Mine acidic underground water collecting and pretreating structure

Abstract

The utility model discloses a mine acid underground water collecting and preprocessing structure which comprises a guide and drainage blind ditch, an acid underground water collecting and preprocessing area and a vertical anti-seepage curtain which are sequentially arranged in the water flow direction. The guide and drainage blind ditch is used for being buried in slag and communicated with the acidic underground water collection and pretreatment area; the acidic underground water collection and pretreatment area is filled with a reaction filler, and the reaction filler is used for collecting acidic underground water and adjusting the pH value of the acidic underground water; the vertical anti-seepage curtain is used for being embedded into impermeable bed rocks on the two sides and at the bottom, and the vertical anti-seepage curtain is used for intercepting the acid underground water in the acid underground water collecting and preprocessing area, and the guide and drainage blind ditch, the acid underground water collecting and preprocessing area and the vertical anti-seepage curtain are used in cooperation; and overflowing mine acid underground water can be completely collected, excessive pumping of the underground water is not needed, and ground subsidence and collapse of surrounding buildings and structures are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of mine acid groundwater treatment, and particularly relates to a mine acid groundwater collection and pretreatment structure. Background Art

[0002] With the rapid development of society, extensive mine exploitation can no longer meet the social demand for environmental protection. More and more mines have gradually withdrawn from the historical stage due to non-compliance with environmental protection requirements, leaving a large number of abandoned mine slag, which continuously increases the regional environmental pollution pressure and causes serious pollution to the regional water and soil environment. The mine slag, waste rock, and waste residue left over from mining and smelting are stacked disorderly and exposed in the mining area. Most of the abandoned mining areas are located in mountainous areas, and the mine slag and waste rock are stacked disorderly in valleys and slopes. After years of soaking, the heavy metals, sulfur, and other pollution factors inside gradually release into the water body under the action of bacteria, and the formed acidic wastewater seriously damages the regional water environment, which will affect the safety of local drinking water and domestic and industrial production water, and may seriously affect the physical health of residents to a certain extent.

[0003] Patent CN116239205A discloses a method for repairing polluted groundwater in an in-situ leaching uranium mine. The method includes: pumping water from all pumping wells in the final mining area of the in-situ leaching uranium mine, and detecting the pumped groundwater to determine whether the pumped groundwater meets the preset standard; when the pumped groundwater does not meet the preset standard, decontaminating the groundwater and re-injecting the decontaminated groundwater into each injection well; jumping to "pumping water from all pumping wells in the final mining area of the in-situ leaching uranium mine" and continuing to execute the subsequent steps until the currently pumped groundwater meets the preset standard, and then re-injecting the pumped groundwater into each injection well; injecting a reducing agent into each injection well, and regularly detecting the increase in the concentration of characteristic indicators in the groundwater until the increase in the concentration of characteristic indicators reaches the preset value, and completing the groundwater repair operation.

[0004] The above-mentioned existing technology realizes groundwater collection through pumping wells, but it is difficult for groundwater pumping and drainage wells to collect all the flowing mine acid groundwater, and excessive pumping of groundwater may cause ground settlement and collapse of surrounding buildings and structures. Using pumping wells to collect groundwater cannot achieve the purpose of fully quantifying the repair of groundwater. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the above technical deficiencies, and propose a mine acid groundwater collection and pretreatment structure to solve the technical problems in the existing technology that groundwater collection is realized through pumping wells, but it is difficult for groundwater pumping and drainage wells to collect all the flowing mine acid groundwater, and excessive pumping of groundwater may cause ground settlement and collapse of surrounding buildings and structures, and using pumping wells to collect groundwater cannot fully quantify the repair of groundwater.

[0006] To achieve the above technical objectives, the present utility model adopts the following technical solutions:

[0007] The present utility model provides a structure for collecting and pre-treating acidic groundwater in mines, which is arranged at the downstream position of the acidic groundwater pollution area in the mine, and includes a drainage blind ditch, an acidic groundwater collection and pre-treatment area, and a vertical impervious curtain arranged in sequence along the water flow direction;

[0008] The drainage blind ditch is used to be buried in the slag and communicate with the acidic groundwater collection and pre-treatment area;

[0009] The acidic groundwater collection and pre-treatment area is filled with reaction fillers, and the reaction fillers are used to collect acidic groundwater and adjust the pH of the acidic groundwater;

[0010] The vertical impervious curtain is used to be embedded in the impervious bedrock on both sides and at the bottom, and the vertical impervious curtain is used to intercept the acidic groundwater in the acidic groundwater collection and pre-treatment area.

[0011] In some embodiments, the drainage blind ditch includes a water infiltration pipe and a filter cloth arranged at intervals from the inside to the outside. The circumferential surface of the water infiltration pipe is provided with water infiltration holes, and filter fillers are arranged between the filter cloth and the water infiltration pipe.

[0012] In some embodiments, the diameter of the water infiltration holes is 8 mm, and the hole opening rate of the water infiltration pipe is greater than or equal to 2%;

[0013] The filter fillers are graded crushed stones with a particle size of 20 - 60 mm;

[0014] The filter cloth is 200 g / m 2 filament non-woven geotextile.

[0015] In some embodiments, the structure for collecting and pre-treating acidic groundwater in mines further includes a water distribution pipe and a water outlet pipe. The water distribution pipe is buried in the reaction fillers, the water distribution pipe communicates with the drainage blind ditch, some of the circumferential surfaces of the water distribution pipe are provided with openings, one end of the water outlet pipe is buried in the reaction fillers, the other end of the water outlet pipe passes through the vertical impervious curtain for connecting with a water treatment device, and some of the circumferential surfaces of the part of the water outlet pipe located in the reaction fillers are provided with openings.

[0016] In some embodiments, the water distribution pipe includes a main pipe and a plurality of branch pipes. The main pipe communicates with the drainage blind ditch, the plurality of branch pipes are arranged at intervals along a first direction, one end of each branch pipe communicates with the main pipe, the circumferential surface of the branch pipe is provided with openings, and the first direction is perpendicular to the water flow direction.

[0017] In some embodiments, the branch pipes are bent downward and located at the bottom of the reaction fillers.

[0018] In some embodiments, a plurality of the water outlet pipes are provided, and the plurality of water outlet pipes and the plurality of branch pipes are alternately arranged in a first direction.

[0019] In some embodiments, the reaction filler includes a first reaction filler and a second reaction filler arranged in sequence from inside to outside, the particle size of the first reaction filler is larger than that of the second reaction filler, the water distribution pipe is located in the second reaction filler, and the water outlet pipe is located in the first reaction filler.

[0020] In some embodiments, the mine acidic groundwater collection and pretreatment structure further includes a groundwater sampling well, the groundwater sampling well is located in the acidic groundwater collection and pretreatment area, the lower end of the groundwater sampling well is communicated with the water outlet pipe, and the upper end of the groundwater sampling well extends out of the reaction filler.

[0021] In some embodiments, a plain concrete layer is further provided on the top of the acidic groundwater collection and pretreatment area.

[0022] Compared with the prior art, for the mine acidic groundwater collection and pretreatment structure provided by the present utility model, the drainage blind ditch is used to be buried in the slag and communicated with the acidic groundwater collection and pretreatment area; the acidic groundwater collection and pretreatment area is filled with reaction filler, and the reaction filler is used to collect acidic groundwater and adjust the pH of the acidic groundwater; the vertical impervious curtain is used to be embedded in the impervious bedrock on both sides and at the bottom, and the vertical impervious curtain is used to intercept the acidic groundwater in the acidic groundwater collection and pretreatment area. Specifically, when in use, the acidic groundwater in the slag in the fissure flows through the slag and enters the reaction filler; and the acidic groundwater in the slag in a stream is collected through the drainage blind ditch and enters the reaction filler. The reaction filler can react with the acidic groundwater to adjust its pH value. The bottom and both sides of the vertical impervious curtain are embedded in the impervious bedrock, so that the acidic groundwater in the slag can stay in the reaction filler, making it fully contact with the reaction filler for pretreatment, and at the same time, it can intercept the downward seepage of the acidic groundwater. Through the combined use of the drainage blind ditch, the acidic groundwater collection and pretreatment area and the vertical impervious curtain, all the flowing mine acidic groundwater can be collected, without excessive pumping of groundwater, avoiding ground settlement and collapse of surrounding buildings and structures.

[0023] This application can collect all the mine acidic groundwater flowing through the cross-section and organize it to be discharged to the subsequent water treatment equipment.

[0024] In this application, both the mine acidic groundwater in a stream and the mine acidic groundwater in the fissure can be evenly distributed in the reaction filler and fully react with the reaction filler.

[0025] This application can regularly monitor the water quality indicators of acidic groundwater in the acidic groundwater collection and pretreatment area, guiding subsequent engineering design and optimization of process parameters.

[0026] The above description is only an overview of the technical solution of the present utility model. In order to be able to more clearly understand the technical means of the present utility model and can be implemented in accordance with the content of the description, the preferred embodiments of the present utility model are described in detail below in conjunction with the accompanying drawings. The specific implementation manners of the present utility model are given in detail by the following embodiments and their accompanying drawings. Brief Description of the Drawings

[0027] Figure 1 is a schematic plan view of an embodiment of the structure for collecting and preprocessing acidic groundwater in a mine provided by the present utility model;

[0028] Figure 2 is Figure 1 a longitudinal sectional view of the drainage blind ditch and the water distribution pipe part in

[0029] Figure 3 is Figure 1 a longitudinal sectional view of the water outlet pipe part in

[0030] Description of the Reference Numerals:

[0031] 1 - drainage blind ditch, 11 - seepage pipe, 12 - filter cloth, 13 - filter filler, 2 - acidic groundwater collection and pretreatment area, 21 - reaction filler, 211 - first reaction filler, 212 - second reaction filler, 22 - water distribution pipe, 221 - main pipe, 222 - branch pipe, 23 - water outlet pipe, 3 - vertical impervious curtain, 4 - groundwater sampling well, 5 - plain concrete layer, 200 - slag, 300 - impervious bedrock. Detailed Description of the Preferred Embodiments

[0032] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0033] In order to solve the technical problem in the prior art that groundwater collection is achieved through pumping wells, but it is difficult for groundwater pumping wells to collect all the flowing acidic groundwater in mines, and excessive pumping of groundwater may cause ground settlement and collapse of surrounding buildings and structures, and it is impossible to fully repair groundwater by using pumping wells to collect groundwater, the present utility model provides a structure for collecting and preprocessing acidic groundwater in mines, which can collect all the flowing acidic groundwater in mines without excessive pumping of groundwater, avoiding ground settlement and collapse of surrounding buildings and structures.

[0034] Please refer to Figure 1 ,Figure 1 This is a schematic structural diagram of the collection and pretreatment structure for acidic groundwater in a mine in an embodiment of the present utility model.

[0035] The present utility model provides a collection and pretreatment structure for acidic groundwater in a mine, which is arranged at the downstream position of the acidic groundwater pollution area in the mine and includes a drainage blind ditch 1, an acidic groundwater collection and pretreatment area 2, and a vertical impervious curtain 3 arranged in sequence along the water flow direction; the drainage blind ditch 1 is used to be buried in the slag 200 and communicate with the acidic groundwater collection and pretreatment area 2; the acidic groundwater collection and pretreatment area 2 is filled with reaction fillers 21, and the reaction fillers 21 are used to collect acidic groundwater and adjust the pH of the acidic groundwater; the vertical impervious curtain 3 is used to be embedded in the impervious bedrock 300 on both sides and at the bottom, and the vertical impervious curtain 3 is used to intercept the acidic groundwater in the acidic groundwater collection and pretreatment area 2.

[0036] In this embodiment, the drainage blind ditch 1 is used to be buried in the slag 200 and communicate with the acidic groundwater collection and pretreatment area 2; the acidic groundwater collection and pretreatment area 2 is filled with reaction fillers 21, and the reaction fillers 21 are used to collect acidic groundwater and adjust the pH of the acidic groundwater; the vertical impervious curtain 3 is used to be embedded in the impervious bedrock 300 on both sides and at the bottom, and the vertical impervious curtain 3 is used to intercept the acidic groundwater in the acidic groundwater collection and pretreatment area 2. Specifically, when in use, the acidic groundwater in the slag 200 in the fissure flows through the slag 200 and enters the reaction fillers 21; and the acidic groundwater in the form of a stream is collected by the drainage blind ditch 1 and enters the reaction fillers 21. The reaction fillers 21 can react with the acidic groundwater to adjust its pH value. The bottom and both sides of the vertical impervious curtain 3 are embedded in the impervious bedrock 300, which can keep the acidic groundwater in the slag 200 in the reaction fillers 21, making it fully contact with the reaction fillers 21 for pretreatment, and at the same time can intercept the acidic groundwater from infiltrating downstream. Through the combined use of the drainage blind ditch 1, the acidic groundwater collection and pretreatment area 2, and the vertical impervious curtain 3, all the flowing acidic groundwater in the mine can be collected, without excessive pumping of groundwater, avoiding ground settlement and the collapse of surrounding buildings and structures.

[0037] It should be noted that the mine acid groundwater collection and pretreatment structure is located downstream of the mine acid groundwater pollution area. The two sides and the bottom of this downstream position are impermeable bedrock 300. Between the two sides of the impermeable bedrock 300, there are slag 200 piled up. Specifically, during the setting, a location can be selected downstream of the mine acid groundwater pollution area, and the mine acid groundwater collection and pretreatment structure can be placed underground, with its top elevation being consistent with the original terrain. Looking from the plane, the drain blind ditch 1 is located at the front end, the mine acid groundwater collection and pretreatment area 2 is located in the middle, and its bottom depth is flush with the surface of the impermeable bedrock 300. The vertical impervious curtain 3 is located at the end, and the depth of its bottom and both sides embedded into the surface of the impermeable bedrock 300 is not less than 1.0 m.

[0038] In this embodiment, the front side of the reaction filler 21 in the mine acid groundwater collection and pretreatment area 2 abuts against the piled-up slag 200, so that the acid groundwater in the cracks of the slag 200 can flow through the slag 200 and enter the reaction filler 21. In order to prevent the slag 200 from entering the mine acid groundwater collection and pretreatment area 2, a 200 g / m 2 long filament non-woven geotextile is also provided between the slag 200 and the reaction filler 21. This geotextile can play a good filtering role and can effectively prevent the slag 200 from entering the reaction filler 21.

[0039] In one of the embodiments, please refer to Figure 2 , the drain blind ditch 1 includes a water infiltration pipe 11 and a filter cloth 12 that are arranged at intervals from the inside to the outside. The circumference of the water infiltration pipe 11 is provided with water infiltration holes, and a filter filler 13 is provided between the filter cloth 12 and the water infiltration pipe 11.

[0040] In one of the embodiments, the diameter of the water infiltration holes is 8 mm, and the hole opening rate of the water infiltration pipe 11 is greater than or equal to 2%; the filter filler 13 is graded gravel with a particle size of 20 - 60 mm; the filter cloth 12 is 200 g / m 2 long filament non-woven geotextile.

[0041] In this embodiment, the drain blind ditch 1 is arranged at the position of the groundwater seepage dominant channel to collect one or more large-flow groundwater in the formation into the acid groundwater collection and pretreatment area 2 in an organized manner. And the cross-section of the drain blind ditch 1 is trapezoidal, with a depth of 0.5 m, a bottom width of 0.4 m, and a top width of 1.4 m. The outside of the drain blind ditch 1 is wrapped with 200 g / m 2 long filament non-woven geotextile for reverse filtration, filled with graded gravel with a particle size of 20 - 60 mm, and the particle size is set as fine at the top and coarse at the bottom. The water infiltration pipe 11 is laid in the drain blind ditch 1. The water infiltration pipe 11 is a dn200 HDPE perforated pipe, and its perforation diameter is 8 mm, and the hole opening rate ≥ 2%. And the outside of the water infiltration pipe 11 is also wrapped with 200 g / m2 The filtration of the long-fiber non-woven geotextile, and the drainage blind ditch 1 finally connects to the water distribution pipe 22 in the acidic groundwater collection and pretreatment area 2.

[0042] In this embodiment, the reaction filler 21 can react with the acidic groundwater to adjust the pH of the acidic groundwater and initially reduce the concentration of metal ions in the acidic groundwater. The reaction filler 21 is an alkaline mixture. Here, a homogeneous mixture of limestone and quartz sand with a mass ratio of 1:1 is used, and the particle size of the reaction filler 21 is 30 mm to 50 mm.

[0043] In one of the embodiments, please refer to Figures 1 to 3 , the mine acidic groundwater collection and pretreatment structure further includes a water distribution pipe 22 and a water outlet pipe 23. The water distribution pipe 22 is buried in the reaction filler 21, and the water distribution pipe 22 is communicated with the drainage blind ditch 1. Openings are provided on the circumference of a part of the water distribution pipe 22. One end of the water outlet pipe 23 is buried in the reaction filler 21, and the other end of the water outlet pipe 23 passes through the vertical impervious curtain 3 for connecting with a water treatment device. Openings are provided on the circumference of a part of the water outlet pipe 23 located in the reaction filler 21.

[0044] In this embodiment, the water distribution pipe 22 can evenly flow the gushing mine acidic groundwater into the acidic groundwater collection and pretreatment area 2 and fully react with the reaction filler 21 in this area to achieve a good pretreatment effect. The water outlet pipe 23 can organize the discharge of the mine acidic groundwater after collection and pretreatment to the downstream water treatment device.

[0045] In this embodiment, the water outlet pipe 23 is arranged at a position 1.5 m from the ground. The length of the water outlet pipe 23 located in the reaction filler 21 is 2 m, and a flexible waterproof sleeve is provided on the outer circumference of the part passing through the vertical impervious curtain 3.

[0046] In one of the embodiments, please refer to Figure 1 , the water distribution pipe 22 includes a main pipe 221 and a plurality of branch pipes 222. The main pipe 221 is communicated with the drainage blind ditch 1. The plurality of branch pipes 222 are arranged at intervals in the first direction. One end of each branch pipe 222 is communicated with the main pipe 221. Openings are provided on the circumference of the branch pipe 222. The first direction is perpendicular to the water flow direction.

[0047] In this embodiment, the main pipeline 221 extends along the first direction and is located at the front side of the reaction packing 21. The middle part of the main pipeline 221 is communicated with one end of the water seepage pipe 11. The gushing mine acid groundwater accesses the main pipeline 221 from the drainage blind ditch 1, flows through the pipeline slope to the branch pipelines 222 arranged at equal intervals of 5 m, and then flows out through the perforated pipe to fully contact and react with the packing.

[0048] In this embodiment, both the main pipeline 221 and the branch pipelines 222 are HDPE pipelines with a diameter of dn200.

[0049] In one of the embodiments, please refer to Figure 2 , the branch pipeline 222 is bent downward and located at the bottom of the reaction packing 21.

[0050] In this embodiment, the branch pipeline 222 is bent downward and located at the bottom of the reaction packing 21, so that the branch pipeline 222 and the water outlet pipe 23 are arranged at intervals in the vertical direction, so that the acid groundwater in the branch pipeline 222 overflows into the reaction packing 21, prolonging the reaction time of the acid groundwater in the reaction packing 21 to ensure full reaction. As the upstream water continuously comes, the groundwater level in the reaction packing 21 gradually rises. When the water level reaches the elevation of the water outlet pipe 23, the pretreated slag 200 acid groundwater enters the water outlet pipe 23 and flows out of the reaction packing 21.

[0051] In one of the embodiments, please refer to Figure 1 , there are multiple water outlet pipes 23, and the multiple water outlet pipes 23 and the multiple branch pipelines 222 are alternately arranged along the first direction.

[0052] In this embodiment, the multiple water outlet pipes 23 and the multiple branch pipelines 222 are alternately arranged along the first direction. Such a setting can increase the distance between the branch pipeline 222 and the water outlet pipe 23 and reserve sufficient reaction time.

[0053] In one of the embodiments, please refer to Figure 3 , the reaction packing 21 includes a first reaction packing 211 and a second reaction packing 212 arranged in sequence from the inside to the outside. The particle size of the first reaction packing 211 is larger than that of the second reaction packing 212. The water distribution pipe 22 is located in the second reaction packing 212, and the water outlet pipe 23 is located in the first reaction packing 211.

[0054] In this embodiment, the particle size of the first reaction filler 211 is 50 - 100 mm, the particle size of the second reaction filler 212 is 30 mm - 50 mm. The first reaction filler 211 is within a range of 0.5 m around the water outlet pipe 23. The first reaction filler 211 and the second reaction filler 212 have the same raw materials inside except for the different particle sizes. The particle size of the first reaction filler 211 is larger than that of the second reaction filler 212, which facilitates the collection of acidic groundwater to the water outlet pipe 23 and at the same time prevents the precipitation formed during pretreatment from blocking the water outlet pipe 23.

[0055] In one of the embodiments, please refer to Figure 3 , the mine acidic groundwater collection and pretreatment structure further includes a groundwater sampling well 4. The groundwater sampling well 4 is located in the acidic groundwater collection and pretreatment area 2. The lower end of the groundwater sampling well 4 is communicated with the water outlet pipe 23, and the upper end of the groundwater sampling well 4 extends out of the reaction filler 21.

[0056] In this embodiment, in order to master the water quality of the mine acidic groundwater after pretreatment and before entering the water treatment equipment, and better guide the subsequent design work and optimization of process parameters, the groundwater sampling well 4 is connected to the water outlet pipe 23 through a tee, so that the groundwater in the water outlet pipe 23 can be extracted through the groundwater sampling well 4 for detection, which is beneficial to the water quality of the groundwater.

[0057] Specifically, the groundwater sampling well 4 is a HDPE sampling pipe with a diameter of dn110.

[0058] In one of the embodiments, please refer to Figure 3 , a plain concrete layer 5 is further provided on the top of the acidic groundwater collection and pretreatment area 2.

[0059] In this implementation, the thickness of the plain concrete layer 5 is 20 cm. The plain concrete layer 5 can effectively protect the reaction filler 21 and prevent external rainwater from invading into the reaction filler 21, increasing the burden on the water treatment equipment.

[0060] In this embodiment, the parts of the branch pipe 222 and the water outlet pipe 23 located in the reaction filler 21 are both wrapped with 200 g / m 2 filament non-woven geotextile.

[0061] For a better understanding of the present invention, the following Figures 1 to 3 is a detailed description of the technical solution of the present invention:

[0062] The acidic groundwater in the slag 200 in the crack flows through the slag 200, through 200 g / m 2After being filtered by the filament non-woven geotextile, it enters the reaction filler 21. The flowing acid mine water 200 is collected through the drainage blind ditch 1 and enters the main pipeline 221. The groundwater flows by gravity and is evenly distributed into each branch pipeline 222. Then, through the openings on the branch pipeline 222, it overflows into the reaction filler 21. The bottom and both sides of the vertical impervious curtain 3 are embedded in the impervious bedrock 300, which can make the acid mine water 200 stay in the reaction filler 21 and fully contact with the reaction filler 21 for pretreatment. As the upstream water continuously comes, the groundwater level in the reaction filler 21 gradually rises. When the water level reaches the elevation of the outlet pipe 23, the pretreated acid mine water 200 enters the outlet pipe 23, and then passes through the outlet pipe 23 through the vertical impervious curtain 3 and is discharged into the water treatment equipment in an organized manner after confluence.

[0063] This application can collect all the acid mine groundwater flowing through the cross-section and discharge it to the water treatment equipment at the back end in an organized manner.

[0064] In this application, both the flowing acid mine groundwater and the acid mine groundwater in the fissures can be evenly distributed in the reaction filler 21 and fully react with the reaction filler 21.

[0065] This application can regularly monitor the water quality indicators of the acid groundwater in the acid groundwater collection and pretreatment area 2 to guide the subsequent engineering design and optimization of process parameters.

[0066] The specific implementation manners of the present utility model described above do not constitute a limitation to the protection scope of the present utility model. Any other corresponding changes and deformations made according to the technical concept of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. A mine acid groundwater collection and pretreatment structure, located downstream of the mine acid groundwater contamination area, characterized in that: It includes drainage blind ditches, acid groundwater collection and pretreatment areas and vertical anti-seepage curtains arranged in sequence along the water flow direction; The drainage blind ditch is used to be buried in the slag and is connected to the acid groundwater collection and pretreatment area; The acidic groundwater collection and pretreatment area is filled with a reactive filler, and the reactive filler is used to collect the acidic groundwater and adjust the pH of the acidic groundwater; The vertical anti-seepage curtain is used to be embedded in the impermeable bedrock on both sides and the bottom, and the vertical anti-seepage curtain is used to intercept the acidic groundwater in the acidic groundwater collection and pretreatment area.

2. The mine acidic groundwater collection and pretreatment structure according to claim 1 is characterized in that: The drainage blind ditch comprises a seepage pipe and a filter cloth arranged at intervals from the inside to the outside, the circumference of the seepage pipe is provided with seepage holes, and a filter filler is provided between the filter cloth and the seepage pipe.

3. The mine acidic groundwater collection and pretreatment structure according to claim 2 is characterized in that: The diameter of the seepage hole is 8 mm, and the opening rate of the seepage pipe is greater than or equal to 2%; The filter filler is graded crushed stone with a particle size of 20 to 60 mm; The filter cloth is 200g / m 2 Filament nonwoven geotextile.

4. The mine acidic groundwater collection and pretreatment structure according to claim 1 is characterized in that: The mine acidic groundwater collection and pretreatment structure also includes a water distribution pipe and a water outlet pipe. The water distribution pipe is buried in the reaction filler, the water distribution pipe is connected to the drainage blind ditch, part of the circumference of the water distribution pipe is provided with openings, one end of the water outlet pipe is buried in the reaction filler, the other end of the water outlet pipe passes through the vertical anti-seepage curtain for connection with the water treatment equipment, and the part of the circumference of the water outlet pipe located in the reaction filler is provided with openings.

5. The mine acidic groundwater collection and pretreatment structure according to claim 4, characterized in that: The water distribution pipe includes a main pipe and multiple branch pipes. The main pipe is connected to the drainage blind ditch. The multiple branch pipes are arranged at intervals along the first direction. One end of each branch pipe is connected to the main pipe. The circumference of the branch pipe is provided with openings. The first direction is perpendicular to the water flow direction.

6. The mine acidic groundwater collection and pretreatment structure according to claim 5, characterized in that: The branch pipe is bent downward and located at the bottom of the reaction packing.

7. The mine acidic groundwater collection and pretreatment structure according to claim 5, characterized in that: There are multiple water outlet pipes, and the multiple water outlet pipes and the multiple branch pipes are alternately arranged along the first direction.

8. The mine acidic groundwater collection and pretreatment structure according to claim 4, characterized in that: The reaction filler comprises a first reaction filler and a second reaction filler arranged in sequence from the inside to the outside, the particle size of the first reaction filler is larger than that of the second reaction filler, the water distribution pipe is located in the second reaction filler, and the water outlet pipe is located in the first reaction filler.

9. The mine acidic groundwater collection and pretreatment structure according to claim 4, characterized in that: The mine acidic groundwater collection and pretreatment structure also includes a groundwater sampling well, which is located in the acidic groundwater collection and pretreatment area, the lower end of the groundwater sampling well is connected to the water outlet pipe, and the upper end of the groundwater sampling well extends out of the reaction filler.

10. The mine acidic groundwater collection and pretreatment structure according to claim 1, characterized in that: A plain concrete layer is also provided on the top of the acidic groundwater collection and pretreatment area.

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