Water environment-geothermal energy collaborative treatment integrated device and collaborative treatment method

Abstract

The application belongs to the technical field of water treatment and geothermal energy utilization, and specifically discloses a water environment-geothermal energy collaborative treatment integrated device and a collaborative treatment method. The device comprises a coaxial double-pipe heat exchanger, a multistage water treatment module, an energy recovery module and a storage pool. The input end of the outer pipe of the coaxial double-pipe heat exchanger is in communication with a geothermal fluid exploitation well, and the input end of the inner pipe is in communication with the cold side output end of the energy recovery module. The input end of the multistage water treatment module is in communication with the output end of the inner pipe of the coaxial double-pipe heat exchanger, and the output end of the multistage water treatment module is in communication with the hot side input end of the energy recovery module. The cold side input end of the energy recovery module is in communication with the output end of the storage pool. The input end of the storage pool is in communication with the output end of the outer pipe of the coaxial double-pipe heat exchanger. The application can not only reduce the energy consumption dependence of traditional water treatment, but also solve the pollution discharge of geothermal exploitation wastewater, and is suitable for scenarios such as medium and low temperature geothermal field wastewater treatment and geothermal heating system water replenishment purification.

Description

Technical Field

[0001] This invention belongs to the interdisciplinary field of water treatment and geothermal energy utilization, and discloses an integrated device and method for the coordinated treatment of water environment and geothermal energy. Background Technology

[0002] Traditional water treatment technologies rely on fossil fuels, resulting in high energy consumption and operating costs, making them difficult to implement in remote areas or geothermal development zones. Furthermore, geothermal fluid extraction carries large amounts of suspended solids, heavy metal ions, and organic pollutants. Direct discharge of these pollutants can cause soil and groundwater pollution, while reinjection can clog strata pores due to contaminants, affecting the long-term operation of the geothermal system.

[0003] In existing technologies, the integration of water treatment and geothermal energy is mostly limited to the level of single energy supply, such as using geothermal energy for heating to assist water treatment reactions, without forming a synergistic and optimized integrated design. This approach has the following shortcomings: First, the heat of the geothermal fluid is not fully utilized, resulting in low heat exchange efficiency and failure to meet the temperature requirements of the water treatment reaction; second, the water treatment module is not designed specifically for the compositional characteristics of the geothermal fluid, leading to poor removal of geothermal-specific pollutants; third, there is a lack of a circulation and control mechanism, resulting in poor system stability when the temperature and flow rate of the geothermal fluid fluctuate; and fourth, the treated water resources are not utilized in a closed loop with the geothermal system, causing resource waste.

[0004] Therefore, there is an urgent need to develop an integrated technology that can achieve efficient utilization of geothermal energy, targeted removal of pollutants, coordinated system regulation and resource recycling, in order to solve the dual challenges of current water environment management and geothermal development. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated device and method for the coordinated treatment of water environment and geothermal energy, in order to solve the technical problems that the combination of water treatment and geothermal energy is mostly limited to the single energy supply level, resulting in low geothermal energy utilization, poor removal of pollutants in geothermal fluids, poor system stability, and resource waste.

[0006] The first aspect of the present invention provides an integrated device for the coordinated treatment of water environment and geothermal energy, including a coaxial tube heat exchanger, a multi-stage water treatment module, an energy recovery module and a storage tank;

[0007] The input end of the outer tube of the coaxial tube heat exchanger is connected to the geothermal fluid extraction well, and the input end of the inner tube is connected to the cold side output end of the energy recovery module, which is used to heat the water to be treated in the inner tube using the geothermal fluid in the outer tube.

[0008] The input end of the multi-stage water treatment module is connected to the output end of the inner tube of the coaxial tube heat exchanger, and the output end of the multi-stage water treatment module is connected to the hot side input end of the energy recovery module. The multi-stage water treatment module is used to purify the water to be treated and to transport the purified water with residual heat to the energy recovery module.

[0009] The cold-side input end of the energy recovery module is connected to the output end of the storage tank, and is used to preheat the water to be treated input into the storage tank with the water to be treated containing waste heat, and to transport the preheated water to be treated to the inner tube of the coaxial tube heat exchanger.

[0010] The input end of the storage pool is connected to the output end of the outer tube of the coaxial tube heat exchanger.

[0011] Preferably, the multi-stage water treatment module includes a filtration unit, a temperature-sensitive catalytic oxidation unit, a modified adsorption unit, and a waste heat disinfection unit arranged sequentially along the water flow direction;

[0012] The filtration unit is used to filter out impurities from the water to be treated;

[0013] The temperature-sensitive catalytic oxidation unit is used to oxidize and decompose organic pollutants in the water to be treated;

[0014] The modified adsorption unit is used to adsorb heavy metal ions in the water to be treated;

[0015] The waste heat disinfection unit is used to keep the water to be treated warm and sterilize it.

[0016] Preferably, it further includes a cycle control module; the cycle control module includes a PLC controller and a temperature sensor and a flow control valve electrically connected to the PLC controller;

[0017] The temperature sensor is located at the water inlet of the temperature-sensitive catalytic oxidation unit;

[0018] The flow regulating valve is installed on the pipeline between the output end of the outer tube of the coaxial tube heat exchanger and the reinjection well.

[0019] The PLC controller is used to adjust the opening degree of the flow regulating valve according to the inlet temperature of the temperature-sensitive catalytic oxidation unit.

[0020] Preferably, the filter element pore size of the filter unit is 10μm-20μm.

[0021] Preferably, the catalyst used in the temperature-sensitive catalytic oxidation unit is a titanium-based supported cerium-manganese composite oxide catalyst, wherein the particle size of the titanium-based supported cerium-manganese composite oxide catalyst is 50μm-80μm, and the molar ratio of cerium to manganese is 3:7.

[0022] Preferably, the adsorbent used in the modified adsorption unit is a zeolite adsorbent loaded with nano-iron oxides, and the loading of nano-iron oxides is 0.8 mg / cm³. 2 -1.2mg / cm 2 .

[0023] Preferably, the waste heat disinfection unit includes an insulation layer and an ultraviolet lamp;

[0024] The insulation interlayer is made of aluminum silicate fiber, and the thickness of the insulation interlayer is 20mm-30mm.

[0025] A second aspect of the present invention provides a method for the synergistic treatment of water environment and geothermal energy, which utilizes the aforementioned integrated device for the synergistic treatment of water environment and geothermal energy, comprising:

[0026] The water to be treated in the storage tank is pumped to the cold side input terminal of the energy recovery module, and the water to be treated at the cold side input terminal is preheated by the water to be treated at the hot side input terminal of the energy recovery module.

[0027] The preheated water to be treated enters the coaxial tube heat exchanger through the cold side output end of the energy recovery module and is heated;

[0028] The heated water to be treated passes through a filtration unit, a temperature-sensitive catalytic oxidation unit, a modified adsorption unit, and a waste heat disinfection unit in sequence before entering the heat input terminal of the energy recovery module.

[0029] Preferably, the catalyst used in the temperature-sensitive catalytic oxidation unit is a titanium-based supported cerium-manganese composite oxide catalyst, and the preparation method of the titanium-based supported cerium-manganese composite oxide catalyst is as follows:

[0030] Step S11: Immerse the pretreated titanium sheet vertically into a 0.5 mol / L cerium-manganese precursor solution, treat it using the dip-pull method, and then air dry it.

[0031] Step S12: Place the titanium sheet obtained in step S11 into a muffle furnace and bake it in air at a temperature of 450℃-550℃ for 2-3 hours, then let it cool naturally to room temperature.

[0032] Step S13, repeat steps S11 and S12 until the thickness of the cerium-manganese coating reaches 15μm-20μm.

[0033] Preferably, the adsorbent used in the modified adsorption unit is a zeolite adsorbent supported on nano-iron oxides, and the preparation method of the zeolite adsorbent supported on nano-iron oxides is as follows:

[0034] Step S101: Prepare activated zeolite;

[0035] Step S102: Immerse the activated zeolite in ferrous sulfate solution and stir for 2-4 hours under nitrogen protection;

[0036] Step S103: The zeolite obtained in step S102 is heated to 600℃-700℃ at a rate of 10℃ / min under a nitrogen atmosphere and kept at that temperature for 1.5h-2h to prepare a zeolite adsorbent with a nano-iron oxide loading of 0.8mg / cm²-1.2mg / cm².

[0037] The integrated water environment-geothermal energy co-processing device and co-processing method of the present invention have the following advantages compared with the prior art:

[0038] The coaxial tube heat exchanger of this invention can achieve efficient heat exchange between geothermal fluid and water to be treated; the multi-stage water treatment module is sequentially equipped with a filtration unit, a temperature-sensitive catalytic oxidation unit, a modified adsorption unit, and a waste heat disinfection unit, which is adapted to geothermal low-temperature conditions and achieves targeted removal of pollutants; the energy recovery module recovers the waste heat of the fluid output from the multi-stage water treatment module and feeds it back to the preheating storage tank at the front end of the system before the water to be treated enters the energy recovery module; the circulation control module adjusts the temperature, pressure, and flow rate parameters in real time to ensure the coordinated operation of the system.

[0039] This invention, through the deep coupling of geothermal energy and water treatment, can reduce the energy dependence of traditional water treatment, solve the pollution discharge problem of geothermal extraction wastewater, and realize the geothermal reinjection and recycling of treated water resources. It features low energy consumption, high pollutant removal rate, strong system stability, and high resource utilization rate. It is suitable for wastewater treatment in medium and low temperature geothermal fields, water purification for geothermal heating systems, and drinking water preparation in remote areas. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the integrated water environment-geothermal energy co-processing device according to an embodiment of the present invention.

[0041] In the diagram: 1. Outer pipe; 2. Geothermal fluid extraction well; 3. Inner pipe; 4. Energy recovery module; 5. Storage tank; 6. Filtration unit; 7. Temperature-sensitive catalytic oxidation unit; 8. Modified adsorption unit; 9. Waste heat disinfection unit; 10. PLC controller; 11. Temperature sensor; 12. Flow regulating valve; 13. Ultraviolet lamp; 14. Pressure sensor; 15. Recharge pump; 16. Recharge well; 17. Purified water storage tank. Detailed Implementation

[0042] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0043] A first aspect of this invention provides an integrated device for the coordinated treatment of water environment and geothermal energy, such as... Figure 1 As shown, it includes a coaxial tube heat exchanger, a multi-stage water treatment module, an energy recovery module 4, and a storage tank 5.

[0044] The outer tube 1 of the coaxial tube heat exchanger is connected to the geothermal fluid extraction well 2 at its input end. The output end of the outer tube 1 is split into two paths: one connecting to the storage tank 5, and the other connecting to the reinjection well 16 via a bypass pipeline. The inner tube 3 of the coaxial tube heat exchanger is connected to the cold-side output end of the energy recovery module 4 at its input end, used to heat the water to be treated in the inner tube 3 using the geothermal fluid from the outer tube 1. In this embodiment, the outer tube 1 is made of 316L stainless steel, resistant to geothermal fluid corrosion; the inner tube 3 is made of polytetrafluoroethylene reinforced composite material, which is high-temperature resistant and smooth, preventing scaling. The outer wall of the inner tube 3 is provided with a spiral guide groove with a pitch of 20mm-30mm. The gap between the outer tube 1 and the inner tube 3 is 8mm-12mm, which enhances fluid turbulence and improves heat exchange efficiency to over 85%.

[0045] In this embodiment of the invention, the input end of the multi-stage water treatment module is connected to the output end of the inner tube 3 of the coaxial tube heat exchanger, and the output end of the multi-stage water treatment module is connected to the hot side input end of the energy recovery module 4. The multi-stage water treatment module is used to purify the water to be treated and to transport the purified water with residual heat to the energy recovery module 4.

[0046] The aforementioned multi-stage water treatment module includes a filtration unit 6, a temperature-sensitive catalytic oxidation unit 7, a modified adsorption unit 8, and a waste heat disinfection unit 9 arranged sequentially along the water flow direction.

[0047] The filter unit 6 is used to filter out impurities in the water to be treated. For example, the filter unit 6 has a built-in ceramic filter element with a pore size of 10μm-20μm, which can efficiently remove large particulate impurities such as suspended solids and silt in the water to be treated, and avoid clogging of subsequent modules.

[0048] The temperature-sensitive catalytic oxidation unit 7 is used to oxidize and decompose organic pollutants in the water to be treated. For example, the temperature-sensitive catalytic oxidation unit 7 incorporates a titanium-based supported cerium-manganese composite oxide catalyst with a particle size of 50μm-80μm and a cerium to manganese molar ratio of 3:7. This catalyst exhibits the highest catalytic activity at 30℃-60℃, which is suitable for the water temperature after geothermal heat exchange, enabling efficient oxidative decomposition of recalcitrant organic pollutants such as antibiotics and pesticides.

[0049] The modified adsorption unit 8 is used to adsorb heavy metal ions in the water to be treated. Exemplarily, the modified adsorption unit 8 contains a zeolite adsorbent loaded with nano-iron oxides, with a nano-iron oxide loading of 0.8 g / cm³. 2 -1.2mg / cm 2 For Pb 2+ Cd 2+ It has a saturated adsorption capacity of ≥15mg / g for heavy metal ions and strong adsorption selectivity.

[0050] The waste heat disinfection unit 9 is used to keep the water to be treated warm and sterilize it. For example, the waste heat disinfection unit 9 has a built-in ultraviolet lamp 13 with a power of 15W-25W and is equipped with a heat insulation layer. The heat insulation layer is filled with aluminum silicate fiber and the thickness of the layer is 20mm-30mm. It can maintain the temperature inside the unit at 45℃-55℃. Combined with ultraviolet irradiation, it can achieve efficient sterilization and reduce the energy consumption of the ultraviolet lamp 13.

[0051] In this embodiment of the invention, the energy recovery module 4 is a plate heat exchanger. The hot-side input of the energy recovery module 4 is connected to the waste heat disinfection unit 9, and the hot-side output is divided into two paths: one connected to the reinjection well 16, and the other connected to the purified water storage tank 17. The cold-side input of the energy recovery module 4 is connected to the output of the storage tank 5, and the cold-side output is connected to the input of the inner tube 3 of the coaxial tube heat exchanger. In this embodiment, the energy recovery module 4 is used to preheat the water to be treated input to the storage tank 5 using water with waste heat, and then transports the preheated water to the inner tube 3 of the coaxial tube heat exchanger. The energy recovery module 4 can recover the waste heat of the treated fluid, preheat the water to be treated, and reduce the energy consumption of the coaxial tube heat exchanger.

[0052] In this embodiment of the invention, the input end of the storage pool 5 is connected to the output end of the outer tube 1 of the coaxial tube heat exchanger, and the storage pool 5 is used to store geothermal fluid.

[0053] To address the issue of poor system stability when the temperature and flow rate of the geothermal fluid fluctuate, the integrated water environment-geothermal energy co-processing device of this embodiment further includes a circulation control module. The circulation control module includes a PLC controller 10 and a temperature sensor 11 and a flow regulating valve 12 electrically connected to the PLC controller 10. The temperature sensor 11 is located at the inlet and outlet of the temperature-sensitive catalytic oxidation unit 7. The flow regulating valve 12 is located on the bypass pipeline between the output end of the outer tube 1 of the coaxial tube heat exchanger and the reinjection well 16. The PLC controller 10 is used to regulate the opening degree of the flow regulating valve 12 on the bypass pipeline according to the inlet temperature of the temperature-sensitive catalytic oxidation unit 7. For example, a temperature threshold of 30℃-60℃ is set. When the inlet temperature of the temperature-sensitive catalytic oxidation unit 7 is higher than 60℃, the opening of the flow regulating valve 12 on the bypass pipeline is increased; when the temperature is lower than 30℃, the opening of the flow regulating valve 12 on the bypass pipeline is decreased, and the flow rate of the water to be treated is adjusted to 0.8m / s-1.2m / s to ensure stable system operation. The temperature sensor 11 in this embodiment can also be installed at the inlet and outlet of the coaxial tube heat exchanger to monitor the water temperature in real time. The flow regulating valve 12 can also be installed on the geothermal fluid pipeline, the water to be treated pipeline, and the bypass pipeline. To further ensure stable system operation, the circulation control module also includes a pressure sensor 14, which is installed at both ends of the modified adsorption unit 8 to monitor the filter element blockage.

[0054] A second aspect of the present invention provides a method for the synergistic treatment of water environment and geothermal energy, which utilizes the aforementioned integrated device for the synergistic treatment of water environment and geothermal energy, comprising:

[0055] Step 1: Pump the water to be treated in the storage tank 5 to the cold side input end of the energy recovery module 4. Use the water to be treated at the hot side input end of the energy recovery module 4 to preheat the water to be treated at the cold side input end, so that the water to be treated at the cold side input end is heated to 25℃-35℃.

[0056] Step 2: The preheated water to be treated enters the coaxial tube heat exchanger through the cold side output end of the energy recovery module 4 and is heated. Specifically, the preheated water to be treated exchanges heat with the geothermal fluid with a temperature of 80℃-150℃ in the outer tube 1 of the coaxial tube heat exchanger, and is heated to 30℃-60℃. The flow ratio of geothermal fluid to water to be treated is 1:2-3.

[0057] Step 3: The heated water to be treated passes through the filtration unit 6, the temperature-sensitive catalytic oxidation unit 7, the modified adsorption unit 8, and the waste heat disinfection unit 9 in sequence for purification before entering the hot side input terminal of the energy recovery module 4.

[0058] For example, the heated water to be treated is first filtered through a ceramic filter to remove suspended solids and impurities with a particle size ≥10μm; then, under the action of a cerium-manganese composite oxide catalyst, organic pollutants are oxidized and decomposed, with an organic pollutant removal rate ≥90%, of which antibiotic pollutants have a degradation rate ≥95% and pesticide pollutants have a degradation rate ≥92%; subsequently, heavy metal ions and residual pollutants are removed by adsorption through zeolite adsorbent; finally, sterilization and disinfection are achieved in an environment of 45℃-55℃ maintained by the heat insulation jacket, combined with ultraviolet irradiation, with a sterilization rate ≥99.9%, wherein the fluid residence time in the waste heat disinfection unit 9 is 15-20min.

[0059] After purification through the above steps, the water to be treated enters the heat-side input terminal of the energy recovery module 4. After releasing waste heat, it is divided into two paths: one path is used as purified water output, and the other path is pressurized by the reinjection pump 15 and injected into the reinjection well 16 to complete the geothermal system circulation. The reinjection ratio is 60%-80%, the suspended solids content in the reinjection water is ≤5mg / L, and the heavy metal ion concentration meets the Class I standard of "Geothermal Reinjection Water Quality Requirements" (GB / T 11615-2010).

[0060] In this embodiment of the invention, the catalyst used in the temperature-sensitive catalytic oxidation unit 7 is a titanium-based supported cerium-manganese composite oxide catalyst. The preparation method of the titanium-based supported cerium-manganese composite oxide catalyst is as follows:

[0061] Step S11: Vertically immerse the pretreated titanium sheet in a 0.5 mol / L cerium-manganese precursor solution, using the dip-pull method, and then air dry. The pulling speed in the dip-pull method is 5 mm / s to ensure the solution uniformly covers the titanium sheet surface. Air dry at room temperature for 1 hour.

[0062] Step S12: Place the titanium sheet obtained in step S11 into a muffle furnace and bake it in air at a temperature of 450℃-550℃ for 2-3 hours, then allow it to cool naturally to room temperature.

[0063] Step S13: Repeat steps S11 and S12 until the cerium-manganese coating reaches a thickness of 15μm-20μm and a specific surface area of ​​80m². 2 / g-120m 2 / g.

[0064] The pretreatment method for titanium sheets in this embodiment of the invention is as follows:

[0065] The titanium sheet was immersed in a 10% NaOH solution and bathed in a constant temperature water bath at 60℃ for 30 minutes. It was then degreased with ultrasonic treatment (power 200W). After removal, it was rinsed with deionized water until neutral and then air-dried. After air-drying, it was immersed in a 1:1 hydrofluoric acid-nitric acid mixture and soaked at room temperature for 10 minutes to remove the surface oxide layer. It was then rinsed three times with deionized water and dried with nitrogen gas to complete the pretreatment of the titanium sheet.

[0066] In this embodiment of the invention, the adsorbent used in the modified adsorption unit 8 is a zeolite adsorbent loaded with nano-iron oxides. The preparation method of the zeolite adsorbent loaded with nano-iron oxides is as follows:

[0067] Step S101, preparing activated zeolite, specifically:

[0068] Natural zeolite was placed in a 5% HCl solution and stirred at 80°C for 2 hours (200 rpm) to remove impurity ions and expand the pore size. It was then rinsed with deionized water until the pH reached 7 and dried at 105°C for 4 hours to obtain activated zeolite.

[0069] Step S102: Immerse the activated zeolite in ferrous sulfate solution and stir for 2-4 hours under nitrogen protection.

[0070] For example, 100g of activated zeolite was immersed in 500mL of 0.5mol / L FeSO4 solution, and stirred at 30°C for 3 hours under nitrogen protection (flow rate 50mL / min) to ensure Fe... 2+ Fully adsorbed.

[0071] Step S103: The zeolite obtained in step S102 is heated to 600℃-700℃ at a rate of 10℃ / min under a nitrogen atmosphere and kept at that temperature for 1.5h-2h to prepare a zeolite adsorbent with a nano-iron oxide loading of 0.8mg / cm²-1.2mg / cm².

[0072] For example, the zeolite obtained in step S102 is transferred to a tube furnace and heated to 650°C at a rate of 10°C / min under a nitrogen atmosphere, and held at that temperature for 1.5 hours to allow Fe to... 2+ The iron nanoparticles were oxidized to Fe2O3 nanoparticles and immobilized in the zeolite channels; after cooling, they were sieved to select particles of 2-3 mm, with the nano-iron loading controlled at 1.0±0.1 mg / cm³. 2 The resulting zeolite adsorbent loaded with nano-iron oxides showed improved performance against Pb. 2+ Cd 2+ The saturated adsorption capacity is ≥15mg / g.

[0073] The coaxial tube heat exchanger of this invention can achieve efficient heat exchange between geothermal fluid and water to be treated; the multi-stage water treatment module is sequentially equipped with a filtration unit 6, a temperature-sensitive catalytic oxidation unit 7, a modified adsorption unit 8, and a waste heat disinfection unit 9, which is adapted to geothermal low-temperature conditions and achieves targeted removal of pollutants; the energy recovery module 4 recovers the waste heat of the fluid output from the multi-stage water treatment module and feeds it back to the preheating storage tank 5 at the front end of the system and the water to be treated entering the energy recovery module 4; the circulation control module adjusts the temperature, pressure, and flow rate parameters in real time to ensure the coordinated operation of the system.

[0074] This invention deeply couples water treatment with geothermal energy, which can reduce the energy dependence of traditional water treatment, solve the pollution discharge problem of geothermal extraction wastewater, and realize the geothermal reinjection and recycling of treated water resources. It features low energy consumption, high pollutant removal rate, strong system stability and high resource utilization rate. It is suitable for wastewater treatment in medium and low temperature geothermal fields, water purification for geothermal heating systems and drinking water preparation in remote areas.

[0075] The above descriptions are merely a few embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any modifications or alterations made by those skilled in the art without departing from the scope of the technical solution of the present invention using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. An integrated device for the synergistic treatment of water environment and geothermal energy, characterized in that, It includes a coaxial tube heat exchanger, a multi-stage water treatment module, an energy recovery module, and a storage tank; The input end of the outer tube of the coaxial tube heat exchanger is connected to the geothermal fluid extraction well, and the input end of the inner tube is connected to the cold side output end of the energy recovery module, which is used to heat the water to be treated in the inner tube using the geothermal fluid in the outer tube. The input end of the multi-stage water treatment module is connected to the output end of the inner tube of the coaxial tube heat exchanger, and the output end of the multi-stage water treatment module is connected to the hot side input end of the energy recovery module. The multi-stage water treatment module is used to purify the water to be treated and to transport the purified water with residual heat to the energy recovery module. The cold-side input end of the energy recovery module is connected to the output end of the storage tank, and is used to preheat the water to be treated input into the storage tank with the water to be treated containing waste heat, and to transport the preheated water to be treated to the inner tube of the coaxial tube heat exchanger. The input end of the storage pool is connected to the output end of the outer tube of the coaxial tube heat exchanger; The multi-stage water treatment module includes a filtration unit, a temperature-sensitive catalytic oxidation unit, a modified adsorption unit, and a waste heat disinfection unit arranged sequentially along the water flow direction. The filtration unit is used to filter out impurities from the water to be treated; The temperature-sensitive catalytic oxidation unit is used to oxidize and decompose organic pollutants in the water to be treated; The modified adsorption unit is used to adsorb heavy metal ions in the water to be treated; The waste heat disinfection unit is used to keep the water to be treated warm and sterilize it.

2. The integrated water environment-geothermal energy co-processing device according to claim 1, characterized in that, It also includes a cycle control module; the cycle control module includes a PLC controller and a temperature sensor and a flow control valve electrically connected to the PLC controller. The temperature sensor is located at the water inlet of the temperature-sensitive catalytic oxidation unit; The flow regulating valve is installed on the pipeline between the output end of the outer tube of the coaxial tube heat exchanger and the reinjection well. The PLC controller is used to adjust the opening degree of the flow regulating valve according to the inlet temperature of the temperature-sensitive catalytic oxidation unit.

3. The integrated water environment-geothermal energy co-processing device according to claim 1, characterized in that, The filter element of the filter unit has a pore size of 10μm-20μm.

4. The integrated water environment-geothermal energy co-processing device according to claim 1, characterized in that, The catalyst used in the temperature-sensitive catalytic oxidation unit is a titanium-based supported cerium-manganese composite oxide catalyst with a particle size of 50μm-80μm and a molar ratio of cerium to manganese of 3:

7.

5. The integrated water environment-geothermal energy co-processing device according to claim 1, characterized in that, The adsorbent used in the modified adsorption unit is a zeolite adsorbent loaded with nano-iron oxides, and the loading of nano-iron oxides is 0.8 mg / cm²-1.2 mg / cm².

6. The integrated water environment-geothermal energy co-processing device according to claim 1, characterized in that, The waste heat disinfection unit includes an insulation layer and an ultraviolet lamp; The insulation interlayer is made of aluminum silicate fiber, and the thickness of the insulation interlayer is 20mm-30mm.

7. A method for synergistic treatment of water environment and geothermal energy, characterized in that, The integrated water environment-geothermal energy co-processing device according to any one of claims 1-6 comprises: The water to be treated in the storage tank is pumped to the cold side input terminal of the energy recovery module, and the water to be treated at the cold side input terminal is preheated by the water to be treated at the hot side input terminal of the energy recovery module. The preheated water to be treated enters the coaxial tube heat exchanger through the cold side output end of the energy recovery module and is heated; The heated water to be treated passes through a filtration unit, a temperature-sensitive catalytic oxidation unit, a modified adsorption unit, and a waste heat disinfection unit in sequence before entering the heat input terminal of the energy recovery module.

8. The water environment-geothermal energy synergistic treatment method according to claim 7, characterized in that, The catalyst used in the temperature-sensitive catalytic oxidation unit is a titanium-based supported cerium-manganese composite oxide catalyst, and the preparation method of the titanium-based supported cerium-manganese composite oxide catalyst is as follows: Step S11: Immerse the pretreated titanium sheet vertically into a 0.5 mol / L cerium-manganese precursor solution, treat it using the dip-pull method, and then air dry it. Step S12: Place the titanium sheet obtained in step S11 into a muffle furnace and bake it in air at a temperature of 450℃-550℃ for 2-3 hours, then let it cool naturally to room temperature. Step S13, repeat steps S11 and S12 until the thickness of the cerium-manganese coating reaches 15μm-20μm.

9. The water environment-geothermal energy synergistic treatment method according to claim 7, characterized in that, The adsorbent used in the modified adsorption unit is a zeolite adsorbent loaded with nano-iron oxides, and the preparation method of the zeolite adsorbent loaded with nano-iron oxides is as follows: Step S101: Prepare activated zeolite; Step S102: Immerse the activated zeolite in ferrous sulfate solution and stir for 2-4 hours under nitrogen protection; Step S103: The zeolite obtained in step S102 is heated to 600℃-700℃ at a rate of 10℃ / min under a nitrogen atmosphere and kept at that temperature for 1.5h-2h to prepare a zeolite adsorbent with a nano-iron oxide loading of 0.8mg / cm²-1.2mg / cm².

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