Mine water resource multi-source regulation and control configuration and comprehensive environment-friendly utilization method

Abstract

The invention discloses a mine water resource multi-source regulation and control configuration and comprehensive environment-friendly utilization method, and relates to the source and utilization of mine ground domestic water, the source and utilization of coal cleaning plant water, the source and utilization of underground production water and the energy-saving utilization of mine production waste heat. According to the method, underground sewage is treated for underground production, ground sewage is treated for a coal cleaning plant, domestic water is supplemented by mine gushing water, sewage is recycled, and self-circulation is formed; and multi-source comprehensive utilization, energy conservation and environmental protection of mine water resources in the water-deficient mining area are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to a mine water resource utilization method, in particular to a mine water resource multi-source regulation and configuration and comprehensive environmental protection utilization method. BACKGROUND

[0002] Some existing mines belong to water resource deficient mines. Due to the special geographical environment, the water supply is unreliable and far from meeting the needs of workers' bath and life water and underground production water. In addition, ground domestic sewage and underground water discharge have become a problem restricting green coal development.

[0003] At present, there are various existing mine water resource utilization methods, such as clean mine water treatment, mine water treatment containing suspended solids, high salinity mine water treatment, acid mine water treatment, and special component mine water treatment. However, these methods have limitations for some western mines and cannot meet the "coal-water-heat" co-mining paradigm in western mining areas. A complete technical solution is needed to realize green coal mining. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present disclosure is to provide a mine water resource multi-source regulation and configuration and comprehensive environmental protection utilization method, which solves the technical problems described in the background art.

[0005] The purpose of the present disclosure can be achieved by the following technical solutions: A mine water resource multi-source regulation and configuration and comprehensive environmental protection utilization method, the water deficient mine area mine water resource includes mine surrounding water source well, main inclined shaft water inflow, normal underground water inflow and underground production wastewater, including the following steps: The mine surrounding water source well and the main inclined shaft water inflow are transported to the ground life intermediate water pool, the water source in the ground life intermediate water pool is treated by the ground life water treatment system and then enters the life high water pool, and the water source in the life high water pool is used for mine life water; The total sewage in the mine life is transported to the ground domestic sewage treatment system, the ground domestic sewage treatment system is used for treating the transported mine life wastewater to generate coal washery water, the coal washery water is used as the water supply of the coal washery, and the water supply of the coal washery is used for daily production of the coal washery; The coal washery wastewater generated by the coal washery is transported to the ground domestic sewage treatment system for treatment to regenerate the coal washery water; The normal underground water inflow and the underground production wastewater enter the underground sewage treatment system for treatment and are injected into the fire fighting production water pool, and the water source in the fire fighting production water pool is used for normal underground production.

[0006] Further, the water source in the fire fighting production water pool is used for normal underground production, including: The water source in the fire-fighting production water pool enters the mining face through the underground production water pipeline to supply water to the working face; The water source in the fire-fighting production water pool is injected into the high-level domestic water pool after passing through the mine water deep treatment system, and is used for domestic water use throughout the mine.

[0007] Furthermore, the total wastewater includes domestic wastewater from the entire mine, wastewater from the joint building, wastewater from the apartment building, and wastewater from the canteen.

[0008] Furthermore, the surface domestic water treatment system includes: The water source in the ground-level domestic water transfer tank undergoes mechanical filtration, precision filtration, reverse osmosis, and desalination treatment in sequence to meet the drinking water hygiene standards. The water source that meets the drinking water hygiene standards is then pressurized and pumped into the elevated domestic water tank.

[0009] Furthermore, a neutralizing agent is added to the water source that meets the drinking water hygiene standards, so that the water source meets the pH value requirements.

[0010] Furthermore, the surface domestic sewage treatment system includes: The first stage is pretreatment, where all the mine's domestic wastewater first passes through a coarse screen to remove large floating objects such as plastic bags, branches, and strips of cloth. Then, the water passes through a fine screen to intercept smaller suspended solids such as hair, fibers, and food residue. It then enters a grit chamber to slow down the water flow and allow denser inorganic particles to settle. Finally, the water is adjusted and directed into a regulating tank to collect and mix water from different periods, so that the outflow and water quality are relatively stable, which is convenient for subsequent biological treatment. The second stage is biological treatment, which is completed through the A² / O process or oxidation ditch process to reduce BOD, COD and ammonia nitrogen in the water source of the equalization tank. The third stage is advanced treatment and disinfection. The biochemically treated water is then filtered and introduced into a clear water tank to complete the sewage treatment. The treated sewage is then used as water supply for the coal washing plant.

[0011] Furthermore, the surface domestic sewage treatment system includes: an oil skimmer or grease trap installed on the surface of the pool to remove grease floating on the water surface.

[0012] Furthermore, the underground wastewater treatment system includes: Normal underground water inflow and underground production wastewater enter the coagulation reactor, where magnetic powder, coagulant, and flocculant are added in sequence to form magnetic flocs with high density and extremely fast settling speed. The water carrying the magnetic flocs enters the super magnetic separator to complete solid-liquid separation, forming clear water that flows out from the top of the equipment and is injected into the fire-fighting production water tank.

[0013] Furthermore, the mine water deep treatment system includes: In the first stage, the water source in the fire-fighting production water tank is pretreated by passing through a multi-stage security filter and an advanced oxidation process. The second stage is desalination and purification. A high-pressure pump forces the pre-treated water from the first stage through a reverse osmosis membrane to remove almost all dissolved salts, ions, viruses, bacteria, and organic molecules. The third stage is post-treatment and water quality stabilization. The water treated in the second stage is passed through a filter containing calcium carbonate and maifan stone filter media. Before finally entering the domestic high-level water tank, the water flows through an ultraviolet sterilizer for ultraviolet disinfection. At the inlet of the domestic high-level water tank, a trace amount of chloramine is added to ensure that the water supply remains sterile throughout the entire transportation process.

[0014] The beneficial effects of this invention are: This application involves treating underground wastewater for use in underground production, and treating surface wastewater for use in coal washing plants, forming a self-circulating system that achieves comprehensive utilization of water resources, reduces water intake costs, and minimizes wastewater discharge. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] Figure 1 A schematic diagram of surface domestic water supply in a coal mine; Figure 2 A schematic diagram showing water usage in a coal mine coal washing plant; Figure 3 This is a schematic diagram of water used in underground coal mine production. Detailed Implementation

[0018] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0019] This application discloses a method for multi-source regulation and comprehensive environmental utilization of mine water resources. The mine water resources in the water-scarce mining area include water source wells around the mine, water inflow from the main inclined shaft, normal underground water inflow, and underground production wastewater. The method includes the following steps: water source wells around the mine and water inflow from the main inclined shaft are transported to a surface domestic water transfer tank. The water in the surface domestic water transfer tank is treated by a surface domestic water treatment system and then enters a high-level domestic water tank. The water in the high-level domestic water tank is used for domestic water use throughout the mine. The total domestic wastewater from the entire mine is transported to a surface domestic wastewater treatment system. The surface domestic wastewater treatment system is used to treat the transported domestic wastewater from the entire mine to generate coal washing plant water. The coal washing plant water is used as the water supply for the coal washing plant, and the coal washing plant water supply is used for daily production. The coal washing plant wastewater generated is transported to the surface domestic wastewater treatment system for treatment to regenerate coal washing plant water. The normal underground water inflow and underground production wastewater are treated by the underground wastewater treatment system and then injected into a fire-fighting production water tank. The water in the fire-fighting production water tank is used for normal underground production.

[0020] Specifically, such as Figure 1 As shown, surface domestic water is supplied bidirectionally by water source wells around the mine and water inflow from the main inclined shaft, complementing each other before entering the surface domestic water transfer pool. The water source passes through the surface domestic water treatment system into the high-level domestic water pool, and then supplies domestic water to the entire mine. The generated domestic wastewater from the entire mine enters the surface domestic sewage treatment system. Furthermore, water from the water source wells around the mine and water inflow from the main inclined shaft is directly transported to the surface domestic water transfer pool, which reduces exploration, construction of water source wells, and land acquisition costs, and avoids the costs of underground water treatment and drainage caused by water flowing from the outlet point into the mine.

[0021] like Figure 2 As shown, the wastewater generated from the mine's domestic water use and the wastewater generated from the coal washing plant constitute the mine's domestic wastewater. The mine's domestic wastewater, sewage from the joint building, sewage from the apartment building, and sewage from the canteen constitute the mine's total sewage. The total sewage enters the surface domestic sewage treatment system, and after passing through the surface domestic sewage treatment system, it is used to supply water to the coal washing plant, thus forming a cycle.

[0022] like Figure 3 As shown, normal underground water inflow and underground production wastewater enter the underground sewage treatment plant. After passing through the underground sewage treatment system, the water enters the central pump room and is injected into the fire-fighting production water tank. The water in the tank is used for normal underground production. The water source enters the mining face through the underground production water pipeline to supply water to the working face. The water in the tank can also be injected into the elevated domestic water tank through the mine water deep treatment system to supplement the surface domestic water supply. In this way, surface wastewater is treated to supply the coal washing plant, and underground wastewater is treated to supply underground production use without interference, reducing water transportation costs.

[0023] In practice, the specific operating steps are as follows: (1) Surface domestic water treatment system: The deep treatment process of "mechanical filtration, precision filtration, reverse osmosis and post-treatment" is adopted to remove various impurities in the water to meet the requirements of domestic water. First, for the large amount of suspended solids, coal dust, impurities and colloids in mine water, the method of mechanical filtration + precision filtration can be adopted. Mechanical filtration can be biological activated carbon filter to achieve physical adsorption and biodegradation. Precision filtration can be multi-stage precision security filtration to remove any small particulate matter that may be generated in the previous process. Secondly, most of the inorganic salts, organic matter, microorganisms, and bacteria in the water source can be treated by reverse osmosis membrane. A high-pressure pump forces the water through the reverse osmosis membrane to produce very pure "RO permeate water" that meets the hygiene standards for drinking water. Finally, post-treatment is carried out to dissolve appropriate amounts of beneficial minerals such as calcium and magnesium, adjust the pH value of the water from slightly acidic to neutral or slightly alkaline, and increase the total alkalinity of the water to make the water quality more stable. The treated water is then pressurized and pumped into the domestic high-level water tank. (2) Surface domestic sewage treatment system: It is divided into three stages. The first stage is pretreatment, which is screen + grit removal + regulation. The purpose is to remove large debris and sand particles from the sewage, equalize the water quality and quantity, and protect the subsequent treatment units. First, for large floating objects such as plastic bags, branches, and strips of cloth and smaller suspended solids such as hair, fibers, and food scraps in the mine's domestic sewage, coarse screen + fine screen filtration can be used to remove suspended impurities from the water source. Second, the water source passes through a grit removal tank. The purpose of the grit removal tank is to reduce the water flow velocity and allow denser inorganic particles (such as sand, coal dust, etc.) to settle. Finally, the water source is regulated by a regulation tank + grease trap. In view of the large fluctuations in the water volume and quality of mine domestic sewage (such as during concentrated meal times), the regulation tank is used to collect and mix the water from different times to make the outflow volume and water quality relatively stable, which is convenient for subsequent biological treatment. For grease floating on the water surface, a grease trap is usually installed on the surface of the tank for removal. The second stage is core biological treatment, aimed at reducing organic pollutants such as BOD, COD, and ammonia nitrogen in the water source. This is achieved through either the A² / O process or oxidation ditch process, focusing on the efficient removal of BOD and COD and nitrification.

[0024] The third stage is deep treatment and disinfection, which aims to further reduce suspended solids and turbidity to ensure that the effluent meets the requirements for coal washing water. It targets the residual suspended solids in the water to make the effluent clear and transparent, reducing SS to below 30mg / L. Deep filtration is carried out through a secondary sedimentation tank, which can be a V-shaped filter to remove fine suspended solids from the water source.

[0025] (3) Underground sewage treatment system: For underground sewage with high suspended solids (coal powder, rock powder), the super magnetic separation water purification system is used for treatment, which is divided into coagulation reactor + super magnetic separator + magnetic powder recovery system; First, wastewater is injected into a compact tubular coagulation reactor, where magnetic powder, coagulant, and flocculant are added sequentially to form high-density magnetic flocs with extremely fast settling speed. Second, the water carrying the magnetic flocs enters a super magnetic separator, where the high-intensity magnetic field inside the equipment instantly adsorbs and captures all the magnetic flocs, while the clear water flows out from the top of the equipment, achieving rapid solid-liquid separation and reducing the effluent SS to below 20 mg / L. Finally, the mixture enters a magnetic powder recovery machine, where hydraulic flushing separates the magnetic powder from the sludge. The separated magnetic powder is recycled, aiming to recover and reuse the magnetic powder, thereby reducing operating costs.

[0026] (4) Mine water deep treatment system: For water sources that may contain deeper pollutants such as dissolved solids, trace organic matter, heavy metals, and nitrates, the system can be treated by pretreatment enhancement + core desalination and purification + post-treatment and water quality stabilization. The purpose is to further treat the treated underground sewage to the drinking water standard and meet the national "Standards for Drinking Water Quality". First, the water source is pretreated and enhanced by multi-stage security filtration and advanced oxidation processes. The purpose is to remove any fine particulate matter that may remain in the water and decompose large organic molecules, improve the smell and taste of the water, and improve its biodegradability. Second, the water source is desalinated and purified in the core. The purpose is to remove dissolved pollutants and retain dissolved salts, ions (including heavy metals), viruses, bacteria, and organic molecules to produce "RO permeate water" that is almost pure water. Finally, post-treatment and water quality stabilization are carried out to dissolve appropriate amounts of minerals such as calcium and magnesium and bicarbonate, adjust the pH value of the water, and improve the taste and health. This can be done by mineralization filters and ultraviolet disinfection.

[0027] Meanwhile, in order to meet the requirements of comprehensive environmental protection utilization in the mine, water is supplied to the hot water tank of the bath through three hot water sources: waste heat utilization of the air compressor, air source and heat exchange. The three heating methods serve as backups for each other, which can not only meet the requirements of environmental protection and energy saving, but also save costs.

[0028] In summary, the embodiments of the present invention have the following beneficial effects: The comprehensive utilization of water resources has saved costs and effectively alleviated the water shortage in the mining area. The water supply for employees' bathing and daily life is sufficient, which has improved the happiness of the mining employees and ensured the safe production of the mine.

[0029] By comprehensively utilizing water resources in coal mines, water resources can be fully utilized, pollutant emissions can be reduced, and the conflict between production and the environment can be alleviated.

[0030] In this description, the terms "an embodiment," "example," "specific example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this disclosure. Those skilled in the art should understand that this disclosure is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this disclosure. Various changes and modifications can be made to this disclosure without departing from its spirit and scope, and all such changes and modifications fall within the scope of this disclosure as claimed.

Claims

1. A method for multi-source regulation and comprehensive environmental utilization of mine water resources, wherein the mine water resources in the water-scarce mining area include water source wells around the mine, water inflow from the main inclined shaft, normal underground water inflow, and underground production wastewater, characterized in that, Includes the following steps: Water from the surrounding water wells and the main inclined shaft is transported to the surface domestic water transfer pool. The water in the surface domestic water transfer pool is treated by the surface domestic water treatment system and then enters the high-level domestic water pool. The water in the high-level domestic water pool is used for domestic water use throughout the mine. All domestic wastewater from the mine is transported to the surface domestic wastewater treatment system. The surface domestic wastewater treatment system is used to treat the transported domestic wastewater from the mine to generate coal washing plant water. The coal washing plant water is used as the water supply for the coal washing plant and is used for the daily production of the coal washing plant. The wastewater generated by the coal washing plant is transported to the surface domestic sewage treatment system for treatment, and is regenerated into coal washing plant water. Normal underground water inflow and underground production wastewater are treated in the underground sewage treatment system and then injected into the fire-fighting production water tank. The water in the fire-fighting production water tank is used for normal underground production.

2. The method for multi-source regulation and configuration and comprehensive environmental protection utilization of mine water resources according to claim 1, characterized in that, The water source in the fire-fighting production water tank is used for normal underground production, including: The water source in the fire-fighting production water pool enters the mining face through the underground production water pipeline to supply water to the working face; The water source in the fire-fighting production water pool is injected into the high-level domestic water pool after passing through the mine water deep treatment system, and is used for domestic water use throughout the mine.

3. The method for multi-source regulation and configuration and comprehensive environmental protection utilization of mine water resources according to claim 1, characterized in that, The total wastewater includes domestic wastewater from the entire mine, wastewater from the joint building, wastewater from the apartment building, and wastewater from the canteen.

4. The method for multi-source regulation and configuration and comprehensive environmental protection utilization of mine water resources according to claim 1, characterized in that, Surface domestic water treatment system, including: The water source in the ground-level domestic water transfer tank undergoes mechanical filtration, precision filtration, reverse osmosis, and desalination treatment in sequence to meet the drinking water hygiene standards. The water source that meets the drinking water hygiene standards is then pressurized and pumped into the elevated domestic water tank.

5. The method for multi-source regulation and configuration and comprehensive environmental protection utilization of mine water resources according to claim 4, characterized in that, The addition of a neutralizing agent to the water source that meets the drinking water hygiene standards ensures that the water source meets the pH requirements.

6. The method for multi-source regulation and configuration and comprehensive environmental protection utilization of mine water resources according to claim 1, characterized in that, Surface domestic sewage treatment system, including: The first stage is pretreatment, where all the mine's domestic wastewater first passes through a coarse screen to remove large floating objects such as plastic bags, branches, and strips of cloth. Then, the water passes through a fine screen to intercept smaller suspended solids such as hair, fibers, and food residue. It then enters a grit chamber to slow down the water flow and allow denser inorganic particles to settle. Finally, the water is adjusted and directed into a regulating tank to collect and mix water from different periods, so that the outflow and water quality are relatively stable, which is convenient for subsequent biological treatment. The second stage is biological treatment, which is completed through the A² / O process or oxidation ditch process to reduce BOD, COD and ammonia nitrogen in the water source of the equalization tank. The third stage is advanced treatment and disinfection. The biochemically treated water is then filtered and introduced into a clear water tank to complete the sewage treatment. The treated sewage is then used as water supply for the coal washing plant.

7. The method for multi-source regulation and configuration and comprehensive environmental protection utilization of mine water resources according to claim 6, characterized in that, The surface domestic sewage treatment system includes: an oil skimmer or grease trap installed on the surface of the pool to remove grease floating on the water.

8. The method for multi-source regulation and configuration and comprehensive environmental protection utilization of mine water resources according to claim 1, characterized in that, The underground wastewater treatment system includes: Normal underground water inflow and underground production wastewater enter the coagulation reactor, where magnetic powder, coagulant, and flocculant are added in sequence to form magnetic flocs with high density and extremely fast settling speed. The water carrying the magnetic flocs enters the super magnetic separator to complete solid-liquid separation, forming clear water that flows out from the top of the equipment and is injected into the fire-fighting production water tank.

9. The method for multi-source regulation and configuration and comprehensive environmental protection utilization of mine water resources according to claim 2, characterized in that, Mine water deep treatment system includes: In the first stage, the water source in the fire-fighting production water tank is pretreated by passing through a multi-stage security filter and an advanced oxidation process. The second stage is desalination and purification. A high-pressure pump forces the pre-treated water from the first stage through a reverse osmosis membrane to remove almost all dissolved salts, ions, viruses, bacteria, and organic molecules. The third stage is post-treatment and water quality stabilization. The water treated in the second stage is passed through a filter containing calcium carbonate and maifan stone filter media. Before finally entering the domestic high-level water tank, the water flows through an ultraviolet sterilizer for ultraviolet disinfection. At the inlet of the domestic high-level water tank, a trace amount of chloramine is added to ensure that the water supply remains sterile throughout the entire transportation process.

10. The method for multi-source regulation and configuration and comprehensive environmental protection utilization of mine water resources according to claim 1, characterized in that, It also includes replenishing the hot water tank of the bathhouse with three hot water sources: waste heat utilization from the air compressor, air source heat pump, and heat exchanger. The three hot water supply methods serve as backups for each other.

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