Ecological regulation, storage and purification system and method in front of mine water industry water source plant

Abstract

The invention relates to the technical field of ecological environmental protection, and discloses an ecological regulation, storage and purification system and method in front of a mine water industry water source plant. The system comprises a drop water area, a dynamic water area and a static water area, the drop water area and the dynamic water area are sequentially arranged in the flowing direction of mine water, the dynamic water area is provided with a water supply port and a static water port, the dynamic water area is communicated with the static water area through the static water port, and the dynamic water area supplies water to a water user through the water supply port; wherein the water falling area comprises a plurality of water falling pools, the water falling pools are arranged in a step-by-step downward stepped mode in the flowing direction of mine water, the height difference of every two adjacent water falling pools is 1-3 m, anti-seepage reinforced concrete layers are arranged on the bottom wall and the side wall of each water falling pool, and gabion layers formed by grading broken coal and rock masses are arranged on the anti-seepage reinforced concrete layers. The system can carry out storage and near-natural purification on mine water by introducing an ecological regulation and storage means capable of imitating natural purification, intercepts small-particle suspended solids, and ensures that stable water quality and water quantity are provided for water users.

Description

Technical Field

[0001] The present invention relates to the field of ecological environmental protection technology, and in particular to a system and method for ecological regulation and purification of industrial water sources in front of a mine water plant. Background Art

[0002] my country has large reserves of coal resources and a wide distribution. Long-term coal mining has caused many hydrogeological effects and ecological and environmental problems. Coal resources in the west account for 70% of the country's total coal resources, but the western region has an arid-semi-arid climate, water shortages, sparse surface vegetation, and a fragile ecological environment. Coal mining has exacerbated the trend of regional water shortages, and the resulting ecological and environmental damage is difficult to recover naturally in the short term. Therefore, in mining areas with water shortages, it is of great significance to improve the utilization rate of mine water.

[0003] As an unconventional water resource, mine water is an important source of water for production, life and ecology in the arid and semi-arid coal mining areas in the west. The utilization rate of mine water resources can be greatly improved through comprehensive utilization of mine water resources, efficient reuse of saline water, zero discharge of wastewater and other water treatment processes. However, the amount and quality of mine water often fluctuate greatly with the advancement of the mining face. For water users such as coal-fired power plants and coal chemical enterprises, water sources with stable water quality and quantity are required to ensure safe production of enterprises. The regulation and stable water supply in the process of mine water utilization are the prerequisites for mine water to be used as a water source for replenishment of industrial park enterprises, and are the main technical key in the overall planning of mine water utilization.

[0004] Therefore, there is an urgent need to provide an ecological storage and purification method for industrial water sources in mines that can ensure stable water quality and quantity. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem in the prior art that the water quality and water quantity of mine water often fluctuate greatly with the advancement of the mining face, thereby failing to ensure the safe production of water users. A system and method for ecological storage and purification of mine water industrial water source plant is provided. The system can store and purify mine water in a near-natural way by introducing ecological storage and regulation means that can imitate natural purification, intercept small suspended matter and stabilize water supply, and at the same time improve the surrounding environment of energy enterprises and regulate the surrounding microclimate.

[0006] In order to achieve the above-mentioned object, the present invention provides, on one hand, an ecological regulation and purification system for industrial water source plants in mine water, the system comprising a water drop zone, a dynamic water zone and a static water zone, the water drop zone and the dynamic water zone are sequentially arranged along the flow direction of mine water, the dynamic water zone has a water supply port and a static water port, the static water port is connected to the static water zone, and the dynamic water zone supplies water to water users through the water supply port;

[0007] Wherein, the drop zone includes a plurality of drop pools, which are arranged in a stepped manner downward along the flow direction of mine water, and the height difference between two adjacent drop pools is 1 to 3 meters. The bottom wall and side wall of each drop pool are provided with an impermeable reinforced concrete layer, and a gabion layer formed by grading of broken coal rock mass is provided on the impermeable reinforced concrete layer.

[0008] Preferably, the gabion layer is formed by a plurality of gabions, wherein the gradation structure of the gabions comprises: a stone layer with a particle size of 100-500 mm, a coarse gravel layer with a particle size of 10-100 mm, a gravel layer with a particle size of 1-10 mm, and a micron-sized sand particle layer.

[0009] Preferably, the crushed coal rock mass is selected from one or more of calcite, sandstone, coal gangue, yellow clay, clinoptilolite, stilbite, volcanic rock, serpentine, bentonite, attapulgite, quartz, feldspar, clay minerals and metal oxides.

[0010] Preferably, the drop zone includes a first drop pool, a second drop pool and a third drop pool which are sequentially arranged along the flow direction of the mine water;

[0011] Preferably, in the first plunge pool, the gabion layer has a protrusion for changing the flow direction of water;

[0012] Preferably, the material of the anti-seepage reinforced concrete layer contains cement and K11 waterproof coating.

[0013] Preferably, the still water area is provided with two cloths and one membrane assembly, a sand layer, two cloths and one membrane assembly and a sand layer in sequence from bottom to top;

[0014] Preferably, a hydraulic thruster is provided in the still water area.

[0015] Preferably, the two-cloth-one-membrane assembly comprises two layers of geotextiles and one layer of HDPE anti-seepage membrane, wherein the specification of each layer of the geotextile is 500-700g / m2 polypropylene filament geotextile, and the specification of the HDPE anti-seepage membrane is 1-5mm double-rough surface anti-seepage membrane;

[0016] Preferably, the thickness of the sand layer is 10 to 30 mm.

[0017] Preferably, the system further comprises a water inlet pipe, through which the mine water enters the water drop zone, wherein a turbidity control device and a water inlet valve are arranged in the water inlet pipe, and the turbidity control device is electrically connected to the water inlet valve;

[0018] When the turbidity of the water inlet pipe exceeds a preset threshold, the turbidity control device controls the water inlet valve to close.

[0019] Preferably, a liquid level controller is provided in the drop zone, and the liquid level controller is connected to the water inlet valve;

[0020] The liquid level in the drop zone is controlled by the liquid level controller, and when the liquid level in the drop zone reaches a preset maximum liquid level, the water inlet valve is controlled to close.

[0021] Preferably, a pipe network is provided in the dynamic water area and the static water area, and the depth of the pipe network is below the frozen soil layer;

[0022] Preferably, in the plunge zone, a heating pipe is provided on the wall of each plunge pool.

[0023] The second aspect of the present invention provides a method for ecological regulation and purification of mine water industrial water source in front of the plant. The method is implemented in the system as described above, and the method includes: introducing mine water into the drop zone, and then entering the dynamic water zone after being treated in a plurality of drop pools step by step downward, part of the water in the dynamic water zone is supplied to users through the water supply port, and the remaining water is introduced into the static water zone through the static water port.

[0024] In the present invention, multiple waterfall pools are arranged in a stepped manner downward along the flow direction of mine water, and anti-seepage reinforced concrete layers and gabions are sequentially arranged on the bottom wall and side walls of each waterfall pool, so that the broken coal rock mass can better contact and react with the mine water. The long-term water-rock interaction causes the substances in the mine water and the broken coal rock mass to undergo sedimentation and precipitation. During the flow of mine water, all particles with a suspended particle density greater than the water density will undergo sedimentation and precipitation, thereby reducing the suspended matter content in the mine water. At the same time, the broken coal rock mass will undergo isomorphous substitution and surface complexation to change its own charge number, produce an adsorption effect on the solutes in the mine water, and reduce the turbidity, chromaticity, metal ion concentration and other pollutants in the water body. Therefore, the water quality of the water discharged from the purification system is stable. In addition, the water volume of the water discharged from the purification system is guaranteed by the setting of the static water area. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an implementation method of the mine water industrial water source plant front ecological storage and purification system provided by the present invention;

[0026] Figure 2 yes Figure 1 Schematic diagram of some structures in the middle drop zone;

[0027] Figure 3 yes Figure 2 A cross-sectional view of the middle drop zone;

[0028] Figure 4 It is a structural schematic diagram of the gabion layer in the ecological storage and purification system in front of the mine water industrial water source plant provided by the present invention.

[0029] Description of Reference Numerals

[0030] 1-water drop zone; 10-water drop pool; 10a-first water drop pool; 10b-second water drop pool; 10c-third water drop pool; 11-gabion layer; 110-raised part; 111-stone layer; 112-coarse gravel layer; 113-sand particle layer; 114-gravel layer; 2-dynamic water zone; 21-water supply port; 22-static water port; 3-static water zone; 31-boundary; 4-water inlet pipe. DETAILED DESCRIPTION

[0031] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0032] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0033] The present invention provides a mine water industrial water source plant front ecological storage and purification system, please refer to Figure 1-3 The system includes a water drop zone 1, a dynamic water zone 2 and a static water zone 3. The water drop zone 1 and the dynamic water zone 2 are sequentially arranged along the flow direction of the mine water. The dynamic water zone 2 has a water supply port 21 and a static water port 22. The static water port 22 is connected to the static water zone 3. The dynamic water zone 2 supplies water to water users through the water supply port 21.

[0034] The drop zone 1 comprises a plurality of drop pools 10, which are arranged in a stepped manner downward along the flow direction of mine water, and the height difference between two adjacent drop pools 10 is 1 to 3 meters. The bottom wall and side wall of each drop pool 10 are provided with an impermeable reinforced concrete layer (not shown in the figure), and a gabion layer 11 formed by grading of broken coal rock is provided on the impermeable reinforced concrete layer.

[0035] When the height difference between two adjacent plunge pools 10 is too low, the kinetic energy of the water flow will be insufficient, and additional energy will be required to make the water flow toward the moving water area 2; when the height difference between two adjacent plunge pools 10 is too high, water is easy to splash, making the water in the downstream plunge pool 10 easy to be stirred, so that impurities at the bottom of the plunge pool 10 float up, affecting the water quality. In the present invention, by setting the height of two adjacent plunge pools 10 to 1 to 3 meters, the water in the plunge pools 10 can automatically flow downward step by step, saving energy consumption and reducing the impact on water quality.

[0036] In the present invention, the mine water comes from underground drainage water or the effluent of a mine water treatment station.

[0037] In the system described in the present invention, after the water purified by the drop zone 1 enters the dynamic water zone 2, part of the output water of the dynamic water zone 2 is supplied to water users such as coal-fired power plants and coal chemical enterprises through the water supply port 21 to meet the water volume requirements of the water users, and the remaining water is introduced into the static water zone 3 through the static water port for storage. The static water zone 3 is connected to the dynamic water zone 2. In this way, when the water volume of the dynamic water zone 2 is insufficient, water can be replenished therein to ensure that the system can stably supply water to downstream water users.

[0038] The system described in the present invention stores and purifies mine water in a near-natural way by introducing ecological storage means that can simulate natural purification, and intercepts small suspended particles. At the same time, through the setting of the static water area 3, it ensures that stable water quality and water quantity are provided to water users.

[0039] In the present invention, the gabion layer 11 is formed by a plurality of gabions. Figure 4 In a preferred embodiment, the gradation structure of the gabion includes: a stone layer 111 with a particle size of 100-500 mm, a coarse gravel layer 112 with a particle size of 10-100 mm, a sand gravel layer 114 with a particle size of 1-10 mm, and a micron-sized sand particle layer 113. The combination of the above-mentioned stones of different particle sizes can make the gabion stable and compact.

[0040] Further preferably, the broken coal rock mass is graded to form a gabion in the following manner: filling in layers, the filling layers are stones with a particle size of 100 to 500 mm, coarse gravel with a particle size of 10 to 100 mm, and sand with a particle size of 1 to 10 mm from top to bottom, and then a layer of micron-sized sand particles is filled between any two layers. Specifically, for example, a micron-sized sand particle layer 113 can be filled between the stone layer 111 and the coarse gravel layer 112, or a micron-sized sand particle layer 113 can be filled between the coarse gravel and the sand. By adopting the above-mentioned grading method, the stability and density of the gabion can be further guaranteed.

[0041] In a preferred embodiment, the gabion is a cube, the thickness of the coarse gravel layer 112 is not less than 1 / 3 of the side length of the gabion cube, and the thickness of the gravel layer 114 is 1 / 6-1 / 2 of the side length.

[0042] In a preferred embodiment, when the particle size of the influent suspended matter particles D(2,3) is less than 100 microns, the thickness of the micron-sized sand particle layer 113 is not less than 1 / 4 of the side length.

[0043] In a specific embodiment, the structure of the gabion formed by the grading of the crushed coal rock mass includes, from top to bottom, a stone layer 111 with a particle size of 100 to 500 mm, a coarse gravel layer 112 with a particle size of 10 to 100 mm, a micron-sized sand particle layer 113, and a gravel layer 114 with a particle size of 1 to 10 mm.

[0044] In a specific implementation, the method of forming a gabion by crushing the coal rock mass gradation includes: unfolding the gabion mesh, folding and splicing according to the design size to form a rectangular or cube mesh box shape; using binding wire to bind and fix the edges and intersections of the mesh to ensure the firmness of the mesh box; filling the prepared stones into the gabion mesh box; the stones should be matched in size to ensure the stability and density of the gabion; when filling the stones, they should start from the four corners of the gabion mesh box and gradually fill in the middle to avoid the stones being concentrated in one place; filling in layers, the filling layers from top to bottom include: stones with a particle size of 100 to 500 mm, coarse gravel with a particle size of 10 to 100 mm, and gravel with a particle size of 1 to 10 mm, and then a layer of micron-sized sand particles is filled between the coarse gravel and the gravel. The stone filling height should be slightly lower than the upper edge of the gabion mesh box to facilitate subsequent capping and binding fixation. Place the assembled gabions on a flat impermeable layer and use connectors or anchors to fix the gabions to the surrounding structures.

[0045] The present invention does not limit the specific type and composition of the broken coal rock mass, and the broken coal rock mass located near the system can be selected according to local conditions. In the present invention, the broken coal rock mass can be one or more of calcite, sandstone, coal gangue, yellow clay, clinoptilolite, stilbite, volcanic rock, serpentine, bentonite, attapulgite, quartz, feldspar, clay minerals and metal oxides, preferably one or more of quartz, feldspar, clay minerals and metal oxides.

[0046] In order to make the crushed coal rock mass treat the pollutants in the mine water more comprehensively, it is preferred to select different types of crushed coal rock mass for compounding. In a preferred embodiment, the crushed coal rock mass is quartz, feldspar, clay minerals and metal oxides. Among them, feldspar and clay minerals provide the material basis for purifying mine water. Clay minerals will dissolve in water and provide a large amount of Al 3+ , K + 、Si 4+ Mg 2+ , Fe 2+ 、AlO 2-These ions will undergo precipitation reactions under certain acid-base conditions to form MgCO3, Al(OH)3, CaCO3, sulfide, hydroxide and carbonate precipitations, reducing the hardness of mine water and the ion content in mine water; at the same time, the broken coal rock will undergo isomorphous substitution and surface complexation to change its own charge number, adsorb solutes in mine water, and reduce turbidity, color, metal ion concentration and other pollutants in the water body.

[0047] In the present invention, the coal mine water drop area 1 can be set by utilizing the height difference of the site terrain and the design principle of adapting measures to local conditions. In a specific embodiment, the drop area 1 includes three drop pools 10 (i.e., three-level drop pools), specifically, a first drop pool 10a, a second drop pool 10b, and a third drop pool 10c, which are sequentially arranged along the flow direction of the mine water.

[0048] In a preferred embodiment, the drop zone 1 is provided with three levels of drop (ie, three drop pools 10), each level of drop is 1 to 3 meters, and the average water depth is 2 meters.

[0049] In a preferred embodiment, in the first plunge pool 10a, the gabion layer 11 has a protrusion 110, which is used to change the flow direction of the water body, increase the Reynolds number, and extend the hydraulic retention time, so that when the mine water passes through the first plunge pool 10a, the contact time between the mine water and the gabions formed by the broken coal and rock mass in the first plunge pool 10a is longer and the contact area is larger, so that the mine water treatment effect of the plunge area 1 is better. Specifically, the protrusion 110 is set in the middle and / or on both sides of the first plunge pool 10a.

[0050] In a specific embodiment, the waterfall area 1 adopts an impermeable reinforced concrete pool with an irregular natural pool shape. At the same time, a green island is designed at the waterfall position, and broken coal rock is used to form gabions through grading to break the rigid embankment of the waterfall surface. Black mountain stone landscape stones are used to embellish the waterfront. The waterfall level uses plastic stone to imitate the Black Mountain stone effect to soften the waterfall embankment, forming a natural ecological pool effect.

[0051] In a preferred embodiment, the material of the impermeable reinforced concrete layer contains cement and K11 waterproof coating.

[0052] In a specific embodiment, the bottom of each waterfall pool 10 is made of 300mm thick C25 / P6 anti-seepage reinforced concrete, three coats of cement-based penetrating crystalline waterproof coating, 20mm thick 1:2.5 cement mortar protective layer, and k11 waterproof coating; the pool wall is made of 300mm thick C25 / P6 anti-seepage reinforced concrete, three coats of cement-based penetrating crystalline waterproof coating, 20mm thick 1:2.5 cement mortar protective layer, and k11 waterproof coating; and then the stone cages are formed by grading the stacked broken coal rock mass.

[0053] In a preferred embodiment, the still water area 3 is provided with two cloths and one membrane assembly, a sand layer, two cloths and one membrane assembly and a sand layer in sequence from bottom to top. Through the above arrangement, the water quality of the still water area 3 can be improved.

[0054] Further preferably, the two-cloth-one-membrane assembly includes two layers of geotextiles and a layer of HDPE anti-seepage membrane, wherein the specification of each layer of the geotextile is 500-700g / m2 polypropylene filament geotextile, and the specification of the HDPE anti-seepage membrane is 1-5mm double-rough surface anti-seepage membrane.

[0055] Further preferably, the thickness of the sand layer is 10 to 30 mm.

[0056] In a preferred embodiment, the method of the still water area 3 is: select a relatively flat area in the site with a small vertical height difference, which is basically flat, dig a pool, and lay two layers of geotextiles and HDPE anti-seepage membranes by using the method of two cloths and one membrane. On the leveled ground, lay sand with a thickness of 10 to 30 cm (cm), and intersperse the construction with the pre-buried pipeline, and then lay "two cloths and one membrane" on it - two layers of geotextiles and one layer of HDPE anti-seepage membrane, and then lay 10 to 30 cm of sand. Among them, the specification of the geotextile is 600g / square meter polypropylene filament geotextile, and the specification of the HDPE anti-seepage membrane is 2.0mm double rough surface anti-seepage membrane.

[0057] In a preferred embodiment, a hydraulic thruster (not shown in the figure) is provided in the still water area 3. By providing the hydraulic thruster, the water flow direction can be designed to avoid eutrophication and deterioration of water quality in the still water area 3. Pollutants such as silt are more likely to be deposited at the corners of the still water area 3 and at the boundary 31 with the moving water area 2. Therefore, the hydraulic thruster is preferably provided at the corners and / or the boundary 31 of the still water area 3.

[0058] In order to improve the operational stability of the system described in the present invention, in a preferred embodiment, the system further includes a water inlet pipe 4, through which the mine water enters the water drop zone 1, and a turbidity control device (not shown in the figure) and a water inlet valve (not shown in the figure) are provided in the water inlet pipe 4, and the turbidity control device is electrically connected to the water inlet valve; when the turbidity of the water inlet pipe 4 exceeds a preset threshold, the turbidity control device controls the water inlet valve to close. The present invention uses the setting of the turbidity control device, so that when the turbidity of the mine water entering the system exceeds the preset threshold, the water inlet valve is automatically cut off to ensure stable operation of the system.

[0059] The present invention does not limit the specific threshold of the turbidity control device, and it can be designed according to actual working conditions. In a specific embodiment, the preset threshold of the turbidity control device is 100 NTU.

[0060] In a preferred embodiment, a liquid level controller (not shown in the figure) is provided in the water drop area 1, and the liquid level controller is connected to the water inlet valve; the liquid level in the water drop area 1 is controlled by the liquid level controller, and when the liquid level in the water drop area 1 reaches a preset maximum liquid level, the water inlet valve is controlled to close. The present invention is designed with the liquid level controller, so that when the water volume in the system exceeds a preset threshold value, the water outlet valve is automatically cut off in this emergency condition to further ensure the stable operation of the system.

[0061] In the present invention, the liquid level controller can be arranged in any one of the plunge pools 10 in the plunge area 1. Of course, the design of the present invention is not limited to this, and a liquid level controller can be arranged in each plunge pool 10, and when the liquid level in any one of the plunge pools exceeds a preset threshold, the water inlet valve is controlled to be closed.

[0062] In the present invention, a pipe network (not shown in the figure) is arranged in the moving water area 2 and the still water area 3 to realize the water transportation in the system. It can be understood that the pipe network includes pipes, valves and joints. Preferably, the depth of the pipe network is below the frozen soil layer. By arranging the pipe network below the frozen soil layer, when the weather is cold (the temperature is low), the water body can be kept flowing under the ice cover on the surface of the still water surface to avoid freezing.

[0063] In order to ensure the stability of the system operation, in a preferred embodiment, a heating pipe (not shown) is provided on the wall of each of the plunge pools 10 in the plunge zone 1. When the height difference between two adjacent plunge pools 10 is too high, it is not conducive to the insulation of water, and the water is easy to freeze in cold weather (low temperature), thereby affecting the operation of the system. The present invention can ensure that the water temperature in the plunge zone 1 is above zero degrees without freezing, and the water flow is fully flowed and purified to reach the dynamic water zone 2 through the design of the heating pipe and the height difference between two adjacent plunge pools 10.

[0064] In a specific implementation, the heating pipe is arranged between the anti-seepage reinforced concrete layer of the pool wall and the gabion layer 11.

[0065] In a preferred embodiment, the HDPE anti-seepage membrane is constructed according to the following process: (1) base surface treatment; (2) laying and cutting of the HDPE anti-seepage membrane; (3) alignment and alignment of the HDPE anti-seepage membrane; (4) pressing the membrane to shape; (5) wiping off dust; (6) experimental welding; (7) production welding; (8) testing welding results; (9) repairing; and (10) construction of a protective layer.

[0066] Specifically, the construction process of the HDPE anti-seepage membrane includes:

[0067] (1) Base surface treatment:

[0068] Flatness: ±5cm / m2, the base surface is flat and straight;

[0069] Compaction degree: more than 90%, after rolling, the anti-seepage membrane can be laid on it;

[0070] Longitudinal and transverse slope: Longitudinal and transverse slopes should be above 2%;

[0071] Base surface cleaning: There must be no sharp objects within a vertical depth of 2.5 cm.

[0072] (2) Laying and cutting of HDPE anti-seepage membrane:

[0073] 1) Before laying the HDPE anti-seepage membrane, first inspect and measure the laying area, and transport the anti-seepage membrane of matching size in the warehouse to the anchor trench platform according to the measured size. When laying, adopt the convenient method of "pushing and laying" from top to bottom according to the actual conditions on site;

[0074] 2) When laying HDPE anti-seepage membrane, the number of welds should be minimized, and raw materials should be saved as much as possible while ensuring quality;

[0075] 3) When laying, it should be extended from the bottom to the high position. Do not pull it too tight. A margin of 1.50% should be left to prepare for local sinking and stretching;

[0076] 4) The longitudinal joints of two adjacent panels should not be on the same horizontal line, but should be staggered by more than 1m;

[0077] 5) The longitudinal joint should be at least 1.50m away from the slope foot and bend foot and should be located on a flat surface;

[0078] 6) First the slope and then the bottom of the field;

[0079] 7) When laying on the slope, the film spreading direction should be basically parallel to the maximum slope line;

[0080] 8) After the HDPE anti-seepage membrane is laid, walking on the membrane surface and moving tools should be minimized. Any objects that may cause harm to the HDPE anti-seepage membrane should not be placed on the membrane or carried while walking on the membrane to avoid accidental damage to the membrane.

[0081] (3) Alignment and alignment of HDPE anti-seepage membrane:

[0082] 1) Whether it is the slope or the bottom of the field, the laying of HDPE anti-seepage membrane should be flat and straight, avoiding wrinkles and ripples, so that the two anti-seepage membranes are aligned and aligned;

[0083] 2) The overlap width is based on design requirements, generally about 10cm.

[0084] (4) Film forming:

[0085] 1) Use sand bags to press down the aligned and aligned HDPE anti-seepage membrane in time to prevent it from being pulled by wind;

[0086] 2) There are three methods for anchoring anti-seepage membranes: trench anchoring, nail anchoring and expansion bolt anchoring. In field construction, trench anchoring is usually used.

[0087] 3) When adopting groove anchoring, depending on the use conditions and stress conditions of the HDPE anti-seepage membrane, the width of the anchoring groove shall generally not be less than 0.5m-1.0m, and its depth shall not be less than 0.5m-1.0m; at the top of the anchoring groove, a certain amount of anti-seepage membrane shall be reserved according to the design requirements to prepare for local sinking and stretching;

[0088] 4) When nailing is used for anchoring, the width of the layer shall not be less than 2cm, the thickness shall not be less than 2mm, the spacing between nails shall not be greater than 400mm, and anti-corrosion measures shall be taken at the exposed parts of the layer;

[0089] 5) When using expansion bolts for anchoring, the bolt diameter shall not be less than 4mm and the spacing shall not be greater than 0.5mm. During construction, first use the prepared sandbags to temporarily fix the membrane in place to prevent the HDPE membrane from being blown and displaced by strong winds, and then use the expansion bolts for anchoring.

[0090] (5) Wipe away dust:

[0091] Wipe the weld joints with clean gauze to ensure they are free of water, dust and dirt.

[0092] (6) Experimental welding:

[0093] Test welding is carried out on HDPE impermeable membrane samples to test and adjust welding equipment;

[0094] Test welding is carried out under the same surface and environmental conditions as production welding.

[0095] (7) Production welding:

[0096] 1) Production welding can only be carried out after passing the test welding;

[0097] 2) The HDPE anti-seepage membrane at the weld should be welded as a whole, and no false welding, leaking welding or over-welding should occur;

[0098] 3) Whether it is production welding or experimental welding, the welding temperature and speed must be maintained to achieve the best welding effect;

[0099] 4) Repair with welding gun only where the repair and double seam welding machine cannot be operated;

[0100] 5) Regular maintenance of welding machinery should be carried out and residues in welding equipment should be cleaned frequently;

[0101] 6) Treatment of special parts of HDPE anti-seepage membrane welding.

[0102] 7) Slope intersection: Laying and welding are special cases. Special cutting is required according to the actual situation to make the anti-seepage membrane close to the base of the dam slope. Otherwise, it will cause "hanging" or "bulging" phenomenon;

[0103] 8) At the intersection of the slope and the bottom of the reservoir: first lay the anti-seepage membrane along the dam surface 1.5m away from the blind ditch, and then connect it to the reservoir bottom membrane; welding of two adjacent sections: first weld them well, and then press them into the blind ditch.

[0104] (8) Detection:

[0105] After the HDPE anti-seepage membrane is welded, the following parts should be inspected: all welds, weld joints, damaged repaired parts, leaky welds, repaired parts of false welds, and repaired parts that failed the previous inspection.

[0106] (9) Repair:

[0107] When repairing areas that fail the inspection, it is necessary to use a base material that is more than twice the area of ​​the damaged area for repair. Only areas that cannot be operated by the welding machine can be repaired with a welding gun.

[0108] (10) Construction of protective layer:

[0109] After welding, the HDPE anti-seepage membrane should be covered with a protective layer in time to avoid direct sunlight causing material aging. When the slope is too steep and it is difficult to lay a covering soil or gravel protective layer due to instability, the construction method of sprayed concrete protective layer can be used. For sprayed concrete, deformation joints should be set according to design requirements and water should be sprinkled in time to cure, so as to avoid cracking of the concrete layer and affect the protection effect. If plain soil and sand cushion layers are used, they should be compacted or mixed with other improved materials with consolidation effect to make the covering material compacted and stable to avoid rain erosion and expose the anti-seepage membrane.

[0110] Among them, the following requirements should be met during the construction of the protective layer: after the HDPE anti-seepage membrane is laid and welded, the protective layer should be filled in time, and the speed of filling the protective layer should be adapted to the speed of laying the HDPE anti-seepage membrane; the thickness of the protective layer should be above 10 cm; the material of the protective layer should meet the design requirements, and should not contain sharp objects or debris that can easily puncture the HDPE anti-seepage membrane.

[0111] In a preferred embodiment, the main properties of the HDPE anti-seepage membrane material must meet the requirements of Table 1 below.

[0112] Table 1

[0113]

[0114]

[0115] In order to simulate natural purification and improve the viewing experience, in a specific implementation, the road design includes: five forms of main outdoor road atmospheres and five paving materials.

[0116] Preferably, this road is generally conducive to the use of roadbed excavation as roadbed filler to fill the embankment. Silt, organic soil, etc. shall not be used directly to fill the roadbed. The roadbed compaction standard shall be implemented according to the heavy compaction standard. Before the roadbed is filled, construction waste shall be removed as appropriate. The fill shall be laid in layers and compacted evenly. The roadbed compaction degree, minimum filler strength and maximum filler particle size shall meet the requirements of Table 2 below:

[0117] Table 2

[0118]

[0119] The system provided by the present invention has good ecological regulation and purification effect on mine water through the design of the three-level waterfall, gabion layer 11, protrusion 110 (changing the flow direction of water body) and other structures in the waterfall area 1. For example: the water quality of the system inlet (coal mine drainage water) and the system outlet is analyzed, and the near-natural purification waterfall has a certain water purification capacity, among which the turbidity of the inlet and outlet can be reduced from the original 100NTU to less than 5NTU, and the chloride is reduced from more than 1000mg / L to less than 200mg / L, the chloride removal rate is more than 80%, and the turbidity removal rate is more than 95%, and the purification effect is excellent.

[0120] In the present invention, the mine water is purified by using the gabions formed by grading the broken coal rock mass in the coal mine, which has high economic value, low carbon and environmental protection. Compared with other methods for purifying mine water, it not only has the advantages of low cost and wide source of materials, but also saves the treatment cost of mine water and realizes the recycling of water resources. By reducing the cost of mine water treatment and resource utilization, it can effectively promote the sustainable development of the mining area, and has important economic benefits, environmental benefits and social benefits.

[0121] The present invention also provides a method for ecological regulation and purification of industrial water sources in front of mine water plants, which is implemented in the system as described above and comprises:

[0122] The mine water is introduced into the drop zone 1, and then enters the dynamic water zone 2 after being processed in a plurality of drop pools step by step downward. Part of the water in the dynamic water zone 2 is supplied to users through the water supply port 21, and the remaining water is introduced into the static water zone 3 through the static water port.

[0123] In the method described in the present invention, the water in the dynamic water area 2 is prioritized to meet the water needs of users, and when the water volume in the dynamic water area 2 is insufficient, the water stored in the static water area 3 is used to replenish the dynamic water area 2, thereby ensuring a stable water supply to water users.

[0124] The present invention will be described in detail below by way of examples, but the protection scope of the present invention is not limited thereto. The experimental methods in the following examples, unless otherwise specified, are conventional methods in the art. The experimental materials used in the following examples, unless otherwise specified, are commercially available products.

[0125] Example 1

[0126] This embodiment is used to illustrate the mine water industrial water source plant ecological storage and purification system and method described in the present invention.

[0127] This example selects a coal-fired power plant site in the west to build a mine water industrial water source plant front ecological storage and purification system (refer to Figure 1 ).

[0128] Site conditions and design ideas: The maximum height difference inside the site is about 8m in the east-west direction. The slope on the east side is large, with a height difference of about 6m. The slope on the west side is gentle, and the site is basically not leveled. Therefore, the design considers setting the cascade water source (waterfall area 1) on the east side and the west side as the still water area 3. Based on the cascade utilization of drainage water, a multi-level utilization mode for storing drainage water is designed. The utilization rate of drainage water is improved in multiple ways and channels. A natural terrain is created around the site to form a vertical relationship of staggered heights to purify and store the drainage water of the coal mine.

[0129] Set up a waterfall area 1 within a height difference of 6 meters on the east side of the site (refer to Figure 2-3 ): The waterfall area 1 includes three waterfall pools 10 (i.e., three-level waterfalls), which are the first waterfall pool 10a, the second waterfall pool 10b and the third waterfall pool 10c in the direction of mine water flow. Each waterfall level is 2m, the average water depth is 2m, and the waterfall area is 2013 square meters; the bottom wall and side wall of each waterfall pool 10 are provided with an impermeable reinforced concrete layer (the bottom of the pool is made of 300 thick C25 / P6 impermeable reinforced concrete, three layers of cement-based penetrating crystalline waterproof coating, 20 thick 1:2.5 cement mortar protective layer, k11 waterproof coating, and the pool wall is made of 300 thick C25 / P6 impermeable reinforced concrete, three coats of cement-based penetrating crystalline waterproof coating, 20 thick 1:2.5 cement mortar protective layer, k11 waterproof coating); stack broken coal rock mass on the top of the impermeable reinforced concrete layer to form gabions; design irregular natural pool shapes, and at the same time, design green islands at the waterfall position to break the rigid embankment of the waterfall surface, use black mountain stone landscape stones to embellish the waterfront, and use plastic stone to imitate the black mountain stone effect to soften the waterfall embankment to form a natural ecological pool effect; crushed coal rock mass is graded to form gabions according to the following process (refer to Figure 4): Layered filling, the filling layers are, from top to bottom, a stone layer 111 with a particle size of 100-500mm, a coarse gravel layer 112 with a particle size of 10-100mm, a micron-sized sand particle layer 113, and a gravel layer 114 with a particle size of 1-10mm; when the influent suspended matter is less than 100mg / L, the gabion material required to treat each cubic meter of water is not less than 20kg, and the broken coal rock mass is quartz, feldspar, clay minerals and metal oxides; in the first waterfall pool 10a, the middle of the gabion layer 11 has a protrusion 110 to change the flow direction of the water body; the wall of each waterfall pool is provided with a heating pipe.

[0130] A dynamic water zone 2 is set downstream of the drop zone 1: the depth of the pipe network in the dynamic water zone 2 is below the frozen soil layer.

[0131] A still water zone 3 is set up on the west side of the site: a pool is excavated, and two layers of geotextiles and HDPE anti-seepage membrane are laid by using the method of two cloths and one membrane. On the leveled ground, 20 cm thick sand is laid, and the construction is interspersed with the pre-buried pipes. Subsequently, "two cloths and one membrane" - two layers of geotextiles and one layer of HDPE anti-seepage membrane - are laid on it, and then 20 cm of sand is laid; the specification of the geotextile is 600g / square meter polypropylene filament geotextile, and the specification of the HDPE anti-seepage membrane is 2.0mm double-rough anti-seepage membrane; the depth of the pipe network in the still water zone 3 is below the permafrost layer; hydraulic thrusters are set at the corners and turns of the still water zone 3.

[0132] An inlet pipe 4 is arranged between the mine water source and the entrance of the drop zone 1. A turbidity control device and an inlet valve are arranged in the inlet pipe 4. The turbidity control device is electrically connected to the inlet valve. When the turbidity of the inlet pipe 4 exceeds 100NTU, the turbidity control device controls the inlet valve to close.

[0133] Process flow: The mine water source (turbidity less than 100NTU, chloride less than 1000mg / L) is introduced into the drop zone 1 through the water inlet pipe 4, and then enters the dynamic water zone 2 after being dropped through multiple drop pools 10 step by step downward for water treatment. Part of the water in the dynamic water zone 2 is supplied to users through the water supply port 21, and the remaining water in the dynamic water zone 2 is introduced into the static water zone 3 through the static water port 22. When the water volume in the dynamic water zone 2 is insufficient, it is replenished with water through the static water zone 3.

[0134] The water quality of the effluent from the testing system (randomly selected 5 testing points for testing and took the average value) showed that the effluent quality met the Class III surface water standard, with turbidity lower than 5NTU and chloride lower than 200mg / L.

[0135] Example 2

[0136] The method described in Example 1 is used for implementation, except that the first plunge pool 10a does not have a protrusion 110 for changing the flow direction of the water body.

[0137] The water quality of the effluent from the testing system (randomly selected 5 testing points for testing and took the average value) showed that the effluent quality met the Class III surface water standard, with a turbidity lower than 10 NTU and a chloride content of approximately 250 mg / L.

[0138] From the above content, it can be seen that the mine water industrial water source plant ecological storage and purification system and method provided by the present invention has excellent purification effect on mine water, can ensure the stability of water quality provided to water users, thereby ensuring the safe production of water users.

[0139] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A mine water industrial water source plant front ecological storage and purification system, characterized in that: The system comprises a water drop zone (1), a dynamic water zone (2) and a static water zone (3); the water drop zone (1) and the dynamic water zone (2) are arranged in sequence along the flow direction of mine water; the dynamic water zone (2) has a water supply port (21) and a static water port (22); the dynamic water zone (2) is connected to the static water zone (3) through the static water port (22); and the dynamic water zone (2) supplies water to water users through the water supply port (21); The drop zone (1) comprises a plurality of drop pools (10), which are arranged in a step-by-step manner downward along the flow direction of the mine water, and the height difference between two adjacent drop pools (10) is 1 to 3 meters. The bottom wall and side wall of each drop pool (10) are provided with an impermeable reinforced concrete layer, and a gabion layer (11) formed by grading of broken coal rock is provided on the impermeable reinforced concrete layer.

2. The system according to claim 1, characterized in that The gabion layer (11) is formed by a plurality of gabions, wherein the gradation structure of the gabions comprises: a stone layer (111) with a particle size of 100 to 500 mm, a coarse gravel layer (112) with a particle size of 10 to 100 mm, a sand gravel layer (114) with a particle size of 1 to 10 mm, and a micron-sized sand particle layer (113).

3. The system according to claim 1 or 2, characterized in that: The broken coal rock mass is selected from one or more of calcite, sandstone, coal gangue, yellow clay, clinoptilolite, stilbite, volcanic rock, serpentine, bentonite, attapulgite, quartz, feldspar, clay minerals and metal oxides.

4. The system according to claim 1, characterized in that The drop zone (1) comprises a first drop pool (10a), a second drop pool (10b) and a third drop pool (10c) which are arranged in sequence along the flow direction of the mine water; Preferably, in the first plunge pool (10a), the gabion layer (11) has a protrusion (110) for changing the flow direction of water; Preferably, the material of the anti-seepage reinforced concrete layer contains cement and K11 waterproof coating.

5. The system according to claim 1, characterized in that The still water area (3) is provided with two cloths and one membrane assembly, a sand layer, two cloths and one membrane assembly and a sand layer in sequence from bottom to top; Preferably, a hydraulic thruster is provided in the still water area.

6. The system according to claim 5, characterized in that The two-cloth-one-membrane assembly includes two layers of geotextiles and one layer of HDPE anti-seepage membrane, wherein the specification of each layer of the geotextile is 500-700g / m2 polypropylene filament geotextile, and the specification of the HDPE anti-seepage membrane is 1-5mm double-rough surface anti-seepage membrane; Preferably, the thickness of the sand layer is 10 to 30 mm.

7. The system according to claim 1, characterized in that The system further comprises a water inlet pipe (4), through which mine water enters the water drop zone (1), wherein a turbidity control device and a water inlet valve are arranged in the water inlet pipe (4), and the turbidity control device is electrically connected to the water inlet valve; When the turbidity of the water inlet pipe (4) exceeds a preset threshold, the turbidity control device controls the water inlet valve to close.

8. The system according to claim 7, characterized in that A liquid level controller is provided in the drop zone, and the liquid level controller is connected to the water inlet valve; The liquid level in the drop zone is controlled by the liquid level controller, and when the liquid level in the drop zone reaches a preset maximum liquid level, the water inlet valve is controlled to close.

9. The system according to claim 1, characterized in that A pipe network is provided in the moving water area (2) and the still water area (3), and the depth of the pipe network is located below the frozen soil layer; Preferably, in the plunge zone (1), a heating pipe is provided on the wall of each plunge pool (10).

10. A method for ecological regulation and purification of mine water industrial water source before the plant, characterized in that: The method is implemented in the system according to any one of claims 1 to 9, and the method comprises: Mine water is introduced into a drop zone (1), and then is processed in a plurality of drop pools (10) arranged step by step downward before entering a dynamic water zone (2). Part of the water in the dynamic water zone (2) is supplied to users through a water supply port (21), and the remaining water is introduced into a static water zone (3) through a static water port (22).

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