A dielectric barrier discharge system for soil purification or fertilization

Abstract

The present invention discloses a dielectric barrier discharge system for soil purification or fertilization, comprising a soil storage unit, a surface / bulk composite dielectric barrier discharge plasma unit, a soil receiving unit, a high-voltage power supply, and a feedback regulation unit. The soil storage unit is used to store contaminated soil, transfer the contaminated soil to the surface / bulk composite dielectric barrier discharge plasma unit for discharge remediation, and transfer the remediated soil to the soil receiving unit. The high-voltage power supply provides power to the surface / bulk composite dielectric barrier discharge plasma unit. The feedback regulation unit is provided on the surface / bulk composite dielectric barrier discharge plasma unit and is used to monitor the discharge process of the surface / bulk composite dielectric barrier discharge plasma unit. The present invention facilitates large-scale production of contaminated soil degradation using surface / bulk composite dielectric barrier plasma.

Description

Technical Field

[0001] The present invention belongs to the field of agricultural technology, and in particular relates to a dielectric barrier discharge system for soil purification or fertilization. Background Art

[0002] Soil remediation involves restoring contaminated soil to a specified environmental quality standard through a combination of physical, chemical, and biological methods, thereby reducing or eliminating the harmful effects of pollutants on the soil and the environment. Dielectric barrier discharge, also known as "silent discharge," is a type of gas discharge in which an insulating dielectric is inserted into the discharge space. In this process, the dielectric can be applied to the electrode surface or suspended in the discharge space. When a sufficiently high AC voltage is applied, the gas between the electrodes breaks down, causing a discharge and generating plasma. Using plasma for soil remediation offers advantages such as high treatment efficiency, fast processing time, the absence of chemical reagents, zero secondary pollution, and operation at room temperature and pressure.

[0003] Chinese application publication number CN116251830A discloses a method for degrading pollutants in soil using dielectric barrier discharge in conjunction with spinel oxides. This method uses dielectric barrier discharge in conjunction with the spinel oxide MnFe2O4 to treat organically contaminated soil. However, this application adds a soil pretreatment step before treatment, and the treatment system is only suitable for batch treatment of small amounts of soil, failing to meet the continuous reaction requirements required for large quantities of soil in practical applications. Chinese application publication number CN114273415A discloses an in-situ chemical oxidation remediation system, method, and application for organically contaminated soil. This method uses active species generated by a discharge plasma generator to remediate organically contaminated soil. However, this application requires burying the plasma generator in the soil to achieve in-situ chemical reactions, which poses operational difficulties and a low degree of automation in practical applications. Summary of the Invention

[0004] In response to the problems existing in the prior art, the present invention provides a dielectric barrier discharge system for soil purification or fertilization, which is simple to operate, low in cost, and easy to implement on a large scale to degrade contaminated soil using low-temperature surface / volume dielectric barrier plasma.

[0005] To achieve the above technical objectives, the present invention adopts the following technical solution: a dielectric barrier discharge system for soil purification or fertilization, comprising: a soil storage unit, a surface / bulk composite dielectric barrier discharge plasma unit, a soil receiving unit, a high-voltage power supply, and a feedback regulation unit. The soil storage unit is used to store contaminated soil, transfer the contaminated soil to the surface / bulk composite dielectric barrier discharge plasma unit for discharge remediation, and transfer the remediated soil to the soil receiving unit; the high-voltage power supply provides power to the surface / bulk composite dielectric barrier discharge plasma unit; the feedback regulation unit is disposed on the surface / bulk composite dielectric barrier discharge plasma unit, and is used to monitor the discharge process of the surface / bulk composite dielectric barrier discharge plasma unit.

[0006] Furthermore, an opening is provided at the lower side of the soil storage unit, and the opening of the soil storage unit is connected to the surface / bulk composite dielectric barrier discharge plasma unit; an opening is provided at the upper side of the soil receiving unit, and the opening of the soil receiving unit is connected to the surface / bulk composite dielectric barrier discharge plasma unit; an ultrasonic oscillator is provided on the surface / bulk composite dielectric barrier discharge plasma unit to disperse the soil on the surface / bulk composite dielectric barrier discharge plasma unit.

[0007] Furthermore, the inclination angle of the surface / body composite dielectric barrier discharge plasma unit is 5°-45°.

[0008] Furthermore, the surface / volume composite dielectric barrier discharge plasma unit includes: upper insulating glass, lower insulating glass, a first strip-shaped high-voltage electrode and a first insulating layer, wherein the first strip-shaped high-voltage electrode and the first insulating layer are alternately arranged to form a high-voltage electrode, the upper end of the high-voltage electrode is connected to the lower end of the opening of the soil storage unit, and the lower end of the high-voltage electrode is connected to the lower end of the opening of the soil receiving unit; the upper insulating glass is arranged above the high-voltage electrode, and the two ends of the upper insulating glass are respectively fixedly connected to the soil storage unit and the soil receiving unit; the lower insulating glass is arranged below the high-voltage electrode, and the two ends of the lower insulating glass are respectively fixedly connected to the soil storage unit and the soil receiving unit; the upper surface of the upper insulating glass and the lower surface of the lower insulating glass are both grounded; and an ultrasonic oscillator is provided on the lower side of the high-voltage electrode.

[0009] Furthermore, a support plate is provided below the soil storage unit, a funnel-shaped opening is provided below the soil storage unit, one end of the surface / body composite dielectric barrier discharge plasma unit is located below the funnel-shaped opening, and the other end of the surface / body composite dielectric barrier discharge plasma unit extends into the opening of the soil receiving unit; the surface / body composite dielectric barrier discharge plasma unit is arranged horizontally, and a conveyor belt is used to transport the repaired soil to the soil receiving unit.

[0010] Furthermore, the surface / body composite dielectric barrier discharge plasma unit includes: a ground electrode, a second insulating layer, a second strip-shaped high-voltage electrode, a metal pulley, a motor and a fixed frame, the two metal pulleys are arranged horizontally, and the ground electrode is sleeved on the metal pulley; the metal pulley located on one side of the soil storage unit is connected to the rotating shaft of the motor, and the axis of the metal pulley located on one side of the soil storage unit is connected to the fixed frame; the second insulating layer and the second strip-shaped high-voltage electrode are alternately connected to form a high-voltage electrode, the high-voltage electrode is arranged above the ground electrode, one end of the high-voltage electrode is fixedly connected to the upper end surface of the soil receiving unit, and the other end of the high-voltage electrode is fixedly connected to the soil storage unit.

[0011] Furthermore, a funnel-shaped opening is provided below the soil storage unit, the funnel-shaped opening is fixedly connected to the upper end of the surface / bulk composite dielectric barrier discharge plasma unit, and the lower end of the surface / bulk composite dielectric barrier discharge plasma unit is fixedly connected to the upper end opening of the soil receiving unit; the surface / bulk composite dielectric barrier discharge plasma unit is wavy; and an ultrasonic oscillator is provided on the surface / bulk composite dielectric barrier discharge plasma unit for dispersing the soil on the surface / bulk composite dielectric barrier discharge plasma unit.

[0012] Furthermore, the surface / volume composite dielectric barrier discharge plasma unit includes: a third strip-shaped high-voltage electrode, a strip-shaped grounding electrode and an insulating channel, wherein the insulating channel is wavy, the upper end opening of the insulating channel is fixedly connected to the funnel-shaped opening of the soil storage unit, and the lower end opening of the insulating channel is fixedly connected to the upper end opening of the soil receiving unit; the third strip-shaped high-voltage electrodes are arranged at equal intervals on one side of the insulating channel with the same folding direction, and the strip-shaped grounding electrodes are arranged at equal intervals on the other side; after changing the folding direction of the insulating channel, the arrangement positions of the third strip-shaped high-voltage electrode and the strip-shaped grounding electrode are exchanged; an ultrasonic oscillator is provided on the side wall of the insulating channel.

[0013] Furthermore, the feedback adjustment unit includes: a humidity sensor and four ultraviolet sensors, which respectively collect the spectral intensities of hydroxyl radicals, oxygen ions, nitrogen oxides and nitrogen gas. When soil purification is performed, the power supply frequency and power of the high-voltage power supply are adjusted to increase the spectral intensities of hydroxyl radicals and oxygen ions; when soil nitrogen fixation is performed, the power supply frequency and power of the high-voltage power supply are adjusted to increase the spectral intensity of nitrogen oxides; the humidity sensor is used to monitor the gas humidity along the surface / volume composite dielectric barrier discharge plasma unit in real time. If the gas humidity does not reach the set standard, the flow rate of the external gas source is adjusted until the gas humidity reaches the set standard.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The dielectric barrier discharge system for soil purification or fertilization of the present invention provides a surface / body composite dielectric barrier discharge plasma unit between a soil storage unit and a soil receiving unit, and discharge-repairs the contaminated soil through the surface / body composite dielectric barrier discharge plasma unit, thereby having the advantages of a large treatment area, a fast treatment speed, and a large single treatment volume;

[0016] (2) The dielectric barrier discharge system for soil purification or fertilization of the present invention monitors the discharge process of the surface / body composite dielectric barrier discharge plasma unit through a feedback adjustment unit. When the soil remediation situation needs to meet the purification or fertilization requirements, the power supply frequency and power of the high-voltage power supply can be adjusted, and the gas humidity can be adjusted to make it meet the specific soil fertilization requirement parameters. It has the advantages of soil fertilization parameters being settable, automatically controlled, and self-adaptive to working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the feedback regulation unit in the present invention;

[0018] Figure 2 Schematic diagram of the structure of the dielectric barrier discharge system for soil purification or fertilization in Example 1;

[0019] Figure 3 Schematic diagram of the soil remediation process of the dielectric barrier discharge system for soil purification or fertilization in Example 1;

[0020] Figure 4 Schematic diagram of the surface / body composite dielectric barrier discharge plasma unit in Example 1;

[0021] Figure 5 Schematic diagram of the structure of the dielectric barrier discharge system for soil purification or fertilization in Example 2;

[0022] Figure 6 Schematic diagram of the soil remediation process of the dielectric barrier discharge system for soil purification or fertilization in Example 2;

[0023] Figure 7 Schematic diagram of the surface / body composite dielectric barrier discharge plasma unit in Example 2;

[0024] Figure 8 Schematic diagram of the structure of the dielectric barrier discharge system for soil purification or fertilization in Example 3;

[0025] Figure 9 Schematic diagram of the soil remediation process of the dielectric barrier discharge system for soil purification or fertilization in Example 3;

[0026] Figure 10 This is a connection diagram of the UV sensor in the feedback regulation unit. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be further explained below with reference to the accompanying drawings.

[0028] The present invention provides a dielectric barrier discharge system for soil purification or fertilization, comprising: a soil storage unit 1, a surface / bulk composite dielectric barrier discharge plasma unit 2, a soil receiving unit 3, a high-voltage power supply, and a feedback regulation unit. The soil storage unit 1 is used to store contaminated soil, transfer the contaminated soil to the surface / bulk composite dielectric barrier discharge plasma unit 2 for discharge repair, and transfer the repaired soil to the soil receiving unit 3; the high-voltage power supply provides power to the surface / bulk composite dielectric barrier discharge plasma unit 2; the feedback regulation unit is arranged on the surface / bulk composite dielectric barrier discharge plasma unit 2, and the feedback regulation unit is used to monitor the discharge process of the surface / bulk composite dielectric barrier discharge plasma unit 2.

[0029] The high-voltage power supply in the present invention is a PDM high-voltage power supply, which drives discharge along the surface / volume composite dielectric barrier discharge plasma unit 2, generating various discharge products, including high-energy particles, positive and negative ions, hydroxyl radicals (OH), ozone (O3), and nitrogen oxides (NOx). These discharge products undergo redox reactions with toxic substances such as organic molecules, heavy metals, and pathogens in the contaminated soil, degrading soil pollutants. Furthermore, the nitrogen oxides produced during the discharge process react with air to form nitrogen fertilizer, thereby fixing nitrogen and increasing soil fertility.

[0030] Soil remediation and soil nitrogen fixation require different active substances. Soil remediation primarily relies on hydroxyl radicals and ozone, while soil nitrogen fixation primarily relies on nitrogen oxides. Accordingly, dielectric barrier discharge produces different concentrations of the same active substance at different discharge frequencies. By varying the discharge frequency, the ratio of active substances produced can be adjusted, thereby regulating the two modes.

[0031] To ensure that the discharge reaction area remains in optimal condition in both the soil remediation and soil nitrogen fixation modes, it is necessary to monitor the concentration of discharge products generated within the surface / volume composite dielectric barrier discharge plasma unit 2. The concentration of the discharge products can be represented by the intensity of the emission spectrum. Therefore, an ultraviolet sensor is used to monitor the spectral intensity of the discharge products in the discharge area. The ultraviolet sensor converts optical signals into electrical signals, so the voltage signal output by the ultraviolet sensor can be used to represent the relative concentration intensity of the type of discharge product generated. The ultraviolet sensor model in the present invention can be GT-UVV-L, GS-ABC-2835, or GS-AB-0603E.

[0032] The various discharge products generated during the discharge process of the surface / volume composite dielectric barrier discharge plasma unit 2 emit spectra of different wavelengths. The relative spectral intensity of the spectra can reflect the concentration of the corresponding substances: the wavelength of the hydroxyl radical OH is generally between 200-400nm, with a characteristic spectrum range of 309-318nm; the oxygen ion O + The characteristic spectrum of nitrogen is at 372.3 and 375.1 nm; the strongest wavelength of the spectrum of nitrogen N2 is 337 nm; the characteristic spectrum of NOx is 357.7 and 378.9 nm; the characteristic spectrum of N+ is 399.5 and 403.8 nm. In the soil remediation mode, the main focus is on the hydroxyl radical OH and oxygen ion O with extremely strong oxidizing properties. + In soil nitrogen fixation mode, the main focus is on the spectrum of nitrogen oxides NOx. The characteristic spectrum intensity is extremely high, indicating that the concentration of the active substance produced is extremely high. It is necessary to consider the spectral intensity of the light column and The relationship between the spectral intensity and the soil remediation mode can be determined by the proportion of hydroxyl radicals and oxygen ions in the above four substances.

[0033] Use four UV sensors to collect the relative intensity of the spectrum of the discharge material. Two filters should be placed in front of each UV sensor to filter out other spectra. Generally, the low-pass filter is placed in the front and the high-pass filter is placed in the back. To collect the OH spectrum, you can choose a UV bandpass filter with a central wavelength of 313nm and a bandwidth of 5nm; to collect O + For spectrum, you can choose a UV bandpass filter with a central wavelength of 373nm and a bandwidth of 2nm; for NOx spectrum, you can choose a UV bandpass filter with a central wavelength of 357nm and a bandwidth of 1nm; The spectrum can choose a UV bandpass filter with a central wavelength of 337nm and a bandwidth of 1nm. Figure 10 , connect the four UV sensor monitoring circuits in parallel to the digital-to-analog converter, and transmit the flip signal back to the four interfaces of the MCU. The digital-to-analog converter can use the 12-bit resolution AD5321 chip. The circuit for collecting the OH spectrum is connected to PG0 / ADC0, and its display voltage is ; Collection O + The spectrum circuit is connected to PG1 / ADC1, and its displayed voltage is The circuit for collecting NOx spectrum is connected to PG2 / ADC2, and its display voltage is ;collection The spectrum circuit is connected to PG3 / ADC3, and its displayed voltage is .

[0034] Let α be the observation ratio during soil remediation, ; β represents the observed ratio of soil nitrogen fixation, .

[0035] like Figure 1 When soil purification is performed, the power supply frequency and power of the high-voltage power supply are adjusted so that the surface / bulk composite dielectric barrier discharge plasma unit 2 is in the ozone mode, that is, α>>β; when soil nitrogen fixation is performed, the power supply frequency and power of the high-voltage power supply are adjusted so that the surface / bulk composite dielectric barrier discharge plasma unit 2 is in the nitrogen oxide mode, that is, β>>α; at the same time, the gas humidity of the surface / bulk composite dielectric barrier discharge plasma unit 2 is monitored in real time by a humidity sensor. If the gas humidity does not reach the set standard, the flow rate of the external gas source is adjusted until the gas humidity reaches the set standard, thereby putting the surface / bulk composite dielectric barrier discharge plasma unit 2 in the optimal state for treating pollutants.

[0036] Example 1

[0037] like Figure 2-3 This embodiment provides a dielectric barrier discharge system for soil purification or enrichment. A soil storage unit 1 has an opening at the lower side thereof, which connects to a surface / bulk composite dielectric barrier discharge plasma unit 2. A soil receiving unit 3 has an opening at the upper side thereof, which connects to the surface / bulk composite dielectric barrier discharge plasma unit 2. Contaminated soil undergoes flow remediation treatment within the surface / bulk composite dielectric barrier discharge plasma unit 2. An ultrasonic oscillator is provided within the surface / bulk composite dielectric barrier discharge plasma unit 2 to disperse soil on the surface / bulk composite dielectric barrier discharge plasma unit 2, preventing soil deposition during the remediation process.

[0038] like Figure 4In this embodiment, the surface / volume composite dielectric barrier discharge plasma unit 2 includes: an upper insulating glass 211, a lower insulating glass 212, a first strip-shaped high-voltage electrode 213, and a first insulating layer 214. The first strip-shaped high-voltage electrode 213 and the first insulating layer 214 are alternately arranged to form a high-voltage electrode. The high-voltage electrode is powered by a high-voltage power supply. The upper end of the high-voltage electrode is connected to the lower end of the opening of the soil storage unit 1, and the lower end of the high-voltage electrode is connected to the lower end of the opening of the soil receiving unit 3. The upper insulating glass 211 and the lower insulating glass have the same thickness. The upper insulating glass 211 is disposed above the high-voltage electrode, and the two ends of the upper insulating glass 211 are respectively fixedly connected to the soil storage unit 1 and the soil receiving unit 3. The lower insulating glass 212 is disposed below the high-voltage electrode, and the two ends of the lower insulating glass 212 are respectively fixedly connected to the soil storage unit 1 and the soil receiving unit 3. The discharge gap distance between the upper insulating glass 211 and the high-voltage electrode is 3.00 mm to 15.00 mm. The upper surface of the upper insulating glass 211 and the lower surface of the lower insulating glass 212 are both grounded.

[0039] Because the soil has a certain moisture content, to prevent soil from accumulating on the surface / bulk composite dielectric barrier discharge plasma unit 2, the surface / bulk composite dielectric barrier discharge plasma unit 2 is tilted at an angle of 5°-45°. An ultrasonic oscillator is installed on the lower side of the high-voltage electrode, allowing the treated soil to slide naturally under the action of gravity and ultrasonic vibration, preventing soil deposition and allowing the treated soil to quickly pass through the discharge treatment area and be fully treated. Simultaneously, when soil purification is being performed, the power supply frequency and power of the high-voltage power supply are adjusted to increase the spectral intensity of hydroxyl radicals and oxygen ions; when soil nitrogen fixation is being performed, the power supply frequency and power of the high-voltage power supply are adjusted to increase the spectral intensity of nitrogen oxides. A humidity sensor is used to monitor the gas humidity of the surface / bulk composite dielectric barrier discharge plasma unit 2 in real time. If the gas humidity does not meet the set standard, the flow rate of the external gas source is adjusted until the gas humidity reaches the set standard, thereby ensuring that the discharge reaction zone of the surface / bulk composite dielectric barrier discharge plasma unit 2 is in the optimal state for treating pollutants.

[0040] Example 2

[0041] like Figure 5This embodiment provides a dielectric barrier discharge system for soil purification or enrichment. A support plate 4 is provided below a soil storage unit 1, which has a funnel-shaped opening. One end of a surface / bulk composite dielectric barrier discharge plasma unit 2 is located below the funnel-shaped opening, and the other end of the surface / bulk composite dielectric barrier discharge plasma unit 2 extends into the opening of a soil receiving unit 3. The surface / bulk composite dielectric barrier discharge plasma unit 2 is arranged horizontally and uses a conveyor belt to transport the remediated soil to the soil receiving unit 3. When using this dielectric barrier discharge system to treat contaminated soil, the contaminated soil must meet certain dryness and coarseness requirements. Contaminated soil that meets these requirements is placed in the soil storage unit 1. The funnel-shaped bottom of the soil storage unit 1 facilitates uniform soil flow into the surface / bulk composite dielectric barrier discharge plasma unit 2 without excessive compression. A constant gap is maintained between the soil storage unit 1 and the surface / bulk composite dielectric barrier discharge plasma unit 2, ensuring a uniform thickness of treated soil.

[0042] like Figure 6-7 In this embodiment, the surface / body composite dielectric barrier discharge plasma unit 2 includes: a ground electrode 221, a second insulating layer 222, a second strip high-voltage electrode 223, a metal pulley 224, a motor and a fixed frame. The two metal pulleys 224 are arranged horizontally, one metal pulley 224 is located at the funnel-shaped opening below the soil storage unit 1, and the other metal pulley 224 extends into the opening of the soil receiving unit 3. The ground electrode 221 is sleeved on the metal pulley 224; the metal pulley 224 located on one side of the soil storage unit 1 is connected to the rotating shaft of the motor, and the axis of the metal pulley 224 located on one side of the soil storage unit 1 is connected to the fixed frame; the second insulating layer 222 and the second strip high-voltage electrode 223 are alternately connected to form a high-voltage electrode, which is powered by a high-voltage power supply. The high-voltage electrode is arranged above the ground electrode 221, and the discharge gap distance between the high-voltage electrode and the ground electrode 221 is 3.00 mm to 15.00 mm. mm, one end of the high-voltage electrode is fixedly connected to the upper end surface of the soil receiving unit 3, and the other end of the high-voltage electrode is fixedly connected to the soil storage unit 1.

[0043] When soil purification is performed, the power supply frequency and power of the high-voltage power supply are adjusted to increase the spectral intensity of hydroxyl radicals and oxygen ions; when soil nitrogen fixation is performed, the power supply frequency and power of the high-voltage power supply are adjusted to increase the spectral intensity of nitrogen oxides; and the gas humidity of the surface / bulk composite dielectric barrier discharge plasma unit 2 is monitored in real time through a humidity sensor. If the gas humidity does not meet the set standard, the flow rate of the external gas source is adjusted until the gas humidity meets the set standard, thereby ensuring that the discharge reaction zone of the surface / bulk composite dielectric barrier discharge plasma unit 2 is in the optimal state for treating pollutants.

[0044] Example 3

[0045] like Figure 8 This embodiment provides a dielectric barrier discharge system for soil purification or enrichment. A soil storage unit 1 has a funnel-shaped opening at its bottom, which is fixedly connected to the upper end of a surface / bulk composite dielectric barrier discharge plasma unit 2. The lower end of the surface / bulk composite dielectric barrier discharge plasma unit 2 is fixedly connected to the upper opening of a soil receiving unit 3. The surface / bulk composite dielectric barrier discharge plasma unit 2 is wavy in shape. An ultrasonic oscillator is provided on the surface / bulk composite dielectric barrier discharge plasma unit 2 to disperse the soil on the surface / bulk composite dielectric barrier discharge plasma unit 2 and prevent soil deposition during the remediation process. When using this dielectric barrier discharge system to treat contaminated soil, the contaminated soil must meet certain dryness and coarseness requirements. Contaminated soil that meets these requirements is placed in the soil storage unit 1. The bottom of the soil storage unit 1 is funnel-shaped, facilitating uniform soil flow into the surface / bulk composite dielectric barrier discharge plasma unit 2 without excessive compression. The outlet of the soil storage unit 1 is closely connected to the inlet of the surface / bulk composite dielectric barrier discharge plasma unit 2, and the width is constant, which also determines the consistent thickness of the soil during remediation.

[0046] like Figure 9 In this embodiment, the surface / volume composite dielectric barrier discharge plasma unit 2 includes: a third strip-shaped high-voltage electrode 231, a strip-shaped grounding electrode 232, and an insulating channel 233. The insulating channel 233 is wavy, with the upper opening of the insulating channel 233 fixedly connected to the funnel-shaped opening of the soil storage unit 1, and the lower opening of the insulating channel 233 fixedly connected to the upper opening of the soil receiving unit 3. The third strip-shaped high-voltage electrodes 231 are evenly spaced on one side of the insulating channel 233 with the same fold direction, and the strip-shaped grounding electrodes 232 are evenly spaced on the other side. After changing the fold direction of the insulating channel 233, the layout positions of the third strip-shaped high-voltage electrodes 231 and the strip-shaped grounding electrodes 232 are swapped. The high-voltage electrodes are powered by a high-voltage power supply and can increase the soil repair time in the surface / volume composite dielectric barrier discharge plasma unit 2 within a certain space. The third strip-shaped high-voltage electrode 231 and the strip-shaped grounding electrode 232 flip at different fold directions, which can drive the soil to move laterally, thereby achieving more uniform soil treatment and more significant repair effect.

[0047] Because soil has a certain moisture content, an ultrasonic oscillator is installed on the sidewall of the insulating channel 233 to prevent soil accumulation along the surface / bulk composite dielectric barrier discharge plasma unit 2. Ultrasonic oscillators are used to prevent soil deposition through ultrasonic oscillation. Furthermore, when soil purification is performed, the frequency and power of the high-voltage power supply are adjusted to increase the spectral intensity of hydroxyl radicals and oxygen ions. When soil nitrogen fixation is performed, the frequency and power of the high-voltage power supply are adjusted to increase the spectral intensity of nitrogen oxides. A humidity sensor monitors the gas humidity along the surface / bulk composite dielectric barrier discharge plasma unit 2 in real time. If the gas humidity does not meet the set standard, the flow rate of the external gas source is adjusted until the gas humidity reaches the set standard, thereby ensuring that the discharge reaction zone along the surface / bulk composite dielectric barrier discharge plasma unit 2 is in the optimal state for treating pollutants.

[0048] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the principles of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A dielectric barrier discharge system for soil purification or fertilization, characterized in that: include: A soil storage unit (1), a surface / body composite dielectric barrier discharge plasma unit (2), a soil receiving unit (3), a high-voltage power supply, and a feedback regulation unit. The soil storage unit (1) is used to store contaminated soil, and transmit the contaminated soil to the surface / body composite dielectric barrier discharge plasma unit (2) for discharge repair, and transmit the repaired soil to the soil receiving unit (3); the high-voltage power supply provides power to the surface / body composite dielectric barrier discharge plasma unit (2); the feedback regulation unit is arranged on the surface / body composite dielectric barrier discharge plasma unit (2), and the feedback regulation unit is used to monitor the discharge process of the surface / body composite dielectric barrier discharge plasma unit (2); The surface / body composite dielectric barrier discharge plasma unit (2) comprises: an upper insulating glass (211), a lower insulating glass (212), a first strip-shaped high-voltage electrode (213) and a first insulating layer (214), wherein the first strip-shaped high-voltage electrode (213) and the first insulating layer (214) are alternately arranged to form a high-voltage electrode, wherein the upper end of the high-voltage electrode is connected to the lower end of the opening of the soil storage unit (1), and the lower end of the high-voltage electrode is connected to the lower end of the opening of the soil receiving unit (3); the upper insulating glass (211) is arranged above the high-voltage electrode, and the two ends of the upper insulating glass (211) are respectively fixedly connected to the soil storage unit (1) and the soil receiving unit (3); the lower insulating glass (212) is arranged below the high-voltage electrode, and the two ends of the lower insulating glass (212) are respectively fixedly connected to the soil storage unit (1) and the soil receiving unit (3); the upper surface of the upper insulating glass (211) and the lower surface of the lower insulating glass (212) are both grounded; and an ultrasonic oscillator is provided on the lower side of the high-voltage electrode; The feedback adjustment unit comprises: a humidity sensor and four ultraviolet sensors, wherein the spectral intensities of hydroxyl radicals, oxygen ions, nitrogen oxides and nitrogen are collected respectively by the four ultraviolet sensors. When soil purification is performed, the power supply frequency and power of the high-voltage power supply are adjusted to increase the spectral intensities of hydroxyl radicals and oxygen ions; when soil nitrogen fixation is performed, the power supply frequency and power of the high-voltage power supply are adjusted to increase the spectral intensity of nitrogen oxides; the humidity sensor is used to monitor the gas humidity of the surface / body composite dielectric barrier discharge plasma unit (2) in real time. If the gas humidity does not reach the set standard, the flow rate of the external gas source is adjusted until the gas humidity reaches the set standard.

2. A dielectric barrier discharge system for soil purification or fertilization according to claim 1, characterized in that: An opening is provided at the lower side of the soil storage unit (1), and the opening of the soil storage unit (1) is connected to the surface / body composite dielectric barrier discharge plasma unit (2); an opening is provided at the upper side of the soil receiving unit (3), and the opening of the soil receiving unit (3) is connected to the surface / body composite dielectric barrier discharge plasma unit (2); an ultrasonic oscillator is provided on the surface / body composite dielectric barrier discharge plasma unit (2) for dispersing soil on the surface / body composite dielectric barrier discharge plasma unit (2).

3. The dielectric barrier discharge system for soil purification or fertilization according to claim 2, characterized in that: The inclination angle of the surface / body composite dielectric barrier discharge plasma unit (2) is 5°-45°.

4. A dielectric barrier discharge system for soil purification or fertilization, characterized in that: include: A soil storage unit (1), a surface / body composite dielectric barrier discharge plasma unit (2), a soil receiving unit (3), a high-voltage power supply, and a feedback regulation unit. The soil storage unit (1) is used to store contaminated soil, and transmit the contaminated soil to the surface / body composite dielectric barrier discharge plasma unit (2) for discharge repair, and transmit the repaired soil to the soil receiving unit (3); the high-voltage power supply provides power to the surface / body composite dielectric barrier discharge plasma unit (2); the feedback regulation unit is arranged on the surface / body composite dielectric barrier discharge plasma unit (2), and the feedback regulation unit is used to monitor the discharge process of the surface / body composite dielectric barrier discharge plasma unit (2); The surface / body composite dielectric barrier discharge plasma unit (2) comprises: a ground electrode (221), a second insulating layer (222), a second strip-shaped high-voltage electrode (223), a metal pulley (224), a motor and a fixed frame, wherein the two metal pulleys (224) are arranged horizontally, and the ground electrode (221) is sleeved on the metal pulley (224); the metal pulley (224) located on one side of the soil storage unit (1) is connected to the rotating shaft of the motor, and the axis of the metal pulley (224) located on one side of the soil storage unit (1) is connected to the fixed frame; the second insulating layer (222) and the second strip-shaped high-voltage electrode (223) are alternately connected to form a high-voltage electrode, the high-voltage electrode is arranged above the ground electrode (221), one end of the high-voltage electrode is fixedly connected to the upper end surface of the soil receiving unit (3), and the other end of the high-voltage electrode is fixedly connected to the soil storage unit (1); The feedback adjustment unit comprises: a humidity sensor and four ultraviolet sensors, wherein the spectral intensities of hydroxyl radicals, oxygen ions, nitrogen oxides and nitrogen are collected respectively by the four ultraviolet sensors. When soil purification is performed, the power supply frequency and power of the high-voltage power supply are adjusted to increase the spectral intensities of hydroxyl radicals and oxygen ions; when soil nitrogen fixation is performed, the power supply frequency and power of the high-voltage power supply are adjusted to increase the spectral intensity of nitrogen oxides; the humidity sensor is used to monitor the gas humidity of the surface / body composite dielectric barrier discharge plasma unit (2) in real time. If the gas humidity does not reach the set standard, the flow rate of the external gas source is adjusted until the gas humidity reaches the set standard.

5. The dielectric barrier discharge system for soil purification or fertilization according to claim 4, characterized in that: A support plate (4) is provided below the soil storage unit (1), a funnel-shaped opening is provided below the soil storage unit (1), one end of the surface / body composite dielectric barrier discharge plasma unit (2) is located below the funnel-shaped opening, and the other end of the surface / body composite dielectric barrier discharge plasma unit (2) extends into the opening of the soil receiving unit (3); the surface / body composite dielectric barrier discharge plasma unit (2) is arranged horizontally, and uses a conveyor belt to convey the repaired soil to the soil receiving unit (3).

6. A dielectric barrier discharge system for soil purification or fertilization, characterized in that: include: A soil storage unit (1), a surface / body composite dielectric barrier discharge plasma unit (2), a soil receiving unit (3), a high-voltage power supply, and a feedback regulation unit. The soil storage unit (1) is used to store contaminated soil, and transmit the contaminated soil to the surface / body composite dielectric barrier discharge plasma unit (2) for discharge repair, and transmit the repaired soil to the soil receiving unit (3); the high-voltage power supply provides power to the surface / body composite dielectric barrier discharge plasma unit (2); the feedback regulation unit is arranged on the surface / body composite dielectric barrier discharge plasma unit (2), and the feedback regulation unit is used to monitor the discharge process of the surface / body composite dielectric barrier discharge plasma unit (2); The surface / body composite dielectric barrier discharge plasma unit (2) comprises: a third strip high-voltage electrode (231), a strip grounding electrode (232) and an insulating channel (233); the insulating channel (233) is wavy, the upper end opening of the insulating channel (233) is fixedly connected to the funnel-shaped opening of the soil storage unit (1), and the lower end opening of the insulating channel (233) is fixedly connected to the upper end opening of the soil receiving unit (3); the third strip high-voltage electrode (231) is arranged at equal intervals on one side of the insulating channel (233) with the same folding direction, and the strip grounding electrode (232) is arranged at equal intervals on the other side; after changing the folding direction of the insulating channel (233), the arrangement positions of the third strip high-voltage electrode (231) and the strip grounding electrode (232) are exchanged; and an ultrasonic oscillator is provided on the side wall of the insulating channel (233); The feedback adjustment unit comprises: a humidity sensor and four ultraviolet sensors, wherein the spectral intensities of hydroxyl radicals, oxygen ions, nitrogen oxides and nitrogen are collected respectively by the four ultraviolet sensors. When soil purification is performed, the power supply frequency and power of the high-voltage power supply are adjusted to increase the spectral intensities of hydroxyl radicals and oxygen ions; when soil nitrogen fixation is performed, the power supply frequency and power of the high-voltage power supply are adjusted to increase the spectral intensity of nitrogen oxides; the humidity sensor is used to monitor the gas humidity of the surface / body composite dielectric barrier discharge plasma unit (2) in real time. If the gas humidity does not reach the set standard, the flow rate of the external gas source is adjusted until the gas humidity reaches the set standard.

7. The dielectric barrier discharge system for soil purification or fertilization according to claim 6, characterized in that: A funnel-shaped opening is provided below the soil storage unit (1), the funnel-shaped opening is fixedly connected to the upper end of the surface / body composite dielectric barrier discharge plasma unit (2), and the lower end of the surface / body composite dielectric barrier discharge plasma unit (2) is fixedly connected to the upper end opening of the soil receiving unit (3); the surface / body composite dielectric barrier discharge plasma unit (2) is wavy; and an ultrasonic oscillator is provided on the surface / body composite dielectric barrier discharge plasma unit (2) for dispersing soil on the surface / body composite dielectric barrier discharge plasma unit (2).

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