Mine wastewater treatment system

Abstract

The utility model provides a mine wastewater treatment system. The mine wastewater treatment system comprises a pretreatment unit, a self-cleaning filter, a first ultraviolet sterilization device, an ultrafiltration unit, a second ultraviolet sterilization device, a security filter and a reverse osmosis unit which are connected in sequence, the first ultraviolet sterilization device is used for removing bacteria and viruses in the wastewater; the second ultraviolet sterilization device is used for re-sterilizing bacteria and viruses of the wastewater output by the ultrafiltration unit. According to the system, new chemical agents cannot be introduced into mine wastewater, so that secondary pollution caused by chemical substance residues in water is avoided, the water quality of produced water is improved, the treated wastewater is purer, subsequent deep treatment processes such as reverse osmosis are facilitated, and the water quality is improved. And the problem of unstable water quality caused by inaccurate dosing is solved. Moreover, through two times of ultraviolet disinfection treatment on the wastewater, the service life and the replacement period of the ultrafiltration membrane, the reverse osmosis membrane and the filter element are effectively prolonged, the maintenance cost is reduced, and the economic benefit is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of mine water treatment technology, and in particular to a mine wastewater treatment system. Background Technology

[0002] In mine wastewater treatment, sterilization is a crucial step. The presence of microorganisms not only directly erodes and fouls membrane modules, affecting the performance of ultrafiltration and reverse osmosis units, but also significantly impacts the long-term performance of the entire mine wastewater treatment system. Typically, large amounts of chemicals, such as bactericides and reducing agents, are added during pretreatment to control the total bacterial count in the incoming water. During the operation and maintenance of ultrafiltration and reverse osmosis membranes, a series of strict operations and treatments are required to prevent scaling, microbial growth, hydrolysis, and oxidation of the membrane modules. However, the addition of large amounts of chemicals requires precise control, which is prone to deviations during operation. Furthermore, prolonged addition of chemicals to mine wastewater can lead to oxidation of the reverse osmosis membrane in the ultrafiltration unit, shortening the system's lifespan and increasing maintenance costs. Therefore, this paper proposes a mine wastewater treatment system to address these issues. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a mine wastewater treatment system that solves the problem that chemical sterilization can lead to operational deviations or oxidation of membrane components in various units, thereby affecting the service life of the system and increasing operation and maintenance costs.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A mine wastewater treatment system includes a pretreatment unit, a self-cleaning filter, a first ultraviolet sterilization device, an ultrafiltration unit, a second ultraviolet sterilization device, a security filter, and a reverse osmosis unit.

[0006] The inlet of the pretreatment unit is connected to the mine wastewater, and the inlet of the self-cleaning filter is connected to the outlet of the pretreatment unit.

[0007] The inlet end of the first ultraviolet sterilization device is connected to the outlet end of the self-cleaning filter, and the inlet end of the ultrafiltration unit is connected to the outlet end of the first ultraviolet sterilization device to remove bacteria and viruses from the wastewater.

[0008] The inlet of the second ultraviolet sterilization device is connected to the outlet of the ultrafiltration unit, and the outlet of the second ultraviolet sterilization device is connected to the inlet of the security filter, for the purpose of re-sterilizing the wastewater output by the ultrafiltration unit for bacteria and viruses.

[0009] The inlet end of the reverse osmosis unit is connected to the outlet end of the security filter.

[0010] Furthermore, the first ultraviolet sterilization device is a medium-pressure ultraviolet sterilization device.

[0011] Furthermore, the second ultraviolet sterilization device is a medium-pressure ultraviolet sterilization device or a low-pressure ultraviolet sterilization device.

[0012] Furthermore, the pretreatment unit includes a pretreatment device, a pretreatment product water tank, and a pretreatment product water input component, wherein the pretreatment product water input component includes a first water supply pump and a first electric valve;

[0013] The outlet end of the pretreatment device is connected to the inlet end of the pretreatment product water tank, and the outlet end of the pretreatment product water tank is connected to the self-cleaning filter. The first water supply pump and the first electric valve are installed on the pipeline connecting the pretreatment product water tank and the self-cleaning filter.

[0014] Furthermore, the ultrafiltration unit includes an ultrafiltration device, an ultrafiltration product water tank, and an ultrafiltration product water input component, wherein the ultrafiltration product water input component includes a second water supply pump and a second electric valve;

[0015] The inlet end of the ultrafiltration device is connected to the outlet end of the first ultraviolet sterilization device, the outlet end of the ultrafiltration device is connected to the inlet end of the ultrafiltration product water tank, the outlet end of the ultrafiltration product water tank is connected to the inlet end of the second ultraviolet sterilization device, and the second water supply pump and the second electric valve are installed on the pipeline connecting the ultrafiltration product water tank and the second ultraviolet sterilization device.

[0016] Furthermore, the security filter is equipped with a filter element with a filtration accuracy of 5μm.

[0017] Furthermore, the reverse osmosis unit includes a reverse osmosis device and a reverse osmosis product water tank;

[0018] The inlet end of the reverse osmosis device is connected to the outlet end of the security filter, and the outlet end of the reverse osmosis device is connected to the inlet end of the reverse osmosis product water tank.

[0019] Furthermore, it also includes a mine wastewater input component, which includes a third water supply pump and a third electric valve;

[0020] The third water supply pump and the third electric valve are located on the pipeline connecting the pretreatment unit to the mine wastewater.

[0021] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0022] This utility model provides a mine wastewater treatment system, comprising a pretreatment unit, a self-cleaning filter, a first ultraviolet sterilization device, an ultrafiltration unit, a second ultraviolet sterilization device, a security filter, and a reverse osmosis unit. The inlet of the pretreatment unit is connected to the mine wastewater, and the inlet of the self-cleaning filter is connected to the outlet of the pretreatment unit. The inlet of the first ultraviolet sterilization device is connected to the outlet of the self-cleaning filter, and the inlet of the ultrafiltration unit is connected to the outlet of the first ultraviolet sterilization device to remove bacteria and viruses from the wastewater. The inlet of the second ultraviolet sterilization device is connected to the outlet of the ultrafiltration unit, and the outlet of the second ultraviolet sterilization device is connected to the inlet of the security filter for further sterilization of bacteria and viruses in the wastewater output from the ultrafiltration unit. The inlet of the reverse osmosis unit is connected to the outlet of the security filter. Compared to traditional mine wastewater treatment systems, this system avoids introducing new chemical agents into the wastewater, thus preventing secondary pollution caused by chemical residues. This helps improve the quality of the treated water, resulting in purer wastewater that is more conducive to subsequent advanced treatment processes such as reverse osmosis. It also eliminates the problem of inaccurate dosing, preventing water quality instability caused by inaccurate dosing. Furthermore, the two-stage ultraviolet disinfection treatment of the wastewater effectively extends the service life and replacement cycle of the ultrafiltration membrane, reverse osmosis membrane, and filter cartridges, reducing labor and maintenance costs and significantly improving economic efficiency. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a mine wastewater treatment system provided in one embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Pretreatment unit; 11. Pretreatment device; 12. Pretreatment product water tank; 13. Pretreatment product water input component; 131. First feed water pump; 132. First electric valve; 2. Self-cleaning filter; 3. First ultraviolet sterilization device; 4. Ultrafiltration unit; 41. Ultrafiltration device; 42. Ultrafiltration product water tank; 43. Ultrafiltration product water input component; 431. Second feed water pump; 432. Second electric valve; 5. Second ultraviolet sterilization device; 6. Security filter; 7. Reverse osmosis unit; 71. Reverse osmosis device; 72. Reverse osmosis product water tank; 8. Mine wastewater input component; 81. Third feed water pump; 82. Third electric valve. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] As attached Figure 1As shown, a mine wastewater treatment system includes a pretreatment unit 1, a self-cleaning filter 2, a first ultraviolet sterilization device 3, an ultrafiltration unit 4, a second ultraviolet sterilization device 5, a security filter 6, and a reverse osmosis unit 7. The inlet of the pretreatment unit 1 is connected to the mine wastewater and is used to remove calcium and magnesium ions from the wastewater. The inlet of the self-cleaning filter 2 is connected to the outlet of the pretreatment unit 1 and is used to perform preliminary filtration of silt, suspended solids, etc., in the mine wastewater to prevent impurities from subsequently clogging pipes or membrane modules in various devices. The inlet of the first ultraviolet sterilization device 3 is connected to the outlet of the self-cleaning filter 2, and the inlet of the ultrafiltration unit 4 is connected to the outlet of the first ultraviolet sterilization device 3. Unit 4 is used to treat the turbidity of mine wastewater. The first ultraviolet sterilization device 3 is used to disinfect bacteria and viruses in the wastewater. The inlet end of the second ultraviolet sterilization device 5 is connected to the outlet end of the ultrafiltration unit 4, and the outlet end of the second ultraviolet sterilization device 5 is connected to the inlet end of the security filter 6. It is used to supplement the sterilization treatment of bacteria and viruses in the wastewater output from the ultrafiltration unit 4. The inlet end of the reverse osmosis unit 7 is connected to the outlet end of the security filter 6. The security filter 6 is used to further finely filter the tiny particles in the wastewater to prevent the tiny particles in the wastewater from entering the reverse osmosis unit 7 and causing scratches, contamination and blockage to the reverse osmosis membrane. The reverse osmosis unit 7 is used to desalinate the mine wastewater and further improve the water quality.

[0031] Specifically, ultraviolet sterilization mainly works by destroying the deoxyribonucleic acid (DNA) or ribonucleic acid (RNA) structure of bacteria and viruses with ultraviolet light, causing them to lose their ability to self-replicate, thereby achieving the purpose of water sterilization, disinfection, and purification. The first ultraviolet sterilization device 3 is set before the ultrafiltration unit 4, which can pre-sterilize the wastewater after passing through the self-cleaning filter 2, reduce the number of bacteria and viruses entering the ultrafiltration unit 4, prevent bacteria and viruses from attaching to the surface of the ultrafiltration membrane in the ultrafiltration unit 4 and multiplying rapidly, thus preventing the ultrafiltration membrane from becoming clogged due to biological accumulation. This ensures the water production flux of the ultrafiltration unit 4, effectively improves the operating efficiency and stability of the ultrafiltration unit 4, and extends the service life of the ultrafiltration membrane. However, although the first ultraviolet sterilization device 3 can remove most bacteria and viruses, a small amount may still remain. Given the extremely fast decomposition rate of bacteria and viruses, if they remain in the ultrafiltration unit 4, they will immediately multiply and amplify. Although the number of amplified bacteria and viruses is far less than the number before sterilization by the first ultraviolet sterilization device 3, and will not clog the ultrafiltration membrane, the wastewater output from the ultrafiltration unit will subsequently pass through the security filter 6 and the reverse osmosis unit 7 for post-treatment. Since the security filter 6 and the reverse osmosis unit 7 themselves do not have the ability to disinfect bacteria and viruses, a second ultraviolet sterilization device 5 is set up to perform secondary sterilization on the wastewater output from the ultrafiltration unit 4. This further ensures that there are no bacteria and viruses in the wastewater entering the security filter 6 and the subsequent reverse osmosis unit 7, effectively extending the service life and replacement cycle of the security filter 6 and the reverse osmosis membrane, reducing the labor and maintenance costs of operation and maintenance, and reducing the online operation frequency of the reverse osmosis membrane. Furthermore, since the first ultraviolet sterilization device 3 and the second ultraviolet sterilization device 5 in this system are physical methods, they do not introduce new chemical agents into the mine wastewater compared with traditional dosing devices. Therefore, they do not cause secondary pollution due to chemical residues in the water, which helps to improve the quality of the produced water and make the treated wastewater purer, which is more conducive to subsequent deep treatment processes such as reverse osmosis. They also avoid the problem of inaccurate dosing and prevent water quality instability caused by inaccurate dosing.

[0032] In some embodiments of this invention, the first ultraviolet sterilization device 3 is a medium-pressure ultraviolet sterilization device. The ultraviolet light band of the medium-pressure ultraviolet sterilization device is 100-400nm. Since different viruses and bacteria have different sensitivities to ultraviolet light wavelengths, a wider spectral range can comprehensively sterilize various viruses and bacteria. Furthermore, the medium-pressure ultraviolet sterilization device has higher power and can generate higher energy output, thus resulting in a stronger sterilization effect and efficient sterilization of bacteria and viruses in mine wastewater within a short time.

[0033] In some embodiments of this invention, the second ultraviolet sterilization device 5 is a medium-pressure ultraviolet sterilization device or a low-pressure ultraviolet sterilization device. Specifically, since the wastewater entering the ultrafiltration unit 4 has already been preliminarily sterilized by the first ultraviolet sterilization device 3, removing all or most of the viruses and bacteria, the second ultraviolet sterilization device 5 installed at the outlet of the ultrafiltration unit 4 is preferably a low-pressure ultraviolet sterilization device with lower power and a smaller sterilization range. It mainly generates ultraviolet light with a wavelength of 254nm to target and disinfect any remaining viruses and bacteria, achieving both secondary sterilization and saving system energy costs, thus improving the economic efficiency of system operation. Of course, when there is a large flow of mine wastewater or severe mine wastewater pollution, the user can choose a medium-pressure ultraviolet sterilization device with stronger sterilization capabilities as the second ultraviolet sterilization device 5. The user's choice of the second ultraviolet sterilization device 5 should be based on the system's operating environment and conditions, and is not limited here.

[0034] In some embodiments of this utility model, the pretreatment unit 1 includes a pretreatment device 11, a pretreatment water production tank 12, and a pretreatment water production input component 13. The pretreatment water production input component 13 includes a first water supply pump 131 and a first electric valve 132. The outlet end of the pretreatment device 11 is connected to the inlet end of the pretreatment water production tank 12, and the outlet end of the pretreatment water production tank 12 is connected to a self-cleaning filter 2. The first water supply pump 131 and the first electric valve 132 are installed on the pipeline connecting the pretreatment water production tank 12 and the self-cleaning filter 2. Mine wastewater enters the pretreatment device 11 to remove calcium and magnesium ions first, and then enters the pretreatment water production tank 12 for later use. When subsequent operations are required, the first electric valve 132 is opened, and the wastewater with removed calcium and magnesium ions is transported to the self-cleaning filter 2 by the first water supply pump 131 for preliminary filtration of silt, suspended solids, etc.

[0035] In some embodiments of this utility model, the ultrafiltration unit 4 includes an ultrafiltration device 41, an ultrafiltration product water tank 42, and an ultrafiltration product water input component 43. The ultrafiltration product water input component 43 includes a second water supply pump 431 and a second electric valve 432. The inlet end of the ultrafiltration device 41 is connected to the outlet end of the first ultraviolet sterilization device 3, and the outlet end of the ultrafiltration device 41 is connected to the inlet end of the ultrafiltration product water tank 42. The outlet end of the ultrafiltration product water tank 42 is connected to the inlet end of the second ultraviolet sterilization device 5. The second water supply pump 431 and the second electric valve 432 are arranged on the pipeline connecting the ultrafiltration product water tank 42 and the second ultraviolet sterilization device 5. After being disinfected by the first ultraviolet sterilization device 3, the wastewater enters the ultrafiltration device 41 for turbidity treatment, and then enters the ultrafiltration product water tank 42 for later use. When subsequent operations are required, the second electric valve 432 is opened, and the wastewater that has undergone turbidity treatment is transported by the second water supply pump 431 to the second ultraviolet sterilization device 5 for secondary disinfection.

[0036] In some embodiments of this utility model, the wastewater that has undergone secondary disinfection by the second ultraviolet sterilization device 5 enters the security filter 6 for secondary filtration, and then enters the reverse osmosis unit 7 from the security filter 6. The security filter 6 is equipped with a filter element with a filtration accuracy of 5μm, which can precisely intercept tiny particles in the wastewater, preventing tiny particles in the wastewater from entering the reverse osmosis unit 7 and causing scratches, contamination and blockage to the reverse osmosis membrane, thereby improving the operational stability of the system and reducing the maintenance cost of the reverse osmosis unit 7.

[0037] In some embodiments of this invention, the reverse osmosis unit 7 includes a reverse osmosis device 71 and a reverse osmosis permeate tank 72; the inlet end of the reverse osmosis device 71 is connected to the outlet end of the security filter 6, and the outlet end of the reverse osmosis device 71 is connected to the inlet end of the reverse osmosis permeate tank 72. Wastewater that has undergone secondary filtration by the security filter 6 enters the reverse osmosis unit 7 for desalination treatment to obtain the final treated permeate, which then enters the reverse osmosis permeate tank 72 for later use.

[0038] In some embodiments of this utility model, the mine wastewater input component 8 includes a third water supply pump 81 and a third electric valve 82; the third water supply pump 81 and the third electric valve 82 are located on the pipeline connecting the pretreatment unit 1 and the mine wastewater. When it is necessary to treat the mine wastewater, the third electric valve 82 is opened, and the wastewater is transported to the pretreatment unit 1 via the third water supply pump 81 for a pretreatment step of removing calcium and magnesium ions.

[0039] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A mine wastewater treatment system, characterized in that, It includes a pretreatment unit, a self-cleaning filter, a first ultraviolet sterilization device, an ultrafiltration unit, a second ultraviolet sterilization device, a security filter, and a reverse osmosis unit; The inlet of the pretreatment unit is connected to the mine wastewater, and the inlet of the self-cleaning filter is connected to the outlet of the pretreatment unit. The inlet end of the first ultraviolet sterilization device is connected to the outlet end of the self-cleaning filter, and the inlet end of the ultrafiltration unit is connected to the outlet end of the first ultraviolet sterilization device to remove bacteria and viruses from the wastewater. The inlet of the second ultraviolet sterilization device is connected to the outlet of the ultrafiltration unit, and the outlet of the second ultraviolet sterilization device is connected to the inlet of the security filter, for the purpose of re-sterilizing the wastewater output by the ultrafiltration unit for bacteria and viruses. The inlet end of the reverse osmosis unit is connected to the outlet end of the security filter.

2. The mine wastewater treatment system as described in claim 1, characterized in that, The first ultraviolet sterilization device is a medium-pressure ultraviolet sterilization device.

3. The mine wastewater treatment system as described in claim 1, characterized in that, The second ultraviolet sterilization device is a medium-pressure ultraviolet sterilization device or a low-pressure ultraviolet sterilization device.

4. The mine wastewater treatment system as described in claim 1, characterized in that, The pretreatment unit includes a pretreatment device, a pretreatment product water tank, and a pretreatment product water input component. The pretreatment product water input component includes a first water supply pump and a first electric valve. The outlet end of the pretreatment device is connected to the inlet end of the pretreatment product water tank, and the outlet end of the pretreatment product water tank is connected to the self-cleaning filter. The first water supply pump and the first electric valve are installed on the pipeline connecting the pretreatment product water tank and the self-cleaning filter.

5. The mine wastewater treatment system as described in claim 1, characterized in that, The ultrafiltration unit includes an ultrafiltration device, an ultrafiltration product water tank, and an ultrafiltration product water input component. The ultrafiltration product water input component includes a second water supply pump and a second electric valve. The inlet end of the ultrafiltration device is connected to the outlet end of the first ultraviolet sterilization device, the outlet end of the ultrafiltration device is connected to the inlet end of the ultrafiltration product water tank, the outlet end of the ultrafiltration product water tank is connected to the inlet end of the second ultraviolet sterilization device, and the second water supply pump and the second electric valve are installed on the pipeline connecting the ultrafiltration product water tank and the second ultraviolet sterilization device.

6. The mine wastewater treatment system as described in claim 1, characterized in that, The security filter is equipped with a filter element with a filtration accuracy of 5μm.

7. The mine wastewater treatment system as described in claim 1, characterized in that, The reverse osmosis unit includes a reverse osmosis device and a reverse osmosis product water tank; The inlet end of the reverse osmosis device is connected to the outlet end of the security filter, and the outlet end of the reverse osmosis device is connected to the inlet end of the reverse osmosis product water tank.

8. The mine wastewater treatment system as described in claim 1, characterized in that, It also includes a mine wastewater input component, which includes a third water supply pump and a third electric valve; The third water supply pump and the third electric valve are located on the pipeline connecting the pretreatment unit to the mine wastewater.

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