CN114275986A - In-situ remediation method for heavy metal polluted bottom mud in mining area watershed - Google Patents
In-situ remediation method for heavy metal polluted bottom mud in mining area watershed Download PDFInfo
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- CN114275986A CN114275986A CN202210023815.6A CN202210023815A CN114275986A CN 114275986 A CN114275986 A CN 114275986A CN 202210023815 A CN202210023815 A CN 202210023815A CN 114275986 A CN114275986 A CN 114275986A
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Abstract
The invention provides an in-situ remediation method of heavy metal pollution bottom mud in a mining area watershed, and relates to the technical field of heavy metal pollution treatment. An in-situ remediation method for heavy metal polluted bottom mud in a mining area watershed comprises the following steps: dividing the mining area into a slope area and a mining area; cutting slope in the slope area, removing slope broken stones, compacting the slope, nailing an anchor rod into the slope, hanging a metal net, spraying mixed matrix on the slope, spraying mixed seeds, covering soil on the slope, and finally spraying water on the slope to thoroughly pour the soil; leveling the soil around the ore flow area, paving a layer of geotextile on the leveled soil, paving broken stones on the geotextile, adding a repairing agent into the heavy metal polluted bottom mud in the ore flow area, uniformly mixing, paving the broken stones, covering a layer of soil, and planting greening plants; and throwing a first aquatic plant at the deep water position of the ore flow area, and throwing a second aquatic plant at the shallow water position of the ore flow area. The invention can treat the pollution of the mining area.
Description
Technical Field
The invention relates to the technical field of heavy metal pollution treatment, in particular to an in-situ remediation method for heavy metal pollution bottom mud in a mining area watershed.
Background
Currently, there are 4 types of methods for repairing bottom mud in polluted water, including ectopic fixation, ectopic treatment, in-situ fixation, and in-situ treatment. The ex-situ treatment or fixation is to carry out transport treatment after dredging the sediment, and the treatment method mainly comprises a physical method, a chemical method and a biological method. The ex-situ treatment methods have advantages, but have problems of large engineering quantity and high cost, are difficult to bear economically, and easily cause secondary pollution and the like. In-situ treatment or fixation is a substrate sludge contamination remediation technique that leaves the contaminated substrate sludge in situ, reduces the volume of the contaminated substrate sludge by physical, chemical, or biological means, reduces the amount of contaminants or reduces the solubility, toxicity, or mobility of the contaminants, and reduces the release of contaminants. Nowadays, the in-situ repair technology has received high attention from scholars, government departments and environmental protection enterprises at home and abroad.
Currently, there are 4 types of methods for repairing bottom mud in polluted water, including ectopic fixation, ectopic treatment, in-situ fixation, and in-situ treatment. The ex-situ treatment or fixation is to carry out transport treatment after dredging the sediment, and the treatment method mainly comprises a physical method, a chemical method and a biological method. The ex-situ treatment methods have advantages, but have problems of large engineering quantity and high cost, are difficult to accept economically, and easily cause secondary pollution and the like. In situ treatment or fixation is a sludge contamination remediation technique that leaves the contaminated sludge in place, reduces the volume of the contaminated sludge using physical, chemical, or biological methods, reduces the amount of contaminants or reduces the solubility, toxicity, or mobility of the contaminants, and reduces the release of contaminants. Nowadays, the in-situ repair technology has received high attention from scholars, government departments and environmental protection enterprises at home and abroad.
At present, the treatment of the heavy metal bottom mud is mainly focused on the heavy metal migration characteristic and the soil covering measure, however, the heavy metal content of the bottom mud is high, the treatment efficiency is poor and the time and the labor are wasted by simply adopting the soil covering measure or the heavy metal migration characteristic.
Disclosure of Invention
The invention aims to provide an in-situ remediation method for heavy metal polluted bottom mud in a mining basin, which has the advantage of good heavy metal treatment effect.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The embodiment of the application provides an in-situ remediation method for heavy metal polluted bottom mud in a mining area watershed, which comprises the following steps:
dividing the mining area into a slope area and a mining area;
cutting a slope in a slope area, removing slope broken stones, compacting the slope, nailing anchor rods into the slope, hanging a metal net, spraying mixed matrix on the slope, spraying mixed seeds, covering soil on the slope, and finally spraying water on the slope to thoroughly pour the soil;
leveling the soil around the ore flow area, paving a layer of geotextile on the leveled soil, paving broken stones on the geotextile, digging out heavy metal polluted bottom mud in the ore flow area, adding a repairing agent into the heavy metal polluted bottom mud in the ore flow area, uniformly mixing, paving the mixture on the broken stones, covering a layer of soil, and planting greening plants;
and throwing a first aquatic plant at the deep water position of the ore flow area, and throwing a second aquatic plant at the shallow water position of the ore flow area.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
according to the invention, slope cutting treatment is carried out on the slope surface, and plants are planted, so that the stability of the slope surface can be improved, the stability of a geological environment is improved, the environmental landform can be treated, the plants can firmly grab soil, and heavy metals in the soil can be enriched through the plants, so that the effect of soil remediation is achieved; the geotechnical cloth is paved on the land around the ore flow area, and then the ore flow area heavy metal pollution bottom mud is mixed with the repairing agent and then is placed on the geotechnical cloth, so that the mud can be repaired, the soil is prevented from being polluted again, the heavy metal is intensively treated, the pertinence is strong, and meanwhile, the greening plants are planted on the geotechnical cloth, and the greening plants can enrich the heavy metal in the soil, so that the effect of treating the heavy metal pollution is achieved; through throwing in first aquatic plant and second aquatic plant in the mining area, can rely on the purification performance of plant self to administer heavy metal pollution, this type of plant can promote the microorganism to breed in photosynthesis moreover for the ecosystem in mining area is more various, can synthesize and pollute the improvement to the mining area.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to specific examples.
The invention provides an in-situ remediation method of heavy metal polluted bottom mud in a mining area watershed, which comprises the following steps:
dividing the mining area into a slope area and a mining area;
cutting a slope in a slope area, removing slope broken stones, compacting the slope, nailing anchor rods into the slope, hanging a metal net, spraying mixed matrix on the slope, spraying mixed seeds, covering soil on the slope, and finally spraying water on the slope to thoroughly pour the soil;
leveling the soil around the ore flow area, paving a layer of geotextile on the leveled soil, paving broken stones on the geotextile, digging out heavy metal polluted bottom mud in the ore flow area, adding a repairing agent into the heavy metal polluted bottom mud in the ore flow area, uniformly mixing, paving the mixture on the broken stones, covering a layer of soil, and planting greening plants;
and throwing a first aquatic plant at the deep water position of the ore flow area, and throwing a second aquatic plant at the shallow water position of the ore flow area.
According to the invention, slope cutting treatment is carried out on the slope surface, and plants are planted, so that the stability of the slope surface can be improved, the stability of a geological environment is improved, the environmental landform can be treated, the plants can firmly grab soil, and heavy metals in the soil can be enriched through the plants, so that the effect of soil remediation is achieved; the geotechnical cloth is paved on the land around the ore flow area, and then the ore flow area heavy metal pollution bottom mud is mixed with the repairing agent and then is placed on the geotechnical cloth, so that the mud can be repaired, the soil is prevented from being polluted again, the heavy metal is intensively treated, the pertinence is strong, and meanwhile, the greening plants are planted on the geotechnical cloth, and the greening plants can enrich the heavy metal in the soil, so that the effect of treating the heavy metal pollution is achieved; through throwing in first aquatic plant and second aquatic plant in the mining area, can rely on the purification performance of plant self to administer heavy metal pollution, this type of plant can promote the microorganism to breed in photosynthesis moreover for the ecosystem in mining area is more various, can synthesize and pollute the improvement to the mining area.
In some embodiments of the present invention, the cutting angle is 27-30 °, the distance between the metal mesh and the slope is 7-10cm, the thickness of the mixed substrate is 8-13cm, and the seeding amount of the sprayed mixed seeds is 79-83g/m2And the thickness of the slope covering soil is 6-9 cm. The slope is cut at the angle, so that the phenomenon of landslide is not easy to occur, and the environment of a slope area is stabilized; the distance between the metal net and the slope surface is 7-10cm on one handThe slope area can be stabilized, and on the other hand, the plant can be conveniently grown, so that the slope area environment is stabilized; at 79-83g/m2Under the seeding rate, the full plant coverage of the sloping region can be ensured, and the waste of plants is avoided; through covering soil on the slope, an environment convenient for plant growth can be guaranteed to be provided for plant seeds.
In some embodiments of the present invention, the mixed seed comprises (2-4) by weight: 3, the woody plant seeds comprise at least two of cassia tora, sophora japonica, magnolia multiflora and vitex negundo; the herbaceous plant seeds comprise at least two of alfalfa, coreopsis tinctoria, aizoon stonecrop herb and coreopsis. Through planting woody and herbaceous plant seeds in a mixed mode, sustainable greening effect in the slope area can be guaranteed, and stabilizing effect on the slope area is good. The selected plant seeds can adapt to the mine environment, and the survival rate of the plants is further ensured.
In some embodiments of the present invention, the mixed matrix comprises (3-5) by weight: (1-3): (2-5): 2: 1: (0.2-0.8) planting soil, compound fertilizer, plant ash, peat, perlite and vinasse. The mixed matrix can provide sufficient nutrients for the growth of plant seeds, and is convenient for the germination and growth of plants.
In some embodiments of the invention, the crushed stone has a particle size of 20-40mm and a thickness of 8-15 cm. The tiny gravels can facilitate the growth of the plant root system.
In some embodiments of the invention, the adding amount of the repairing agent is 6-10% of the weight of the heavy metal polluted bottom mud in the mining area, the thickness of the soil paved on the gravels is 20-40cm, and the planting interval of the greening plants is 2-3 m. The added repairing agent can effectively adsorb heavy metals in plants so as to play a role in treating pollution, and the effect of treating heavy metal pollution is realized mainly through adsorption of heavy metal substances.
In some embodiments of the present invention, the above-described restorative agent is prepared by:
crushing the zeolite to 150-200 meshes, and drying to obtain zeolite powder;
mixing the following components in percentage by weight (2-4): 1, heating the walnut shells and the wheat straws for 150min in a nitrogen environment at 380 ℃ under 350-;
and mixing the zeolite powder and the mixed powder to prepare the repairing agent.
The zeolite powder and the mixed powder both have porous structures, the surfaces of the zeolite powder and the mixed powder contain a large amount of negative charges, so that the zeolite powder and the mixed powder have good ion exchange effect and adsorption effect on heavy metals, and mineral elements contained in the mixed powder can be combined with the heavy metals to generate precipitates, so that the heavy metals are converted from soluble to insoluble, the pH value of soil can be increased, the electronegativity of the soil surface is promoted, and the adsorption effect on metal cations is increased.
In some embodiments of the present invention, the greening plants are at least two of cherries, camellia, prunus persica, malus halliana and osmanthus fragrans. The plant can adapt to the environment of the mining area, and further purify the mining area.
In some embodiments of the invention, the first aquatic plant is at least two of tape grass, hornworts, water horse teeth, zostera marina, hydrilla verticillata, and aquaria.
In some embodiments of the invention, the second aquatic plant is at least two of Phragmites communis, Oenanthe stolonifera, Echinochloa crusgalli, Kalimeris indica, Typha orientalis, Cyprinus sajorana, Lythratus and Iris floribunda.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
An in-situ remediation method for heavy metal polluted bottom mud in a mining area watershed comprises the following steps:
dividing the mining area into a slope area and a mining area;
cutting slope in the slope area at 27 deg.C, removing slope broken stone, compacting the slope, nailing anchor rod into the slope, hanging metal net to ensure the interval between the metal net and the slope is 7cm, spraying mixed matrix (containing planting soil, compound fertilizer, plant ash, peat, perlite and distiller's grains) with thickness of 8cm on the slope, and mixing according to the weight ratio of 3: 1: 2: 2: 1: 0.279g/m2The sowing amount of the method is sprayed with mixed seeds (woody plant seeds and herbaceous plant seeds in a weight ratio of 2: 3, wherein the woody plant seeds comprise cassia occidentalis and sophora jutre, the herbaceous plant seeds comprise alfalfa and coreopsis, the slope is covered with soil with the thickness of 6cm, and finally water is sprayed on the slope to thoroughly irrigate the soil;
leveling the land around the ore flow area, paving a layer of geotextile on the leveled land, paving crushed stones with the thickness of 8cm and the particle size of 20mm on the geotextile, digging out the heavy metal polluted bottom mud in the ore flow area, adding a repairing agent which is 6 percent of the weight of the heavy metal polluted bottom mud in the ore flow area into the heavy metal polluted bottom mud in the ore flow area, uniformly mixing, paving the crushed stones, covering a layer of soil with the thickness of 20cm, and planting greening plants (cherries and camellia) at intervals of 2 m;
throwing first aquatic plants (eel grass and golden carp algae) at deep water positions of the ore flow area, and throwing second aquatic plants (reed and cress) at shallow water positions of the ore flow area.
The repairing agent is prepared by the following steps:
crushing zeolite to 150 meshes, and drying to obtain zeolite powder;
mixing the following components in percentage by weight: 1, mixing walnut shells and wheat straws, heating for 100min in a nitrogen environment at 350 ℃, and crushing to 100 meshes to obtain mixed powder;
and mixing the zeolite powder and the mixed powder to prepare the repairing agent.
Example 2
An in-situ remediation method for heavy metal polluted bottom mud in a mining area watershed comprises the following steps:
dividing the mining area into a slope area and a mining area;
cutting slope according to 28 degrees, removing slope broken stone, compacting the slope, nailing an anchor rod into the slope, hanging a metal net, ensuring that the metal net is 9cm away from the slope, spraying a mixed matrix (the mixed matrix comprises planting soil, compound fertilizer, plant ash, peat, perlite and vinasse in a weight ratio of 4: 2: 3: 2: 1: 0.5) with the thickness of 10cm on the slope, and then cutting the slope according to 81g/m2The seeding rate of (2) spraying mixed seeds (the mixed seeds comprise wood with the weight ratio of 3: 3)The woody plant seeds comprise magnolia multiflora and chaste tree twigs; the herbaceous plant seeds comprise aeolian agropyron and cosmos), then covering soil with the thickness of 8cm on the slope surface, and finally spraying water on the slope surface to thoroughly irrigate the soil;
leveling the land around the ore flow area, paving a layer of geotextile on the leveled land, paving broken stones with the thickness of 12cm and the particle size of 30mm on the geotextile, digging out the heavy metal polluted bottom mud in the ore flow area, adding a repairing agent accounting for 8 percent of the weight of the heavy metal polluted bottom mud in the ore flow area into the heavy metal polluted bottom mud in the ore flow area, uniformly mixing, paving the broken stones, covering a layer of soil with the thickness of 30cm, and planting greening plants (camellia, prunus persica and malus halliana) at intervals of 2.5 m;
throwing first aquatic plants (water horse teeth, zostera marina and hydrilla verticillata) at deep water positions of the ore flow area, and throwing second aquatic plants (barnyard grass, kalimeris, cattail, saxifrage and Qianfu vegetable) at shallow water positions of the ore flow area.
The repairing agent is prepared by the following steps:
crushing zeolite to 180 meshes, and drying to obtain zeolite powder;
mixing the components in a weight ratio of 3: 1, mixing walnut shells and wheat straws, heating for 120min in a nitrogen environment at 370 ℃, and crushing to 130 meshes to obtain mixed powder;
and mixing the zeolite powder and the mixed powder to prepare the repairing agent.
Example 3
An in-situ remediation method for heavy metal polluted bottom mud in a mining area watershed comprises the following steps:
dividing the mining area into a slope area and a mining area;
cutting slope in 29 deg., removing slope broken stone, compacting, nailing anchor rod into the slope, hanging metal net, ensuring the interval between the metal net and the slope is 9cm, spraying mixed matrix (containing planting soil, compound fertilizer, plant ash, peat, perlite and distiller's grains) with thickness of 13cm, and spraying the mixed matrix at a weight ratio of 4: 3: 5: 2: 1: 0.6 onto the slope, and spraying the mixed matrix at a weight ratio of 82g/m2The seeding rate of (2) spraying mixed seeds (the mixed seeds comprise woody plant seeds with the weight ratio of 4: 3And herbaceous plant seeds, the woody plant seeds comprise Cassia occidentalis and Vitex negundo; the herbaceous plant seeds comprise alfalfa, aifeng grass and cosmos), covering soil with the thickness of 8cm on the slope, and finally spraying water on the slope to thoroughly pour the soil;
leveling the land around the ore flow area, paving a layer of geotextile on the leveled land, paving crushed stones with the thickness of 15cm and the particle size of 35mm on the geotextile, digging out the heavy metal polluted bottom mud in the ore flow area, adding a repairing agent which is 9 percent of the weight of the heavy metal polluted bottom mud in the ore flow area into the heavy metal polluted bottom mud in the ore flow area, uniformly mixing, paving the crushed stones, covering a layer of soil with the thickness of 30cm, and planting greening plants (cherokee rose, camellia, purple-leaf peach and sweet osmanthus) at intervals of 3 m;
throwing first aquatic plants (grass, water horse teeth, zostera marina, hydrilla verticillata and aquaria) at deep water positions of the ore flow area, and throwing second aquatic plants (reed, kalimeris, cattail, saxifrage, loosestrife and yellow iris) at shallow water positions of the ore flow area.
The repairing agent is prepared by the following steps:
crushing zeolite to 180 meshes, and drying to obtain zeolite powder;
mixing the components in a weight ratio of 3: 1, mixing walnut shells and wheat straws, heating for 140min in a nitrogen environment at 370 ℃, and crushing to 150 meshes to obtain mixed powder;
and mixing the zeolite powder and the mixed powder to prepare the repairing agent.
Example 4
An in-situ remediation method for heavy metal polluted bottom mud in a mining area watershed comprises the following steps:
dividing the mining area into a slope area and a mining area;
cutting slope in slope area at 30 deg.C, removing slope broken stone, compacting the slope, nailing anchor rod into the slope, hanging metal net, ensuring the interval between the metal net and the slope to be 10cm, spraying mixed matrix (the mixed matrix comprises planting soil, compound fertilizer, plant ash, peat, perlite and distiller's grains) with thickness of 13cm, and spraying water at 83g/m2The seeding rate of (2) spraying the mixed seeds (the mixed seeds comprise heavy weight)The quantity ratio is 4: 3 woody plant seeds and herbaceous plant seeds, the woody plant seeds comprise cassia tora, sophora jutre, magnolia flowers and vitex negundo; the herbaceous plant seeds comprise alfalfa, coreopsis tinctoria, aizoon stonecrop and cosmos), soil with the thickness of 9cm is covered on the slope, and finally water is sprayed on the slope to thoroughly irrigate the soil;
leveling the land around the ore flow area, paving a layer of geotextile on the leveled land, paving crushed stones with the thickness of 15cm and the particle size of 40mm on the geotextile, digging out the heavy metal polluted bottom mud in the ore flow area, adding a repairing agent which is 10 percent of the weight of the heavy metal polluted bottom mud in the ore flow area into the heavy metal polluted bottom mud in the ore flow area, uniformly mixing, paving the crushed stones, covering a layer of soil with the thickness of 40cm, and planting greening plants (cherokee rose, camellia, prunus persica, malus halliana and sweet osmanthus) at intervals of 3 m;
throwing first aquatic plants (grass, hornwort, algae, black algae and cymbidium) at deep water positions of the ore flow area, and throwing second aquatic plants (reed, cress, barnyard grass, kalimeris, cattail, mullet, loosestrife and irish iris) at shallow water positions of the ore flow area.
The repairing agent is prepared by the following steps:
crushing zeolite to 200 meshes, and drying to obtain zeolite powder;
mixing the components in a weight ratio of 4: 1, mixing walnut shells and wheat straws, heating for 150min in a nitrogen environment at 380 ℃, and crushing to 150 meshes to obtain mixed powder;
and mixing the zeolite powder and the mixed powder to prepare the repairing agent.
Examples of the experiments
Heavy metal polluted bottom mud on the geotextile of a certain mining area watershed treated by the embodiment 2 is collected according to the technical guideline for site environment survey HJ25.1-2019, and then is analyzed according to the technical Specification for soil environment monitoring HJT1662004, and the analysis result is shown in Table 1.
TABLE 1
Analysis of table 1 shows that the heavy metals treated by the treatment are effectively removed, and the treatment effect on the environment of the mine area is good.
By observing the sloping area, the plants can flourish in the sloping area, and the ecological recovery condition is good; the greening plants around the ore flow area are observed, so that the growth state of the greening plants is good, the growth conditions of the aquatic plants in the ore flow area are good when the greening plants are observed, and the ecological restoration condition of the whole ore area is good.
In conclusion, the slope surface is subjected to slope cutting treatment and plants are planted, so that the stability of the slope surface can be improved, the stability of a geological environment is improved, the environmental landform can be treated, the plants can firmly grab soil and can enrich heavy metals in the soil through the plants, and the effect of repairing the soil is achieved; the geotechnical cloth is laid on the land around the mining flow area, and then the heavy metal pollution bottom mud in the mining flow area is mixed with the repairing agent and then placed on the geotechnical cloth, so that the soil can be prevented from being polluted again while the mud is repaired, the heavy metal can be intensively treated, the pertinence is strong, and meanwhile, green plants are planted on the geotechnical cloth, and the heavy metal in the enriched soil can be enriched through the green plants, so that the effect of treating the heavy metal pollution is achieved; through throwing in first aquatic plant and second aquatic plant in the mining area, can rely on the purification performance of plant self to administer heavy metal pollution, this type of plant can promote the microorganism to breed in photosynthesis moreover for the ecosystem in mining area is more various, can synthesize and pollute the improvement to the mining area.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (10)
1. An in-situ remediation method for heavy metal polluted bottom mud in a mining area basin is characterized by comprising the following steps:
dividing the mining area into a slope area and a mining area;
cutting slope in the slope area, removing slope broken stones, compacting the slope, nailing an anchor rod into the slope, hanging a metal net, spraying mixed matrix on the slope, spraying mixed seeds, covering soil on the slope, and finally spraying water on the slope to thoroughly pour the soil;
leveling the soil around the ore flow area, paving a layer of geotextile on the leveled soil, paving broken stones on the geotextile, digging out heavy metal polluted bottom mud in the ore flow area, adding a repairing agent into the heavy metal polluted bottom mud in the ore flow area, uniformly mixing, paving the mixture on the broken stones, covering a layer of soil, and planting greening plants;
and throwing a first aquatic plant at the deep water position of the ore flow area, and throwing a second aquatic plant at the shallow water position of the ore flow area.
2. The in-situ remediation method of heavy metal contaminated bottom mud of a mining area basin as claimed in claim 1, wherein the slope cutting angle is 27-30 °, the interval between the metal mesh and the slope surface is 7-10cm, the thickness of the mixed matrix is 8-13cm, and the seeding amount of the sprayed mixed seeds is 79-83g/m2And the thickness of the slope covering soil is 6-9 cm.
3. The in-situ remediation method for heavy metal contaminated sediment in a mining area basin according to claim 1, wherein the mixed seeds comprise the following components in a weight ratio of (2-4): 3, the woody plant seeds comprise at least two of cassia tora, sophora japonica, magnolia multiflora and vitex negundo; the herbaceous plant seeds comprise at least two of alfalfa, coreopsis tinctoria, aizoon stonecrop herb and cosmos.
4. The in-situ remediation method of heavy metal contaminated bottom mud of a mining area watershed, according to claim 1, wherein the mixed matrix comprises (3-5) by weight: (1-3): (2-5): 2: 1: (0.2-0.8) planting soil, compound fertilizer, plant ash, peat, perlite and vinasse.
5. The in-situ remediation method of heavy metal contaminated sediment in a mining area basin according to claim 1, wherein the crushed stone has a particle size of 20-40mm and a thickness of 8-15 cm.
6. The in-situ remediation method of heavy metal contaminated sediment in a mining basin according to claim 1, wherein the addition amount of the remediation agent is 6-10% of the weight of the heavy metal contaminated sediment in the mining basin, the soil laid on the crushed stones is 20-40cm thick, and the planting interval of the green plants is 2-3 m.
7. The in-situ remediation method of heavy metal contaminated sediment in a mining area basin according to claim 1, wherein the remediation agent is prepared by the following steps:
crushing the zeolite to 150-200 meshes, and drying to obtain zeolite powder;
mixing the following components in percentage by weight (2-4): 1, heating the walnut shells and the wheat straws for 150min in a nitrogen environment at 380 ℃ under 350-;
and mixing the zeolite powder and the mixed powder to prepare the repairing agent.
8. The in-situ remediation method of heavy metal contaminated bottom mud of a mining area basin as claimed in claim 1, wherein the green plants are at least two of cherries, camellia, prunus persica, malus halliana and osmanthus fragrans.
9. The method of claim 1, wherein the first aquatic plant is at least two of eel grass, hornwort, water horse teeth, zostera marina, hydrilla verticillata and aquamarine.
10. The method of claim 1, wherein the second aquatic plant is at least two of reed, cress, barnyard grass, kale, cattail, saxifrage, loosestrife and irish.
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