CN215667579U

CN215667579U - Coal mine water treatment system

Info

Publication number: CN215667579U
Application number: CN202022931560.2U
Authority: CN
Inventors: 张青; 张海军
Original assignee: Xi'an Huapu Water Treatment Equipment Co ltd
Current assignee: Xi'an Huapu Water Treatment Equipment Co ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2022-01-28
Anticipated expiration: 2030-12-07

Abstract

The utility model relates to a coal mine water treatment system, which comprises a buffer water tank, a primary separation device, an ultrafiltration device and a security filter, wherein the primary separation device is used for separating coal mine water into clear water and waste water; further comprising: the membrane treatment device is connected with the cartridge filter and comprises a reverse osmosis membrane, and the reverse osmosis membrane is used for performing reverse osmosis treatment on the clean water pretreated by the ultrafiltration device and the cartridge filter in sequence to obtain product water and concentrated water; the nitrogen removal device is connected with the membrane treatment device; the reaction device is respectively connected with the primary separation device, the ultrafiltration device, the security filter and the membrane treatment device; the precipitator is connected with the reaction device; the mixing reaction tower is connected with the precipitator; and the clean water tank is used for collecting the standard water obtained after the nitrogen removal device and the mixed reaction tower are treated. The utility model can carry out advanced treatment, recycling and reusing on the coal mine water, realizes the purpose of zero pollutant emission to a certain extent, and saves water resources.

Description

Coal mine water treatment system

Technical Field

The utility model relates to the technical field of sewage treatment, in particular to a coal mine water treatment system.

Background

China mainly uses underground mining, and in order to ensure safe production of coal mines, a large amount of mine water burst must be discharged, so that direct discharge wastes water resources and pollutes the environment. The mine water is treated and recycled, so that not only can the water supply contradiction of a mining area be relieved, but also the water environment can be prevented from being polluted, and economic benefits can be generated, thereby having important significance for promoting clean production of coal mines, promoting sustainable development of coal industry and promoting ecological civilized construction.

The coal mine wastewater which is discharged directly into the water body without being treated to reach the standard can cause water body eutrophication, and cause great harm and influence on the received water body and human health; the coal mine wastewater has more toxic and harmful substances due to complex components, and the higher concentration of the inorganic salt brings great difficulty to the recycling and zero discharge of the wastewater. Research shows that most of mine water treated by coal mine enterprises at present is discharged after reaching standards by adopting traditional pretreatment such as simple precipitation, filtration, biochemical treatment and the like, and is not deeply treated, recycled and reused, thereby greatly wasting water resources. Therefore, there is a need to provide a new technical solution to improve one or more of the problems in the above solutions.

It is noted that this section is intended to provide a background or context to the embodiments of the utility model that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a coal mine water treatment system that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.

The utility model provides a coal mine water treatment system, which comprises a buffer water tank, a primary separation device, an ultrafiltration device and a security filter, wherein the primary separation device is used for separating coal mine water into clear water and waste water, and the system also comprises:

the membrane treatment device is connected with the cartridge filter and comprises a reverse osmosis membrane and is used for performing reverse osmosis treatment on the clean water which is pretreated sequentially through the ultrafiltration device and the cartridge filter to obtain product water and concentrated water;

the nitrogen removal device is connected with the membrane treatment device and is used for carrying out total nitrogen adsorption treatment on the product water obtained by the membrane treatment device so as to enable the total nitrogen content concentration in the product water to be less than 0.1 ppm;

the reaction device is respectively connected with the primary separation device, the ultrafiltration device, the cartridge filter and the membrane treatment device and is used for carrying out preset treatment on the wastewater passing through the primary separation device, the ultrafiltration device and the cartridge filter and the concentrated water passing through the membrane treatment device so as to form precipitates on the wastewater and the concentrated water;

the precipitator is connected with the reaction device and is used for precipitating and separating the insoluble matters generated by the reaction device to obtain separated mixed water and solid matters;

the mixed reaction tower is connected with the precipitator and is divided into an upper layer area and a lower layer area, and the ammonia nitride in the mixed water is decomposed in the upper layer area by adding chlorine at a break point; the lower layer region is used for adsorbing the decomposed ammonia nitride;

and the clean water tank is arranged at the downstream of the nitrogen removal device and the mixed reaction tower and is used for collecting the standard water obtained after the nitrogen removal device and the mixed reaction tower are used for processing.

In the embodiment of the utility model, the system also comprises a scale inhibition dosing device which is arranged between the cartridge filter and the membrane treatment device and is used for adding a preset scale inhibition substance into clean water entering the membrane treatment device.

In the embodiment of the utility model, the preset scale inhibiting substances comprise scale inhibitors, oxidizing bactericides and reducing agents.

In the embodiment of the utility model, the nitrogen removal device comprises ion exchange resin, and the size of the ion exchange resin particles is between 0.3 and 1.2mm, and the ion exchange resin is used for carrying out total nitrogen adsorption treatment on the product water.

In the embodiment of the utility model, the ion exchange resin is ammonia nitrogen ion exchange resin; and/or, the ion exchange resin is a strongly basic anion resin.

In an embodiment of the utility model, the reaction device comprises a first material adding device and a second material adding device, the first material adding device is used for adding a flocculating agent into the reaction device, and the second material adding device is used for adding a coagulant aid into the reaction device, so that the wastewater and the insoluble substances in the concentrated water entering the reaction device are subjected to chemical reaction to form a precipitate.

In the embodiment of the utility model, the flocculating agent is PAC, and the coagulant aid is PAM.

In an embodiment of the present invention, the system further comprises a chlorine dioxide preparation device connected to the mixing reaction tower for generating chlorine dioxide by an electrolytic process to provide chlorine dioxide for the breakpoint chlorine addition.

In an embodiment of the present invention, the system includes a lift pump disposed between the precipitator and the mixing reaction tower, and configured to lift the mixed water separated by the precipitator into the mixing reaction tower.

In the embodiment of the utility model, the system also comprises a blower which is arranged in the primary separation device and used for carrying out aeration and blowing on the suspended matters adsorbed on the surface of the primary separation device.

The technical scheme provided by the embodiment of the utility model can have the following beneficial effects:

according to the coal mine water treatment system provided by the utility model, clear water is sequentially purified and denitrified by the buffer water tank, the primary separation device, the ultrafiltration device, the security filter, the membrane treatment device and the nitrogen removal device, and wastewater and concentrated water generated in the water treatment process of the primary separation device, the ultrafiltration device, the security filter and the membrane treatment device in the process are sequentially subjected to adsorption treatment of removing solid substances and nitrogen compounds by the reaction device, the precipitator and the mixed reaction tower, so that the aim of deep treatment, recycling and reutilization of the coal mine water is fulfilled, the aim of zero pollutant discharge is fulfilled to a certain extent, and water resources are saved.

Drawings

FIG. 1 shows a flow diagram of a coal mine water treatment system in an exemplary embodiment of the utility model.

In the figure: the system comprises a buffer water tank 100, a primary separation device 200, a blower 201, an ultrafiltration device 300, a cartridge filter 400, a scale inhibition and dosing device 501, a membrane treatment device 500, a nitrogen removal device 600, a reaction device 700, a first material dosing device 701, a second material dosing device 702, a precipitator 800, a mixing reaction tower 900 and a chlorine dioxide preparation device 901.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Furthermore, the drawings are merely schematic illustrations of the utility model and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities.

The embodiment of the example firstly provides a coal mine water treatment system. Referring to fig. 1, the system may include a buffer water tank 100, a primary separation device 200, an ultrafiltration device 300, and a cartridge filter 400, the primary separation device 200 being used to separate coal mine water into clean water and wastewater, and may further include a membrane treatment device 500, a nitrogen removal device 600, a reaction device 700, a precipitator 800, a mixing reaction tower 900, and a clean water tank.

The membrane treatment device 500 is connected with the cartridge filter 400, and the membrane treatment device 500 comprises a reverse osmosis membrane and is used for performing reverse osmosis treatment on the clean water pretreated by the ultrafiltration device 300 and the cartridge filter 400 in sequence to obtain product water and concentrated water; the nitrogen removal device 600 is connected with the membrane treatment device 500 and is used for carrying out total nitrogen adsorption treatment on the product water obtained by the membrane treatment device 500 so as to enable the total nitrogen content concentration in the product water to be less than 0.1 ppm; the reaction device 700 is connected with the primary separation device 200, the ultrafiltration device 300, the cartridge filter 400 and the membrane treatment device 500 respectively, and is used for performing preset treatment on the wastewater passing through the primary separation device 200, the ultrafiltration device 300 and the cartridge filter 400 and the concentrated water passing through the membrane treatment device 500 so as to form precipitates on the wastewater and the concentrated water; the precipitator 800 is connected with the reaction device 700, and is used for precipitating and separating the insoluble matters generated by the reaction device 700 to obtain separated mixed water and solid matters; the mixing reaction tower 900 is connected with the precipitator 800 and is divided into an upper layer area and a lower layer area, and the ammonia nitride in the mixed water is decomposed in the upper layer area by adding chlorine at break points; the lower layer region is used for adsorbing the decomposed ammonia nitride; the clean water tank is disposed downstream of the nitrogen removal device 600 and the mixed reaction tower 900, and is used for collecting standard water obtained after the nitrogen removal device 600 and the mixed reaction tower 900 are processed.

The clean water is sequentially purified and denitrified by the buffer water tank 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, and wastewater and concentrated water generated in the water treatment process of the primary separation device 200, the ultrafiltration device 300, the security filter 400 and the membrane treatment device 500 in the process are sequentially subjected to adsorption treatment of solid matters and nitrogen compounds by the reaction device 700, the precipitator 800 and the mixed reaction tower 900, so that the aim of deep treatment, recycling and reutilization of the coal mine water is fulfilled, the aim of zero pollutant emission is fulfilled to a certain extent, and water resources are saved.

Next, the respective structures of the above-described coal mine water treatment system in the present exemplary embodiment will be described in more detail with reference to fig. 1.

In one embodiment, the coal mine water enters the buffer pool 100 and then enters the primary separation device 200, i.e. the high-efficiency solid-liquid separation device, through the lift pump, the device can intercept substances larger than 0.1 μm in the water, and through the process, suspended substances carried in the coal mine water are largely intercepted, wherein the suspended substances refer to solid substances suspended in the water and comprise inorganic substances, organic substances, silt, clay, microorganisms and the like which are insoluble in the water. Specifically, the device bottom sets up the bagger, adopts gravity to subside, sets up ceramic filtration system above the middle part and adopts the vacuum negative pressure method, takes out the clear water to next processing procedure device in, and whole work intermittent type formula operation, the device also has certain removal effect to coal mine aquatic COD (chemical oxygen demand), ammonia nitrogen etc. substance such as suspended solid that intercepts gets into reaction unit 700 for waste water treatment after the device bottom is gathered, the clear water of branch reason then gets into ultrafiltration device 300.

The ultrafiltration device 300 is mainly used as a pretreatment system for the inlet water of the subsequent device, and prevents the subsequent device from being impacted and damaged. Ultrafiltration is a pressurized membrane separation technique, in which small molecular solutes and solvents are passed through a special membrane with a certain pore size under a certain pressure, while large molecular solutes are not passed through the membrane and remain on one side of the membrane, thus partially purifying the large molecular substances. The ultrafiltration principle is also a principle of a membrane separation process, wherein ultrafiltration utilizes a pressure active membrane to intercept colloids, particles and substances with relatively high molecular weight in water under the action of an external driving force (pressure), and water and small solute particles permeate the membrane separation process, namely, most of colloidal silica contained in water can be removed after the water passes through an ultrafiltration membrane, and a large amount of organic matters and the like can be removed. The clean water passing through the ultrafiltration device 300 enters the cartridge filter 400 to reach the membrane treatment device 500, and the cartridge filter 400, i.e. the precise filter device, is generally arranged in front of a pressure container to remove fine particles with turbidity of more than 1 degree, so as to meet the requirements of subsequent processes on water inlet, and ensure the precision of the post-stage water outlet and the safety of a post-stage membrane element.

The membrane treatment apparatus 500 includes a reverse osmosis membrane module, which is a membrane element of membrane separation technology using pressure as driving force by virtue of the function of selective permeation (semi-permeation) membranes, and is made of reverse osmosis membrane guide cloth and a central tube, and one or more reverse osmosis elements are put into a pressure-resistant casing to form a reverse osmosis module. Under the pressure effect of the clean water passing through the cartridge filter 400, most of water molecules and trace ions permeate the reverse osmosis membrane, the clean water becomes product water after being collected, the product water enters subsequent equipment through a water production pipeline, most of salt, colloid, organic matters and the like in the water cannot permeate the reverse osmosis membrane, the product water remains in a small amount of concentrated water, and the product water is discharged to the reaction device 700 through a concentrated water pipe. The membrane treatment device 500 adopts an integrated reverse osmosis device, the structure of the device is compact and reasonable, the long-term operation reliability and the maintenance requirement of the device are fully considered in the design, and a control device, a pressure gauge, an on-line conductivity meter, a flowmeter and the like are integrated on a panel, so that the device is easier to operate and use. In addition, when the reverse osmosis device is shut down, the residual water with high TDS (total dissolved solids) in the reverse osmosis membrane and the pipeline is flushed and squeezed by the product water, so that the shut-down reverse osmosis membrane is completely soaked in fresh water, membrane damage caused by natural permeation of the reverse osmosis membrane can be prevented, decontamination and descaling are performed, and the membrane treatment device 500 and the reverse osmosis membrane are effectively maintained.

The product water discharged from the membrane treatment device 500 is subjected to total nitrogen adsorption treatment such as ammonia nitrogen and nitrate radical through a nitrogen removal device 600, in one example, the nitrogen removal device 600 comprises ion exchange resin, and the size of the ion exchange resin particles is between 0.3 mm and 1.2mm, and the ion exchange resin is used for performing total nitrogen adsorption treatment on the product water. Specifically, the exchange mechanism of the ion exchange resin is chemisorption, wherein ions in a solution are firstly diffused to the surface of the resin, then diffused from the surface to the interior of the resin, then ion exchange is carried out, the exchanged ions are diffused to the surface from the interior of the resin, and finally the exchanged ions are diffused into the solution. In one example, the ion exchange resin is an ammonia nitrogen ion exchange resin; and/or, the ion exchange resin is a strongly basic anion resin. The ion exchange resin can be a resin for absorbing ammonia nitrogen in a targeted manner, and can also be a resin for absorbing nitrate ions, but the concentration of ammonia nitrogen ions/nitrate ions in the discharged water needs to be less than 0.1 ppm. The standard water passing through the nitrogen removing device 600 is discharged into the clean water tank and the standard water has reached the discharge standard.

The wastewater passing through the primary separation device 200, the ultrafiltration device 300 and the cartridge filter 400 and the concentrated water discharged from the membrane treatment device 500 enter the reaction device 700, the reaction device 700 can carry out high-efficiency coagulating sedimentation treatment on the wastewater and the concentrated water, lime materials can be added into the reaction device 700, so that preliminary chemical reaction is carried out, and then mechanical stirring reaction is carried out, so that indissolvable substances in the wastewater and the concentrated water are fully subjected to chemical reaction, so that sedimentation is formed. Then insoluble matters are precipitated and separated by the precipitator 800, for example, a circular vertical sedimentation tank is adopted, a central transmission mud scraper is arranged to obtain separated mixed water and solid matters, the solid matters are scraped by the mud scraper for subsequent treatment, and the mixed water is lifted into the mixing reaction tower 900 by a lifting pump.

The mixing reaction tower 900 is a reaction place for adding chlorine at a break point and is divided into two layers, the upper layer is an oxidation region, the lower layer is an adsorption region, the ammonia nitride in the mixed water is decomposed by adding chlorine at the break point in the upper layer, namely, chlorine dioxide is provided by the chlorine dioxide preparation device 901, the waste water entering the mixing reaction tower 900 can be decomposed due to the fact that the chlorine dioxide is a strong oxidant and a disinfectant, most of nitrogen compounds in the waste water can be oxidized, the oxidized nitrogen compounds enter the lower layer of the mixing reaction tower 900 and are adsorbed by activated carbon arranged in the lower layer, the activated carbon can also adsorb other substances in the water left in the upper layer, and the adsorbed water can be discharged to a clean water tank and meets the standard water discharge requirement.

In one embodiment, the system further comprises a scale inhibition and medicine adding device 501, which is disposed between the cartridge filter 400 and the membrane treatment device 500, and is used for adding a preset scale inhibition substance into the clean water entering the membrane treatment device 500.

Specifically, the clear water after ultrafiltration is fed with a corresponding scale inhibitor through the scale inhibitor feeding device 501, and in one example, the preset scale inhibitor includes a scale inhibitor, an oxidizing bactericide, and a reducing agent. The preset scale inhibiting substance can disperse the insoluble inorganic salt in water, and prevent or interfere the precipitation and scaling functions of the insoluble inorganic salt on the metal surface, so that the corrosion of acidic substances in water on subsequent membrane treatment settings and the like is effectively avoided, and metal ions such as iron, manganese and the like can be prevented from forming dirt on a membrane tube, thereby reducing the cleaning of the membrane and prolonging the service life of the membrane.

In one embodiment, the reaction apparatus 700 includes a first material adding apparatus 701 and a second material adding apparatus 702, the first material adding apparatus 701 is used for adding a flocculating agent to the reaction apparatus 700, and the second material adding apparatus 702 is used for adding a coagulant aid to the reaction apparatus 700, so that the wastewater and the insoluble substances in the concentrated water entering the reaction apparatus 700 are chemically reacted to form a precipitate.

Specifically, the reaction device 700 can perform high-efficiency coagulating sedimentation treatment on the wastewater and the concentrated water, and a flocculating agent and a coagulant aid can be added into the reaction device 700, and the flocculating agent and the coagulant aid are respectively added into the reaction device 700 through a first material adding device 701 and a second material adding device 702. In one example, the flocculant is PAC and the coagulant aid is PAM. Specifically, the flocculant PAC is basic aluminum chloride, the coagulant aid PAM is cationic polyacrylamide, and the PAC and the PAM can be simultaneously added into the reaction device 700, so that the wastewater entering the reaction device 700 and the insoluble substances in the concentrated water are subjected to chemical reaction to form precipitates.

In one embodiment, the system further comprises a chlorine dioxide production unit 901 connected to the mixing reaction tower 900 for generating chlorine dioxide by an electrolytic process to provide chlorine dioxide for the breakpoint chlorine addition.

Specifically, the chlorine dioxide preparation device 901 employs an electrolytic chlorine dioxide generator, which uses NaCl as a raw material to generate chlorine dioxide by electrolysis. Chlorine dioxide is a strong oxidant and disinfectant, which is generated by diaphragm-free electrolysis from widely inexpensive industrial salts or dilute solutions of seawater. In order to ensure the freshness and higher activity of the sodium hypochlorite, the device can generate chlorine dioxide while adding the generated chlorine dioxide for use. It has the same oxidizing and disinfecting effects as chlorine and chlorine compounds.

In one embodiment, the system includes a lift pump disposed between the precipitator 800 and the mixing reaction tower 900 for lifting the mixed water separated by the precipitator 800 into the mixing reaction tower 900. Specifically, the lift pump is a pump product integrating a pump, a motor, a shell and a control system, can be used for conveying sewage and dirt of particles, and can also be used for pumping clean water and corrosive media.

In one embodiment, the system further comprises a blower 201 arranged in the primary separation device 200 and used for performing aeration purging on suspended matters adsorbed on the surface of the primary separation device 200. Specifically, the coal mine water enters the buffer water tank 100 and then enters the primary separation device 200 through the lift pump, and because the primary separation is performed by adopting a ceramic ultrafiltration membrane, the suspended matters adsorbed on the surface of the membrane need to be aerated and purged, and therefore, the air blower 201 needs to be arranged in the primary separation device 200.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the utility model and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the utility model being indicated by the following claims.

Claims

1. The utility model provides a colliery well water processing system, includes buffer pool, primary separating device, ultrafiltration device and safety filter ware, primary separating device is used for dividing colliery well moisture for clear water and waste water, its characterized in that, this system still includes:

2. The coal mine water treatment system according to claim 1, further comprising a scale inhibition dosing device arranged between the cartridge filter and the membrane treatment device and used for adding a preset scale inhibition substance into clean water entering the membrane treatment device.

3. The coal mine water treatment system according to claim 1, wherein the nitrogen removal device comprises ion exchange resin, and the size of the ion exchange resin particles is between 0.3 mm and 1.2mm, and the ion exchange resin is used for carrying out total nitrogen adsorption treatment on the product water.

4. The coal mine water treatment system according to claim 3, wherein the ion exchange resin is an ammonia nitrogen ion exchange resin; and/or, the ion exchange resin is a strongly basic anion resin.

5. The coal mine water treatment system according to claim 1, wherein the reaction device comprises a first material adding device and a second material adding device, the first material adding device is used for adding a flocculating agent into the reaction device, and the second material adding device is used for adding a coagulant aid into the reaction device, so that the wastewater and the insoluble substances in the concentrated water entering the reaction device are subjected to chemical reaction to form a precipitate.

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

7. The coal mine water treatment system according to claim 1, further comprising a chlorine dioxide production device connected to the hybrid reaction tower for generating chlorine dioxide by an electrolytic process to provide chlorine dioxide for the breakpoint chlorination.

8. The coal mine water treatment system according to claim 7, comprising a lift pump disposed between the precipitator and the hybrid reaction tower for lifting the mixed water separated by the precipitator into the hybrid reaction tower.

9. The coal mine water treatment system according to claim 1, further comprising a blower arranged in the primary separation device and used for carrying out aeration purging on suspended matters adsorbed on the surface of the primary separation device.