Fluorine-containing wastewater purification treatment device

Abstract

The utility model discloses a fluorine-containing wastewater purification treatment device in the technical field of wastewater purification treatment, which comprises a microfiltration membrane system, an ultrafiltration membrane system, a nanofiltration membrane system, a mixing stirrer, an electrodialysis membrane system and a first crystallizer, a water production port of the ultrafiltration membrane system is connected with a water inlet of the mixing stirrer through a liquid conveying pipeline, a water outlet of the mixing stirrer is connected with a water inlet of the nanofiltration membrane system through a liquid conveying pipeline, and a water production port of the nanofiltration membrane system is connected with a water inlet of the electrodialysis membrane system through a liquid conveying pipeline; and a concentrated water port of the nanofiltration membrane system is communicated with the first crystallizer through a liquid conveying pipeline. According to the utility model, a multi-stage membrane separation technology is adopted, so that fluoride, heavy metals, suspended matters and other pollutants in the fluorine-containing wastewater can be efficiently removed, and a membrane concentrated solution is crystallized and separated through the crystallizer, so that the recovery of silicon elements and fluorine elements in the fluorine-containing wastewater is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater purification treatment technical field, concretely relates to a purification treatment device of fluorine-containing wastewater. BACKGROUND

[0002] In recent years, the global photovoltaic industry has developed rapidly. According to the data of the International Renewable Energy Agency (IRENA), the global photovoltaic installed capacity increased from 40 GW in 2010 to more than 1000 GW in 2022. As a leading country in the global photovoltaic industry, China's photovoltaic newly installed capacity reached 87.4 GW in 2022, ranking first in the world for several consecutive years. However, the rapidly developing photovoltaic industry is facing a large amount of wastewater generation and treatment problems. The photovoltaic industry will generate a large amount of high-concentration fluorides, heavy metals and other pollutants in the process of silicon wafer cutting, silicon wafer cleaning and equipment surface treatment. Fluorides have great harm to the environment and human health, and can also have long-term negative effects on aquatic organisms, soil and drinking water sources.

[0003] Due to the toxicity and difficulty of fluorine-containing wastewater treatment, traditional fluorine-containing photovoltaic wastewater treatment methods such as chemical precipitation and adsorption have poor treatment effect on fluorine-containing photovoltaic wastewater. At the same time of removing fluorides, it is difficult to achieve efficient recovery of fluorine elements, and the problem of secondary pollution in the treatment process is serious.

[0004] Therefore, how to efficiently and safely treat fluorine-containing photovoltaic wastewater and recover and utilize fluorine elements in fluorine-containing photovoltaic wastewater has become a key problem and future development trend in photovoltaic wastewater treatment technology. SUMMARY

[0005] Therefore, the utility model aims at the above technical problem and provides a purification treatment device of fluorine-containing wastewater.

[0006] The utility model adopts the technical scheme of: a purification treatment device of fluorine-containing wastewater, including microfiltration membrane system, ultrafiltration membrane system, nanofiltration membrane system, mixed stirrer, electrodialysis membrane system and first crystallizer, the water outlet of microfiltration membrane system is connected with the water inlet of ultrafiltration membrane system through infusion pipeline, the water outlet of ultrafiltration membrane system is connected with the water inlet of mixed stirrer through infusion pipeline, the water outlet of mixed stirrer is connected with the water inlet of nanofiltration membrane system through infusion pipeline, the water outlet of nanofiltration membrane system is connected with the water inlet of electrodialysis membrane system through infusion pipeline, the concentrated water outlet of nanofiltration membrane system is connected with first crystallizer through infusion pipeline.

[0007] Preferably, the concentrated water outlet of the ultrafiltration membrane system is connected with the second crystallizer through the infusion pipeline.

[0008] Preferably, the ultrafiltration membrane system comprises an organic ultrafiltration membrane system and a ceramic ultrafiltration membrane system, the water inlet of the organic ultrafiltration membrane system is connected with the water outlet of the microfiltration membrane system through a liquid conveying pipeline, the water inlet of the ceramic ultrafiltration membrane system is connected with the concentrated water outlet of the organic ultrafiltration membrane system through a liquid conveying pipeline, the concentrated water outlet of the ceramic ultrafiltration membrane system is connected with the second crystallizer through a liquid conveying pipeline, and the water outlet of the ceramic ultrafiltration membrane system and the water outlet of the organic ultrafiltration membrane system are connected with the water inlet of the mixing stirrer through a liquid conveying pipeline.

[0009] Preferably, the nanofiltration membrane system comprises an organic nanofiltration membrane system and a ceramic nanofiltration membrane system, the water inlet of the organic nanofiltration membrane system is connected with the water outlet of the mixing stirrer through a liquid conveying pipeline, the water inlet of the ceramic nanofiltration membrane system is connected with the concentrated water outlet of the organic nanofiltration membrane system through a liquid conveying pipeline, the concentrated water outlet of the ceramic nanofiltration membrane system is connected with the first crystallizer through a liquid conveying pipeline, and the water outlet of the ceramic nanofiltration membrane system and the water outlet of the organic nanofiltration membrane system are connected with the water inlet of the electrodialysis membrane system through a liquid conveying pipeline.

[0010] Preferably, the concentrated chamber of the electrodialysis membrane system is connected with the water inlet of the organic nanofiltration membrane system through a first reflux pipeline.

[0011] Preferably, the water inlet of the microfiltration membrane system is connected with the water outlet of the water storage tank through a liquid conveying pipeline, and the concentrated water outlet of the microfiltration membrane system is connected with the water storage tank through a second reflux pipeline.

[0012] The present application has the following beneficial effects:

[0013] The present application utilizes the membrane separation process, filters and removes the suspended matters and large-particle impurities in the fluorine-containing wastewater through the microfiltration membrane system, filters and removes the small-particle impurities, colloids and macromolecular organic matters in the fluorine-containing wastewater through the ultrafiltration membrane system, adds magnesium ions into the fluorine-containing wastewater through the mixing stirrer, filters and crystallizes the magnesium fluoride through the nanofiltration membrane system and the first crystallizer, and finally filters and removes the inorganic salt ions in the fluorine-containing wastewater through the electrodialysis membrane system, so that the fluorine-containing wastewater is efficiently removed from the fluorine-containing wastewater, the fluorine element in the wastewater is recovered, and the dual goals of harmless treatment and resource utilization are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic view of the fluorine-containing wastewater purification treatment device.

[0015] Mark explanation in the drawing:

[0016] 10, water storage tank;

[0017] 20, microfiltration membrane system; 21, second reflux pipeline;

[0018] 30, ultrafiltration membrane system; 31, organic ultrafiltration membrane system; 32, ceramic ultrafiltration membrane system;

[0019] 40, mixing stirrer;

[0020] 50, nanofiltration membrane system; 51, organic nanofiltration membrane system; 52, ceramic nanofiltration membrane system;

[0021] 60, electrodialysis membrane system; 61, first return pipeline;

[0022] 70, first crystallizer;

[0023] 80, second crystallizer. DETAILED DESCRIPTION

[0024] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate the present application, and are not a limitation on the present application.

[0025] In the description of the present application, it should be pointed out that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present application, it should be pointed out that unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] In addition, in the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0028] Embodiments, such as Figure 1As shown, a purification device for fluoride-containing wastewater includes a microfiltration membrane system 20, an ultrafiltration membrane system 30, a nanofiltration membrane system 50, a mixer 40, an electrodialysis membrane system 60, and a first crystallizer 70. The product outlet of the microfiltration membrane system 20 is connected to the inlet of the ultrafiltration membrane system 30 via a liquid delivery pipeline. The product outlet of the ultrafiltration membrane system 30 is connected to the inlet of the mixer 40 via a liquid delivery pipeline. The outlet of the mixer 40 is connected to the inlet of the nanofiltration membrane system 50 via a liquid delivery pipeline. The product outlet of the nanofiltration membrane system 50 is connected to the inlet of the electrodialysis membrane system 60 via a liquid delivery pipeline. The concentrate outlet of the nanofiltration membrane system 50 is connected to the first crystallizer 70 via a liquid delivery pipeline.

[0029] This invention utilizes membrane separation technology. First, a microfiltration membrane system 20 is used to filter out suspended solids and large particulate impurities in fluoride-containing wastewater. Then, an ultrafiltration membrane system 30 is used to filter out small particulate impurities, colloids, and large molecular organic matter in the fluoride-containing wastewater. Magnesium ions are added to the fluoride-containing wastewater through a mixing agitator 40. Magnesium fluoride is then filtered and crystallized through a nanofiltration membrane system 50 and a first crystallizer 70. Finally, an electrodialysis membrane system 60 is used to filter out inorganic salt ions from the fluoride-containing wastewater. This achieves efficient removal of fluorides, heavy metals, and other pollutants from the wastewater, while simultaneously recovering fluoride from the fluoride-containing wastewater, thus achieving the dual goals of harmless treatment and resource utilization.

[0030] Specific embodiment 1, such as Figure 1 As shown, a purification and treatment device for fluoride-containing wastewater includes an influent storage tank 10, a microfiltration membrane system 20, an ultrafiltration membrane system 30, a nanofiltration membrane system 50, a mixer 40, an electrodialysis membrane system 60, a first crystallizer 70, and a second crystallizer 80.

[0031] The inlet of the microfiltration membrane system 20 is connected to the outlet of the inlet water storage tank 10 through a liquid delivery pipeline, and a pressure boosting pump is installed on the liquid delivery pipeline between the microfiltration membrane system 20 and the inlet water storage tank 10. The microfiltration membrane system 20 can filter out suspended solids and large particulate impurities and other pollutants in fluoride-containing wastewater, which serves as a pretreatment process for the subsequent ultrafiltration membrane system 30 and nanofiltration membrane system 50.

[0032] Preferably, the concentrate outlet of the microfiltration membrane system 20 is connected to the inlet water storage tank 10 through the second return pipeline 21 to achieve multiple concentrations of the concentrate from the microfiltration membrane system 20.

[0033] The water outlet of the microfiltration membrane system 20 is connected to the water inlet of the ultrafiltration membrane system 30 through a liquid conveying pipeline, and a pressure boosting pump is installed on the liquid conveying pipeline between the microfiltration membrane system 20 and the ultrafiltration membrane system 30; the water outlet of the ultrafiltration membrane system 30 is connected to the water inlet of the mixing stirrer 40 through a liquid conveying pipeline, and the concentrated water outlet of the ultrafiltration membrane system 30 is connected to the second crystallizer 80 through a liquid conveying pipeline for recycling the particulate silicon.

[0034] Preferably, the ultrafiltration membrane system 30 comprises an organic ultrafiltration membrane system 31 and a ceramic ultrafiltration membrane system 32, the water inlet of the organic ultrafiltration membrane system 31 is connected to the water outlet of the microfiltration membrane system 20 through a liquid conveying pipeline, the water outlet of the organic ultrafiltration membrane system 31 is connected to the water inlet of the mixing stirrer 40 through a liquid conveying pipeline, and a pressure boosting pump is installed on the liquid conveying pipeline between the organic ultrafiltration membrane system 31 and the microfiltration membrane system 20; the water inlet of the ceramic ultrafiltration membrane system 32 is connected to the concentrated water outlet of the organic ultrafiltration membrane system 31 through a liquid conveying pipeline, and a pressure boosting pump is installed on the liquid conveying pipeline between the ceramic ultrafiltration membrane system 32 and the organic ultrafiltration membrane system 31, the concentrated water outlet of the ceramic ultrafiltration membrane system 32 is connected to the second crystallizer 80 through a liquid conveying pipeline, and the water outlet of the ceramic ultrafiltration membrane system 32 is connected to the water inlet of the mixing stirrer 40 through a liquid conveying pipeline.

[0035] The reason for such an arrangement is that the organic ultrafiltration membrane system 31 takes the water produced by the microfiltration membrane system 20 as the inlet water, can filter out small particulate impurities, colloids and macromolecular organic matter and other pollutants in the wastewater, and the water produced by the organic ultrafiltration membrane system 31 is used as the inlet water of the nanofiltration membrane system 50; the ceramic ultrafiltration membrane system 32 takes the concentrated water (concentrated solution) of the organic ultrafiltration membrane system 31 as the inlet water, can further concentrate the Si particles in the concentrated solution of the ultrafiltration membrane system 30, and realize the enrichment of Si particles; the concentrated solution of the ceramic ultrafiltration membrane system 32 flows into the second crystallizer 80, which can complete the crystallization purification of particulate Si in the wastewater and realize the recycling of silicon elements in the fluorine-containing wastewater.

[0036] The water outlet of the mixing stirrer 40 is connected to the water inlet of the nanofiltration membrane system 50 through a liquid conveying pipeline.

[0037] Preferably, the inorganic salt added in the mixing stirrer 40 is magnesium chloride (MgCl2), and the type of the stirrer is one or more of paddle type, propeller type, propeller type, turbine type, anchor type, frame type and screw belt type, which aims to fully mix and uniform the MgCl2 in the solution.

[0038] The reason for such an arrangement is that after the water produced by the ultrafiltration membrane system 30 enters the mixing stirrer 40, MgCl2 is added to the mixing stirrer 40, which is fully mixed with the solution, and is used to precipitate Mg 2+ F in the fluorine-containing wastewater -The MgF2 particles or suspensions are formed by combining; after the solution is fully mixed and reacted, it flows into the nanofiltration membrane system 50.

[0039] The product water outlet of the nanofiltration membrane system 50 is connected to the inlet of the electrodialysis membrane system 60 via a liquid delivery pipeline. A pressure boosting pump is installed on the liquid delivery pipeline between the nanofiltration membrane system 50 and the electrodialysis membrane system 60. The concentrate outlet of the nanofiltration membrane system 50 is connected to the first crystallizer 70 via a liquid delivery pipeline for the recovery of magnesium fluoride solids in the concentrate.

[0040] Specific embodiment 2, such as Figure 1 As shown, a purification and treatment device for fluoride-containing wastewater includes an influent storage tank 10, a microfiltration membrane system 20, an ultrafiltration membrane system 30, a nanofiltration membrane system 50, a mixer 40, an electrodialysis membrane system 60, and a first crystallizer 70.

[0041] The inlet of the microfiltration membrane system 20 is connected to the outlet of the inlet water storage tank 10 via a liquid delivery pipeline, and a pressure boosting pump is installed on the liquid delivery pipeline between the microfiltration membrane system 20 and the inlet water storage tank 10. The microfiltration membrane system 20 can filter out suspended solids and large particulate impurities and other pollutants in fluoride-containing wastewater, serving as a pretreatment process for the subsequent ultrafiltration membrane system 30 and nanofiltration membrane system 50.

[0042] The product outlet of the microfiltration membrane system 20 is connected to the inlet of the ultrafiltration membrane system 30 via a liquid delivery pipeline, and a pressure boosting pump is installed on the liquid delivery pipeline between the microfiltration membrane system 20 and the ultrafiltration membrane system 30. The product outlet of the ultrafiltration membrane system 30 is connected to the inlet of the mixing agitator 40 via a liquid delivery pipeline, and the concentrate outlet of the ultrafiltration membrane system 30 is connected to the second crystallizer 80 via a liquid delivery pipeline for recovering particulate silicon from the concentrate.

[0043] The mixer 40 is used to add magnesium ions to fluoride-containing wastewater, and the outlet of the mixer 40 is connected to the inlet of the nanofiltration membrane system 50 through a liquid delivery pipeline. The concentrate outlet of the nanofiltration membrane system 50 is connected to the first crystallizer 70 through a liquid delivery pipeline for recovering magnesium fluoride solids from the concentrate.

[0044] Preferably, the nanofiltration membrane system 50 includes an organic nanofiltration membrane system 51 and a ceramic nanofiltration membrane system 52. The inlet of the organic nanofiltration membrane system 51 is connected to the outlet of the mixer 40 through a liquid delivery pipeline. The inlet of the ceramic nanofiltration membrane system 52 is connected to the concentrate outlet of the organic nanofiltration membrane system 51 through a liquid delivery pipeline. The concentrate outlet of the ceramic nanofiltration membrane system 52 is connected to the first crystallizer 70 through a liquid delivery pipeline. The product outlets of the ceramic nanofiltration membrane system 52 and the organic nanofiltration membrane system 51 are connected to the inlet of the electrodialysis membrane system 60 through liquid delivery pipelines.

[0045] The reason for such arrangement is that the organic nanofiltration membrane system 51 takes the water outlet of the mixing stirrer 40 as the water inlet, can filter out small-molecule organic matters, MgF2 suspension, MgCl2 and other high-valence salt ions in the fluorine-containing wastewater, and the water outlet of the organic nanofiltration membrane system 51 is used as the water inlet of the subsequent electrodialysis membrane system 60. - The reason for such arrangement is that the organic nanofiltration membrane system 51 takes the water outlet of the mixing stirrer 40 as the water inlet, can filter out small-molecule organic matters, MgF2 suspension, MgCl2 and other high-valence salt ions in the fluorine-containing wastewater, and the water outlet of the organic nanofiltration membrane system 51 is used as the water inlet of the subsequent electrodialysis membrane system 60. - The reason for such arrangement is that the organic nanofiltration membrane system 51 takes the water outlet of the mixing stirrer 40 as the water inlet, can filter out small-molecule organic matters, MgF2 suspension, MgCl2 and other high-valence salt ions in the fluorine-containing wastewater, and the water outlet of the organic nanofiltration membrane system 51 is used as the water inlet of the subsequent electrodialysis membrane system 60.

[0046] The water outlet of the nanofiltration membrane system 50 is connected with the water inlet of the electrodialysis membrane system 60 through a liquid conveying pipeline, and a pressure boosting pump is installed on the liquid conveying pipeline between the nanofiltration membrane system 50 and the electrodialysis membrane system 60.

[0047] The reason for such arrangement is that the organic nanofiltration membrane system 51 takes the water outlet of the mixing stirrer 40 as the water inlet, can filter out small-molecule organic matters, MgF2 suspension, MgCl2 and other high-valence salt ions in the fluorine-containing wastewater, and the water outlet of the organic nanofiltration membrane system 51 is used as the water inlet of the subsequent electrodialysis membrane system 60.

[0048] Specifically, the electrodialysis membrane system 60 takes the water outlet of the nanofiltration membrane system 50 as the water inlet, and two water outlets are generated after the treatment of the electrodialysis membrane system 60, wherein the water outlet of the dilute chamber is pure water, and the water outlet of the concentrated chamber is concentrated water, and the concentrated chamber of the electrodialysis membrane system 60 is connected with the water inlet of the organic nanofiltration membrane system 51 through the first reflux pipeline 61, so that the concentrated water outlet of the electrodialysis membrane system 60 is refluxed to the front end of the nanofiltration membrane system 50 through the pipeline.

[0049] The power supply of the electrodialysis membrane system 60 can be network electricity, solar energy, wind energy and other new energy power.

[0050] Compared with the prior art, the utility model has at least the following beneficial technical effects:

[0051] The multi-stage membrane separation technology can not only efficiently remove fluorides, heavy metals, suspensions and other pollutants in the fluorine-containing wastewater, but also realize the recovery of silicon elements and fluorine elements in the fluorine-containing wastewater through the crystallization separation of the membrane concentrated liquid by the crystallizer.

[0052] The utility model discloses through multistage membrane filtration and electrodialysis technology, can efficiently remove fluoride in fluorine-containing waste water, and the fluorine-containing photovoltaic waste water is treated as pure water, and the water quality meets the reuse standard or production standard.

[0053] The utility model discloses through the mode of adding MgCl2, makes fluorine ion and magnesium ion form magnesium chloride precipitate, and through two stage nanofiltration system to the concentration of MgF2 solution, cooperates the crystallization of crystallizer to magnesium chloride, realizes the recycling of fluorine element in fluorine-containing waste water, is favorable to the utilization efficiency of fluorine resource, avoids the waste of resources.

[0054] The utility model discloses through full membrane method treatment craft, can filter out various impurities in waste water, and the stable high efficiency of filtration level, can effectively ensure water quality safety, make the effluent water quality can reach pure water quality, can be used for life and production.

[0055] The membrane treatment technology in the utility model compared with traditional chemical treatment method, can effectively reduce energy consumption and chemical medicine use, reduce secondary pollution, simultaneously, the utility model provides power energy through wind power, photovoltaic and other new energy, can effectively improve the consumption level of new energy power, realizes green low carbon production.

[0056] The utility model discloses through using full membrane treatment automation control system, can real -time monitoring each parameter, guarantees the efficient operation and stability of device, is convenient for maintenance and management.

[0057] The above-mentioned is only the preferred implementation mode of the utility model, should point out, for ordinary skill for this technical field person, on the premise of not departing from the technical principle of the utility model, can also make a number of improvements and replacement, these improvements and replacement also should be regarded as the protection range of the utility model.

Claims

1. An apparatus for purifying fluorine-containing waste water, characterized by comprising: The system comprises a microfiltration membrane system (20), an ultrafiltration membrane system (30), a nanofiltration membrane system (50), a mixing stirrer (40), an electrodialysis membrane system (60) and a first crystallizer (70), the water outlet of the microfiltration membrane system (20) is connected with the water inlet of the ultrafiltration membrane system (30) through a liquid conveying pipeline, the water outlet of the ultrafiltration membrane system (30) is connected with the water inlet of the mixing stirrer (40) through a liquid conveying pipeline, the water outlet of the mixing stirrer (40) is connected with the water inlet of the nanofiltration membrane system (50) through a liquid conveying pipeline, the water outlet of the nanofiltration membrane system (50) is connected with the water inlet of the electrodialysis membrane system (60) through a liquid conveying pipeline, and the concentrated water outlet of the nanofiltration membrane system (50) is connected with the first crystallizer (70) through a liquid conveying pipeline.

2. The device for purifying fluorine-containing waste water according to claim 1, wherein The concentrated water outlet of the ultrafiltration membrane system (30) is connected with the second crystallizer (80) through a liquid conveying pipeline.

3. The apparatus for purifying fluorine-containing waste water according to claim 2, wherein The ultrafiltration membrane system (30) comprises an organic ultrafiltration membrane system (31) and a ceramic ultrafiltration membrane system (32), the water inlet of the organic ultrafiltration membrane system (31) is connected with the water outlet of the microfiltration membrane system (20) through a liquid conveying pipeline, the water inlet of the ceramic ultrafiltration membrane system (32) is connected with the concentrated water outlet of the organic ultrafiltration membrane system (31) through a liquid conveying pipeline, the concentrated water outlet of the ceramic ultrafiltration membrane system (32) is connected with the second crystallizer (80) through a liquid conveying pipeline, and the water outlet of the ceramic ultrafiltration membrane system (32) and the water outlet of the organic ultrafiltration membrane system (31) are connected with the water inlet of the mixing stirrer (40) through a liquid conveying pipeline.

4. The apparatus for purifying fluorine-containing waste water according to claim 1, wherein The nanofiltration membrane system (50) comprises an organic nanofiltration membrane system (51) and a ceramic nanofiltration membrane system (52), the water inlet of the organic nanofiltration membrane system (51) is connected with the water outlet of the mixing stirrer (40) through a liquid conveying pipeline, the water inlet of the ceramic nanofiltration membrane system (52) is connected with the concentrated water outlet of the organic nanofiltration membrane system (51) through a liquid conveying pipeline, the concentrated water outlet of the ceramic nanofiltration membrane system (52) is connected with the first crystallizer (70) through a liquid conveying pipeline, and the water outlet of the ceramic nanofiltration membrane system (52) and the water outlet of the organic nanofiltration membrane system (51) are connected with the water inlet of the electrodialysis membrane system (60) through a liquid conveying pipeline.

5. The apparatus for purifying fluorine-containing waste water according to claim 4, wherein The concentrated chamber of the electrodialysis membrane system (60) is connected with the water inlet of the organic nanofiltration membrane system (51) through a first reflux pipeline (61).

6. The apparatus for purifying fluorine-containing waste water according to claim 1, wherein The water inlet of the microfiltration membrane system (20) is connected with the water outlet of the water inlet storage tank (10) through a liquid conveying pipeline, and the concentrated water outlet of the microfiltration membrane system (20) is connected with the water inlet storage tank (10) through a second reflux pipeline (21).

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