Mine water recycling system

Abstract

The utility model belongs to an advanced sewage treatment system, and particularly relates to a mine water recycling system which comprises a water collecting tank, an adjusting device, a circulating clarification device, a medium filtering device and a sterilizing device which are sequentially communicated with the water collecting tank through pipelines, and a sludge treatment device for treating sludge generated by the circulating clarification device, the sludge treatment device is communicated with a sludge discharge pipe of the circulating clarification device, the adjusting device comprises a water quantity adjusting area, a pre-precipitation area and a suspension maintaining area, and an aeration structure is arranged in the suspension maintaining area. According to the utility model, the arrangement of the treatment system is optimized, and the specific structures of the adjusting device, the circulating clarification device and the like are optimized and improved, so that the treatment efficiency and the treatment effect of the system on mine water are greatly improved.

Description

Technical Field

[0001] The utility model belongs to the field of advanced sewage treatment systems, and particularly relates to a mine water reuse system. Background Art

[0002] Mine water refers to the surface infiltration water and groundwater layer water generated during mine exploitation, which is contaminated by sand and mud particles, dust, dissolved salts, acids and alkalis, coal particles, grease, etc. The water quality characteristics are mainly determined by the underlying characteristics of the coal mine and the mining method. Therefore, the water quality is extremely unstable, with high hardness, salinity, iron and manganese content, and may also carry a large amount of inorganic suspended solids. However, its COD, microbial and total dissolved solid content are generally low, and the output is often large. Treating and comprehensively utilizing mine water can not only avoid polluting the water environment, but also prevent water resource waste. The treated water can be reused for mine production, greening, dust prevention, etc., and can also be used as industrial makeup water for enterprises around the mine, irrigation water for farmland around the mine, etc. After advanced treatment, it can even be used as a water source for residential living.

[0003] Currently, for the treatment of mine water, for example, a treatment system and method for mine drainage water disclosed in CN109052729A, the treatment system includes: a membrane chemical reactor and a reverse osmosis device; wherein, the reverse osmosis device includes: a raw water reverse osmosis device and a concentrated water reverse osmosis device; the water outlet end of the membrane chemical reactor is connected to the water inlet end of the raw water reverse osmosis device, and the concentrated water outlet end of the raw water reverse osmosis device is connected to the water inlet end of the concentrated water reverse osmosis device; the mine drainage water is pretreated by the membrane chemical reactor for full-scale filtration, improving the reuse rate of mine water, and at the same time, the produced water quality is stable, meeting the inlet requirements of the subsequent reverse osmosis process. Another example is a zero-discharge treatment system for drainage water disclosed in CN214400101U, which includes a first clarification device, a second clarification device, a multi-media filtration device, a first ultrafiltration device, a cation exchange device, a SWRO reverse osmosis device, an electrodialysis device, an advanced oxidation reaction device, a second ultrafiltration device, a BWRO reverse osmosis device and an evaporation device connected in sequence through pipelines. The drainage water is pretreated by the first clarification device, the second clarification device, the multi-media filtration device, the first ultrafiltration device and the cation exchange device. The pretreated water undergoes desalination and concentration through the SWRO reverse osmosis device, and the concentrated water is further concentrated through the electrodialysis device. The obtained concentrated water sequentially passes through the advanced oxidation reaction device, the second ultrafiltration device and the BWRO reverse osmosis device, and the obtained fresh water can be directly reused for fresh water, and the concentrated water is concentrated and crystallized in the evaporation device to obtain inorganic salts.

[0004] In the existing treatment systems, most directly filter the mine water and treat it through a membrane system. Such treatment has low efficiency, and the water production of mine water is particularly large, imposing a great pressure on the treatment system. Summary of the Invention

[0005] The object of the present utility model is to provide a mine water recycling system, which can treat mine water to meet the discharge or recycling standards, with a large daily treatment capacity, stable operation of equipment, and high water output efficiency.

[0006] The present utility model adopts the following technical solutions:

[0007] A mine water recycling system includes a collecting tank, an adjusting device, a circulating clarifying device, a media filtration device, a sterilizing device, which are connected to the collecting tank in sequence through pipelines, and a sludge treatment device for disposing of the sludge generated by the circulating clarifying device. The sludge treatment device is connected to the sludge discharge pipe of the circulating clarifying device. The adjusting device includes a water volume adjusting area, a pre-sedimentation area, and a suspension maintaining area, and an aeration structure is arranged in the suspension maintaining area.

[0008] Mine water is discharged from the mine and flows into the collecting tank, and then is diverted from the collecting tank to the mine water adjusting device, and then lifted into the hydraulic circulating clarifying device. During the lifting process, a coagulant and a coagulant aid are added. After reaction and precipitation in the clarifying device and separation of mud and water, the supernatant flows into the filtration tank, and the further filtered water flows into the clear water tank for reuse. The recycled water is further pressurized by a recycled water booster pump, disinfected and sterilized by the sterilizing device, and then filtered by a final security filter and sent to the water use point.

[0009] In the above technical solution, the layout of the treatment system is optimized, and an adjusting device, a circulating clarifying device, a media filtration device, a sterilizing device, and a sludge treatment device are provided. In particular, an adjusting device is provided. The quality and quantity of the underground drainage in the mine are both relatively stable and have certain fluctuations. In actual operation, it is often found that the content of suspended solids in the underground drainage fluctuates abnormally in a short time, and the content of suspended solids can instantaneously reach several times or even dozens of times the average value. Directly entering the flocculation device is not conducive to the stability of the system and the treatment of mine water. In order to buffer and balance the water quality and ensure the safe and stable operation of the treatment station, it is very necessary to set an adjusting device at the front stage of the water treatment process. In addition, the underground water inflow is generally discharged to the ground through the underground drainage system, and the working conditions of the underground drainage system and the underground drainage station often do not match. By setting the adjusting device, not only can the different working conditions of the underground drainage system and the underground drainage station be coordinated, but also the water treatment equipment capacity can be optimized through the adjustment of the tank volume to make it more reasonable.

[0010] In the above technical solution, the adjusting device is provided with a water volume adjusting area, a pre-sedimentation area and a suspended matter maintaining area. The water volume adjusting area mainly balances the relationship between the mine water production volume and the treatment volume, ensuring the stability of the mine water entering the system. Considering the uncertainty and large fluctuations of the suspended matter in the mine water, the adjusting device also needs to have the ability to remove a certain amount of suspended matter or prevent the suspended matter in the pool from settling by stirring so as to enter the subsequent treatment facilities. In the above solution of the present utility model, a pre-sedimentation area and a suspended matter maintaining area are arranged after the water volume adjusting area. The pre-sedimentation area pre-sediments the mine water to remove large particulate matter. The suspended matter maintaining area ensures that the suspended matter in the water remains in a suspended state before the mine water enters the subsequent circulating clarifying device, facilitating entry into the subsequent treatment. Reasonably setting the adjusting device according to the functional partition can not only ensure the safe, stable and flexible operation of the treatment system, but also optimize the water treatment equipment capacity and reduce the project investment.

[0011] The suspended state of the suspended matter is achieved through the aeration structure, which has less maintenance and lower initial investment compared with mechanical stirring and is easier to implement.

[0012] The sludge discharged from the circulating clarifying tank is pumped or flows into the sludge thickening tank, and the sludge is dried and dehydrated by a belt filter press, and the cake is transported out of the plant.

[0013] Preferably, the aeration structure in the suspended matter maintaining area includes a bottom aeration structure located at the bottom and a side aeration structure located on the side. The aeration structure maintains the suspended state of the suspended matter in the water on the one hand and improves the distribution uniformity of the suspended matter in the water on the other hand, which is beneficial to the efficient progress of the subsequent flocculation treatment.

[0014] Preferably, the suspended matter maintaining area is communicated with the circulating clarifying device through a water injector. The mine water in the suspended matter maintaining area passes through the nozzle of the water injector, and a negative pressure is formed around it to suck in the sludge. This enables the raw water, sludge and coagulant to be fully and vigorously mixed quickly, thereby increasing the collision between the suspended particles and accelerating the contact flocculation effect to achieve the purpose of sludge-water separation.

[0015] Preferably, the circulating clarifying device includes a first flocculation chamber, a second flocculation chamber and a separation chamber that are connected in sequence. Among them, both the first flocculation chamber and the second flocculation chamber are provided with flocculant dosing structures, and the accommodation volume of the second flocculation chamber is larger than that of the first flocculation chamber. The mine water passing through the adjusting device is lifted by a pump to the high-efficiency clarifying treatment device for treatment. The circulating clarifying device is a sludge-circulating type clarifying tank that integrates mixing, flocculation and sedimentation. The occurrence of flocculation mainly occurs in the first flocculation chamber. The role of the second flocculation chamber is to further promote the occurrence of flocculation and at the same time further enlarge the already flocculated flocs, which is beneficial to the subsequent sedimentation separation.

[0016] Preferably, a particulate matter feeding structure is provided in the second flocculation chamber. By feeding a small amount of particulate matter, such as activated carbon particles, into the second flocculation chamber, attachments can be provided for the flocs, which is beneficial to further growth of the floccules.

[0017] Preferably, a reflux pipeline is provided between the second flocculation chamber and the first flocculation chamber.

[0018] Preferably, the medium filtration device includes a device body and a filtration medium layer disposed in the inner cavity of the device body. The filtration medium layer includes a pebble support layer at the bottom, a coarse sand layer above the pebble support layer, a bituminous coal layer above the coarse sand layer, and a fine sand layer above the bituminous coal layer. Through the filtration of the medium filtration device, not only the turbidity of water is further reduced, but also organic matters, some bacteria, etc. in the water will be removed as the turbidity of the water decreases.

[0019] Preferably, the sludge treatment device includes a sludge dewatering machine, and the sludge dewatering machine is connected to the sludge discharge pipe of the circulating clarification device and the sludge discharge pipe of the pre-sedimentation tank through a sludge pump.

[0020] Preferably, the filtrate pipeline of the sludge dewatering machine is connected to the suspension maintenance area of the regulating device.

[0021] Preferably, a bag filter device is further provided after the sterilization device.

[0022] By implementing the above technical solutions, the utility model has the following beneficial effects:

[0023] By optimizing the layout of the treatment system and simultaneously optimizing and improving the specific structures of the regulating device, the circulating clarification device, etc., the treatment efficiency and treatment effect of the system on mine water are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following will describe in detail the preferred embodiments of the present invention with the help of the drawings to facilitate understanding of the technical solutions of the present invention, where:

[0025] Figure 1 is a schematic flow chart of a mine water reuse system shown in an embodiment of the present invention;

[0026] Figure 2 is a schematic plan structure diagram of a mine water reuse system in another embodiment of the present invention.

[0027] In the figure, 10 - sump, 20 - regulating device, 201 - water volume regulating area, 202 - pre - precipitation area, 203 - maintaining suspension area, 40 - circulating clarifying device, 50 - flocculant dosing structure, 60 - media filtration device, 61 - backwashing structure, 70 - sterilization device, 80 - bag - type filtration device, 90 - sludge treatment device. Detailed implementation mode

[0028] The technical solution of the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific implementation cases.

[0029] It should be noted that the following implementation cases are only used to illustrate the technical solution of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the following implementation cases, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in each implementation case, or perform equivalent replacement on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of each implementation case of the present utility model. Embodiment

[0030] A mine water reuse system, see Figure 1 , including a sump 10 and a regulating device 20, a circulating clarifying device 40, a media filtration device 60, a sterilization device 70, a bag - type filtration device 80, and a sludge treatment device 90 that are sequentially connected to the sump 10 through pipelines. The sump 10 is used to receive and collect mine water from different areas of the mine. The mine water passes through the regulating device 20, the circulating clarifying device 40, the media filtration device 60, the sterilization device 70, and the bag - type filtration device 80 in sequence and is finally reused. After being treated by the system of this embodiment, the requirements for industrial water, agricultural irrigation water, fire - fighting water, ecological water, etc. are met. If it is necessary to further improve the water quality to meet the requirements of drinking water, on the basis of the treatment by the bag - type filtration device 80, further treatment such as reverse osmosis can be carried out. The sludge treatment device 90 is connected to the sludge discharge pipe of the circulating clarifying device 40 to dispose of the sludge generated by the circulating clarifying device 40.

[0031] See Figure 2 , the regulating device 20 includes a water volume regulating area 201, a pre - precipitation area 202, and a maintaining suspension area 203 that are sequentially connected. An aeration structure is arranged in the maintaining suspension area 203, including a bottom aeration structure at the bottom and a side aeration structure on the side. The aeration structure adopts the aeration structure in the prior art. Both the bottom aeration structure and the side aeration structure include an air - outlet pipe with an air - outlet, and compressed air is introduced to achieve aeration, which is not shown in the figure. The water volume regulating area 201 is connected to the sump 10.

[0032] The adjustment device 20 keeps the suspension area 203 in communication with the circulation clarification device 40. In this embodiment, a water injector is preferably used for communication to enable sufficient and intense rapid mixing of raw water, sludge, and coagulant.

[0033] The circulation clarification device 40 includes a first flocculation chamber 401, a second flocculation chamber 402, and a separation chamber 403 that are connected in sequence. The circulation clarification device 40 is a sludge circulation type clarifying tank that integrates mixing, flocculation, and sedimentation. The occurrence of flocculation mainly occurs in the first flocculation chamber 401. The function of the second flocculation chamber 402 is to further promote the occurrence of flocculation and further enlarge the already flocculated flocs, which is beneficial for subsequent sedimentation separation. Among them, both the first flocculation chamber 401 and the second flocculation chamber 402 are provided with flocculant dosing structures 50 to quantitatively dose flocculant according to a set value. The accommodation volume of the second flocculation chamber 402 is larger than that of the first flocculation chamber 401, which can extend the residence time of mine water in the second flocculation chamber 402 and is beneficial for the formation of large particle flocs.

[0034] In another specific embodiment, a particulate matter dosing structure is provided in the second flocculation chamber 402. By introducing a small amount of particulate matter, such as activated carbon particles, into the second flocculation chamber 402, an attachment for the flocs can be provided, which is beneficial for further enlargement of the flocs.

[0035] In another specific embodiment, a return pipeline is provided between the second flocculation chamber 402 and the first flocculation chamber 401. A part of the mine water in the second flocculation chamber 402 is returned to the first flocculation chamber 401. Since the flocculation particles in the second flocculation chamber 402 are larger, when they are returned to the first flocculation chamber 401, they serve as flocculation attachment bodies, which is beneficial for the formation of flocs in the first flocculation chamber 401.

[0036] The mine water that has completed flocculation in the second flocculation chamber 402 in the circulation clarification device 40 enters the separation chamber 403 for separation. The separated liquid enters the subsequent treatment device, while the sludge with a part of the liquid enters the sludge dewatering machine through a sludge pump. After dehydration, the filtrate is sent to the circulation suspension pool area of the adjustment device 20 for further treatment, and the sludge is transported out for landfill or other subsequent treatment.

[0037] After the circulating clarification device 40 is a medium filtration device 60. The mine water that has passed through the separation chamber 403 of the circulating clarification device 40 enters the medium filtration device 60. The medium filtration device 60 further deeply removes the suspended substances in the flocculated mine water after coagulation treatment through multi-media filtration. The medium filtration device 60 of this embodiment includes a device body and a filtration medium layer built in the inner cavity of the device body. The filtration medium layer includes a pebble support layer (50 cm thick) at the bottom, a coarse sand layer (30 cm thick) above the pebble support layer, a bituminous coal layer (30 cm thick) above the coarse sand layer, and a fine sand layer (20 cm thick) above the bituminous coal layer.

[0038] The medium filtration device 60 is configured with a backwashing structure 61, which adopts a combination of air and water washing methods, including a backwashing water pipeline and a backwashing gas pipeline, arranged below the pebble support layer of the filtration medium layer, and backwashing from bottom to top.

[0039] In another specific embodiment, it further includes a forward washing structure, which is the same as the backwashing structure, except for the arrangement position. It is arranged above the fine sand layer of the filtration medium layer and performs forward washing from top to bottom, cooperating with the backwashing structure to achieve a better washing effect.

[0040] After the medium filtration device 60 is a sterilization device 70. In this embodiment, an ultraviolet sterilizer is used. The mine water after passing through the medium filtration device 60 is pumped into the ultraviolet sterilizer by a booster pump.

[0041] The sterilized mine water enters a bag filter for further filtration, and the recycled effluent is obtained after filtration.

[0042] After on-site testing, for the above mine water recycling system, the treatment capacity of mine drainage and gangue water can reach 1500 m 3 / d.

Claims

1. A mine water reuse system, characterized in that, It includes a collecting tank, an adjusting device, a circulating clarification device, a media filtration device, a sterilization device that are sequentially connected to the collecting tank through pipelines, and a sludge treatment device for disposing of the sludge generated by the circulating clarification device. The sludge treatment device is connected to the sludge discharge pipe of the circulating clarification device. The adjusting device includes a water volume adjustment area, a pre-sedimentation area, and a suspension maintenance area, and an aeration structure is arranged in the suspension maintenance area.

2. The mine water reuse system according to claim 1, characterized in that, The aeration structure in the suspension maintenance area includes a bottom aeration structure located at the bottom and a side aeration structure located on the side.

3. A mine water reuse system according to claim 1, characterized in that, The suspension maintenance area is connected to the circulating clarification device through a water injector.

4. A mine water reuse system according to claim 1, characterized in that, The circulating clarification device includes a first flocculation chamber, a second flocculation chamber, and a separation chamber that are sequentially connected. Among them, flocculant feeding structures are provided in both the first flocculation chamber and the second flocculation chamber, and the accommodation volume of the second flocculation chamber is larger than that of the first flocculation chamber.

5. The mine water reuse system according to claim 4, characterized in that, A particulate matter feeding structure is arranged in the second flocculation chamber.

6. The mine water reuse system according to claim 4, wherein, A reflux pipeline is arranged between the second flocculation chamber and the first flocculation chamber.

7. A mine water reuse system according to claim 1, characterized in that, The sludge treatment device includes a sludge dehydrator, and the sludge dehydrator is connected to the sludge discharge pipe of the circulating clarification device and the sludge discharge pipe of the pre-sedimentation tank through a sludge pump.

8. A mine water reuse system according to claim 7, characterized in that, The filtrate pipeline of the sludge dehydrator is connected to the suspension maintenance area of the adjusting device.

9. The mine water reuse system according to claim 1, characterized in that, A bag filter device is further arranged after the sterilization device.

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