CN110773563B - Method for repairing cadmium-zinc polluted soil by using grass dragon - Google Patents
Method for repairing cadmium-zinc polluted soil by using grass dragon Download PDFInfo
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Biotechnology (AREA)
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- Biomedical Technology (AREA)
- Botany (AREA)
- General Health & Medical Sciences (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the technical field of soil pollution remediation, in particular to a method for remediating cadmium-zinc polluted soil by using a carex pekinensis. The method of the invention comprises the following steps: transplanting the seedling of the grass dragon or directly sowing the seeds of the grass dragon into the soil polluted by cadmium and zinc; when the overground part forms certain biomass, harvesting for the first time, then harvesting for a fixed period with the stubble left, and carrying out centralized treatment on the harvested grass dragon. Aiming at the problem of shortage of plant variety resources which can be used for restoring heavy metal contaminated soil plants, the invention provides a novel plant variety of carex, which is used for restoring heavy metal Cd and Zn contaminated soil, meanwhile, synergistic solution and the like are used for promoting the enrichment of carex to the heavy metal Cd and Zn, when the overground part forms a certain biomass, the carex is left for harvesting and continuous extraction, and thus, the purpose of reducing the content of Cd and Zn in the contaminated soil is achieved.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of soil pollution remediation, in particular to a method for remediating cadmium-zinc polluted soil by using a carex pekinensis.
[ background of the invention ]
With the rapid development of industrial, agricultural and economic globalization and the long-term, large-scale and unreasonable application of agricultural fertilizers and industrial wastewater, the problem of heavy metal pollution of farmland soil is becoming serious day by day, and potential threats are brought to agricultural production and human health, so that the heavy metal polluted soil needs to be repaired.
The heavy metal contaminated soil is rarely polluted by single metal, and the heavy metal pollution is mostly complex pollution found in actual production. The heavy metal pollution sources of soil are wide, and include waste residues, waste water, waste gas and sewage discharged by mining and industrial and mining enterprises, solid wastes such as sludge and the like, agricultural chemicals such as phosphate fertilizers and the like, atmospheric sediments and the like. Heavy metal pollution has the characteristics of long-term property, accumulative property, concealment property and irreversibility, so that the heavy metal pollution is very difficult to treat.
At present, the remediation method of the heavy metal contaminated soil mainly comprises physical, chemical and biological remediation. The physical and chemical remediation engineering is large in quantity and expensive, large-scale utilization is difficult, secondary pollution is possibly caused, and adverse effects on soil fertility, soil structure and soil microorganisms are caused. The plant extraction and remediation of soil heavy metal pollution in biological remediation is a green technology which is most researched and has the greatest development prospect at present, and the plant remediation is to plant enrichment plants which grow naturally or are cultured genetically on the polluted soil to absorb heavy metals, so that the heavy metal content of the soil is reduced to achieve the purpose of treatment. The method has the advantages of high efficiency, low consumption, no secondary pollution, capability of reducing soil erosion, beautifying the environment and the like, and can achieve permanent clean restoration of the polluted soil, so the method is known as an environment-friendly in-situ green restoration technology. Heavy metal enriching plants often have certain selectivity to heavy metals, soil heavy metal pollution is mostly multiple heavy metal composite pollution, and multiple pollutants in soil are difficult to remove comprehensively by single selective heavy metal enriching plants. Therefore, the method is a key to solve the urgent need of the plant restoration technology for the heavy metal composite contaminated soil by analyzing the content of the heavy metal in the soil and the plant body, determining the absorption and enrichment characteristics of the enrichment plant to the heavy metal, discussing the application potential of the enrichment plant to the environmental purification, and screening the plants with tolerance, accumulation characteristics and large biomass to the heavy metal composite contaminated soil.
At present, the plants developed for repairing the heavy metal pollution of the soil mainly comprise crowndaisy chrysanthemum, Indian mustard, viola baoshanensis, sedum alfredii hance, sedum plumbizincicola, solanum nigrum and the like. However, with the development of the industrial and mining industry, the soil is polluted more and more by heavy metals, the types of the heavy metals are more, and the adaptability of the plants to different soils and the capability of restoring the types of the heavy metals are limited to a certain extent. Therefore, at present, new plant resources are urgently needed to be developed and searched for repairing heavy metal composite contaminated soil so as to solve the problem of the increasingly serious heavy metal composite contaminated soil.
[ summary of the invention ]
The inventor has been engaged in research work for repairing and regulating heavy metal pollution for many years, and found that the plant of Ludwigia linifolia Poir (Latin is named as Ludwigia linifolia Poir.) of Ludwigia of Onagraceae has certain enrichment characteristic on heavy metals Cd and Zn in soil environment. Therefore, the invention aims to provide a new plant variety, namely, the grass dragon, for repairing the soil polluted by heavy metals Cd and Zn aiming at the problem of the shortage of plant variety resources for repairing the heavy metal polluted soil.
In order to achieve the repairing purpose, the technical scheme of the invention is as follows:
a method for repairing cadmium-zinc polluted soil by using grass dragon comprises the following steps: transplanting the seedling of the grass dragon or directly sowing the seeds of the grass dragon into the soil polluted by cadmium and zinc; and harvesting for the first time when the overground part grows to a height of 80-90 cm, then harvesting for a fixed period with the stubble left, and carrying out centralized treatment on the harvested grass dragon.
Further, transplanting 5-10cm long-grass dragon seedlings into the cadmium-zinc polluted soil, harvesting the overground parts of the grass dragon when the overground parts grow to the height of 80-90 cm, and harvesting once every 2-3 months or every 80-90 cm long.
Further, the centralized treatment is to perform ashing treatment on the harvested turfgrass or perform extraction of cadmium and zinc as raw materials.
Further, in the growth process of the grass dragon, the synergistic liquid and the synergistic particles are applied to the grass dragon;
the preparation method of the synergistic liquid comprises the following steps:
s1, taking the litchi branches, drying and crushing to obtain litchi powder;
s2, adding litchi powder and hydroxyapatite powder into the biogas slurry, mixing uniformly, sealing, standing for 2-3 days, and filtering to obtain filtrate; the mass ratio of the litchi powder to the hydroxyapatite powder to the biogas slurry is 1-2: 0.2-0.5: 50-100 parts of; the filter residue can be used as fertilizer;
s3, taking Trichoderma harzianum, diluting the Trichoderma harzianum with water by 3000 times, and obtaining a bacterial liquid;
s4, mixing the filtrate obtained in the step S2 and the bacterial liquid obtained in the step S3 in a ratio of 1: 1-2, and uniformly mixing to obtain synergistic solution;
the preparation method of the synergistic particles comprises the following steps:
A. drying the Ambrosia trifida, and crushing to obtain Ambrosia trifida powder;
B. adding quick lime and biogas residues into the ragweed powder, and stirring uniformly to obtain a mixture; the mass ratio of the ragweed powder, the quicklime and the biogas residue is 50-100: 1: 10-20 parts of;
C. adding water into the mixture, mixing, controlling the water content of the mixture to be 40-50%, sealing and fermenting for 10-15 days to obtain the synergistic particles.
Further, the synergistic liquid is directly sprayed to the root of the grass dragon when being sprayed, and is sprayed once every 10 days; the synergistic particles are directly spread on the soil after 10-15 days of transplanting and field planting of the young seedlings of the grass dragon or 30 days of sowing and harvesting.
Furthermore, the organic matter contained in the biogas slurry is 0.15-0.20%, the total nitrogen is 1.20-1.30g/kg, the total phosphorus is 0.20-0.30g/kg, and the total potassium is 0.20-0.30 g/kg; the pH value is 6.8-7.2; the biogas residue contains 40-50% of organic matters, 15-25% of humic acid, 0.6-1.4% of total nitrogen, 0.3-0.6% of total phosphorus and 0.5-1.1% of total potassium.
Further, when the plant of the grass dragon is harvested to the 4 th to 5 th stubbles, the grass dragon is pulled up with the root, and the whole plant of the grass dragon is treated in a centralized way.
The growth speed of the grass dragon is high, the stress resistance is strong, the grass dragon is easy to survive, and the grass dragon can be directly transplanted or the seeds can be directly sown and grown; can survive under natural conditions without special management in the whole growth process. The soil is harvested periodically when a certain biomass is formed on the overground part, so that the content of heavy metals Cd and Zn in the polluted soil can be effectively reduced, and the polluted soil is repaired.
Has the advantages that:
the domestic plant variety resources are rich and various, it is very difficult to determine whether a certain plant has the characteristics of heavy metal enrichment or hyper-enrichment, and the plant variety resources cannot be successfully determined after a large amount of manpower, material resources and financial resources are consumed. The Caolong (Ludwigiinifolia Poir) in the invention is also named as ludwigilinifolia and ludwigiensis hydropiper; belongs to a plant of ludwigia of Onagraceae, and is grown in wet sunny places such as field edge, ditch, river beach, pond edge, and wet grassy land; distributed in Taiwan, hong Kong, Guangdong, Hainan, Guangxi, and Yunnan. The experimental study proves that the heavy metal Cd and Zn have enrichment characteristics. The invention fully utilizes the enrichment characteristic of the carex, transplanting seedlings or directly seeding seeds of the carex into the soil polluted by heavy metals, absorbing and accumulating the heavy metals Cd and Zn in the soil, transferring the heavy metals Cd and Zn to the overground part, reducing the content of Cd and Zn in the soil, and when the overground part forms a certain biomass, leaving stubbles and harvesting for continuous extraction, thereby achieving the purpose of reducing the content of Cd and Zn in the polluted soil. The grass dragon utilizes the enrichment characteristic of the grass dragon to heavy metals Cd and Zn, can adsorb Cd and Zn to the roots of the grass dragon, then transfers the heavy metals of the roots to the overground parts of plants through the growth effect, and can effectively reduce the risk of groundwater pollution caused by downward migration of the heavy metals.
In the process of repairing the heavy metal cadmium zinc in the soil by using the carex, the inventor further researches substances for promoting the carex to absorb the cadmium zinc so as to improve the cadmium zinc enriching capacity of the carex. The components of the biogas slurry used by the synergistic liquid are very complex, and the synergistic liquid contains active resistant substances such as butyric acid, indoleacetic acid, vitamin B12 and the like besides abundant nitrogen, phosphorus, potassium, various amino acids, vitamins, proteins, gibberellin, auxin, saccharides, nucleic acid, antibiotics and the like; the invention uses biogas slurry to ferment and extract the effective components of the growth-promoting roots in the litchi branches and trunks, and the effective components in the biogas slurry are matched, so that the growth of the root system of the grass dragon can be promoted after the litchi branches and trunks are applied to grass dragon plants, the root system of the grass dragon is distributed more densely and stronger, and the method has obvious synergistic effect on cadmium and zinc enriched in soil. The hydroxyapatite powder in the components of the synergistic liquid contains many associated elements, the synergistic effect can be assisted after the biogas slurry fermentation, and the trichoderma harzianum liquid in the components also has the effect of enriching cadmium and zinc in a synergistic manner. Through the mutual matching of the components of the synergistic solution, the growth of the root system and the overground part of the grass dragon can be promoted, and the enrichment of cadmium and zinc by the grass dragon can be promoted. The Ambrosia trifida is a foreign invasive species, is easy to cause soil drought and barren due to extremely strong fertilizer absorption capacity and regeneration capacity, and pollen of the Ambrosia trifida is a main disease source of pollinosis, can cause symptoms such as allergic rhinitis and bronchial asthma, is a hundred of pests and is not beneficial weed, so the Ambrosia trifida is fully utilized, and the invasion of the foreign species can be reduced; after the Ambrosia trifoliata, the quick lime and the biogas residues are mixed and fermented, nutrients such as trace elements, organic substances and the like can be provided for the grass dragon, so that the grass dragon grows faster. The ragweed powder with the three-split leaves, the quick lime, the biogas residues and the water are fermented under certain humidity, and the obtained particles can promote the growth of the plant of the carex saururus and the enrichment of cadmium and zinc.
The synergistic liquid and the synergistic particles used in the invention have the advantages of cheap and easily available raw materials, simple production process operation, no need of special reagents or large-scale processing equipment, low preparation cost and large-area use.
[ detailed description ] embodiments
The following examples are provided to further illustrate the embodiments of the present invention.
Example 1
A method for repairing cadmium-zinc polluted soil by using grass dragon comprises the following steps: transplanting the seedling of the grass dragon into the soil polluted by cadmium and zinc; when the overground part forms certain biomass, harvesting for the first time, then, leaving stubbles to harvest the overground part regularly, when the 4 th stubbles are harvested, pulling up the stubbles, and carrying out centralized ashing treatment on the harvested stubbles and roots or extracting cadmium and zinc as raw materials; the method comprises the following specific steps:
transplanting 5-10cm long grass-dragon seedlings into cadmium-zinc polluted soil in a heavy metal polluted soil area around a Guangxi Yulin mining area by adopting a direct transplanting mode under natural conditions, and watering at irregular intervals according to climatic conditions and plant growth conditions. And harvesting the overground part of the grass dragon for the first time after the overground part grows to the height of 80-90 cm after 90 days, and then harvesting every 2-3 months after the overground part grows.
Applying the synergistic liquid and the synergistic particles to the grass dragon in the growth process of the grass dragon; the synergistic liquid is directly sprayed to the roots of the grass dragon when being sprayed, and is sprayed once every 10 days until the soil is moist; the synergistic particles are directly applied to soil after 15 days of transplanting and field planting of the young grass-dragon seedlings and after harvesting, and the thickness of the application is about 1 cm.
The preparation method of the synergistic liquid comprises the following steps:
s1, taking the litchi branches, drying and crushing to obtain litchi powder;
s2, adding litchi powder and hydroxyapatite powder into the biogas slurry, mixing uniformly, sealing, standing for 3 days, and filtering to obtain filtrate; the mass ratio of the litchi powder to the hydroxyapatite powder to the biogas slurry is 1: 0.2: 50; the organic matter contained in the biogas slurry is 0.18%, the total nitrogen is 1.27g/kg, the total phosphorus is 0.23g/kg, and the total potassium is 0.28 g/kg; the pH was 7.2;
s3, taking Trichoderma harzianum, and diluting with water by 2000 times to obtain a bacterial liquid;
s4, mixing the filtrate obtained in the step S2 and the bacterial liquid obtained in the step S3 in a ratio of 1: 1, and uniformly mixing to obtain synergistic solution;
the preparation method of the synergistic particles comprises the following steps:
A. drying the Ambrosia trifida, and crushing to obtain Ambrosia trifida powder;
B. adding quick lime and biogas residues into the ragweed powder, and stirring uniformly to obtain a mixture; the mass ratio of the ragweed powder with the schizophyllum commune, the quicklime and the biogas residues is 50: 1: 10; the biogas residue contains 42% of organic matters, 19% of humic acid, 1.2% of total nitrogen, 0.4% of total phosphorus and 1.0% of total potassium.
C. Adding water into the mixture, mixing uniformly, controlling the water content of the mixture to be 50%, and sealing and fermenting for 15 days to obtain the synergistic particles.
Example 2
A method for repairing cadmium-zinc polluted soil by using grass dragon comprises the following steps: directly sowing the grass dragon seeds into the soil polluted by cadmium and zinc; harvesting for the first time when the overground part grows to a certain biomass, then harvesting the overground part with the stubble at regular intervals, pulling up the continuous roots when the 5 th stubble of the grass dragon plant is harvested, and performing centralized ashing treatment on the harvested grass dragon and the roots or extracting cadmium and zinc as raw materials; the method comprises the following specific steps:
directly sowing the grass dragon seeds into the soil polluted by cadmium and zinc around the mine area of the Guangxi river pool in a seed direct sowing mode; watering at irregular time according to climate conditions and plant growth conditions. And harvesting the overground part of the plant for the first time when the overground part grows to the height of 80-90 cm, then, harvesting the plant for a period of time after leaving stubbles, and harvesting the plant for the first time when the plant grows to the height of 80-90 cm.
Applying the synergistic liquid and the synergistic particles to the grass dragon in the growth process of the grass dragon; the synergistic liquid is directly sprayed to the roots of the grass dragon when being sprayed, and is sprayed once every 10 days until the soil is moist; the synergistic particles are directly applied to the soil after the grass dragon is sowed for 30 days and harvested, and the application thickness is about 1 cm.
The preparation method of the synergistic liquid comprises the following steps:
s1, taking the litchi branches, drying and crushing to obtain litchi powder;
s2, adding litchi powder and hydroxyapatite powder into the biogas slurry, mixing uniformly, sealing, standing for 2 days, and filtering to obtain filtrate; the mass ratio of the litchi powder to the hydroxyapatite powder to the biogas slurry is 2: 0.5: 100, respectively; the organic matter contained in the biogas slurry is 0.16%, the total nitrogen is 1.25g/kg, the total phosphorus is 0.27g/kg, and the total potassium is 0.21 g/kg; the pH was 6.9;
s3, taking Trichoderma harzianum, and diluting 3000 times with water to obtain a bacterial liquid;
s4, mixing the filtrate obtained in the step S2 and the bacterial liquid obtained in the step S3 in a ratio of 1: 2, uniformly mixing to obtain synergistic solution;
the preparation method of the synergistic particles comprises the following steps:
A. drying the Ambrosia trifida, and crushing to obtain Ambrosia trifida powder;
B. adding quick lime and biogas residues into the ragweed powder, and stirring uniformly to obtain a mixture; the mass ratio of the ragweed powder, the quicklime and the biogas residues is 100: 1: 20; the biogas residue contains 50% of organic matters, 22% of humic acid, 1.3% of total nitrogen, 0.6% of total phosphorus and 0.8% of total potassium.
C. Adding water into the mixture, mixing, controlling the water content of the mixture to be 40%, sealing and fermenting for 10 days to obtain the synergistic particles.
Example 3
A method for repairing cadmium-zinc polluted soil by using grass dragon comprises the following steps: directly sowing the grass dragon seeds into the soil polluted by cadmium and zinc around the Guangxi river pool (in the same area as the embodiment 2); watering at irregular time according to climate conditions and plant growth conditions. When the overground part grows to 80-90 cm height, harvesting the overground part of the plant for the first time, then harvesting stubble at regular intervals, harvesting the grass dragon once when the grass dragon grows to 80-90 cm height, and pulling up the root of the grass dragon when the grass dragon grows to the 5 th time. Carrying out concentrated ashing treatment on the grass dragon and the root system harvested from the polluted soil, and then safely burying ash or taking the ash as a raw material for extracting cadmium and zinc.
In order to verify the technical effect of the invention, the inventor harvests the overground part of the carex when the overground part of the carex grows to the height of 80-90 cm for the first time and detects the overground part of the carex, and the data are shown in table 1; soil around getting the grass dragon of planting detects, in order to ensure uniformity around during the sample, avoids the influence of remaining synergistic granule, and every group sampling point is 10, at the soil sampling of the below ground about 5cm, detects after the misce bene, and the sampling point around the grass dragon planting is unanimous, and concrete detection data is as shown in table 2.
TABLE 1
As can be seen from the data analysis in Table 1, the strawberries of examples 1-3 are enriched with more cadmium and zinc, which indicates that the method of the present invention can repair the cadmium and zinc pollution in the soil. As can be seen from the comparison between the data of example 2 and the data of example 3, in example 3, the cadmium content is enriched and reduced by about 27% and the zinc content is enriched and reduced by about 7% because no synergist or synergist particles are applied, so that the synergist or synergist particles of the present invention have a significant synergistic effect on the cadmium and zinc enrichment of the carex.
TABLE 2
As can be seen from the data in table 2, in example 1, after the turfgrass is planted and harvested at the last time, the cadmium content in the soil is reduced by about 2.0%, and the zinc content in the soil is reduced by about 5.3%; example 2 after the growth of the grass dragon and the final harvest of the grass dragon, the cadmium content in the soil is reduced by about 2.2 percent, and the zinc content in the soil is reduced by about 5.6 percent; example 3 after planting the grass dragon to the last harvest, the cadmium content in the soil was reduced by about 1.0% and the zinc content in the soil was reduced by about 4.2%. Therefore, the method can effectively repair the cadmium-zinc polluted soil, and the soil repair effect is greatly improved after the synergistic liquid and the synergistic particles are used.
In addition, the inventors also used aster rhynchophylla for comparative experiments, as follows:
test group 1: the method of example 2 was used except that aster rhynchophylla of asteraceae was used instead of Caolong.
Test group 2: the method of example 3 was used except that aster rhynchophylla of asteraceae was used instead of Caolong.
Detecting soil before and after planting aster rhynchophylla, and sampling by the same method as that of the grass dragon; specific detection data are shown in table 3.
TABLE 3
As can be seen from the data in table 3, in test group 1, after planting aster rhynchophylla till the last harvest of aster rhynchophylla, the cadmium content in the soil was reduced by about 0.53%, and the zinc content in the soil was reduced by about 3.0%; in test group 2, the cadmium content in the soil was reduced by about 1.3% and the zinc content in the soil was reduced by about 4.8% from the time of planting aster rhynchophylla to the time of harvesting aster rhynchophylla. From the data of the experimental group 2, it can be seen that the cadmium and zinc enrichment capacity is slightly stronger after the aster rigescens is directly planted than that of the grass dragon. However, as can be seen from the data of test group 1, the synergistic solution and the synergistic particles used after planting aster rigescens do not have a synergistic effect, but rather cause a serious decrease in the cadmium and zinc enrichment capacity. The synergistic liquid and the synergistic particles are researched and set aiming at the grass dragon, and are not suitable for all plants.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (6)
1. A method for repairing cadmium-zinc polluted soil by using grass dragon is characterized by comprising the following steps: transplanting the seedling of the grass dragon or directly sowing the seeds of the grass dragon into the soil polluted by cadmium and zinc; harvesting for the first time when the overground part grows to a height of 80-90 cm, then harvesting for a fixed period with the stubble left, and carrying out centralized treatment on the harvested grass dragon;
applying the synergistic liquid and the synergistic particles to the grass dragon in the growth process of the grass dragon;
the preparation method of the synergistic liquid comprises the following steps:
s1, taking the litchi branches, drying and crushing to obtain litchi powder;
s2, adding litchi powder and hydroxyapatite powder into the biogas slurry, mixing uniformly, sealing, standing for 2-3 days, and filtering to obtain filtrate; the mass ratio of the litchi powder to the hydroxyapatite powder to the biogas slurry is 1-2: 0.2-0.5: 50-100 parts of;
s3, taking Trichoderma harzianum, diluting the Trichoderma harzianum with water by 3000 times, and obtaining a bacterial liquid;
s4, mixing the filtrate obtained in the step S2 and the bacterial liquid obtained in the step S3 in a ratio of 1: 1-2, and uniformly mixing to obtain synergistic solution;
the preparation method of the synergistic particles comprises the following steps:
A. drying the Ambrosia trifida, and crushing to obtain Ambrosia trifida powder;
B. adding quick lime and biogas residues into the ragweed powder, and stirring uniformly to obtain a mixture; the mass ratio of the ragweed powder, the quicklime and the biogas residue is 50-100: 1: 10-20 parts of;
C. adding water into the mixture, mixing, controlling the water content of the mixture to be 40-50%, sealing and fermenting for 10-15 days to obtain the synergistic particles.
2. The method for remediating cadmium-zinc contaminated soil by using a carex as set forth in claim 1, wherein: transplanting 5-10cm long-stalked grass dragon seedlings into cadmium-zinc polluted soil, harvesting the overground part of the grass dragon when the overground part grows to 80-90 cm high, and then harvesting every 2-3 months or every 80-90 cm high.
3. The method for remediating cadmium-zinc contaminated soil by using a carex as set forth in claim 1, wherein: the centralized treatment is to perform ashing treatment on the harvested turfgrass or extract cadmium and zinc as raw materials.
4. The method for remediating cadmium-zinc contaminated soil by using a carex as set forth in claim 1, wherein: the synergistic liquid is directly sprayed on the roots of the grass dragon when being sprayed, and is sprayed once every 10 days; the synergistic particles are directly spread on the soil after 10-15 days of transplanting and field planting of the young seedlings of the grass dragon or 30 days of sowing and harvesting.
5. The method for remediating cadmium-zinc contaminated soil by using a carex as set forth in claim 1, wherein: the biogas slurry contains 0.15-0.20% of organic matters, 1.20-1.30g/kg of total nitrogen, 0.20-0.30g/kg of total phosphorus and 0.20-0.30g/kg of total potassium; the pH value is 6.8-7.2; the biogas residue contains 40-50% of organic matters, 15-25% of humic acid, 0.6-1.4% of total nitrogen, 0.3-0.6% of total phosphorus and 0.5-1.1% of total potassium.
6. The method for remediating cadmium-zinc contaminated soil by using a carex as set forth in claim 1, wherein: when the plant of the grass dragon is harvested to the 4 th to 5 th stubbles, the grass dragon is pulled up with the root, and the whole grass dragon is treated in a centralized way.
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