Method for repairing mine wasteland by using plant-microorganism synergistic activation of shield mud and sludge

Abstract

The application provides a method for repairing mine wasteland by synergistically activating shield slurry and sludge by plants and microorganisms, injecting ozone into domestic sludge to obtain modified sludge, uniformly mixing the modified sludge, the shield slurry, biological bacterial fertilizer and arbuscular mycorrhizal preparation at a dry weight ratio of (4-5):(1-2):(0.2-0.3):(0.2-0.3) to obtain mixed slurry, performing pressure filtration dewatering treatment on the mixed slurry, and controlling the water content to be 30-50% to obtain mixed dry material, adding tailing sand and pioneer grass seeds to the mixed dry material, irrigating and cultivating at room temperature for 7 days to obtain mixed plant sludge cake, crushing the mixed plant sludge cake to obtain ecological restoration soil, adding ecological curing agent to the ecological restoration soil to obtain cured restoration soil, adding grass seeds to the cured restoration soil to obtain modified restoration soil, adding grass seeds to the ecological restoration soil after laying the ecological restoration soil on the flat section of the mine wasteland, spraying and sowing the modified restoration soil on the slope section of the mine wasteland, repairing the mine wasteland by the ecological restoration soil and the modified restoration soil, and realizing ecological environment restoration succession cycle.

Description

Technical Field

[0001] This invention belongs to the field of mine ecological restoration technology, and specifically relates to a method for remediating abandoned mine sites by utilizing plant-microorganism synergistic activation of shield tunneling mud and sludge. Background Technology

[0002] The surface of abandoned mine sites contains large amounts of low-grade waste and strippings, and the original soil and surface vegetation systems are severely damaged, resulting in large areas of exposed soil and severe soil erosion. Furthermore, the waste material has poor cohesion and fertility, making it difficult to form an effective soil structure, and the natural recovery time for vegetation is long. A crucial aspect of mine ecological restoration is the reconstruction and improvement of mine soil. While chemical fertilizers can improve soil fertility to some extent, applying them alone cannot improve soil texture. Applying organic fertilizers can significantly improve soil quality, but the amount used is large and the cost is high. Sludge, on the other hand, contains a large amount of nutrients necessary for plant growth, and arbuscular mycorrhizal fungi can promote the absorption of soil nutrients by plants.

[0003] Therefore, how to provide a method for remediating mine wasteland by synergistic activation of shield tunneling mud and sludge using plants and arbuscular mycorrhizae, thereby releasing nutrients and promoting plant absorption, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a method for remediating abandoned mine sites by utilizing plant-microorganism synergistic activation of shield tunneling mud and sludge, so as to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, the first aspect of the present invention provides a method for remediating abandoned mining sites by synergistic activation of shield tunneling mud and sludge using plants and microorganisms. The method includes the following steps: S1, injecting ozone into domestic sewage sludge to react and obtain modified sludge; S2, mixing the modified sludge, shield tunneling mud, bio-fertilizer, and arbuscular mycorrhizal preparation at a dry weight ratio of (4-5):(1-2):(0.2-0.3):(0.2-0.3) to obtain a mixed mud; S3, subjecting the mixed mud to pressure filtration and dewatering treatment to obtain a mixed dried material with a moisture content of 30-50%; S4, adding... S5. Add tailings sand with a particle size of 0.5-2mm and pioneer grass seeds to the material, mix evenly, and cultivate at room temperature for 7 days to obtain mixed plant mud cake; S6. Crush the mixed plant mud cake to obtain ecological restoration soil; S7. Add ecological solidifying agent with a mass ratio of 5% to the ecological restoration soil, mix evenly to obtain solidified restoration soil, the moisture content of the solidified restoration soil is 60%; S8. Add grass seeds to the solidified restoration soil, mix evenly to obtain modified restoration soil; S9. After laying the ecological restoration soil on the flat section of the mine wasteland, add grass seeds, and spray the modified restoration soil on the slope section of the mine wasteland to restore the mine wasteland.

[0006] In the first aspect, in step S1, the ozone injection amount is 0.1-0.2 g / g, and the ozone intake rate is 1.8-2.0 L / min.

[0007] In the first aspect, in step S1, the reaction time is 20-30 min.

[0008] In the first aspect, in step S2, the bio-fertilizer is a freeze-dried powder made from nitrogen-fixing bacteria, potassium bacteria, phosphorus bacteria, and carbon-solubilizing bacteria extracted from activated sludge, wherein the ratio of the nitrogen-fixing bacteria, potassium bacteria, phosphorus bacteria, and carbon-solubilizing bacteria is (18-20):(8-10):(14-16):(6-10), and the effective viable count is ≥4×10⁻⁶. 9 CFU / g.

[0009] In the first aspect, in step S4, the amount of tailings sand added is 20-50% of the dry weight of the mixed dried material, and the amount of pioneer grass seeds added is 1-2% of the dry weight of the mixed dried material.

[0010] In the first aspect, in step S6, the eco-curing agent includes cement, silica fume, desulfurized gypsum, and electrolytic manganese slag.

[0011] In the first aspect, the mass ratio of the cement, the silica fume, the desulfurized gypsum, and the electrolytic manganese slag is 3:2:3:2.

[0012] In the first aspect, in step S7, the amount of grass seed added is 1-2% of the dry weight of the solidified remediation soil.

[0013] In the first aspect, in step S8, the thickness of the ecological restoration soil is 0.5-0.7m.

[0014] In the first aspect, in step S8, the spraying thickness of the modified remediation soil is 0.05-0.1m; the spraying method includes spraying once every other day, for a total of three sprayings.

[0015] Beneficial effects:

[0016] This invention provides a method for remediating mine wasteland using plant-microorganism synergistic activation of shield tunneling mud and sludge. First, ozone is injected into the domestic sewage sludge to degrade macromolecules, resulting in easily soluble modified sludge. The modified sludge, shield tunneling mud, bio-fertilizer, and arbuscular mycorrhizal preparation are then mixed uniformly at a dry weight ratio of (4-5):(1-2):(0.2-0.3):(0.2-0.3). The bio-fertilizer and arbuscular mycorrhizal preparation activate the modified sludge and shield tunneling mud, improving the performance of the mixed mud. Second, the mixed mud is dewatered by pressure filtration, controlling the moisture content to 30-50% to obtain a mixed dry material. Then, the mixed mud is further processed... Tailings sand and pioneer grass seeds were added to the mixed plant mud cake to enhance the water-air-heat transfer efficiency and biodiversity. The mixture was then irrigated and cultivated at room temperature for 7 days to create suitable conditions for plant growth. The mixed plant mud cake was then crushed to obtain ecological restoration soil with smaller particle size, which was then mixed evenly with the ecological solidifying agent to obtain solidified restoration soil with better performance. Grass seeds were added to the solidified restoration soil to further improve the biodiversity in the soil and create favorable conditions for soil remediation. Finally, the ecological restoration soil with smaller particle size was laid on the flat areas of the mine wasteland, and the viscous modified restoration soil was sprayed on the slopes of the mine wasteland, combined with grass seeds to achieve ecological environment restoration succession cycle. This invention utilizes the synergistic effect of a root-based life community formed by bio-fertilizers, arbuscular mycorrhizal fungi, and the root system of Pioneer grass species to activate shield tunneling mud and modified sludge, thereby releasing organic mineral elements in the modified sludge and promoting plant absorption of nutrients. By using sand-grade solid waste from the mine on-site, the permeability coefficient of the soil is increased, enhancing the water-air-heat transfer in the soil. Thus, the obtained ecological restoration soil and modified restoration soil are used to cover and restore abandoned mining areas, laying the foundation for ecological environment restoration.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart of a method for remediating abandoned mine sites by utilizing plant-microorganism synergistic activation of shield tunneling mud and sludge, as described in this invention. Detailed Implementation

[0020] The present invention will be described in detail below with reference to specific embodiments and examples, thereby making the advantages and various effects of the present invention more clearly apparent. Those skilled in the art should understand that these specific embodiments and examples are for illustrative purposes only and are not intended to limit the present invention.

[0021] Throughout this specification, unless otherwise specified, the terminology used herein should be understood as having the meaning commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In the event of any conflict, this specification shall prevail.

[0022] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be obtained by purchasing them from the market or by existing methods.

[0023] Please see Figure 1This invention provides a method for remediating abandoned mining sites using plant-microorganism synergistic activation of shield tunneling mud and sludge. The method includes the following steps: S1, injecting ozone into domestic sludge to react and obtain modified sludge; S2, mixing the modified sludge, shield tunneling mud, bio-fertilizer, and arbuscular mycorrhizal preparation at a dry weight ratio of (4-5):(1-2):(0.2-0.3):(0.2-0.3) to obtain a mixed mud; S3, subjecting the mixed mud to pressure filtration and dewatering treatment to obtain a mixed dried material with a moisture content of 30-50%; S4, adding... Add tailings sand with a particle size of 0.5-2mm and pioneer grass seeds, mix evenly, and cultivate at room temperature for 7 days to obtain mixed plant mud cake; S5, crush the mixed plant mud cake to obtain ecological restoration soil; S6, add ecological solidifying agent with a mass ratio of 5% to the ecological restoration soil, mix evenly to obtain solidified restoration soil, the moisture content of the solidified restoration soil is 60%; S7, add grass seeds to the solidified restoration soil, mix evenly to obtain modified restoration soil; S8, after laying the ecological restoration soil in the flat area of ​​the mine wasteland, add grass seeds, and spray modified restoration soil on the mine slope to restore the mine wasteland.

[0024] Specifically, this invention provides a method for remediating abandoned mine sites using plant-microorganism synergistic activation of tunnel boring machine (TBM) slurry and sludge. First, ozone is injected into the domestic sewage sludge to degrade macromolecules, resulting in easily soluble modified sludge. The modified sludge, TBM slurry, bio-fertilizer, and arbuscular mycorrhizal preparation are then mixed uniformly at a dry weight ratio of (4-5):(1-2):(0.2-0.3):(0.2-0.3). The bio-fertilizer and arbuscular mycorrhizal preparation activate the modified sludge and TBM slurry, improving the performance of the mixed slurry. Second, the mixed slurry is dewatered by pressure filtration, controlling the moisture content to 30-50% to obtain a mixed dry material. Then… Tailings sand and pioneer grass seeds were added to the mixed dried material to enhance the water-air-heat transfer efficiency and biodiversity of the mixed plant mud cake. The mixture was then irrigated and cultivated at room temperature for 7 days to create suitable conditions for plant growth. The mixed plant mud cake was then crushed to obtain ecological restoration soil with smaller particle size, which was then mixed evenly with the ecological solidifying agent to obtain solidified restoration soil with better performance. Grass seeds were added to the solidified restoration soil to further improve the biodiversity in the soil and create favorable conditions for soil remediation. Finally, the ecological restoration soil with smaller particle size was laid on the flat areas of the mine wasteland, and the viscous modified restoration soil was sprayed on the slopes of the mine wasteland. Combined with grass seeds, the ecological environment restoration succession cycle was realized. This invention utilizes the synergistic effect of a root-based life community formed by bio-fertilizers, arbuscular mycorrhizal fungi, and the root system of pioneer grass species to activate shield tunneling mud and modified sludge, thereby releasing organic mineral elements in the modified sludge and promoting plant absorption of nutrients. By using sand-grade solid waste (tailings sand) from the mine on-site, the permeability coefficient of the soil is increased, enhancing the water-air-heat transfer in the soil. Thus, the obtained ecological restoration soil and modified restoration soil are used to cover and restore abandoned mining areas, laying the foundation for ecological environment restoration.

[0025] It should be added that the shield tunneling mud can come from engineering waste mud obtained by means of continuous wall excavation, shield machine tunneling or pile foundation excavation; sludge can come from the primary sedimentation sludge or residual sludge of domestic sewage sludge or water supply sludge. In addition, modified sludge can be obtained by ozone treatment of domestic sewage sludge or from silt mud in rivers and lakes; mine waste sites can be abandoned exposed mine pits, tailings ponds, gangue dumps or solid waste backfill areas where topsoil is lacking.

[0026] In some possible embodiments, in step S1, the ozone injection amount is 0.1-0.2 g / g, and the ozone intake rate is 1.8-2.0 L / min.

[0027] In some possible embodiments, the reaction time in step S1 is 20-30 minutes.

[0028] Those skilled in the art will understand that by injecting ozone into sewage sludge, some organic pollutants and pathogens can be degraded, reducing the harm caused by organic pollutants and pathogens, and releasing organic matter and elements such as nitrogen, phosphorus, and potassium required for plant growth, thereby improving the activity of modified sludge, absorbing a large amount of sludge, and realizing the resource utilization of waste.

[0029] In some possible embodiments, in step S2, the bio-fertilizer is a freeze-dried powder made from nitrogen-fixing bacteria, potassium bacteria, phosphorus bacteria, and carbon-solubilizing bacteria extracted from activated sludge, wherein the ratio of the nitrogen-fixing bacteria, potassium bacteria, phosphorus bacteria, and carbon-solubilizing bacteria is (18-20):(8-10):(14-16):(6-10), and the effective viable count is ≥4×10⁻⁶. 9 CFU / g.

[0030] This is because bio-fertilizers can not only release organic elements from modified sludge, but also release organic minerals from the subsequently added tailings sand, and combine with arbuscular mycorrhizal fungi to promote the absorption of nutrients from the soil by plants.

[0031] In some possible embodiments, in step S4, the amount of tailings sand added is 20-50% of the dry weight of the mixed dried material, and the amount of pioneer grass seeds added is 1-2% of the dry weight of the mixed dried material.

[0032] Those skilled in the art will understand that adding tailings sand to the mixed dried material can increase the porosity and permeability coefficient of the mixed dried material, increase the proportion of aggregates larger than 0.25 mm in the mixed dried material, and provide a site for water-air-heat transport for plant growth. Pioneer grass seeds can survive in unfavorable environments such as resource scarcity and poor soil conditions, and have strong reproductive capacity and growth rate. This enriches the biodiversity of the mixed plant mud cake after 7 days of irrigation and cultivation, improves the soil structure, and, combined with bio-fertilizer and arbuscular mycorrhizal fungi, accelerates the soil formation speed of the mixed plant mud cake, further enhancing the soil's nutrient content.

[0033] In some possible embodiments, in step S6, the eco-curing agent includes cement, silica fume, desulfurized gypsum, and electrolytic manganese slag.

[0034] In some possible embodiments, the mass ratio of the cement, the silica fume, the desulfurized gypsum, and the electrolytic manganese slag is 3:2:3:2.

[0035] Furthermore, adding an ecological solidifying agent composed of cement, silica fume, desulfurized gypsum, and electrolytic manganese slag to the ecological restoration soil can improve its performance, giving the prepared solidified restoration soil higher soil strength and permeability, thereby creating a suitable growing environment for plants. In addition, the prepared solidified restoration soil can also be used to restore abandoned slopes and plant trees on the slopes to prevent landslides.

[0036] In some possible embodiments, in step S7, the amount of grass seed added is 1-2% of the dry weight of the solidified remediation soil.

[0037] Those skilled in the art will understand that adding grass seeds to solidified remediation soil can further enhance biodiversity, rapidly enter a virtuous cycle of ecological succession, and lay the foundation for improving the soil conditions of the area to be remediated.

[0038] In some possible embodiments, in step S8, the thickness of the ecological restoration soil is 0.5-0.7m.

[0039] In some possible embodiments, in step S8, the spraying thickness of the modified remediation soil is 0.05-0.1m; the spraying method includes spraying once every other day, for a total of three sprayings.

[0040] The present application is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the application. Experimental methods in the following embodiments that do not specify specific conditions are generally determined according to national standards. If there is no corresponding national standard, then general international standards, conventional conditions, or conditions recommended by the manufacturer are followed.

[0041] Example

[0042] This embodiment focuses on the repair of a lead-zinc tailings dam. The selected domestic sewage sludge is derived from the primary sedimentation sludge of domestic sewage sludge, and the shield tunneling mud is the waste mud generated during the shield tunneling process. The specific repair steps are as follows:

[0043] (1) Ozone micro-nano bubbles were injected into the domestic sludge through a micro-nano bubble generator. The ozone injection amount was 0.2 g / g, the air intake was 1.8 L / min, and the reaction was carried out for 20 min to obtain modified sludge.

[0044] (2) The modified sludge, shield tunneling mud, bio-fertilizer, and arbuscular mycorrhizal preparation are mixed evenly at a dry weight ratio of 5:1:0.2:0.2 to obtain a mixed mud; wherein, the bio-fertilizer is a freeze-dried powder formed by nitrogen-fixing bacteria, potassium bacteria, phosphorus bacteria, and carbon-solubilizing bacteria in a mass ratio of 20:10:15:6, with an effective viable count ≥4×10 9 CFU / g;

[0045] (3) The mixed mud is dewatered by pressure filtration until the moisture content is 40% to obtain the mixed dried material;

[0046] (4) Add tailings sand with a particle size of 0.5-2 mm and Pioneer grass seeds to the mixed dried material, mix evenly, and cultivate at room temperature for 7 days to obtain mixed plant mud cake; wherein, the amount of tailings sand added is 50% of the dry weight of the mixed dried material, and the amount of Pioneer grass seeds added is 2% of the dry weight of the mixed dried material;

[0047] (5) The mixed plant mud cake is crushed to obtain ecological restoration soil;

[0048] (6) Add 5% by mass of ecological solidifying agent to the ecological restoration soil, mix evenly, and add water to obtain solidified restoration soil with a moisture content of 60%; wherein, the ecological solidifying agent is prepared by cement, silica fume, desulfurized gypsum and electrolytic manganese slag in a mass ratio of 3:2:3:2.

[0049] (7) Add grass seeds to the solidified remediation soil and mix evenly to obtain modified remediation soil; wherein, the amount of grass seeds added is 1% of the dry weight of the solidified remediation soil;

[0050] (8) Lay a 0.5m thick layer of ecological restoration soil and add grass seeds on the flat section of the lead-zinc tailings dam, and spray a 0.1m thick layer of modified restoration soil on the slope section of the lead-zinc tailings dam. Spray the soil once every other day for a total of three times to restore the lead-zinc tailings dam.

[0051] Experiments have shown that the vegetation coverage of the repaired lead-zinc tailings dam in this embodiment can reach 89%.

[0052] Comparative Example 1

[0053] In this comparative example, no modified sludge was added to the mixed slurry, and the remaining steps were the same as in the example. Tests showed that the vegetation coverage of the repaired lead-zinc tailings dam in this comparative example was 69%.

[0054] Comparative Example 2

[0055] In this comparative example, no bio-fertilizer or arbuscular mycorrhizal preparation was added to the mixed mud; the remaining steps were the same as in the previous example. Experiments showed that the vegetation coverage rate of the repaired lead-zinc tailings dam in this comparative example was 72%.

[0056] Comparative Example 3

[0057] In this comparative example, no tailings sand (0.5-2 mm) was added to the mixed plant mud cake; the remaining steps were the same as in the example. Testing showed that the agglomerates (greater than 0.25 mm) in the mixed plant mud cake of this comparative example were reduced by 52% and the porosity by 22% compared to the examples.

[0058] Comparative Example 4

[0059] In this comparative example, no pioneer grass seeds were added to the mixed plant mud cake; the remaining steps were the same as in the previous example. Experiments showed that the vegetation coverage of the repaired lead-zinc tailings dam in this comparative example was 77%.

[0060] In summary, compared with the prior art, the present invention has the following advantages:

[0061] (1) This invention activates shield tunneling mud and sludge through the synergistic action of plants and microorganisms (arbuscular mycorrhizae and bio-fertilizers), accelerates the soil formation rate, and increases biodiversity under the growth drive of pioneer grass species, promotes the development of arbuscular mycorrhizae, and promotes the formation of aggregates in the soil under the joint action of plant roots and arbuscular mycorrhizae, thereby increasing the permeability of the soil to adapt to plant growth.

[0062] (2) This invention modifies waste shield tunneling mud and sludge to obtain nutrient-rich ecological restoration soil and modified restoration soil, and uses ecological restoration soil and modified restoration soil to restore abandoned mine sites, solving the problem of lack of topsoil in mining areas and providing a guarantee for the subsequent ecological restoration of mines.

[0063] Finally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0064] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0065] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for remediating abandoned mining sites by utilizing plant-microorganism synergistic activation of shield tunneling mud and sludge, characterized in that, The method includes the following steps: S1. Inject ozone into the sewage sludge to carry out the reaction and obtain modified sludge; S2. The modified sludge, shield tunneling mud, bio-fertilizer and arbuscular mycorrhizal preparation are mixed evenly at a dry weight ratio of (4-5):(1-2):(0.2-0.3):(0.2-0.3) to obtain a mixed mud. S3. The mixed slurry is subjected to pressure filtration and dewatering treatment to obtain a mixed dried material with a moisture content of 30-50%. S4. Add tailings sand and Pioneer grass seeds with a particle size of 0.5-2mm to the mixed dried material, mix evenly, and cultivate at room temperature for 7 days to obtain mixed plant mud cake; S5. The mixed plant mud cake is crushed to obtain ecological restoration soil; S6. Add 5% by mass of ecological solidifying agent to the ecological restoration soil, mix evenly to obtain solidified restoration soil, wherein the moisture content of the solidified restoration soil is 60%; S7. Add grass seeds to the solidified repair soil, mix evenly, and obtain modified repair soil; S8. After laying the ecological restoration soil on the flat section of the abandoned mine site, add grass seeds; spray the modified restoration soil on the slope section of the abandoned mine site to restore the abandoned mine site.

2. The method for remediating abandoned mine sites by utilizing plant-microorganism synergistic activation of shield tunneling mud and sludge according to claim 1, characterized in that, In step S1, the ozone injection rate is 0.1-0.2 g / g, and the ozone intake rate is 1.8-2.0 L / min.

3. The method for remediating abandoned mine sites by utilizing plant-microorganism synergistic activation of shield tunneling mud and sludge according to claim 1, characterized in that, In step S1, the reaction time is 20-30 minutes.

4. The method for remediating abandoned mine sites by utilizing plant-microorganism synergistic activation of shield tunneling mud and sludge according to claim 1, characterized in that, In step S2, the bio-fertilizer is a freeze-dried powder made from nitrogen-fixing bacteria, potassium bacteria, phosphorus bacteria, and carbon-solubilizing bacteria extracted from activated sludge. The ratio of the nitrogen-fixing bacteria, potassium bacteria, phosphorus bacteria, and carbon-solubilizing bacteria is (18-20):(8-10):(14-16):(6-10), and the effective viable count is ≥4×10⁻⁶. 9 CFU / g.

5. The method for remediating abandoned mine sites by utilizing plant-microorganism synergistic activation of shield tunneling mud and sludge according to claim 1, characterized in that, In step S4, the amount of tailings sand added is 20-50% of the dry weight of the mixed dried material, and the amount of pioneer grass seeds added is 1-2% of the dry weight of the mixed dried material.

6. The method for remediating abandoned mine sites by utilizing plant-microorganism synergistic activation of shield tunneling mud and sludge according to claim 1, characterized in that, In step S6, the ecological curing agent includes cement, silica fume, desulfurized gypsum, and electrolytic manganese slag.

7. The method for remediating abandoned mine sites by utilizing plant-microorganism synergistic activation of shield tunneling mud and sludge according to claim 6, characterized in that, The mass ratio of the cement, silica fume, desulfurized gypsum, and electrolytic manganese slag is 3:2:3:

2.

8. The method for remediating abandoned mine sites by utilizing plant-microorganism synergistic activation of shield tunneling mud and sludge according to claim 1, characterized in that, In step S7, the amount of grass seed added is 1-2% of the dry weight of the solidified remediation soil.

9. The method for remediating abandoned mine sites by utilizing plant-microorganism synergistic activation of shield tunneling mud and sludge according to claim 1, characterized in that, In step S8, the thickness of the ecological restoration soil is 0.5-0.7m.

10. The method for remediating abandoned mine sites by utilizing plant-microorganism synergistic activation of shield tunneling mud and sludge according to claim 1, characterized in that, In step S8, the spraying thickness of the modified remediation soil is 0.05-0.1m; the spraying method includes spraying once every other day, for a total of three sprayings.

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