Water resource recycling system in mining process and recycling method thereof

Abstract

The invention provides a water resource recycling system in a mining process and a recycling method thereof, and relates to the technical field of mining and mine wastewater utilization. The system comprises: a pretreatment module for collecting and removing suspended solids in wastewater and adjusting water quality to obtain pretreated water; the resource recovery module is used for recovering heavy metals and salts from the pretreated water and carrying out resourceful treatment on organic matters to obtain recovered water; the deep treatment module is used for degrading and recycling residual pollutants in water and further desalting to obtain treated water; the crystallization and solidification module is used for separating harmless salt and solidifying hazardous wastes from the treated water to obtain solidified bodies and discharge water reaching the standard; and the intelligent control module is used for monitoring operation parameters of each module in real time and carrying out dynamic optimization and early warning. The system realizes efficient recovery of heavy metals, salts and organic matters by aiming at complex wastewater containing heavy metals, high salts and organic matters generated by mining, and breaks through the limitation of traditional single resource recovery.

Description

Technical Field

[0001] This invention relates to the field of mining and wastewater utilization technology, specifically to a water resource recycling system and recycling method during mining. Background Technology

[0002] Against the backdrop of accelerating global industrialization, mining, as a fundamental industry, provides indispensable raw materials for numerous sectors. However, mining operations generate substantial amounts of wastewater. Water resource recycling technology integrates knowledge from multiple disciplines, including environmental engineering, materials science, and automation control. It aims to remove harmful substances from mining wastewater and recover valuable resources through a series of technological means, ensuring that the treated water meets mining production water or discharge standards, thereby achieving the goals of energy conservation, emission reduction, and green development.

[0003] Chinese invention patent CN104909497A discloses a method for treating acidic wastewater from non-ferrous metal mines. This method mainly consists of four steps: oxidation treatment, membrane treatment, sulfidation treatment, and neutralization treatment. In the treatment of acidic wastewater, ferrous ions are first oxidized to ferric ions using an oxidant or aeration method. Then, an iron precipitation reaction occurs. The clarified liquid after the reaction enters a membrane treatment system for separation and concentration. The concentrated liquid undergoes sulfidation precipitation treatment to recover valuable metals. The clarified liquid after the sulfidation reaction enters a neutralization treatment unit for neutralization and precipitation. Chinese utility model patent CN202968275U discloses a high-efficiency recycling device for mine wastewater, which includes a wastewater collection tank, a wastewater thickening sedimentation tank, and a return water sedimentation tank. These three tanks are arranged in a tiered manner and connected sequentially. The return water sedimentation tank is connected to water-using equipment via an output pump. This device utilizes a combination of wastewater collection tanks, wastewater thickening sedimentation tanks, and return water sedimentation tanks to deeply precipitate mine wastewater. However, in practice, the wastewater treatment devices or methods used in the aforementioned mining processes mostly focus on removing pollutants during the organic matter treatment process, neglecting the resource utilization of organic matter. They fail to convert the organic matter in the wastewater into usable energy or other valuable products, resulting in technical defects such as waste of organic matter resources, poor wastewater recycling efficiency, and the inability to effectively recover heavy metals and salts separately.

[0004] In view of this, it is necessary to study a water resource recycling system and its utilization method in the mining process to solve the above-mentioned technical problems. Summary of the Invention

[0005] In view of the technical problems existing in the background art, the present invention provides a water resource recycling system in the mining process, which effectively solves the technical problem that traditional water resource recycling systems in the mining process fail to convert organic matter in wastewater into usable energy or other valuable products in practical applications.

[0006] To achieve the above-mentioned objectives, the present invention is implemented through the following technical solution: In a first aspect, embodiments of the present invention provide a water resource recycling system for mining operations, comprising: The pretreatment module is used to collect and remove suspended solids from wastewater and adjust the water quality to obtain pretreated water; The resource recovery module is used to recover heavy metals and salts from pretreated water and to process organic matter into recycled water. The advanced treatment module is used to degrade and recycle residual pollutants in the water and further desalinate it to obtain treated water. The crystallization and solidification module is used to separate harmless salts and solidify hazardous waste from treated water, resulting in a safe-to-dispose solidified body and compliant effluent. The intelligent control module is electrically connected to the pretreatment module, resource recycling module, deep processing module, and crystallization and solidification module, respectively, and is used to monitor the operating parameters of each module in real time, and to perform dynamic optimization and fault warning. The pretreatment module, resource recycling module, deep processing module, and crystallization and solidification module are connected in sequence.

[0007] As a further improvement of the present invention, the intelligent control module includes a monitoring unit, a dynamic optimization unit, and an early warning unit; The monitoring unit is used to collect the operating parameters of each module in real time through sensors, including pH value, conductivity, heavy metal ion concentration, chemical oxygen demand, and water volume. The dynamic optimization unit is used to analyze and predict data collected by the monitoring unit using a long short-term memory network model combined with particle swarm optimization and genetic algorithms, and automatically adjust the parameters of each module, including the dosage of the agent, the rotation speed of the equipment, and the flow rate. The early warning unit is used to construct a digital twin model system, compare and analyze real-time monitoring data with the model, and use convolutional neural networks, recurrent neural networks, fault tree analysis and Bayesian network algorithms for fault diagnosis and early warning. When an anomaly occurs, information is issued in a timely manner, including audible and visual alarms, SMS notifications and email reminders.

[0008] As a further improvement of the present invention, the dynamic optimization unit includes a data processing subunit, a model training subunit, and a parameter adjustment subunit; The data processing subunit is used to preprocess the historical operating data collected by the monitoring unit, including data cleaning, normalization, and filtering operations. The model training subunit is used to train the long short-term memory network model using preprocessed data, optimize the model's hyperparameters (including learning rate and number of hidden layer neurons) using particle swarm optimization and genetic algorithms, evaluate the model's performance using cross-validation, and adjust the model parameters. The parameter adjustment subunit is used to adjust the operating parameters of each module according to the prediction results of the model training subunit. At the same time, it sets the upper and lower limits of parameter changes and the rate of change limit to prevent the parameters from being adjusted too much or too fast, which would lead to unstable operation, and establishes a manual intervention mechanism.

[0009] As a further improvement of the present invention, the parameter adjustment mechanism of the intelligent control module is as follows: When adjusting the operating parameters of each module, construct the module coupling coefficient matrix. Quantify the synergistic effect of parameter adjustments in each module, where matrix elements Indicates the first Adjusting the parameters of the first module affects the... The impact weight of each module's processing efficiency And calculate the dynamic adjustment amount based on the matrix: ; in: This includes a parameter adjustment vector, including pH adjustment reagent dosage, adsorption tower flow rate, evaporator temperature, RO membrane pressure, and MVR compression ratio; The optimal parameter vector predicted by the model; This is the current running parameter vector; The dynamic equilibrium coefficients optimized using the particle swarm optimization algorithm; The gradient vector, with water recovery rate, heavy metal recovery rate, and energy consumption as objective functions, drives parameter adjustment toward the system's optimal objective.

[0010] As a further improvement of the present invention, the pretreatment module includes a wastewater collection unit and a wastewater pretreatment unit; The wastewater collection unit is used to collect wastewater generated during the mining process; The wastewater pretreatment unit is used to pass the collected wastewater through a horizontal flow primary sedimentation tank, an inclined tube sedimentation device, and a fiber ball filter for primary sedimentation and filtration to remove large particulate suspended solids and impurities. At the same time, the pH value of the wastewater is adjusted to 6-9 by adding acid and alkali agents, and the wastewater temperature is adjusted to 20-30℃ by using a shell and tube heat exchanger to obtain pretreated water.

[0011] As a further improvement of the present invention, the resource recycling module includes a heavy metal recycling unit, a salt recycling unit, and an organic matter processing unit; The heavy metal recovery unit is used to adsorb and recover heavy metals in pretreated water through a functionalized MOFs adsorption tower. After adsorption saturation, it is desorbed using an acidic desorbent of 0.5-1.0 mol / L. Then, the desorbed heavy metal ions are reduced and deposited by electrochemical deposition. The heavy metals include copper, lead, and zinc. The salt recovery unit is used to evaporate and concentrate the pretreated water through a multi-effect evaporator system, and to separate salts in sequence. The salts include sodium sulfate and sodium chloride. Sodium sulfate crystallizes and precipitates in the first evaporator under controlled temperature of 70-80℃ and pH of 6-7. Sodium chloride crystallizes and precipitates in the subsequent evaporator under controlled temperature of 90-100℃ and pH of 7-8. The organic matter treatment unit is used to decompose and transform organic matter in pretreated water.

[0012] As a further improvement of the present invention, the organic matter treatment unit includes an ozone catalytic oxidation subunit, an anaerobic fermentation subunit, and a biogas collection and purification subunit connected in sequence. The ozone catalytic oxidation subunit is used in the ozone catalytic oxidation reaction tower to decompose ozone under the action of a catalyst to generate highly oxidizing hydroxyl radicals, thereby oxidizing and decomposing large molecular organic matter in wastewater into small molecular organic matter. The anaerobic fermentation subunit is used to introduce wastewater treated by ozone catalytic oxidation into the anaerobic fermentation tank, where anaerobic microorganisms decompose organic matter into biogas. The biogas collection and purification subunit is used to collect biogas produced by anaerobic fermentation through a water seal device, remove hydrogen sulfide by using an iron oxide desulfurizing agent in a desulfurization tower, and then remove moisture by using a silica gel desiccant in a dehydration device to obtain purified biogas.

[0013] As a further improvement of the present invention, the deep processing module includes a degradation unit and a desalination unit; The degradation unit is used to remove residual pollutants in the recycled water by passing the activated carbon filter through the biological activated carbon filter, utilizing the adsorption of activated carbon and the degradation of microorganisms, while controlling the filtration rate to be 8-12 m / h, the hydraulic retention time to be 1-2 h, and the dissolved oxygen concentration to be 2-4 mg / L. The desalination unit is used to further remove salt from the recycled water through the RO membrane system. The membrane module is arranged in a single-stage two- or three-stage configuration. The high-pressure pump is frequency-controlled and has a pressure range of 1.5-3.0 MPa.

[0014] As a further improvement of the present invention, the crystallization and solidification module includes a harmless salt separation unit and a solidified hazardous waste separation unit; The harmless salt separation unit is used to evaporate and concentrate the treated water through an MVR evaporator, causing harmless salt to crystallize and precipitate. The water is then separated by a hydrocyclone and a centrifuge, and a multi-stage countercurrent washing process is used to reduce the impurity content on the crystal surface. Finally, the water is dried by a vibrating fluidized bed dryer to obtain a qualified salt product. The solidified hazardous waste separation unit is used to mix hazardous waste from the treated water with cement and additives, stir evenly with a forced mixer, inject into a mold and cure under standard curing conditions to form a solid body, or use a chemical stabilization method, using a chelating agent to react with the hazardous waste to stabilize it.

[0015] Secondly, embodiments of the present invention provide a method for water resource recycling during mining operations, implemented based on the aforementioned water resource recycling system during mining operations, comprising the following steps: S1. The pretreatment module collects and removes suspended solids from the wastewater and adjusts the water quality to obtain pretreated water; S2. The resource recovery module recovers heavy metals and salts from the pretreated water and performs resource-based treatment on organic matter to obtain recycled water; S3. The residual pollutants in the water are degraded and recovered through the deep treatment module and further desalinated to obtain treated water; S4. Harmless salts and solidified hazardous waste are separated from the treated water through the crystallization and solidification module to obtain a safe-to-dispose solidified body and compliant effluent. S5. The intelligent control module monitors the operating parameters of each module in real time and performs dynamic optimization and fault warning.

[0016] Beneficial effects: 1. The water resource recycling system for mining operations provided by this invention includes a pretreatment module that precisely controls water quality to create optimal conditions for the subsequent MOFs adsorption tower for heavy metal recovery, preventing equipment blockage. The organic matter treatment unit uses ozone oxidation to break down large molecules into smaller molecules, improving the efficiency of anaerobic fermentation for biogas production, forming a "pollutant-energy" conversion chain with interconnected and synergistic steps. Furthermore, the ozone catalytic oxidation subunit oxidizes and decomposes large organic molecules in wastewater into smaller ones, while the anaerobic fermentation subunit uses anaerobic microorganisms to further decompose these smaller organic molecules into biogas. The biogas collection and purification subunit collects, desulfurizes, and dries the biogas to obtain purified biogas. This transforms the originally difficult-to-treat and polluting organic matter in wastewater into clean energy biogas, realizing the resource utilization of organic matter in mining wastewater. This solves the problem that traditional water resource recycling systems in mining operations fail to convert organic matter in wastewater into usable energy or other valuable products.

[0017] 2. The water resource recycling system for mining operations provided by this invention uses a heavy metal recovery unit to adsorb heavy metals from pretreated water. After desorption with an acidic desorbent, heavy metals are recovered via electrochemical deposition. A salt recovery unit separates sodium sulfate, sodium chloride, and other salts based on differences in salt solubility under different temperature and pH conditions, improving the purity of the salt products. An organic matter treatment unit converts large organic molecules into smaller molecules through ozone catalytic oxidation and anaerobic fermentation to generate biogas, which is then purified to obtain clean energy. This comprehensive system achieves efficient resource recovery and value-added utilization from wastewater, improving resource utilization efficiency and reducing dependence on external resources. Furthermore, heavy metal recovery utilizes specific MOFs adsorption to avoid interfering with salt crystallization; a multi-effect evaporator separates sodium sulfate and sodium chloride in temperature-segmented sections (70-80℃ / 90-100℃) to improve purity. After crystallization and solidification, the washed water is reused as pretreatment water, constructing a "impurity removal-resource separation-material recycling" system that achieves a dual improvement in efficiency and purity. The resource recovery process is synergistically optimized, breaking through the limitations of conventional combinations.

[0018] 3. The water resource recycling system provided by this invention for mining operations utilizes activated carbon adsorption and microbial degradation in a degradation unit to purify and recycle water, reducing residual pollutants. A desalination unit lowers the salinity of the water, improving water quality standards. A harmless salt separation unit obtains qualified salt products, achieving resource recovery. A solidified hazardous waste separation unit prevents secondary pollution. The degradation unit provides better influent water quality for the desalination unit, and the desalinated water facilitates harmless salt separation. The residual water after separation is safely disposed of by the solidified hazardous waste separation unit, thereby comprehensively improving water quality, recovering resources, ensuring environmental safety, and enhancing the efficiency and stability of the water resource recycling system. Furthermore, a biological activated carbon filter is used to control dissolved oxygen and inhibit membrane fouling, stabilizing RO desalination energy consumption at 1.5-3.0 MPa. The solidified hazardous waste unit solidifies residual hazardous materials using cement, forming a multi-level barrier of "degradation-desalination-safe disposal," improving water quality and preventing secondary pollution. This tiered treatment design ensures both water quality and safety.

[0019] 4. The water resource recycling system provided by this invention addresses the complex wastewater generated during mining operations, containing heavy metals, high salt content, and organic matter, rather than single-type wastewater (such as slaughterhouse wastewater, waste acid, saline wastewater, and membrane concentrate). It achieves efficient recovery of heavy metals (MOFs adsorption + electrochemical deposition), salts (temperature- and pH-dependent crystallization), and organic matter (biogas), overcoming the limitations of traditional single-resource recovery. Specifically, through "ozone oxidation → anaerobic fermentation → biogas recovery," pollutants are converted into energy; the entire process achieves heavy metal and salt recovery, solidifies hazardous waste into building materials, and ultimately ensures wastewater meets standards for reuse, constructing a zero-waste treatment system for mining wastewater. Furthermore, dynamic optimization is achieved through LSTM models and particle swarm optimization algorithms, linking pretreatment pH with resource recovery reagent dosage to improve efficiency; an early warning system predicts RO membrane fouling risk and triggers backwashing to extend membrane life; data-driven cross-module control forms a "monitoring-analysis-optimization" closed loop, surpassing simple equipment monitoring; intelligent control achieves dynamic coupling of the entire system, improving system efficiency and stability. By solidifying hazardous waste and deeply purifying water, we ensure that emissions meet standards and water resources are recycled, thus meeting the needs of green mining.

[0020] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0021] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0022] Figure 1 This is a schematic diagram of the water resource recycling system in the mining process provided in an embodiment of the present invention; Figure 2 This is a schematic flowchart of a water resource recycling method during mining operations provided in an embodiment of the present invention. Detailed Implementation

[0023] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the invention, are intended to cover non-exclusive inclusion.

[0025] In the description of the embodiments of this invention, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this invention, "multiple" means two or more, unless otherwise explicitly defined.

[0026] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0027] In the description of the embodiments of this invention, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0028] In the description of the embodiments of the present invention, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0029] In the description of the embodiments of the present invention, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0030] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0031] To address the technical problems of traditional water resource recycling systems in mining operations, such as the inability to convert organic matter in wastewater into usable energy or other valuable products, and the inability to efficiently recover heavy metals, salts, and organic matter separately, this invention provides a water resource recycling system and method for mining operations. This system addresses the complex wastewater generated from mining, containing heavy metals, high salt content, and organic matter, achieving efficient recovery of heavy metals (MOFs adsorption + electrochemical deposition), salts (temperature- and pH-dependent crystallization), and organic matter (biogas), overcoming the limitations of traditional single-resource recovery. Specifically, through "ozone oxidation → anaerobic fermentation → biogas recovery," pollutants are converted into energy; heavy metal and salt recovery is achieved throughout the entire process; hazardous waste is solidified into building materials; and finally, the wastewater meets standards for reuse, constructing a zero-waste treatment system for mining wastewater.

[0032] Example 1 Please see Figure 1 As shown in the figure, this embodiment of the invention provides a water resource recycling system for mining operations, mainly comprising: a pretreatment module, a resource recovery module, a deep treatment module, a crystallization and solidification module, and an intelligent control module. The intelligent control module is electrically connected to the pretreatment module, resource recovery module, deep treatment module, and crystallization and solidification module, respectively. Furthermore, the pretreatment module, resource recovery module, deep treatment module, and crystallization and solidification module are connected sequentially.

[0033] In some specific embodiments, the pretreatment module is mainly used to collect and remove suspended solids from mining wastewater and adjust the water quality to obtain pretreated water.

[0034] The pretreatment module includes a wastewater collection unit and a wastewater pretreatment unit.

[0035] The wastewater collection unit is used to collect wastewater generated during the mining process. The wastewater pretreatment unit is used to pass the collected wastewater through a horizontal flow primary sedimentation tank, an inclined tube sedimentation device, and a fiber ball filter for primary sedimentation and filtration to remove large suspended solids and impurities. At the same time, the pH value of the wastewater is adjusted to 6-9 by adding acid and alkali agents, and the wastewater temperature is adjusted to 20-30℃ by using a shell-and-tube heat exchanger to obtain pretreated water.

[0036] Specifically, by collecting and removing suspended solids from wastewater and adjusting the water quality, pretreated water is obtained. Based on the principles of sedimentation, filtration, acid-base neutralization, and heat exchange, suspended solids are removed using gravity sedimentation in a horizontal flow primary sedimentation tank, shallow sedimentation in an inclined tube sedimentation device, and interception filtration by a fiber ball filter. The pH value is adjusted according to the acid-base neutralization reaction, and the temperature is regulated by heat conduction through a shell-and-tube heat exchanger. This reduces the interference of impurities in the wastewater on subsequent treatment processes, ensures the normal operation of subsequent treatment equipment, and achieves preliminary purification of wastewater quality, laying the foundation for resource recovery and advanced treatment.

[0037] The resource recovery module is mainly used to recover heavy metals and salts from pretreated water and to process organic matter into recycled water.

[0038] The resource recycling module includes a heavy metal recycling unit, a salt recycling unit, and an organic matter processing unit.

[0039] The heavy metal recovery unit is used to adsorb and recover heavy metals in pretreated water through a functionalized MOFs adsorption tower. After adsorption saturation, it is desorbed using an acidic desorbent of 0.5-1.0 mol / L. The desorbed heavy metal ions are then reduced and deposited through electrochemical deposition. The heavy metals include copper, lead, zinc, etc.

[0040] The salt recovery unit is used to evaporate and concentrate the pretreated water through a multi-effect evaporator system, and to separate salts in sequence, including sodium sulfate and sodium chloride. Sodium sulfate crystallizes out in the first multi-effect evaporator at a controlled temperature of 70-80℃ and a pH of 6-7, while sodium chloride crystallizes out in the subsequent multi-effect evaporator at a controlled temperature of 90-100℃ and a pH of 7-8. The organic matter treatment unit is used to decompose and transform the organic matter in the pretreated water.

[0041] Specifically, by recovering heavy metals and salts from pretreated water and treating organic matter for resource recovery, recycled water is obtained. Heavy metals are then recovered through the specific adsorption of heavy metal ions by a functionalized MOF adsorption tower, the chemical reaction of an acidic desorbent, and the redox reaction of electrochemical deposition. Based on the differences in solubility of salts at different temperatures and pH values, salt crystallization and separation are achieved through heat transfer and evaporation concentration using a multi-effect evaporator. Organic matter is decomposed and transformed using ozone catalytic oxidation and anaerobic microbial metabolism. This process effectively recovers and utilizes valuable resources from wastewater, reduces resource waste, achieves resource value-added and economic benefits, and simultaneously reduces the potential environmental hazards of wastewater.

[0042] The organic matter treatment unit includes an ozone catalytic oxidation subunit, an anaerobic fermentation subunit, and a biogas collection and purification subunit.

[0043] The ozone catalytic oxidation subunit is used in the ozone catalytic oxidation reaction tower to decompose ozone under the action of a catalyst to generate highly oxidizing hydroxyl radicals, thereby oxidizing and decomposing large molecular organic matter in wastewater into small molecular organic matter.

[0044] The anaerobic fermentation subunit is used to introduce wastewater treated by ozone catalytic oxidation into the anaerobic fermentation tank, where anaerobic microorganisms decompose organic matter into biogas.

[0045] The biogas collection and purification subunit is used to collect biogas produced by anaerobic fermentation through a water seal device, remove hydrogen sulfide by using an iron oxide desulfurizing agent in a desulfurization tower, and then remove moisture by using a silica gel desiccant in a dehydration device to obtain purified biogas.

[0046] Specifically, by decomposing and transforming organic matter in pretreated water, and leveraging the strong oxidizing properties of hydroxyl radicals generated by ozone under catalysis, large organic molecules are oxidized into smaller molecules. The metabolic activities of anaerobic microorganisms in an anaerobic environment are then used to convert these smaller organic molecules into biogas. Finally, biogas is purified through physicochemical processes such as water sealing, desulfurization, and dehydration. This process effectively transforms previously difficult-to-treat organic pollutants in wastewater into usable energy—biogas, achieving waste resource utilization, reducing the environmental pollution load of organic pollutants, and simultaneously helping mines reduce energy costs and improve energy efficiency.

[0047] The advanced treatment module is mainly used to degrade and recycle residual pollutants in the water and further desalinate it to obtain treated water.

[0048] The deep processing module includes a degradation unit and a desalination unit.

[0049] The degradation unit is used to remove residual pollutants in the recycled water by passing the activated carbon filter through the biological activated carbon filter, utilizing the adsorption of activated carbon and the degradation of microorganisms, while controlling the filtration rate to be 8-12 m / h, the hydraulic retention time to be 1-2 h, and the dissolved oxygen concentration to be 2-4 mg / L.

[0050] The desalination unit is used to further remove salt from the recycled water through the RO membrane system. The membrane module is arranged in a single-stage two- or three-stage configuration. The high-pressure pump is frequency-controlled and has a pressure range of 1.5-3.0 MPa.

[0051] Specifically, treated water is obtained by degrading and recovering residual pollutants in the water and further desalinizing it. The residual pollutants are removed by the physical adsorption of activated carbon in the biological activated carbon filter and the biodegradation of microorganisms. By utilizing the semi-permeable membrane characteristics of the RO membrane, salt is separated from water under high pressure to achieve desalination. This results in the recycled water meeting higher standards and the water quality standards for mining production or discharge. It realizes the efficient recycling of water resources, reduces dependence on fresh water resources, and lowers the cost of water resource procurement.

[0052] The crystallization and solidification module is mainly used to separate harmless salts and solidify hazardous waste from treated water to obtain a safe-to-dispose solidified body and compliant effluent.

[0053] The crystallization and solidification module includes a harmless salt separation unit and a solidified hazardous waste separation unit.

[0054] The harmless salt separation unit is used to evaporate and concentrate the treated water through an MVR evaporator, causing harmless salt to crystallize and precipitate. The crystals are then separated by a hydrocyclone and a centrifuge, and a multi-stage countercurrent washing process is used to reduce the impurity content on the crystal surface. Finally, the water is dried by a vibrating fluidized bed dryer to obtain a qualified salt product.

[0055] The solidified hazardous waste separation unit is used to mix hazardous waste from the treated water with cement and additives, stir evenly with a forced mixer, inject into a mold and cure under standard curing conditions to form a solid body, or use a chemical stabilization method, using a chelating agent to react with the hazardous waste to stabilize it.

[0056] Specifically, by separating harmless salts and solidifying hazardous waste from treated water, safe solidified substances and compliant effluent are obtained. Harmless salts are separated and purified through evaporation and concentration using an MVR evaporator, centrifugal separation using a hydrocyclone and centrifuge, physical cleaning using multi-stage countercurrent washing, and thermal drying using a vibrating fluidized bed dryer. Based on the principles of cement solidification and chemical stabilization, hazardous waste is transformed into a stable solid form, thereby converting harmful substances in the treated water into a stable solid form and preventing secondary pollution to the environment. This achieves safe waste disposal, while the separated harmless salts can be further utilized as industrial raw materials, improving resource utilization efficiency.

[0057] The intelligent control module is mainly used to monitor the operating parameters of each module in real time, and to perform dynamic optimization and fault warning.

[0058] The intelligent control module includes a monitoring unit, a dynamic optimization unit, and an early warning unit.

[0059] The monitoring unit is used to collect the operating parameters of each module in real time through sensors, including pH value, conductivity, heavy metal ion concentration, chemical oxygen demand, and water volume.

[0060] The dynamic optimization unit is used to analyze and predict data collected by the monitoring unit using a long short-term memory network model combined with particle swarm optimization and genetic algorithms, and automatically adjust the parameters of each module, including the dosage of the reagent, the rotation speed of the equipment, and the flow rate.

[0061] The early warning unit is used to construct a digital twin model system, compare and analyze real-time monitoring data with the model, and use convolutional neural networks, recurrent neural networks, fault tree analysis and Bayesian network algorithms for fault diagnosis and early warning. When an anomaly occurs, information is issued in a timely manner, including audible and visual alarms, SMS notifications and email reminders.

[0062] In some specific implementations, the dynamic optimization unit includes a data processing subunit, a model training subunit, and a parameter adjustment subunit.

[0063] The data processing subunit is used to preprocess the historical operational data collected by the monitoring unit, including data cleaning, normalization, and filtering.

[0064] The model training subunit is used to train the Long Short-Term Memory Network model using preprocessed data, optimize the model's hyperparameters (including learning rate and number of hidden layer neurons) using particle swarm optimization and genetic algorithms, evaluate the model's performance using cross-validation, and adjust the model parameters.

[0065] The parameter adjustment subunit is used to adjust the operating parameters of each module according to the prediction results of the model training subunit. At the same time, it sets the upper and lower limits of parameter changes and the rate of change limit to prevent the parameters from being adjusted too much or too fast, which would lead to unstable operation, and establishes a manual intervention mechanism.

[0066] Specifically, by monitoring the operating parameters of each module in real time and performing dynamic optimization and fault early warning, the system utilizes sensor signal acquisition, data processing algorithms to analyze historical data, intelligent model prediction, and algorithm fault diagnosis to achieve intelligent control of the system. This ensures that the entire water resource recycling system is always in optimal operating condition, promptly detects and resolves potential faults, realizes intelligent and efficient management of system operation, and improves the system's stability and reliability.

[0067] The parameter adjustment mechanism of the intelligent control module is as follows: When adjusting the operating parameters of each module, construct the module coupling coefficient matrix. Quantify the synergistic effect of parameter adjustments in each module, where matrix elements Indicates the first Adjusting the parameters of the first module affects the... The impact weight of each module's processing efficiency And calculate the dynamic adjustment amount based on the matrix: ; in: This includes a parameter adjustment vector, including pH adjustment reagent dosage, adsorption tower flow rate, evaporator temperature, RO membrane pressure, and MVR compression ratio; The optimal parameter vector predicted by the model; This is the current running parameter vector; The dynamic equilibrium coefficients optimized using the particle swarm optimization algorithm; The gradient vector, with water recovery rate, heavy metal recovery rate, and energy consumption as objective functions, drives parameter adjustment toward the system's optimal objective.

[0068] Specifically, by introducing the module coupling coefficient matrix and the dynamic adjustment calculation formula, the parameter synergy effect of modules such as pretreatment, resource recovery, deep treatment, and crystallization solidification in the mine wastewater treatment system is quantified. This enables the dynamic optimization unit to make global optimal adjustments based on real-time data from multiple modules, integrating model predictions, current operating parameters, and objective function gradients to improve the system's resource recovery rate and operating efficiency.

[0069] Wherein, the module coupling coefficient matrix elements , indicating the first Adjusting the parameters of the first module affects the... The impact weight of each module's processing efficiency, and its value range is: Positive values ​​represent cooperative gain, while negative values ​​represent interference loss. These matrix elements were obtained through analysis of a large amount of historical operational data.

[0070] For example, collect the system's operating data under different operating conditions over the past year, including parameters such as the pH adjustment reagent dosage in the pretreatment module, the MOFs adsorption tower flow rate and evaporator temperature in the resource recovery module, the RO membrane system pressure in the deep treatment module, and the MVR evaporator compression ratio in the crystallization and solidification module, as well as the corresponding treatment efficiency indicators for each module (such as heavy metal recovery rate, water resource recovery rate, etc.).

[0071] By employing data analysis methods (such as correlation analysis and regression analysis), the impact of adjusting each parameter on the processing efficiency of other modules is determined, thereby obtaining matrix elements. The value of .

[0072] For example, analysis revealed that pH adjustment in the pretreatment module has a positive impact on the heavy metal adsorption efficiency of the resource recovery module, which can be determined. It is a positive value and is assigned a corresponding numerical value according to the degree of influence.

[0073] Furthermore, when the intelligent control module adjusts parameters, the matrix... This is used to quantify the interactions between modules. For example, when adjusting the RO membrane system pressure in the deep processing module, it's necessary to consider not only the impact of this parameter on the desalination efficiency of this module, but also the influence of the matrix. Consider its impact on other modules (such as pH adjustment in the pretreatment module, adsorption and evaporation processes in the resource recovery module, etc.).

[0074] Assuming the RO membrane system pressure needs to be adjusted, according to the matrix... It can be seen that it has a certain impact on the pH adjustment of the pretreatment module. Therefore, when adjusting the pressure of the RO membrane system, it is necessary to simultaneously consider fine-tuning the dosage of pH adjustment reagent in the pretreatment module to ensure the stable operation of the entire system.

[0075] According to the dynamic adjustment calculation formula Calculate the pressure adjustment amount of the RO membrane system. And the pH adjustment agent dosage in the pretreatment module Temperature adjustment of evaporator in resource recovery module .

[0076] During the adjustment process, the dynamic balance coefficient and The system will make real-time adjustments based on the optimization results of the particle swarm optimization algorithm to ensure that the parameter adjustments take into account the coupling effects between modules and are directed towards improving system objectives (such as water resource recovery rate, heavy metal recovery rate, and energy consumption reduction).

[0077] objective function gradient vector Using water resource recovery rate, heavy metal recovery rate, and energy consumption as objective functions, the sensitivity of parameter adjustments to system objectives is characterized. When calculating the gradient vector of the objective function, the specific form of the objective function is first determined, such as constructing an objective function using water resource recovery rate, heavy metal recovery rate, and energy consumption. Then, the gradient vector is obtained by taking the partial derivatives of the objective function. .

[0078] During parameter adjustment, the gradient vector Used to determine the direction of parameter adjustments, ensuring that adjustments are always made in a way that improves system objectives (such as maximizing water resource recovery rate, heavy metal recovery rate, and minimizing energy consumption). Dynamic balance coefficient and The optimal solution is determined using the particle swarm optimization (PSO) algorithm. The PSO algorithm continuously searches the solution space to find the solution that allows the system to reach its optimal operating state. and value.

[0079] During system operation, the particle swarm optimization algorithm continuously adjusts based on real-time monitoring data and the system objective function (such as water resource recovery rate, heavy metal recovery rate, energy consumption, etc.). and The value of is adjusted to adapt to different operating conditions. For example, when the system focuses more on improving water resource recovery rate, the particle swarm optimization algorithm will adjust ... and The value of makes parameter adjustments more inclined to improve water resource recovery rates.

[0080] Example 2 Please see Figure 2 As shown, the water resource recycling method in the mining process provided by the present invention, based on the aforementioned water resource recycling system in the mining process, includes the following steps: S1. The pretreatment module collects and removes suspended solids from the wastewater and adjusts the water quality to obtain pretreated water; The specific process of step S1 is as follows: Wastewater generated during mining is collected through the wastewater collection unit of the pretreatment module. The wastewater collection unit can be a large collection tank with anti-leakage function, and the tank body is made of high-density polyethylene (HDPE). The collection tank is equipped with multiple water inlets, distributed near various mining areas to ensure that the wastewater can be collected in a timely manner. The collected wastewater enters the wastewater pretreatment unit.

[0081] The wastewater pretreatment unit sequentially flows wastewater through a horizontal flow primary sedimentation tank, utilizing gravity sedimentation principles with a sedimentation time controlled at 2-4 hours to remove most large suspended solids. The wastewater then enters an inclined tube sedimentation device, where shallow sedimentation theory is applied, with the wastewater flow rate controlled at 0.5-0.8 mm / s to further remove fine suspended solids. Finally, it passes through a fiber ball filter at a flow rate of 15-20 m / h, achieving an effluent turbidity of <5 NTU. Simultaneously, the wastewater pretreatment unit uses a pH sensor to monitor the pH value in real time and an automatic dosing device to add acid and alkali reagents, adjusting the pH to 6-9. A shell-and-tube heat exchanger, with temperature sensor feedback adjustment, maintains the wastewater temperature at 20-30℃, resulting in pretreated water.

[0082] S2. The resource recovery module recovers heavy metals and salts from the pretreated water and performs resource-based treatment on organic matter to obtain recycled water; The specific process of step S2 is as follows: Pretreated water is introduced into the resource recovery module. In the heavy metal recovery unit, the pretreated water flows through the functionalized MOFs adsorption tower at a flow rate of 0.5-1.5 BV / h to adsorb heavy metal ions. After adsorption saturation, it is desorbed countercurrently with 0.5-1.0 mol / L acidic desorbent. The desorbed heavy metal ions enter the electrochemical deposition tank. By controlling the tank voltage at 1-2V and the current density at 10-20A / m², reduction deposition is carried out to recover heavy metals. The treated water enters the salt recovery unit. The salt recovery unit performs multi-effect evaporation on the pretreated water. Taking a triple-effect evaporator as an example, by rationally configuring the structure and operating parameters of each effect evaporator, the heat is utilized in stages. In the first evaporator, the temperature is controlled at 70-80℃ and the pH is adjusted to 6-7 to promote the crystallization of sodium sulfate. In subsequent evaporators, the temperature is adjusted to 90-100℃ and the pH is adjusted to 7-8 to promote the crystallization of sodium chloride. The water after salt separation enters the organic matter treatment unit. In the organic matter treatment unit, the wastewater first passes through the ozone catalytic oxidation subunit. In the ozone catalytic oxidation reaction tower, ozone decomposes under the action of catalysts such as MnO2 / γ-Al2O3 to generate hydroxyl radicals. The wastewater is then in countercurrent contact with ozone for 15-30 minutes, oxidizing and decomposing large molecular organic matter. The treated water then enters the anaerobic fermentation subunit. In the anaerobic fermentation tank, the temperature is controlled at 35-38℃, the pH value is maintained at 6.8-7.2, the oxidation-reduction potential is adjusted at -150-300mV, and the hydraulic retention time is maintained at 15-20 days. Anaerobic microorganisms decompose the organic matter into biogas. The generated biogas is collected through a water seal device in the biogas collection and purification subunit. It then passes through a desulfurization tower to remove hydrogen sulfide using an iron oxide desulfurizing agent, and then through a dehydration device to remove moisture using a silica gel desiccant, resulting in purified biogas. At the same time, the fermentation liquid and the water after biogas separation are mixed to form recycled water, which enters the deep treatment module.

[0083] S3. The residual pollutants in the water are degraded and recovered through the deep treatment module and further desalinated to obtain treated water; The specific process of step S3 is as follows: In the degradation unit of the deep treatment module, the recycled water passes through the biological activated carbon filter at a filtration rate of 8-12 m / h, with a hydraulic retention time of 1-2 h. The dissolved oxygen concentration is maintained at 2-4 mg / L by an online DO monitor. Residual pollutants are removed by activated carbon adsorption and microbial degradation. The treated water enters the desalination unit and passes through the RO membrane system. The membrane modules are arranged in a single stage with two or three stages. The high-pressure pump is frequency-controlled to maintain the pressure at 1.5-3.0 MPa for further desalination to obtain treated water.

[0084] S4. Harmless salts and solidified hazardous waste are separated from the treated water through the crystallization and solidification module to obtain a safe-to-dispose solidified body and compliant effluent. The specific process of step S4 is as follows: In the harmless salt separation unit of the crystallization and solidification module, the treated water is evaporated and concentrated through an MVR evaporator. By reasonably controlling parameters such as the heating power, feed flow rate, discharge rate, and compressor working status of the evaporator, harmless salt crystals are precipitated. The crystal slurry is initially separated by a hydrocyclone and then further separated by a centrifuge. A multi-stage countercurrent washing process is adopted, using the condensate after desalination as the washing water. Finally, the water is dried by a vibrating fluidized bed dryer to obtain qualified salt products. The remaining water is discharged as effluent after meeting the standards. In the solidification hazardous waste separation unit, the hazardous waste in the treated water is mixed with cement and additives at a ratio of 20%-30% cement and 5%-10% additives. The mixture is stirred in a forced mixer for no less than 15 minutes and poured into a mold. It is cured for 7-14 days under standard curing conditions of 20±2℃ and humidity above 95% to form a solid body. Alternatively, a chemical stabilization method is adopted. The chelating agent is selected according to the type and content of heavy metals in the hazardous waste, and the reaction time is controlled at 2-4 hours to stabilize the hazardous waste. The treated water is discharged as effluent after meeting the standards.

[0085] S5. The intelligent control module monitors the operating parameters of each module in real time and performs dynamic optimization and fault warning.

[0086] The specific process of step S5 is as follows: The intelligent control module intervenes throughout the process. The monitoring unit installs sensors at key nodes of each module, such as pH sensor with an accuracy of ±0.005 and conductivity sensor with an accuracy of ±0.5%FS, to collect the operating parameters of each module in real time and transmit them to the data acquisition and transmission system via RS485 or Profibus-DP protocol. The dynamic optimization unit preprocesses the collected data and uses a long short-term memory network model combined with particle swarm optimization and genetic algorithms for analysis and prediction. It automatically adjusts the operating parameters of each module, such as the dosage of reagents, equipment speed and flow rate, while setting parameter change limits and establishing a manual intervention mechanism. The early warning unit constructs a digital twin model system, compares the real-time monitoring data with the model, and uses convolutional neural networks, recurrent neural networks, fault tree analysis and Bayesian network algorithms for fault diagnosis and early warning. When an anomaly occurs, it promptly alerts relevant personnel through audible and visual alarms, SMS notifications and emails.

[0087] In summary, this invention provides a water resource recycling system and method for mining operations, relating to the fields of mining and wastewater utilization. The system includes: a pretreatment module for collecting and removing suspended solids and adjusting water quality in wastewater to obtain pretreated water; a resource recovery module for recovering heavy metals and salts from the pretreated water and treating organic matter for resource recovery to obtain recycled water; a deep treatment module for degrading residual pollutants in the recycled water and further desalinating it to obtain treated water; a crystallization and solidification module for separating harmless salts and solidifying hazardous waste from the treated water to obtain safely disposed solidified material and compliant effluent; and an intelligent control module for real-time monitoring of the operating parameters of each module, dynamic optimization, and fault warning. This system addresses the complex wastewater from mining operations containing heavy metals, high salt content, and organic matter, achieving efficient recovery of heavy metals (MOFs adsorption + electrochemical deposition), salts (temperature- and pH-dependent crystallization), and organic matter (biogas), breaking through the limitations of traditional single-resource recovery methods. It also achieves dynamic optimization through LSTM model and particle swarm optimization algorithm, linking pretreatment pH value with the amount of resource recovery agent added to improve efficiency; through hazardous waste solidification and deep water purification, it ensures compliance with discharge standards and water resource recycling, meeting the needs of green mining.

[0088] It should be noted that the present invention is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments that have the same structure and perform the same effects as the technical concept within the scope of the present invention are included within the scope of the present invention. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of the present invention, are also included within the scope of the present invention.

Claims

1. A water resource recycling system for mining operations, characterized in that, include: The pretreatment module is used to collect and remove suspended solids from wastewater and adjust the water quality to obtain pretreated water; The resource recovery module is used to recover heavy metals and salts from pretreated water and to process organic matter into recycled water. The advanced treatment module is used to degrade and recycle residual pollutants in the water and further desalinate it to obtain treated water. The crystallization and solidification module is used to separate harmless salts and solidify hazardous waste from treated water, resulting in a safe-to-dispose solidified body and compliant effluent. The intelligent control module is electrically connected to the pretreatment module, resource recycling module, deep processing module, and crystallization and solidification module, respectively, and is used to monitor the operating parameters of each module in real time, and to perform dynamic optimization and fault warning. The pretreatment module, resource recycling module, deep processing module, and crystallization and solidification module are connected in sequence.

2. The water resource recycling system during mining operations according to claim 1, characterized in that, The intelligent control module includes a monitoring unit, a dynamic optimization unit, and an early warning unit; The monitoring unit is used to collect the operating parameters of each module in real time through sensors, including pH value, conductivity, heavy metal ion concentration, chemical oxygen demand, and water volume. The dynamic optimization unit is used to analyze and predict data collected by the monitoring unit using a long short-term memory network model combined with particle swarm optimization and genetic algorithms, and automatically adjust the parameters of each module, including the dosage of the agent, the rotation speed of the equipment, and the flow rate. The early warning unit is used to construct a digital twin model system, compare and analyze real-time monitoring data with the model, and use convolutional neural networks, recurrent neural networks, fault tree analysis and Bayesian network algorithms for fault diagnosis and early warning. When an anomaly occurs, information is issued in a timely manner, including audible and visual alarms, SMS notifications and email reminders.

3. The water resource recycling system during mining operations according to claim 2, characterized in that, The dynamic optimization unit includes a data processing subunit, a model training subunit, and a parameter tuning subunit; The data processing subunit is used to preprocess the historical operating data collected by the monitoring unit, including data cleaning, normalization, and filtering operations. The model training subunit is used to train the long short-term memory network model using preprocessed data, optimize the model's hyperparameters (including learning rate and number of hidden layer neurons) using particle swarm optimization and genetic algorithms, evaluate the model's performance using cross-validation, and adjust the model parameters. The parameter adjustment subunit is used to adjust the operating parameters of each module according to the prediction results of the model training subunit. At the same time, it sets the upper and lower limits of parameter changes and the rate of change limit to prevent the parameters from being adjusted too much or too fast, which would lead to unstable operation, and establishes a manual intervention mechanism.

4. The water resource recycling system during mining operations according to claim 3, characterized in that, The parameter adjustment mechanism of the intelligent control module is as follows: When adjusting the operating parameters of each module, construct the module coupling coefficient matrix. Quantify the synergistic effect of parameter adjustments in each module, where matrix elements Indicates the first Adjusting the parameters of the first module affects the... The impact weight of each module's processing efficiency The dynamic adjustment amount is calculated based on the matrix, as shown in the following formula: ； in: This includes a parameter adjustment vector, including pH adjustment reagent dosage, adsorption tower flow rate, evaporator temperature, RO membrane pressure, and MVR compression ratio; This is the optimal parameter vector predicted by the model; This is the current running parameter vector; The dynamic equilibrium coefficients optimized using the particle swarm optimization algorithm; The gradient vector, with water recovery rate, heavy metal recovery rate, and energy consumption as objective functions, drives parameter adjustment toward the system's optimal objective.

5. The water resource recycling system during mining operations according to claim 1, characterized in that, The pretreatment module includes a wastewater collection unit and a wastewater pretreatment unit; The wastewater collection unit is used to collect wastewater generated during the mining process; The wastewater pretreatment unit is used to pass the collected wastewater through a horizontal flow primary sedimentation tank, an inclined tube sedimentation device, and a fiber ball filter for primary sedimentation and filtration to remove large particulate suspended solids and impurities. At the same time, the pH value of the wastewater is adjusted to 6-9 by adding acid and alkali agents, and the wastewater temperature is adjusted to 20-30℃ by using a shell and tube heat exchanger to obtain pretreated water.

6. The water resource recycling system during mining operations according to claim 1, characterized in that, The resource recycling module includes a heavy metal recycling unit, a salt recycling unit, and an organic matter processing unit; The heavy metal recovery unit is used to adsorb and recover heavy metals in pretreated water through a functionalized MOFs adsorption tower. After adsorption saturation, it is desorbed using an acidic desorbent of 0.5-1.0 mol / L. Then, the desorbed heavy metal ions are reduced and deposited by electrochemical deposition. The heavy metals include copper, lead, and zinc. The salt recovery unit is used to evaporate and concentrate the pretreated water through a multi-effect evaporator system, and to separate salts in sequence. The salts include sodium sulfate and sodium chloride. Sodium sulfate crystallizes out in the first evaporator at a controlled temperature of 70-80℃ and a pH of 6-7. Sodium chloride crystallizes out in the subsequent evaporator at a controlled temperature of 90-100℃ and a pH of 7-8. The organic matter treatment unit is used to decompose and transform organic matter in pretreated water.

7. The water resource recycling system for mining operations according to claim 6, characterized in that, The organic matter treatment unit includes an ozone catalytic oxidation subunit, an anaerobic fermentation subunit, and a biogas collection and purification subunit connected in sequence. The ozone catalytic oxidation subunit is used in the ozone catalytic oxidation reaction tower to decompose ozone under the action of a catalyst to generate highly oxidizing hydroxyl radicals, thereby oxidizing and decomposing large molecular organic matter in wastewater into small molecular organic matter. The anaerobic fermentation subunit is used to introduce wastewater treated by ozone catalytic oxidation into the anaerobic fermentation tank, where anaerobic microorganisms decompose organic matter into biogas. The biogas collection and purification subunit is used to collect biogas produced by anaerobic fermentation through a water seal device, remove hydrogen sulfide by using an iron oxide desulfurizing agent in a desulfurization tower, and then remove moisture by using a silica gel desiccant in a dehydration device to obtain purified biogas.

8. The water resource recycling system during mining operations according to claim 1, characterized in that, The deep processing module includes a degradation unit and a desalination unit; The degradation unit is used to remove residual pollutants in the recycled water by passing the activated carbon filter through the biological activated carbon filter, utilizing the adsorption of activated carbon and the degradation of microorganisms, while controlling the filtration rate to be 8-12 m / h, the hydraulic retention time to be 1-2 h, and the dissolved oxygen concentration to be 2-4 mg / L. The desalination unit is used to further remove salt from the recycled water through the RO membrane system. The membrane module is arranged in a single-stage two- or three-stage configuration. The high-pressure pump is frequency-controlled and has a pressure range of 1.5-3.0 MPa.

9. The water resource recycling system during mining operations according to claim 1, characterized in that, The crystallization and solidification module includes a harmless salt separation unit and a solidified hazardous waste separation unit. The harmless salt separation unit is used to evaporate and concentrate the treated water through an MVR evaporator, causing harmless salt to crystallize and precipitate. The water is then separated by a hydrocyclone and a centrifuge, and a multi-stage countercurrent washing process is used to reduce the impurity content on the crystal surface. Finally, the water is dried by a vibrating fluidized bed dryer to obtain a qualified salt product. The solidified hazardous waste separation unit is used to mix hazardous waste from the treated water with cement and additives, stir evenly with a forced mixer, inject into a mold and cure under standard curing conditions to form a solid body, or use a chemical stabilization method, using a chelating agent to react with the hazardous waste to stabilize it.

10. A method for recycling water resources during mining operations, characterized in that, The implementation of the water resource recycling system during mining operations as described in any one of claims 1 to 9 includes the following steps: S1. The pretreatment module collects and removes suspended solids from the wastewater and adjusts the water quality to obtain pretreated water; S2. The resource recovery module recovers heavy metals and salts from the pretreated water and performs resource-based treatment on organic matter to obtain recycled water; S3. The residual pollutants in the water are degraded and recovered through the deep treatment module and further desalinated to obtain treated water; S4. Harmless salts and solidified hazardous waste are separated from the treated water through the crystallization and solidification module to obtain a safe-to-dispose solidified body and compliant effluent. S5. The intelligent control module monitors the operating parameters of each module in real time and performs dynamic optimization and fault warning.

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