Mine water zero discharge treatment system

Abstract

The utility model discloses a mine water zero discharge treatment system. The system comprises a water collecting bin; the first-stage separation membrane device is used for carrying out oil removal and turbidity removal treatment on mine water in the water collection bin; the first-stage waste liquid treatment system is used for performing first-stage separation on waste liquid obtained after treatment of the first-stage separation membrane device, clarified liquid obtained after first-stage separation flows back to a water collecting bin to be collected for next-step treatment, and waste residues obtained after first-stage separation of the first-stage waste liquid treatment system are used as product coal; the reverse osmosis device is used for treating salt in the mine water treated by the primary separation membrane device, so that high-quality production water is obtained and can be used as water for emulsion; the secondary waste liquid treatment system is used for carrying out secondary separation on the waste liquid treated by the reverse osmosis device, clear liquid obtained by separation flows back to the primary waste liquid treatment system for treatment, and the waste liquid obtained by secondary separation of the secondary waste liquid treatment system is used as a water source of a coal cleaning plant. According to the utility model, the treated product water, strong brine and precipitated coal can be recycled, and no waste is discharged, so that zero discharge of mine water is realized.

Description

Technical Field

[0001] The present application relates to a mine water zero-discharge treatment system, belonging to the technical field of mine water treatment. Background Art

[0002] In the process of mining coal and other mineral resources, groundwater is extracted or polluted due to mining activities, and the groundwater (mine water) formed is treated. This treatment is intended to eliminate harmful substances that may be contained in the water, such as minerals, sediments, acid and alkali substances, and possible harmful microorganisms, in order to meet environmental protection standards and prevent direct discharge from causing damage to the environment. For example, the utility model patent with announcement number CN 201694922 U discloses a mine water treatment device, specifically: through the wastewater automatic extraction area, wastewater lifting area, electrical control area, chemical agent addition area, chemical precipitation chamber one, chemical precipitation chamber two, chemical precipitation chamber three, intermediate clarification area, filtered water lifting area, and filter adsorption area to form an integral device, so that the water flow inside the treatment equipment is three-dimensional, and the layout is reasonable, so as to achieve effective use of space, save floor space, and reduce energy consumption and engineering investment. However, in the process of water treatment, a certain amount of concentrated water, waste debris, etc. will be generated, and the device cannot be reasonably treated and utilized, resulting in pollution or waste. Utility Model Content

[0003] According to one aspect of the present application, a zero-discharge treatment system for mine water is provided, which allows the treated product water, concentrated brine and precipitated coal to be recycled without discharge of waste, and has good social and economic benefits.

[0004] A mine water zero discharge treatment system, characterized by comprising:

[0005] A water collection tank is used to collect mine water to be treated on the ground;

[0006] A primary separation membrane device, the inlet of which is connected to the outlet of the water collection bin through a pipeline, and is used to remove oil and turbidity from the mine water in the water collection bin;

[0007] A primary waste liquid treatment system, used for performing primary separation on the waste liquid obtained after treatment by the primary separation membrane device, the waste liquid treatment system is connected to the water collection bin through a pipeline, and is used for returning the clarified liquid obtained by the primary separation to the water collection bin for collection and further treatment, and the waste residue obtained by the primary separation of the primary waste liquid treatment system is used as product coal;

[0008] A reverse osmosis device, connected to the primary separation membrane device through a pipeline, for treating the salt in the mine water treated by the primary separation membrane device to obtain product water;

[0009] A secondary waste liquid treatment system, used for performing secondary separation on the waste liquid obtained after treatment by the reverse osmosis device, the secondary waste liquid treatment system is connected to the primary waste liquid treatment system through a pipeline, and is used for returning the separated clarified liquid to the primary waste liquid treatment system for further treatment, and the waste liquid obtained by secondary separation of the secondary waste liquid treatment system is used as a water source for the coal washing plant;

[0010] The product water tank is used to store the obtained product water.

[0011] Furthermore, the primary waste liquid treatment system comprises:

[0012] A backwash water collection tank, wherein the inlet of the backwash water collection tank is connected to the primary separation membrane device through a pipeline, a floating oil collection device is provided on the top of the backwash water collection tank, and the floating oil is collected for secondary recycling, and a clarified liquid reflux device is provided in the middle of the backwash water collection tank and connected to the water collection tank through a pipeline;

[0013] A dehydration device, wherein the inlet of the dehydration device is connected to the sewage outlet of the backwash water collection bin through a pipeline, the drainage outlet of the dehydration device is connected to the water collection bin through a pipeline, and the waste slag obtained by dehydration of the dehydration device is used as product coal.

[0014] Furthermore, the secondary waste liquid treatment system comprises:

[0015] Water softening device, used to reduce the presence of hard ions in product water,

[0016] A secondary separation membrane device, wherein the inlet of the secondary separation membrane device is connected to the outlet of the water softening device through a pipeline, and the secondary separation membrane device is connected to the backwash water collection tank through a pipeline, and is used to return the clarified liquid separated by the secondary separation membrane device to the water collection tank for collection and further treatment;

[0017] A secondary reverse osmosis device, wherein the inlet of the secondary reverse osmosis device is connected to the sewage outlet of the secondary separation membrane device through a pipeline, and is used for secondary treatment of the waste liquid obtained after treatment by the secondary separation membrane device. The secondary reverse osmosis device is connected to the product water tank through a pipeline, and the product water obtained after treatment is transported to the product water tank for collection. The waste liquid obtained by the secondary reverse osmosis device is used as a water source for the coal washing plant.

[0018] Furthermore, the processing system further comprises:

[0019] a first intermediate water tank, the inlet of which is connected to the outlet of the first separation membrane device through a pipeline, and is used to store intermediate water obtained after treatment by the first separation membrane device;

[0020] The outlet of the first intermediate water tank is connected to the inlet of the reverse osmosis device through a pipeline;

[0021] A first backwash pump is installed between the first intermediate water tank and the first separation membrane device, and is used to perform backwash treatment on the first separation membrane device using the intermediate water in the first intermediate water tank.

[0022] Furthermore, the secondary waste liquid treatment system comprises:

[0023] A second intermediate water tank, the inlet of which is connected to the outlet of the secondary separation membrane device through a pipeline, and is used to store intermediate water obtained after treatment by the secondary separation membrane device;

[0024] The outlet of the second intermediate water tank is connected to the inlet of the secondary reverse osmosis device through a pipeline;

[0025] A second backwash pump is installed between the second intermediate water tank and the secondary separation membrane device, and is used to perform backwash treatment on the secondary separation membrane device using the intermediate water in the second intermediate water tank.

[0026] Furthermore, the primary separation membrane device and the secondary separation membrane device both include a pressure vessel and a filter membrane structure installed inside the pressure vessel;

[0027] The filtration membrane structure is a PolyCera series H-UF-40-8040 membrane element;

[0028] The pressure vessel is a pressure vessel containing 20 3-cores;

[0029] The filtration membrane structure comprises 60 membrane elements.

[0030] The beneficial effects of this application include:

[0031] The present application provides a zero-discharge mine water treatment system, which enables the product water, concentrated brine and precipitated coal in the treatment to be recycled without discharge of waste, and has good social and economic benefits; at the same time, no reagents need to be added during the mine water treatment process; in response to fluctuations in the quality and quantity of mine water, the device has strong impact resistance and can effectively treat mine water containing high suspended solids; it adopts an integrated form, occupies a small area, has a high treatment rate, and is easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of a mine water zero discharge treatment system in one embodiment of the present application;

[0033] Figure 2This is a structural schematic diagram of a primary separation membrane device / secondary separation membrane device of a mine water zero discharge treatment system in one embodiment of the present application;

[0034] Figure 3 A side view of a primary separation membrane device / secondary separation membrane device of a mine water zero discharge treatment system in one embodiment of the present application Figure 1 ;

[0035] Figure 4 A side view of a primary separation membrane device / secondary separation membrane device of a mine water zero discharge treatment system in one embodiment of the present application Figure 2 ;

[0036] List of components and figure marks: 1-water collection tank; 2-primary separation membrane device; 3-reverse osmosis device; 4-product water tank; 5-backwash water collection tank; 6-dehydration device; 7-water softening device; 8-secondary separation membrane device; 9-secondary reverse osmosis device; 10-first intermediate water tank; 11-second intermediate water tank. DETAILED DESCRIPTION

[0037] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0038] See also Figure 1-2 , a mine water zero discharge treatment system, characterized by comprising:

[0039] A water collection tank 1, used for collecting mine water to be treated on the ground;

[0040] A primary separation membrane device 2, wherein the inlet of the primary separation membrane device 2 is connected to the outlet of the water collection bin 1 through a pipeline, and is used for removing oil and turbidity from the mine water in the water collection bin 1;

[0041] A primary waste liquid treatment system, used for performing primary separation on the waste liquid obtained after being treated by the primary separation membrane device 2, the waste liquid treatment system is connected to the water collection bin 1 through a pipeline, and is used for returning the clarified liquid obtained by the primary separation to the water collection bin 1 for collection and further treatment, and the waste residue obtained by the primary separation of the primary waste liquid treatment system is used as product coal;

[0042] A reverse osmosis device 3 is connected to the primary separation membrane device 2 through a pipeline, and is used to treat the salt in the mine water treated by the primary separation membrane device 2, thereby obtaining product water;

[0043] A secondary waste liquid treatment system, used for performing secondary separation on the waste liquid obtained after treatment by the reverse osmosis device 3, the secondary waste liquid treatment system is connected to the primary waste liquid treatment system through a pipeline, and is used for returning the separated clarified liquid to the primary waste liquid treatment system for further treatment, and the waste liquid obtained by secondary separation of the secondary waste liquid treatment system is used as a water source for the coal washing plant;

[0044] The product water tank 4 is used to store the obtained product water, which is high-quality production water and can be used as emulsion water, etc.

[0045] Specifically, the mine water inlet pipe is connected to the water collection tank 1 to collect the mine water to be treated. The water collection tank 1 is respectively connected to the primary separation membrane device 2, the backwash water collection tank 5 drainage pipe, and the dehydration device 6 supernatant drainage pipe; the primary separation membrane device 2 is respectively connected to the reverse osmosis device 3 and the backwash water collection pipe of the backwash water collection tank 5; the reverse osmosis device 3 is respectively connected to the product water tank 4 and the concentrated water pipe; the product water tank 4 is respectively connected to the product water delivery pipe and the secondary reverse osmosis device 9; the backwash water collection tank 5 is respectively connected to the water collection tank 1, the dehydration device 6, and the secondary separation membrane device 8; the water softening device 7 is connected to the secondary separation membrane device 8; the secondary separation membrane device 8 is respectively connected to the backwash water collection bin 5 and the secondary reverse osmosis device 9; the secondary reverse osmosis device 9 is respectively connected to the product water bin 4 and the secondary reverse osmosis concentrated water discharge pipe; the dehydration device 6 is connected to the water collection bin 1. The system achieves the effect of recycling product water, concentrated brine and precipitated coal through the primary separation membrane device 2, the primary waste liquid treatment system, the reverse osmosis system and the secondary waste liquid treatment system, without the discharge of waste, and has good social and economic benefits. At the same time, no reagent is required in the process of treating mine water; the process flow is short; in view of the fluctuation of water quality and water quantity of mine water, this application has strong impact resistance and can effectively treat mine water containing high suspended solids; it adopts an integrated form, occupies a small area, has a high treatment rate, and is easy to maintain.

[0046] The primary waste liquid treatment system comprises:

[0047] A backwash water collecting tank 5, the inlet of which is connected to the primary separation membrane device 2 via a pipeline, a floating oil collecting device is provided on the top of the backwash water collecting tank 5, and the floating oil is collected for secondary recycling, and a clarified liquid reflux device is provided in the middle of the backwash water collecting tank 5 and connected to the water collecting tank 1 via a pipeline;

[0048] Among them, the floating oil collection device is a mechanical device specially used to recover oil spills and oil-water mixtures on the water surface without changing their physical and chemical properties. At the same time, the following equipment can be used to achieve it: the floating oil collection device includes two rollers, an oil collection tank, a light diaphragm pump, an oil level sensor, a float that provides buoyancy, a steel hose, etc. Its working principle is that the entire floating oil collection device floats on the water surface, and the lower edges of the two rollers are immersed under the liquid surface. The floating oil on the water surface adheres to the lipophilic surface of the rollers through rotation, and then is scraped to the oil collection tank by the scraper. There is a return hole at the bottom of the oil collection tank that is connected to the external water pool. As more and more oil is scraped in by the scraper, the water in the oil collection tank is gradually squeezed out. When the oil level sensor detects that there is a lot of oil in the oil collection tank, the light diaphragm pump is started to pump the oil to the waste oil tank.

[0049] The dehydration device 6, the inlet of the dehydration device 6 is connected to the sewage outlet of the backwash water collecting bin 5 through a pipeline, the drainage outlet of the dehydration device 6 is connected to the water collecting bin 1 through a pipeline, and the waste slag obtained by dehydration of the dehydration device 6 is used as product coal.

[0050] Specifically, the dehydration device uses a disc filter cloth dehydration mechanism, which includes a main machine and an auxiliary machine. The main machine includes a main shaft, a main shaft transmission device, a slurry tank, a dehydration filter plate, a filter cloth, a filtrate pipeline, a stirring device, a gas-liquid conversion and distribution device, a filter cloth cleaning device, a filter reduction spray device and a dry oil automatic lubrication device; the auxiliary machine includes a gas-water separation drain tank, a high-pressure air bag, a water ring vacuum pump, and an electrical control cabinet.

[0051] During the dehydration process, the sludge is first continuously input into the disc dehydrator tank through the pipeline; when working, the dehydration plate immersed in the tank is under the negative pressure of the vacuum pump, and the surface of the dehydration plate adsorbs solid particles to form a layer of accumulation, and the liquid passes through the dehydration plate and the filtrate pipeline to the distribution head to reach the drain pipe. Under the action of the spindle reducer, the filter cake adsorbed on the filter fan rotates to the drying area, and is continuously dehydrated under the action of vacuum; after the filter cake is dried, the spindle rotates to the unloading area, and the unloading is carried out under the action of the blowing or scraper device; after unloading, the dehydrator disc enters the material carrying area again, and the above process is repeated.

[0052] The secondary waste liquid treatment system comprises:

[0053] Water softening device 7, used to reduce the presence of hard ions in product water,

[0054] Specifically, the water softening device uses a Yunnan famous membrane water softening device.

[0055] A secondary separation membrane device 8, wherein the inlet of the secondary separation membrane device 8 is connected to the outlet of the water softening device 7 via a pipeline, and the secondary separation membrane device 8 is connected to the backwash water collection tank 5 via a pipeline, so as to return the clarified liquid separated by the secondary separation membrane device to the water collection tank 1 for collection and further treatment;

[0056] A secondary reverse osmosis device 9, wherein the inlet of the secondary reverse osmosis device 9 is connected to the sewage outlet of the secondary separation membrane device 8 through a pipeline, and is used for secondary treatment of the waste liquid obtained after treatment by the secondary separation membrane device 8. The secondary reverse osmosis device 9 is connected to the product water tank 4 through a pipeline, and the product water obtained after treatment is transported to the product water tank 4 for collection. The waste liquid obtained by the secondary reverse osmosis device 9 is used as a water source for the coal washing plant.

[0057] The processing system further comprises:

[0058] A first intermediate water tank 10, the inlet of which is connected to the outlet of the primary separation membrane device 2 through a pipeline, and is used to store intermediate water obtained after being treated by the primary separation membrane device 2;

[0059] The outlet of the first intermediate water tank 10 is connected to the inlet of the reverse osmosis device 3 through a pipeline;

[0060] A first backwash pump is installed between the first intermediate water tank 10 and the primary separation membrane device 2 for backwashing the primary separation membrane device 2 using the intermediate water in the first intermediate water tank 10 .

[0061] The secondary waste liquid treatment system comprises:

[0062] A second intermediate water tank 11, the inlet of which is connected to the outlet of the secondary separation membrane device 8 through a pipeline, and is used to store the intermediate water obtained after being treated by the secondary separation membrane device 8;

[0063] The outlet of the second intermediate water tank 11 is connected to the inlet of the secondary reverse osmosis device 9 through a pipeline;

[0064] A second backwash pump is installed between the second intermediate water tank 11 and the secondary separation membrane device 8 for backwashing the secondary separation membrane device 8 using the intermediate water in the second intermediate water tank 11 .

[0065] Specifically, the mine water transported from underground to the surface of the present application is collected into the water collection tank 1 through the water pipe. Under the action of the water pump, the mine water stored in the water collection tank 1 enters the primary separation membrane device 2 for separation treatment, and at the same time removes the suspended matter and trace oil in the raw water. The separated produced water enters the reverse osmosis device 3 through the membrane produced water pipe, and the concentrated water produced by the secondary separation membrane device 8 enters the backwash water collection tank 5. The product water treated by the reverse osmosis device 3 enters the product water tank 4 for storage, and the concentrated water produced by the reverse osmosis device 3 enters the water softening device 7, and is further desalinated after softening and removing hardness; the drainage of the water softening device 7 enters the secondary separation membrane device 8 for filtration, and enters the secondary reverse osmosis device 9. The produced water of the secondary reverse osmosis device 9 enters the product water tank, and the concentrated water can be used by the coal preparation plant. The backwash wastewater discharged from the backwash operation of the first / secondary separation membrane device 8 is also discharged into the backwash water collection tank 5. The produced water stored in the product water tank can be transported to various water points in the mining area for production use. The supernatant in the backwash water collection bin 5 flows back to the water collection bin 1, and the bottom sediment is concentrated and dehydrated by the dehydration device 6 and then sent to the product coal system.

[0066] It is worth noting that, according to the operation conditions, the backwash operation of the first / secondary separation membrane device 8 is carried out regularly. At this time, the water supply from the water collection tank 1 is stopped, and the water produced from the product water tank 4 is transported to the first / secondary separation membrane device 8 through the backwash pump for backwash operation; the generated backwash wastewater is transported to the backwash water collection tank through the backwash drain pipe for collection. After the backwash wastewater in the backwash water collection tank is left to stand, the supernatant on the upper layer is transferred to the water collection tank 1; the sludge on the lower layer is transferred to the dehydration device 6.

[0067] The primary separation membrane device 2 and the secondary separation membrane device 8 both include a pressure vessel and a filter membrane structure installed inside the pressure vessel;

[0068] The processing system further comprises:

[0069] Controller;

[0070] Power distribution module, which provides safe and reliable power supply for the entire system, ensuring that all operations and maintenance activities can be carried out safely and conveniently;

[0071] A water quality monitoring module, which is connected to the controller, the water collection tank, the primary separation membrane device, the reverse osmosis device and the product water tank, and is used to monitor the pH value and turbidity of the mine water in each state;

[0072] Among them, each pipeline of the present application is provided with a regulating valve, and each of the regulating valves is connected to the control system.

[0073] The control valves are all smart valves, specifically the Hailin SRV series smart control valves, which have the functions of intelligent measurement, intelligent control and network communication of pipeline fluid parameters such as pressure difference, temperature, flow, etc., and can implement feedback on the operating status and change trend of the device, thereby realizing effective intelligent monitoring.

[0074] The filtration membrane structure is a PolyCera series H-UF-40-8040 membrane element;

[0075] The pressure vessel is a pressure vessel containing 20 3-cores;

[0076] The filtration membrane structure comprises 60 membrane elements.

[0077] Among them, the filtration membrane breaks the boundary between traditional organic membranes and inorganic ceramic membranes, and has the characteristics of oil resistance, high temperature resistance, acid and alkali resistance, high flux, and easy recovery after backwashing.

[0078] In this application, a 3-core design is adopted, and 60 membrane elements require 20 3-core pressure vessels.

[0079] At the same time, considering the convenience of piping and maintenance, the pressure vessels on the horizontally installed membrane rack are designed to be arranged in 2 rows, and each row is equipped with no more than 6 layers of pressure vessels (too many layers will make the membrane rack too high and the center of gravity unstable). The 20 pressure vessels of this system are divided into 2 membrane groups, each membrane group has 10 membrane shells, divided into 2 rows, each row has 5 layers. The specific installation design of the primary / secondary separation membrane device is as follows Figure 2-4 shown.

[0080] The first / second backwash pump can be a conventional vertical or horizontal water purification centrifugal pump.

[0081] The mine water indicators before treatment in this application are shown in Table 1:

[0082] Table 1

[0083] Serial number project unit Design value 1 temperature ℃ normal temperature 2 pH 7-8 3 Suspended Matter mg / L ≤500 4 Oil mg / L ≤200

[0084] The indicators of the product water obtained after treatment by this application are as follows Figure 2 As shown:

[0085] Table 2

[0086] Serial number project unit National Standards Control indicators 1 Turbidity NTU ≤5 ≤1 2 Suspended particle size mm ＜0.3 ＜0.1 3 pH 6.0～9.0 6.0～9.0 4 Coliform bacteria pcs / L ＜3 ＜3 5 BOD5 mg / L ≤10 ≤5 6 TDS ≤1000 ≤850 7 CaCO3 mg / L ≤450 ≤50 8 <![CDATA[Cl - ]]> mg / L ≤200 ≤10

[0087] It can be seen that the oil removal and turbidity removal effects of the mine water treated by the system in this application are significant and are significantly lower than the national standard.

[0088] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A mine water zero discharge treatment system, characterized in that: include: A water collection tank is used to collect mine water to be treated on the ground; A primary separation membrane device, the inlet of which is connected to the outlet of the water collection bin through a pipeline, and is used to remove oil and turbidity from the mine water in the water collection bin; A primary waste liquid treatment system, used for performing primary separation on the waste liquid obtained after treatment by the primary separation membrane device, the waste liquid treatment system is connected to the water collection bin through a pipeline, and is used for returning the clarified liquid obtained by the primary separation to the water collection bin for collection and further treatment, and the waste residue obtained by the primary separation of the primary waste liquid treatment system is used as product coal; A reverse osmosis device, connected to the primary separation membrane device, for treating the salt in the mine water treated by the primary separation membrane device, thereby obtaining product water; A secondary waste liquid treatment system, used for performing secondary separation on the waste liquid obtained after treatment by the reverse osmosis device, the secondary waste liquid treatment system is connected to the primary waste liquid treatment system through a pipeline, and is used for returning the separated clarified liquid to the primary waste liquid treatment system for further treatment, and the waste liquid obtained by secondary separation of the secondary waste liquid treatment system is used as a water source for the coal washing plant; The product water tank is used to store the obtained product water.

2. A mine water zero discharge treatment system according to claim 1, characterized in that: The primary waste liquid treatment system comprises: A backwash water collection tank, wherein the inlet of the backwash water collection tank is connected to the primary separation membrane device through a pipeline, a floating oil collection device is provided on the top of the backwash water collection tank, and the floating oil is collected for secondary recycling, and a clarified liquid reflux device is provided in the middle of the backwash water collection tank and connected to the water collection tank through a pipeline; A dehydration device, wherein the inlet of the dehydration device is connected to the sewage outlet of the backwash water collection bin through a pipeline, the drainage outlet of the dehydration device is connected to the water collection bin through a pipeline, and the waste slag obtained by dehydration of the dehydration device is used as product coal.

3. A mine water zero discharge treatment system according to claim 2, characterized in that: The secondary waste liquid treatment system comprises: Water softening device, used to reduce the presence of hard ions in product water, A secondary separation membrane device, wherein the inlet of the secondary separation membrane device is connected to the outlet of the water softening device through a pipeline, and the secondary separation membrane device is connected to the backwash water collection tank through a pipeline, and is used to return the clarified liquid separated by the secondary separation membrane device to the water collection tank for collection and further treatment; A secondary reverse osmosis device, wherein the inlet of the secondary reverse osmosis device is connected to the sewage outlet of the secondary separation membrane device through a pipeline, and is used for secondary treatment of the waste liquid obtained after treatment by the secondary separation membrane device. The secondary reverse osmosis device is connected to the product water tank through a pipeline, and the product water obtained after treatment is transported to the product water tank for collection. The waste liquid obtained by the secondary reverse osmosis device is used as a water source for the coal washing plant.

4. A mine water zero discharge treatment system according to claim 1, characterized in that: The processing system further comprises: a first intermediate water tank, the inlet of which is connected to the outlet of the first separation membrane device through a pipeline, and is used to store intermediate water obtained after treatment by the first separation membrane device; The outlet of the first intermediate water tank is connected to the inlet of the reverse osmosis device through a pipeline; A first backwash pump is installed between the first intermediate water tank and the first separation membrane device, and is used to perform backwash treatment on the first separation membrane device using the intermediate water in the first intermediate water tank.

5. A mine water zero discharge treatment system according to claim 3, characterized in that: The secondary waste liquid treatment system comprises: A second intermediate water tank, the inlet of which is connected to the outlet of the secondary separation membrane device through a pipeline, and is used to store intermediate water obtained after treatment by the secondary separation membrane device; The outlet of the second intermediate water tank is connected to the inlet of the secondary reverse osmosis device through a pipeline; A second backwash pump is installed between the second intermediate water tank and the secondary separation membrane device, and is used to perform backwash treatment on the secondary separation membrane device using the intermediate water in the second intermediate water tank.

6. A mine water zero discharge treatment system according to claim 3, characterized in that: The primary separation membrane device and the secondary separation membrane device both include a pressure vessel and a filter membrane structure installed inside the pressure vessel; The filtration membrane structure is a PolyCera series H-UF-40-8040 membrane element; The pressure vessel is a pressure vessel containing 20 3-cores; The filtration membrane structure comprises 60 membrane elements.

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