Mine water comprehensive treatment and resource utilization device and use method thereof

Abstract

The application belongs to the technical field of water treatment, and discloses a mine water comprehensive treatment and resource utilization device and a use method thereof. Through multiple process combinations such as pretreatment (mechanical + precipitation + ceramic membrane + advanced oxidation), deep treatment (capacitive deionization + ion adsorption), resource recovery (membrane concentration) and the like, the application effectively deals with the characteristics of complex mine water quality and large fluctuation, ensures the high quality and stability of the final water production and the resource utilization product, realizes the resource utilization and near-zero discharge of mine water, greatly improves the ecological environment of a mining area, helps to build a green mine, meets the green and low-carbon development requirements of the coal industry, and realizes intelligent management, and has remarkable environmental, economic and technical advantages.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to a device for comprehensive treatment and resource utilization of mine water and its usage method. Background Technology

[0002] Mine water, a byproduct of coal mining, is discharged in massive quantities and has a complex composition, typically containing high concentrations of salt (such as sodium sulfate and sodium chloride), suspended solids, organic matter, heavy metal ions, and colloidal impurities. Untreated mine water not only wastes water resources but also causes continuous pollution to the surrounding soil, water bodies, and other ecological environments.

[0003] Existing mine water treatment technologies have several limitations: First, traditional physical treatment facilities are outdated and inefficient, only removing some suspended solids and failing to meet high-standard reuse requirements. Second, capacitive deionization technology is susceptible to organic contamination affecting desalination efficiency when treating complex mine water, and the electrode materials lack adaptability to multi-component salts. Third, concentrated brine treatment often employs direct discharge or simple evaporation, failing to achieve resource utilization, and bipolar membrane acid-base generation technology suffers from high energy consumption due to insufficient feed salt concentration. Fourth, selective electrodialysis for separating sodium sulfate and sodium chloride has poor process stability, making it difficult to guarantee product purity. Fifth, highly polluted wastewater generated under special operating conditions (such as cleaning water tanks underground or withdrawing from fully mechanized mining faces) lacks targeted treatment methods, resulting in unsatisfactory COD removal. Sixth, the final safe disposal of heavy metals and the ultimate treatment of high-salt concentrates are not adequately considered, posing potential environmental risks.

[0004] Therefore, developing a comprehensive treatment device that can achieve deep desalination of mine water, efficient degradation of organic matter, resource recovery of concentrated brine, safe disposal of pollutants, and deep integration with coal plant processes has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a device and method for the comprehensive treatment and resource utilization of mine water, which aims to overcome the shortcomings of existing mine water treatment technologies.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0007] This invention provides a comprehensive mine water treatment and resource utilization device, including a pretreatment unit, a deep treatment unit, a resource recovery unit, a pollutant safe disposal unit, a resource reuse unit, and an intelligent control unit;

[0008] The preprocessing unit, the deep processing unit, and the resource recycling unit are connected sequentially.

[0009] The pretreatment unit includes a mechanical filtration unit, a mesoporous ceramic membrane filtration unit, and an advanced oxidation pretreatment unit connected in sequence.

[0010] The deep processing unit includes a capacitor deionization unit and an ion-enhanced adsorption unit connected in sequence.

[0011] The resource recovery unit includes a membrane concentration integration unit, a bipolar membrane water inlet protection unit, and a bipolar membrane unit connected in sequence.

[0012] The pollutant safe disposal unit includes a heavy metal safe solidification unit and a high-salt wastewater evaporation and crystallization unit; the heavy metal safe solidification unit is connected to the pretreatment unit and the ion-enhanced adsorption unit respectively; the high-salt wastewater evaporation and crystallization unit is connected to the resource recovery unit.

[0013] The resource recycling unit includes a graded wastewater recycling unit, a salt product application unit, an acid-base recycling and blending unit, a solid waste sorting and separation unit, a solid particle recycling and processing unit, and a resource recycling intelligent matching unit. The graded wastewater recycling unit is connected to the deep treatment unit; the salt product application unit is connected to the high-salinity wastewater evaporation and crystallization unit; the acid-base recycling and blending unit is connected to the bipolar membrane unit; the solid waste sorting and separation unit is connected to the pretreatment unit and the heavy metal safe solidification unit; the solid particle recycling and processing unit is connected to the solid waste sorting and separation unit and the high-salinity wastewater evaporation and crystallization unit; and the resource recycling intelligent matching unit is connected to the graded wastewater recycling unit, the salt product application unit, the acid-base recycling and blending unit, the solid waste sorting and separation unit, and the solid particle recycling and processing unit.

[0014] The intelligent control unit is connected to the pretreatment unit, the deep processing unit, the resource recovery unit, the pollutant safe disposal unit, and the resource reuse unit, respectively.

[0015] Furthermore, in the aforementioned mine water integrated treatment and resource utilization device, the pretreatment unit further includes a high-efficiency inclined tube sedimentation unit; in the pretreatment unit, the mechanical filtration unit, the high-efficiency inclined tube sedimentation unit, the mesoporous ceramic membrane filtration unit, and the advanced oxidation pretreatment unit are connected in sequence.

[0016] Furthermore, in the aforementioned mine water integrated treatment and resource utilization device, the deep treatment unit further includes a microbial co-treatment unit; in the deep treatment unit, the capacitive deionization unit, the microbial co-treatment unit, and the ion-enhanced adsorption unit are sequentially connected.

[0017] Furthermore, in the aforementioned mine water integrated treatment and resource utilization device, the resource recovery unit further includes a selective electrodialysis unit and a reaction precipitation control unit; in the resource recovery unit, a membrane concentration integration unit, a bipolar membrane feed water protection unit, a bipolar membrane unit, a selective electrodialysis unit, and a reaction precipitation control unit are sequentially connected.

[0018] Furthermore, in the aforementioned mine water integrated treatment and resource utilization device, the selective electrodialysis unit is connected to the acid-base recycling and blending unit;

[0019] The reaction precipitation control unit is connected to the heavy metal safe curing unit.

[0020] Furthermore, in the aforementioned mine water comprehensive treatment and resource utilization device, the mine water comprehensive treatment and resource utilization device also includes a waste heat recovery unit; the waste heat recovery unit is connected to the membrane concentration integration unit, the bipolar membrane unit, the high-salt wastewater evaporation and crystallization unit, and the solid particle recovery and processing unit, respectively.

[0021] Furthermore, in the aforementioned mine water comprehensive treatment and resource utilization device, the mine water comprehensive treatment and resource utilization device also includes an emergency treatment buffer unit; the emergency treatment buffer unit is connected to the pretreatment unit, the deep treatment unit, the resource recovery unit, the pollutant safe disposal unit, the resource reuse unit, and the intelligent control unit respectively.

[0022] This invention also provides a method for using a mine water integrated treatment and resource utilization device, comprising the following steps:

[0023] (1) The mine water is sequentially passed through a mechanical filtration unit to remove large particulate impurities, a mesoporous ceramic membrane filtration unit to remove colloidal particles, and then through an advanced oxidation pretreatment unit for preliminary degradation of organic matter to obtain pretreated mine water; large particulate impurities are sent to a solid waste sorting unit for sorting, the sorted coal sludge enters a solid particle recycling and processing unit, and the sorted salt sludge, chemical sludge and colloidal particles are sent to a heavy metal safety solidification unit for treatment;

[0024] (2) The pretreated mine water enters the capacitor deionization unit for desalination treatment, and aeration is turned on to simultaneously carry out the electro-Fenton reaction; the desalinated water enters the ion-enhanced adsorption unit for purification; the waste resin generated by the ion-enhanced adsorption unit is sent to the heavy metal safety solidification unit for treatment; the purified water from the deep treatment unit is reused in a graded wastewater reuse unit.

[0025] (3) The concentrated brine generated by capacitor deionization is concentrated in the membrane concentration integration unit, and the concentrated solution enters the bipolar membrane water supply protection unit for pretreatment; the pretreated concentrated brine enters the bipolar membrane unit to be converted into a primary acid-base solution; the primary acid-base solution is sent to the acid-base recycling and preparation unit; the concentrated brine or waste liquid that cannot be directly recycled in the resource recovery unit enters the high-salt wastewater evaporation and crystallization unit for evaporation and crystallization treatment, and the crude salt obtained is sent to the solid particle recovery and processing unit for processing or sent to the salt product application unit for storage for future use.

[0026] The intelligent control unit monitors the operating status of each unit, and the intelligent resource recycling matching unit adjusts the allocation of recycled materials.

[0027] Furthermore, in the method of use, in step (1), the advanced oxidation pretreatment unit adopts a combination process of ozone oxidation and ultraviolet photocatalytic oxidation, with an ozone dosage of 15-30 mg / L, an ultraviolet wavelength of 254 nm, and a treatment time of 20-40 min.

[0028] In step (2), the electrode used in the capacitor deionization unit is a CeO2-modified activated carbon electrode or a Co electrode. 0.5 Ni 0.5 Fe2O4 metal oxide electrode;

[0029] In step (2), the aeration rate is 0.5 to 1.0 L / min;

[0030] In step (2), the operating voltage of the desalination treatment is 1.2–1.6V, and the current density of the desalination treatment is 5–15 mA / cm². 2 .

[0031] Furthermore, in the method of use, in step (3), the membrane concentration integrated unit adopts a nanofiltration-reverse osmosis combined process, the pressure of nanofiltration is 1.5-2.5 MPa, and the pressure of reverse osmosis is 2.5-3.5 MPa;

[0032] In step (3), the salt concentration of the concentrate is 15-20 wt%.

[0033] In step (3), the hardness of the pretreated concentrated brine is <5 mg / L;

[0034] In step (3), the current density of the bipolar film unit is 20–40 mA / cm². 2 The temperature of the bipolar film unit is 25–35°C.

[0035] As can be seen from the above technical solution, compared with the prior art, the present invention has the following beneficial effects:

[0036] (1) This invention utilizes a pollutant safe disposal unit (safe solidification of heavy metals + evaporation and crystallization of high-salt wastewater) to safely dispose of or solidify all solid wastes (such as coal slime, salt slime, chemical sludge, and waste resin) and high-concentration waste liquids that cannot be recycled, thus avoiding secondary pollution and truly achieving the goal of zero waste or harmless waste disposal. Furthermore, the effluent purified by the deep treatment unit has excellent water quality and can be reused in stages according to different water use standards (such as underground dust control, ground greening, and industrial circulating cooling water) through a graded wastewater reuse unit, greatly improving the recycling rate of mine water and significantly reducing the pressure on the extraction of surface water and groundwater around the mining area.

[0037] (2) The bipolar membrane unit of this invention directly converts salts into acids (such as HCl and H2SO4) and bases (such as NaOH), allowing the self-production and reuse of expensive chemicals consumed in large quantities in water treatment and production, which are then recycled for pretreatment, cleaning, and other process stages, reducing the amount of external chemical agents added and the costs of transportation and storage. Furthermore, the coal slime separated from impurities by the solid waste sorting unit can be sold or further utilized as low-calorific-value fuel or blending material after being sent to the solid particle recycling and processing unit. Simultaneously, the waste heat recovery unit effectively recovers waste heat generated within the system (such as in evaporation crystallization and the bipolar membrane process), which is used in the solid particle recycling and processing unit to dry the recovered materials or in other stages requiring heating, significantly reducing system energy consumption.

[0038] (3) This invention effectively addresses the complex and fluctuating characteristics of mine water quality by combining multiple processes, including pretreatment (mechanical + precipitation + ceramic membrane + advanced oxidation), deep treatment (capacitive deionization + ion adsorption), and resource recovery (membrane concentration), ensuring the high quality and stability of the final water product and resource-based products. The capacitive deionization unit simultaneously performs aeration and electro-Fenton reaction, achieving synergistic desalination and organic matter degradation, thus improving unit efficiency. The microbial co-treatment unit, as a guarantee for deep treatment, further degrades recalcitrant organic matter and enhances the system's resistance to shock loads.

[0039] (4) This invention realizes the resource utilization and near-zero discharge of mine water, greatly improves the ecological environment of the mining area, helps to build a green mine, and meets the requirements of green and low-carbon development of the coal industry; at the same time, it realizes intelligent management and has significant environmental, economic and technological advantages. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0041] Figure 1 This is a schematic diagram of a mine water comprehensive treatment and resource utilization device. Detailed Implementation

[0042] This invention provides a comprehensive mine water treatment and resource utilization device, including a pretreatment unit, a deep treatment unit, a resource recovery unit, a pollutant safe disposal unit, a resource reuse unit, and an intelligent control unit;

[0043] The preprocessing unit, the deep processing unit, and the resource recycling unit are connected sequentially.

[0044] The pretreatment unit includes a mechanical filtration unit, a mesoporous ceramic membrane filtration unit, and an advanced oxidation pretreatment unit connected in sequence.

[0045] The deep processing unit includes a capacitor deionization unit and an ion-enhanced adsorption unit connected in sequence.

[0046] The resource recovery unit includes a membrane concentration integration unit, a bipolar membrane water inlet protection unit, and a bipolar membrane unit connected in sequence.

[0047] The pollutant safe disposal unit includes a heavy metal safe solidification unit and a high-salt wastewater evaporation and crystallization unit; the heavy metal safe solidification unit is connected to the pretreatment unit and the ion-enhanced adsorption unit respectively; the high-salt wastewater evaporation and crystallization unit is connected to the resource recovery unit.

[0048] The resource recycling unit includes a graded wastewater recycling unit, a salt product application unit, an acid-base recycling and blending unit, a solid waste sorting and separation unit, a solid particle recycling and processing unit, and a resource recycling intelligent matching unit. The graded wastewater recycling unit is connected to the deep treatment unit; the salt product application unit is connected to the high-salinity wastewater evaporation and crystallization unit; the acid-base recycling and blending unit is connected to the bipolar membrane unit; the solid waste sorting and separation unit is connected to the pretreatment unit and the heavy metal safe solidification unit; the solid particle recycling and processing unit is connected to the solid waste sorting and separation unit and the high-salinity wastewater evaporation and crystallization unit; and the resource recycling intelligent matching unit is connected to the graded wastewater recycling unit, the salt product application unit, the acid-base recycling and blending unit, the solid waste sorting and separation unit, and the solid particle recycling and processing unit.

[0049] The intelligent control unit is connected to the pretreatment unit, the deep processing unit, the resource recovery unit, the pollutant safe disposal unit, and the resource reuse unit, respectively.

[0050] In this invention, the pretreatment unit further includes a high-efficiency inclined tube sedimentation unit.

[0051] In this invention, the pretreatment unit comprises a mechanical filtration unit, a high-efficiency inclined tube sedimentation unit, a mesoporous ceramic membrane filtration unit, and an advanced oxidation pretreatment unit connected in sequence.

[0052] In this invention, the high-efficiency inclined tube sedimentation unit is upgraded from an old physical treatment facility and is used as a backup treatment facility when cleaning the water tank in the well.

[0053] In this invention, the deep processing unit further includes a microbial co-processing unit, the purpose of which is to degrade the intermediate products and residual biodegradable organic matter generated by electro-Fenton, thereby forming a synergistic effect.

[0054] In this invention, the deep processing unit comprises a capacitive deionization unit, a microbial co-processing unit, and an ion-enhanced adsorption unit connected in sequence.

[0055] In this invention, the ion-enhanced adsorption unit is filled with chelating ion exchange resin, with the aim of deeply removing residual salts and heavy metals.

[0056] In this invention, the resource recovery unit further includes a selective electrodialysis unit and a reaction precipitation control unit.

[0057] In this invention, the resource recovery unit comprises a membrane concentration integration unit, a bipolar membrane feed water protection unit, a bipolar membrane unit, a selective electrodialysis unit, and a reaction precipitation control unit connected in sequence.

[0058] In this invention, the bipolar membrane inlet water protection unit preferably includes a chemical softening / ion exchange unit, an activated carbon adsorption / filtration unit, and an ORP / pH adjustment unit, with the aim of removing residual scale ions, trace organic matter, and colloids.

[0059] In this invention, the selective electrodialysis unit is connected to the acid-base recycling and preparation unit.

[0060] In this invention, the selective electrodialysis unit is equipped with a dedicated ion exchange membrane, the purpose of which is to separate monovalent anions and divalent anions.

[0061] In this invention, the reaction precipitation control unit is connected to the heavy metal safe curing unit.

[0062] In this invention, the reaction precipitation control unit improves separation purity by adding a precipitating agent. The precipitating agent includes, but is not limited to, barium chloride.

[0063] In this invention, the heavy metal safe solidification unit receives waste resin generated by the ion-enhanced adsorption unit, metal sludge generated by the reaction precipitation control unit, salt sludge and sludge separated from solid waste, and sludge separated by the pretreatment unit (including the high-efficiency inclined tube sedimentation unit). The solidified body is treated by methods including but not limited to cement solidification and chemical stabilization, and the solidified body meets the relevant solid waste disposal standards.

[0064] In this invention, the high-salt wastewater evaporation and crystallization unit receives concentrated brine that cannot be completely absorbed by bipolar membrane and selective electrodialysis, ultra-high-salt wastewater generated when the system is abnormal, and brine that cannot be recycled from the resource recovery unit, as well as waste liquid generated by the bipolar membrane inlet water protection unit.

[0065] In this invention, the mine water comprehensive treatment and resource utilization device also includes a waste heat recovery unit.

[0066] In this invention, the waste heat recovery unit is connected to the membrane concentration integration unit, the bipolar membrane unit, the high-salt wastewater evaporation and crystallization unit, and the solid particle recovery and processing unit, respectively. The waste heat recovery unit effectively recovers waste heat generated within the system (such as in the evaporation and crystallization, bipolar membrane processes), which is then used in the solid particle recovery and processing unit to dry the recovered materials or in other processes requiring heating.

[0067] In this invention, the mine water integrated treatment and resource utilization device also includes an emergency treatment buffer unit.

[0068] In this invention, the emergency treatment buffer unit is connected to the pretreatment unit, the deep treatment unit, the resource recovery unit, the pollutant safe disposal unit, the resource reuse unit, and the intelligent control unit, respectively.

[0069] This invention also provides a method for using a mine water integrated treatment and resource utilization device, comprising the following steps:

[0070] (1) The mine water is sequentially passed through a mechanical filtration unit to remove large particulate impurities, a mesoporous ceramic membrane filtration unit to remove colloidal particles, and then through an advanced oxidation pretreatment unit for preliminary degradation of organic matter to obtain pretreated mine water; large particulate impurities are sent to a solid waste sorting unit for sorting, the sorted coal sludge enters a solid particle recycling and processing unit, and the sorted salt sludge, chemical sludge and colloidal particles are sent to a heavy metal safety solidification unit for treatment;

[0071] (2) The pretreated mine water enters the capacitor deionization unit for desalination treatment, and aeration is turned on to simultaneously carry out the electro-Fenton reaction; the desalinated water enters the ion-enhanced adsorption unit for purification; the waste resin generated by the ion-enhanced adsorption unit is sent to the heavy metal safety solidification unit for treatment; the purified water from the deep treatment unit is reused in a graded wastewater reuse unit.

[0072] (3) The concentrated brine generated by capacitor deionization is concentrated in the membrane concentration integration unit, and the concentrated solution enters the bipolar membrane water supply protection unit for pretreatment; the pretreated concentrated brine enters the bipolar membrane unit to be converted into a primary acid-base solution; the primary acid-base solution is sent to the acid-base recycling and preparation unit; the concentrated brine or waste liquid that cannot be directly recycled in the resource recovery unit enters the high-salt wastewater evaporation and crystallization unit for evaporation and crystallization treatment, and the crude salt obtained is sent to the solid particle recovery and processing unit for processing or sent to the salt product application unit for storage for future use.

[0073] The intelligent control unit monitors the operating status of each unit, and the intelligent resource recycling matching unit adjusts the allocation of recycled materials.

[0074] In this invention, in step (1), the mine water is filtered by a mechanical filtration unit to remove large particulate impurities, separated from the mine water by a high-efficiency inclined tube sedimentation unit, and filtered by a mesoporous ceramic membrane filtration unit to remove colloidal particles.

[0075] In this invention, the conditions for the high-efficiency inclined tube sedimentation unit include: the inclined tube inclination angle is preferably 60±5°; the tube diameter is preferably 25-35 mm, more preferably 28-32 mm, and even more preferably 30 mm; the hydraulic load is preferably 1.5-2.5 m. 3 / (m 2 ·h), further preferably 1.8~2.2m 3 / (m 2 ·h), more preferably 2.0m 3 / (m 2 ·h).

[0076] In this invention, in step (1), the advanced oxidation pretreatment unit adopts a combination process of ozone oxidation and ultraviolet photocatalytic oxidation; the ozone dosage is preferably 15-30 mg / L, more preferably 18-25 mg / L, and more preferably 20 mg / L; the ultraviolet wavelength is preferably 254 nm; the treatment time is preferably 20-40 min, more preferably 25-35 min, and more preferably 30 min.

[0077] In this invention, in step (2), the electrode used in the capacitor deionization unit is preferably a CeO2-modified activated carbon electrode or a Co electrode. 0.5 Ni 0.5 The Fe2O4 metal oxide electrode is more preferably a CeO2 modified activated carbon electrode.

[0078] In this invention, in step (2), the aeration rate is preferably 0.5 to 1.0 L / min, more preferably 0.6 to 0.8 L / min, and even more preferably 0.8 L / min.

[0079] In this invention, in step (2), the operating voltage of the desalination treatment is preferably 1.2–1.6V, more preferably 1.3–1.5V, and even more preferably 1.4V; the current density of the desalination treatment is preferably 5–15 mA / cm². 2 Further preferably 8–12 mA / cm 2 More preferably 10 mA / cm 2 .

[0080] In this invention, in step (2), the microbial co-processing unit is used after the electro-Fenton reaction. The concentration of the added functional microbial flora is preferably 10. 6 ~10 8 CFU / mL, more preferably 10 7 ~10 8 CFU / mL, more preferably 5×10⁻⁶ 7 CFU / mL.

[0081] In this invention, in step (2), the water flow rate of the ion-enhanced adsorption unit is preferably 10-15 m / h, more preferably 11-13 m / h, and even more preferably 12 m / h.

[0082] In this invention, in step (2), the graded wastewater reuse unit divides the purified effluent from the deep treatment unit into three levels: Level 1 water (conductivity ≤ 50 μS / cm) is used for cleaning filter cloths in coal plant filter presses and for laboratory water; Level 2 water (conductivity 50~300 μS / cm) is used for dust suppression spraying in fully mechanized mining faces and for supplementary water in coal preparation plants; Level 3 water (conductivity 300~1000 μS / cm) is used for road sprinkling and dust suppression in coal yards.

[0083] In this invention, in step (3), the membrane concentration integrated unit adopts a nanofiltration-reverse osmosis combined process; the nanofiltration pressure is preferably 1.5-2.5 MPa, more preferably 1.8-2.2 MPa, and even more preferably 2.0 MPa; the reverse osmosis pressure is preferably 2.5-3.5 MPa, more preferably 2.8-3.2 MPa, and even more preferably 3.0 MPa.

[0084] In this invention, in step (3), the salt concentration of the concentrate is preferably 15-20 wt%, more preferably 16-19 wt%, and even more preferably 17.8 wt%.

[0085] In this invention, in step (3), the hardness of the pretreated concentrated brine is <5 mg / L.

[0086] In this invention, in step (3), the current density of the bipolar film unit is preferably 20-40 mA / cm². 2 More preferably 25–35 mA / cm2 More preferably 30 mA / cm 2 The temperature of the bipolar film unit is preferably 25-35°C, more preferably 28-32°C, and even more preferably 30°C.

[0087] In this invention, in step (3), the acid solution in the primary acid-base solution is sent to a selective electrodialysis unit to further separate monovalent anions and divalent anions. The monovalent anions are then sent to a reaction precipitation control unit, where a precipitant is added to improve the separation purity.

[0088] In this invention, the electric field strength of the selective electrodialysis unit is preferably 10-20 V / cm, more preferably 12-18 V / cm, and even more preferably 15 V / cm.

[0089] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0090] Example 1

[0091] This embodiment provides a Figure 1 The method of using the mine water integrated treatment and resource utilization device shown includes the following steps:

[0092] (1) The mine water is sequentially passed through a mechanical filtration unit to remove large particulate impurities, a mesoporous ceramic membrane filtration unit to remove colloidal particles, and then through an advanced oxidation pretreatment unit for preliminary degradation of organic matter. The ozone dosage is 20 mg / L, and the ultraviolet reaction is 30 min to obtain pretreated mine water. Large particulate impurities are sent to a solid waste sorting unit for sorting. The sorted coal sludge is sent to a solid particle recycling and processing unit to prepare low-calorific-value boiler fuel. The sorted salt mud, chemical sludge and colloidal particles are sent to a heavy metal safety solidification unit for solidified body landfill treatment.

[0093] (2) The pretreated mine water enters the capacitor deionization unit for desalination, using CeO2 modified activated carbon electrodes, with a voltage of 1.4V and a current density of 10mA / cm³. 2 Aeration was initiated at a rate of 0.8 L / min, simultaneously initiating an electro-Fenton reaction; followed by synergistic microbial treatment, with functional bacterial flora added at a concentration of 5 × 10⁻⁶. 7CFU / mL, further degrading organic matter; the desalination effluent enters the ion-enhanced adsorption unit for purification, the adsorption unit is filled with D401 chelating resin, and the water flow rate is controlled at 12m / h; the waste resin generated by the ion-enhanced adsorption unit is sent to the heavy metal safe solidification unit for solidified body landfill treatment; the purified effluent from the deep treatment unit is reused in stages through the staged wastewater reuse unit (stage 1 water is used for filter press cleaning, stage 2 water is used for fully mechanized mining spraying, and stage 3 water is used for coal yard dust suppression).

[0094] (3) The concentrated brine generated by capacitor deionization is concentrated in a membrane concentration integrated unit using a nanofiltration-reverse osmosis combined process. The nanofiltration pressure is 2.0 MPa, the reverse osmosis pressure is 3.0 MPa, and the salt concentration of the concentrate is 17.8 wt%. The resulting concentrate enters the bipolar membrane feed water protection unit for pretreatment to remove hardness to <5 mg / L. The pretreated concentrated brine then enters the bipolar membrane unit with a current density set at 30 mA / cm². 2 The solution is heated to 30℃ and converted into a primary acid-base solution. The primary base solution is then sent to the acid-base recycling and preparation unit. The primary acid solution enters a selective electrodialysis device with an electric field strength of 15V / cm to separate hydrochloric acid and sulfuric acid. The hydrochloric acid is then sent to the reaction precipitation control unit, where 2mg / L of barium chloride is added to improve its purity. The hydrochloric acid and sulfuric acid are then sent to the acid-base recycling and preparation unit, respectively. The concentrated brine that cannot be directly recycled from the bipolar membrane unit is then sent to the high-salt wastewater evaporation and crystallization unit for evaporation and crystallization treatment. The resulting crude salt is then sent to the salt product application unit for use in suppressing spontaneous combustion of coal piles.

[0095] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A comprehensive mine water treatment and resource utilization device, characterized in that, It includes a pretreatment unit, an advanced treatment unit, a resource recovery unit, a pollutant safe disposal unit, a resource reuse unit, and an intelligent control unit; The preprocessing unit, the deep processing unit, and the resource recycling unit are connected sequentially. The pretreatment unit includes a mechanical filtration unit, a mesoporous ceramic membrane filtration unit, and an advanced oxidation pretreatment unit connected in sequence. The deep treatment unit includes a capacitor deionization unit and an ion-enhanced adsorption unit connected in sequence; the desalinated water produced by the capacitor deionization unit enters the ion-enhanced adsorption unit. The resource recovery unit includes a membrane concentration integration unit, a bipolar membrane feed water protection unit, a bipolar membrane unit, a selective electrodialysis unit, and a reaction precipitation control unit connected in sequence; the concentrated brine generated by the capacitor deionization unit enters the membrane concentration integration unit; the primary acid solution converted by the bipolar membrane unit enters the selective electrodialysis unit to separate hydrochloric acid and sulfuric acid, and the hydrochloric acid is sent to the reaction precipitation control unit to improve the purity of the hydrochloric acid; The pollutant safety treatment unit includes a heavy metal safety solidification unit and a high-salt wastewater evaporation and crystallization unit. The heavy metal safe solidification unit is connected to the pretreatment unit and the ion-enhanced adsorption unit, respectively; the high-salt wastewater evaporation and crystallization unit is connected to the resource recovery unit. The resource recycling unit includes a graded wastewater recycling unit, a salt product application unit, an acid-base recycling and blending unit, a solid waste sorting and separation unit, a solid particle recycling and processing unit, and a resource recycling intelligent matching unit. The graded wastewater recycling unit is connected to the deep treatment unit; the salt product application unit is connected to the high-salinity wastewater evaporation and crystallization unit; the acid-base recycling and blending unit is connected to the bipolar membrane unit; the solid waste sorting and separation unit is connected to the pretreatment unit and the heavy metal safe solidification unit; the solid particle recycling and processing unit is connected to the solid waste sorting and separation unit and the high-salinity wastewater evaporation and crystallization unit; and the resource recycling intelligent matching unit is connected to the graded wastewater recycling unit, the salt product application unit, the acid-base recycling and blending unit, the solid waste sorting and separation unit, and the solid particle recycling and processing unit. The intelligent control unit is connected to the pretreatment unit, the deep processing unit, the resource recovery unit, the pollutant safe disposal unit, and the resource reuse unit, respectively.

2. The mine water comprehensive treatment and resource utilization device according to claim 1, characterized in that, The pretreatment unit also includes a high-efficiency inclined tube sedimentation unit; in the pretreatment unit, the mechanical filtration unit, the high-efficiency inclined tube sedimentation unit, the mesoporous ceramic membrane filtration unit, and the advanced oxidation pretreatment unit are connected in sequence.

3. The mine water comprehensive treatment and resource utilization device according to claim 1, characterized in that, The deep processing unit also includes a microbial co-processing unit; in the deep processing unit, the capacitive deionization unit, the microbial co-processing unit, and the ion-enhanced adsorption unit are connected in sequence.

4. The mine water comprehensive treatment and resource utilization device according to claim 1, characterized in that, The selective electrodialysis unit is connected to the acid-base recycling and preparation unit; The reaction precipitation control unit is connected to the heavy metal safe curing unit.

5. The mine water comprehensive treatment and resource utilization device according to claim 1, characterized in that, The mine water integrated treatment and resource utilization device also includes a waste heat recovery unit; the waste heat recovery unit is connected to the membrane concentration integration unit, the bipolar membrane unit, the high-salt wastewater evaporation and crystallization unit, and the solid particle recovery and processing unit.

6. The mine water comprehensive treatment and resource utilization device according to claim 1, characterized in that, The mine water integrated treatment and resource utilization device also includes an emergency treatment buffer unit; the emergency treatment buffer unit is connected to the pretreatment unit, the deep treatment unit, the resource recovery unit, the pollutant safe disposal unit, the resource reuse unit, and the intelligent control unit.

7. The method of using the mine water comprehensive treatment and resource utilization device according to any one of claims 1 to 6, characterized in that, Includes the following steps: (1) The mine water is sequentially passed through a mechanical filtration unit to remove large particulate impurities, a mesoporous ceramic membrane filtration unit to remove colloidal particles, and then through an advanced oxidation pretreatment unit for preliminary degradation of organic matter to obtain pretreated mine water; large particulate impurities are sent to a solid waste sorting unit for sorting, the sorted coal sludge enters a solid particle recycling and processing unit, and the sorted salt sludge, chemical sludge and colloidal particles are sent to a heavy metal safety solidification unit for treatment; (2) The pretreated mine water enters the capacitor deionization unit for desalination treatment, and aeration is turned on to simultaneously carry out the electro-Fenton reaction; the desalinated water enters the ion-enhanced adsorption unit for purification; the waste resin generated by the ion-enhanced adsorption unit is sent to the heavy metal safety solidification unit for treatment; the purified water from the deep treatment unit is reused in stages through the staged wastewater reuse unit. (3) The concentrated brine generated by capacitor deionization is concentrated by the membrane concentration integration unit, and the concentrated solution enters the bipolar membrane feed water protection unit for pretreatment. The pretreated concentrated brine enters the bipolar membrane unit and is converted into a primary acid-base solution. Primary acid and alkali solutions are sent to the acid and alkali recycling and preparation unit; concentrated brine or waste liquid that cannot be directly recycled in the resource recovery unit enters the high-salt wastewater evaporation and crystallization unit for evaporation and crystallization treatment, and the crude salt obtained is sent to the solid particle recycling and processing unit for processing or sent to the salt product application unit for storage for future use. The intelligent control unit monitors the operating status of each unit, and the intelligent resource recycling matching unit adjusts the allocation of recycled materials.

8. The method of use according to claim 7, characterized in that, In step (1), the advanced oxidation pretreatment unit adopts a combination process of ozone oxidation and ultraviolet photocatalytic oxidation. The ozone dosage is 15~30mg / L, the ultraviolet wavelength is 254nm, and the treatment time is 20~40min. In step (2), the electrode used in the capacitor deionization unit is a CeO2-modified activated carbon electrode or a Co electrode. 0.5 Ni 0.5 Fe2O4 metal oxide electrode; In step (2), the aeration rate is 0.5~1.0 L / min; In step (2), the operating voltage of the desalination treatment is 1.2~1.6V, and the current density of the desalination treatment is 5~15mA / cm. 2 .

9. The method of use according to claim 7 or 8, characterized in that, In step (3), the membrane concentration integrated unit adopts a nanofiltration-reverse osmosis combined process, with the nanofiltration pressure being 1.5~2.5MPa and the reverse osmosis pressure being 2.5~3.5MPa; In step (3), the salt concentration of the concentrated solution is 15-20 wt%; In step (3), the hardness of the pretreated concentrated brine is <5 mg / L; In step (3), the current density of the bipolar film unit is 20~40 mA / cm². 2 The temperature of the bipolar film unit is 25~35℃.

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