Device and method for repairing petroleum hydrocarbon contaminated soil through combination of chemical oxidation and microorganisms

Abstract

The invention belongs to the technical field of petroleum hydrocarbon contaminated soil remediation, and discloses a device and method for remediation of petroleum hydrocarbon contaminated soil through chemical oxidation and microorganisms, the device comprises a soil treatment chamber, a soil adding opening is formed in the top of the soil treatment chamber, and a stirring device is arranged at the bottom in the soil treatment chamber; a chemical agent spraying system and a microorganism supply system are arranged at the position, close to the top, in the soil treatment chamber, the chemical agent spraying system is used for spraying chemical agents into the soil treatment chamber, and the microorganism supply system is used for supplying microorganisms into the soil treatment chamber. The invention aims to solve the limitation of a single remediation technology and meet the requirements of contaminated soil remediation.

Description

Technical Field

[0001] The present invention belongs to the technical field of remediation of petroleum hydrocarbon contaminated soil, and particularly relates to a device and method for chemically oxidizing and microbially remediating petroleum hydrocarbon contaminated soil. Background Art

[0002] In recent years, due to the continuous acceleration of the industrialization process, the demand for crude oil has also increased sharply. Petroleum hydrocarbon contaminated soil is one of the main pollutants generated during the development and production of oil fields, such as in drilling, fracturing, well testing, operation, crude oil treatment, crude oil storage and transportation, etc. The soil contaminated with petroleum hydrocarbons is composed of water, crude oil and solid particles, and contains a large number of organic compounds. These compounds are harmful to the environment and may have adverse effects on the health and ecology of the surrounding areas. Therefore, it is necessary to treat the petroleum hydrocarbon contaminated soil to reduce its negative impact on the environment.

[0003] Currently, physical methods, chemical methods and microbial methods are the main methods for remediating petroleum hydrocarbon contaminated soil. Physical remediation methods are difficult to promote in practical applications due to high costs, large amounts of energy and resources required. When microbial remediation is applied to actual contaminated sites, there are often problems such as long remediation cycles, low remediation efficiency and poor site adaptability. The toxic effect of high-concentration organic pollutants on microorganisms is also one of the important reasons restricting the development of microbial remediation technology. Although chemical oxidation method is simple to operate and can rapidly degrade organic pollutants in soil, the large use of chemical agents has the risk of secondary environmental pollution such as soil compaction and oxidant pollution. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the present invention provides a device and method for chemically oxidizing and microbially remediating petroleum hydrocarbon contaminated soil, aiming to solve the limitations of single remediation technologies and meet the requirements of contaminated soil remediation.

[0005] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0006] A device for chemically oxidizing and microbially remediating petroleum hydrocarbon contaminated soil includes a soil treatment chamber. A soil inlet is provided at the top of the soil treatment chamber. A stirring device is provided at the bottom inside the soil treatment chamber. A chemical agent spraying system and a microorganism supply system are provided at a position near the top inside the soil treatment chamber. The chemical agent spraying system is used to spray chemical agents into the soil treatment chamber, and the microorganism supply system is used to supply microorganisms into the soil treatment chamber.

[0007] Furthermore, it further includes a crushing device, and the crushing device is arranged inside the soil inlet.

[0008] Further, it further includes a water replenishing system, and the water replenishing system is arranged at a position near the top in the soil treatment chamber.

[0009] Further, a support plate is arranged at a position near the top in the soil treatment chamber. A soil dropping port is formed in the support plate. The soil dropping port is communicated with the soil adding port through a soil conveying pipeline. The chemical agent spraying system, the microorganism supply system and the water replenishing system are connected to the lower end surface of the support plate.

[0010] Further, a temperature and humidity monitoring system and a PH monitoring system are arranged on the side wall of the soil treatment chamber.

[0011] Further, an air inlet is arranged at a position near the top of the side wall of the soil treatment chamber, and an air outlet is arranged at a position near the bottom of the side wall of the soil treatment chamber.

[0012] Further, the output end of the air outlet is connected with a tail gas treatment system.

[0013] Further, it further includes a soil storage container, and the soil storage container is arranged at the bottom of the soil treatment chamber. A soil discharge port communicated with the soil storage container is formed in the bottom of the soil treatment chamber.

[0014] Further, it further includes a driving device, and the driving device is arranged at the bottom of the soil treatment chamber. The output end of the driving device is connected with the stirring paddle connecting rod of the stirring device.

[0015] A method for chemically oxidizing and microbially remediating petroleum hydrocarbon-contaminated soil, using the device for chemically oxidizing and microbially remediating petroleum hydrocarbon-contaminated soil, includes:

[0016] Adding petroleum hydrocarbon-contaminated soil into the soil treatment chamber from the soil adding port. When the oil content rate of the petroleum hydrocarbon-contaminated soil is not lower than the set value, spraying a chemical agent into the soil treatment chamber by using the chemical agent spraying system, and stirring the petroleum hydrocarbon-contaminated soil by using the stirring device; when the oil content rate of the petroleum hydrocarbon-contaminated soil is lower than the set value, supplying microorganisms into the soil treatment chamber by using the microorganism supply system, and stirring the petroleum hydrocarbon-contaminated soil by using the stirring device.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] The device for chemically oxidizing and microbially remediating petroleum hydrocarbon-contaminated soil provided by the present invention can strengthen the degradation of soil organic pollutants by microorganisms through chemical pre-oxidation, thereby shortening the remediation cycle, improving the degradation efficiency and the adaptability of microorganisms to the site, and at the same time reducing the usage amount of chemical agents to avoid secondary pollution. The present invention pre-treats petroleum hydrocarbon pollutants by chemical means, and uses chemical methods to convert high-molecular petroleum hydrocarbons that are difficult to decompose into smaller molecular compounds or inorganic substances. This conversion process reduces the toxicity of petroleum hydrocarbons and increases the biodegradability of microorganisms. Microorganisms can further biodegrade petroleum hydrocarbon pollutants, making it easier for microorganisms to degrade pollutants, and finally achieving the effect of soil remediation.

[0019] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the following will briefly introduce the drawings required for use in the description of the specific embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the device for chemically oxidizing and microbially remediating petroleum hydrocarbon-contaminated soil of the present invention.

[0022] In the figure: 1 - soil treatment chamber; 2 - soil inlet; 3 - stirring device; 4 - chemical agent spraying system; 5 - microorganism supply system; 6 - crushing device; 7 - water replenishing system; 8 - support plate; 9 - air inlet; 10 - exhaust port; 11 - soil storage container; 12 - soil discharge port; 13 - temperature and humidity monitoring system; 14 - pH monitoring system; 15 - driving device; 16 - soil dropping port; 17 - soil conveying pipeline; 18 - movable cover plate. SPECIFIC EMBODIMENTS

[0023] To make the purposes, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0024] As Figure 1As shown in the figure, an apparatus for chemically oxidizing and microbially remediating petroleum hydrocarbon contaminated soil according to an embodiment of the present invention includes a soil treatment chamber 1. A soil inlet 2 is provided at the top of the soil treatment chamber 1. The soil inlet 2 is communicated with the soil treatment chamber 1, and soil is added into the soil treatment chamber 1 through the soil inlet 2. A stirring device 3 is provided at the bottom inside the soil treatment chamber 1 to stir the soil inside the soil treatment chamber 1. A chemical agent spraying system 4 and a microorganism supply system 5 are provided at a position near the top inside the soil treatment chamber 1. The chemical agent spraying system 4 is used to spray chemical agents into the soil treatment chamber 1, and the microorganism supply system 5 is used to supply microorganisms into the soil treatment chamber 1.

[0025] Specifically, petroleum hydrocarbon contaminated soil is added into the soil treatment chamber 1 from the soil inlet 2. When the oil content rate of the petroleum hydrocarbon contaminated soil is not less than the set value, the chemical agent spraying system 4 is used to spray chemical agents into the soil treatment chamber 1, and the stirring device 3 is used to stir the petroleum hydrocarbon contaminated soil. When the oil content rate of the petroleum hydrocarbon contaminated soil is lower than the set value, the microorganism supply system 5 is used to supply microorganisms into the soil treatment chamber 1, and the stirring device 3 is used to stir the petroleum hydrocarbon contaminated soil.

[0026] The chemical agent spraying system 4 can be started or not according to the requirement of the soil oil content rate when the crushed petroleum hydrocarbon soil enters the soil treatment chamber 1.

[0027] It should be noted that the microorganism supply system 5 is externally connected to a fermentation tank, and the fermentation tank is externally connected to a bacteria storage tank. The fermented microorganisms can directly enter the bacteria storage tank through a pipeline. The bacteria storage tank is externally connected to a winding type peristaltic pump to transport the microbial liquid into the soil treatment chamber 1.

[0028] In one embodiment, as Figure 1 shown, the apparatus for chemically oxidizing and microbially remediating petroleum hydrocarbon contaminated soil further includes a crushing device 6. The crushing device 6 is arranged inside the soil inlet 2. That is to say, the petroleum hydrocarbon contaminated soil is put into the soil inlet 2 and is crushed by the crushing device 6. The crushing device 6 can crush the petroleum hydrocarbon contaminated soil into particles with a particle size ≤ 40 mesh, so that the soil can react better with the chemical agents and microorganisms.

[0029] In one embodiment, as Figure 1 shown, the apparatus for chemically oxidizing and microbially remediating petroleum hydrocarbon contaminated soil further includes a water replenishing system 7. The water replenishing system 7 is arranged at a position near the top inside the soil treatment chamber 1. The water replenishing system 7 can start according to the requirement of the soil moisture content rate when the crushed petroleum hydrocarbon soil enters the soil treatment chamber 1, so that the moisture content rate of the soil is maintained at 30% - 40%.

[0030] In one embodiment, as Figure 1As shown, a support plate 8 is provided at a position near the top inside the soil treatment chamber 1. A soil dropping port 16 is formed on the support plate 8, and the soil dropping port 16 is communicated with the soil inlet 2 through a soil conveying pipeline 17. The chemical agent spraying system 4, the microorganism supply system 5, and the water replenishing system 7 are connected to the lower end surface of the support plate 8. Specifically, the support plate 8 provides the installation of the chemical agent spraying system 4, the microorganism supply system 5, and the water replenishing system 7. The pulverized soil enters the soil treatment chamber 1 from the soil dropping port 16 through the soil conveying pipeline 17.

[0031] Preferably, as Figure 1 shown, a movable cover plate 18 is hinged below the soil dropping port 16. When the pulverization ends, the movable cover plate 18 will cover the soil dropping port 16.

[0032] Preferably, as Figure 1 shown, a temperature and humidity monitoring system 13 and a pH monitoring system 14 are provided on the side wall of the soil treatment chamber 1. Exemplarily, the temperature and humidity monitoring system 13 and the pH monitoring system 14 are located on the left side of the soil treatment chamber 1, and can detect the temperature, humidity, and pH in the treatment chamber in real time.

[0033] In one embodiment, as Figure 1 shown, an air inlet 9 is provided at a position near the top of the side wall of the soil treatment chamber 1, and an exhaust port 10 is provided at a position near the bottom of the side wall of the soil treatment chamber 1.

[0034] Exemplarily, an air inlet 9 is provided above the left wall of the soil treatment chamber 1. The air inlet 9 is externally connected to a blower to convey air into the treatment chamber. At the same time, an exhaust port 10 is provided below the right wall of the soil treatment chamber 1 for discharging the tail gas generated by the reaction. The exhaust port 10 is connected to a tail gas treatment device (not shown in the figure) for purifying the gas generated in the treatment chamber, and the outlet of the tail gas treatment device is communicated with the atmosphere.

[0035] In one embodiment, as Figure 1 shown, the device for chemically oxidizing and microbially remediating petroleum hydrocarbon-contaminated soil further includes a soil storage container 11. The soil storage container 11 is arranged at the bottom of the soil treatment chamber 1. A soil discharge port 12 communicated with the soil storage container 11 is formed at the bottom of the soil treatment chamber 1. The treated soil enters the soil storage container 11 through the soil discharge port 12.

[0036] Preferably, a driving device 15 is provided at the bottom of the soil treatment chamber 1. The output end of the driving device 15 is connected to the stirring paddle connecting rod of the stirring device 3. The stirring paddle connecting rod is horizontally arranged in the treatment chamber, and a plurality of stirring paddles are arranged at intervals along the axial direction on the stirring paddle connecting rod. Exemplarily, the driving device 15 adopts a stirring motor, and the stirring motor is arranged outside the bottom of the treatment chamber for driving the stirring paddle connecting rod to rotate.

[0037] For example, the soil treatment chamber 1 uses extruded polystyrene (XPS) thermal insulation material, which can ensure the stability of the soil reaction temperature in real time. The box body of the soil treatment chamber 1 is cylindrical and the inner corners are all arc-shaped, without stirring dead corners.

[0038] In one embodiment, when using the above device for chemically oxidizing and microbially remediating petroleum hydrocarbon-contaminated soil to remediate petroleum hydrocarbon-contaminated soil, the specific steps are as follows:

[0039] Step 1): First, the petroleum hydrocarbon-contaminated soil is naturally air-dried until the moisture content of the soil is 2%-3%, which is convenient for soil pulverization.

[0040] Step 2): The air-dried soil is fed into the pulverizing device 6 from the soil inlet 2, and the particle size of the soil treated by the pulverizing device 6 is ≤40 mesh.

[0041] Step 3): The pulverized soil enters the soil treatment chamber 1 from the soil inlet 16 through the soil conveying pipeline 17. Start the stirring device 3. If the oil content of the soil is higher than 5%, chemical oxidation treatment is carried out, that is, the oxidant is sprayed through the chemical agent spraying system 4. According to the requirement of the soil moisture content, when the temperature and humidity monitoring system 13 detects that the soil moisture content is lower than 30%, the water replenishing system 7 will be automatically started to keep the soil moisture content at 30%-40%. The spraying times and reaction time of the chemical oxidant are selected according to the oil content of the soil; among them, the oxidant can select the following different oxidant types and proportions according to the soil properties and its oil content, for example: hydrogen peroxide, potassium permanganate, potassium permanganate, sodium persulfate, calcium oxide, sodium percarbonate, potassium ferrate, etc.

[0042] Step 4): If the oil content of the soil is lower than 5%, the microbial supply system 5 is directly started; the microbial supply system 5 is externally connected to a fermentation tank, and the fermentation tank is externally connected to a bacteria storage tank. The fermented microorganisms can directly enter the bacteria storage tank through a pipeline. The bacteria storage tank is externally connected to a winding type peristaltic pump to transport the microbial liquid to the treatment chamber; during the microbial treatment process, petroleum hydrocarbon-degrading microorganisms are added, and the culture temperature is 30°C - 37°C. A certain nutrient agent is added to ensure the growth of the strains. The nutrient agent is biological organic fertilizer, and the C:N:P in the nutrient agent is 100:10:1.

[0043] Step 5): During the microbial treatment process, the nutrient solution is sprayed through the chemical agent spraying system 4, and the microbial species and their proportions are selected according to the oil content and other physical and chemical properties of the oil-containing sludge to be treated.

[0044] Example

[0045] 1. The soil used in this example experiment was collected from around the abandoned well sites of Changqing Oilfield. The soil at a depth of 0m - 1m underground was collected, and the concentration of petroleum pollutants was 10% (w / w). It was sealed in bags and stored for later use.

[0046] 2. Air-dry the collected soil naturally. When it has been air-dried for 3 days, measure the moisture content to be 2.4%.

[0047] 3. Chemical remediation: The air-dried soil is fed into the pulverizing device 6 from the soil inlet 2. Start the pulverizing device 6 to pulverize the soil, and the particle size of the pulverized soil ≤ 40 mesh; the pulverized soil enters the soil treatment chamber 1 from the soil dropping port 16 through the soil conveying pipeline 17. Start the chemical agent spraying system 4 to spray the chemical agent into the reaction chamber. At the same time, start the stirring device 3 to make the chemical oxidant and the soil contact and mix fully. After the addition of the oxidant is completed, supplement water according to the soil moisture content. After stirring for 20 minutes, turn off the stirring device 3 for reaction. Spray the oxidant every 12 hours, and add the chemical oxidant a total of 5 times. Start the stirring device for 20 minutes each time the chemical oxidant is added; measure the oil content in the soil after 96 hours. The dosage, concentration and number of times of the oxidation agent are determined based on the pollutant concentration through laboratory bench-scale tests.

[0048] 4. Bioremediation: After the petroleum hydrocarbon-contaminated soil has been chemically oxidized, start the microbial supply system 5 and the chemical agent spraying system 4 to spray the nutrient agent. At the same time, start the stirring device to mix the contaminated soil and the microorganisms fully. Keep stirring and ventilating to ensure there is sufficient oxygen in the reaction chamber. Add nutrients and stir every 24 hours, and supplement water at the same time to ensure that the reaction system is maintained at 30°C - 37°C; supplement the relevant microbial inoculum every 5 days.

[0049] 5. Take samples every 5 days to measure the oil content in the soil.

[0050] 6. Through the above experimental steps, study the chemical oxidation combined with bioremediation of petroleum hydrocarbon-contaminated soil. According to the experimental results, after 25 days, the chemical and microbial combined treatment of petroleum hydrocarbon-contaminated soil reduces the oil content of the soil with an oil content of 10% to 0.35%, indicating that the device for chemical oxidation combined with bioremediation of petroleum hydrocarbon-contaminated soil of the present invention can effectively reduce the petroleum hydrocarbon content in the soil.

[0051] Specifically, the present invention has the following advantages:

[0052] (1) High efficiency: The chemical oxidant can quickly decompose the difficult-to-degrade petroleum hydrocarbon pollutants, reduce their toxicity, and increase the biodegradability of microorganisms. Microorganisms can further biodegrade the petroleum hydrocarbon pollutants, ultimately achieving the effect of soil remediation.

[0053] (2) Economic feasibility: Compared with other petroleum hydrocarbon pollution treatment technologies, the cost of chemically combined with microbial treatment of petroleum hydrocarbon-contaminated soil is lower and it can be reused.

[0054] (3) Less secondary pollution: This method does not affect the biological and physical properties of the soil and reduces the possibility of secondary pollution.

[0055] (4) Environmental friendliness: Compared with traditional physical methods, the method of chemically combined with microorganisms to treat petroleum hydrocarbon contaminated soil has better environmental friendliness and does not require the destruction of the soil structure.

[0056] (5) Wide applicability: This method is applicable to the remediation of various petroleum hydrocarbon pollutants, such as oil products, coal tar pitch, natural gas, petroleum saturated soil, unsaturated soil and groundwater, etc.

[0057] (6) Precise control of factors such as temperature, humidity, oxidant, moisture and nutrients can be achieved. At the same time, these substances can be replenished in-situ, and stirring enhances the mass transfer efficiency of the soil. Therefore, more sufficient contact can be formed among pollutants, oxidants and microorganisms, improving the stability of the treatment efficiency.

[0058] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0059] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or communicable with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the present invention, unless otherwise clearly defined or limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "over" and "on top of" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. A first feature being "under", "below" and "beneath" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is less than that of the second feature.

[0062] In the present invention, the terms "an embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0063] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present invention, used to illustrate the technical solutions of the present invention, rather than to limit it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions recorded in the foregoing embodiments or can easily think of changes, or make equivalent replacements for some of the technical features; and these modifications, changes or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An apparatus for chemically oxidizing and microbially remediating petroleum hydrocarbon - contaminated soil, characterized in that, it includes a soil treatment chamber (1), a soil inlet (2) is arranged at the top of the soil treatment chamber (1), a stirring device (3) is arranged at the bottom inside the soil treatment chamber (1), a chemical agent spraying system (4) and a microorganism supply system (5) are arranged at a position near the top inside the soil treatment chamber (1), the chemical agent spraying system (4) is used for spraying chemical agents into the soil treatment chamber (1), and the microorganism supply system (5) is used for supplying microorganisms into the soil treatment chamber (1).

2. The apparatus for chemically oxidizing and microbially remediating petroleum hydrocarbon - contaminated soil according to claim 1, characterized in that, it further includes a crushing device (6), and the crushing device (6) is arranged inside the soil inlet (2).

3. The apparatus for chemically oxidizing and microbially remediating petroleum hydrocarbon - contaminated soil according to claim 1, characterized in that, it further includes a water replenishing system (7), and the water replenishing system (7) is arranged at a position near the top inside the soil treatment chamber (1).

4. The apparatus for chemically oxidizing and microbially remediating petroleum hydrocarbon - contaminated soil according to claim 3, characterized in that, a support plate (8) is arranged at a position near the top inside the soil treatment chamber (1), a soil - falling port (16) is formed on the support plate (8), the soil - falling port (16) is communicated with the soil inlet (2) through a soil conveying pipeline (17), and the chemical agent spraying system (4), the microorganism supply system (5) and the water replenishing system (7) are connected to the lower end surface of the support plate (8).

5. The apparatus for chemically oxidizing and microbially remediating petroleum hydrocarbon - contaminated soil according to claim 3, characterized in that, a temperature and humidity monitoring system (13) and a pH monitoring system (14) are arranged on the side wall of the soil treatment chamber (1).

6. The apparatus for chemically oxidizing and microbially remediating petroleum hydrocarbon - contaminated soil according to claim 1, characterized in that, an air inlet (9) is arranged at a position near the top on the side wall of the soil treatment chamber (1), and an exhaust port (10) is arranged at a position near the bottom on the side wall of the soil treatment chamber (1).

7. The apparatus for chemically oxidizing and microbially remediating petroleum hydrocarbon - contaminated soil according to claim 6, characterized in that, the output end of the exhaust port (10) is connected to a tail gas treatment system.

8. The apparatus for chemically oxidizing and microbially remediating petroleum hydrocarbon - contaminated soil according to claim 1, characterized in that, it further includes a soil storage container (11), the soil storage container (11) is arranged at the bottom of the soil treatment chamber (1), and a soil discharge port (12) communicated with the soil storage container (11) is formed at the bottom of the soil treatment chamber (1).

9. The apparatus for chemically oxidizing and microbially remediating petroleum hydrocarbon - contaminated soil according to claim 1, characterized in that, Further included is a driving device (15), the driving device (15) is arranged at the bottom of the soil treatment chamber (1), and the output end of the driving device (15) is connected to the stirring paddle connecting rod of the stirring device (3).

10. A method for chemically oxidizing and microbially remediating petroleum hydrocarbon-contaminated soil, characterized in that, using the device for chemically oxidizing and microbially remediating petroleum hydrocarbon-contaminated soil according to any one of claims 1 to 9, comprising: adding petroleum hydrocarbon-contaminated soil into the soil treatment chamber (1) from the soil inlet (2). When the oil content rate of the petroleum hydrocarbon-contaminated soil is not lower than the set value, spraying a chemical agent into the soil treatment chamber (1) by using the chemical agent spraying system (4), and stirring the petroleum hydrocarbon-contaminated soil by using the stirring device (3); when the oil content rate of the petroleum hydrocarbon-contaminated soil is lower than the set value, supplying microorganisms into the soil treatment chamber (1) by using the microorganism supply system (5), and stirring the petroleum hydrocarbon-contaminated soil by using the stirring device (3).

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