Mine water collection, treatment and purification integrated utilization method based on underground drainage pipeline

Abstract

The invention provides a mine water collection, treatment and purification integrated utilization method based on an underground drainage pipeline, which comprises the following steps: step 1, water source classification and identification: carrying out rapid sampling analysis on gushing water of each roadway by adopting mobile water quality detection equipment by counting water sources of different underground operation scenes; step 2, constructing a grading pipe network: optimizing pipeline layout according to a water quality classification result, and laying large-diameter composite pipe groups in parallel on a main roadway; 3, pipeline in-situ purification, wherein a gangue water purification material is pre-buried in the drainage pipeline; step 4, classified storage and deep processing; and 5, graded utilization: implementing directional water delivery through an intelligent pipe network system, realizing fixed-point matched supply of clean water and treated water, establishing an overall model for optimal configuration of water resources, and constructing a resource utilization system for water quality grading and accurate supply. According to the method, through the multi-objective optimization configuration model, the mine water recycling rate is remarkably increased, the treatment energy consumption is reduced, and technical support is provided for sustainable utilization of water resources in a mining area.

Description

Technical Field

[0001] The present invention belongs to the technical field of mine water treatment and resource utilization, and in particular relates to an integrated mine water collection, treatment and purification method based on underground drainage pipelines. Background Art

[0002] Mine water is a long-term, stable, and unconventional water resource. However, the vast majority of this water generated during coal mining is contaminated and cannot be directly discharged or utilized. If not properly treated, it can cause significant environmental harm. Mining companies in my country generate significant amounts of mine water annually. To address the need to protect water resources, they typically purify and recycle this water. However, most of this purified water, aside from the mining companies' own use, remains unused, resulting in low mine water utilization.

[0003] In recent years, the resource utilization of mine water has gradually become a research hotspot for domestic scholars. Yang Xinrong and others were among the scholars who first proposed the concept of mine water resource utilization. They discussed the necessity and feasibility of mine water resource utilization, as well as the issues and countermeasures that need to be paid attention to in the process of mine water resource utilization. Researchers have conducted extensive research on mine water hazard prevention and control and mine water resource utilization, and have successively proposed a mine water resource utilization method that optimizes the combination of the "drainage, supply, and environmental protection" trinity and the control, treatment, utilization, recharge and ecological environment protection. Researchers have summarized the treatment methods and utilization approaches for different types of mine water in my country, and demonstrated through examples that mine water resource utilization can bring good social and economic benefits. Miao Liyong and others have conducted extensive research on the treatment and utilization of high-mineralization mine water and acidic mine water, providing technical support for the implementation of mine water resource utilization.

[0004] In summary, mine water resource utilization reduces the impact of mine water discharge on the surface environment while also achieving the goal of water resource protection. Therefore, mine water resource utilization is an essential step in the development of mine water research. Overall, research on mine water resource utilization in my country started relatively late, and the technology is still in the experimental stage. Further research is needed on mine water treatment and purification processes, as well as graded recycling. Summary of the Invention

[0005] Purpose of the Invention: The present invention aims to address the shortcomings of existing technologies by providing an integrated method for collecting, treating, and purifying mine water using underground drainage pipelines. This method can rationally allocate mine water resources and achieve stable and efficient utilization of mine water. The present invention comprises the following steps:

[0006] Step 1: Water source classification and identification: By statistically analyzing the water sources in different underground operation scenarios, mobile water quality testing equipment is used to quickly sample and analyze the water inflow from each tunnel. Based on the "Surface Water Environmental Quality Standard" GB / T19223-2015, a prediction model is established for subsequent graded treatment. Mine water is classified into four categories based on water quality: clean, suspended solids contaminated, acidic contaminated, and highly mineralized.

[0007] Step 2: Construct a hierarchical pipe network: Optimize the pipeline layout based on the water quality classification results. Lay multiple types of large-diameter (300-500mm) composite pipe groups in parallel in the main lanes. The composite pipe groups adopt a main pipeline and auxiliary diversion layer structure. The main drainage pipeline uses a steel-framed plastic composite pipe. Its outer layer is made of high-density polyethylene (HDPE), and its inner layer is an epoxy resin anti-corrosion layer that forms a synergistic structure with a nano-TiO2 antibacterial coating. This pipe material is a specific compliant pipe network material. Drainage branch pipes with a nominal diameter of 100-200mm are used at the end of the branch lanes. The drainage branch pipes are made of high-strength Type II heat-resistant polyethylene pipes.

[0008] The water supply pipeline uses high-strength Type II heat-resistant polyethylene pipes with a nominal diameter of 100-200mm. The terminal pipes extend independently to each water node, forming a differentiated pipeline network with a wide trunk channel for diversion and narrow terminal pipes for specialized transportation. This accurately matches the transportation requirements of different water qualities and realizes classified water transportation without mixing.

[0009] Step 3, in-situ pipeline purification: Pre-buried gangue water purification material in the drainage pipeline. The water purification material is prepared with fly ash, slag, and desulfurization gypsum in a mass ratio of 5:4:1 to form a powder matrix. 10% alkaline activator is added to form a porous structure. The suspended solids are intercepted by physical filtration and heavy metal ions are captured by chemical adsorption. At the same time, the acidic water quality is neutralized to a neutral range.

[0010] Step 4, Classification, Storage, and Deep Treatment: Utilize floor collapse columns, abandoned tunnels, or newly constructed water silos to construct secondary water storage space, which is divided into four independent water storage units based on water quality classification results. Mine water treated with waste rock purification materials is further purified using electrodialysis (for ionic pollutants) or reverse osmosis (for high mineralization) to ensure that the water quality meets subsequent utilization standards.

[0011] Step 5: Gradual utilization: Based on the water quality requirements and water consumption data at the water demand end, directional water delivery is implemented through the intelligent pipe network system to achieve targeted matching supply of clean water and treated water, establish an overall model for optimal allocation of water resources, and build a resource utilization system with water quality grading and precise supply.

[0012] In step 1, collect roof water, fault water, aquifer water, goaf water, old kiln water, working face water, working face equipment water, dust removal water, equipment cooling water, and drainage containing complex pollutants (such as oil leakage wastewater, which often contains heavy metal ions, oil-based organic matter and various chemical additives);

[0013] In step 1, the collected water is tested for water quality, and the pH value, total dissolved solids (TDS), turbidity (NTU) and characteristic pollutant concentrations are quantitatively determined. If the pH is 6.8-7.5, TDS < 1000 mg / L, suspended solids ≤ 30 mg / L, and heavy metal ions are not detected, it is classified as clean; if the turbidity is > 50 NTU, Fe 3+ If the concentration is >5mg / L, it is classified as suspended matter pollution type; if the pH is <5.5 and the SO42- concentration is >1000mg / L, it is classified as acidic pollution type; if the TDS is >3000mg / L and the heavy metal ions exceed the standard (such as Pb2+ >0.1mg / L), it is classified as high mineralization type.

[0014] In step 2, the drainage branch pipeline is constructed as follows: the drainage branch pipe is laid along the side end of the tunnel. When the drainage branch pipe outlet and the secondary water storage space have a positive height difference (drop ≥ 3m), the flexibility of the Type II heat-resistant polyethylene pipe is naturally laid along the slope of the tunnel to achieve gravity self-flow transportation; when it is a reverse height difference (drop < 3m), a pumping device is configured from the end of the drainage branch pipe to complete the reverse classification and transportation of the differentiated mine water through pressure coordination, forming a graded pipe network closed-loop system with drainage and water supply pressure linkage.

[0015] In step 3, the porosity of the porous structure is 30% to 45%, and the specific surface area is ≥ 200m 2 / g;

[0016] The neutral range refers to a pH range of 6.5 to 8.5.

[0017] In step 3, the water-binder ratio of the water purification material is in the range of 0.42 to 0.45, and the water-binder ratio decreases as the content of suspended solids in the mine water increases. The alkaline activator of the water purification material is compounded with sodium hydroxide and sodium silicate in the form of Na2O·nSiO2, wherein the alkaline activator modulus n is 1.0 to 1.5. For acidic mine water or highly mineralized mine water with a divalent heavy metal ion concentration of more than 60% of the total heavy metal ion concentration, the alkaline activator modulus n is 1.0 to 1.2; for highly mineralized mine water with a trivalent heavy metal ion concentration of more than 60% of the total heavy metal ion concentration, the alkaline activator modulus n is 1.3 to 1.5.

[0018] In step 4, the clean mine water source is less polluted. The clean mine water is discharged into the closed goaf. After the goaf is self-purified and filtered, the water is lifted to the surface by a lifting pump to be treated in a purification plant to meet the Class III standard of the "Groundwater Quality Standard";

[0019] Electrodialysis treatment of suspended matter-contaminated mine water and acid-contaminated mine water to meet Class IV standards of the Groundwater Quality Standards;

[0020] The heavy metal ion content in highly mineralized mine water exceeds the standard, and underground purification and utilization are implemented. After deep treatment, it must meet Class V standards of the "Groundwater Quality Standards".

[0021] In step 5, due to the needs of safe production and stable production, the water quality requirements for the comprehensive mining working face, excavation head, underground fire prevention water bags, underground water supply and rescue, power plant cooling, mine landscaping and greening water use areas, and ecological management and restoration water use areas are medium, and the water resource supply must be continuous and stable without interruption. The treated clean mine water and suspended matter mine water are mainly used as the water source for these water use areas.

[0022] In step 5, underground dust prevention, water sprinkling, coal seam water injection, goaf area reinjection water, etc., these areas have lower requirements on water quality. The treated acidic mine water and heavy metal contaminated mine water are mainly used as water sources for these water use areas after treatment.

[0023] Step 5 includes: allocating the mine water use areas corresponding to the mining area water use according to the water use allocation model:

[0024] The objective function for maximizing the economic benefits of regional water supply is:

[0025]

[0026] Where f1(x) is the objective function for maximizing the economic benefits of regional water supply, x is a decision variable vector, including the water supply volume of each water source to each user, K is the total number of regions, J(k) is the total number of users in the kth region, and I(k) is the total number of independent water sources in the kth region. They are the water supply from independent water source i to user j in sub-area k and the water supply from public water source c to user j in sub-area k (in ten thousand m 3 ); The benefit coefficients of independent water source i supplying water to user j in sub-area k and public water source c supplying water to user j in sub-area k are (yuan / m 3 ); are the cost coefficients of independent water source i supplying water to user j in sub-area k and public water source c supplying water to user j in sub-area k (yuan / m 3 ); are the water supply order coefficient of the independent water source i and the water supply order coefficient of the public water source c in the k sub-area respectively; is the water use equity coefficient of user j in sub-area k; ω k is the weight coefficient of k sub-area;

[0027] Environmental benefits refer to the minimum emission of important regional pollutants, which is expressed as the minimum emission of chemical oxygen demand (COD). The maximum environmental benefit objective function f2(x) for regional water supply is:

[0028]

[0029] in is the concentration of important pollution factors (chemical oxygen demand COD) in the wastewater discharged by user j in sub-area k (mg / L); is the wastewater discharge coefficient of user j in sub-area k;

[0030] The objective function f3(x) for maximizing the social benefit of regional water supply is:

[0031]

[0032] in is the water demand of user j in sub-area k (10,000 m 3 ), M is the number of public water sources;

[0033] The optimal allocation of regional water resources is naturally subject to various constraints such as the water supply capacity of the regional water supply system and the water demand capacity of the regional water demand system;

[0034] Establish water supply capacity constraints for regional water supply systems, including:

[0035] Public water sources:

[0036]

[0037]

[0038] in is the maximum water delivery capacity of public water source c to region k, W C is the total water supply capacity of the public water source c, are the relevant parameters of water sources in region k;

[0039] Independent water source:

[0040]

[0041] Constraints on water source delivery capacity:

[0042]

[0043]

[0044] in is the maximum water delivery capacity of water source i in sub-area k, Q c is the maximum water delivery capacity of the public water source c;

[0045] The objective function and constraints are combined to form the overall model for optimal allocation of water resources:

[0046] F(X)=opt{f1(x),f2(x),f3(x)},

[0047]

[0048] Where F(X) is the overall objective function of water resources optimization allocation, and opt represents the optimization operator.

[0049] The present invention also provides an electronic device, comprising a processor and a memory, wherein the memory stores program code, and when the program code is executed by the processor, the processor executes the steps of the method.

[0050] The present invention also provides a storage medium storing a computer program or instruction, which executes the steps of the method when the computer program or instruction is run on a computer.

[0051] The beneficial effects of the present invention are:

[0052] (1) By comprehensively considering the water quality characteristics of mine water production points and water quality requirements of water use points, starting from the source of mine water production and making full use of the interconnection and self-purification functions of underground goafs, the production, living and ecological utilization of mine water are realized.

[0053] (2) Through the full-chain technology system of precise classification, tree-like pipeline distribution, solid waste-based material purification and multi-objective intelligent optimization, the cost and energy consumption of mine water treatment can be significantly reduced, the utilization rate of coal-based solid waste resources can be improved, the efficient recycling of underground mine water resources can be promoted, and the construction of green mines can be promoted.

[0054] (3) The cascade utilization technology of mine water resources can achieve good economic, environmental and social benefits, and is particularly worthy of promotion and application in water-scarce mining areas in the west. However, it is necessary to determine the optimal resource utilization plan based on a comprehensive analysis of the mine's existing water treatment facilities, water inflow, water quality and water demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, and the above and / or other advantages of the present invention will become more apparent.

[0056] Figure 1 Schematic diagram of the overall process of the method of the present invention.

[0057] Figure 2 Schematic diagram of the circulation principle of the method of the present invention.

[0058] Figure 3 This is a system process diagram of the method of the present invention. DETAILED DESCRIPTION

[0059] The embodiment of the present invention provides an integrated method for collecting, treating and purifying mine water based on an underground drainage pipeline, comprising the following steps:

[0060] Step 1: Water source classification and identification: By statistically analyzing the water sources in different underground operation scenarios, mobile water quality testing equipment is used to quickly sample and analyze the water inflow from each tunnel. Based on the "Surface Water Environmental Quality Standard" GB / T19223-2015, a prediction model is established for subsequent graded treatment. Mine water is classified into four categories based on water quality: clean, suspended solids contaminated, acidic contaminated, and highly mineralized.

[0061] Step 2: Construct a hierarchical pipe network: Optimize the pipeline layout based on the water quality classification results. Lay multiple types of large-diameter (300-500mm) composite pipe groups in parallel in the main lanes. The composite pipe groups adopt a main pipeline and auxiliary diversion layer structure. The main drainage pipeline uses a steel-framed plastic composite pipe. Its outer layer is made of high-density polyethylene (HDPE), and its inner layer is an epoxy resin anti-corrosion layer that forms a synergistic structure with a nano-TiO2 antibacterial coating. This pipe material is a specific compliant pipe network material. Drainage branch pipes with a nominal diameter of 100-200mm are used at the end of the branch lanes. The drainage branch pipes are made of high-strength Type II heat-resistant polyethylene pipes.

[0062] The water supply pipeline uses high-strength Type II heat-resistant polyethylene pipes with a nominal diameter of 100-200mm. The terminal pipes extend independently to each water node, forming a differentiated pipeline network with a wide trunk channel for diversion and narrow terminal pipes for specialized transportation. This accurately matches the transportation requirements of different water qualities and realizes classified water transportation without mixing.

[0063] Step 3, in-situ pipeline purification: Pre-buried gangue water purification material in the drainage pipeline. The water purification material is prepared with fly ash, slag, and desulfurization gypsum in a mass ratio of 5:4:1 to form a powder matrix. 10% alkaline activator is added to form a porous structure. The suspended solids are intercepted by physical filtration and heavy metal ions are captured by chemical adsorption. At the same time, the acidic water quality is neutralized to a neutral range.

[0064] Step 4, Classification, Storage, and Deep Treatment: Utilize floor collapse columns, abandoned tunnels, or newly constructed water silos to construct secondary water storage space, which is divided into four independent water storage units based on water quality classification results. Mine water treated with waste rock purification materials is further purified using electrodialysis (for ionic pollutants) or reverse osmosis (for high mineralization) to ensure that the water quality meets subsequent utilization standards.

[0065] Step 5: Gradual utilization: Based on the water quality requirements and water consumption data at the water demand end, directional water delivery is implemented through the intelligent pipe network system to achieve targeted matching supply of clean water and treated water, establish an overall model for optimal allocation of water resources, and build a resource utilization system with water quality grading and precise supply.

[0066] In step 1, collect roof water, fault water, aquifer water, goaf water, old kiln water, working face water, working face equipment water, dust removal water, equipment cooling water, and drainage containing complex pollutants (such as oil leakage wastewater, which often contains heavy metal ions, oil-based organic matter and various chemical additives);

[0067] In step 1, the collected water is tested for water quality, and the pH value, total dissolved solids (TDS), turbidity (NTU) and characteristic pollutant concentrations are quantitatively determined. If the pH is 6.8-7.5, TDS < 1000 mg / L, suspended solids ≤ 30 mg / L, and heavy metal ions are not detected, it is classified as clean; if the turbidity is > 50 NTU, Fe 3+ If the concentration is greater than 5mg / L, it is classified as suspended solids pollution type; if the pH is less than 5.5 and the SO42- concentration is greater than 1000mg / L, it is classified as acidic pollution type; if the TDS is greater than 3000mg / L and the heavy metal ions exceed the standard (such as Pb 2 +>0.1mg / L), it is classified as high mineralization type.

[0068] In step 2, the drainage branch pipeline is constructed as follows: the drainage branch pipe is laid along the side end of the tunnel. When the drainage branch pipe outlet and the secondary water storage space have a positive height difference (drop ≥ 3m), the flexibility of the Type II heat-resistant polyethylene pipe is naturally laid along the slope of the tunnel to achieve gravity self-flow transportation; when it is a reverse height difference (drop < 3m), a pumping device is configured from the end of the drainage branch pipe to complete the reverse classification and transportation of the differentiated mine water through pressure coordination, forming a graded pipe network closed-loop system with drainage and water supply pressure linkage.

[0069] In step 3, the porosity of the porous structure is 30% to 45%, and the specific surface area is ≥ 200m 2 / g;

[0070] The neutral range refers to a pH range of 6.5 to 8.5.

[0071] In step 3, the water-binder ratio of the water purification material is in the range of 0.42 to 0.45, and the water-binder ratio decreases as the content of suspended solids in the mine water increases. The alkaline activator of the water purification material is compounded with sodium hydroxide and sodium silicate in the form of Na2O·nSiO2, wherein the alkaline activator modulus n is 1.0 to 1.5. For acidic mine water or highly mineralized mine water with a divalent heavy metal ion concentration of more than 60% of the total heavy metal ion concentration, the alkaline activator modulus n is 1.0 to 1.2; for highly mineralized mine water with a trivalent heavy metal ion concentration of more than 60% of the total heavy metal ion concentration, the alkaline activator modulus n is 1.3 to 1.5.

[0072] In step 4, the clean mine water source is less polluted. The clean mine water is discharged into the closed goaf. After the goaf is self-purified and filtered, the water is lifted to the surface by a lifting pump to be treated in a purification plant to meet the Class III standard of the "Groundwater Quality Standard";

[0073] Electrodialysis treatment of suspended matter-contaminated mine water and acid-contaminated mine water to meet Class IV standards of the Groundwater Quality Standards;

[0074] The heavy metal ion content in highly mineralized mine water exceeds the standard, and underground purification and utilization are implemented. After deep treatment, it must meet Class V standards of the "Groundwater Quality Standards".

[0075] In step 5, due to the needs of safe production and stable production, the water quality requirements for the comprehensive mining working face, excavation head, underground fire prevention water bags, underground water supply and rescue, power plant cooling, mine landscaping and greening water use areas, and ecological management and restoration water use areas are medium, and the water resource supply must be continuous and stable without interruption. The treated clean mine water and suspended matter mine water are mainly used as the water source for these water use areas.

[0076] In step 5, underground dust prevention, water sprinkling, coal seam water injection, goaf area reinjection water, etc., these areas have lower requirements on water quality. The treated acidic mine water and heavy metal contaminated mine water are mainly used as water sources for these water use areas after treatment.

[0077] Step 5 includes: allocating the mine water use areas corresponding to the mining area water use according to the water use allocation model:

[0078] The objective function for maximizing the economic benefits of regional water supply is:

[0079]

[0080] Where f1(x) is the objective function for maximizing the economic benefits of regional water supply, x is a decision variable vector, including the water supply volume of each water source to each user, K is the total number of regions, J(k) is the total number of users in the kth region, and I(k) is the total number of independent water sources in the kth region. They are the water supply from independent water source i to user j in sub-area k and the water supply from public water source c to user j in sub-area k (in ten thousand m 3 ); The benefit coefficients of independent water source i supplying water to user j in sub-area k and public water source c supplying water to user j in sub-area k are (yuan / m 3 ); are the cost coefficients of independent water source i supplying water to user j in sub-area k and public water source c supplying water to user j in sub-area k (yuan / m 3 ); are the water supply order coefficient of the independent water source i and the water supply order coefficient of the public water source c in the k sub-area respectively; is the water use equity coefficient of user j in sub-area k; ω k is the weight coefficient of k sub-area;

[0081] Environmental benefits refer to the minimum emission of important regional pollutants, which is expressed as the minimum emission of chemical oxygen demand (COD). The maximum environmental benefit objective function f2(x) for regional water supply is:

[0082]

[0083] in is the concentration of important pollution factors (chemical oxygen demand COD) in the wastewater discharged by user j in sub-area k (mg / L); is the wastewater discharge coefficient of user j in sub-area k;

[0084] The objective function f3(x) for maximizing the social benefit of regional water supply is:

[0085]

[0086] in is the water demand of user j in sub-area k (10,000 m 3 ), M is the number of public water sources;

[0087] The optimal allocation of regional water resources is naturally subject to various constraints such as the water supply capacity of the regional water supply system and the water demand capacity of the regional water demand system;

[0088] Establish water supply capacity constraints for regional water supply systems, including:

[0089] Public water sources:

[0090]

[0091] in is the maximum water delivery capacity of public water source c to region k, W C is the total water supply capacity of the public water source c, are the relevant parameters of water sources in region k;

[0092] Independent water source:

[0093]

[0094] Constraints on water source delivery capacity:

[0095]

[0096] in is the maximum water delivery capacity of water source i in sub-area k, Q c is the maximum water delivery capacity of the public water source c; the objective function and the constraints are combined to form the overall model of water resources optimization allocation:

[0097] F(X)=opt{f1(x),f2(x),f3(x)},

[0098]

[0099] Where F(X) is the overall objective function of water resources optimization allocation, and opt represents the optimization operator.

[0100] like Figure 1 As shown in the figure, the whole process of mine water "source collection - graded transportation - in-situ purification - classified storage - deep treatment - cascade utilization" is described, reflecting the cascade structure of "differentiation without mixing".

[0101] like Figure 2 As shown, the “collection-processing-reuse-regeneration” cycle is presented, with the forward (water supply) and reverse (drainage regeneration) processes marked, highlighting the closed-loop control of the linkage between pumping and main pressure to achieve a dynamic balance of water resources.

[0102] like Figure 3 As shown, the system process is refined, including the pipe network material, pipe diameter, purification module and intelligent control (valves, pressure parameters), corresponding to the technical features of the claims, and clarifying the "water supply-drainage-circulation" integration.

[0103] Various types of mine water samples are collected and tested on-site underground. After testing, the water quality type of the mine water in the area is determined, and the mine water is divided into grades from high to low according to the water quality: clean mine water, mine water containing suspended matter, acidic mine water, and highly mineralized mine water.

[0104] Taking Yushuquan Coal Mine in Kuqa City, Xinjiang as an example, a mine water quality analysis experiment was conducted. Four types of water samples were selected from Yushuquan Coal Mine, including surface water, burned rock water, old goaf water, and working face water. The sampling plan is shown in Table 1.

[0105] Table 1

[0106]

[0107] According to the water quality test results of Yushuquan Coal Mine, the mine water of Yushuquan Coal Mine is divided into types, including: clean mine water, high suspended matter mine water, high mineralization mine water, mine water containing special components and acidic mine water.

[0108] Based on the water quality test results, Yushuquan Coal Mine implemented a hierarchical pipe network construction:

[0109] Main tunnel: Four DN500 HDPE pipelines are laid in parallel to transport clean water (s1), water with suspended matter (s2), acidic water (s3), and highly mineralized water (s4). This design, based on the characteristics of mine water quality, achieves differentiated transportation of different water qualities through a graded pipeline network, effectively reducing the risk of cross-contamination and improving pipeline transportation efficiency.

[0110] Branch tunnels: DN150 steel pipes are used at the ends, extending independently to goafs, water tanks, or purification stations based on water quality. This design ensures that mine water of varying quality is delivered to the appropriate treatment facilities along a predetermined path, improving system flexibility and reliability.

[0111] Pumping configuration: Install a submersible pump (flow rate 50m) at the end of the tunnel with reverse height difference > 5m 3 / h, lift 30m), ensuring the combination of gravity flow and pumping.

[0112] Furthermore, pipeline in-situ purification and purification material preparation:

[0113] Matrix ratio: fly ash (50%), slag (40%), and desulfurized gypsum (10%) are mixed and ground to a particle size of ≤50 μm.

[0114] Alkali activator: compound NaOH and Na2SiO3 (mass ratio 1:3) according to the module n=1.2, and the addition amount is 10%.

[0115] Molding process: The mixture is pressed into 100mm×100mm×100mm porous cubes (porosity 38%, specific surface area 230m 2 / g), embedded in the inner wall of the drainage pipe, with a spacing of 1m / piece.

[0116] Furthermore, the compressive strength of the gangue-based material is ≥15MPa.

[0117] Adsorption kinetics experiments show that:

[0118] Pb 2 The adsorption capacity of + was 48.7 mg / g (Langmuir model fitting degree R 2 =0.992);

[0119] The reaction time for neutralization of acid mine water (pH = 3.5) to pH = 7.2 is ≤ 45 minutes;

[0120] Suspended solids removal rate> 92% (when inlet turbidity ≤ 200 NTU);

[0121] Furthermore, the plan uses abandoned tunnels to reconstruct four 5000m 3 Four types of mine water are stored in independent water tanks, and high-mineralization water is treated by reverse osmosis (salt removal rate > 98%, water TDS ≤ 500 mg / L), electrodialysis (current density 50A / m 2 , recovery rate > 75%) to treat acidic water, and clearly define the water outlet standards for clean water reaching Class III (domestic water supply), water containing suspended matter reaching Class IV (industrial cooling), and acidic and highly mineralized water reaching Class V (dust prevention and sprinkling).

[0122] The water demand areas and water quality requirements are shown in Table 2.

[0123] Table 2

[0124] Water demand areas Water quality requirements Match mine water type <![CDATA[Water consumption (u1) in fully mechanized coal mining face]]> Low hardness, non-corrosive, suspended matter ≤ 50mg / L Mine water containing suspended matter <![CDATA[Underground water supply and rescue (u2)]]> Non-toxic, low mineralization, in line with domestic water standards (Class III) Clean mine water <![CDATA[Dust-proof sprinkler (u3)]]> Neutral (pH 6.5-8.5), non-toxic Acidic mine water <![CDATA[Underground fire prevention water bag (u4)]]> Low suspended matter (≤30mg / L), neutral, no sediment Clean mine water <![CDATA[Water for the tunneling heading face (u5)]]> Medium water quality, suspended solids ≤ 100mg / L, no strong corrosiveness Highly mineralized mine water

[0125] Solve the multi-objective model based on the NSGA-II algorithm (parameters: population size 100, number of iterations 500),

[0126] (1) Coding design: adopt real number coding strategy, decision variables Represents the water supply distribution matrix of each water source to users;

[0127] (2) Fitness function: economic benefit f1(x), environmental benefit f2(x), and social benefit f3(x) are used as three independent fitness targets;

[0128] (3) Constraint processing: water supply capacity constraints and water delivery capacity constraints are converted into fitness penalty terms through the penalty function method;

[0129] The results of water resource allocation optimization at Yushuquan Coal Mine show that: economic benefits increased by 18%; COD emissions decreased by 46%; the total regional water shortage dropped to 0 annually, achieving a dynamic balance between supply and demand.

[0130] Taking the Shicao Village Coal Mine of Ningxia Coal Industry as an example, the sub-district division and water source classification were first carried out. Based on the topography and water resources of the Shicao Village Coal Mine, the mine area was divided into multiple sub-districts. Two types of water sources were defined based on the scope of water supply: public water sources and independent water sources. Public water sources are those that can simultaneously supply water to two or more sub-districts, such as inter-regional water transfer systems and main roadway water collection systems. Independent water sources serve only a single sub-district, such as local groundwater and branch roadway wastewater reuse units.

[0131] In combination with the mining area development plan, a regional circulating water supply network is constructed, and cross-sub-area coordinated transmission and distribution is achieved through a tree-like pipeline network to improve water resource utilization efficiency.

[0132] Water source-water use system composition: The water resource allocation system consists of the following modules:

[0133] (1) Water source classification and identification module: A portable mine water source rapid identification instrument (compliant with GB / T19223-2015 standard) is used to conduct real-time detection of water in each sub-area of ​​the mining area and classify it into four categories: clean water (pH 6.8-7.5, TDS < 1000 mg / L), water containing suspended matter (turbidity > 50 NTU), acidic water (pH < 5.5), and highly mineralized water (TDS > 3000 mg / L).

[0134] (2) Hierarchical pipe network construction module: DN400mm HDPE composite pipe groups (four types of main pipes for clean water, suspended solids water, acidic water, and highly mineralized water) are laid in parallel in the main tunnels. DN150mm steel pipes are used at the ends of the branch tunnels to extend to the user nodes. The clean water pipeline is connected to the underground water supply and rescue station (u4), and the acidic water pipeline is extended to the dust prevention sprinkler point (u3).

[0135] (3) Pipeline in-situ purification module: Gangue-based composite purification material (fly ash: slag: desulfurized gypsum = 5:4:1, mixed with 10% alkali activator, porosity 40%, specific surface area 220m) is embedded in the drainage pipeline. 2 / g), achieving a suspended solids removal rate of ≥88% (influent turbidity ≤150NTU), neutralization of acidic water to pH 7.0-7.5, and a heavy metal adsorption rate of >80%.

[0136] (4) Classification storage and deep processing module: Use abandoned tunnels to transform secondary water storage units (total capacity 12,000 m 3 ), clean water storage tank (3000m 3 ) After reverse osmosis treatment (salt removal rate 95%), high mineralization water storage tank (4000m 3 ) using electrodialysis (current density 40A / m 2 ).

[0137] Sub-area division and water source classification:

[0138] (1) Production core area (sub-area k1): including coal mining working face and tunneling head, which requires continuous and stable water supply. The water quality requirement is medium (suspended matter <100 mg / L, pH 6.5-8.5), and mainly relies on clean mine water and treated water containing suspended matter.

[0139] (2) Ecological restoration area (sub-area k2): Located in the eastern part of the mining area with good coal content, it requires ecological water replenishment and has low water quality requirements (COD < 30 mg / L). Treated acidic water and high-mineralization water are preferred.

[0140] (3) Ground industrial area (sub-area k3): Water used for power plant cooling and coal washing plants requires high-purity water (TDS < 500 mg / L), which is supplied by clean water treated by reverse osmosis.

[0141] (4) Emergency support area (sub-area k4): fire-proof water bags, water supply and rescue stations, requiring stable water quality (turbidity <5NTU), and storage capacity ≥3000m 3 , equipped with electric regulating valve and variable frequency pump group linkage, the response time is ≤10 minutes.

[0142] Shared water source collaborative configuration model:

[0143] 1. Objective function:

[0144] (1) Economic benefits:

[0145]

[0146] (2) Environmental benefits:

[0147]

[0148] (3) Social benefits:

[0149]

[0150] 2. Constraints:

[0151] (1) Water supply capacity constraint: Annual water supply of public water source S4 ≤ 12 million m 3 , the maximum water transfer capacity of a single user in sub-area k1 is Q c =4 million m 3 ;

[0152] (2) Water quality constraints: COD ≤ 30 mg / L in ecological restoration areas and TDS ≤ 500 mg / L in power plant cooling water;

[0153] (3) Dynamic control constraints: Pipeline network leakage rate ≤ 3.5%, water shortage response time ≤ 15 minutes.

[0154] Construct a multi-objective evolutionary optimization framework based on the NSGA-II algorithm (parameters: population size 100, number of iterations 500):

[0155] (1) Coding design: adopt real number coding strategy, decision variables Represents the water supply distribution matrix of each water source to users;

[0156] (2) Fitness function: economic benefit f1(x), environmental benefit f2(x), and social benefit f3(x) are used as three independent fitness targets;

[0157] (3) Constraint processing: water supply capacity constraints and water delivery capacity constraints are converted into fitness penalty terms through the penalty function method;

[0158] The optimization results show that: economic benefits increased by 23%; COD emissions decreased by 42%; the total regional water shortage was reduced to 0 annually, achieving a dynamic balance between supply and demand.

[0159] The present invention provides an integrated method for collecting, treating, and purifying mine water based on underground drainage pipelines. There are many methods and approaches to implement this technical solution. The above is only a preferred embodiment of the present invention. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention. Any components not specified in this embodiment may be implemented using existing technologies.

Claims

1. A method for integrated collection, treatment and purification of mine water based on underground drainage pipelines, characterized in that: The following steps are involved: Step 1: Water source classification and identification: By counting the water sources in different underground operation scenarios, mobile water quality testing equipment is used to quickly sample and analyze the water inflow from each tunnel. The mine water is classified into four categories based on water quality: clean, suspended solids contaminated, acidic contaminated, and highly mineralized. Step 2: Construct a hierarchical pipe network: Optimize the pipeline layout based on the water quality classification results. Multiple types of large-diameter composite pipe groups are laid in parallel in the main lanes. The composite pipe groups use a main pipeline and auxiliary diversion layer structure. The main drainage pipeline uses a steel-framed plastic composite pipe with an outer layer of high-density polyethylene (HDPE) and an inner layer of epoxy resin anti-corrosion layer that forms a synergistic structure with a nano-TiO2 antibacterial coating. Drainage branch pipes with a nominal diameter of 100 to 200 mm are installed at the end of the branch lanes. The drainage branch pipes use high-strength Type II heat-resistant polyethylene pipes. The water supply pipeline uses high-strength II type heat-resistant polyethylene pipe with a nominal diameter of 100-200mm. The terminal pipe is independently extended to each water node to achieve water quality classification and non-mixing. Step 3, in-situ pipeline purification: Pre-buried gangue water purification material in the drainage pipeline. The water purification material is prepared with fly ash, slag, and desulfurization gypsum in a mass ratio of 5:4:1 to form a powder matrix. 10% alkaline activator is added to form a porous structure. The suspended solids are intercepted by physical filtration and heavy metal ions are captured by chemical adsorption. At the same time, the acidic water quality is neutralized to a neutral range. Step 4, Classification, Storage and Deep Treatment: Utilize floor collapse columns, abandoned tunnels or newly built water silos to construct secondary water storage space, which is divided into four independent water storage units based on water quality classification results. Mine water treated with waste rock purification materials is further purified using electrodialysis or reverse osmosis. Step 5: Gradual utilization: Based on the water quality requirements and water consumption data at the water demand end, directional water delivery is implemented through the intelligent pipe network system to achieve targeted matching supply of clean water and treated water, establish an overall model for optimal allocation of water resources, and build a resource utilization system with water quality grading and precise supply.

2. The method according to claim 1, characterized in that In step 1, collect roof water, fault water, aquifer water, goaf water, old kiln water, working face water, working face equipment water, dust removal water, equipment cooling water, and drainage containing complex pollutants.

3. The method according to claim 2, characterized in that In step 1, the collected water is tested for water quality, and the pH value, total dissolved solids, turbidity and characteristic pollutant concentrations are quantitatively determined. If the pH is 6.8-7.5, TDS < 1000 mg / L, suspended solids ≤ 30 mg / L, and heavy metal ions are not detected, it is classified as clean; if the turbidity is > 50 NTU, Fe 3+ If the concentration is greater than 5 mg / L, it is classified as suspended matter pollution type; if the pH is less than 5.5 and the SO42- concentration is greater than 1000 mg / L, it is classified as acidic pollution type; if the TDS is greater than 3000 mg / L and the heavy metal ion content exceeds the standard, it is classified as high mineralization type.

4. The method according to claim 3, characterized in that In step 2, the drainage branch pipeline is constructed as follows: the drainage branch pipe is laid along the side end of the tunnel. When the drainage branch pipe outlet is in a positive height difference with the secondary water storage space, the flexibility of the Type II heat-resistant polyethylene pipe is naturally laid along the slope of the tunnel to realize gravity self-flow transportation; when it is a reverse height difference, a pumping device is configured from the end of the drainage branch pipe to complete the reverse classification and transportation of the differentiated mine water through pressure coordination, forming a graded pipe network closed-loop system with drainage and water supply pressure linkage.

5. The method according to claim 4, characterized in that In step 3, the porosity of the porous structure is 30% to 45%, and the specific surface area is ≥ 200m 2 / g; The neutral range refers to a pH range of 6.5 to 8.

5.

6. The method according to claim 5, characterized in that In step 3, the water-binder ratio of the water purification material is in the range of 0.42 to 0.45, and the water-binder ratio decreases as the content of suspended solids in the mine water increases; The alkaline activator of the water purification material is compounded by sodium hydroxide and sodium silicate in the form of Na2O·nSiO2, wherein the alkaline activator modulus n is 1.0-1.

5. For acidic mine water or high-mineralization mine water in which the concentration of divalent heavy metal ions accounts for more than 60% of the total heavy metal ion concentration, the alkaline activator modulus n is 1.0-1.2; for high-mineralization mine water in which the concentration of trivalent heavy metal ions accounts for more than 60% of the total heavy metal ion concentration, the alkaline activator modulus n is 1.3-1.

5.

7. The method according to claim 6, characterized in that In step 4, the clean mine water source is less polluted. The clean mine water is discharged into the closed goaf. After the goaf is self-purified and filtered, the water is lifted to the surface by a lifting pump to be treated in a purification plant to meet the Class III standard of the "Groundwater Quality Standard"; Electrodialysis treatment of suspended matter-contaminated mine water and acid-contaminated mine water has reached Class IV standards of the Groundwater Quality Standards; The heavy metal ion content in highly mineralized mine water exceeds the standard, and underground purification and utilization are implemented. After deep treatment, it must meet Class V standards of the "Groundwater Quality Standards".

8. The method according to claim 7, characterized in that Step 5 includes: allocating the mine water use areas corresponding to the mining area water use according to the water use allocation model: The objective function for maximizing the economic benefits of regional water supply is: Where f1(x) is the objective function for maximizing the economic benefits of regional water supply, x is the decision variable vector, K is the total number of regions, J(k) is the total number of users in the kth region, and I(k) is the total number of independent water sources in the kth region; are the water supply from independent water source i to user j in sub-area k, and the water supply from public water source c to user j in sub-area k; are the benefit coefficients of independent water source i supplying water to user j in sub-area k, and the benefit coefficients of public water source c supplying water to user j in sub-area k; are the cost coefficients of water supply from independent water source i to user j in sub-area k, and the cost coefficients of water supply from public water source c to user j in sub-area k; are the water supply order coefficient of the independent water source i and the water supply order coefficient of the public water source c in the k sub-area respectively; is the water use equity coefficient of user j in sub-area k; ω k is the weight coefficient of k sub-area; Environmental benefits refer to the minimum emission of important regional pollutants, which is expressed as the minimum emission of chemical oxygen demand (COD). The maximum environmental benefit objective function f2(x) for regional water supply is: in is the concentration of important pollutants in the wastewater discharged by user j in sub-area k; is the wastewater discharge coefficient of user j in sub-area k; The objective function f3(x) for maximizing the social benefit of regional water supply is: in is the water demand of user j in sub-area k, and M is the number of public water sources; Establish water supply capacity constraints for regional water supply systems, including: Public water sources: in is the maximum water delivery capacity of public water source c to region k, W C is the total water supply capacity of the public water source c, are the relevant parameters of water sources in region k; Independent water source: Constraints on water source delivery capacity: in is the maximum water delivery capacity of water source i in sub-area k, Q c is the maximum water delivery capacity of the public water source c; The objective function and constraints are combined to form the overall model for optimal allocation of water resources: F(X)=opt{f1(x),f2(x),f3(x)}, Where F(X) is the overall objective function of water resources optimization allocation, and opt represents the optimization operator.

9. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the memory stores program codes, and when the program codes are executed by the processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 8.

10. A storage medium, characterized in that: A computer program or instruction is stored, and when the computer program or instruction is run on a computer, the steps of the method according to any one of claims 1 to 8 are executed.

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