A coal mine well water treatment system

Abstract

The present invention relates to a coal mine well water treatment system, which includes a buffer water tank, a primary separation device, an ultrafiltration device, and a security filter. The primary separation device is used to separate the coal mine well water into clear water and wastewater. It further includes: a membrane treatment device connected to the security filter. The membrane treatment device includes a reverse osmosis membrane and is used to perform reverse osmosis treatment on the clear water pretreated successively by the ultrafiltration device and the security filter to obtain product water and concentrated water; a nitrogen removal device is connected to the membrane treatment device; a reaction device is respectively connected to the primary separation device, the ultrafiltration device, the security filter, and the membrane treatment device; a sedimentator is connected to the reaction device; a mixing reaction tower is connected to the sedimentator; a clear water tank is used to collect the standard water obtained after being treated by the nitrogen removal device and the mixing reaction tower. The present invention can deeply treat and recycle the coal mine well water, achieve the purpose of zero pollutant discharge to a certain extent, and save water resources.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly to a coal mine well water treatment system. Background Art

[0002] In China, underground mining is mainly carried out. To ensure the safe production of coal mines, a large amount of mine water inrush must be discharged. Direct discharge not only wastes water resources but also pollutes the environment.

[0003] If the coal mine wastewater is directly discharged into the water body without being treated up to the standard, it will cause eutrophication of the water body, posing great harm and impact on the receiving water body and human health; due to the complex composition, many toxic and harmful substances, and relatively high concentration of inorganic salts in the coal mine wastewater, it brings great difficulties to the recycling and zero discharge of the wastewater. Through investigation, it is found that at present, most coal mine enterprises treat the mine water by simple traditional pretreatment such as precipitation, filtration, and biochemical treatment, and barely meet the discharge standard, without deep treatment and recycling, which greatly wastes water resources. Therefore, it is necessary to provide a new technical solution to improve one or more problems existing in the above solution.

[0004] It should be noted that this part aims to provide background or context for the embodiments of the present invention described in the claims. The description herein is not admitted to be prior art merely because it is included in this part. Summary of the Invention

[0005] The purpose of the present invention is to provide a coal mine well water treatment system, thereby at least to some extent overcoming one or more problems caused by the limitations and defects of related technologies.

[0006] The present invention provides a coal mine well water treatment system, including a buffer pool, a primary separation device, an ultrafiltration device, and a security filter. The primary separation device is used to separate the coal mine well water into clear water and wastewater. The system further includes:

[0007] A membrane treatment device, connected to the security filter. The membrane treatment device includes a reverse osmosis membrane, and is used to perform reverse osmosis treatment on the clear water pretreated by passing through the ultrafiltration device and the security filter in sequence to obtain product water and concentrated water;

[0008] A nitrogen removal device, connected to the membrane treatment device, and is used to perform total nitrogen adsorption treatment on the product water obtained by the membrane treatment device, so that the total nitrogen content concentration in the product water is less than 0.1 ppm;

[0009] A reaction device, respectively connected to the primary separation device, the ultrafiltration device, the security filter, and the membrane treatment device, and is used to perform preset treatment on the wastewater passing through the primary separation device, the ultrafiltration device, and the security filter, and the concentrated water passing through the membrane treatment device, so that the wastewater and the concentrated water form a precipitate;

[0010] A precipitator, connected to the reaction device, for precipitating and separating the insoluble substances generated by the reaction device to obtain separated mixed water and solid substances;

[0011] A mixed reaction tower, connected to the precipitator, is divided into an upper layer area and a lower layer area. The upper layer area decomposes the ammonia nitrogen compounds in the mixed water by breakpoint chlorination; the lower layer area is used for adsorbing and treating the decomposed ammonia nitrogen compounds;

[0012] A clear water tank, arranged downstream of the nitrogen removal device and the mixed reaction tower, for collecting the standard water obtained after being treated by the nitrogen removal device and the mixed reaction tower.

[0013] In an embodiment of the present invention, the system further includes a scale inhibitor dosing device, arranged between the security filter and the membrane treatment device, for adding a preset scale inhibitor to the clear water entering the membrane treatment device.

[0014] In an embodiment of the present invention, the preset scale inhibitor includes scale inhibitor, oxidation biocide, and reducing agent.

[0015] In an embodiment of the present invention, the nitrogen removal device includes ion exchange resin, and the size of the ion exchange resin particles is between 0.3 and 1.2 mm, for total nitrogen adsorption treatment of the product water.

[0016] In an embodiment of the present invention, the ion exchange resin is ammonia nitrogen ion exchange resin; and / or, the ion exchange resin is strongly basic anion resin.

[0017] In an embodiment of the present invention, the reaction device includes a first material dosing device and a second material dosing device. The first material dosing device is used to add a flocculant to the reaction device, and the second material dosing device is used to add a coagulant aid to the reaction device, so that the insoluble substances in the waste water and concentrated water entering the reaction device undergo a chemical reaction to form a precipitate.

[0018] In an embodiment of the present invention, the flocculant is PAC, and the coagulant aid is PAM.

[0019] In an embodiment of the present invention, the system further includes a chlorine dioxide preparation device, connected to the mixed reaction tower, for generating chlorine dioxide by electrolysis to provide chlorine dioxide for the breakpoint chlorination.

[0020] In an embodiment of the present invention, the system includes a lift pump, arranged between the precipitator and the mixed reaction tower, for lifting the mixed water separated by the precipitator into the mixed reaction tower.

[0021] In an embodiment of the present invention, the system further includes a blower, which is disposed inside the primary separation device and is used to perform aeration and purging on the suspended matter adsorbed on the surface of the primary separation device.

[0022] The technical solution provided by the embodiment of the present invention may include the following beneficial effects:

[0023] According to a coal mine well water treatment system provided by the present invention, the clear water is sequentially purified and denitrified through a buffer pool, a primary separation device, an ultrafiltration device, a security filter, a membrane treatment device, and a nitrogen removal device, and the wastewater and concentrated water generated during the water treatment processes of the primary separation device, the ultrafiltration device, the security filter, and the membrane treatment device in the above processes are sequentially passed through a reaction device, a precipitator, and a mixed reaction tower for solid matter removal and nitrogen compound adsorption treatment, so as to achieve the purpose of deep treatment and recycling of coal mine well water, and to a certain extent, also achieve the purpose of zero pollutant discharge, and save water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A flowchart of a coal mine well water treatment system in an exemplary embodiment of the present invention is shown.

[0025] In the figure: buffer pool 100, primary separation device 200, blower 201, ultrafiltration device 300, security filter 400, scale inhibitor dosing device 501, membrane treatment device 500, nitrogen removal device 600, reaction device 700, first material dosing device 701, second material dosing device 702, precipitator 800, mixed reaction tower 900, chlorine dioxide preparation device 901. DETAILED DESCRIPTION

[0026] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this invention will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art. The features, structures, or characteristics described can be combined in any suitable manner in one or more embodiments.

[0027] In addition, the drawings are only schematic illustrations of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repeated description will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0028] In this example embodiment, a coal mine well water treatment system is first provided. Refer to Figure 1As shown in the figure, the system may include a buffer pool 100, a primary separation device 200, an ultrafiltration device 300, and a security filter 400. The primary separation device 200 is used to separate the coal mine well water into clean water and wastewater. It may also include a membrane treatment device 500, a nitrogen removal device 600, a reaction device 700, a sedimentation tank 800, a mixing reaction tower 900, and a clean water tank.

[0029] The membrane treatment device 500 is connected to the security filter 400. The membrane treatment device 500 includes a reverse osmosis membrane and is used to perform reverse osmosis treatment on the clean water pretreated by passing through the ultrafiltration device 300 and the security filter 400 in sequence to obtain product water and concentrated water. The nitrogen removal device 600 is connected to the membrane treatment device 500 and is used to perform total nitrogen adsorption treatment on the product water obtained by the membrane treatment device 500 so that the total nitrogen content concentration in the product water is less than 0.1 ppm. The reaction device 700 is respectively connected to the primary separation device 200, the ultrafiltration device 300, the security filter 400, and the membrane treatment device 500, and is used to perform preset treatment on the wastewater from the primary separation device 200, the ultrafiltration device 300, and the security filter 400, as well as the concentrated water from the membrane treatment device 500, so that the wastewater and the concentrated water form precipitates. The sedimentation tank 800 is connected to the reaction device 700 and performs sedimentation separation on the insoluble substances generated by the reaction device 700 to obtain separated mixed water and solid substances. The mixing reaction tower 900 is connected to the sedimentation tank 800 and is divided into an upper layer area and a lower layer area. The upper layer area decomposes the ammonia nitrogen compounds in the mixed water by breakpoint chlorination. The lower layer area is used to perform adsorption treatment on the decomposed ammonia nitrogen compounds. The clean water tank is arranged downstream of the nitrogen removal device 600 and the mixing reaction tower 900 and is used to collect the standard water obtained after being treated by the nitrogen removal device 600 and the mixing reaction tower 900.

[0030] Through the buffer pool 100, the primary separation device 200, the ultrafiltration device 300, the security filter 400, the membrane treatment device 500, and the nitrogen removal device 600, the clean water is purified and denitrified in sequence, and the wastewater and concentrated water generated during the water treatment processes of the primary separation device 200, the ultrafiltration device 300, the security filter 400, and the membrane treatment device 500 in the above process are sequentially subjected to solid matter removal and nitrogen compound adsorption treatment through the reaction device 700, the sedimentation tank 800, and the mixing reaction tower 900, thereby achieving the purpose of deep treatment, recycling, and reuse of coal mine well water, achieving the purpose of zero pollutant discharge to a certain extent, and saving water resources.

[0031] Next, reference will be made to Figure 1 to describe each structure of the above coal mine well water treatment system in the exemplary embodiment in more detail.

[0032] In one embodiment, the coal mine well water enters the buffer pool 100 and then enters the primary separation device 200, i.e., the high-efficiency solid-liquid separation device, through a lift pump. This device can intercept substances larger than 0.1 μm in the water. After this process, a large amount of suspended matter carried in the coal mine well water is intercepted. The suspended matter refers to solid substances suspended in the water, including inorganic substances, organic substances, sediment, clay, microorganisms, etc. that are insoluble in water. Specifically, a mud hopper is provided at the bottom of the device, and gravity sedimentation is adopted. Above the middle part, a ceramic filtration system is provided and the vacuum negative pressure method is used to pump the clear water into the next treatment process device. Moreover, the whole work runs intermittently. This device also has a certain removal effect on COD (chemical oxygen demand), ammonia nitrogen, etc. in the coal mine well water. The intercepted suspended matter and other substances accumulate at the bottom of the device and then enter the reaction device 700 for wastewater treatment, and the separated clear water enters the ultrafiltration device 300.

[0033] The ultrafiltration device 300 mainly serves as a pretreatment system for the water entering the subsequent device to prevent impact and damage to the subsequent device. Ultrafiltration is a pressure-driven membrane separation technology. That is, under a certain pressure, small molecule solutes and solvents pass through a special membrane with a certain pore size, while macromolecule solutes cannot pass through and remain on one side of the membrane, so that the macromolecule substances are partially purified. The ultrafiltration principle is also a principle of membrane separation process. Ultrafiltration uses a pressure-activated membrane to intercept colloids, particles and substances with relatively high molecular weights in water under the action of an external driving force (pressure), while water and small solute particles pass through the membrane for the separation process. That is, when water passes through the ultrafiltration membrane, most of the colloidal silicon contained in the water can be removed, and a large amount of organic substances, etc. can also be removed. The clear water passing through the ultrafiltration device 300 enters the security filter 400 and then reaches the membrane treatment device 500. The security filter 400, i.e., the precision filtration device, is generally set before the pressure vessel to remove fine particles with a turbidity of more than 1 degree to meet the requirements of the subsequent process for the influent water, so as to ensure the effluent accuracy and the safety of the subsequent stage membrane elements.

[0034] The membrane treatment device 500 includes a reverse osmosis membrane module. Reverse osmosis is a membrane separation technology with pressure as the driving force by means of the function of a selectively permeable (semi-permeable) membrane. The membrane element is made of a reverse osmosis membrane, a diversion cloth, a central tube, etc. One or more reverse osmosis elements are installed in a pressure-resistant housing to form a reverse osmosis module. Under the action of pressure, most of the water molecules and trace ions in the clear water passing through the security filter 400 permeate through the reverse osmosis membrane and are collected to become product water, which enters the subsequent equipment through the product water pipeline. Most of the salts, colloids, organic substances, etc. in the water cannot permeate through the reverse osmosis membrane and remain in a small amount of concentrated water, which is discharged to the reaction device 700 through the concentrated water pipe. The membrane treatment device 500 adopts an integrated reverse osmosis device with a compact and reasonable structure. In the design, the long-term operation reliability and maintenance requirements of the equipment are fully considered, and control devices, pressure gauges, on-line conductivity meters, flow meters, etc. are integrated on the panel, making it easier to operate and use. In addition, when the reverse osmosis device is out of service, the product water is used to wash and squeeze out the high-TDS (total dissolved solids) residual water stored in the reverse osmosis membrane and pipeline, so that the out-of-service reverse osmosis membrane is completely immersed in fresh water, which can prevent membrane damage caused by the natural osmosis of the reverse osmosis membrane, remove dirt and scale, and effectively maintain the membrane treatment device 500 and the reverse osmosis membrane.

[0035] The product water discharged from the membrane treatment device 500 also needs to be subjected to total nitrogen adsorption treatment such as ammonia nitrogen and nitrate by the nitrogen removal device 600. In one example, the nitrogen removal device 600 includes ion exchange resin, and the size of the ion exchange resin particles is between 0.3 and 1.2 mm, which is used for total nitrogen adsorption treatment of the product water. Specifically, the exchange mechanism of the ion exchange resin is chemical adsorption. First, the ions in the solution diffuse to the surface of the resin, then diffuse from the surface to the inside of the resin, and then ion exchange occurs. The exchanged ions diffuse from the inside of the resin to the surface, and finally the exchanged ions diffuse into the solution. In one example, the ion exchange resin is ammonia nitrogen ion exchange resin; and / or, the ion exchange resin is a strongly basic anion resin. The ion exchange resin can be specifically selected as a resin for adsorbing ammonia nitrogen or a resin for adsorbing nitrate ions, but it is necessary to make the concentration of ammonia nitrogen ions / nitrate ions in the discharged water less than 0.1 ppm. The standard water passing through the nitrogen removal device 600 will be discharged into the clear water tank, and the standard water has reached the external discharge standard.

[0036] The wastewater that has passed through the primary separation device 200, ultrafiltration device 300, and security filter 400, as well as the concentrated water discharged from the membrane treatment device 500, all enter the reaction device 700. The reaction device 700 can perform efficient coagulation and sedimentation treatment on the wastewater and concentrated water. Lime-like materials can be added to the reaction device 700 to carry out preliminary chemical reactions, and then mechanical stirring reactions are carried out to allow the insoluble substances in the wastewater and concentrated water to fully undergo chemical reactions to form precipitates. Then, the insoluble substances are separated by a sedimentation device 800. For example, a circular vertical flow sedimentation tank is used, and a central drive sludge scraper is set up to obtain the separated mixed water and solids. The solids are scraped away by the sludge scraper for subsequent treatment, and the mixed water is lifted by a lift pump to the mixing reaction tower 900.

[0037] The mixing reaction tower 900 is the place for breakpoint chlorination reaction and is divided into two layers. The upper layer is the oxidation area, and the lower layer is the adsorption area. In the upper layer area, the ammonia nitrogen compounds in the mixed water are decomposed by breakpoint chlorination, that is, chlorine dioxide is provided by the chlorine dioxide preparation device 901. Since chlorine dioxide is a strong oxidant and disinfectant, it can decompose the wastewater entering the mixing reaction tower 900, oxidize most of the nitrogen compounds in the wastewater, and the oxidized nitrogen compounds will enter the lower layer of the mixing reaction tower 900 and be adsorbed by the activated carbon set in the lower layer. The activated carbon can also adsorb other substances in the water left in the upper layer. The water after adsorption will be discharged to the clear water tank and meet the standard discharge water requirements.

[0038] In one embodiment, the system further includes a scale inhibitor dosing device 501, which is arranged between the security filter 400 and the membrane treatment device 500 and is used to add a preset scale inhibitor substance to the clear water entering the membrane treatment device 500.

[0039] Specifically, the clear water after ultrafiltration is added with corresponding scale inhibitor agents through the scale inhibitor dosing device 501. In one example, the preset scale inhibitor substance includes scale inhibitor, oxidative biocide, and reducing agent. The preset scale inhibitor substance can disperse the insoluble inorganic salts in water, prevent or interfere with the precipitation and scaling functions of insoluble inorganic salts on the metal surface, thus effectively avoiding the corrosion of subsequent membrane treatment equipment and other equipment by acidic substances in water, and preventing the formation of dirt by metal ions such as iron and manganese on the membrane tubes, thereby reducing the cleaning of the membrane and extending the service life of the membrane.

[0040] In one embodiment, the reaction device 700 includes a first material dosing device 701 and a second material dosing device 702. The first material dosing device 701 is used to add a flocculant to the reaction device 700, and the second material dosing device 702 is used to add a coagulant aid to the reaction device 700 to enable the insoluble substances in the wastewater and concentrated water entering the reaction device 700 to undergo chemical reactions to form precipitates.

[0041] Specifically, the reaction device 700 can perform efficient coagulation and sedimentation treatment on wastewater and concentrated water. Flocculants and coagulant aids can be added to the reaction device 700. The flocculants and coagulant aids are respectively added to the reaction device 700 through the first material addition device 701 and the second material addition device 702. In one example, the flocculant is PAC and the coagulant aid is PAM. Specifically, the flocculant PAC is basic aluminum chloride, and the coagulant aid PAM is cationic polyacrylamide. PAC and PAM can be added to the reaction device 700 simultaneously, so that the insoluble substances in the wastewater and concentrated water entering the reaction device 700 undergo chemical reactions and form precipitates.

[0042] In one embodiment, the system further includes a chlorine dioxide preparation device 901, which is connected to the mixing reaction tower 900 and is used to generate chlorine dioxide by electrolysis to provide chlorine dioxide for breakpoint chlorination.

[0043] Specifically, the chlorine dioxide preparation device 901 uses an electrolytic chlorine dioxide generator, which uses NaCl as a raw material to electrolyze and generate chlorine dioxide. Chlorine dioxide is a strong oxidant and disinfectant. It is generated by taking industrial salt or dilute seawater solution, which is widely available and inexpensive, and undergoing diaphragm-free electrolysis. To ensure the freshness and high activity of sodium hypochlorite and to ensure the effect, the generated chlorine dioxide is added and used while the device is generating. Compared with chlorine and chlorine compounds, it has the same oxidizing and disinfecting effects.

[0044] In one embodiment, the system includes a lift pump, which is arranged between the sedimentator 800 and the mixing reaction tower 900 and is used to lift the mixed water separated by the sedimentator 800 into the mixing reaction tower 900. Specifically, the lift pump is a pump product integrating a pump, a motor, a housing, and a control system. It can be used to convey sewage and dirt with particles, and can also be used to pump clean water and corrosive media.

[0045] In one embodiment, the system further includes a blower 201, which is arranged in the primary separation device 200 and is used to perform aeration and purging on the suspended matter adsorbed on the surface of the primary separation device 200. Specifically, the coal mine well water enters the buffer pool 100, and then enters the primary separation device 200 through a lift pump. Since the primary separation uses a ceramic ultrafiltration membrane and it is necessary to aerate and purge the suspended matter adsorbed on the membrane surface, a blower 201 needs to be arranged in the primary separation device 200.

[0046] A coal mine well water treatment system provided by the present invention purifies and denitrifies clear water through a buffer pool, a primary separation device, an ultrafiltration device, a security filter, a membrane treatment device, and a nitrogen removal device in sequence, and treats the wastewater and concentrated water generated during the water treatment process of the primary separation device, the ultrafiltration device, the security filter, and the membrane treatment device in the above processes through a reaction device, a sedimentator, and a mixing reaction tower for solid matter removal and nitrogen compound adsorption treatment, thereby achieving the purpose of deep treatment, recycling, and reuse of coal mine well water, realizing the purpose of zero pollutant discharge to a certain extent, and saving water resources.

[0047] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0048] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present invention, unless otherwise expressly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include indirect contact between the first and second features through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0051] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0052] Other embodiments of the present invention will be readily conceived by those skilled in the art after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include known common general knowledge or conventional technical means in the technical field not disclosed by the present invention. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present invention are pointed out by the appended claims.

Claims

1. A coal mine well water treatment system, including a buffer pool, a primary separation device, an ultrafiltration device and a security filter, wherein the primary separation device is used to separate the coal mine well water into clean water and wastewater, and is characterized in that, The system further includes: a membrane treatment device connected to the security filter. The membrane treatment device includes a reverse osmosis membrane and is used for performing reverse osmosis treatment on the clear water pretreated by passing through the ultrafiltration device and the security filter in sequence to obtain product water and concentrated water; a nitrogen removal device connected to the membrane treatment device and used for performing total nitrogen adsorption treatment on the product water obtained by the membrane treatment device so that the total nitrogen content concentration in the product water is less than 0.1 ppm; a reaction device connected to the primary separation device, the ultrafiltration device, the security filter, and the membrane treatment device respectively and used for performing preset treatment on the wastewater passing through the primary separation device, the ultrafiltration device, and the security filter, and the concentrated water passing through the membrane treatment device so that the wastewater and the concentrated water form a precipitate; a precipitator connected to the reaction device and used for performing precipitation separation on the insoluble substances generated by the reaction device to obtain separated mixed water and solid substances; a mixing reaction tower connected to the precipitator and divided into an upper layer area and a lower layer area. The upper layer area decomposes the ammonia nitride in the mixed water by breakpoint chlorination; the lower layer area is used for performing adsorption treatment on the decomposed ammonia nitride; a clear water tank arranged downstream of the nitrogen removal device and the mixing reaction tower and used for collecting the standard water obtained after being treated by the nitrogen removal device and the mixing reaction tower; a chlorine dioxide preparation device connected to the mixing reaction tower and used for generating chlorine dioxide by electrolysis to provide chlorine dioxide for the breakpoint chlorination; The system further includes a blower arranged in the primary separation device and used for performing aeration purging on the suspended substances adsorbed on the surface of the primary separation device.

2. The coal mine water treatment system according to claim 1, characterized in that, The system further includes a scale inhibitor dosing device arranged between the security filter and the membrane treatment device and used for adding a preset scale inhibitor substance to the clear water entering the membrane treatment device.

3. The coal mine water treatment system according to claim 2, characterized in that, The preset scale inhibitor substance includes a scale inhibitor, an oxidation biocide, and a reducing agent.

4. The coal mine water treatment system according to claim 1, characterized in that, The nitrogen removal device includes ion exchange resin, and the size of the ion exchange resin particles is between 0.3 and 1.2 mm and is used for performing total nitrogen adsorption treatment on the product water.

5. The coal mine water treatment system according to claim 1, characterized in that, The reaction device includes a first material dosing device and a second material dosing device. The first material dosing device is used for adding a flocculant to the reaction device, and the second material dosing device is used for adding a coagulant aid to the reaction device so that the insoluble substances in the wastewater and the concentrated water entering the reaction device undergo a chemical reaction to form a precipitate.

6. The coal mine water treatment system according to claim 5, characterized in that, The flocculant is PAC, and the coagulant aid is PAM.

7. The coal mine water treatment system according to claim 1, wherein, The system includes a lift pump arranged between the precipitator and the mixing reaction tower and used for lifting the mixed water separated by the precipitator to the mixing reaction tower.

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