Photovoltaic wastewater full-automatic deep fluorine removal device and method

Abstract

The application discloses a kind of photovoltaic wastewater full automation depth defluorination device, comprising: adsorption system, desorption system and washing system;Adsorption system includes raw water pool, raw water pool precision filter and defluorination resin tower, the water in raw water pool removes impurities by raw water pool precision filter, and effluent is transported to defluorination resin tower and is adsorbed;Desorption system includes desorption agent pool and desorption agent precision filter, and desorption agent in desorption agent pool removes impurities by desorption agent precision filter, and effluent is transported to defluorination resin tower and is regenerated to resin;Washing system includes washing pool and several pipelines, and the effluent in washing pool is transported to defluorination resin tower, and F is separated and analyzed on the resin enrichment, and the regenerated resin is again put into running process, reciprocating cycle.The application is reused after resin regeneration, reduces replacement frequency, solves the problem of high operating cost, process flow is simple, full automation control, clean and environmentally friendly, no secondary pollution, high defluorination efficiency.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to a fully automated deep defluorination device and method for photovoltaic wastewater. Background Technology

[0002] The photovoltaic (PV) industry is a sunrise industry that has emerged based on semiconductor technology and the demand for new energy. PV wastewater mainly comes from wastewater discharged during the production process, containing hydrofluoric acid, hydrochloric acid, potassium hydroxide, hydrogen peroxide, and texturing additives. This wastewater has a high fluoride content, and some regions have strict requirements regarding fluoride concentration, requiring fluoride levels in discharged wastewater to be below 1.0 mg / L. Currently, the main methods for treating fluoride-containing PV wastewater include chemical precipitation, coagulation sedimentation, and resin adsorption.

[0003] Chemical precipitation removes fluoride by reacting calcium ions with fluoride ions to form a precipitate, but its effectiveness is limited, typically treating concentrations up to 20-30 mg / L. It is suitable for treating high-concentration fluoride wastewater. Most companies use lime or other reactive sedimentation methods, which generate large amounts of sludge and can easily cause secondary pollution, requiring improvement. Coagulation and sedimentation utilizes polyacrylamide (PAC) as a defluorinating agent, allowing for full contact, adsorption, and attachment of fluoride in the wastewater. After PAC treatment, fluoride ions in the wastewater are adsorbed and attached to the PAC surface, achieving defluorination. Resin adsorption refers to the physical adsorption between fluoride ions and the resin surface, causing fluoride ions to adhere to the resin. Functional groups in the resin react chemically with fluoride ions in the water, adsorbing the fluoride ions into the resin. When the resin becomes saturated, the adsorbed fluoride ions are removed through regeneration.

[0004] Existing photovoltaic wastewater defluoridation systems have the following problems:

[0005] (1) At present, photovoltaic wastewater defluorination systems are complex and require a lot of manual operation, and cannot achieve automated control.

[0006] (2) The adsorbed water residue in the defluorination resin tower leads to poor regeneration effect and affects the effect; and the desorbent residue in the defluorination resin tower leads to desorbent loss, excessive water volume after regeneration, and waste of water resources.

[0007] (3) The desorption liquid generated after resin regeneration is filtered to remove sludge, resulting in a large amount of sludge that cannot be reused.

[0008] (4) The fluoride resin tower wash water is discharged outside and fresh water is added each time, which cannot achieve resource reuse.

[0009] For example, patent document CN212050891 U discloses a high-concentration fluoride-containing wastewater treatment device, including a lime addition tank, a calcium salt addition tank, a flocculation reaction tank and a sedimentation tank. This method can reduce the fluoride concentration in fluoride-containing wastewater to below 10 mg / L, but it is difficult to reduce it to below 1.0 mg / L. At the same time, for high-concentration fluoride-containing wastewater, this method will also generate a large amount of sludge after treatment.

[0010] Patent document CN 112159033A discloses an invention that discloses a photovoltaic wastewater deep treatment system and application method. The wastewater treatment unit consists of a homogenization equalization tank, a coagulation flotation tank, a sedimentation and silica removal tank, a composite two-stage AO biological tank, a secondary sedimentation tank, a sludge pumping station, a powder carbon adsorption tank, a coagulation sedimentation tank, and a V-type filter. The wastewater treatment process of this method is relatively complex, produces a large amount of sludge, and has a high overall investment and treatment cost.

[0011] Patent document CN 102001766 B discloses a method for defluoridation of photovoltaic wastewater, comprising a four-stage process: chemical precipitation, flocculation sedimentation, air flotation filtration, and ion adsorption. The adsorbent used in this invention is a modified dual-resin ion exchanger, treating the wastewater to meet discharge standards. A drawback of this method is that residual aluminum sulfate remains in the defluoridation resin tower during resin preparation, requiring large amounts of deionized water for rinsing, resulting in water waste.

[0012] Therefore, it is necessary to propose a fully automated deep defluorination device and method for photovoltaic wastewater to at least partially solve the problems existing in the prior art. Summary of the Invention

[0013] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0014] To at least partially solve the above problems, the present invention provides a fully automated deep defluorination device for photovoltaic wastewater, comprising: an adsorption system, a desorption system, and a water washing system.

[0015] The adsorption system includes a raw water tank, a raw water tank precision filter, and a fluoride removal resin tower. The water in the raw water tank is filtered through the raw water tank precision filter to remove impurities, and the effluent is transported to the fluoride removal resin tower for adsorption.

[0016] The desorption system includes a desorbent tank and a desorbent precision filter. The desorbent in the desorbent tank removes impurities through the desorbent precision filter, and the effluent is transported to the defluorination resin tower to regenerate the resin.

[0017] The water washing system includes a water washing tank and several pipes. The adsorbed water in the water washing tank is transported to the defluorination resin tower to desorb and separate the fluoride accumulated on the resin. The regenerated resin is then put back into operation, and the cycle continues.

[0018] Preferably, the raw water tank is equipped with a raw water tank level gauge and a raw water tank sewage lift pump. The raw water tank level gauge is used to detect the water level in the raw water tank, and the raw water tank sewage lift pump is used to transport sewage. The raw water tank level gauge and the raw water tank sewage lift pump are interlocked.

[0019] Preferably, the defluorination resin tower includes a defluorination resin tower one and a defluorination resin tower two with the same structure. The outlet of the precision filter in the raw water tank is connected to the inlet of the defluorination resin tower one. An online fluoride ion monitoring instrument is installed on the outlet pipe of the defluorination resin tower one. A residual water outlet is provided on the defluorination resin tower one, and the residual adsorbed water is sent back to the raw water tank.

[0020] Preferably, the fully automated deep defluorination device for photovoltaic wastewater further includes a compressed air system, which provides power for the water flow.

[0021] Preferably, the desorbent tank is equipped with a desorbent tank agitator, a desorbent tank level gauge, a desorbent tank pH meter, an automatic aluminum salt dosing device, and a desorbent tank flow meter. The desorbent tank agitator is used to agitate the desorbent in the desorbent tank, and the automatic aluminum salt dosing device is used to prepare aluminum salt solution in the desorbent tank. The automatic control system is interlocked with the desorbent tank agitator, the desorbent tank level gauge, the desorbent tank pH meter, the automatic aluminum salt dosing device, and the desorbent tank flow meter.

[0022] Preferably, a desorbent booster pump is installed in the desorbent tank to transport the desorbent to the desorbent precision filter. The desorbent precision filter is connected to the lower inlet and upper inlet of the desorbent in the first defluorination resin tower. The desorbed liquid outlet of the first defluorination resin tower is connected to the neutralization sedimentation tank in the pretreatment stage of the wastewater treatment plant.

[0023] Preferably, the washing tank is provided with three compartments, namely washing tank one, washing tank two, and washing tank three; the outlet of the fluoride removal resin tower one is connected to the desorbent tank, washing tank one, washing tank two, and washing tank three. The first batch of effluent from the fluoride removal resin tower one is sent to the desorbent tank as makeup water, the second batch of effluent is sent to washing tank one, the third batch of effluent is sent to washing tank two, and the adsorption effluent is sent to washing tank three through a valve for use as washing water.

[0024] Preferably, the washing tank is equipped with a level gauge for washing tank 1, a level gauge for washing tank 2, a level gauge for washing tank 3, and a washing pump. The washing pump is used to transport water to the defluorination resin tower 1. The automatic control system is interlocked with the level gauges for washing tank 1, washing tank 2, washing tank 3, and the washing pump.

[0025] Preferably, the water washing pump is connected to the lower inlet and upper inlet of the desorbent in the first defluorination resin tower, and the desorbed liquid outlet of the first defluorination resin tower is connected to the desorbent tank, water washing tank one, water washing tank two and water washing tank three.

[0026] A fully automated deep defluoridation method for photovoltaic wastewater, employing the aforementioned fully automated deep defluoridation device for photovoltaic wastewater, specifically includes:

[0027] The water in the raw water tank is filtered through a precision filter to remove impurities. The effluent is then transported to a fluoride removal resin tower for adsorption. Water that meets the fluoride ion standard is discharged, while wastewater that does not meet the standard is returned to the raw water tank.

[0028] The desorbent in the desorbent tank is filtered to remove impurities, and the effluent is sent to the defluorination resin tower to regenerate the resin.

[0029] The adsorbed water from the washing tank is transported to the defluorination resin tower, where the fluoride concentrated on the resin is separated. The regenerated resin is then put back into operation, and the cycle continues.

[0030] Compared with the prior art, the present invention has at least the following beneficial effects:

[0031] This invention provides a fully automated deep defluoridation device and method for photovoltaic wastewater.

[0032] (1) The defluorination resin uses an amide structure to load aluminum ion functional groups, which exhibits extremely strong selectivity for fluoride ions in the presence of other ions. The defluorination resin has a high adsorption capacity, can treat a large amount of fluoride-containing wastewater, can maintain a high adsorption efficiency after long-term use, has a long service life, and low operating costs.

[0033] (2) The entire resin system of this invention adopts an automated DCS control system with one-button start and stop. The tank is equipped with interlocking protection for pumps, level gauges, flow meters, and pH meters, and is equipped with high and low level alarms, equipment failure information, etc. The signals are collected and viewed in real time at the central control station. The automated control can continuously and efficiently achieve wastewater defluorination.

[0034] (3) The desorption liquid generated by the resin regeneration of this invention is reused as a flocculant in the pretreatment system of wastewater treatment plants and sedimentation tanks. The wash water is adsorbed effluent and recycled, without using fresh water, which is conducive to resource recycling and cost saving.

[0035] (4) The residual adsorbed water and residual desorbent in the resin of the present invention are squeezed out by compressed air to avoid residual desorbent and affect the quality of the effluent.

[0036] The fully automated deep defluorination device and method for photovoltaic wastewater described in this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of the invention. Attached Figure Description

[0037] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0038] Figure 1 This is a schematic diagram of the structure of a fully automated deep defluorination device for photovoltaic wastewater according to the present invention;

[0039] Figure 2 This is a schematic diagram of the defluorination resin tower in a fully automated deep defluorination device for photovoltaic wastewater according to the present invention.

[0040] Figure 3 This is a schematic diagram of the desorption system in a fully automated deep defluorination device for photovoltaic wastewater according to the present invention;

[0041] Figure 4 This is a schematic diagram of the water washing system in a fully automated deep defluorination device for photovoltaic wastewater according to the present invention;

[0042] Figure 5 This is a schematic diagram of the structure of a fully automated deep defluorination method for photovoltaic wastewater according to the present invention.

[0043] In the diagram: 1. Raw water tank; 2. Raw water tank level gauge; 3. Raw water tank wastewater lift pump; 4. Raw water tank precision filter; 5. Defluoridation resin tower one; 6. Defluoridation resin tower two; 7. Desorbent precision filter; 8. Fluoride ion online monitor; 9. Desorbent tank; 10. Desorbent tank mixer; 11. Desorbent tank level gauge; 12. Desorbent tank pH meter; 13. Automatic aluminum salt dosing device; 14. Desorbent lift pump; 15. 16. Desorbent tank flow meter; 17. Neutralization sedimentation tank; 18. Washing tank 1; 19. Washing tank 2; 20. Washing tank 3; 21. Washing tank 1 level gauge; 22. Washing tank 2 level gauge; 23. Washing tank 3 level gauge; 24. Compressed air system; 25. Inlet; 26. Outlet; 27. Desorbent lower inlet; 28. Desorbent upper inlet; 29. ​​Residual water outlet; 30. Desorbent liquid outlet; 21. Washing pump. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0045] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0046] Example:

[0047] like Figure 1-5 As shown, this invention provides a fully automated deep defluorination device for photovoltaic wastewater, comprising: an adsorption system, a desorption system, and a water washing system.

[0048] The adsorption system includes a raw water tank 1, a raw water tank precision filter 4, and a fluoride removal resin tower. The water in the raw water tank 1 is filtered through the raw water tank precision filter 4 to remove impurities, and the effluent is transported to the fluoride removal resin tower for adsorption.

[0049] The desorption system includes a desorbent tank 9 and a desorbent precision filter 7. The desorbent in the desorbent tank 9 is filtered through the desorbent precision filter 7 to remove impurities, and the effluent is transported to the defluorination resin tower to regenerate the resin.

[0050] The water washing system includes a water washing tank and several pipes. The adsorbed water in the water washing tank is transported to the defluorination resin tower to desorb and separate the fluoride accumulated on the resin. The regenerated resin is then put back into operation, and the cycle continues.

[0051] The raw water tank 1 is equipped with a raw water tank level gauge 2 and a raw water tank sewage lift pump 3. The raw water tank level gauge 2 is used to detect the water level in the raw water tank 1, and the raw water tank sewage lift pump 3 is used to transport sewage. The raw water tank level gauge 2 and the raw water tank sewage lift pump 3 are interlocked.

[0052] The defluorination resin tower includes a defluorination resin tower 1 (5) and a defluorination resin tower 2 (6) with the same structure. The outlet of the precision filter 4 in the raw water tank is connected to the inlet 24 of the defluorination resin tower 1. An online fluoride ion monitor 8 is installed on the outlet 25 of the defluorination resin tower 1. A residual water outlet 28 is installed on the defluorination resin tower 1. The residual adsorbed water is sent back to the raw water tank 1.

[0053] The fully automated deep defluorination device for photovoltaic wastewater also includes a compressed air system 23, which provides power for water flow.

[0054] The desorbent tank 9 is equipped with a desorbent tank agitator 10, a desorbent tank level gauge 11, a desorbent tank pH meter 12, an automatic aluminum salt dosing device 13, and a desorbent tank flow meter 15. The desorbent tank agitator 10 is used to agitate the desorbent in the desorbent tank 9, and the automatic aluminum salt dosing device 13 is used to prepare aluminum salt solution in the desorbent tank 9. The automatic control system is interlocked with the desorbent tank agitator 10, the desorbent tank level gauge 11, the desorbent tank pH meter 12, the automatic aluminum salt dosing device 13, and the desorbent tank flow meter 15.

[0055] A desorbent booster pump 14 is installed in the desorbent tank 9. The desorbent booster pump 14 is used to transport the desorbent to the desorbent precision filter 7. The desorbent precision filter 7 is connected to the desorbent lower inlet 26 and desorbent upper inlet 27 of the defluorination resin tower 5. The desorbed liquid outlet 29 of the defluorination resin tower 5 is connected to the neutralization sedimentation tank 16 in the pretreatment stage of the sewage treatment plant.

[0056] The washing tank is equipped with three compartments, namely washing tank 17, washing tank 28, and washing tank 319. The outlet 25 of the fluoride removal resin tower 5 is connected to the desorbent tank 9, washing tank 17, washing tank 28, and washing tank 319. The first batch of effluent from the fluoride removal resin tower 5 is sent to the desorbent tank 9 as makeup water, the second batch is sent to washing tank 17, and the third batch is sent to washing tank 28. The adsorbed water is sent to washing tank 319 through a valve for use as washing water.

[0057] The washing tank is equipped with a level gauge 20 for washing tank 1, a level gauge 21 for washing tank 2, a level gauge 22 for washing tank 3, and a washing pump 30. The washing pump 30 is used to transport water to the defluorination resin tower 5. The automatic control system is interlocked with the level gauges 20 for washing tank 1, 21 for washing tank 2, 22 for washing tank 3, and the washing pump 30.

[0058] The water washing pump 30 is connected to the lower inlet 26 and upper inlet 27 of the desorbent in the defluorination resin tower 5. The desorbed liquid outlet 29 of the defluorination resin tower 5 is connected to the desorbent tank 9, the water washing tank 17, the water washing tank 28 and the water washing tank 3 19.

[0059] A fully automated deep defluoridation method for photovoltaic wastewater, employing the aforementioned fully automated deep defluoridation device for photovoltaic wastewater, specifically includes:

[0060] The water in raw water tank 1 passes through the raw water tank precision filter 4 to remove impurities. The effluent is then transported to the defluoridation resin tower for adsorption. Water that meets the fluoride ion standard is discharged, while wastewater that does not meet the standard is returned to raw water tank 1.

[0061] The desorbent in the desorbent tank 9 is filtered through the desorbent precision filter 7 to remove impurities, and the effluent is sent to the defluorination resin tower to regenerate the resin.

[0062] The adsorbed water from the washing tank is transported to the defluorination resin tower, where the fluoride concentrated on the resin is separated. The regenerated resin is then put back into operation, and the cycle continues.

[0063] The working principle of the above technical solution is as follows:

[0064] This invention discloses a fully automated deep defluorination device for photovoltaic wastewater, including an adsorption system, a desorption system, and a washing system. The adsorption system includes a raw water tank 1, a raw water tank precision filter 4, a first defluorination resin tower 5 and a second defluorination resin tower 6, as well as several pipes and pneumatic valves.

[0065] The desorption system includes a desorbent tank 9, a desorbent precision filter 7, a desorbent dosing system, and several pipelines and pneumatic valves;

[0066] The washing system includes washing pool 17, washing pool 2 18 and washing pool 3 19, several pipes and pneumatic valves.

[0067] The workflow within each system is as follows:

[0068] Adsorption System: Water from raw water tank 1 is pumped to precision filter 4 via raw water tank sewage lift pump 3 to filter impurities. Raw water tank 1 is equipped with raw water tank level gauge 2, which is interlocked with raw water tank sewage lift pump 3 and equipped with high and low level alarms. Water from the precision filter 4 is pumped to the inlet 24 of the defluorination resin tower 5. An online fluoride ion monitor 8 is installed on the outlet 25 of the defluorination resin tower 5. Wastewater is discharged when the detected fluoride ion content meets the standard; wastewater that does not meet the standard is returned to raw water tank 1. Residual adsorbed water in the defluorination resin tower 5 is pumped back to raw water tank 1 via residual water outlet 28 and compressed air system 23.

[0069] Desorption system: The process is air compression—desorption liquid countercurrent—desorption liquid cocurrent—air compression. The desorption system is equipped with an automatic control system, which is interlocked with the desorbent tank agitator 10, desorbent tank level gauge 11, desorbent tank pH meter 12, automatic aluminum salt dosing device 13, and desorbent tank flow meter 15. The automatic aluminum salt dosing device 13 prepares aluminum salt solution in the desorbent tank 9. The desorbent is delivered to the desorbent precision filter through the desorbent lift pump 14. The filter 7 filters impurities, and the desorbed liquid from the precision filter 7 is transported to the lower inlet 26 of the desorbent in the defluorination resin tower 5 for soaking and degassing. The desorbent is then transported to the upper inlet 27 of the desorbent in the defluorination resin tower 5. The desorbed liquid flows out through the desorbed liquid outlet 29 of the defluorination resin tower 5 and is transported to the neutralization sedimentation tank 16 in the pretreatment stage of the sewage treatment plant for use as a flocculant. The remaining desorbed liquid in the defluorination resin tower 5 is pressurized to the desorbent tank 9 by the compressed air system 23.

[0070] The water washing system has the following process: counter-current water washing - co-current water washing once - air-compressed water washing - co-current water washing twice - air-compressed water washing - co-current water washing three times - air-compressed air washing. The water washing system is equipped with an automatic control system, which is interlocked with the level gauge 20 of water washing tank 1, the level gauge 21 of water washing tank 2, the level gauge 22 of water washing tank 3, and the water washing pump 30.

[0071] Water from washing tank 17 is pumped by washing pump 30 to the desorbent lower inlet 26 of defluorination resin tower 5 for soaking and degassing. The washing water is then pumped to the desorbent upper inlet 27 of resin 5. The first washing water flows by gravity from the desorbent outlet 29 of defluorination resin tower 5 to desorbent tank 9. The residual water flows out from the outlet 25 of defluorination resin tower 5 and is pressurized to desorbent tank 9 by compressed air system 23. At the same time, the adsorption water from the standby defluorination resin tower 26 is also used as supplementary water for desorbent tank 9.

[0072] The water from the second washing tank 18 is pumped by the washing pump 30 to the desorbent inlet 27 of the resin 5. The second washing water flows by gravity from the desorbent outlet 29 of the defluorination resin tower 15 to the washing tank 17. The residual water is pressurized to the washing tank 17 by the compressed air system 23.

[0073] The water from the third washing tank 19 is pumped by the washing pump 30 to the desorbent inlet 27 of the resin 5. The third washing water flows by gravity from the desorbent outlet 29 of the resin 5 to the second washing tank 18. The residual water is pressurized to the second washing tank 18 by the compressed air system 23.

[0074] During the regeneration of fluoride removal resin tower 5, fluoride removal resin tower 6 starts its adsorption process. Part of the adsorbed water is discharged, and the other part is sent to the washing tank for replenishment. Fluoride removal resin tower 5 and fluoride removal resin tower 6 alternately adsorb and desorb, ensuring continuous operation of fluoride removal.

[0075] The technical effects of the above technical solution are as follows:

[0076] This invention provides a fully automated deep defluoridation device and method for photovoltaic wastewater.

[0077] The entire resin system adopts an automated DCS control system. The entire system is set to start and stop with one button. The tank is equipped with interlocking protection for pumps, level gauges, flow meters, and pH meters. It is equipped with high and low level alarms, equipment failure information, etc. The signals are collected and viewed in real time at the central control. The automated control can continuously and efficiently achieve wastewater defluoridation.

[0078] The defluorination resin utilizes an amide structure loaded with aluminum ion functional groups, exhibiting extremely strong selectivity for fluoride ions even in the presence of other ions. It possesses high adsorption capacity, capable of treating large quantities of fluoride-containing wastewater, maintains high adsorption efficiency even after prolonged use, and boasts a long service life and low operating costs.

[0079] The desorption liquid generated during resin regeneration is reused as a flocculant in the wastewater pretreatment system and sedimentation tank. The wash water is adsorbed effluent and recycled, eliminating the use of fresh water, which promotes resource recovery and cost savings.

[0080] After adsorption saturation, the residual adsorbed water and residual desorbent in the defluorination resin tower are squeezed out with compressed air to prevent residual desorbed liquid from affecting the quality of the effluent.

[0081] The resin tower is equipped with a backup tower, and adsorption and desorption operate alternately to ensure continuous operation. The resin is regenerated and reused, reducing the frequency of replacement and solving the problem of high operating costs.

[0082] This invention is applicable to the further deep defluorination treatment of photovoltaic wastewater after biochemical treatment. The fluoride ion concentration of the fluoride-containing wastewater can be stably kept below 1.0 mg / L. It has the characteristics of simple process flow, fully automated control, clean and environmentally friendly, no secondary pollution, and high defluorination efficiency.

[0083] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0084] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0085] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A fully automated deep defluoridation device for photovoltaic wastewater, characterized in that, include: Adsorption system, desorption system, water washing system and compressed air system (23). The adsorption system includes a raw water tank (1), a raw water tank precision filter (4), and a fluoride removal resin tower. The water in the raw water tank (1) is filtered through the raw water tank precision filter (4) to remove impurities, and the effluent is transported to the fluoride removal resin tower for adsorption. The fluoride removal resin tower includes a first fluoride removal resin tower (5) and a second fluoride removal resin tower (6) with the same structure. The outlet of the raw water tank precision filter (4) is connected to the inlet (24) of the first fluoride removal resin tower (5). The first fluoride removal resin tower (5) is provided with a residual water outlet (28), and the residual adsorbed water is sent back to the raw water tank (1). The desorption system includes a desorbent tank (9) and a desorbent precision filter (7). The desorbent tank (9) is equipped with a desorbent tank agitator (10), a desorbent tank level gauge (11), a desorbent tank pH meter (12), an automatic aluminum salt dosing device (13), a desorbent tank flow meter (15), and a desorbent booster pump (14). The automatic control system is connected to the desorbent tank agitator (10), the desorbent tank level gauge (11), the desorbent tank pH meter (12), and the automatic aluminum salt dosing device (13). The desorbent tank flow meter (15) is interlocked with the desorbent tank flow meter (15); the automatic aluminum salt dosing device (13) is used to prepare aluminum salt solution in the desorbent tank (9); the desorbent booster pump (14) is used to transport the desorbent to the desorbent precision filter (7), the desorbent precision filter (7) is connected to the desorbent lower inlet (26) and desorbent upper inlet (27) of the defluorination resin tower (5), and the desorbent liquid outlet (29) of the defluorination resin tower (5) is connected to the neutralization sedimentation tank (16) of the sewage treatment pretreatment stage; The water washing system includes a water washing tank and several pipes. The adsorbed water from the water washing tank is transported to the defluorination resin tower to separate the F accumulated on the resin. The regenerated resin is then put back into operation for repeated cycles. The water washing tank is divided into three sections: water washing tank one (17), water washing tank two (18), and water washing tank three (19). The outlet (25) of the defluorination resin tower one (5) is connected to the desorbent tank (9), water washing tank one (17), water washing tank two (18), and water washing tank three (19). The first effluent from the defluorination resin tower one (5) is sent to the desorbent tank (9) as makeup water, and the second effluent is sent to the desorbent tank (9). The water is sent to the first washing tank (17), and the third effluent is sent to the second washing tank (18). The adsorbed water is sent to the third washing tank (19) through a valve for use as washing water. The washing tank is equipped with a level gauge (20) for the first washing tank, a level gauge (21) for the second washing tank, a level gauge (22) for the third washing tank, and a washing pump (30). The automatic control system is interlocked with the level gauge (20) for the first washing tank, the level gauge (21) for the second washing tank, the level gauge (22) for the third washing tank, and the washing pump (30). The washing pump (30) is connected to the lower inlet (26) and the upper inlet (27) of the desorbent in the first fluoride resin tower (5). The compressed air system (23) is used to power the water flow and to deeply squeeze the residual water and desorbent in the resin with compressed air.

2. The fully automated deep defluoridation device for photovoltaic wastewater according to claim 1, characterized in that, The raw water tank (1) is equipped with a raw water tank level gauge (2) and a raw water tank sewage lift pump (3). The raw water tank level gauge (2) is used to detect the water level in the raw water tank (1), and the raw water tank sewage lift pump (3) is used to transport sewage. The raw water tank level gauge (2) and the raw water tank sewage lift pump (3) are interlocked.

3. The fully automated deep defluorination device for photovoltaic wastewater according to claim 1, characterized in that, An online fluoride ion monitor (8) is installed on the outlet (25) pipeline of the fluoride removal resin tower (5).

4. A fully automated deep defluoridation method for photovoltaic wastewater, employing the fully automated deep defluoridation device for photovoltaic wastewater as described in any one of claims 1-3, characterized in that, Specifically: The water in the raw water tank (1) is filtered through the raw water tank precision filter (4) to remove impurities. The effluent is then transported to the defluorination resin tower for adsorption. Water that meets the fluoride ion standard is discharged, while wastewater that does not meet the standard is returned to the raw water tank (1). The desorbent in the desorbent tank (9) is filtered through the desorbent precision filter (7) to remove impurities, and the effluent is transported to the defluorination resin tower to regenerate the resin. The adsorbed water from the washing tank is transported to the defluorination resin tower, where the fluoride concentrated on the resin is separated. The regenerated resin is then put back into operation, and the cycle continues.

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