Deep treatment equipment for drainage water in underground coal mine

Abstract

The invention discloses deep treatment equipment for underground drainage water of a coal mine. The deep treatment equipment comprises an adjusting precipitation unit, a filtering unit, a deep treatment unit, a recycled water supply unit and a wastewater pool, the regulating and precipitating unit is used for draining small-particle precipitates in water, the filtering unit is used for receiving the drained water discharged by the regulating and precipitating unit and filtering the drained water, and the deep treatment unit is used for performing deep treatment on the drained water treated by the filtering unit and discharging the treated drained water into the recycling water supply unit. Use is performed according to different requirements; the wastewater pool is used for collecting and adjusting waste discharged by the sedimentation unit, the filtering unit and the advanced treatment unit. The problems that existing equipment is high in investment cost, large in occupied area, unstable in water quality treatment effect and difficult to achieve the purpose of comprehensive utilization are solved.

Description

Technical Field

[0001] This invention belongs to the technical field of underground coal mine production equipment, specifically relating to deep treatment equipment for underground coal mine drainage water. Background Technology

[0002] As coal mine production scale and output continue to increase, the discharge of underground drainage water also continues to rise. Drainage water is the coal seam water that flows in during the coal mining process. The treatment and reuse of underground drainage water has become one of the key issues affecting the normal production of coal enterprises.

[0003] The main pollutants in underground drainage water are coal dust and rock dust from the coal mining process, which have a high suspended solids (SS) content. At the same time, the drainage water has a high salt content, high concentration of metal ions, and also contains a certain amount of machine oil and emulsified oil. The composition of pollutants in the water is complex, and direct and disorderly discharge will lead to water waste and environmental pollution.

[0004] Current methods for deep treatment of underground coal mine drainage water mainly involve coagulation, gravity sedimentation, and filtration before discharge or reuse. In practice, these methods are costly, require large equipment footprints, and exhibit inconsistent water treatment results, making comprehensive utilization difficult. Actual cases of on-site utilization underground are rare. Therefore, seeking advanced and economically feasible processes and technologies has become an urgent need to ensure the normal production and operation of coal mines. Summary of the Invention

[0005] The purpose of this invention is to provide a deep treatment device for underground drainage water in coal mines, which solves the problems of high investment costs, large equipment footprint, unstable water treatment effect, and difficulty in achieving comprehensive utilization of existing equipment.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a deep treatment device for underground coal mine drainage water, comprising a regulating sedimentation unit, a filtration unit, a deep treatment unit, a reuse water supply unit, and a wastewater tank; the regulating sedimentation unit is used for the sedimentation of small particles in the drainage water; the filtration unit receives the drainage water discharged from the regulating sedimentation unit and filters it; the deep treatment unit further treats the drainage water after filtration and discharges the treated drainage water into the reuse water supply unit for use according to different needs; the wastewater tank is used to collect waste discharged from the regulating sedimentation unit, the filtration unit, and the deep treatment unit.

[0007] As a preferred technical solution of the present invention, the regulating sedimentation unit comprises, in sequence, a raw water lift pump, a jet aeration device, an inclined plate purification chamber, and a pre-sedimentation product water tank; the inclined plate purification chamber includes a flocculation mixing zone and an inclined plate sedimentation zone, wherein a flocculation agitator and a flocculation dosing device are provided in the flocculation mixing zone, and the flocculation mixing zone is connected to the inclined plate sedimentation zone through holes; a sludge hopper is provided at the bottom of the inclined plate sedimentation zone, and the sludge hopper is connected to the wastewater tank through a sludge pipeline.

[0008] As a preferred embodiment of the present invention, the number of mud buckets is multiple.

[0009] As a preferred embodiment of the present invention, the filtration unit comprises a filtration booster pump, a self-cleaning filter, a multi-media filter, an activated carbon filter, and a filtration product water tank connected in sequence; the self-cleaning filter, the multi-media filter, and the activated carbon filter are all connected to the wastewater tank through sludge pipelines.

[0010] As a preferred embodiment of the present invention, the filtration unit further includes a backwash pump, and the filtered water tank is connected to a multi-media filter and an activated carbon filter respectively through the backwash pump.

[0011] As a preferred technical solution of the present invention, the deep treatment unit includes a reverse osmosis water supply pump, a security filter, a main booster pump and a reverse osmosis membrane module connected in sequence. The reverse osmosis membrane module is equipped with a dosing device and is connected to the wastewater tank through a sludge pipeline.

[0012] As a preferred embodiment of the present invention, the reuse water supply unit includes a downhole fire sprinkler pump, a reverse osmosis permeate booster pump, a reverse osmosis concentrate booster pump, a reverse osmosis permeate tank, and a reverse osmosis concentrate pool. The inlet of the reverse osmosis permeate tank is connected to the permeate end of the reverse osmosis membrane module, and the outlet of the reverse osmosis permeate tank is connected to the reverse osmosis permeate booster pump. The permeate is used for production water supply both above and below ground. The inlet of the reverse osmosis concentrate pool is connected to the concentrate end of the reverse osmosis membrane module, and the outlet is connected to the reverse osmosis concentrate booster pump. The concentrate is transported to structures such as surface power plants for comprehensive utilization. The measuring instruments at the top of the reverse osmosis permeate tank and concentrate pool are ultrasonic level gauges.

[0013] As a preferred technical solution of the present invention, an ultrasonic level gauge is provided on the top of the pre-sedimentation product water tank, the filter product water tank, and the reverse osmosis product water tank.

[0014] The beneficial effects of this invention are as follows: After being treated by the deep treatment equipment for underground coal mine drainage water according to this invention, the drainage water is supplied to various water usage points in the mine through a reuse water supply unit. The reuse water supply unit mainly includes an underground fire sprinkler pump, a reverse osmosis product water tank, a reverse osmosis concentrate tank, a reverse osmosis product water lift pump, and a concentrated brine lift pump. This invention has a small footprint, high system efficiency, and stable water quality after treatment. The treated drainage water meets the needs of both underground and surface production, improving the utilization rate of drainage water in coal mines. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of a deep treatment device for underground drainage water in coal mines according to the present invention; Figure 2 This is a schematic diagram of a deep treatment device for underground drainage water in coal mines according to the present invention.

[0016] In the diagram: 1. Raw water lift pump, 2. Jet aeration device, 3. Mixing flocculation tank, 4. Flocculation mixer, 5. Inclined tube water purification device, 6. Inclined tube, 7. Sludge hopper, 8. Measuring instrument, 9. Pre-sedimentation product water tank, 10. Filtration lift pump, 11. Self-cleaning filter, 12. Multi-media filter, 13. Activated carbon filter, 14. Filtration product water tank, 15. Filtration backwash pump, 16. Reverse osmosis water supply pump, 17. Security filter, 18. Main unit booster pump, 19. Reverse osmosis membrane module, 20. Reverse osmosis product water tank, 21. Reverse osmosis concentrate tank, 22. Electric valve, 23. Wastewater tank, 24. Downhole fire sprinkler pump, 25. Reverse osmosis product water lift pump, 26. Reverse osmosis concentrate lift pump, 27. Wastewater lift pump. Detailed Implementation

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Example 1 like Figure 1 As shown, the present invention provides a deep treatment device for underground coal mine drainage water, comprising a regulating sedimentation unit, a filtration unit, a deep treatment unit, a reuse water supply unit, and a wastewater tank 23. The regulating sedimentation unit is used for sedimentation of small particles in the drainage water. The filtration unit receives the drainage water discharged from the regulating sedimentation unit and filters it. The deep treatment unit further treats the drainage water after filtration and discharges the treated drainage water into the reuse water supply unit for use according to different needs. The wastewater tank 23 is used to collect waste discharged from the regulating sedimentation unit, the filtration unit, and the deep treatment unit. The water in the wastewater tank 23, after sedimentation, is transported to the goaf area by a wastewater lift pump 27.

[0019] Example 2 Similar to Example 1, Example 2 of the coal mine underground drainage water deep treatment equipment of the present invention also includes a regulating sedimentation unit, a filtration unit, a deep treatment unit, a reuse water supply unit, and a wastewater tank 23; the regulating sedimentation unit is used for the sedimentation of small particles in the drainage water; the filtration unit receives the drainage water discharged from the regulating sedimentation unit and filters it; the deep treatment unit performs deep treatment on the drainage water after the filtration unit and discharges the treated drainage water into the reuse water supply unit for use according to different needs; the wastewater tank 23 is used to collect the waste discharged from the regulating sedimentation unit, the filtration unit, and the deep treatment unit; the water in the wastewater tank 23 is transported to the goaf area through the wastewater lift pump 27 after sedimentation.

[0020] Unlike Example 1, in Example 2 of the deep treatment equipment for underground coal mine drainage water of the present invention, the regulating sedimentation unit includes, in sequence, a raw water lift pump 1, a jet aeration device 2, an inclined plate purification chamber 5, and a pre-sedimentation product water tank 9; the inclined plate purification chamber 5 includes a flocculation mixing zone and an inclined plate sedimentation zone, the flocculation mixing zone is equipped with a flocculation agitator 4 and a flocculation dosing device, and the flocculation mixing zone is connected to the inclined plate sedimentation zone through holes; a sludge hopper 7 is provided at the bottom of the inclined plate sedimentation zone, and the sludge hopper 7 is connected to the wastewater pool 23 through a sludge pipeline.

[0021] Raw water lift pump 1 lifts the drained water from the water tank to the inclined plate water purification device 5. A flow meter 28 is connected to the outlet of the water tank. Jet aeration device 2 draws air into the water through high-speed jets of water, increasing dissolved oxygen and improving water treatment efficiency. The inclined plate water purification device 5 has a single-unit water treatment capacity of 200 m³. 3 At a rate of / h, flocculant is added via a dosing device. Raw water enters the mixing flocculation tank, where it is stirred by the flocculation mixer 4, and then enters the inclined plate sedimentation zone for sedimentation. The clear water from the sedimentation zone of the inclined plate water purification device 5 is discharged by gravity through an overflow weir. Sludge from the sedimentation zone enters the sludge hopper 7 and is then pumped into the wastewater tank 23. An oil skimming device is installed on the upper part of the inclined plate water purification device 5 to remove surface oil. The product water from the inclined plate water purification device 5 enters the pre-sedimentation product water tank 9, which is made of steel.

[0022] like Figure 2 As shown, the drain water from the goaf inflow sump is pumped to the inclined tube purification device 5 via the raw water lift pump 1, while the dissolved oxygen in the raw water is increased by the jet aeration device 2. When the turbidity of the incoming water is greater than 5 NTU, coagulant is added to the mixing flocculation tank 3; when the turbidity is less than 5 NTU, no further addition is made. The suspended small particles in the raw water are converted into larger particles through flocculation reaction. After sedimentation, the suspended solids in the raw water are removed, and the effluent is stored in the pre-sedimentation product water tank 9.

[0023] Example 3 like Figure 1As shown in Example 2, the coal mine underground drainage water deep treatment equipment of the present invention in Example 3 also includes a regulating sedimentation unit, a filtration unit, a deep treatment unit, a reuse water supply unit, and a wastewater tank 23. The regulating sedimentation unit is used for the sedimentation of small particles in the drainage water. The filtration unit receives the drainage water discharged from the regulating sedimentation unit and filters it. The deep treatment unit performs deep treatment on the drainage water after the filtration unit and discharges the treated drainage water into the reuse water supply unit for use according to different needs. The wastewater tank 23 is used to collect the waste discharged from the regulating sedimentation unit, the filtration unit, and the deep treatment unit. The water in the wastewater tank 23 is transported to the goaf area through the wastewater lift pump 27 after sedimentation. The regulating sedimentation unit includes, in sequence, a raw water lift pump 1, a jet aeration device 2, an inclined plate purification chamber 5, and a pre-sedimentation product water tank 9; the inclined plate purification chamber 5 includes a flocculation mixing zone and an inclined plate sedimentation zone, the flocculation mixing zone is equipped with a flocculation agitator 4 and a flocculation dosing device, and the flocculation mixing zone is connected to the inclined plate sedimentation zone through holes; a sludge hopper 7 is installed at the bottom of the inclined plate sedimentation zone, and the sludge hopper 7 is connected to the wastewater tank 23 through a sludge pipeline.

[0024] Unlike Example 2, in Example 3 of the coal mine underground drainage water deep treatment equipment of the present invention: the filter unit includes a filter lift pump 10, a self-cleaning filter 11, a multi-media filter 12, an activated carbon filter 13 and a filter product water tank 14 connected in sequence; the self-cleaning filter 11, the multi-media filter 12 and the activated carbon filter 13 are all connected to the wastewater tank 23 through sludge pipelines.

[0025] The filter booster pump 10 is used to lift water from the pre-settling product water tank 9 to the self-cleaning filter 11. The pump inlet and outlet are equipped with electric valves and pressure sensors, which are linked to the water level in the pre-settling product water tank 9 for automatic pump stop when the tank level reaches a low level. The product water from the pre-settling tank 9 enters the self-cleaning filter 11. The self-cleaning filter 11 uses a filter screen to intercept impurities in the water, purifying the water and protecting the normal operation of downstream devices. The self-cleaning filter 11 can automatically identify the degree of impurity deposition and send a signal to the discharge electric valve 22 for automatic discharge. The sludge discharged from the self-cleaning filter 11 enters the wastewater pool 23. The multi-media filter 12 uses quartz sand and anthracite as filter media. The gaps in the filter media screen pollutants, removing fine particles and suspended solids from the water. The multi-media filter 12 adopts a cylindrical structure with an elliptical head, an inlet device at the top, and a collection device at the bottom. During operation, water enters from the top, flows through the filter layer, and flows out from the bottom. The activated carbon filter 13 adopts a vertical cylindrical structure, including inlet and outlet valves, and a drain valve. It is equipped with accessories such as a backwash sight glass, inspection port, pressure gauge, and support legs. The activated carbon filter 13 can control the opening of the inlet and outlet valves according to the pressure difference between the inlet and outlet water, achieving fully automatic backwashing. The filter product water tank 14 is made of steel and includes matching pipes, valves, and fittings. The filter product water tank 14 collects the effluent from the activated carbon filter, and a portion of the product water is used as a water source for filter backwashing and underground fire sprinkler systems.

[0026] like Figure 2 As shown, the drain water from the goaf inflow sump is pumped to the inclined tube purification device 5 via the raw water lift pump 1, while the dissolved oxygen in the raw water is increased by the jet aeration device 2. When the turbidity of the incoming water is greater than 5 NTU, coagulant is added to the mixing flocculation tank 3; when the turbidity is less than 5 NTU, no further addition is made. The suspended small particles in the raw water are converted into larger particles through flocculation reaction. After sedimentation, the suspended solids in the raw water are removed, and the effluent is stored in the pre-sedimentation product water tank 9.

[0027] The permeate from the pre-sedimentation tank 9 is pumped by the filter booster pump 10 to the self-cleaning filter 11, where large particles larger than 100μm are removed. The permeate from the self-cleaning filter 11 then enters the multi-media filter 12 and the activated carbon filter 13 for further removal of turbidity and organic matter. The filtered permeate is stored in the filtered permeate tank 14.

[0028] Example 4 like Figure 1As shown in Example 3, Example 4 of the coal mine underground drainage water deep treatment equipment of the present invention also includes a regulating sedimentation unit, a filtration unit, a deep treatment unit, a reuse water supply unit, and a wastewater tank 23. The regulating sedimentation unit is used for the sedimentation of small particles in the drainage water. The filtration unit receives the drainage water discharged from the regulating sedimentation unit and filters it. The deep treatment unit performs deep treatment on the drainage water after the filtration unit and discharges the treated drainage water into the reuse water supply unit for use according to different needs. The wastewater tank 23 is used to collect the waste discharged from the regulating sedimentation unit, the filtration unit, and the deep treatment unit. The water in the wastewater tank 23 is transported to the goaf area through the wastewater lift pump 27 after sedimentation. The regulating sedimentation unit comprises, in sequence, a raw water lift pump 1, a jet aeration device 2, an inclined plate purification chamber 5, and a pre-sedimentation product water tank 9. The inclined plate purification chamber 5 includes a flocculation mixing zone and an inclined plate sedimentation zone. The flocculation mixing zone is equipped with a flocculation agitator 4 and a flocculation dosing device. The flocculation mixing zone is connected to the inclined plate sedimentation zone through holes. A sludge hopper 7 is installed at the bottom of the inclined plate sedimentation zone, and the sludge hopper 7 is connected to the wastewater tank 23 through a sludge pipeline. The filtration unit comprises, in sequence, a filter lift pump 10, a self-cleaning filter 11, a multi-media filter 12, an activated carbon filter 13, and a filter product water tank 14. The self-cleaning filter 11, the multi-media filter 12, and the activated carbon filter 13 are all connected to the wastewater tank 23 through sludge pipelines.

[0029] Unlike Example 3, in Example 4 of the coal mine underground drainage water deep treatment equipment of the present invention: the filtration unit further includes a filter backwash pump 15, and the filter product water tank 14 is connected to the multi-media filter 12 and the activated carbon filter 13 respectively through the filter backwash pump 15.

[0030] The filter backwash pump 15 is used for backwashing the multi-media filter 12 and the activated carbon filter 13. The pump inlet and outlet are equipped with electric valves and pressure sensors, which are linked to the operating status of the multi-media filter and the activated carbon filter for control. When the operating pump fails, the standby pump is automatically activated. The backwash water from the multi-media filter and the activated carbon filter enters the wastewater tank.

[0031] like Figure 2 As shown, the drain water from the goaf inflow sump is pumped to the inclined tube purification device 5 via the raw water lift pump 1, while the dissolved oxygen in the raw water is increased by the jet aeration device 2. When the turbidity of the incoming water is greater than 5 NTU, coagulant is added to the mixing flocculation tank 3; when the turbidity is less than 5 NTU, no further addition is made. The suspended small particles in the raw water are converted into larger particles through flocculation reaction. After sedimentation, the suspended solids in the raw water are removed, and the effluent is stored in the pre-sedimentation product water tank 9.

[0032] The permeate from the pre-sedimentation tank 9 is pumped by the filter booster pump 10 to the self-cleaning filter 11, where large particles larger than 100μm are removed. The permeate from the self-cleaning filter 11 then enters the multi-media filter 12 and the activated carbon filter 13 for further removal of turbidity and organic matter. The filtered permeate is stored in the filtered permeate tank 14.

[0033] The multi-media filter 12 and activated carbon filter 13 are backwashed using water produced by the filter product water tank 14, and the backwash water is discharged to the wastewater tank 23. The reverse osmosis equipment is flushed periodically according to the inlet water pressure and operating time, and the reverse osmosis cleaning water is discharged to the wastewater tank 23. After sedimentation, the water in the wastewater tank 23 is transported to the mined-out area by the wastewater lift pump 27.

[0034] Example 5 like Figure 1 As shown in Example 4, Example 5 of the coal mine underground drainage water deep treatment equipment of the present invention also includes a regulating sedimentation unit, a filtration unit, a deep treatment unit, a reuse water supply unit, and a wastewater tank 23. The regulating sedimentation unit is used for the sedimentation of small particles in the drainage water. The filtration unit receives the drainage water discharged from the regulating sedimentation unit and filters it. The deep treatment unit performs deep treatment on the drainage water after the filtration unit and discharges the treated drainage water into the reuse water supply unit for use according to different needs. The wastewater tank 23 is used to collect the waste discharged from the regulating sedimentation unit, the filtration unit, and the deep treatment unit. The water in the wastewater tank 23 is transported to the goaf area through the wastewater lift pump 27 after sedimentation. The regulating sedimentation unit comprises, in sequence, a raw water lift pump 1, a jet aeration device 2, an inclined plate purification chamber 5, and a pre-sedimentation product tank 9. The inclined plate purification chamber 5 includes a flocculation mixing zone and an inclined plate sedimentation zone. The flocculation mixing zone is equipped with a flocculation agitator 4 and a flocculation dosing device, and is connected to the inclined plate sedimentation zone through holes. A sludge hopper 7 is installed at the bottom of the inclined plate sedimentation zone, and the sludge hopper 7 is connected to the wastewater tank 23 through a sludge pipeline. The filtration unit comprises, in sequence, a filter lift pump 10, a self-cleaning filter 11, a multi-media filter 12, an activated carbon filter 13, and a filter product tank 14. The self-cleaning filter 11, the multi-media filter 12, and the activated carbon filter 13 are all connected to the wastewater tank 23 through sludge pipelines. The filtration unit also includes a filter backwash pump 15, and the filter product tank 14 is connected to the multi-media filter 12 and the activated carbon filter 13 through the filter backwash pump 15.

[0035] Unlike Example 4, in Example 5, the deep treatment equipment for underground coal mine drainage water of the present invention includes a reverse osmosis water supply pump 16, a security filter 17, a main booster pump 18 and a reverse osmosis membrane module 19 connected in sequence. The reverse osmosis membrane module 19 is equipped with a dosing device and is connected to the wastewater tank 23 through a sludge pipeline.

[0036] The security filter 17 has a filtration accuracy of 5μm and is made of stainless steel with a rubber lining. It features high water flux and high filtration accuracy, serving as the final step in blocking suspended particles before reverse osmosis treatment. The reverse osmosis supply pump 16 pumps water from the filtered product water tank 14 to the security filter 17. The pump is equipped with electric valves and pressure sensors at both inlet and outlet, linked to the water level in the filtered product water tank. It automatically stops when the tank level reaches a low level and automatically activates the standby pump in case of pump failure. The main booster pump 18 provides sufficient pressure to the reverse osmosis system, overcoming the osmotic pressure of the raw water on the surface of the reverse osmosis membrane module 19 to obtain demineralized water. The main booster pump 18 is a stainless steel centrifugal pump with a low-pressure controller at the inlet. When the inlet pressure is below 0.05MPa, the high-pressure pump stops to prevent cavitation and ensure safe operation. The reverse osmosis membrane module 19 uses a fouling-resistant brackish water desalination reverse osmosis membrane, with a single reverse osmosis feed capacity of 150m³. 3 The system has a desalination rate exceeding 97% per hour. The reverse osmosis system includes reverse osmosis membrane modules, online instruments, valve assemblies, and skids, and is automatically controlled by a PLC.

[0037] like Figure 2 As shown, the drain water from the goaf inflow sump is pumped to the inclined tube purification device 5 via the raw water lift pump 1, while the dissolved oxygen in the raw water is increased by the jet aeration device 2. When the turbidity of the incoming water is greater than 5 NTU, coagulant is added to the mixing flocculation tank 3; when the turbidity is less than 5 NTU, no further addition is made. The suspended small particles in the raw water are converted into larger particles through flocculation reaction. After sedimentation, the suspended solids in the raw water are removed, and the effluent is stored in the pre-sedimentation product water tank 9.

[0038] The permeate from the pre-sedimentation tank 9 is pumped by the filter booster pump 10 to the self-cleaning filter 11, where large particles larger than 100μm are removed. The permeate from the self-cleaning filter 11 then enters the multi-media filter 12 and the activated carbon filter 13 for further removal of turbidity and organic matter. The filtered permeate is stored in the filtered permeate tank 14.

[0039] The multi-media filter 12 and activated carbon filter 13 are backwashed using water produced by the filter product water tank 14, and the backwash water is discharged to the wastewater tank 23. The reverse osmosis equipment is flushed periodically according to the inlet water pressure and operating time, and the reverse osmosis cleaning water is discharged to the wastewater tank 23. After sedimentation, the water in the wastewater tank 23 is transported to the mined-out area by the wastewater lift pump 27.

[0040] The reverse osmosis water supply pump 16 pressurizes and delivers the filtered product water from the filtered product water tank 14 to the reverse osmosis system. After being filtered by the 5μm security filter 17, the effluent is pressurized by the main booster pump 18 and enters the reverse osmosis membrane module 19. Antiscaling and disinfecting agents are added before the pipeline enters the reverse osmosis membrane module 19.

[0041] Example 6 like Figure 1 As shown in Example 5, Example 6 of the coal mine underground drainage water deep treatment equipment of the present invention also includes a regulating sedimentation unit, a filtration unit, a deep treatment unit, a reuse water supply unit, and a wastewater tank 23; the regulating sedimentation unit is used for the sedimentation of small particles in the drainage water; the filtration unit receives the drainage water discharged from the regulating sedimentation unit and filters it; the deep treatment unit performs deep treatment on the drainage water after the filtration unit and discharges the treated drainage water into the reuse water supply unit for use according to different needs; the wastewater tank 23 is used to collect the waste discharged from the regulating sedimentation unit, the filtration unit, and the deep treatment unit; the water in the wastewater tank 23 is transported to the goaf area through the wastewater lift pump 27 after sedimentation. The regulating sedimentation unit comprises, in sequence, a raw water lift pump 1, a jet aeration device 2, an inclined plate purification chamber 5, and a pre-sedimentation product tank 9. The inclined plate purification chamber 5 includes a flocculation mixing zone and an inclined plate sedimentation zone. The flocculation mixing zone is equipped with a flocculation agitator 4 and a flocculation dosing device, and is connected to the inclined plate sedimentation zone through holes. A sludge hopper 7 is installed at the bottom of the inclined plate sedimentation zone, and the sludge hopper 7 is connected to the wastewater tank 23 through a sludge pipeline. The filtration unit comprises, in sequence, a filter lift pump 10, a self-cleaning filter 11, a multi-media filter 12, an activated carbon filter 13, and a filter product tank 14. The self-cleaning filter 11, the multi-media filter 12, and the activated carbon filter 13 are all connected to the wastewater tank 23 through sludge pipelines. The filtration unit also includes a filter backwash pump 15, and the filter product tank 14 is connected to the multi-media filter 12 and the activated carbon filter 13 through the filter backwash pump 15. The advanced treatment unit includes a reverse osmosis water supply pump 16, a security filter 17, a main booster pump 18, and a reverse osmosis membrane module 19 connected in sequence. The reverse osmosis membrane module 19 is equipped with a dosing device and is connected to the wastewater tank 23 through a sludge pipeline.

[0042] Unlike Example 5, in Example 6 of the coal mine underground drainage water deep treatment equipment of the present invention: the reuse water supply unit includes an underground fire sprinkler pump 24, a reverse osmosis permeate lift pump 25, a reverse osmosis concentrate lift pump 26, a reverse osmosis permeate tank 20, and a reverse osmosis concentrate pool 21; the inlet of the reverse osmosis permeate tank 20 is connected to the permeate end of the reverse osmosis membrane module 19, and the outlet of the reverse osmosis permeate tank 20 is connected to the reverse osmosis permeate lift pump 25, and the permeate is used for production water supply both above and below ground; the inlet of the reverse osmosis concentrate pool 21 is connected to the concentrate end of the reverse osmosis membrane module 19, and the outlet is connected to the reverse osmosis concentrate lift pump 26, and the concentrate is transported to structures such as surface power plants for comprehensive utilization. The measuring instrument 8 on the top of the reverse osmosis permeate tank and the concentrate pool is an ultrasonic level gauge.

[0043] The underground fire sprinkler pump 24 supplies water from the filtered water tank 14 to the underground water supply chamber. The water in the filtered water tank 14 is used for underground fire fighting. The pump inlet and outlet are equipped with electric valves and pressure sensors, which are linked to the water level in the filtered water tank for control.

[0044] The reverse osmosis permeate booster pump 25 supplies water from the reverse osmosis permeate tank 20 to the surface and underground water usage points. The pump inlet and outlet are equipped with electric valves and pressure sensors, which are linked to the water level control within the reverse osmosis permeate tank 20. The reverse osmosis concentrated brine booster pump 26 pressurizes water from the reverse osmosis concentrate tank 21 and supplies it to the surface. The concentrate is then transported to power plant and other auxiliary structures for comprehensive utilization. The pump inlet and outlet are equipped with electric valves and pressure sensors, which are linked to the water level control within the reverse osmosis concentrate tank. The reverse osmosis permeate tank 20 stores reverse osmosis permeate and is made of stainless steel; the reverse osmosis concentrate tank 21 stores reverse osmosis concentrate and is constructed of concrete. Ultrasonic level gauges 8 are installed on the top of both the permeate and concentrate tanks for level monitoring.

[0045] like Figure 2 As shown, the drain water from the goaf inflow sump is pumped to the inclined tube purification device 5 via the raw water lift pump 1, while the dissolved oxygen in the raw water is increased by the jet aeration device 2. When the turbidity of the incoming water is greater than 5 NTU, coagulant is added to the mixing flocculation tank 3; when the turbidity is less than 5 NTU, no further addition is made. The suspended small particles in the raw water are converted into larger particles through flocculation reaction. After sedimentation, the suspended solids in the raw water are removed, and the effluent is stored in the pre-sedimentation product water tank 9.

[0046] The permeate from the pre-sedimentation tank 9 is pumped by the filter booster pump 10 to the self-cleaning filter 11, where large particles larger than 100μm are removed. The permeate from the self-cleaning filter 11 then enters the multi-media filter 12 and the activated carbon filter 13 for further removal of turbidity and organic matter. The filtered permeate is stored in the filtered permeate tank 14.

[0047] The multi-media filter 12 and activated carbon filter 13 are backwashed using water produced by the filter product water tank 14, and the backwash water is discharged to the wastewater tank 23. The reverse osmosis equipment is flushed periodically according to the inlet water pressure and operating time, and the reverse osmosis cleaning water is discharged to the wastewater tank 23. After sedimentation, the water in the wastewater tank 23 is transported to the mined-out area by the wastewater lift pump 27.

[0048] The reverse osmosis feed water pump 16 pressurizes and delivers the filtered product water from the filter product water tank 14 to the reverse osmosis system. After filtration by the 5μm security filter 17, the effluent is pressurized by the main booster pump 18 and enters the reverse osmosis membrane module 19. Antiscaling and disinfecting agents are added before the pipes enter the reverse osmosis membrane module 19. The product water from the reverse osmosis membrane module 19 enters the reverse osmosis product water tank 20 for production water supply both above and below ground. The reverse osmosis concentrate enters the reverse osmosis concentrate pool 21 for water supply to the surface power plant and its auxiliary structures.

[0049] The total dissolved solids content of the drainage water from a coal mine ranges from 1600 to 2000 mg / L, classifying it as highly mineralized mine water. The raw water turbidity ranges from 0.94 to 9.26 NTU, and the total hardness ranges from 667.5 to 1051.0 mg / L. Based on the characteristics of the raw water and treatment requirements, the main focus is on removing turbidity, mineralization, and hardness.

[0050] Through the process of this invention, the effluent water quality has a total dissolved solids ≤500mg / L, turbidity ≤1NTU, and total hardness ≤450mg / L. The effluent water quality of the coal mine drainage water deep treatment system meets the standard of "Code for Design of Water Supply and Drainage in Coal Industry" (GB50810-2012). The water quality indicators for fire fighting and sprinkler systems meet the standard of "Code for Design of Fire Fighting and Sprinkler Systems in Coal Mines" (GB50383-2016), and the effluent water quality meets the requirements of the corresponding national standards and specifications according to different uses.

[0051] The foregoing description illustrates and describes several preferred embodiments of the invention. However, as previously stated, it should be understood that the invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the invention should be within the protection scope of the appended claims.

Claims

1. A deep treatment device for underground drainage water in coal mines, characterized in that, It includes a regulating sedimentation unit, a filtration unit, a deep treatment unit, a reuse water supply unit, and a wastewater tank (23); the regulating sedimentation unit is used to settle small particles in the drain water, the filtration unit receives the drain water discharged from the regulating sedimentation unit and filters it, the deep treatment unit performs deep treatment on the drain water after the filtration unit and discharges the treated drain water into the reuse water supply unit for use according to different needs; the wastewater tank (23) is used to collect waste discharged from the regulating sedimentation unit, the filtration unit, and the deep treatment unit.

2. The deep treatment equipment for underground coal mine drainage water according to claim 1, characterized in that, The regulating sedimentation unit includes a raw water lift pump (1), a jet aeration device (2), an inclined plate purification chamber (5), and a pre-sedimentation product tank (9) in sequence. The inclined plate purification chamber (5) includes a flocculation mixing zone and an inclined plate sedimentation zone. The flocculation mixing zone is equipped with a flocculation agitator (4) and a flocculation dosing device. The flocculation mixing zone is connected to the inclined plate sedimentation zone through holes. A sludge hopper (7) is set at the bottom of the inclined plate sedimentation zone. The sludge hopper (7) is connected to the wastewater tank (23) through a sludge pipeline.

3. The deep treatment equipment for underground coal mine drainage water according to claim 2, characterized in that, The number of mud buckets (7) is multiple.

4. The deep treatment equipment for underground coal mine drainage water according to claim 3, characterized in that, The filtration unit includes a filtration booster pump (10), a self-cleaning filter (11), a multi-media filter (12), an activated carbon filter (13), and a filtration product water tank (14) connected in sequence; the self-cleaning filter (11), the multi-media filter (12), and the activated carbon filter (13) are all connected to the wastewater tank (23) through sludge pipelines.

5. The deep treatment equipment for underground coal mine drainage water according to claim 4, characterized in that, The filtration unit also includes a filter backwash pump (15), and the filter product water tank (14) is connected to the multi-media filter (12) and the activated carbon filter (13) respectively through the filter backwash pump (15).

6. The deep treatment equipment for underground coal mine drainage water according to claim 5, characterized in that, The deep treatment unit includes a reverse osmosis water supply pump (16), a security filter (17), a main booster pump (18), and a reverse osmosis membrane module (19) connected in sequence. The reverse osmosis membrane module (19) is equipped with a dosing device and is connected to the wastewater tank (23) through a sludge pipeline.

7. The deep treatment equipment for underground coal mine drainage water according to claim 6, characterized in that, The reuse water supply unit includes a downhole fire sprinkler pump (24), a reverse osmosis permeate booster pump (25), a reverse osmosis concentrate booster pump (26), a reverse osmosis permeate tank (20), and a reverse osmosis concentrate pool (21). The inlet of the reverse osmosis permeate tank (20) is connected to the permeate end of the reverse osmosis membrane module (19), and the outlet of the reverse osmosis permeate tank (20) is connected to the reverse osmosis permeate booster pump (25). The permeate is used for production water supply above and below ground. The inlet of the reverse osmosis concentrate pool (21) is connected to the concentrate end of the reverse osmosis membrane module (19), and the outlet is connected to the reverse osmosis concentrate booster pump (26). The concentrate is transported to structures such as ground power plants for comprehensive utilization. The measuring instrument (8) on the top of the reverse osmosis permeate tank and the concentrate pool is an ultrasonic level gauge.

8. The deep treatment equipment for underground coal mine drainage water according to claim 7, characterized in that, The top of the pre-sedimentation product water tank (9), the filter product water tank (14), and the reverse osmosis product water tank (20) is equipped with an ultrasonic level gauge (8).

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