CN110014032B - Farmland soil heavy metal pollution remediation method - Google Patents
Farmland soil heavy metal pollution remediation method Download PDFInfo
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- CN110014032B CN110014032B CN201910351179.8A CN201910351179A CN110014032B CN 110014032 B CN110014032 B CN 110014032B CN 201910351179 A CN201910351179 A CN 201910351179A CN 110014032 B CN110014032 B CN 110014032B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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Abstract
The invention belongs to the technical field of soil protection, and particularly relates to a method for restoring heavy metal pollution of farmland soil. The method comprises the steps of uniformly mixing a heavy metal passivator with soil, planting a first crop after maintenance, planting a super-enriched plant, applying a heavy metal activator, applying a passivator, applying a heavy metal passivator after planting a second crop, effectively reducing heavy metal leaching risk, avoiding heavy metal from being enriched in the crop, applying a heavy metal activator, planting the super-enriched plant, absorbing the heavy metal, reducing the content of the heavy metal in the soil, and keeping the heavy metal in the soil in the range not covered by a plant root system low in leaching risk due to the presence of the heavy metal passivator. The invention adopts the plant enrichment technology and the method of applying the heavy metal passivator, which not only can fundamentally remove the problem of heavy metal, but also can passivate the heavy metal when planting crops, thereby improving the use efficiency of soil.
Description
Technical Field
The invention belongs to the technical field of soil protection, and particularly relates to a method for restoring heavy metal pollution of farmland soil.
Background
Soil is an important material foundation for human survival, but as the industrialization and urbanization progress is deepened continuously, the heavy metal emission is increased continuously, so that the soil pollution is serious day by day. The national soil pollution condition survey results show that the number of inorganic pollutants exceeds 82.8% of the total number of the points, the main substances causing the inorganic pollution are cadmium (7.0%), nickel (4.8%), arsenic (2.7%), copper (2.1%), mercury (1.6%), lead (1.5%), chromium (1.1%) and zinc (0.9%), and lead is discharged by 500 million tons, copper is 340 million tons, mercury is 1.5 million tons, manganese is 1500 million tons and nickel is 100 million tons every year in the whole world, and the pollution is still increased continuously. The soil of the heavy metal superscalar cultivated land in China accounts for 19.4% of the total cultivated land soil area, the total area is 2500 hectare, and most heavy metal composite pollution is multiple heavy metal composite pollution, wherein the proportion of slight, mild, moderate and severe pollution point positions is respectively 13.7%, 2.8%, 1.8% and 1.1%, direct economic loss such as yield reduction exceeds 100 hundred million yuan, and the amount of heavy metal polluted grain reaches 1200 million tons every year, and the heavy metal polluted grain can be transferred into human bodies through the enrichment of a food chain layer, so that the human health is seriously influenced.
The heavy metals in soil are various in types, different in properties and difficult to treat and recover, and the method becomes a worldwide problem. In order to realize sustainable development and improve human life, the effective removal of heavy metals in soil is a very urgent task at present. The existing remediation method of the heavy metal contaminated soil mainly comprises engineering treatment remediation, physical and chemical remediation, chemical remediation and biological remediation; the solidification and stabilization technology in the physical and chemical remediation and the plant super-enrichment technology in the biological remediation are both remediation methods with excellent effects, successful implementation cases are provided at home and abroad, but the two methods have respective disadvantages and are mutually contradictory, the solidification and stabilization technology can reduce the physical and chemical activity of the heavy metal or change the structure of a heavy metal compound by adsorbing the heavy metal, and the heavy metal is not easily absorbed by plants and microorganisms, so that the pollution risk of the heavy metal is reduced, but the heavy metal is not really removed, and the risk of environmental pollution still exists; the plant hyper-enrichment technology achieves the purpose of removing heavy metals by enriching heavy metals in soil to the roots of plants and harvesting the plants, but the heavy metal compound structure is required to be easily absorbed and utilized by the plants, and the growth condition of the plants greatly influences the removal effect. Common hyper-enrichment plants comprise vetiver grass, bidens pinnata, golden silk grass and the like, but the common crops are all common crops, and large-area planting for removing soil heavy metals can affect normal farmland cultivation to cause grain yield reduction. Therefore, the method has important significance for searching the restoration technology which does not influence the farmland cultivation and can fundamentally remove the heavy metals.
Chinese patent document CN201310476035 discloses a method for restoring heavy metal pollution in farmland soil by coupling activation and passivation, which comprises applying a heavy metal activator to the soil, harvesting plants enriched with heavy metals to reduce the concentration of the heavy metals in the farmland soil, planting and harvesting crops with the heavy metal content reaching the standard safely, and putting the farmland into use as early as possible, but the method comprises applying the heavy metal activator to plant hyper-enriched plants and applying a heavy metal deactivator, when planting the hyper-enriched plants, the activity of the heavy metals in the partial soil without planting the hyper-enriched plants is still higher, higher leaching risk exists, the deactivators selected in the method mainly comprise phosphate, organic fertilizer and metal minerals, the phosphate and the heavy metals are chemically combined, and the combined substances have higher stability and are not easy to be activated again, the heavy metal content in the soil is increased; heavy metals can be introduced into the organic fertilizer and the metal minerals for the second time, and a certain amount of sulfate radicals are introduced at the same time, so that the organic fertilizer and the metal minerals are not utilized for the growth of crops; in addition, in this patent, the plant enrichment technique occupies the farmland, affects the farming, and reduces the use efficiency of the soil.
Disclosure of Invention
Therefore, the invention aims to overcome the defects that heavy metals have higher leaching risk, the use efficiency of soil is reduced by planting enrichment plants and the like in the remediation method in the prior art, thereby providing a comprehensive remediation method for heavy metal pollution of farmland soil.
Therefore, the invention provides the following technical scheme.
The invention provides a method for remedying heavy metal pollution of farmland soil, which comprises the following steps,
before planting crops, uniformly mixing the heavy metal passivator and soil by turning 10-30cm, and maintaining for 12-17 days;
planting a first crop in a spring stubble period, planting a super-enriched plant after the first crop is harvested, and applying a heavy metal activating agent;
harvesting hyperaccumulator plants before autumn and winter stubbles, then applying a heavy metal passivator, ploughing by 10-30cm, uniformly mixing, and maintaining for 12-17 days;
in the autumn and winter stubble period, planting a second crop, and after harvesting the second crop, planting a hyper-enrichment plant and simultaneously applying a heavy metal activator or performing fallow till the next spring stubble period;
wherein the hyper-enriched plant comprises vetiver, castor-oil plant, Sedum alfredii Hance, Solanum nigrum L, Lonicera japonica Thunb or Stenoloma chusana L; the first crop comprises wheat, broad bean, corn or soybean; the second crop comprises corn, soybean, sweet potato, millet, peanut or tobacco.
The spring stubble period is 4-7 months; the autumn and winter stubbles are 9-12 months.
The passivating agent is at least one of modified vermiculite, modified biochar and modified sepiolite;
the modification method of the vermiculite comprises the steps of uniformly mixing the vermiculite and an acid solution according to a solid-to-liquid ratio of 1:10, placing the mixture under a constant temperature condition, shaking for 1-2 hours, centrifugally separating the vermiculite from the acid, adding deionized water into the separated vermiculite, repeatedly washing and centrifuging, and drying to obtain the modified vermiculite; the concentration of the acid solution is 0.01-0.02 mol/L; the constant temperature is 70-90 ℃;
the method for modifying the biochar comprises the steps of preparing a biochar precursor by plant straws under the closed condition of 400-450 ℃, crushing the biochar precursor, uniformly mixing the crushed biochar precursor with a ferric chloride solution, drying the mixture by distillation in a water bath at the temperature of 75-95 ℃, pyrolyzing the mixture for 25-35min under the closed condition of 400-450 ℃, and cooling the mixture to room temperature to obtain the modified biochar; wherein the mass ratio of the biochar precursor to the iron element in the ferric chloride solution is (18-22) to 1;
the sepiolite modification method comprises the steps of uniformly mixing sepiolite and an acid solution according to a solid-to-liquid ratio of 1:10, placing the mixture under a constant temperature condition for shaking for 6-8 hours, carrying out centrifugal treatment, separating acid from sepiolite, adding deionized water into the separated sepiolite, repeatedly washing and centrifuging until the pH value is 6, and drying to obtain the modified sepiolite; the concentration of the acid solution is 0.8-1.2 mol/L; the constant temperature is 75-85 ℃.
The dosage of the heavy metal passivator is 50-150 kg/mu.
The activating agent comprises humic acid, polyaspartic acid, polyglutamic acid, itaconic acid, sorbitol, citric acid, a microbial agent and a root promoting agent; the microbial agent comprises at least one of bacillus subtilis, trichoderma viride, bacillus licheniformis, urease bacillus, saccharomycetes and pseudomonas; the root growth promoter comprises at least one of iminodisuccinic acid, [9, 9-di (2-ethylhexyl) -9H-fluorene-2, 7-diyl ] diboronic acid and 4-nitrophenyl-beta-D-cellobioside.
Further, the activator comprises, by mass, 20-25% of humic acid, 15-20% of polyaspartic acid, 15-20% of polyglutamic acid, 15-20% of itaconic acid, 8-10% of sorbitol, 8-10% of citric acid, 3-5% of a microbial agent and 0.5-2% of a root promoting agent.
The preparation method of the activating agent comprises the steps of drying and grinding 25% of humic acid, 20% of polyaspartic acid, 15% of polyglutamic acid, 20% of itaconic acid, 8% of sorbitol and 8% of citric acid, sieving to remove impurities, dissolving in water, adding 0.5% of a root promoting agent, uniformly mixing and dispersing, and adding 3.5% of a microbial agent after spray drying to prepare the powdery heavy metal activating agent.
The dosage of the activator is 3-10 kg/mu.
The technical scheme of the invention has the following advantages:
1. the method for restoring the heavy metal pollution of the farmland soil, provided by the invention, adopts the heavy metal passivator to be uniformly mixed with the soil, plants a first crop after maintenance, then plants a super-enriched plant, applies a heavy metal activator at the same time, then applies a passivator, and after a second crop is planted, the heavy metal passivator is applied first, so that the heavy metal leaching risk can be effectively reduced, meanwhile, the heavy metal is prevented from being enriched in the crop, then the heavy metal activator is applied, the super-enriched plant is planted, the heavy metal is absorbed, the content of the heavy metal in the soil is reduced, and the heavy metal in the soil in the range not covered by the plant root system keeps low leaching risk due to the existence of the heavy metal passivator; in addition, the method makes up the problem that the farmland land is occupied by the plant enrichment technology and the farming is influenced by selecting the crops and the hyper-enriched plants, so that the farmland can be normally tilled; the invention adopts the plant enrichment technology and the method of applying the heavy metal passivator, which not only can fundamentally remove the problem of heavy metal, but also can passivate the heavy metal when planting crops, thereby improving the use efficiency of soil.
2. According to the method for restoring the heavy metal pollution of the farmland soil, the adopted passivator is mainly used for passivating the heavy metal by a physical adsorption method, the adopted activating agent is mostly processing waste or is produced from the waste, the source is wide, the value is low, the heavy metal can be chelated, the solubility of the heavy metal is improved, the microbial activity of the soil can be improved after the soil is applied, the soil fertility is improved, and the growth of hyper-enriched plants is promoted. In addition, the overall activation effect of the activator is stronger than the passivation effect of the passivator, when crops are planted, heavy metals are passivated, the adsorption of the crops to the heavy metals is reduced, and when super-enriched plants are planted after the passivation is finished, the passivated heavy metals can be activated by the activator, so that the activated heavy metals are adsorbed by the super-enriched plants, the content of the heavy metals in farmland soil is reduced, and the use efficiency of the soil is improved;
the main component of the passivator is a modified adsorption material, the passivation effect on heavy metals comprises two passivation effects of physical and chemical, wherein the physical adsorption process is more broad-spectrum, and the passivator can adsorb anions, cations and moisture in soil while adsorbing heavy metal ions, thereby playing the roles of water retention, fertilizer retention and salt and alkali resistance; the chemical passivation process has stronger selectivity, has an obligate combination effect on various heavy metals, and can stably passivate heavy metal ions for a long time.
3. According to the method for restoring the heavy metal pollution of the farmland soil, the main components of humic acid, polyaspartic acid and polyglutamic acid of the activating agent are neutral or weakly alkaline mixtures, the acidity of itaconic acid, sorbitol and citric acid can be neutralized, the activating agent is wholly neutral, the soil cannot be acidified after the activating agent is applied, and the microbial agent and the root promoting agent in the activating agent are used for strengthening the activation effect of the heavy metal, promoting the growth of the root system of the hyper-enriched plant and enhancing the absorption of the hyper-enriched plant to the heavy metal.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
The preparation of the activators used in the following examples and comparative examples comprises: drying 25% of humic acid, 20% of polyaspartic acid, 15% of polyglutamic acid, 20% of itaconic acid, 8% of sorbitol and 8% of citric acid, grinding, sieving to remove impurities, dissolving with water, adding 0.5% of iminodisuccinic acid, uniformly mixing and dispersing, spray drying, and adding 3.5% of bacillus subtilis to prepare the powdery heavy metal activator.
The modification method of the passivates used in the following examples and comparative examples is as follows:
the modification method of the vermiculite comprises the steps of uniformly mixing the vermiculite and 0.01mol/L hydrochloric acid according to a solid-liquid ratio of 1:10, placing the mixture at 80 ℃ for shaking for 1h, centrifugally separating the hydrochloric acid from the vermiculite, adding deionized water into the separated vermiculite, repeatedly washing and centrifuging for 3 times, drying, crushing and sieving by a 100-mesh sieve to obtain the modified vermiculite;
the method for modifying the biochar comprises the steps of carrying out closed treatment on corn straws at 400 ℃ to obtain a biochar precursor, uniformly mixing the biochar precursor with an iron chloride solution (the mass ratio of the biochar precursor to iron in the iron chloride solution is 20:1), drying by distillation in a water bath at 80 ℃, carrying out pyrolysis for 30min under the closed condition at 400 ℃, and naturally cooling to room temperature to obtain the modified biochar;
the modification method of the sepiolite comprises the steps of uniformly mixing the sepiolite with 1mol/L hydrochloric acid according to the solid-to-liquid ratio of 1:10, placing the mixture in a 80 ℃ environment for shaking for 8 hours, carrying out centrifugal treatment, separating the hydrochloric acid from the sepiolite, adding deionized water into the separated sepiolite, repeatedly washing and centrifuging until the pH value of the sepiolite is 6, and drying to obtain the modified sepiolite.
Example 1
The embodiment provides a method for remedying heavy metal pollution of farmland soil, which specifically comprises the following steps,
ploughing and uniformly mixing the modified vermiculite and the soil in late 3 th of month, wherein the ploughing depth is 30cm, the consumption of the passivating agent is 100 kg/mu, and then maintaining for 15 days; then, in the spring stubble period, planting wheat in the first 4 th of the month, carrying out normal management, harvesting the wheat in the first 7 th of the month, and ploughing the farmland after recovering straws; planting super-enriched plant Solanum nigrum, and applying activator at the same time, 6 kg/mu, applying activator with water for 1 time every 15 days;
harvesting black nightshade in the last ten days of 8 months, ploughing and uniformly mixing the heavy metal passivator and soil, wherein the ploughing depth is 30cm, the use amount of the passivator is 100 kg/mu, and then maintaining for 15 days; in autumn and winter, planting foxtail millet in the last 9 th month, performing normal management, after harvesting in the last 11 th month, planting super-enriched plant solanum nigrum, simultaneously applying an activator with the concentration of 6 kg/mu, and applying the activator with water for 1 time every 15 days; and (4) after the black nightshade is harvested in the next 2 nd ten days of the year, detecting the farmland soil.
Example 2
The embodiment provides a method for remedying heavy metal pollution of farmland soil, which specifically comprises the following steps,
3, ploughing and uniformly mixing the modified biochar and soil in the middle ten days of the month, wherein the ploughing depth is 30cm, the consumption of the passivator is 120 kg/mu, and then maintaining for 15 days; then, in the spring stubble period, planting wheat in the first 4 th of the month, carrying out normal management, harvesting the wheat in the first 7 th of the month, and ploughing the farmland after recovering straws; planting the hyper-enriched plant vetiver while applying an activator, 8 kg/mu, applying the activator with water for 1 time every 15 days;
8, harvesting vetiver grass in late ten days, then turning and uniformly mixing the heavy metal passivator and soil, wherein the turning depth is 30cm, the use amount of the passivator is 120 kg/mu, and then maintaining for 15 days; in autumn and winter, planting millet in the first ten days of 9 months, performing normal management, after harvesting in the last 11 months, planting the super-enriched plant vetiver grass, simultaneously applying an activator with the concentration of 8 kg/mu, and applying the activator with water for 1 time every 15 days; and (5) detecting the farmland soil after the vetiver is harvested in 2 months in the next year.
Example 3
The embodiment provides a method for remedying heavy metal pollution of farmland soil, which specifically comprises the following steps,
3, in the middle of 3 months, taking a mixture of the modified vermiculite, the modified biochar and the modified sepiolite in a mass ratio of 3:1:1 as a passivating agent, turning and uniformly mixing the mixture with soil, wherein the turning depth is 10cm, the using amount of the passivating agent is 50 kg/mu, and then maintaining for 15 days; then, in the spring stubble period, broad beans are planted in the first 4 th month, the broad beans are normally managed, harvested in the first 7 th month, and then farmed in farmland; planting a hyper-enriched plant of sedum alfredii hance, simultaneously applying an activating agent for 3 kg/mu, and applying the activating agent with water for 1 time every 15 days;
harvesting the sedum alfredii in late 8 months, then turning over and uniformly mixing the heavy metal passivator and soil, wherein the turning depth is 30cm, the use amount of the passivator is 50 kg/mu, and then maintaining for 15 days; in autumn and winter, planting sweet potatoes in the first ten days of 9 months, carrying out normal management, after harvesting in the last 11 months, planting hyper-enriched plants, simultaneously applying an activating agent for 3 kg/mu, and applying the activating agent along with water for 1 time every 15 days; and (4) detecting the farmland soil after harvesting southeast scenery in the last 2 months of the next year.
Comparative example 1
The comparative example provides a method for remedying heavy metal pollution of farmland soil, and is different from the method in example 1 in the species of a first crop and a super-enriched plant, wherein the first crop is planted with potatoes, and the enriched plant is Indian mustard.
Comparative example 2
The comparative example provides a method for remedying heavy metal pollution of farmland soil, and is different from the method in example 2 in the types of passivators and activators, wherein the passivators in the comparative example are zeolite, and the activators are citric acid.
Comparative example 3
The comparative example provides a method for restoring heavy metal pollution of farmland soil, which is different from the method in the example 3 in that the application modes of a passivator and an activator are opposite, and the method specifically comprises the following steps:
the embodiment provides a method for remedying heavy metal pollution of farmland soil, which specifically comprises the following steps,
planting sedum alfredii in late 2 months, simultaneously applying an activating agent with the volume of 6 kg/mu, applying the activating agent with water for 1 time every 15 days, turning and uniformly mixing the heavy metal passivating agent and soil after harvesting sedum alfredii in the last 4 months, wherein the turning depth is 30cm, the using amount of the passivating agent is 100 kg/mu, then maintaining for 15 days, planting wheat in the last 5 months, normally managing, and detecting farmland soil after harvesting the wheat.
Test examples
The test example provides the detection methods and detection results of the soil in examples 1 to 3 and comparative examples 1 to 3, the specific results are shown in table 1, and the detection methods are as follows:
the method for detecting the content of the heavy metal in the soil is a digestion method, and the method comprises the following specific steps:
accurately weighing 0.5g of soil sample (passing through 0.15mm) and sieving the soil sample in a tetrafluoro crucible, adding 7mL of nitric acid, 3mL of perchloric acid and 10mL of hydrofluoric acid for covering, standing overnight (the same night effect is not needed), heating a high-temperature grade on an electric heating plate (the digital display control temperature is 300-350 ℃) for 1 hour, removing the cover, heating to be nearly dry, cooling to be normal temperature, then adding 3mL of nitric acid, 2mL of perchloric acid and 5mL of hydrofluoric acid, continuously heating the high-temperature grade until all kinds of acids are completely eliminated, namely, completely exhausting perchloric acid white smoke, adding 1mL of (1+1) hydrochloric acid to dissolve residues, completely transferring to a 25mL volumetric flask, adding 0.5mL of 100g/L ammonium chloride solution, fixing the volume, and then detecting by an atomic absorption spectrophotometer;
the heavy metal content reduction rate is (average value of soil initial heavy metal content-average value of soil heavy metal content after 2 nd enrichment plant harvest)/average value of soil initial heavy metal content is multiplied by 100%;
table 1 test results of soil in example 1 and comparative example 1
Table 2 test results of soil in example 2 and comparative example 2
Table 3 test results of soil in example 3 and comparative example 3
As can be seen from tables 1-3, the method for restoring heavy metal pollution of farmland soil provided by the invention is beneficial to improving the restoration of heavy metal in soil, and the method makes up the problem that the farmland land is occupied by the plant enrichment technology and the cultivation is influenced by selecting crops and hyper-enriched plants, so that the farmland can be normally cultivated; the invention adopts the plant enrichment technology and the method of applying the heavy metal passivator, which can not only remove the heavy metal, but also passivate the heavy metal when planting crops, thereby improving the use efficiency of the soil.
In table 1, as can be seen from example 1 and comparative example 1, the method for remediating heavy metal pollution in farmland soil provided by the invention can improve the remediation effect of heavy metal cadmium in soil by selecting crops and hyper-enriched plants. In table 2, as can be seen from example 2 and comparative example 2, the present invention facilitates the remediation of heavy metal lead from soil and improves the remediation effect by selecting the types of passivators and activators. In table 3, as can be seen from example 3 and comparative example 3, the present invention contributes to the improvement of the soil restoration effect on heavy metal zinc by selecting the application sequence of the passivator and the activator.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (4)
1. A method for remedying heavy metal pollution of farmland soil is characterized by comprising the following steps,
before planting crops, uniformly mixing the heavy metal passivator and soil by turning 10-30cm, and maintaining for 12-17 days;
planting a first crop in a spring stubble period, planting a super-enriched plant after the first crop is harvested, and applying a heavy metal activating agent;
harvesting hyperaccumulator plants before autumn and winter stubbles, then applying a heavy metal passivator, ploughing by 10-30cm, uniformly mixing, and maintaining for 12-17 days;
in the autumn and winter stubble period, planting a second crop, and after harvesting the second crop, planting a hyper-enrichment plant and simultaneously applying a heavy metal activator or performing fallow till the next spring stubble period;
wherein the hyper-enriched plant comprises vetiver, castor-oil plant, Sedum alfredii Hance, Solanum nigrum L, Lonicera japonica Thunb or Stenoloma chusana L; the first crop comprises wheat, broad bean, corn or soybean; the second crop comprises corn, soybean, sweet potato, millet, peanut or tobacco;
the activating agent comprises humic acid, polyaspartic acid, polyglutamic acid, itaconic acid, sorbitol, citric acid, a microbial agent and a root promoting agent;
the passivating agent is at least one of modified vermiculite, modified biochar and modified sepiolite;
the root promoting agent comprises at least one of iminodisuccinic acid, [9, 9-di (2-ethylhexyl) -9H-fluorene-2, 7-diyl ] diboronic acid and 4-nitrophenyl-beta-D-cellobioside;
the microbial agent comprises at least one of bacillus subtilis, trichoderma viride, bacillus licheniformis, urease bacillus, saccharomycetes and pseudomonas;
the activator comprises, by mass, 20-25% of humic acid, 15-20% of polyaspartic acid, 15-20% of polyglutamic acid, 15-20% of itaconic acid, 8-10% of sorbitol, 8-10% of citric acid, 3-5% of a microbial agent and 0.5-2% of a root promoting agent.
2. The method according to claim 1, wherein the amount of the heavy metal deactivator is 50-150 kg/acre.
3. The method according to claim 2, wherein the activating agent is prepared by drying 25% humic acid, 20% polyaspartic acid, 15% polyglutamic acid, 20% itaconic acid, 8% sorbitol, 8% citric acid, grinding, sieving to remove impurities, dissolving in water, adding 0.5% root-promoting agent, mixing and dispersing, spray drying, and adding 3.5% microbial agent to obtain the powdered heavy metal activating agent.
4. A method according to any one of claims 1 to 3, wherein the amount of activator is from 3 to 10 kg/acre.
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| CN110893413A (en) * | 2019-11-26 | 2020-03-20 | 西北师范大学 | Method for restoring cadmium-polluted soil by utilizing in-situ activation, passivation and high-accumulation crops |
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| CN113042001B (en) * | 2021-03-26 | 2022-01-14 | 维塔探索(广东)科技有限公司 | Porous biochar for improving severe pollution and preparation method thereof |
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| CN104893732B (en) * | 2015-06-05 | 2017-02-15 | 中国地质科学院矿产资源研究所 | soil repairing agent and preparation method and use method thereof |
| CN105219668B (en) * | 2015-08-31 | 2018-10-26 | 福建三炬生物科技股份有限公司 | A kind of heavy metal-polluted soil activation microbial inoculum and the preparation method and application thereof |
| CN107116097B (en) * | 2017-06-21 | 2018-02-16 | 郑州航空工业管理学院 | A kind of method for repairing As polluted soil |
| CN107858147B (en) * | 2017-11-06 | 2020-10-20 | 中国农业大学 | Soil phosphorus activator with root promoting effect |
| CN109365516A (en) * | 2018-09-21 | 2019-02-22 | 罗永恒 | A method of repairing heavy metals in farmland pollution |
| CN109593529A (en) * | 2018-12-10 | 2019-04-09 | 中冶华天工程技术有限公司 | The preparation method and applications method of phosphorus base modification biological charcoal |
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