Plasma enhanced organic matter and heavy metal contaminated soil remediation device and method thereof

Abstract

The application patent belongs to the technical field of soil environment remediation, and particularly relates to a plasma-enhanced organic matter and heavy metal contaminated soil remediation device and method. The first cylinder and the second cylinder are coaxially arranged, and the second cylinder is sleeved outside the first cylinder. The upper cover plate is arranged at the top end of the first cylinder and the second cylinder, and the lower cover plate is arranged at the bottom end of the first cylinder and the second cylinder. The first cylinder, the second cylinder, the upper cover plate and the lower cover plate form a closed cavity, and a cylindrical metal mesh is arranged in the closed cavity. The upper cover plate is provided with a feeding pipe and a second air inlet pipe which are in communication with the inner cavity of the first cylinder, and a first air inlet pipe which is in communication with the closed cavity. The side wall of the second cylinder is provided with a first air outlet pipe. The lower cover plate is provided with a second air outlet pipe and a discharge port which are in communication with the inner cavity of the first cylinder. The application can realize in-situ online continuous integrated detection of the concentration of pollutants, has high operability, high energy utilization rate, and good remediation effect on organic matter and heavy metal contaminated soil.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of soil environment remediation, and particularly relates to a plasma-enhanced organic matter and heavy metal contaminated soil remediation device and method. BACKGROUND

[0002] Soil is an indispensable part of the environment and is crucial to human survival. In recent years, with the accelerated pace of urbanization and industrialization, soil pollution problems have become increasingly prominent and diversified. In China, there are many types of soil pollutants, with high concentrations of pollutants, coexistence of heavy metals and organic matter, deep contaminated soil, and high difficulty in remediation. Moreover, pollutants have a lagging effect, causing great harm to human health and the ecological environment.

[0003] At present, a series of remediation technologies have been developed for various types of soil organic matter and heavy metal pollution problems at home and abroad, mainly including gas phase extraction technology, leaching technology, electrokinetic remediation technology, chemical oxidation technology, solidification / stabilization technology, thermal desorption technology, and cement kiln co-processing technology. These technologies show good removal effect for organic matter / heavy metals, but the applicable conditions are different for different target pollutants (especially difficult-to-degrade and highly toxic chlorinated organic matter and heavy metals). There are risks of low removal efficiency, pollutant range diffusion, and secondary pollution. The combined use of multiple technologies to remediate organic matter / heavy metal contaminated soil is a good strategy. With the development of technology, new low-temperature plasma technology has made great progress in treating environmental pollutants (VOCs / SO2 / NOx / odor / dioxin / POPs, etc.), and there have been many engineering cases in waste gas and organic wastewater treatment, showing broad application prospects. However, this technology is still in the laboratory pilot stage for soil organic matter and heavy metal treatment, and there are problems such as high power consumption, low energy utilization rate, and lack of innovative treatment equipment. According to different discharge forms, discharge plasma technology is divided into high-voltage pulse discharge, sliding arc discharge, dielectric barrier discharge, and glow discharge. Among them, the dielectric barrier discharge (DBD) has a relatively simple structure, can discharge at normal temperature and pressure, produces a large number of highly chemically active particles (·OH, ·H, ·O, O3, H3O+, etc.), and is accompanied by high temperature, ultraviolet radiation, and other physical effects. It is stable in operation and has considerable energy efficiency. It is the most studied discharge method in the field of soil pollution remediation.

[0004] Compared with the currently disclosed patent documents, most of the plasma devices are designed in the form of a fluidized bed, and high-voltage discharge adopts a jet discharge mode. Although they are used alone or in combination with other technologies, they achieve good results in removing organic matter / heavy metals, but there are still problems such as low treatment capacity, low comprehensive utilization rate of active species and energy produced by discharge, low pollutant removal efficiency, complex structure, and poor operability, which still need to be improved. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a plasma-enhanced organic matter heavy metal contaminated soil remediation device, which has the advantages of simple structure, stable operation, high operability, high energy comprehensive utilization rate, and good organic matter heavy metal contaminated soil remediation effect.

[0006] To solve the above technical problems, the present application provides a plasma-enhanced organic matter heavy metal contaminated soil remediation device and method, which comprises a first cylinder, a second cylinder, an upper cover plate and a lower cover plate, a high-voltage electrode and a grounding electrode, the first cylinder and the second cylinder are coaxially arranged, and the second cylinder is sleeved outside the first cylinder; the upper cover plate is arranged at the top end of the first cylinder and the second cylinder, and the lower cover plate is arranged at the bottom end of the first cylinder and the second cylinder; a closed cavity is formed between the first cylinder, the second cylinder, the upper cover plate and the lower cover plate, and a cylindrical metal mesh is arranged in the closed cavity; the upper cover plate is provided with a feeding pipe and a second air inlet pipe which are in communication with the inner cavity of the first cylinder, and a first air inlet pipe which is in communication with the closed cavity; the side wall of the second cylinder is provided with a first air outlet pipe, the first air outlet pipe is in communication with the second air inlet pipe through a first pipeline; the lower cover plate is provided with a second air outlet pipe and a discharge port which are in communication with the inner cavity of the first cylinder.

[0007] The medium gas source of the first air inlet pipe is one of air, oxygen, argon and nitrogen.

[0008] The first air outlet pipe is in communication with the second air inlet pipe through the first pipeline, which enhances the degree of gas dissociation.

[0009] The stirrer is located in the second cylinder and is made of 304 or 316 stainless steel with a polytetrafluoroethylene coating on the surface.

[0010] The distance between the bottom end of the stirrer and the lower cover plate is 10-30mm, which can be adjusted according to the actual size of the cylinder.

[0011] The driving motor is fixedly connected with the support plate, the support plate is fixedly connected with the upper cover plate and located above the upper cover plate, and the feeding pipe, the first air inlet pipe and the second air inlet pipe all pass through the support plate.

[0012] The upper cover plate is also provided with a flushing pipe with a check valve which is in communication with the inner cavity of the first cylinder.

[0013] The first cylinder is made of polytetrafluoroethylene material, and the outer wall is wrapped with insulating and heat insulating material, and the second cylinder is made of polytetrafluoroethylene material, and the inner wall is coated with a titanium dioxide film.

[0014] The upper cover plate and the lower cover plate are both made of 304 or 316 stainless steel, and the upper and lower cover plates are sealed from the first cylinder and the second cylinder by a quartz glass circular gasket.

[0015] The first cylinder and the second cylinder are both cylindrical bodies, and the thickness of the cylinder wall is 5-10 mm.

[0016] The high-voltage electrode is connected with a high-voltage power supply, the input voltage is 220V, the output voltage is 0-20kV, the current is 0-10A, and the plasma discharge mode is dielectric barrier discharge.

[0017] The method for removing heavy metals from organic matter by plasma strengthening comprises the following steps: firstly, the contaminated soil to be repaired (or the uniformly mixed soil-agent after pretreatment) is injected into the first cylinder through the feeding pipe, the carrier gas is introduced into the closed cavity from the first gas inlet pipe, the driving motor and the high-voltage electrode power supply are started, the gas molecules are fully ionized, a large number of active particles are generated, and the active particles are fully contacted with the contaminated soil under the action of the stirrer to improve the mass transfer of the active particles; secondly, the heat, radiation wave and ultraviolet generated in the discharge process act on the titanium dioxide and the agent to generate more active particles, and the pollutants in the soil are degraded and removed through a series of reactions; finally, the second gas outlet pipe is connected with a gas / liquid mass spectrometer, an electron paramagnetic resonance instrument and an inductively coupled plasma emission spectrometer (if there is residual gas / liquid in the first cylinder, the second gas outlet pipe can be connected with a waste gas / wastewater treatment device), the concentration of the organic matter and heavy metals in the contaminated soil is accurately mastered through the setting of interval sampling time (offline) or real-time online monitoring, the repair time of a single batch of contaminated soil is determined, the next batch of contaminated soil is injected into the first cylinder through the feeding port, and batch processing is realized.

[0018] Compared with the prior art, the device and method for repairing contaminated soil of organic matter and heavy metals by plasma strengthening have the following beneficial effects:

[0019] The gas entering the closed cavity between the first cylinder and the second cylinder through the first gas inlet pipe is ionized by high-voltage discharge to generate a large number of active particles, which enter the second cylinder through the first pipeline from the second gas inlet pipe, compared with the gas directly entering the second cylinder, the degree of ionization of the gas is sufficiently enhanced, more active particles are contacted with the pollutants in the soil, and the utilization rate of active species and the removal efficiency of pollutants are improved.

[0020] The motor drives the stirrer to disturb the soil, so that the active particles diffuse from the soil surface to the soil particle pores, and the mass transfer effect of the active substances is significantly improved.

[0021] The high-voltage discharge process generates a certain amount of heat, which can reduce the water content of the soil itself, avoid the adhesion of soil particles to the wall surface of the second cylinder and the stirrer, and improve the working efficiency of the equipment. On the other hand, the temperature of the second cylinder and the metal mesh in the cavity can increase the activation effect of the oxidizing agent (such as persulfate) used in the current organic matter degradation process, and also provides the possibility of thermal desorption for the remediation of organic contaminated soil.

[0022] The outer wall of the first cylinder is wrapped with thermal insulation material, which can effectively reduce the heat loss in the system and improve the heat utilization rate. The inner wall of the second cylinder is coated with a thin film of titanium dioxide. The ultraviolet light generated during the high-voltage discharge process excites the titanium dioxide to produce strong oxidative photogenerated holes, thereby improving the degradation / removal efficiency of pollutants.

[0023] The cleaning pipe not only can clean the equipment by injecting water, but also can inject chemical agents to cooperate with the low-temperature plasma technology to achieve the effect of enhancing the degradation / removal of pollutants.

[0024] The second gas outlet is connected to a gas / liquid mass spectrometer, an electron paramagnetic resonance instrument and an inductively coupled plasma emission spectrometer. By setting a sampling interval (offline) or real-time online monitoring, the concentration of organic matter and heavy metals in the contaminated soil can be accurately mastered, so as to determine the remediation time of a single batch of contaminated soil, and on this basis, the next batch of contaminated soil is injected through the injection port, realizing batch processing and improving the comprehensive utilization efficiency of the device and energy.

[0025] The plasma-enhanced organic matter and heavy metal contaminated soil remediation device releases active particles such as ·OH, ·O, O3 and other strong oxidizing substances, which can oxidize organic pollutants and heavy metals (such as As(III)), and convert them into low-toxic or non-toxic substances; ·H and H3O+ and other strong reducing substances can reduce difficult-to-degrade chlorinated organic matter (organochlorine pesticides, POPs, PCBs, etc.) or high-valence high-toxicity heavy metals (such as chromium) into low-valence non-toxic substances. Thus, efficient removal of organic matter and heavy metals is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a front view of the plasma-enhanced organic matter and heavy metal contaminated soil remediation device of the present application;

[0027] Figure 2 It is a top view of the plasma-enhanced organic matter and heavy metal contaminated soil remediation device of the present application.

[0028] In the figure: driving motor 1, feed pipe 2, first air inlet pipe 3, flushing pipe 4, support plate 5, high voltage electrode 6, grounding electrode 7, agitator 8, first cylinder 9, titanium dioxide film 10, second cylinder 11, metal mesh 12, first air outlet pipe 13, second air inlet pipe 14, discharge port 15, second air outlet pipe 16, lower cover plate 17, stainless steel flange 18, first pipeline 19, upper cover plate 20. DETAILED DESCRIPTION

[0029] The application will be described in further detail below with reference to the drawings and specific embodiments. The described embodiments are merely a part of the embodiments of the application, and are not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0030] In the description of the application, it should be further explained that the terms "upper", "lower" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, it should be further explained that unless otherwise explicitly specified and limited, the term "communication" should be understood broadly, which can be fixedly connected, or detachably connected, or integrally connected, which can be mechanically connected, or welded, which can be directly connected, or indirectly connected through an intermediate medium, which can be the connection between two elements inside. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0031] The embodiment of the application provides a kind of plasma enhanced organic heavy metal contaminated soil remediation device and method, such as Figure 1 And Figure 2As shown, it comprises a first cylinder 9, a second cylinder 11, an upper cover plate 20 and a lower cover plate 17, a high voltage electrode 6 and a grounding electrode 7. The first cylinder 9 and the second cylinder 11 are coaxially arranged, and the second cylinder 11 is sleeved outside the first cylinder 9. The upper cover plate 20 is arranged at the top end of the first cylinder 9 and the second cylinder 11, and the lower cover plate 17 is arranged at the bottom end of the first cylinder 9 and the second cylinder 11. A closed cavity is formed between the first cylinder 9, the second cylinder 11, the upper cover plate 20 and the lower cover plate 17, and the closed cavity is uniformly provided with a metal mesh 12. The upper cover plate 20 is provided with a feeding pipe 2 and a second air inlet pipe 14 which are in communication with the inner cavity of the first cylinder 9, and a first air inlet pipe 3 which is in communication with the closed cavity. The side wall of the second cylinder 11 is provided with a first air outlet pipe 13 which is in communication with the second air inlet pipe 14 through a first pipeline 19. The lower cover plate 17 is provided with a second air outlet pipe 16 and a discharge port 15 which are in communication with the inner cavity of the second cylinder 11. Preferably, the first cylinder 9 and the second cylinder 11 are both made of polytetrafluoroethylene material, and the upper cover plate 20 and the lower cover plate 17 are both made of stainless steel. A quartz glass circular sealing gasket is arranged between the upper cover plate 20 and the top end of the first cylinder 9 and the second cylinder 11, and a quartz glass circular sealing gasket is arranged between the lower cover plate 17 and the bottom end of the first cylinder 9 and the second cylinder 11, which can be used as an insulating medium baffle. Preferably, the first cylinder 9 and the second cylinder 11 are both cylindrical. The lower cover plate 17 is fixedly connected with a stainless steel flange 18 below.

[0032] In the above embodiment, the organic matter / heavy metal contaminated soil to be repaired and the reagent (such as transition metal-based catalytic material, biochar, activated carbon, persulfate, hydroxyapatite, quicklime, etc.) are introduced into the first cylinder 9 through the feeding pipe 2, and the carrier gas for plasma discharge ionization to generate active particles is introduced into the first cylinder 9 through the first air inlet pipe 3. The carrier gas enters the closed cavity between the first cylinder 9 and the second cylinder 11, a large number of active particles are generated, and the carrier gas enters the first cylinder 9 from the second air inlet pipe 14 through the first pipeline 19. The gas molecules that are not completely ionized are further strengthened in the first cylinder 9 to generate more active particles, which can fully contact the pollutants in the soil pores with the help of the stirrer 8, thereby enhancing the degradation / removal efficiency of the pollutants. At the same time, the plasma discharge process generates heat, which increases the temperature of the first cylinder 9 and the metal mesh 12, which is beneficial to the activation and decomposition of the oxidant (such as persulfate) to generate free radicals to degrade organic pollutants, and also provides the possibility for ex-situ thermal desorption repair of organic contaminated soil. The repair device of the present embodiment has the advantages of simple structure, high comprehensive utilization rate of active particles and energy, and good repair effect of contaminated soil.

[0033] Preferably, the inner wall of the first cylinder 9 is coated with a titanium dioxide film 10.

[0034] In the preferred embodiment, the ultraviolet light generated by the plasma discharge excites the titanium dioxide film 10 to generate strong oxidizing photo-generated holes, and enhances the mass transfer of active particles in the soil, significantly improving the degradation efficiency of organic pollutants.

[0035] Preferably, the first gas outlet pipe 13 is in communication with the second gas inlet pipe 14 through a first pipe. The gas molecules entering from the first gas inlet pipe 3 first enter the closed cavity between the first cylinder and the second cylinder, rapidly dissociate, enter the first cylinder through the first pipe, and enhance the degree of dissociation of the gas, fully ionize the gas molecules to generate more active particles, and enhance the removal efficiency of pollutants.

[0036] Preferably, the repair device of the embodiment further comprises a driving motor 1 and a stirrer 8, the driving motor 1 is connected with the stirrer 8, and the stirrer 8 is located in the first cylinder 9 and is made of 304 or 316 stainless steel and coated with polytetrafluoroethylene on the outer layer. During use, the driving motor 1 drives the stirrer 8 to operate, stirs the contaminated soil in the first cylinder 9, increases the contact area between the active particles and the pores of the contaminated soil particles, and improves the mass transfer efficiency and the removal efficiency of pollutants.

[0037] Preferably, the distance between the bottom end of the stirrer 8 and the lower cover plate 17 is 10-30 mm (which can be adjusted according to the actual size of the cylinder). The distance between the bottom end of the stirrer 8 and the lower cover plate 17 is set in the above range, which ensures that the stirrer 8 can stir the contaminated soil at the bottom of the first cylinder 9 while avoiding touching the lower cover plate 17, and also facilitates the later disassembly and cleaning.

[0038] Preferably, the repair device of the embodiment further comprises a support plate 5, the driving motor 1 is fixedly connected with the support plate 5, the support plate 5 is fixedly connected with the upper cover plate 20 and located above the upper cover plate 20. The feeding pipe 2, the first gas inlet pipe 3 and the second gas inlet pipe 14 all pass through the support plate 5.

[0039] Preferably, the upper cover plate 20 is further provided with a flushing pipe 4 in communication with the inner cavity of the first cylinder 9. The flushing pipe 4 is provided to flush the inner wall of the first cylinder 9 and the stirrer 8 with liquid after the repair is completed, and also to add reagents through the flushing pipe 4 to cooperate with the plasma technology to achieve efficient removal of refractory and highly toxic chlorine-containing organic matter / heavy metals.

[0040] As a further description of the above embodiment, the principle of the plasma-enhanced organic matter and heavy metal degradation / removal of the present application is as follows: a large number of high-energy electrons generated by plasma discharge bombard gas molecules to ionize a large number of active particles (such as ·OH, ·O, O3, ·H and H3O+), heat, radiation waves and ultraviolet light, etc. physical and chemical effects, which cooperate with TiO2 and reagents to act on pollutants to achieve efficient and complete removal of pollutants. The effects of plasma discharge on organic pollutants and heavy metals (As3+, Cr6+) may occur in the cylinder as follows:

[0041] [·OH / ·O / O3] + organic pollutants → CO2 + H2O + small molecule compounds

[0042] [·OH / ·O / O3]+As(III)→As(V)

[0043] 3·H+Cr(VI)→Cr(III)+3H+

[0044] The operation of the repair device in the above preferred embodiment is as follows:

[0045] First, the organic and heavy metal contaminated soil to be remediated (or a pre-treated and uniformly mixed soil-remediation mixture) is injected into the first cylinder 9 through the feed pipe 2. Carrier gas is introduced into the sealed cavity through the first air inlet pipe 3. Then, the drive motor 1 and the high-voltage electrode 6 are powered on, and plasma sparks are rapidly formed between the electrodes in the carrier gas atmosphere. This sparks the gas molecules, causing them to ionize and transform into a large number of active particles. The active particles flow from the first air outlet pipe 13 through the first pipe 19 and enter the first cylinder 9 through the second air inlet pipe 14. Under the stirring action of the stirrer 8, they come into full contact with the contaminated soil. Simultaneously, the inner wall of the first cylinder 9 is coated with a titanium dioxide film 10. The ultraviolet light generated during the discharge process excites the titanium dioxide to produce photogenerated holes and free electrons. The photogenerated holes have strong oxidizing properties and work together with the active particles to degrade / remove the soil pollutants through a series of reactions, thereby achieving the purpose of soil remediation. The remediated soil flows out through the discharge port 15 for physicochemical property evaluation. After the soil treatment process is completed, liquid is introduced into the first cylinder 9 through the cleaning pipe 4 to clean the internal components of the first cylinder 9. Residual gas / liquid in the first cylinder 9 is discharged through the second vent pipe 16, connected to an external waste gas / wastewater treatment device. To monitor the concentration of pollutants within the device, the second vent pipe 16 can be connected to a gas chromatography / liquid chromatography-mass spectrometry (GC / MS), an electron paramagnetic resonance (EPR) spectrometer, and an inductively coupled plasma atomic emission spectrometer (ICP-AES). By setting interval sampling times (offline) or real-time online monitoring, the concentration of organic matter and heavy metals in the contaminated soil can be accurately determined. This allows for the determination of the remediation time for a single batch of contaminated soil, and the next batch of contaminated soil can be injected through the injection port to achieve batch-by-batch treatment.

[0046] This invention is not limited to the details of the above exemplary embodiments. For those skilled in the art, this invention can have various modifications and variations. Moreover, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit or basic characteristics of this invention should be included within the scope of protection of this invention.

Claims

1. A device for remediation of heavy metal contaminated soil by plasma enhanced organic matter, characterized in that, It includes first cylinder (9), second cylinder (11), upper cover plate (20), lower cover plate (17), high voltage electrode (6) and ground electrode (7), the first cylinder (9) and second cylinder (11) are coaxially arranged, and the second cylinder (11) is sleeved on the outside of the first cylinder (9);The upper cover plate (20) is arranged at the top end of the first cylinder (9) and the second cylinder (11), and the lower cover plate (17) is arranged at the bottom end of the first cylinder (9) and the second cylinder (11);The first cylinder (9), the second cylinder (11), the upper cover plate (20) and the lower cover plate (17) form a closed cavity, and a cylindrical metal mesh (12) is arranged in the closed cavity;The upper cover plate (20) is provided with a feed pipe (2) and a second air inlet pipe (14) communicated with the inner cavity of the first cylinder (9) and a first air inlet pipe (3) communicated with the closed cavity;The side wall of the second cylinder (11) is provided with a first air outlet pipe (13), and the first air outlet pipe (13) is communicated with the second air inlet pipe (14) through a first pipeline (19);The lower cover plate (17) is provided with a second air outlet pipe (16) and a discharge port (15) communicated with the inner cavity of the first cylinder (9).

2. The plasma-enhanced organic matter and heavy metal contaminated soil remediation device according to claim 1, characterized in that, The medium gas source of the first air inlet pipe (3) is one of air, oxygen, argon and nitrogen.

3. The plasma-enhanced organic matter and heavy metal contaminated soil remediation device of claim 1, wherein, It further includes a driving motor (1) and a stirrer (8), the driving motor (1) is connected with the stirrer (8), and the stirrer (8) is located in the first cylinder (9) and is made of 304 or 316 stainless steel and has a polytetrafluoroethylene coating on the surface.

4. The plasma-enhanced organic matter and heavy metal contaminated soil remediation device of claim 3, wherein, The distance between the bottom end of the stirrer (8) and the lower cover plate (17) is 10-30 mm.

5. The plasma-enhanced organic matter and heavy metal contaminated soil remediation device of claim 3, wherein, It further includes a support plate (5), the driving motor (1) is fixedly connected with the support plate (5), the support plate (5) is fixedly connected with the upper cover plate (20) and located above the upper cover plate (20), and the feed pipe (2), the first air inlet pipe (3) and the second air inlet pipe (14) all pass through the support plate (5).

6. The plasma-enhanced organic matter and heavy metal contaminated soil remediation device of claim 1, wherein, The upper cover plate (20) is further provided with a flushing pipe (4) with a check valve communicated with the inner cavity of the first cylinder (9).

7. The plasma-enhanced organic matter and heavy metal contaminated soil remediation device of claim 3, wherein, The first cylinder (9) is made of polytetrafluoroethylene and has a titanium dioxide film (10) coated on the inner wall, and the second cylinder (11) is made of polytetrafluoroethylene and has an insulating and heat insulating material wrapped on the outer wall.

8. The plasma-enhanced organic matter and heavy metal contaminated soil remediation device of claim 1, wherein, The upper cover plate (20) and the lower cover plate (17) are both made of 304 or 316 stainless steel, and the upper and lower cover plates are sealed from the first cylinder (9) and the second cylinder (11) by a quartz glass circular gasket.

9. The plasma-enhanced organic matter and heavy metal contaminated soil remediation device of claim 1, wherein, The first cylinder (9) and the second cylinder (11) are both cylindrical bodies, and the wall thickness of the cylinder is 5-10 mm.

10. The plasma-enhanced organic matter and heavy metal contaminated soil remediation device of claim 1, wherein, The high voltage electrode (6) is connected with a high voltage power supply, the input voltage is 220V, the output voltage is 0-20kV, the current is 0-10A, and the plasma discharge mode is dielectric barrier discharge.

11. A method for repairing heavy metal contaminated soil of organic matter by using the device according to claim 7. Firstly, the organic or heavy metal contaminated soil to be repaired, or the pretreated mixed soil-agent is injected into the first cylinder (9) from the feeding pipe (2), the carrier gas is introduced into the closed cavity from the first air inlet pipe (3), the driving motor (1) and the high-voltage electrode (6) power supply are started, the gas molecules are fully ionized, and a large number of active particles are converted, which are fully contacted with the contaminated soil under the action of the stirrer (8), and the mass transfer of the active particles is improved; Secondly, the heat, radiation wave and ultraviolet generated in the discharge process act on the titanium dioxide and the agent, more active particles are generated, and the pollutants in the soil are degraded or removed through a series of reactions; Finally, the second air outlet pipe (16) is connected with the gas or liquid mass spectrometer, the electron paramagnetic resonance instrument and the inductively coupled plasma emission spectrometer, the concentration of the organic or heavy metal in the contaminated soil is accurately mastered through the setting of interval sampling time or real-time online monitoring, the repair time of a single batch of contaminated soil is determined, the next batch of contaminated soil is injected through the feeding port, and the batch processing is realized.

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