A treatment system and method for directly discharging initial rainwater of a Yangtze River basin thermal power plant up to standard

Abstract

The application provides a treatment system and method for initial rainwater of a power plant in the Yangtze River Basin. The treatment system comprises an initial rainwater pool for collecting and depositing the initial rainwater of the plant area, an initial rainwater lifting pump for pressurizing and lifting the deposited initial rainwater, a self-cleaning filter for rough filtering the initial rainwater, a quartz sand filter tank for intercepting small-particle suspended solids in the rainwater, an activated carbon filter tank for adsorbing organic matter and heavy metals in the rainwater, a security filter for precise filtering the rainwater, an ion exchange resin tank for deep treatment of ammonia nitrogen in the rainwater, and a tail water discharge pool for collecting and monitoring the treated tail water. The system adopts a combination of serial physical filtration and ion exchange process, and can achieve the comprehensive goals of compact and intensive system, simple operation and maintenance, and controllable overall investment and operation cost.

Description

Technical Field

[0001] This application relates to the field of rainwater treatment technology, and more specifically, to a system and method for treating initial rainwater discharge from thermal power plants in the Yangtze River Basin to meet standards. Background Technology

[0002] The ecological and environmental protection of the Yangtze River Basin has entered the most stringent period. The pollutant discharge indicators of the rainwater outlets of thermal power plants located in the basin, especially the initial rainwater, must be strictly approved and controlled in accordance with the Class III surface water quality standard.

[0003] The initial rainwater runoff from thermal power plants (usually 5-15 minutes before rainfall) carries large amounts of suspended solids, coal dust ash, and nitrogen compounds due to scouring coal yards, ash dumps, and transport roads. This results in significantly higher concentrations of pollutants such as chemical oxygen demand (COD), suspended solids (SS), ammonia nitrogen, and total nitrogen, often reaching or even exceeding Class V water quality standards, making treatment extremely difficult. Current mainstream treatment solutions have significant limitations in addressing this challenge, failing to simultaneously meet the stringent standards of new regulations and the economical and practical requirements of industrial application. Specifically: 1. Chemical precipitation method: Although it can effectively remove pollutants, it requires continuous addition of acid, alkali, flocculant and other agents, which not only introduces the safety risks of hazardous chemical storage and management, but also requires the construction of large pools to ensure sufficient reaction and precipitation time, resulting in a huge system footprint and complex operation and maintenance.

[0004] 2. Biological treatment method: This method is sensitive to operating conditions such as water quality and temperature, and has poor adaptability to intermittent, high-load shocks such as initial rainwater runoff, resulting in unstable treatment effects. More importantly, to ensure the activity of microorganisms, operation must continue even during non-rainfall periods (such as aeration and nutrient addition), leading to continuous energy and resource waste and poor operational economy.

[0005] 3. Membrane separation technology: Although it has excellent treatment effect and small footprint, its core membrane components are expensive, and it has high requirements for the quality of the influent water and requires frequent chemical cleaning, resulting in high overall investment and operation and maintenance costs, making it difficult to promote on a large scale in scenarios such as thermal power plants where cost control is strictly required.

[0006] In summary, existing technologies for treating initial rainwater runoff from thermal power plants in the Yangtze River basin generally face a dilemma in balancing effectiveness, land use, cost, and operation and maintenance. Therefore, there is an urgent need to develop a new treatment process that can reliably meet the stringent Class III water discharge standards while overcoming the shortcomings of existing technologies, achieving a comprehensive goal of a compact and efficient system, simple operation and maintenance, and controllable overall investment and operating costs. Summary of the Invention

[0007] This application provides at least one embodiment of a direct discharge treatment system and method for initial rainwater from thermal power plants in the Yangtze River Basin that meets standards. It adopts a series combination of pure physical filtration and ion exchange processes, which can achieve the comprehensive goals of a compact and efficient system, simple operation and maintenance, and controllable overall investment and operating costs.

[0008] In a first aspect, embodiments of this application provide a direct discharge treatment system for initial rainwater from thermal power plants in the Yangtze River Basin, comprising: Initial rainwater collection pond, used to collect and settle initial rainwater in the factory area; The initial rainwater lifting pump has its inlet connected to the initial rainwater tank and is used to pressurize and lift the settled initial rainwater. The self-cleaning filter has its inlet connected to the outlet of the initial rainwater lift pump and is used to coarsely filter the initial rainwater. A quartz sand filter tank, the inlet of which is connected to the outlet of the self-cleaning filter, is used to intercept small-diameter suspended solids in rainwater; An activated carbon filter canister, the inlet of which is connected to the outlet of the quartz sand filter canister, is used to adsorb organic matter and heavy metals in rainwater. A security filter, whose inlet is connected to the outlet of the activated carbon filter tank, is used for precision filtration of rainwater. An ion exchange resin tank, the inlet of which is connected to the outlet of the security filter, is used for deep treatment of ammonia nitrogen in rainwater. The effluent discharge tank is connected to the outlet of the ion exchange resin tank and is used to collect and monitor the treated effluent that meets the standards.

[0009] In one optional embodiment, the self-cleaning filter has a filtration accuracy of 200 micrometers; the security filter has a filtration accuracy of 5 micrometers.

[0010] In one optional embodiment, the activated carbon filled in the activated carbon filter tank is coconut shell activated carbon with an iodine value of not less than 1000 mg / g; the resin filled in the ion exchange resin tank is a strong acid cation exchange resin.

[0011] In one optional embodiment, the quartz sand filter tank, the activated carbon filter tank, and the ion exchange resin tank are all provided with backwashing ports; The system also includes a backwash pump, the inlet of which is connected to the tailwater discharge tank, and the outlet of which is connected to the backwash interface of the quartz sand filter tank, the activated carbon filter tank, and the ion exchange resin tank to provide backwash water.

[0012] In one optional embodiment, both the quartz sand filter tank and the activated carbon filter tank are provided with an air washing interface; The system also includes an air supply device, the air outlet of which is connected to the air washing interface of the quartz sand filter tank and the activated carbon filter tank, for supplying cleaning gas to the quartz sand filter tank and the activated carbon filter tank.

[0013] In one optional embodiment, the ion exchange resin tank is provided with a regeneration solution interface; The system also includes a regeneration tank and a regeneration pump. The regeneration tank is used to prepare the regeneration solution, and the regeneration pump is connected to the regeneration interface of the regeneration tank and the ion exchange resin tank to transport the regeneration solution in the regeneration tank to the ion exchange resin tank.

[0014] Secondly, this application also provides a method for treating the direct discharge of initial rainwater from thermal power plants in the Yangtze River Basin to meet standards, applicable to the direct discharge system for initial rainwater from thermal power plants in the Yangtze River Basin described in any of the foregoing embodiments. The method includes the following steps: S1: Collect the initial rainwater in the factory area into the initial rainwater pond for preliminary sedimentation; S2: The settled rainwater is pumped to a self-cleaning filter for coarse filtration via a lift pump; S3: Pass the water from the self-cleaning filter into the quartz sand filter tank to trap small-diameter suspended solids in the rainwater; S4: Pass the effluent from the quartz sand filter tank into the activated carbon filter tank to adsorb organic matter and heavy metals in the rainwater. S5: Pass the water effluent from the activated carbon filter tank into the security filter for precision filtration; S6: The effluent from the security filter is passed into the ion exchange resin tank to perform deep treatment of ammonia nitrogen in the rainwater. The treated effluent is then discharged into the tailwater discharge pool.

[0015] In one optional implementation, in step S1, the initial rainwater settles in the initial rainwater pool for no less than 2 hours.

[0016] In an optional embodiment, the method further includes a backwashing step: when the inlet and outlet pressure difference of the quartz sand filter tank, activated carbon filter tank and ion exchange resin tank reaches 0.01 MPa or the operation reaches a preset time period, backwashing is performed using a backwashing pump or gas washing is performed using an air supply device.

[0017] In one optional embodiment, the method further includes a regeneration step: when the effluent quality of the ion exchange resin tank is substandard or reaches a preset operating cycle, a regeneration pump is used to transport the regenerated liquid in the regeneration tank to the ion exchange resin tank for regeneration.

[0018] The above-mentioned technical solution of this application has the following beneficial technical effects: The Yangtze River Basin thermal power plant initial rainwater discharge treatment system of this application embodiment adopts a series combination of pure physical filtration and ion exchange processes. This avoids complex chemical dosing and biochemical reaction processes, simplifying operation and maintenance. The series equipment chain facilitates highly compact layout, significantly reducing land area. Mature and standardized unit equipment greatly reduces investment costs, and the fact that the main process requires no chemical dosing effectively controls operating expenses. In summary, this system, employing a series combination of pure physical filtration and ion exchange processes, achieves the comprehensive goals of a compact system, simplified operation and maintenance, and controllable overall investment and operating costs.

[0019] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. These drawings are incorporated in and constitute a part of this specification. They illustrate embodiments conforming to this application and, together with the specification, serve to explain the technical solutions of this application. It should be understood that the following drawings only show some embodiments of this application and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This invention provides a schematic diagram of the layout of a direct discharge treatment system for initial rainwater from thermal power plants in the Yangtze River Basin, as provided in an embodiment of this application. Figure 2 This application provides a process flow diagram of a direct discharge treatment system for initial rainwater from thermal power plants in the Yangtze River Basin, according to an embodiment of the present application. In the diagram: 1. Sedimentation zone; 2. Clarified liquid zone; 3. Initial rainwater lift pump; 4. Self-cleaning filter; 5. Quartz sand filter tank; 6. Activated carbon filter tank; 7. Security filter; 8. Ion exchange resin tank; 9. Tailwater discharge tank; 10. Backwash pump; 11. Regeneration tank; 12. Regeneration pump; 13. Regeneration waste liquid tank; 14. Regeneration waste liquid transfer pump. Detailed Implementation

[0022] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0023] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0024] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0025] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] refer to Figures 1 to 2This application provides a direct discharge treatment system for initial rainwater from thermal power plants in the Yangtze River Basin. The system includes an initial rainwater tank, an initial rainwater lift pump 3, a self-cleaning filter 4, a quartz sand filter tank 5, an activated carbon filter tank 6, a security filter 7, an ion exchange resin tank 8, and a tailwater discharge tank 9. The initial rainwater tank collects and settles the initial rainwater from the plant area. The inlet of the initial rainwater lift pump 3 is connected to the initial rainwater tank to pressurize and lift the settled initial rainwater. The inlet of the self-cleaning filter 4 is connected to the outlet of the initial rainwater lift pump 3. The self-cleaning filter 4 has a filtration accuracy of 200 microns and is used for coarse filtration of the initial rainwater. The inlet of the quartz sand filter tank 5 is connected to the outlet of the self-cleaning filter 4 to intercept rainwater. Small-diameter suspended solids in the rainwater; the inlet of activated carbon filter tank 6 is connected to the outlet of quartz sand filter tank 5. The activated carbon in activated carbon filter tank 6 is coconut shell activated carbon with an iodine value of not less than 1000 mg / g, used to adsorb organic matter and heavy metals in rainwater; the inlet of security filter 7 is connected to the outlet of activated carbon filter tank 6. The security filter 7 has a filtration accuracy of 5 microns and is used for precision filtration of rainwater; the inlet of ion exchange resin tank 8 is connected to the outlet of security filter 7. The resin in ion exchange resin tank 8 is strong acid cation exchange resin, used for deep treatment of ammonia nitrogen in rainwater; the tailwater discharge tank 9 is connected to the outlet of ion exchange resin tank 8 and is used to collect and monitor the treated tailwater that meets the standards.

[0028] Optionally, the initial rainwater tank includes a sedimentation zone 1 and a clear liquid zone 2. Sedimentation zone 1 includes an inlet and an outlet; the inlet is connected to the plant's rainwater pipe network, and the outlet is connected to the clear liquid zone 2. In operation, initial rainwater flows into sedimentation zone 1 through the plant's rainwater pipe network. The settled clear liquid flows into clear liquid zone 2 through the outlet, and then the initial rainwater booster pump 3 pumps the clear liquid from clear liquid zone 2 to the self-cleaning filter 4. In practical applications, it is necessary to periodically remove the sediment from sedimentation zone 1.

[0029] Optionally, an electric valve can be installed at the inlet of sedimentation zone 1. In practice, the electric valve can be interlocked with the plant's rain gauge to ensure the collection of initial rainwater. Similarly, an electric valve can be installed at the outlet of sedimentation zone 1 to control the flow of clarified liquid into clarified liquid zone 2.

[0030] Optionally, a level gauge is installed in the clear liquid zone 2. In specific implementation, the level gauge can be interlocked with the initial rainwater lift pump 3. When the clear liquid level in the clear liquid zone 2 reaches the set value, the initial rainwater lift pump 3 will pressurize and lift the clear liquid out.

[0031] Optionally, the self-cleaning filter 4 includes an inlet, an outlet, a drain outlet, and a pressure sensor. The inlet of the self-cleaning filter 4 is connected to the outlet pipe of the initial rainwater booster pump 3, the outlet of the self-cleaning filter 4 is connected to the quartz sand filter tank 5, and the drain outlet of the self-cleaning filter 4 is connected to the sedimentation zone 1. In use, the self-cleaning filter 4 controls its self-cleaning operation by setting the pressure difference between its inlet and outlet and the cleaning time cycle, enabling continuous water supply while completing the self-cleaning operation.

[0032] Optionally, the security filter 7 includes an inlet, an outlet, a drain port, and a pressure gauge. The inlet of the security filter 7 is connected to the outlet pipe of the activated carbon filter tank 6, the outlet of the security filter 7 is connected to the ion exchange resin tank 8, and the drain port of the security filter 7 is connected to the inlet of the sedimentation zone 1. In use, the security filter 7 controls the filter element replacement cycle by setting the pressure difference between the inlet and outlet.

[0033] Optionally, the quartz sand filter tank 5 is equipped with a backwash port and an air wash port. The system also includes a backwash pump 10 and an air supply device. The inlet of the backwash pump 10 is connected to the tailwater discharge tank 9, and the outlet of the backwash pump 10 is connected to the backwash port of the quartz sand filter tank 5 to provide backwash water. The outlet of the air supply device is connected to the air wash port of the quartz sand filter tank 5 to provide cleaning gas to the quartz sand filter tank 5.

[0034] For example, the quartz sand filter tank 5 includes an inlet, an outlet, a backwash inlet, a backwash outlet, a forward wash outlet, an air wash inlet, an exhaust port, and a pressure sensor. The inlet of the quartz sand filter tank 5 is connected to the outlet pipe of the self-cleaning filter 4; the outlet of the quartz sand filter tank 5 is connected to the activated carbon filter tank 6; the backwash inlet of the quartz sand filter tank 5 is connected to the outlet pipe of the backwash pump 10; the backwash outlet and forward wash outlet pipes of the quartz sand filter tank 5 are combined and connected to the inlet of the sedimentation zone 1; the air wash inlet of the quartz sand filter tank 5 is connected to the compressed air supply pipe of the plant area; and the exhaust port of the quartz sand filter tank 5 extends from the top of the tank to the ground and then connects to the inlet of the sedimentation zone 1. During use, the cleaning operation of the quartz sand filter tank 5 is controlled by the pressure difference setting value between the inlet and outlet and the cleaning time cycle setting. In this embodiment, the above-mentioned inlet, outlet, backwash inlet, backwash outlet, forward wash outlet, air wash inlet and exhaust outlet are all equipped with automatic valves, which can be automatically controlled by the automatic control program, while retaining the manual control function of the manual valve.

[0035] Optionally, the activated carbon filter tank 6 is equipped with a backwash port and an air wash port. The system also includes a backwash pump 10 and an air supply device. The inlet of the backwash pump 10 is connected to the tailwater discharge tank 9, and the outlet of the backwash pump 10 is connected to the backwash port of the activated carbon filter tank 6 to provide backwash water. The outlet of the air supply device is connected to the air wash port of the activated carbon filter tank 6 to provide cleaning gas to the activated carbon filter tank 6.

[0036] For example, the activated carbon filter tank 6 includes an inlet, an outlet, a backwash inlet, a backwash outlet, a forward wash outlet, an air wash inlet, an exhaust port, and a pressure sensor. The inlet of the activated carbon filter tank 6 is connected to the outlet pipeline of the quartz sand filter tank 5, the outlet of the activated carbon filter tank 6 is connected to the security filter 7, the backwash inlet of the activated carbon filter tank 6 is connected to the outlet pipeline of the backwash pump 10, the backwash outlet and forward wash outlet pipelines of the activated carbon filter tank 6 are combined and connected to the inlet of the sedimentation zone 1, the air wash inlet of the activated carbon filter tank 6 is connected to the compressed air supply pipeline of the plant area, and the exhaust port of the activated carbon filter tank 6 extends from the top of the tank to the ground and then connects to the inlet of the sedimentation zone 1. In use, the cleaning operation of the activated carbon filter tank 6 is controlled by the pressure difference setting value between the inlet and outlet and the cleaning time cycle setting. In this embodiment, the above-mentioned inlet, outlet, backwash inlet, backwash outlet, forward wash outlet, air wash inlet and exhaust outlet are all equipped with automatic valves, which can be automatically controlled by the automatic control program, while retaining the manual control function of the manual valve.

[0037] Optionally, the ion exchange resin tank 8 is equipped with a backwash port and a regenerated solution port. The system also includes a backwash pump 10, a regeneration tank 11, and a regeneration pump 12. The inlet of the backwash pump 10 is connected to the tailwater discharge tank 9, and the outlet of the backwash pump 10 is connected to the backwash port of the ion exchange resin tank 8 to provide backwash water. The regeneration tank 11 is used to prepare the regenerated solution (8% sulfuric acid / hydrochloric acid). The regeneration pump 12 is connected to the regeneration tank 11 and the regenerated solution port of the ion exchange resin tank 8 to transport the regenerated solution in the regeneration tank 11 to the ion exchange resin tank 8.

[0038] For example, the ion exchange resin tank 8 includes an inlet, an outlet, a backwash inlet, a backwash outlet, a regenerated liquid inlet, a forward wash / regenerated liquid outlet, and a pressure gauge. The inlet of the ion exchange resin tank 8 is connected to the outlet pipeline of the security filter 7, the outlet of the ion exchange resin tank 8 is connected to the tailwater discharge tank 9, the backwash inlet of the ion exchange resin tank 8 is connected to the outlet pipeline of the backwash pump 10, the backwash outlet pipeline of the ion exchange resin tank 8 is connected to the inlet of the sedimentation zone 1, the regenerated liquid inlet of the ion exchange resin tank 8 is connected to the outlet of the regeneration pump 12, and the forward wash / regenerated liquid outlet of the ion exchange resin tank 8 is connected to the inlet of the regeneration waste liquid tank 13. During use, the regeneration operation of the ion exchange resin tank 8 is controlled by the pressure difference setpoint between the inlet and outlet and the system effluent water quality monitoring value. In this embodiment, automatic valves are installed at the inlet, outlet, backwash inlet, backwash outlet, regenerated liquid inlet, and forward wash / regenerated liquid outlet, which can be automatically controlled by an automatic control program while retaining the manual control function of the manual valves.

[0039] Optionally, the system also includes a regenerated waste liquid tank 13 and a regenerated waste liquid transfer pump 14. The inlet of the regenerated waste liquid tank 13 is connected to the positive wash / regenerated liquid outlet of the ion exchange resin tank 8 for collecting regenerated waste liquid. The inlet of the regenerated waste liquid transfer pump 14 is connected to the outlet of the regenerated waste liquid tank 13, and the outlet of the regenerated waste liquid transfer pump 14 is connected to the wastewater treatment plant in the plant area for transporting the collected regenerated waste liquid to the wastewater treatment plant in the plant area.

[0040] The Yangtze River Basin thermal power plant initial rainwater discharge treatment system according to this application embodiment includes the following steps for treating initial rainwater: S1: Collect the initial rainwater in the factory area into the initial rainwater pond for preliminary sedimentation; S2: The settled rainwater is pumped to the self-cleaning filter 4 for coarse filtration via a lift pump; S3: Pass the water from the self-cleaning filter 4 into the quartz sand filter tank 5 to trap small-diameter suspended solids in the rainwater; S4: Pass the effluent from the quartz sand filter tank 5 into the activated carbon filter tank 6 to adsorb organic matter and heavy metals in the rainwater. S5: Pass the water effluent from the activated carbon filter tank 6 into the security filter 7 for precision filtration; S6: The effluent from the security filter 7 is passed into the ion exchange resin tank 8 to perform deep treatment of ammonia nitrogen in the rainwater. The treated effluent is then discharged into the tailwater discharge pool 9.

[0041] Optionally, in S1, the initial rainwater sedimentation time in the initial rainwater pool is not less than 2 hours.

[0042] Optionally, the method further includes a backwashing step: when the inlet and outlet pressure difference of the quartz sand filter tank 5, the activated carbon filter tank 6, or the ion exchange resin tank 8 reaches 0.01 MPa or the operation reaches a preset time period, backwashing is performed using the backwashing pump 10 or air washing is performed using the air supply equipment.

[0043] Optionally, the method further includes a regeneration step: when the effluent quality of the ion exchange resin tank 8 does not meet the standards or reaches the preset operating cycle, the regeneration pump 12 is used to transport the regeneration liquid in the regeneration tank 11 to the ion exchange resin tank 8 for regeneration.

[0044] The Yangtze River Basin thermal power plant initial rainwater discharge treatment system of this application embodiment adopts a series combination of pure physical filtration and ion exchange processes. This avoids complex chemical dosing and biochemical reaction processes, simplifying operation and maintenance. The series equipment chain facilitates highly compact layout, significantly reducing land area. Mature and standardized unit equipment greatly reduces investment costs, and the fact that the main process requires no chemical dosing effectively controls operating expenses. In summary, this system, employing a series combination of pure physical filtration and ion exchange processes, achieves the comprehensive goals of a compact system, simplified operation and maintenance, and controllable overall investment and operating costs.

[0045] One or more embodiments in this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this specification should be included within the protection scope of this application.

[0046] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A direct discharge treatment system for initial rainwater from thermal power plants in the Yangtze River Basin, characterized in that, include: Initial rainwater collection pond, used to collect and settle initial rainwater in the factory area; The initial rainwater lifting pump has its inlet connected to the initial rainwater tank and is used to pressurize and lift the settled initial rainwater. The self-cleaning filter has its inlet connected to the outlet of the initial rainwater lift pump and is used to coarsely filter the initial rainwater. A quartz sand filter tank, the inlet of which is connected to the outlet of the self-cleaning filter, is used to intercept small-diameter suspended solids in rainwater; An activated carbon filter canister, the inlet of which is connected to the outlet of the quartz sand filter canister, is used to adsorb organic matter and heavy metals in rainwater. A security filter, whose inlet is connected to the outlet of the activated carbon filter tank, is used for precision filtration of rainwater. An ion exchange resin tank, the inlet of which is connected to the outlet of the security filter, is used for deep treatment of ammonia nitrogen in rainwater. The effluent discharge tank is connected to the outlet of the ion exchange resin tank and is used to collect and monitor the treated effluent that meets the standards.

2. The Yangtze River Basin thermal power plant initial rainwater discharge treatment system according to claim 1, characterized in that, The self-cleaning filter has a filtration accuracy of 200 micrometers; the security filter has a filtration accuracy of 5 micrometers.

3. The Yangtze River Basin thermal power plant initial rainwater discharge treatment system according to claim 1, characterized in that, The activated carbon in the activated carbon filter tank is coconut shell activated carbon with an iodine value of not less than 1000 mg / g; the resin in the ion exchange resin tank is a strong acid cation exchange resin.

4. The Yangtze River Basin Thermal Power Plant Initial Rainwater Discharge Treatment System according to claim 1, characterized in that, The quartz sand filter tank, the activated carbon filter tank, and the ion exchange resin tank are all equipped with backwashing ports; The system also includes a backwash pump, the inlet of which is connected to the tailwater discharge tank, and the outlet of which is connected to the backwash interface of the quartz sand filter tank, the activated carbon filter tank, and the ion exchange resin tank to provide backwash water.

5. The Yangtze River Basin thermal power plant initial rainwater discharge treatment system according to claim 1, characterized in that, Both the quartz sand filter tank and the activated carbon filter tank are equipped with an air washing interface; The system also includes an air supply device, the air outlet of which is connected to the air washing interface of the quartz sand filter tank and the activated carbon filter tank, for supplying cleaning gas to the quartz sand filter tank and the activated carbon filter tank.

6. The Yangtze River Basin Thermal Power Plant Initial Rainwater Discharge Treatment System according to claim 1, characterized in that, The ion exchange resin tank is equipped with a regeneration solution interface; The system also includes a regeneration tank and a regeneration pump. The regeneration tank is used to prepare the regeneration solution, and the regeneration pump is connected to the regeneration interface of the regeneration tank and the ion exchange resin tank to transport the regeneration solution in the regeneration tank to the ion exchange resin tank.

7. A method for treating compliant direct discharge of initial rainwater from thermal power plants in the Yangtze River Basin, applicable to the compliant direct discharge treatment system for initial rainwater from thermal power plants in the Yangtze River Basin as described in any one of claims 1-6, characterized in that, The method includes the following steps: S1: Collect the initial rainwater in the factory area into the initial rainwater pond for preliminary sedimentation; S2: The settled rainwater is pumped to a self-cleaning filter for coarse filtration via a lift pump; S3: Pass the water from the self-cleaning filter into the quartz sand filter tank to trap small-diameter suspended solids in the rainwater; S4: Pass the effluent from the quartz sand filter tank into the activated carbon filter tank to adsorb organic matter and heavy metals in the rainwater. S5: Pass the water effluent from the activated carbon filter tank into the security filter for precision filtration; S6: The effluent from the security filter is passed into the ion exchange resin tank to perform deep treatment of ammonia nitrogen in the rainwater. The treated effluent is then discharged into the tailwater discharge pool.

8. The method according to claim 7, characterized in that, In S1, the initial rainwater sedimentation time in the initial rainwater pool is not less than 2 hours.

9. The method according to claim 7, characterized in that, The method also includes a backwashing step: when the inlet and outlet pressure difference of the quartz sand filter tank, activated carbon filter tank and ion exchange resin tank reaches 0.01 MPa or the operation reaches a preset time period, backwashing is performed using a backwashing pump or air washing is performed using an air supply device.

10. The method according to claim 7, characterized in that, The method also includes a regeneration step: when the water quality of the effluent from the ion exchange resin tank does not meet the standards or reaches the preset operating cycle, the regeneration pump is used to transport the regenerated liquid in the regeneration tank to the ion exchange resin tank for regeneration.

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