Photovoltaic wastewater treatment system

Abstract

The photovoltaic wastewater treatment system comprises a raw water tank, a defluorination reactor, a denitrification reactor and a water outlet tank, a water outlet of the raw water tank is connected with a water inlet of the defluorination reactor, a water outlet of the defluorination reactor is connected with a water inlet of the denitrification reactor, and a water outlet of the denitrification reactor is connected with the water outlet tank; the raw water tank is used for storing photovoltaic wastewater; the defluorination reactor reacts with fluorine ions in the photovoltaic wastewater, defluorinated precipitates and defluorinated wastewater are obtained through a solid-liquid separation device arranged in the defluorination reactor, and the defluorinated wastewater enters a denitrification reactor; a denitrification filler is arranged in the denitrification reactor, the defluorinated wastewater passes through the denitrification filler to obtain denitrified wastewater, and the denitrified wastewater enters the water outlet tank. According to the invention, deep removal of fluorine and nitrogen in wastewater can be realized.

Description

Technical Field

[0001] This application relates to the field of photovoltaic equipment technology, and in particular to a photovoltaic wastewater treatment system. Background Technology

[0002] Currently, solar energy, as a clean energy source, is used in all aspects of our daily lives. Solar energy appears to be "efficient, energy-saving, and space-saving," but in reality, the texturing, phosphorus diffusion, etching, and pickling processes in the production of monocrystalline or polycrystalline silicon wafers involve the extensive use of chemicals such as hydrofluoric acid, nitric acid, phosphorus oxychloride, and isopropanol. Consequently, the wastewater generated is large in volume and complex in composition, containing high concentrations of polyethylene glycol, high nitrates, small amounts of surfactants, high fluoride ion content, and large pH fluctuations, posing a significant challenge to wastewater treatment in the photovoltaic industry.

[0003] In addition, photovoltaic wastewater also contains nitrates, nitrogen, and COD. Nitrate nitrogen levels can reach as high as 2000 mg / L, which is difficult to handle with existing general biological treatment methods (A / O, membrane filtration, etc.). This can even lead to adverse effects such as complex processes, high carbon source consumption, high carbon emissions, and complex commissioning. Therefore, there is an urgent need to find a wastewater treatment system to address the need for deep removal of fluoride and nitrogen from photovoltaic production wastewater. Utility Model Content

[0004] This application provides a photovoltaic wastewater treatment system to solve the above-mentioned technical problems.

[0005] In a first aspect, according to some embodiments, this application provides a photovoltaic wastewater treatment system, comprising:

[0006] The system includes a raw water tank, a defluoridation reactor, a denitrification reactor, and an outlet water tank; the outlet of the raw water tank is connected to the inlet of the defluoridation reactor, the outlet of the defluoridation reactor is connected to the inlet of the denitrification reactor, and the outlet of the denitrification reactor is connected to the outlet water tank.

[0007] The raw water tank is used to store photovoltaic wastewater;

[0008] The defluorination reactor reacts with fluoride ions in the photovoltaic wastewater, and the precipitate and wastewater are obtained after defluorination by the solid-liquid separation device installed in the defluorination reactor. The wastewater after defluorination enters the denitrification reactor.

[0009] The denitrification reactor is equipped with denitrification packing material. The defluorinated wastewater passes through the denitrification packing material to obtain denitrified wastewater, which then enters the effluent tank.

[0010] Preferably, the system further includes: a first reagent storage box and a second reagent storage box, wherein the first reagent storage box and the second reagent storage box are respectively used to store the first reagent and the second reagent that react with fluoride ions;

[0011] The first reagent storage tank and the second reagent storage tank are respectively connected to the defluorination reactor via a first inlet pump and a second inlet pump.

[0012] Preferably, the defluorination reactor is provided with an inlet pool, and the raw water tank is connected to the inlet pool via a third inlet pump; the inlet pool is located below the solid-liquid separation device;

[0013] The bottom of the defluorination reactor is provided with a conical sedimentation tank, which is used to store the defluorinated precipitate separated by the solid-liquid separation device. The conical sedimentation tank is located below the inlet tank.

[0014] Preferably, the system further includes a plate and frame filter press, which is used to separate the precipitate after defluorination.

[0015] The inlet end of the plate and frame filter press is connected to the screw conveyor pump, and the screw conveyor pump is connected to the conical sedimentation tank;

[0016] The outlet end of the plate and frame filter press is connected to the filtrate return pump, and the filtrate return pump is connected to the inlet tank of the defluorination reactor.

[0017] Preferably, the defluorination reactor further includes a first detector located near the outlet of the defluorination reactor for detecting the fluoride ion content in the defluorinated wastewater.

[0018] Preferably, the inlet of the denitrification reactor is located at the bottom of the denitrification reactor, the denitrification reactor contains denitrification packing, a microporous baffle is provided at the bottom of the denitrification packing, and the microporous baffle is located above the inlet of the denitrification reactor.

[0019] The top of the denitrification reactor is connected to the inlet end of the denitrification circulation pump, and the bottom of the denitrification reactor is connected to the outlet end of the denitrification circulation pump. The denitrification circulation pump is used to draw water from the top of the denitrification reactor and pump it in from the bottom of the denitrification reactor.

[0020] Preferably, the outlet of the denitrification reactor is located at the top of the denitrification reactor, and the outlet of the denitrification reactor is connected to the top of the outlet tank through a first outlet pump; the bottom of the denitrification reactor is connected to the bottom of the outlet tank through a second outlet pump.

[0021] Preferably, an aeration blower is connected to the bottom of the denitrification reactor; or / and, the system further includes: an intermediate water tank; one side of the intermediate water tank is connected to the outlet of the defluorination reactor via an intermediate water tank inlet pump; the other side of the intermediate water tank is connected to the inlet of the denitrification reactor via an intermediate water tank outlet pump.

[0022] Preferably, a heating sensor is also connected to the bottom of the denitrification reactor, and the heating sensor is used to heat the denitrification reactor.

[0023] Preferably, the system further includes an acid inlet tank and an alkali inlet tank, wherein the acid inlet tank and the alkali inlet tank are respectively connected to the denitrification reactor via an acid inlet pump and an alkali inlet pump;

[0024] Or / and, the denitrification reactor further includes a second detector for detecting the nitrogen content and pH value within the denitrification reactor.

[0025] According to some embodiments, this application provides a photovoltaic wastewater treatment system that couples efficient defluorination and denitrification processes. The front-end defluorination equipment achieves solid-liquid separation while removing defluorination, effectively separating fluoride precipitates. The back-end denitrification equipment treats the wastewater after defluorination to remove nitrogen. Through the synergistic action of the raw water tank, defluorination reactor, denitrification reactor, and effluent tank, comprehensive treatment of photovoltaic wastewater is achieved. This system can meet the requirements for deep removal of fluoride and nitrate nitrogen from photovoltaic wastewater. The process is simple, easy to maintain, has low operating costs, and produces stable and compliant effluent. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or in the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a photovoltaic wastewater treatment system provided in an embodiment of this application;

[0028] Figure 2 A schematic diagram illustrating the defluorination effect of a defluorination reactor in a photovoltaic wastewater treatment system provided in this application embodiment;

[0029] Figure 3 This is a schematic diagram illustrating the defluorination effect of a photovoltaic wastewater treatment system provided in an embodiment of this application.

[0030] Figure 4 This is a schematic diagram illustrating the denitrification effect of a photovoltaic wastewater treatment system provided in an embodiment of this application.

[0031] Figure reference numerals: Raw water tank 1; Defluoridation reactor 2; Denitrification reactor 3; Outlet water tank 4; Solid-liquid separation device 21; Inlet pool 22; Conical sedimentation tank 23; First detector 24; Denitrification packing 31; Microporous baffle 32; Second detector 33; First reagent storage tank 5; Second reagent storage tank 6; First inlet pump 7; Second inlet pump 8; Third inlet pump 9; Plate and frame filter press 10; Screw conveying pump 11; Filtrate reflux pump 12; Intermediate water tank 13; Intermediate water tank inlet pump 14; Intermediate water tank outlet pump 15; Denitrification circulation pump 16; First outlet pump 17; Second outlet pump 18; Aeration blower 19; Acid inlet water tank 40; Alkali inlet water tank 41; Acid inlet pump 42; Alkali inlet pump 43; Heating sensor 44. Detailed Implementation

[0032] The technical solution of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication of two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0033] The following describes in further detail a photovoltaic wastewater treatment system provided in this embodiment with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0034] Please refer to Figure 1A photovoltaic wastewater treatment system includes: a raw water tank 1, a defluorination reactor 2, a denitrification reactor 3, and an effluent tank 4; the outlet of the raw water tank 1 is connected to the inlet of the defluorination reactor 2, the outlet of the defluorination reactor 2 is connected to the inlet of the denitrification reactor 3, and the outlet of the denitrification reactor 3 is connected to the effluent tank 4; the raw water tank 1 is used to store photovoltaic wastewater; the defluorination reactor 2 reacts with fluoride ions in the photovoltaic wastewater, and after passing through a solid-liquid separation device 21 installed in the defluorination reactor, a precipitate and wastewater after defluorination are obtained, and the wastewater after defluorination enters the denitrification reactor 3; the denitrification reactor 3 is equipped with denitrification packing 31, and the wastewater after defluorination passes through the denitrification packing 31 to obtain denitrified wastewater, and the denitrified wastewater enters the effluent tank 4.

[0035] Specifically, such as Figure 1 As shown, raw water tank 1 is used to store photovoltaic wastewater to be treated. The outlet of raw water tank 1 is connected to the inlet of defluorination reactor 2. The wastewater is pumped from raw water tank 1 into defluorination reactor 2. Chemical reagents that react with fluoride ions are injected into defluorination reactor 2 to remove fluoride ions from the wastewater. Defluorination reactor 2 has a solid-liquid separation device 21, which separates the defluorinated precipitate and the defluorinated wastewater obtained after the chemical reaction. The outlet of defluorination reactor 2 is connected to the inlet of denitrification reactor 3. The defluorinated wastewater enters denitrification reactor 3, which contains denitrification packing 31. The denitrification packing 31 uses high-efficiency denitrification special packing material, which consists of round particles with a diameter of 10mm-20mm and a bulk density of 1.3t / m³. 3 The denitrification packing 31 can employ sulfur autotrophic denitrification, which features low cost, high denitrification load, strong shock resistance, and easy reactor maintenance, making it particularly suitable for treating high-nitrate nitrogen wastewater. The defluorinated wastewater enters the denitrification reactor 3, passes through the denitrification packing 31, and is then denitrified. The outlet of the denitrification reactor 3 is connected to the effluent tank 4, which is used to store the denitrified wastewater.

[0036] As can be seen, the photovoltaic wastewater treatment system provided in this application couples efficient defluorination and denitrification processes. The front-end defluorination equipment achieves solid-liquid separation while removing defluorination, effectively separating fluoride precipitates. The back-end denitrification equipment can denitrify the wastewater after defluorination. Through the synergistic effect of the raw water tank 1, defluorination reactor 2, denitrification reactor 3, and effluent tank 4, comprehensive treatment of photovoltaic wastewater is achieved. It can meet the requirements for deep removal of fluoride and nitrate nitrogen from photovoltaic wastewater. The process is simple, easy to maintain, has low operating costs, and the effluent consistently meets standards.

[0037] In one embodiment, the system further includes: a first reagent storage tank 5 and a second reagent storage tank 6, the first reagent storage tank 5 and the second reagent storage tank 6 being used to store a first reagent and a second reagent that react with fluoride ions, respectively; the first reagent storage tank 5 and the second reagent storage tank 6 are connected to the defluorination reactor 2 via a first inlet pump 7 and a second inlet pump 8, respectively.

[0038] Specifically, such as Figure 1 As shown, the system also includes a first reagent storage tank 5 and a second reagent storage tank 6, which are used to store the first reagent and the second reagent that react with fluoride ions, respectively. For example, the first reagent is a CaCl2 solution, and the first reagent storage tank 5 is a CaCl2 solution storage tank; the second reagent is a Ca(OH)2 solution, and the second reagent storage tank 6 is a Ca(OH)2 solution storage tank. The first reagent storage tank 5 and the second reagent storage tank 6 are connected to the defluorination reactor 2 via a first inlet pump 7 and a second inlet pump 8, respectively. The CaCl2 solution storage tank and the Ca(OH)2 solution storage tank pump the CaCl2 solution and the Ca(OH)2 solution into the defluorination reactor 2 via the first inlet pump 7 and the second inlet pump 8, respectively, with a mass ratio of CaCl2 to Ca(OH)2 of 1:1 to 2:1. The waste fluoride ions in the waste liquid combine with the Ca ions pumped into the defluorination device to form calcium fluoride precipitate, which, under the action of the upflow, contacts the solid-liquid separation device 21 of the defluorination reactor 2 to complete the sedimentation process.

[0039] In one embodiment, the defluorination reactor 2 is provided with an inlet pool 22, and the raw water tank 1 is connected to the inlet pool 22 through a third inlet pump 9; the inlet pool 22 is located below the solid-liquid separation device 21; the bottom of the defluorination reactor 2 is provided with a conical sedimentation tank 23, which is used to store the defluorinated precipitate separated by the solid-liquid separation device 21, and the conical sedimentation tank 23 is located below the inlet pool 22.

[0040] Specifically, such as Figure 1 As shown, the defluorination reactor 2 is equipped with an inlet tank 22. Photovoltaic wastewater stored in the raw water tank 1 enters the inlet tank 22 of the defluorination reactor 2 via a third inlet pump 9. The inlet tank 22 is located below the solid-liquid separation device 21. The wastewater entering the inlet tank 22 undergoes a chemical reaction within the defluorination reactor 2, generating defluorinated precipitate and defluorinated wastewater. A conical sedimentation tank 23 is located at the bottom of the defluorination reactor 2, below the inlet tank 22, and is used to store the defluorinated precipitate.

[0041] In one embodiment, the system further includes: a plate and frame filter press 10, which is used to separate the precipitate after defluorination; the inlet end of the plate and frame filter press 10 is connected to a screw conveyor pump 11, which is connected to a conical sedimentation tank 23; and the outlet end of the plate and frame filter press 10 is connected to a filtrate return pump 12, which is connected to the inlet tank 22 of the defluorination reactor.

[0042] Specifically, such as Figure 1 As shown, the conical sedimentation tank 23 stores the precipitate after defluorination and discharges the precipitate to the plate and frame filter press 10 through the screw conveyor pump 11. The plate and frame filter press 10 is used to filter the precipitate, press the precipitate dry and discharge it, and then inject the pressed water into the inlet tank 22 of the defluorination reactor 2 through the filtrate return pump 12 to further remove residual fluoride ions.

[0043] The embodiments of this application achieve efficient separation and reuse of precipitates after defluorination by adding a plate and frame filter press 10. The plate and frame filter press 10 receives precipitates from the conical sedimentation tank 23, filters and presses them dry before discharging. At the same time, the filtered water is reinjected into the defluorination reactor 2 via the filtrate return pump 12 to further remove residual fluoride ions and enhance the system's treatment effect.

[0044] In one embodiment, the defluorination reactor 2 further includes a first detector 24, which is located near the outlet of the defluorination reactor 2 and is used to detect the fluoride ion content of the wastewater after defluorination.

[0045] Specifically, such as Figure 1 As shown, the defluorination reactor 2 includes a first detector 24, which is located near the outlet of the defluorination reactor 2 and is used to monitor the fluoride ion content of the defluorinated wastewater in real time. If the fluoride ion content meets the requirements, the defluorinated wastewater is further injected into the denitrification reactor 3.

[0046] In one embodiment, the bottom of the denitrification reactor 3 is connected to an aeration blower 19; and / or the system further includes an intermediate water tank 13, one side of which is connected to the outlet of the defluorination reactor 2 via an intermediate water tank inlet pump 14; the other side of which is connected to the inlet of the denitrification reactor 3 via an intermediate water tank outlet pump 15.

[0047] Specifically, such as Figure 1 As shown, an aeration fan 19 is connected to the bottom of the denitrification reactor 3. The aeration fan 19 serves as a backwash fan and is turned on during backwashing. An aeration head is also connected to the bottom of the denitrification reactor 3 to increase liquid agitation. The aeration head is connected to the aeration fan 19, which is turned on during backwashing. The fan flow rate is 8 m³ / s. 3 / min-20m 3 / min. For example Figure 1As shown, the system also includes an intermediate water tank 13. The defluorinated wastewater is pumped into the intermediate water tank 13 via the intermediate water tank inlet pump 14 for temporary water storage. The top of the defluorination reactor 2 is provided with an outlet connected to the intermediate water tank inlet pump 14. The defluorinated wastewater first enters the intermediate water tank 13, which is used for temporary water storage during the backwashing of the denitrification reactor 3. The intermediate water tank outlet pump 15 is connected to the denitrification reactor 3. In one embodiment, the inlet of the denitrification reactor 3 is located at the bottom of the denitrification reactor 3. The denitrification reactor 3 contains denitrification packing 31, and a microporous baffle 32 is provided at the bottom of the denitrification packing 31. The microporous baffle 32 is located above the inlet of the denitrification reactor 3. The top of the denitrification reactor 3 is connected to the inlet of the denitrification circulation pump 16, and the bottom of the denitrification reactor 3 is connected to the outlet of the denitrification circulation pump 16. The denitrification circulation pump 16 is used to draw water from the top of the denitrification reactor 3 and pump it in from the bottom of the denitrification reactor 3.

[0048] Specifically, such as Figure 1 As shown, the denitrification reactor 3 contains denitrification packing material 31, which consists of round particles with a diameter of 10mm-20mm and a bulk density of 1.3t / m³. 3 The packing has a microporous baffle 32 at the bottom and the microporous baffle 32 is located above the inlet of the denitrification reactor 3. The microporous baffle 32 has several small holes with a diameter of 3-4 mm. On the one hand, wastewater can pass through the micropores and the packing cannot enter the bottom of the denitrification reactor 3. On the other hand, it is separated from the bottom aeration head and the inlet to prevent blockage. After backwashing, fine particles can also be discharged from the denitrification reactor 3 through the micropores.

[0049] like Figure 1 As shown, the denitrification reactor 3 is also equipped with a denitrification circulation pump 16. The denitrification circulation pump 16 draws water from the top of the denitrification reactor 3 and pumps it into the bottom of the denitrification reactor 3, providing the denitrification reactor 3 with an additional upward flow velocity. The upward flow velocity is controlled at 1m / s-2m / s, thereby promoting the upward flow of wastewater and the full reaction of the denitrification packing 31.

[0050] In one embodiment, the outlet of the denitrification reactor 3 is located at the top of the denitrification reactor 3, and the outlet of the denitrification reactor 3 is connected to the top of the outlet tank 4 through the first outlet pump 17; the bottom of the denitrification reactor 3 is connected to the bottom of the outlet tank 4 through the second outlet pump 18.

[0051] Specifically, such as Figure 1 As shown, the outlet of the denitrification reactor 3 is located at the top of the reactor. The outlet of the denitrification reactor 3 is connected to the top of the effluent tank 4 via a first effluent pump 17, injecting the denitrified wastewater into the effluent tank 4. Simultaneously, an outlet is located at the bottom of the effluent tank 4, connected to the bottom of the denitrification reactor 3 via a second effluent pump 18, for backwashing the reactor 3. The effluent tank 4 can serve as both a container for storing the denitrified wastewater and a backwash effluent tank.

[0052] As can be seen, the effluent system of the denitrification reactor 3 designed in the embodiments of this application achieves the dual functions of efficient wastewater treatment and equipment maintenance. The top outlet, in conjunction with the first effluent pump 17, smoothly injects the denitrified wastewater into the effluent tank 4, ensuring treatment efficiency. At the same time, the bottom outlet is connected to the second effluent pump 18, forming a backwashing loop, using the water in the effluent tank 4 to periodically clean the denitrification reactor 3, effectively preventing blockage and sedimentation, and extending equipment life.

[0053] In one embodiment, a heating sensor 44 is also connected to the bottom of the denitrification reactor 3, and the heating sensor 44 is used to heat the denitrification reactor 3.

[0054] Specifically, a heating sensor 44 is also connected to the bottom of the denitrification reactor 3. The heating sensor 44 is used to heat the denitrification reactor 3. By heating with the heating sensor 44, the temperature inside the denitrification reactor 3 is controlled at 28-32℃, ensuring that the denitrifying thiobacilli in the denitrification reactor 3 are in a suitable environment.

[0055] In one embodiment, the system further includes: an acid inlet tank 40 and an alkali inlet tank 41, which are connected to the denitrification reactor 3 via an acid inlet pump 42 and an alkali inlet pump 43, respectively; or / and, the denitrification reactor 3 further includes a second detector 33, which is used to detect the nitrogen content and pH value in the denitrification reactor 3.

[0056] Specifically, such as Figure 1 As shown, acid inlet tank 40 and alkali inlet tank 41 are connected to denitrification reactor 3 via acid inlet pump 42 and alkali inlet pump 43, respectively. The pH inside denitrification reactor 3 is maintained at 7-9 by adjusting the acid inlet tank 40 and alkali inlet tank 41. Specifically, denitrification reactor 3 also includes a second detector 33, which is used to detect the nitrogen content (TN) and pH value inside denitrification reactor 3. The acid and alkali inlet water are adjusted based on the pH value fed back by the second detector 33.

[0057] As can be seen, the above embodiment, by adding an acid inlet tank 40 and an alkali inlet tank 41, and equipping them with corresponding inlet pumps and a second detector 33, achieves precise control of the pH value and nitrogen content within the denitrification reactor 3. This system can automatically adjust the acid and alkali inlet water based on data feedback from the second detector 33, ensuring that the pH value within the denitrification reactor 3 is consistently maintained within a suitable range of 7-9, thereby optimizing the denitrification effect. Simultaneously, real-time monitoring of nitrogen content helps to precisely control the treatment process and improve the quality of the effluent.

[0058] The photovoltaic wastewater treatment system provided in this application combines efficient defluorination and denitrification processes. The front-end defluorination equipment achieves solid-liquid separation while removing defluorination, effectively separating fluoride precipitates. The back-end denitrification equipment treats the wastewater after defluorination to remove nitrogen. Through the synergistic action of the raw water tank 1, defluorination reactor 2, denitrification reactor 3, and effluent tank 4, comprehensive treatment of photovoltaic wastewater is achieved. This system can meet the requirements for deep removal of fluoride and nitrate nitrogen from photovoltaic wastewater. The process is simple, easy to maintain, has low operating costs, and produces stable and compliant effluent.

[0059] Based on the above embodiments, in one specific embodiment of this application, when the wastewater volume is 5000m³ 3 / d, the influent water quality is TN≤450mg / L, F≤900mg / L. Using the photovoltaic wastewater treatment system provided in this application, the first reagent is CaCl2, the second reagent is Ca(OH)2, CaCl2:Ca(OH)2=1:1-2:1, the calcium-fluoride ratio is 1.1-1.8, the hydraulic retention time of the defluorination reactor 2 is 2h, and the effluent fluoride concentration is reduced to below 8mg / L. The treatment effect is as follows: Figure 2 As shown in the figure. The hydraulic retention time of denitrification reactor 3 is 6 hours. The final effluent fluoride concentration is below 8 mg / L, and TN is below 15 mg / L. No carbon source needs to be added during denitrification. The treatment effect is as follows: Figure 3 , Figure 4 .

[0060] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this application and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this application should be included within the protection scope of this application. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A photovoltaic wastewater treatment system, characterized in that, include: The system includes a raw water tank, a defluoridation reactor, a denitrification reactor, and an outlet water tank; the outlet of the raw water tank is connected to the inlet of the defluoridation reactor, the outlet of the defluoridation reactor is connected to the inlet of the denitrification reactor, and the outlet of the denitrification reactor is connected to the outlet water tank. The raw water tank is used to store photovoltaic wastewater; The defluorination reactor reacts with fluoride ions in the photovoltaic wastewater, and the precipitate and wastewater are obtained after defluorination by the solid-liquid separation device installed in the defluorination reactor. The wastewater after defluorination enters the denitrification reactor. The denitrification reactor is equipped with denitrification packing material. The defluorinated wastewater passes through the denitrification packing material to obtain denitrified wastewater, which then enters the effluent tank.

2. The photovoltaic wastewater treatment system according to claim 1, characterized in that, The system further includes: a first reagent storage box and a second reagent storage box, wherein the first reagent storage box and the second reagent storage box are respectively used to store the first reagent and the second reagent that react with fluoride ions; The first reagent storage tank and the second reagent storage tank are respectively connected to the defluorination reactor via a first inlet pump and a second inlet pump.

3. The photovoltaic wastewater treatment system according to claim 1, characterized in that, The defluorination reactor is equipped with an inlet pool, and the raw water tank is connected to the inlet pool via a third inlet pump; the inlet pool is located below the solid-liquid separation device. The bottom of the defluorination reactor is provided with a conical sedimentation tank, which is used to store the defluorinated precipitate separated by the solid-liquid separation device. The conical sedimentation tank is located below the inlet tank.

4. The photovoltaic wastewater treatment system according to claim 3, characterized in that, The system also includes a plate and frame filter press, which is used to separate the precipitate after defluorination. The inlet end of the plate and frame filter press is connected to the screw conveyor pump, and the screw conveyor pump is connected to the conical sedimentation tank; The outlet end of the plate and frame filter press is connected to the filtrate return pump, and the filtrate return pump is connected to the inlet tank of the defluorination reactor.

5. The photovoltaic wastewater treatment system according to claim 1, characterized in that, The defluorination reactor further includes a first detector located near the outlet of the defluorination reactor, used to detect the fluoride ion content in the defluorinated wastewater.

6. The photovoltaic wastewater treatment system according to claim 1, characterized in that, The inlet of the denitrification reactor is located at the bottom of the denitrification reactor. The denitrification reactor contains denitrification packing, and a microporous baffle is provided at the bottom of the denitrification packing. The microporous baffle is located above the inlet of the denitrification reactor. The top of the denitrification reactor is connected to the inlet end of the denitrification circulation pump, and the bottom of the denitrification reactor is connected to the outlet end of the denitrification circulation pump. The denitrification circulation pump is used to draw water from the top of the denitrification reactor and pump it in from the bottom of the denitrification reactor.

7. The photovoltaic wastewater treatment system according to any one of claims 1-6, characterized in that, The outlet of the denitrification reactor is located at the top of the denitrification reactor, and the outlet of the denitrification reactor is connected to the top of the outlet tank through a first outlet pump; the bottom of the denitrification reactor is connected to the bottom of the outlet tank through a second outlet pump.

8. The photovoltaic wastewater treatment system according to claim 7, characterized in that, An aeration fan is connected to the bottom of the denitrification reactor; Or / and, the system further includes: an intermediate water tank; one side of the intermediate water tank is connected to the outlet of the defluorination reactor via an intermediate water tank inlet pump; the other side of the intermediate water tank is connected to the inlet of the denitrification reactor via an intermediate water tank outlet pump.

9. The photovoltaic wastewater treatment system according to any one of claims 1-6, characterized in that, A heating sensor is also connected to the bottom of the denitrification reactor, and the heating sensor is used to heat the denitrification reactor.

10. The photovoltaic wastewater treatment system according to any one of claims 1-6, characterized in that, The system further includes an acid inlet tank and an alkali inlet tank, which are connected to the denitrification reactor via an acid inlet pump and an alkali inlet pump, respectively. Or / and, the denitrification reactor further includes a second detector for detecting the nitrogen content and pH value within the denitrification reactor.

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