Underground water remediation system based on oxidation reaction zone

Abstract

The invention discloses a groundwater remediation system based on an oxidation reaction zone. The groundwater remediation system comprises a general control integration subsystem, a groundwater circulation well subsystem, a chemical injection subsystem and a monitoring subsystem. The groundwater circulating well subsystem comprises a plurality of groundwater circulating wells distributed at the downstream of the polluted area, each groundwater circulating well forms a vertically flowing hydraulic influence area in a respective vertical area, and the hydraulic influence areas corresponding to the plurality of groundwater circulating wells are connected in series to form a hydraulic oxidation reaction zone; the monitoring subsystem monitors underground water quality condition data of the upstream and the downstream of the underground water circulation wells and transmits the monitoring data to the general control integration subsystem, and the general control integration subsystem controls the chemical injection subsystem according to the monitoring data and adjusts chemical injection parameters of each underground water circulation well. The type and concentration of underground water pollutants are monitored in real time, the injection amount and the medicament type are precisely adjusted in a targeted mode, further outward diffusion of the pollutants is greatly prevented, and effective control over the pollution plume is achieved.

Description

Technical Field

[0001] This invention relates to the field of soil and groundwater pollution control and remediation technology, specifically to a groundwater remediation system based on the oxidation reaction zone. Background Technology

[0002] Landfills have long been a critical bottleneck in urban environmental governance. While disposing of municipal solid waste, they also continuously release potential pollution hazards, with leachate posing a particularly prominent threat to groundwater, considered a highly insidious and devastating "ecological killer." Leachate has a complex composition, containing high concentrations of organic matter, heavy metals, and ammonia nitrogen, among other pollutants. If the landfill's anti-seepage system is flawed, these pollutants will migrate to underground aquifers, significantly altering the physicochemical properties of groundwater and severely deteriorating its quality. These pollutants, especially heavy metals and persistent organic pollutants, are difficult to decay naturally in the underground environment, resulting in long-term persistence and cumulative effects. Some organic compounds also pose risks of carcinogenesis, teratogenesis, and malignancy. When groundwater is extracted and used as a drinking water source, it directly endangers public health and damages the groundwater ecosystem. Furthermore, groundwater pollution is characterized by its insidious nature, difficulty in remediation, long treatment cycles, and high costs, making its remediation an extremely challenging task.

[0003] Against this backdrop, in-situ groundwater remediation technology demonstrates significant advantages. This technology eliminates the need for large-scale extraction of contaminated groundwater to the surface. Instead, it directly adds chemical oxidants or introduces specific degrading microorganisms into the contamination plume to achieve in-situ decomposition of pollutants, avoiding the energy consumption and secondary pollution risks associated with extraction, transportation, and subsequent treatment. In-situ treatment also minimizes disturbance to the surrounding environment, offering advantages such as high remediation efficiency and relatively low operating costs. Furthermore, it can curb pollution spread at its source, achieving highly efficient treatment of groundwater contaminated by landfill leachate. This technology is particularly suitable for areas with wide-ranging contamination and complex aquifers, and can flexibly adjust treatment plans according to different geological conditions and contamination levels, ensuring effective groundwater remediation while maintaining the integrity and sustainability of the ecosystem.

[0004] In groundwater remediation, traditional manual sampling and testing methods are not only inefficient, but also struggle to obtain real-time and comprehensive information on groundwater pollution levels, resulting in a lack of accurate data to support remediation plans. Furthermore, manual operations are prone to errors, such as those occurring during the addition of chemical agents, which can negatively impact remediation outcomes. Summary of the Invention

[0005] The system monitors the type and concentration of pollutants in groundwater in real time, and precisely adjusts the injection volume and type of reagents to form a pollutant "barrier" with oxidizing agents at its core. This greatly prevents pollutants from spreading further outward and achieves effective control of pollution plumes.

[0006] The present invention adopts the following technical solution: A groundwater remediation system based on an oxidation reaction zone is disclosed. The system includes a central control and integration subsystem, and electrically connected to the subsystem are a groundwater circulation well subsystem, a chemical injection subsystem, and a monitoring subsystem. The groundwater circulation well subsystem comprises several groundwater circulation wells distributed downstream of the contaminated area. Each groundwater circulation well forms a vertically flowing hydraulic influence zone in its respective vertical region. The hydraulic influence zones corresponding to multiple groundwater circulation wells are connected in series to form a hydraulic oxidation reaction zone. The monitoring subsystem monitors the groundwater quality data upstream and downstream of the groundwater circulation wells and transmits the monitoring data to the central control and integration subsystem. The central control and integration subsystem controls the chemical injection subsystem based on the monitoring data, adjusting the chemical injection parameters of each groundwater circulation well.

[0007] Preferably, the hydraulic influence areas formed by adjacent groundwater circulation wells partially overlap.

[0008] The monitoring subsystem includes an early warning monitoring well, a warning monitoring well, and a detector. The early warning monitoring well is located upstream of the groundwater circulation well, and the warning monitoring well is located downstream of the groundwater circulation well. The early warning monitoring well and the warning monitoring well are equipped with detectors to monitor the groundwater quality data upstream and downstream of the groundwater circulation well, respectively.

[0009] More preferably, multiple early warning monitoring wells and multiple warning monitoring wells are provided. Groundwater within the monitoring range of the early warning monitoring wells first flows through the hydraulic oxidation reaction zone and then flows through the distribution area of ​​the warning monitoring wells.

[0010] The chemical injection subsystem includes a chemical storage device, a chemical injection pump, and an intelligent control device. The chemical storage device stores oxidizing agents corresponding to groundwater pollutants. The inlet of the chemical injection pump is connected to the chemical storage device, and its outlet is connected to each of the groundwater circulation wells. The intelligent control device is connected to the overall control integration subsystem, receives control commands from the overall control integration subsystem, and controls the amount and speed of chemical injection by the chemical injection pump into each of the groundwater circulation wells.

[0011] Preferably, the overall control integrated subsystem calculates the reagent injection data based on the collected groundwater pollution type and concentration, and instructs the intelligent control device to regulate the type and amount of reagent injected.

[0012] More preferably, each of the groundwater circulation wells is provided with a separator that divides the interior of the groundwater circulation well into an extraction area and an injection area, and adopts an upward extraction and downward injection or upward injection and downward extraction method according to the contaminated site conditions and the form of the agent.

[0013] Compared with traditional technologies, this invention has the following technical advantages: A. The system of this invention monitors groundwater pollution data in real time through a monitoring subsystem and adjusts the agent type of the injection subsystem in a targeted manner, enabling rapid and effective treatment of polluted areas. Combined with the coordinated operation of various subsystems, the groundwater circulation well subsystem realizes the vertical circulation of groundwater, effectively improving the formation efficiency and stability of the hydraulic oxidation reaction zone and accelerating the oxidation reaction process of groundwater pollutants flowing through the hydraulic oxidation reaction zone. Compared with traditional manual sampling, detection and operation methods, it greatly shortens the remediation cycle and reduces time costs.

[0014] B. The chemical injection subsystem in this invention adopts independent control for each well, which can accurately control the injection volume and injection rate of the chemical based on monitoring data; the monitoring subsystem monitors the type and concentration of various pollutants in the groundwater in real time and accurately, ensuring that the chemical injection subsystem can accurately repair different pollution conditions, avoiding the problems of over-repair or under-repair that may occur in traditional remediation methods.

[0015] C. The system of this invention reduces manual operation, lowers human error and labor costs. At the same time, the overall control subsystem can automatically adjust the injection subsystem program according to the calculation results, avoiding waste of chemicals and reducing chemical costs. Moreover, the in-situ treatment method does not require the extraction of large amounts of contaminated groundwater, reducing energy consumption and the risk of secondary pollution during extraction and transportation, further reducing the overall remediation cost. In addition, depending on the site conditions, the entire remediation system can use green chemicals and green electricity, further reducing operating costs.

[0016] D. In terms of sustainability, the present invention minimizes disturbance to the surrounding environment, which is conducive to protecting the integrity of the ecosystem. It can also flexibly adjust the treatment plan according to different geological conditions and pollution levels, and has strong adaptability and scalability. It provides a reference for the design of similar contaminated site remediation projects, helps to promote the sustainable development of the entire groundwater remediation field, and makes an important contribution to the protection of groundwater resources and the ecological environment. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the intelligent groundwater remediation system provided by the present invention; Figure 2A schematic diagram of the plan layout of the intelligent groundwater remediation system provided by the present invention; Figure 3 A schematic diagram of the water cycle in the intelligent groundwater remediation system provided by this invention; Figure 4 This is a structural diagram of the drug delivery subsystem provided by the present invention.

[0019] The meanings of the symbols shown in the image are as follows: 1-Groundwater circulation well subsystem, 11-Groundwater circulation well, 12-Separator 2-Monitoring Subsystem 21-Early warning monitoring well, 22-Warning monitoring well, 23-Detector 3-Injection Subsystem 31-Drug storage device, 32-Drug injection device, 33-Intelligent control device 4-Overall control integrated subsystem; 5-Hydraulic influence zone; 6-Hydraulic oxidation reaction zone 7-Transportation pipeline; 8-Valve. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly 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 communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] like Figure 1As shown, this invention provides a groundwater remediation system based on an oxidation reaction zone, including a central control integration subsystem 4, a groundwater circulation well subsystem 1, a chemical injection subsystem 3, and a monitoring subsystem 2; the groundwater circulation well subsystem 1 includes several groundwater circulation wells 11 distributed downstream of the contaminated area. Figure 1 The groundwater circulation wells 11 are arranged in a straight line, but their distribution can be adjusted according to the topography of the polluted area. Each groundwater circulation well 11 forms a vertically flowing hydraulic influence zone 5 within its respective vertical region. Each groundwater circulation well 11 is independently controlled. The hydraulic influence zones 5 corresponding to multiple groundwater circulation wells 11 are connected in series to form a hydraulic oxidation reaction zone 6. All water in the polluted area flows downstream. Since the hydraulic oxidation reaction zone 6 is located downstream of the polluted area, all polluted groundwater from upstream undergoes purification treatment at the hydraulic oxidation reaction zone 6 as it flows through it. The monitoring subsystem 2 monitors the groundwater quality data upstream and downstream of the groundwater circulation wells 11 and transmits the monitoring data to the central control integration subsystem 4. The central control integration subsystem 4 controls the chemical injection subsystem 3 to adjust the chemical injection parameters of each groundwater circulation well 11 based on the monitoring data.

[0024] This invention monitors the type and concentration of groundwater pollutants in real time and precisely adjusts the injection volume and type of reagent in the injection subsystem 3 to form a pollutant "barrier wall" with oxidizing agents at its core, which greatly blocks the further outward diffusion of pollutants and achieves effective control of pollution plumes.

[0025] During pollution plume control, the remediation system integrates highly efficient in-situ chemical oxidation remediation technology. Through real-time monitoring of the types and concentrations of groundwater pollutants, it dynamically adjusts the injection volume and reagent type of each groundwater circulation well 11 to achieve precise targeted removal of pollutants. Furthermore, this system uses groundwater circulation wells 11 instead of traditional injection wells, promoting vertical groundwater circulation and creating a larger impact area, thus fully agitating the groundwater carrying the reagents. This system's efficient, rapid, intelligent, and non-manual operation mode demonstrates excellent results in both soil and groundwater pollution treatment and control.

[0026] The groundwater circulation well subsystem 1 in this invention is one of the key components of the entire groundwater remediation system, including a separator 12 and a group of groundwater circulation wells 11; wherein the separator 12 is the core component of the groundwater circulation wells 11, which can divide the interior of the groundwater circulation wells 11 into two different areas for extraction and injection, thereby realizing the vertical flow of groundwater. Figure 2As shown, each groundwater circulation well 11 constitutes a vertically flowing hydraulic influence zone 5, and multiple groundwater circulation wells 11 constitute a hydraulic oxidation reaction zone 6. The hydraulic influence zones 5 formed by adjacent groundwater circulation wells 11 partially overlap, thereby preventing the spread of some polluted groundwater. The groundwater circulation well subsystem 1 provided by this invention is the key to the formation of the hydraulic oxidation reaction zone 6 and the core to ensuring the stability and operational effectiveness of the entire system. Figure 3 As shown, the remediation system can be configured to use either top-injection or top-injection-bottom-outjection methods depending on the site contamination and the form of the reagent, in order to achieve the best oxidation reaction effect.

[0027] like Figure 4 As shown, the chemical injection subsystem includes a chemical storage device 31, a chemical injection pump 32, and an intelligent control device 33. The chemical storage device 31 stores oxidizing agents corresponding to groundwater pollutants. The inlet of the chemical injection pump 32 is connected to the chemical storage device 31, and its outlet is connected to each groundwater circulation well 11 via a delivery pipe 7. Each delivery pipe 7 connected to each groundwater circulation well 11 is equipped with a valve 8. By controlling the opening and closing of the valve 8, each groundwater circulation well 11 can be independently controlled without affecting each other. The injection speed can also be controlled by controlling the rotation speed of the chemical injection pump 32, thereby controlling the injection amount. The intelligent control device 33 is connected to the central control integration subsystem 4. It receives control commands sent by the central control integration subsystem 4 and controls the amount and speed of chemical injected by the chemical injection pump 32 into each groundwater circulation well 11, ensuring that the injected chemical can fully react with the pollutants to achieve the best remediation effect. Of course, the central control integrated subsystem 4 can also generate reagent configuration data based on the collected groundwater pollution type, and instruct the intelligent control device 33 to control the injected reagent type and dosage, so as to automatically select the reagent type and configure the reagent concentration.

[0028] The reagent storage device 31 can store corresponding oxidizing agents according to different pollution conditions to meet the needs of targeted reactions. The delivery pipeline 7 is made of corrosion-resistant and high-strength materials to ensure that the reagent can be safely and stably delivered to the designated location. The injection pump 32 is the power equipment for injecting the reagent and is the "heart" of the injection subsystem.

[0029] The monitoring subsystem 2 includes an early warning monitoring well 21, an alert monitoring well 22, and a detector 23. The early warning monitoring well 21 is located upstream of the groundwater circulation well 11 and can detect the diffusion trend and concentration changes of pollutants in advance, providing early warning information for the system. In the early warning, the pollutant concentration is generally indicated by indicators such as ammonia nitrogen and COD. The alert monitoring well 22 is located downstream of the groundwater circulation well 11. Both the early warning monitoring well 21 and the alert monitoring well 22 are equipped with detectors 23, which monitor the groundwater quality data upstream and downstream of the groundwater circulation well 11, respectively.

[0030] like Figure 1 As shown, multiple early warning monitoring wells 21 and warning monitoring wells 22 are installed. Groundwater within the monitoring range of early warning monitoring well 21 flows through the distribution area of ​​the hydraulic oxidation reaction zone 6, and groundwater treated by the hydraulic oxidation reaction zone 6 flows through the distribution area of ​​warning monitoring well 22. Warning monitoring well 22 is located downstream of groundwater circulation well 11. When warning monitoring well 22 detects abnormal pollutant concentration or low oxidation-reduction potential, it indicates that there may be a problem with the hydraulic oxidation reaction zone 6 or that the diffusion of pollutants has exceeded the expected range. At this time, monitoring subsystem 2 will promptly issue a warning signal, and the injection subsystem 3 will take corresponding actions, such as increasing the injection rate and volume of oxidizing agent. Detector 23 features high precision, high sensitivity, and rapid detection. Employing advanced sampling, acquisition, and analysis technologies, it can monitor the types and concentrations of various pollutants in groundwater in real time and accurately, transmitting the monitoring data to the central control integration subsystem 4 to provide a reliable basis for subsequent decision-making.

[0031] The central control and integration subsystem 4 is the "brain" of the entire intelligent groundwater remediation system. It receives data from the monitoring subsystem 2 and uses advanced algorithms and models to accurately calculate the amount of groundwater contaminants and the dosage of reagents injected. For contaminant calculation, the central control and integration subsystem 4 comprehensively considers concentration data from different locations provided by the monitoring well group, as well as factors such as groundwater flow velocity, and uses mathematical models for precise calculation. For reagent injection dosage calculation, the central control and integration subsystem 4 determines the dosage based on the type and concentration of contaminants, the stoichiometric relationship of the oxidation reaction, and a model established through previous experiments and practical engineering experience. Based on the calculation results, the central control and integration subsystem 4 automatically adjusts the program of the reagent injection subsystem 3. When an increase in reagent injection is needed, it sends a command to the intelligent control device 33 of the reagent injection subsystem 3, and the reagent injection pump 32 accordingly increases the injection speed and dosage. Conversely, if the calculation results indicate that the reagent injection dosage is too high, it reduces the injection speed and dosage to avoid waste of reagents and potential adverse environmental impacts. This achieves a reaction equilibrium, which helps to form a stable hydrochemical oxidation reaction zone 6. Furthermore, the central control integrated subsystem 4 also has remote monitoring and fault diagnosis functions, allowing relevant personnel to promptly identify and resolve problems, ensuring the stable operation of the entire system.

[0032] This invention relates to an intelligent groundwater remediation system based on the hydraulic oxidation reaction zone 6. Through the coordination of various subsystems and the regulation of the overall control integrated subsystem, it can efficiently and accurately remediate groundwater pollution, providing strong technical support for the protection of groundwater resources and the ecological environment.

[0033] This invention utilizes a groundwater detector to monitor the type and concentration of groundwater pollutants in real time. The integrated control subsystem 4 precisely calculates and adjusts the injection volume and type of reagent in the injection subsystem 3. This precise, targeted injection method avoids the problems of excessive or insufficient reagents in traditional remediation methods, improving reagent utilization efficiency and more effectively decomposing pollutants, achieving precise control of the pollution plume. The system employs an oxidizing agent as the core to form a pollutant "barrier wall," rapidly decomposing organic molecular pollutants into harmless small molecules, curbing the spread of pollution at its source and ensuring the safety of the surrounding groundwater environment. Simultaneously, the entire remediation system integrates the groundwater circulation well subsystem 1, the injection subsystem 3, the monitoring subsystem 2, and the integrated control subsystem 4, achieving integration, automation, and intelligence throughout the remediation process. This replaces traditional manual sampling, detection, and operation, improving work efficiency, reducing human error, and enabling real-time and comprehensive acquisition of groundwater pollution information, promoting efficient and controllable remediation processes, and greatly minimizing human intervention, making it particularly suitable for remediation sites with complex terrain.

[0034] The system of this invention can flexibly change the treatment strategy according to different geological conditions and pollution levels, such as changes in reagents, groundwater circulation well injection locations, and monitoring target pollutants, demonstrating strong adaptability and flexibility, and is applicable to multiple sites.

[0035] Any aspects not described in this invention are applicable to existing technologies.

[0036] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A groundwater remediation system based on the oxidation reaction zone, characterized in that, The system includes a central control and integration subsystem, a groundwater circulation well subsystem, a chemical injection subsystem, and a monitoring subsystem. The groundwater circulation well subsystem comprises several groundwater circulation wells distributed downstream of the contaminated area. Each groundwater circulation well forms a vertically flowing hydraulic influence zone in its respective vertical region. The hydraulic influence zones corresponding to multiple groundwater circulation wells are connected in series to form a hydraulic oxidation reaction zone. The monitoring subsystem monitors the groundwater quality data upstream and downstream of the groundwater circulation wells and transmits the monitoring data to the central control and integration subsystem. The central control and integration subsystem controls the chemical injection subsystem based on the monitoring data, adjusting the chemical injection parameters of each groundwater circulation well.

2. The groundwater remediation system based on the oxidation reaction zone according to claim 1, characterized in that, The hydraulic influence zones formed by adjacent groundwater circulation wells partially overlap.

3. The groundwater remediation system based on the oxidation reaction zone according to claim 1, characterized in that, The monitoring subsystem includes an early warning monitoring well, a warning monitoring well, and a detector. The early warning monitoring well is located upstream of the groundwater circulation well, and the warning monitoring well is located downstream of the groundwater circulation well. The early warning monitoring well and the warning monitoring well are equipped with detectors to monitor the groundwater quality data upstream and downstream of the groundwater circulation well, respectively.

4. The groundwater remediation system based on the oxidation reaction zone according to claim 3, characterized in that, Multiple early warning monitoring wells and multiple warning monitoring wells are provided. Groundwater within the monitoring range of the early warning monitoring wells first flows through the hydraulic oxidation reaction zone and then flows through the distribution area of ​​the warning monitoring wells.

5. The groundwater remediation system based on the oxidation reaction zone according to claim 1, characterized in that, The chemical injection subsystem includes a chemical storage device, a chemical injection pump, and an intelligent control device. The chemical storage device stores oxidizing agents corresponding to groundwater pollutants. The inlet of the chemical injection pump is connected to the chemical storage device, and its outlet is connected to each of the groundwater circulation wells. The intelligent control device is connected to the overall control integration subsystem, receives control commands from the overall control integration subsystem, and controls the amount and speed of chemical injected by the chemical injection pump into each of the groundwater circulation wells.

6. The groundwater remediation system based on the oxidation reaction zone according to claim 5, characterized in that, The central control integrated subsystem calculates the reagent injection data based on the collected groundwater pollution type and concentration, and instructs the intelligent control device to regulate the type and amount of reagent injected.

7. The groundwater remediation system based on the oxidation reaction zone according to any one of claims 1-6, characterized in that, Each of the aforementioned groundwater circulation wells is equipped with a separator that divides the interior of the groundwater circulation well into an extraction area and an injection area, and adopts an upward extraction and downward injection or upward injection and downward extraction method depending on the contaminated site conditions and the form of the reagent.

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