A mercury mining area soil pollution control agent and its preparation method and application

Abstract

The invention discloses a mercury mining area soil pollution control agent and a preparation method and application thereof, and specifically relates to the technical field of soil remediation agents. The control agent comprises an organic matrix containing arbuscular fungi, humic acid and mercury-resistant plants, and the ratio of the organic matrix of the arbuscular fungi to the humic acid is (1-3):1. The combined application of arbuscular fungi and humic acid in the mercury-contaminated soil of the invention can greatly increase the infection rate of arbuscular fungi, and improve the biomass, mercury tolerance concentration and mercury extraction of mercury remediation plants. Its mercury pollution control effect and plant remediation effect exceed the effect of applying humic acid or arbuscular fungi alone.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation agents, and in particular to a mercury mining area soil pollution control agent, a preparation method and an application thereof. Background Art

[0002] Mercury is an important global pollutant with high toxicity and easy migration. It not only poses a great threat to human health, but also harms the growth and development of most plants. Mercury pollution in the soil of mercury mine tailings is relatively serious. There is a great risk of releasing mercury into the environment, which requires pollution control, and limits the ecological restoration of vegetation in the tailings area. Therefore, a technology for reclamation and restoration of tailings areas and restoration of mercury-contaminated soil is urgently needed.

[0003] The existing methods for soil pollution control in mercury mining areas mainly include physical, chemical and biological methods.

[0004] The main physical methods are the guest soil method and thermal desorption technology. Among them, the guest soil method is to dig out the contaminated soil and replace it with clean soil. Chinese patent CN113000574A is a method for repairing acidic soil contaminated by mine mercury, including the following steps: pretreatment of the contaminated soil area to be repaired, in-situ solidification / stabilization repair, barrier and anti-seepage, construction of retaining walls, guest soil covering, construction of drainage ditches, and restoration of vegetation. However, the invention firstly needs to add other repair agents, and secondly, this method has a large amount of engineering work, requires a large amount of clean soil, and can only treat the surface soil, and is powerless against mercury pollution in deep soil. At the same time, if the excavated contaminated soil is not handled properly, it will cause secondary pollution.

[0005] Thermal desorption technology can make mercury volatilize from the soil. Chinese patent CN116851431A, a mercury-contaminated soil ex situ thermal desorption device and method, includes: a preheating feeding system, used to preheat the pretreated contaminated soil and feed it into the heat treatment system; a heat treatment system, used to electrically heat the contaminated soil; a heat exchange system, used to initially cool the flue gas generated by the heat treatment system; wherein the cooling fluid after heat exchange in the heat exchange system is used to preheat the contaminated soil in the preheating feeding system; a flue gas treatment system, used to treat the flue gas after initial cooling. However, this patent requires special equipment, high energy consumption, expensive equipment, high processing cost, and a perfect gas collection system is required during the volatilization of mercury, otherwise it is easy to cause mercury vapor leakage and pollute the atmospheric environment.

[0006] In the chemical method, Chinese patent CN106433649A, a chemical eluent for remediating mercury contaminated soil and its application method, belongs to the field of contaminated soil remediation technology. The eluent is composed of independent agent A and agent B, wherein agent A includes hydrochloric acid, potassium iodide and sodium thiosulfate solution, and agent B includes sodium hydroxide and sodium hypochlorite solution. The application method comprises the following steps: (1) soil pretreatment, crushing, picking out debris and stones, etc.; (2) adding eluent A and mercury-contaminated soil, maintaining the ratio of contaminated soil to eluent at 1:10-1:20, and stirring continuously or intermittently for 4-8 hours; (3) after solid-liquid separation, adding water to the residual soil for clean elution; (4) adding eluent B to the soil after clean elution in step (3), and continuing to stir continuously or intermittently for 4-8 hours; (5) after solid-liquid separation, adding water to the residual soil for clean elution, and then backfilling can be directly performed. However, the eluent A composed of hydrochloric acid, potassium iodide and sodium thiosulfate solution and the eluent B composed of sodium hydroxide and sodium hypochlorite solution are used as the eluent combination. Step-by-step elution can improve the elution efficiency of soil mercury, but the strong acidity of hydrochloric acid will destroy the physical and chemical properties of the soil, and the sodium thiosulfate will react with strong acid to reduce the elution effect.

[0007] Biological remediation of mercury-contaminated soil has the advantages of low cost and environmental friendliness. It can be repaired in situ using microorganisms or plants without destroying the soil structure. It can reduce the risk of secondary pollution and has a good effect on low-concentration mercury pollution, which helps to achieve ecologically sustainable soil remediation.

[0008] Chinese patent CN110484275A, a method and reagent for repairing mercury and chromium deep contaminated soil with anaerobic sulfate-reducing bacteria and iron-based materials. The mercury and chromium contaminated soil repair reagent includes an iron-based material and an anaerobic sulfate-reducing bacteria solution; the iron-based material is obtained by reacting iron-containing silicate minerals with oxalic acid in an aqueous medium. However, anaerobic sulfate-reducing bacteria is a microorganism, and its growth and metabolic activities are very sensitive to environmental conditions. In an actual deep contaminated soil environment, factors such as temperature, pH value, and soil texture may vary greatly at different depths. Although the oxygen content in the deep soil is low, if there are local ventilation channels or oxygen enters due to interference from external factors during the repair process, it will be toxic to anaerobic microorganisms, interfere with their normal metabolism, and reduce the repair efficiency.

[0009] Using phytoremediation technology, mercury can be extracted from the soil and vegetation in the mining area can be restored. However, the current practice of vegetation restoration in mercury mining areas is greatly limited by the high mercury content and poor nutrition in the soil. Although some restoration cases have applied mercury-resistant vegetation such as poplar and cyperus, the vegetation biomass is small and needs to be replanted all year round. After years of artificial planting, it is still difficult to form a stable self-sustaining capacity. Summary of the invention

[0010] To this end, the present invention provides a mercury mining area soil pollution control agent and a preparation method and application thereof to solve the above-mentioned problems.

[0011] In order to achieve the above object, the present invention provides the following technical solutions:

[0012] According to the first aspect of the present invention, a mercury mining area soil pollution control agent is provided, the control agent includes an organic matrix containing arbuscular fungi, humic acid and mercury-resistant plants, the ratio of the organic matrix of the arbuscular fungi to the humic acid is (1-3):1; as an example, the preferred ratio of the organic matrix of the arbuscular fungi to the humic acid is 1:0.5.

[0013] Furthermore, the organic matrix of arbuscular fungi is prepared by mixing a mixed bacterial agent of Pipe Spores of Moses and Rhizocystis radici with an organic breeding matrix, sowing alfalfa seeds, removing vegetation and main roots after breeding, collecting the organic matrix that is enriched with arbuscular fungi, and sieving to obtain the organic matrix containing arbuscular fungi.

[0014] Furthermore, the ratio of the mossea cysts to the root cysts is 1:(0.5-1.5).

[0015] Furthermore, the weight ratio of the mixed bacterial agent to the organic breeding matrix is ​​1:100-200.

[0016] As an example, the arbuscular fungi are a mixture of Pipe Spores of Moses and Rhizocystis radix (at a spore ratio of 1:1) and an organic breeding matrix, with an inoculation ratio of the fungus to the matrix of 1:150 by weight; the mixture is placed in a breeding tray, alfalfa seeds are sown, and the seedlings are grown in a greenhouse for 60 days; the above-ground vegetation and main roots are removed, and the organic matrix rich in arbuscular fungi for propagation is collected and sieved through a 2 mm sieve for later use.

[0017] According to a second aspect of the present invention, a method for preparing any mercury mining area soil pollution control agent as described above is provided, the method comprising weighing the control agent raw materials in proportion and mixing them evenly to obtain the control agent.

[0018] According to a third aspect of the present invention, a method for treating polluted soil in a mining area using any of the above mercury mining area soil pollution treatment agents is provided, the method comprising:

[0019] Step 1: Level the land, mix the mercury mine soil pollution control agent with clay and surface soil, spread it on the surface, lay out the sprinkler irrigation network, and water it steadily;

[0020] Step 2: Arrange mercury-resistant plants according to the "grass-shrub" pattern, cover with a thin layer of soil and water after planting.

[0021] As an example, the application rate of organic substrate for propagating fungi is: 0.5-1.5 kg / m 2, the application amount of humic acid is: 0.2-0.8kg / m 2 , the application rate of clay is 1-2kg / m 2 More preferably, the application rate of the organic matrix for propagating fungi is: 1kg / m 2 , the application amount of humic acid is: 0.5kg / m 2 , the application rate of clay is 1.5kg / m 2 .

[0022] Furthermore, in step 1, the surface soil refers to the soil within 20 cm of the surface.

[0023] Furthermore, in step 1, the watering stabilization time is 1-3 weeks.

[0024] Furthermore, in the step 2, the method of configuring mercury-resistant plants according to the "grass-shrub" method is to sow herbaceous plants on the flat surface soil, such as ramie and centipede grass; cover with a thin layer of soil and water; and then transplant shrubs such as big-leaf Buddleja and honeysuckle.

[0025] As an example, it is preferred to transplant shrubs 2 months after the herbaceous plants are planted.

[0026] Furthermore, in step 2, the herbaceous plants are planted at a density of 100-150 plants / m 2 ; The shrub planting density is about 1-2 plants / m 2 .

[0027] The present invention has the following advantages:

[0028] The mercury mining area soil pollution control agent of the present invention contains humic acid, which is beneficial to improving the organic matter in the mining area soil; the humic acid can combine with mercury to fix the mercury and reduce the bioavailability of mercury, and can also enhance the mercury absorption capacity of mercury restoration plants, which is beneficial to the use of plant restoration to control mercury pollution in mining area soil.

[0029] The organic matrix of arbuscular fungi in the mercury mine soil pollution control agent of the present invention is beneficial to improving the organic matter of the poor soil in the mining area and providing nutrients for mercury restoration plants; the organic matrix covering the mining area is beneficial to wind protection and water conservation, and while conserving the soil, it reduces the output of mercury in the mining area; the arbuscular fungi can help mercury-contaminated plants improve their drought resistance, adapt to low-nutrient environments, and improve mercury tolerance.

[0030] The combined application of arbuscular fungi and humic acid in mercury-contaminated soil of the present invention can greatly increase the infection rate of arbuscular fungi, and improve the biomass, mercury tolerance concentration and mercury extraction of mercury-remediation plants. Its mercury pollution control effect and plant restoration effect exceed the effect of applying humic acid or arbuscular fungi alone. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0032] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0033] Figure 1 This is a graph showing the effect of humic acid and arbuscular fungi on the infection rate of arbuscular fungi provided in Example 5 of the present invention;

[0034] Figure 2 The effects of humic acid and arbuscular fungi on mercury extraction from mercury-resistant plants provided in Example 6 of the present invention;

[0035] Figure 3 The soil treatment effect of the mercury mining area soil pollution treatment agent provided in Example 7 of the present invention on the mercury mining area;

[0036] Figure 4 This is the plant restoration effect of the mercury mine area soil pollution control agent provided in Example 8 of the present invention on the mercury mine area. DETAILED DESCRIPTION

[0037] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The described Pipetomycopsis mosseae and Rhizocystis radix were purchased from China Microorganism Collection Center, and the national microbial resource platform numbers were: 1511C0001BGCAM0060 and 1511C0001BGCAM0042, respectively.

[0039] Example 1

[0040] This embodiment provides a mercury mining area soil pollution control agent:

[0041] 1 part of organic substrate for arbuscular fungi, 0.5 part of humic acid and mercury-resistant plants (herbs: ramie and centipede grass; the ratio is 1:1, and the herbaceous plant planting density is about 150 plants / m 2 ; Shrubs: Buddleja macrophylla and Honeysuckle, the ratio is 1:1, and the shrub planting density is about 2 plants / m 2 ).

[0042] Organic matrix for arbuscular fungi: Mix the mixture of Pipe Spores of Moses and Rhizocystis radicifolia (spore ratio 1:1) with the organic breeding matrix, and the inoculation ratio of the strain to the matrix is ​​1:150 by weight. Put it into the breeding tray, sow alfalfa seeds, and grow seedlings in the greenhouse for 60 days. Remove the above-ground vegetation and taproots, collect the organic matrix rich in arbuscular fungi, and pass it through a 2mm sieve for later use.

[0043] Example 2

[0044] This embodiment provides a mercury mining area soil pollution control agent:

[0045] 1 part of organic substrate for arbuscular fungi, 1 part of humic acid and mercury-resistant plants (herbs: ramie and centipede grass, the ratio is 1:1, and the herbaceous plant planting density is about 100 plants / m 2 ; Shrubs: Buddleja macrophylla and Honeysuckle, the ratio is 1:1, and the shrub planting density is about 1 plant / m 2 ).

[0046] Organic matrix for arbuscular fungi: Mix the mixture of Pipe Spores of Moses and Rhizocystis radicifolia (spore ratio 1:0.5) with the organic breeding matrix, and the inoculation ratio of the strain to the matrix is ​​1:100 by weight. Put it into the breeding tray, sow alfalfa seeds, and grow seedlings in the greenhouse for 60 days. Remove the above-ground vegetation and taproots, collect the organic matrix rich in arbuscular fungi, and pass it through a 2mm sieve for later use.

[0047] Example 3

[0048] This embodiment provides a mercury mining area soil pollution control agent:

[0049] 3 parts of organic substrate for arbuscular fungi, 1 part of humic acid and mercury-resistant plants (herbs: ramie and centipede grass, the ratio is 1:1, and the herbaceous plant planting density is about 120 plants / m 2 ; Shrubs: Buddleja macrophylla and Honeysuckle, the ratio is 1:1, and the shrub planting density is about 1.5 plants / m 2 ).

[0050] Organic matrix for arbuscular fungi: Mix the mixture of Pipe Spores of Moses and Rhizocystis radicifolia (spore ratio 1:1.5) with the organic breeding matrix, and the inoculation ratio of the strain to the matrix is ​​1:200 by weight. Put it into the breeding tray, sow alfalfa seeds, and grow seedlings in the greenhouse for 60 days. Remove the above-ground vegetation and taproots, collect the organic matrix rich in arbuscular fungi, and pass it through a 2mm sieve for later use.

[0051] Example 4

[0052] This embodiment provides a method for treating soil pollution in a mercury mine area using the mercury mine area soil pollution treatment agent of embodiments 1-3:

[0053] Step 1: Remove large rocks from the ground, break up small rocks and level the ground. Mix the organic matrix of the fungus, humic acid and clay with the 20cm soil layer on the ground and spread it on the ground. The application rate of the organic matrix of the fungus is: 0.5-1.5kg / m 2 , the application amount of humic acid is: 0.2-0.8kg / m 2 , the application rate of clay is 1-2kg / m 2 More preferably (subsequent experiments will use more preferred dosages), the application rate of organic substrate for expanding fungal clumps is: 1kg / m 2 , the application amount of humic acid is: 0.5kg / m 2 , the application rate of clay is 1.5kg / m 2 After the soil layer is laid flat, the sprinkler irrigation network is laid out and watering is carried out steadily for 2 weeks.

[0054] Step 2: Configure mercury-resistant plants according to the "grass-shrub" pattern, and mainly select native plant species with high biomass. Appropriately densely plant herbs and shrubs in the early stage of vegetation recovery. First, sow ramie and centipede grass seeds on the surface of the mixed soil in step 1 at a ratio of 1:1, cover with thin soil and water. The grass seeds should be disinfected with potassium permanganate solution before use. The planting density of herbaceous plants is about 100-150 plants / m 2 , 2 months after planting, transplant two shrubs, Buddleja macrophylla and Honeysuckle, in a ratio of 1:1, and the shrub planting density is about 1-2 plants / m 2 .

[0055] Example 5

[0056] In order to explore the effects of combined application of humic acid and arbuscular fungi on arbuscular fungi in the roots of mercury-remediated plants, the cultivation experiment of Rhizoma Cyrthospermi was carried out in the laboratory using contaminated soil from the mercury mining area in Guizhou (total mercury content was 34.26 mg / kg).

[0057] The experiment set up 4 treatments, namely: blank control group: no addition of humic acid and arbuscular fungi; control group 1: only humic acid group; control group 2: only arbuscular fungi group; experimental group: mercury mine soil pollution control agent in Example 1: combined addition of humic acid and arbuscular fungi group. The remediation method of Example 4 was used. Among them, each group was set up with 5 parallels, and the rhizosphere soil was collected 2 months after the planting of Rhizoma Cyrthospermi, and the infection rate was determined by trypan blue staining.

[0058] The results showed that the control group only reached 22.98% ± 1.53% of the arbuscular fungus infection rate, and the addition of humic acid or arbuscular fungi alone could increase the arbuscular fungus infection rate to 31.67% and 48.29%, respectively (e.g. Figure 1 The combined application of humic acid and arbuscular fungi can significantly increase the arbuscular fungi infection rate of R. cyrtonema to 68.38%, which may be beneficial to improve R. cyrtonema's tolerance to mercury and increase its absorption of mercury in the soil.

[0059] Example 6

[0060] In order to verify the effect of the combined application of humic acid and arbuscular fungi on the mercury extraction ability of mercury-resistant plants, the contaminated soil in the mercury mining area of ​​Guizhou (total mercury content of 34.26 mg / kg) was used to carry out the cultivation experiment of Rhizoma Cyrthospermi in the laboratory. Two treatments were set up, namely: a control group (without the addition of humic acid and arbuscular fungi) and an experimental group: the mercury mining area soil pollution control agent with the addition of humic acid and arbuscular fungi in Example 1. The remediation method of Example 4 was used. Each group was set up with 5 parallels. After 2 months of planting, the aboveground part and the root system were collected respectively. The mercury content in Rhizoma Cyrthospermi was determined by atomic fluorescence spectrometry after digestion with aqua regia, and the absorption of mercury by Rhizoma Cyrthospermi was calculated. The results showed that the combined application of humic acid and arbuscular fungi significantly increased the mercury content in the aboveground part and the root system, and at the same time increased the biomass of Rhizoma Cyrthospermi, which indicated that the application of humic acid and arbuscular fungi improved the tolerance of Rhizoma Cyrthospermi to mercury (such as Figure 2 The total amount of mercury in each plant of Rhizoma Cyrthospermi was further calculated, and it was found that the mercury absorption by the aboveground part and root system of Rhizoma Cyrthospermi in the group with humic acid and arbuscular fungi was significantly higher than that in the control group. This indicates that the combined application of humic acid and arbuscular fungi can greatly promote the mercury extraction capacity of mercury-resistant plants.

[0061] Example 7

[0062] In order to verify the therapeutic effect of the combined application of humic acid and arbuscular fungi on the soil in mercury mining areas (the remediation agent of Example 1 + the remediation method of Example 4), a field test was conducted in a mercury mining area in Guizhou. The area of ​​the plot is 10×10m, and the mercury content in the soil is as high as 1526.75mg / kg. According to the specific methods described in this technology, the propagation of arbuscular fungi, the surface preparation of the mining area, the application of humic acid and arbuscular fungi, and the configuration and planting of mercury remediation plants are carried out respectively. Before and after 2 years of treatment, the surface mixed soil samples (0-20cm) were taken, and the soil organic matter and nitrogen content were determined by elemental analyzer, the total mercury content in the soil was determined by aqua regia digestion-atomic fluorescence method, and the water-soluble mercury and exchangeable mercury in the soil were determined by Tisser grouping method to calculate the biologically effective mercury content. The results showed that after the combined application of humic acid and arbuscular fungi and the planting of mercury remediation plants for treatment, the soil organic matter and total nitrogen in the mercury mining area increased significantly, which shows that the combined application of humic acid and arbuscular fungi improved the soil and provided a nutrient basis for mercury remediation plants. After two years of treatment, such as Figure 3 As shown in the figure, the total mercury and bioavailable mercury in the soil decreased from 1526.75 mg / kg and 59.53 ug / kg to 934.86 mg / kg and 26.78 ug / kg, respectively, with removal rates as high as 39.77% and 55.02%. These results show that the combined application of humic acid and arbuscular fungi has a good treatment effect on the soil in mercury mining areas with high mercury content.

[0063] Example 8

[0064] In order to verify the therapeutic effect of the combined application of humic acid and arbuscular fungi on the soil in mercury mining areas, a field experiment was conducted in a mercury mining area in Guizhou. The area of ​​the plot is 10 m×10 m, and the mercury content in the soil is as high as 1526.75 mg / kg. According to the specific methods described in this technology, the propagation of arbuscular fungi, the surface preparation of the mining area, the application of humic acid and arbuscular fungi, and the configuration and planting of mercury remediation plants were carried out respectively. Before and after 2 years of treatment, a sample square frame of 0.5 m×0.5 m was laid out to measure the vegetation coverage, height and aboveground biomass. The results are as follows Figure 4 As shown in the figure, the combined application of humic acid and arbuscular fungi increased the aboveground biomass, height and cover of vegetation from 4.89 g / m 2 , 2.41cm and 10% increased to 397.26g / m 2 , 58.9cm and 85%. This shows that the combined application of humic acid and arbuscular fungi has a good restoration effect on vegetation restoration in mercury mining areas.

[0065] In summary, the mercury mining soil pollution control agent of the present invention contains humic acid, which is beneficial to increasing the organic matter in the mining soil; humic acid can combine with mercury to fix mercury and reduce the biological effectiveness of mercury, and can also enhance the mercury absorption capacity of mercury restoration plants, which is beneficial to the use of plant restoration to control mercury pollution in mining soil.

[0066] The organic matrix of arbuscular fungi in the mercury mine soil pollution control agent of the present invention is beneficial to improving the organic matter of the poor soil in the mining area and providing nutrients for mercury restoration plants; the organic matrix covering the mining area is beneficial to wind protection and water conservation, and while conserving the soil, it reduces the output of mercury in the mining area; the arbuscular fungi can help mercury-contaminated plants improve their drought resistance, adapt to low-nutrient environments, and improve mercury tolerance.

[0067] The combined application of arbuscular fungi and humic acid in mercury-contaminated soil of the present invention can greatly increase the infection rate of arbuscular fungi, and improve the biomass, mercury tolerance concentration and mercury extraction of mercury-remediation plants. Its mercury pollution control effect and plant restoration effect exceed the effect of applying humic acid or arbuscular fungi alone.

[0068] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A mercury mining area soil pollution control agent, characterized in that: The treatment agent comprises an organic matrix containing arbuscular fungi, humic acid and mercury-resistant plants, wherein the ratio of the organic matrix of the arbuscular fungi to the humic acid is (1-3):1; the organic matrix of the arbuscular fungi is prepared by mixing a mixed bacterial agent of Piperacium mosesii and Rhizocystis radix with an organic breeding matrix, and then sowing alfalfa seeds; after breeding, removing vegetation and main roots, collecting the organic matrix that is propagated and rich in arbuscular fungi, and sieving to obtain the organic matrix containing arbuscular fungi; the mercury-resistant plants are herbs and shrubs, wherein the herbs are Ramie serrata and Centipedegrass; and the shrubs are Buddleja macrophylla and Honeysuckle.

2. The mercury mining area soil pollution control agent according to claim 1, characterized in that: The ratio of the mossea cysts to the root cysts is 1:(0.5-1.5).

3. The mercury mining area soil pollution control agent according to claim 1, characterized in that: The weight ratio of the mixed bacterial agent to the organic breeding matrix is ​​1:100-200.

4. A method for treating polluted soil in a mining area using the mercury mining area soil pollution treatment agent according to any one of claims 1 to 3, characterized in that: The method comprises: Step 1: level the land, mix the organic matrix containing arbuscular fungi, humic acid, clay and surface soil in the mercury mine area soil pollution control agent evenly, spread it on the surface, lay out the sprinkler irrigation network, and water it steadily; Step 2: Arrange mercury-resistant plants according to the "herb-shrub" combination, cover with a thin layer of soil and water after planting.

5. The method for treating contaminated soil in mining areas according to claim 4, characterized in that: In step 1, the surface soil refers to the soil within 20 cm of the surface.

6. The method for treating contaminated soil in mining areas according to claim 4, characterized in that: In the step 1, the watering stabilization time is 1-3 weeks.

7. The method for treating contaminated soil in mining areas according to claim 4, characterized in that: In the step 2, the method of configuring mercury-resistant plants according to the "grass-shrub" method is to sow herbaceous plants, such as ramie and centipede grass, on the flat topsoil; cover with a thin layer of soil and water; and then transplant shrubs such as big-leaf Buddleja and honeysuckle.

8. The method for treating contaminated soil in mining areas according to claim 7, characterized in that: In the step 2, the herbaceous plants are planted at a density of 100-150 plants / m 2 ; The shrub planting density is 1-2 plants / m 2 .

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