeneration reagent dissolving tank water supplement pump, a regeneration reagent dissolving tank, a regeneration reagent dissolving tank outlet pneumatic valve, a regeneration reagent storage tank, a regeneration reagent lifting pump, a second liquid level sensor, a third liquid level sensor, a fourth liquid level sensor, a second electromagnetic flowmeter and a third electromagnetic flowmeter. The inlet of the backwash water tank is connected with the outlet of the backwash water tank valve, and the backwash water tank is used for storing water distributed by the water quality regulation and distribution module and providing water sources for backwashing of the fluoride removal adsorption tank and water supplement of the regeneration reagent dissolving tank. The outlet of the backwash water tank is connected with the inlet of the flushing pump, the inlet of the slow washing pump and the inlet of the regeneration reagent dissolving tank water supplement pump. The outlet of the regeneration reagent dissolving tank water supplement pump is connected with the inlet of the regeneration reagent dissolving tank. The outlet of the regeneration reagent dissolving tank is connected with the inlet of the regeneration reagent dissolving tank outlet pneumatic valve. The outlet of the regeneration reagent dissolving tank outlet pneumatic valve is connected with the inlet of the regeneration reagent storage tank. The outlet of the regeneration reagent storage tank is connected with the inlet of the regeneration reagent lifting pump. The outlet of the regeneration reagent lifting pump, the outlet of the flushing pump and the outlet of the slow washing pump are connected with the inlets of the fluoride removal adsorption tanks. The second liquid level sensor is installed in the backwash water tank and is used for monitoring the liquid level of the backwash water tank. The third liquid level sensor is installed in the regeneration reagent dissolving tank and is used for monitoring the liquid level of the regeneration reagent dissolving tank. The fourth liquid level sensor is installed in the regeneration reagent storage tank and is used for monitoring the liquid level of the regeneration reagent storage tank. The third liquid level sensor is installed in the regeneration reagent dissolving tank for monitoring the liquid level of the regeneration reagent dissolving tank; The fourth liquid level sensor is installed in the regeneration reagent storage pool for monitoring the liquid level of the regeneration reagent storage pool; The second electromagnetic flowmeter is installed in the outlet pipeline corresponding to the flushing pump and the slow washing pump for measuring the flow of water from the flushing pump and the slow washing pump into the fluoride removal adsorption tank; The third electromagnetic flowmeter is installed in the outlet pipeline corresponding to the regeneration reagent lifting pump for measuring the flow of regeneration liquid from the regeneration reagent lifting pump into the fluoride removal adsorption tank.

6. The defluorination system of industrial wastewater adsorbent material according to claim 5, characterized by, The solid-liquid separation module comprises a regeneration waste liquid storage pool, a regeneration waste liquid lifting pump, a second sodium hydroxide electric valve, an integrated reaction pool, an integrated precipitation pool, a pneumatic diaphragm sludge pump, an integrated clear liquid pool, a clear liquid pool lifting pump, a third pH meter, a fifth liquid level sensor and a sixth liquid level sensor; The outlet of the regeneration waste liquid storage pool is connected to the inlet of the regeneration waste liquid lifting pump, and the regeneration waste liquid storage pool is used to store waste liquid generated in the regeneration process of the fluoride removal adsorption tank; The outlet of the regeneration waste liquid lifting pump and the outlet of the second sodium hydroxide electric valve are connected to the inlet of the integrated reaction pool, the regeneration waste liquid lifting pump is used to extract the waste liquid in the regeneration waste liquid storage pool into the integrated reaction pool, and the second sodium hydroxide electric valve is used to control the addition amount of sodium hydroxide added into the integrated reaction pool; The outlet of the integrated reaction pool is connected to the inlet of the integrated precipitation pool, and polyacrylamide is also added into the integrated reaction pool, which is used to react with fluoride ions in the waste liquid through sodium hydroxide and polyacrylamide, and generate fluoride-containing precipitate in the integrated precipitation pool; The outlet of the integrated precipitation pool is connected to the inlet of the pneumatic diaphragm sludge pump and the inlet of the integrated clear liquid pool, the outlet of the pneumatic diaphragm sludge pump is connected to the chemical sludge pipe, and the pneumatic diaphragm sludge pump is used to transport the fluoride-containing precipitate in the integrated precipitation pool to the chemical sludge pipe; The outlet of the integrated clear liquid pool is connected to the clear liquid pool lifting pump, the integrated clear liquid pool is used to store clear liquid after removing the fluoride-containing precipitate, and the clear liquid pool lifting pump is used to transport the clear liquid stored in the integrated clear liquid pool to the front-end industrial pretreatment section; The third pH meter is installed in the integrated reaction pool for monitoring the pH of the water in the integrated reaction pool after being adjusted by sodium hydroxide and polyacrylamide; The fifth liquid level sensor is installed in the regeneration waste liquid storage pool for monitoring the liquid level of the regeneration waste liquid storage pool; The sixth liquid level sensor is installed in the integrated clear liquid pool for monitoring the liquid level of the integrated clear liquid pool.

7. The defluorination system of industrial wastewater adsorbent material according to claim 1, characterized by, The prediction data corresponding to the first target parameter at the t+2th preset time point comprises a first predicted pH value, a second predicted pH value, a third predicted pH value and a predicted fluoride ion concentration, and S7 comprises the following steps: S71, obtaining the first parameter deviation degree corresponding to the t+2th preset time point according to the first preset pH reference range and the first predicted pH value corresponding to the t+2th preset time point; S72, obtaining the second parameter deviation degree corresponding to the t+2th preset time point according to the second preset pH reference range and the second predicted pH value corresponding to the t+2th preset time point; S73, obtaining the third parameter deviation degree corresponding to the t+2th preset time point according to the third preset pH reference range and the third predicted pH value corresponding to the t+2th preset time point; S74, obtaining the first judgment result according to the preset deviation degree threshold and the first parameter deviation degree, the second parameter deviation degree and the third parameter deviation degree corresponding to the t+2th preset time point, wherein the first judgment result includes the first target condition and the first target condition not being met; S76, obtaining the second judgment result corresponding to the t+2th preset time point according to the preset fluoride ion concentration reference range and the predicted fluoride ion concentration corresponding to the t+2th preset time point, wherein the second judgment result includes the second target condition and the second target condition not being met; S77, if the first judgment result is the first target condition and the second judgment result is the second target condition, it is determined that the predicted data of the first target parameter corresponding to the t+2th preset time point meets the target condition.

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