Piezoelectric catalytic assembly and groundwater remediation system

Abstract

This invention relates to the field of water remediation technology, specifically to a piezoelectric catalytic component and a groundwater remediation system. The piezoelectric catalytic component includes: an upper part of a piezoelectric catalytic body with a spiral channel communicating with an inlet, and a lower part with a cavity; the cross-sectional diameter of the spiral channel gradually decreases from the inlet to the end; a column is provided in the cavity, and a piezoelectric film is spirally wound around the column; the end of the spiral channel is close to the piezoelectric film at the upper end of the column; the piezoelectric film receives water containing organic pollutants flowing in from the spiral channel and catalytically degrades the organic pollutants through piezoelectric conversion; this application combines the static pressure of the water flow, accelerates the water flow through the spiral channel, the flow velocity gradually increases from top to bottom, the hydraulic impact load is correspondingly enhanced, the mechanical force flowing through the piezoelectric film is increased, low-frequency vibration excites the piezoelectric catalytic effect, maximizes the catalytic degradation capacity of the piezoelectric material, and thus improves the catalytic degradation efficiency of the piezoelectric material.

Description

Technical Field

[0001] This invention relates to the field of water remediation technology, specifically to a piezoelectric catalytic component and a groundwater remediation system. Background Technology

[0002] Currently, piezoelectric sensors made from piezoelectric materials are widely used in various electronic devices in high-tech industries such as satellite broadcasting, electronic equipment, biology, and aerospace. In existing water treatment process research, high-frequency ultrasonic vibration can be used as an independent driving force to drive the catalytic degradation of piezoelectric materials. Under the action of high-frequency ultrasonic vibration, the piezoelectric potential generated by the piezoelectric material increases significantly with the increase of ultrasonic frequency, exhibiting a significant degradation effect on organic pollutants in the aquatic environment. However, applying high-frequency vibration to the aquatic environment requires additional energy, significantly increasing the cost of water treatment. For groundwater with very low flow velocities, relying solely on low-frequency hydraulic vibration to provide mechanical force for the piezoelectric material is insufficient to guarantee the catalytic degradation efficiency of the piezoelectric material. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect that, for groundwater with very low flow velocity, it is difficult to guarantee the catalytic degradation efficiency of piezoelectric materials by relying solely on the low-frequency vibration of water to provide mechanical force for piezoelectric materials.

[0004] To achieve the above objectives, the present invention provides a piezoelectric catalytic component, comprising:

[0005] The piezoelectric catalyst body has a vertically arranged spiral channel in the upper half that communicates with the water inlet, and a cavity with an open lower end in the lower half of the piezoelectric catalyst body; the cross-sectional diameter of the spiral channel gradually decreases from the water inlet to the end; a vertical column is provided in the cavity, and a piezoelectric film is spirally wrapped around the column; the end of the spiral channel is close to the piezoelectric film at the upper end of the column.

[0006] The piezoelectric film is adapted to receive water containing organic pollutants flowing in from the spiral channel and to catalytically degrade the organic pollutants through piezoelectric conversion.

[0007] Optionally, the piezoelectric film is a piezoelectric material attached to an electrospun film.

[0008] Optionally, the area of ​​the piezoelectric film gradually increases from top to bottom.

[0009] Optionally, the piezoelectric film is supported and fixed by a rod that surrounds and is fixed to the outer periphery of the column.

[0010] Optionally, the rod is a metal rod.

[0011] Optionally, the piezoelectric catalyst body is integrally fabricated.

[0012] The present invention also provides a groundwater remediation system, comprising:

[0013] The piezoelectric catalytic component mentioned above.

[0014] Optionally, it also includes:

[0015] The groundwater circulation well is divided into a first screen section at the top and a second screen section at the bottom by a packer; a first screen hole structure is provided on the well wall of the first screen section, and a second screen hole structure is provided on the well wall of the second screen section; the piezoelectric catalytic component is located in the first screen section;

[0016] An injection pump, located on the ground, is adapted to extract groundwater from the second screen section through a pumping pipeline and then inject it into the inlet of the piezoelectric catalytic component through an injection pipeline.

[0017] Optionally, the piezoelectric catalytic component is suspended in the first sieve section by a fixing device set on the ground.

[0018] Optionally, the outer periphery of the piezoelectric catalytic component is connected to the well wall of the first sieve section via a flexible element.

[0019] The technical solution of the present invention has the following advantages compared with the prior art:

[0020] 1. The piezoelectric catalytic component provided by the present invention includes: a piezoelectric catalytic body, the upper half of which is provided with a vertically arranged spiral channel communicating with a water inlet, and the lower half of the piezoelectric catalytic body having a cavity with an opening at the lower end; the cross-sectional diameter of the spiral channel gradually decreases from the water inlet to the end; a vertical column is provided in the cavity, and a piezoelectric film is spirally wound around the column; the end of the spiral channel is close to the piezoelectric film at the upper end of the column; the piezoelectric film is adapted to receive water containing organic pollutants flowing in from the spiral channel, and to catalytically degrade the organic pollutants through piezoelectric conversion; the present application adopts the above technical solution, combined with the static pressure of the water flow, accelerates the water flow through the spiral channel, the flow velocity gradually increases from top to bottom, the hydraulic impact load is correspondingly enhanced, the mechanical force flowing through the piezoelectric film is increased, low-frequency vibration excites the piezoelectric catalytic effect, maximizes the catalytic degradation ability of the piezoelectric material, and thus improves the catalytic degradation efficiency of the piezoelectric material. Furthermore, the hydro-induced piezoelectric catalytic degradation method is green and pollution-free. During the entire catalytic degradation process, the piezoelectric material is not consumed and can be recycled and reused, thus achieving the long-term effect of piezoelectric catalysis.

[0021] 2. The piezoelectric film of the present invention is a piezoelectric material attached to an electrospun film; the present application adopts the above technical solution, the electrospun film has a huge contact area and flexibility, increases the reaction surface and mechanical energy of the piezoelectric material, and does not require additional high voltage polarization and mechanical stretching, increasing the catalytic degradation ability, so that the piezoelectric film can produce huge deformation under small mechanical vibration, thereby strengthening the catalytic degradation ability of the piezoelectric material, that is, realizing the efficient catalytic reaction of the small vibration generated by water flow.

[0022] 3. The area of ​​the piezoelectric film in this invention gradually increases from top to bottom; this application adopts the above technical solution to increase the contact area between the piezoelectric film and the water flow, so that the water flow and the piezoelectric film are in full contact. Under the conditions of coupling of water flow and hydrostatic pressure, the piezoelectric film realizes the catalytic degradation of organic pollutants through the piezoelectric conversion law.

[0023] 4. The piezoelectric film of the present invention is supported and fixed by a rod that surrounds and is fixed to the outer periphery of the column; the present application adopts the above technical solution to reliably fix the piezoelectric film.

[0024] 5. The rod described in this invention is a metal rod; this application adopts the above technical solution to ensure that the rod has sufficient strength.

[0025] 6. The piezoelectric catalyst body of the present invention is integrally manufactured; the above technical solution is adopted in this application to reduce the risk of water leakage and ensure that the water flow is completely through the inlet to achieve water flow acceleration.

[0026] 7. The groundwater remediation system provided by the present invention includes: the piezoelectric catalytic component; the present application adopts the above technical solution to couple groundwater remediation with the piezoelectric catalytic component, and the advantages of the two work synergistically to enhance the catalytic degradation efficiency, achieving a 1+1>2 effect.

[0027] 8. The groundwater remediation system provided by the present invention further includes: a groundwater circulation well, divided by a packer into a first screen section at the top and a second screen section at the bottom; a first screen hole structure is provided on the well wall of the first screen section, and a second screen hole structure is provided on the well wall of the second screen section; the piezoelectric catalytic component is located in the first screen section; an injection pump is installed on the ground, the injection pump being adapted to extract groundwater from the second screen section through a pumping pipeline, and then inject it into the inlet of the piezoelectric catalytic component through an injection pipeline; the present application adopts the above technical solution, utilizing the three-dimensional hydraulic flow field (belonging to mechanical energy) generated by the groundwater circulation well to achieve in-situ low-disturbance catalytic degradation of organic pollutants in the groundwater environment; it solves the dependence of traditional in-situ groundwater remediation technology on external materials and energy, and utilizes mechanical force to excite piezoelectric materials to achieve catalytic degradation under green and low-carbon conditions, effectively reducing the energy cost, material cost, and labor cost of in-situ chemical oxidation and other technologies. This application's technical solution effectively overcomes the limitations of traditional in-situ remediation technologies imposed by the hypoxic, low-temperature, and low-disturbance environmental conditions of groundwater. Piezoelectric materials enable green catalytic degradation in darkness, under hypoxic conditions, and with self-powered energy. This application couples the hydraulic regulation of groundwater circulation wells with piezoelectric catalytic components. The groundwater circulation wells can fully mobilize the hydraulic circulation efficiency of groundwater to increase mechanical force, thereby fully stimulating the piezoelectric catalytic capacity of the components and improving degradation efficiency; that is, the advantages of both synergistically enhance catalytic degradation efficiency, achieving a 1+1>2 effect. This application utilizes the coupling of groundwater flow and static pressure driven by groundwater circulation wells, simultaneously leveraging the advantages of both circulation wells and piezoelectric catalysis to increase piezoelectric catalytic degradation efficiency.

[0028] 9. The piezoelectric catalytic component of the present invention is suspended in the first sieve section by a fixing member set on the ground; the present application adopts the above technical solution to reliably fix the piezoelectric catalytic component.

[0029] 10. The outer periphery of the piezoelectric catalytic component of the present invention is connected to the well wall of the first screen section through a flexible elastic element; the present application adopts the above technical solution to further reliably fix the piezoelectric catalytic component. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art 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.

[0031] Figure 1 This is a perspective structural diagram of the piezoelectric catalytic component provided in an embodiment of the present invention;

[0032] Figure 2This is a perspective structural diagram of the upper part of the piezoelectric catalytic component provided in an embodiment of the present invention;

[0033] Figure 3 This is a partial perspective view of the lower half of the piezoelectric catalytic component provided in an embodiment of the present invention.

[0034] Figure 4 This is a schematic diagram of the layout structure of the groundwater remediation system provided in an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Piezoelectric catalytic component; 2. Piezoelectric catalytic body; 3. Spiral channel; 4. Inlet; 5. Column; 6. Piezoelectric film; 7. Groundwater circulation well; 8. Packer; 9. First sieve section; 10. Second sieve section; 11. First sieve hole structure; 12. Second sieve hole structure; 13. Pump; 14. Pumping pipeline; 15. Injection pipeline; 16. Fixing component; 17. Flexible component. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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 connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] The discharge of waste gas, wastewater, and solid waste, as well as accidental leaks, leads to the entry of large amounts of organic pollutants into the soil, thereby contaminating the groundwater in and around the refinery. Due to the characteristics of groundwater, such as low ambient temperature, lack of sunlight, transport within the medium, and nutrient deficiency, many remediation methods used for surface water are difficult to apply to groundwater treatment. Therefore, it is necessary to research more targeted methods applicable to the specific environment of groundwater to degrade and remove pollutants. For traditional in-situ treatment technologies, the catalytic degradation of pollutants in the aquatic environment relies heavily on the input of matter and energy. For example, traditional chemical oxidation technology, persulfate advanced oxidation technology, photocatalytic degradation of organic pollutants in groundwater, as well as electrochemical catalytic oxidation and bioremediation are all currently very active research areas in groundwater in-situ remediation. In particular, in recent years, the composition of groundwater pollution has become increasingly complex, with new pollutants and other recalcitrant pollutants gradually accumulating, making traditional in-situ treatment technologies ineffective in degradation. Therefore, there is an urgent need to develop new, long-term, and stable groundwater treatment technologies.

[0042] The persulfate advanced oxidation technology in traditional chemical oxidation technology mainly degrades toxic and recalcitrant organic pollutants. It utilizes the reaction system to generate strong oxidizing free radicals, which degrade organic pollutants in water into small molecules, or even mineralize them into CO2, H2O and corresponding inorganic ions, thus completely removing pollutants. However, the persulfate in this method is chemically unstable, has a short duration of action, high energy consumption, and high maintenance costs. Furthermore, it does not completely degrade organic pollutants and is difficult to degrade pollutants effectively in the long term.

[0043] For in-situ chemical oxidation techniques for groundwater (e.g., using persulfate, H2O2, and MnO) 4- (etc.) It has minimal environmental impact, is relatively simple to operate, and has relatively mature technology, making it the fastest-growing and most widely applied groundwater remediation technology. However, due to the unstable chemical properties of oxidants such as persulfate and H2O2, they are consumed in large quantities by non-target reactions within the formation, resulting in very limited degradation efficiency for recalcitrant organic pollutants. MnO 4- The MnO2 generated by the reaction is prone to precipitation, which can clog the pores of the underground medium and make subsequent treatment difficult.

[0044] Fenton-like oxidation methods have strong oxidizing power, fast reaction speed, and no secondary pollution, but they have low catalytic activity, narrow pH operating range, are difficult to recover, have high operating costs, and require the addition of external chemical substances.

[0045] Although ozone oxidation has a high oxidation-reduction potential and can oxidize most organic pollutants in polluted water, ozone is chemically unstable. The reaction between ozone oxidation and organic matter is selective, and it cannot completely decompose organic matter into CO2 and H2O. The products of ozone oxidation are often carboxylic acid organic compounds.

[0046] Electrochemical catalytic oxidation has a wide range of applications and high degradation efficiency. It has significant advantages for high-concentration, difficult-to-degrade, and toxic phenol-containing wastewater. However, this method is power-intensive, the electrode materials are mostly precious metals, resulting in high cost and anodic corrosion.

[0047] Photocatalytic degradation of organic pollutants in groundwater offers significant advantages. It can deeply oxidize most organic pollutants, decomposing over ten types of recalcitrant organic compounds into carbon dioxide and water under normal pressure. This method boasts advantages such as no secondary pollution, low cost, and stability in aqueous solutions, making it a promising green technology. However, photocatalysis requires light to provide energy. In the dark and low-temperature conditions of groundwater environments, photocatalysis is limited. In contrast, the hydraulically activated piezoelectric catalytic effect groundwater circulation well functional component described in this application is suitable for dark, low-temperature, and oxygen-deficient groundwater environments.

[0048] Bioremediation is a method of treating contaminated water by altering environmental conditions to stimulate microbial growth and degradation of target pollutants. In most cases, bioremediation is cheaper and more sustainable than other remediation alternatives. Most bioremediation processes involve redox reactions, requiring either the addition of electron acceptors (usually oxygen) to stimulate the oxidation of reducing pollutants (e.g., hydrocarbons) or electron donors (usually organic substrates) to reduce oxidizing pollutants (e.g., nitrates and perchlorates). This necessitates the addition of exogenous substances such as nutrients, vitamins, minerals, and pH buffers to optimize microbial conditions and create favorable degradation conditions. However, the low-temperature, low-oxygen groundwater environment is not suitable for microbial growth, making the piezoelectric catalytic degradation method for groundwater organic pollutants using hydraulic power, as described in this application, more applicable and innovative.

[0049] The technology described in this application differs from traditional adsorption and H2O2 oxidation technologies that rely on external matter and energy input. Piezoelectric catalysis technology can generate a piezoelectric potential through mechanical energy such as vibration, friction, natural wind, and tides, continuously triggering the reaction of •OH and •O. 2-In-situ generation and degradation of pollutants using reactive free radicals is a promising green and sustainable catalytic technology. Recent studies have shown that organic pollutants induced by high-frequency mechanical energy (such as ultrasound) exhibit highly efficient piezoelectric catalytic performance. For example, ultrasound-induced multi-defect MoS2 nanosheets can remove 99% of ciprofloxacin within 30 seconds, exhibiting excellent cycle stability and recyclability. The piezoelectric potential generated by the deformation of BaTiO3 nanoparticles can not only successfully degrade 4-chlorophenol but also effectively dechlorinate it simultaneously; ultrasound-induced MoSe2 nanoflowers in a light-protected environment can remove 90% of rhodamine B (RhB) within 30 seconds, with a kinetic rate constant as high as 69889 × 10⁻⁶. -6 L / (mol·s) is the fastest reported degradation rate in the dark. These findings confirm that piezoelectric catalysis offers advantages in surface water treatment processes, including high efficiency, sustainability, stability, simple operation, and cost-effectiveness. Combined with recent research on piezoelectric materials, this technology can be extended to groundwater environments characterized by darkness, low temperature, and low oxygen levels. To this end, this application proposes a hydraulically activated piezoelectric catalytic enhancement treatment device, utilizing the low-frequency mechanical energy generated by the three-dimensional circulating water flow in a groundwater well, such as high hydrostatic pressure and the minute vibrations produced by the water flow. A piezoelectric material with a special structure converts this mechanical energy into electrical energy, driving charge carriers to generate reactive oxygen species (ROS, such as H2O2 and •OH), thereby inducing a strong catalytic effect, degrading organic pollutants, and achieving efficient removal of organic pollutants from groundwater.

[0050] Groundwater circulation well technology is an in-situ remediation technology with advantages such as low cost, ease of operation, and minimal site disturbance. Furthermore, it can be flexibly coupled with other technologies to further enhance the catalytic efficiency of pollutants. For example, it can be integrated with technologies such as aeration, airlift, and stripping, effectively overcoming the disadvantages of traditional in-situ groundwater remediation, including large disturbances, long extraction and treatment cycles, high water treatment costs, small radius of influence of aeration treatment, low removal rates, and secondary pollution caused by chemical oxidation. It is an environmentally friendly technology. This groundwater circulation well technology is widely used abroad and has broad application prospects in groundwater remediation in China. With the rapid development of the global economy, soil and groundwater pollution problems are becoming increasingly serious, making the development of green and low-carbon remediation equipment and technologies particularly important. This application designs a hydraulically activated piezoelectric catalytic effect groundwater circulation well functional component to enhance the catalytic degradation of organic pollutants in groundwater, which is of great significance for further promoting the application of groundwater circulation well technology in my country.

[0051] Traditional in-situ groundwater remediation technologies rely heavily on external energy sources, and different technologies have various requirements regarding the environmental conditions of groundwater, resulting in high levels of manpower, energy, and material consumption. This application utilizes piezoelectric catalysis to continuously generate active free radicals under mechanical force, degrading organic pollutants in groundwater without requiring additional external energy. This provides a solution for the application of self-powered catalysis (such as utilizing natural water circulation) in groundwater pollution remediation.

[0052] Currently, the application of piezoelectric catalysis mainly focuses on surface water treatment. The mechanical energy that excites the piezoelectric catalytic effect is limited to high-frequency vibrational mechanical energy such as ultrasound. There is relatively little attention paid to the application of piezoelectric materials in groundwater under anoxic, low-temperature, and low-disturbance environments. Many applications in piezoelectric energy and piezoelectric medicine have demonstrated that the catalytic degradation process of piezoelectric materials does not require oxygen and can proceed in darkness. The inherent stability of piezoelectric materials allows the entire degradation process to continue stably and continuously over a long period, and the materials can be recycled indefinitely without loss. Piezoelectric catalysis technology can continuously generate active free radicals under mechanical force to degrade organic pollutants, making self-powered (such as wind, tides, and water flow in natural environments) catalytic applications possible. It shows significant advantages in surface water treatment processes. This application extends this technology to the groundwater environment, utilizing the hydraulic regulation of circulating wells to construct a hydraulically excited piezoelectric catalytic system for the degradation of organic pollutants in groundwater.

[0053] Single-loop well technology has limited effectiveness in treating organic pollutants and a long operating cycle. Different types of pollutants require different treatment methods; therefore, for specific types of pollutants, coupling the loop well with components of different characteristics or adding targeted fillers and materials will improve the treatment effect and efficiency. To avoid secondary pollution and achieve the highest possible degradation efficiency, selecting a green, environmentally friendly, and highly efficient degradation material is crucial. The piezoelectric material in this application is green and environmentally friendly, with no material loss, does not generate secondary pollution, and can maintain a high degradation efficiency for unlimited recycling.

[0054] like Figures 1 to 3 One specific embodiment of the piezoelectric catalytic component shown includes: a piezoelectric catalytic body 2.

[0055] The upper half of the piezoelectric catalytic body 2 is provided with a vertically arranged spiral channel 3 communicating with the inlet 4. The lower half of the piezoelectric catalytic body 2 has a cavity with an open lower end, which can be formed by a metal shell. The cross-sectional diameter of the spiral channel 3 gradually decreases from the inlet 4 to the end. A vertical column 5 is provided in the cavity, located at the center of the cavity. A piezoelectric film 6 is spirally wound around the column 5. The end of the spiral channel 3 is positioned close to the piezoelectric film 6 at the upper end of the column 5. The piezoelectric film 6 is adapted to receive water containing organic pollutants flowing in from the spiral channel 3, and catalytically degrades the organic pollutants through piezoelectric conversion. Recent research results show that the piezoelectric response is not linearly related to the applied vibration frequency. With a suitable crystal structure, the piezoelectric material can also produce the best deformation under the action of external force within a certain vibration frequency range, thus obtaining the best piezoelectric response. Therefore, this application can utilize piezoelectric materials with a structure of high inherent polarization to more effectively capture the low-frequency vibration mechanical energy of water flow, and realize the effective induction of piezoelectric catalytic degradation of organic pollutants in the aquatic environment by low-frequency vibration mechanical energy without energy input.

[0056] Furthermore, the piezoelectric film 6 is a piezoelectric material attached to an electrospun film. The area of ​​the piezoelectric film 6 gradually increases from top to bottom. Specifically, multiple piezoelectric films 6 can be fixed to a spiral metal holder, forming a series structure between the multiple piezoelectric films 6, and the diameter of the piezoelectric films 6 gradually increases from the inlet to the outlet. The piezoelectric catalyst body 2 is integrally manufactured. Specifically, the piezoelectric film 6 is supported and fixed by a rod that surrounds and is fixed to the outer periphery of the column 5. The rod can be a metal rod. Correspondingly, the length of the metal rod gradually increases to fix the gradually increasing piezoelectric film 6.

[0057] The main working process of the piezoelectric catalytic component described in this application is briefly described as follows: After the water flows through the spiral channel 3 with a gradually decreasing diameter, the combined effect of gravity and centrifugal force increases the water flow velocity, thereby enhancing the mechanical force exerted on the piezoelectric film 6. The water then flows through the piezoelectric film 6, making full contact with it. Under the coupled conditions of water flow and hydrostatic pressure, the piezoelectric material attached to the electrospun film achieves the catalytic degradation of organic pollutants through piezoelectric conversion.

[0058] like Figure 4 One specific embodiment of the groundwater remediation system shown includes: a groundwater circulation well 7 and a piezoelectric catalyst assembly 1 disposed in the groundwater circulation well 7, and an injection pump 13.

[0059] The groundwater circulation well 7 is divided by a packer 8 into an upper first screen section 9 and a lower second screen section 10. A first screen hole structure 11 is provided on the well wall of the first screen section 9, and a second screen hole structure 12 is provided on the well wall of the second screen section 10. The piezoelectric catalytic component 1 is located within the first screen section 9. The pump 13 is located on the ground surface and is adapted to pump groundwater from the second screen section 10 through a pumping pipe 14 and then inject it into the inlet 4 of the piezoelectric catalytic component 1 through an injection pipe 15. Specifically, the piezoelectric catalytic component 1 is suspended within the first screen section 9 by a fixing member 16 located on the ground surface. The outer periphery of the piezoelectric catalytic component 1 is connected to the well wall of the first screen section 9 by a flexible elastic member 17. Figure 4 The arrows in the diagram indicate the direction of groundwater flow.

[0060] The main working process of the groundwater remediation system described in this application is briefly described as follows: Groundwater forms a circulating flow field around the groundwater circulation well 7 by means of the pumping pump 13; external groundwater continuously flows in from the second screen structure 12, and under the action of the pumping pipeline 14 and the injection pipeline 15, in the first screen section 9, with the help of the water flow mechanical force provided by the groundwater circulation well 7 and the hydrostatic pressure present in the groundwater, the piezoelectric film 6 in the piezoelectric catalytic component 1 is jointly activated to carry out piezoelectric catalytic degradation.

[0061] 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 piezoelectric catalytic component, characterized in that, include: The piezoelectric catalyst body (2) has a vertically arranged spiral channel (3) in the upper half that communicates with the water inlet (4), and a cavity with an opening at the lower end in the lower half of the piezoelectric catalyst body (2); the cross-sectional diameter of the spiral channel (3) gradually decreases from the water inlet (4) to the end; a vertical column (5) is provided in the cavity, and a piezoelectric film (6) is spirally wrapped around the column (5); the end of the spiral channel (3) is close to the piezoelectric film (6) at the upper end of the column (5); The piezoelectric film (6) is adapted to receive water containing organic pollutants flowing in from the spiral channel (3) and to catalytically degrade the organic pollutants through piezoelectric conversion. The piezoelectric film (6) is a piezoelectric material attached to an electrospun film; The area of ​​the piezoelectric film (6) gradually increases from top to bottom.

2. The piezoelectric catalytic component according to claim 1, characterized in that, The piezoelectric film (6) is supported and fixed by a rod that surrounds and is fixed to the outer periphery of the column (5).

3. The piezoelectric catalytic component according to claim 2, characterized in that, The rod is a metal rod.

4. The piezoelectric catalytic component according to claim 1, characterized in that, The piezoelectric catalyst body (2) is fabricated as a single unit.

5. A groundwater remediation system, characterized in that, include: The piezoelectric catalytic component (1) according to any one of claims 1-4.

6. The groundwater remediation system according to claim 5, characterized in that, Also includes: The groundwater circulation well (7) is divided into a first screen section (9) at the top and a second screen section (10) at the bottom by a packer (8); a first screen hole structure (11) is provided on the well wall of the first screen section (9), and a second screen hole structure (12) is provided on the well wall of the second screen section (10); the piezoelectric catalytic component (1) is located in the first screen section (9); The pump (13) is located on the ground and is adapted to pump the groundwater in the second screen section (10) through the pumping pipeline (14) and then inject it into the inlet (4) of the piezoelectric catalytic component (1) through the injection pipeline (15).

7. The groundwater remediation system according to claim 6, characterized in that, The piezoelectric catalytic component (1) is suspended in the first sieve section (9) by a fixing member (16) set on the ground.

8. The groundwater remediation system according to claim 7, characterized in that, The outer periphery of the piezoelectric catalytic component (1) is connected to the well wall of the first sieve section (9) via a flexible elastic element (17).

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