CN107838183B - Method for repairing antimony-polluted soil - Google Patents
Method for repairing antimony-polluted soil Download PDFInfo
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- CN107838183B CN107838183B CN201711035492.8A CN201711035492A CN107838183B CN 107838183 B CN107838183 B CN 107838183B CN 201711035492 A CN201711035492 A CN 201711035492A CN 107838183 B CN107838183 B CN 107838183B
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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
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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
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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Abstract
The invention relates to a method for repairing antimony-contaminated soil, which comprises the steps of applying an antimony activator to the antimony-contaminated soil, ploughing and uniformly mixing, keeping the soil submerged for 1-3 cm, planting pteridium aquilinum when a plough layer is still wet after balancing for 3-7 days, keeping warm, moist and free of continuous insolation in the whole growth process, irrigating an antimony activator solution 10-15 days before harvesting, and removing overground parts of plants and performing harmless treatment after the plants grow vigorously for 10-15 days; detecting whether the content of heavy metal antimony in the repaired soil reaches the standard, and if not, planting the next batch of white jade bracken by the method until the content reaches the standard. By adding the activating agent into the soil, the migration and accumulation of antimony in the soil to the overground part of the plant can be effectively promoted, the soil environment and the conditions required by the growth of the plant can be improved, and the aim of restoring the antimony-polluted soil by the plant is fulfilled; the method also has the advantages of good repairing effect, low repairing cost, small environmental risk and the like.
Description
Technical Field
The invention relates to a method for repairing antimony-polluted soil, in particular to a method for repairing antimony-polluted soil by combining an activator and an enrichment plant, and belongs to the field of heavy metal-polluted soil repair.
Background
Antimony is used as a pollution element, the high content of antimony in the environment inevitably affects the normal growth and yield of local plants, particularly crops, and the content of antimony in agricultural products exceeds the standard, and then the antimony is accumulated in human bodies through a food chain. Antimony has been shown to be a toxic carcinogenic element, which can interfere with the metabolism of proteins and sugars in the body by binding to sulfhydryl groups in the human body, and can also damage the liver, heart and nervous system, and cause irritation to mucous membranes. 609 workers in the antimony mine in the Hunan tin mine were investigated and found that 20.03% of the workers had pneumoconiosis; the content of antimony in local human hair in the mining area is as high as 15.9mg-1. Many chronic antimony poisoning patients are also found in residents who live in antimony ore areas for a long time in the southeast and Qian areas of Guizhou province. Although the national soil environment quality standard is adopted at presentThere are no limits to antimony, but antimony pollution has contaminated crops and endangered the health of the inhabitants of the contaminated area. Therefore, the problem of environmental pollution caused by soil antimony is urgently solved.
At present, the technologies for remedying the antimony pollution of the soil are few, and the technologies are mainly divided into a physical and chemical remediation method and a plant remediation method, wherein the physical and chemical remediation method mainly comprises soil dressing, soil replacement, electric remediation, chemical leaching, chemical solidification and the like, but the physical and chemical remediation technologies have the advantages of high cost, slow effect taking, easy generation of secondary pollution and great damage to the ecological environment of the soil, so that the technology is not a long-term technology for remedying the antimony pollution problem of the soil. The phytoremediation technology is an environmental pollution treatment technology which is based on the capability that plants can tolerate and accumulate certain or some heavy metal elements, and the heavy metals can be removed from soil by harvesting the heavy metals after being absorbed by the plants and carrying out proper treatment, so as to achieve the purposes of pollution treatment and ecological remediation. The phytoremediation is low in investment cost, good in remediation effect and free of secondary pollution in the aspect of treating soil antimony pollution, so that the phytoremediation becomes a research hotspot and a key point of soil heavy metal remediation in the field. The enrichment plants are important for research on phytoremediation, and although the enrichment plants have a good enrichment effect on heavy metals, the application of the phytoremediation technology is limited to a certain extent due to the characteristics of low biomass, long remediation period and the like.
Therefore, it is very important to develop a method that can not only improve the restoration effect of plants, but also increase the biomass of plants and reduce the restoration period of plants.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method for restoring soil polluted by antimony by combining an activator and an enrichment plant, which fully plays the role of the activator in activating soil antimony and aims to improve the bioavailability of antimony to the enrichment plant and the like, so as to improve the enrichment effect of the plant, and is a method for restoring soil heavy metal antimony with low restoration cost, good restoration effect and no secondary pollution.
In order to solve the technical problems, the technical scheme of the invention is as follows: a method for repairing antimony-contaminated soil comprises the following steps:
s1, adding an antimony activating agent into the antimony-polluted soil, ploughing and uniformly mixing, keeping the soil flooded by 1-3 cm, planting pteris multifida when the plough layer is still wet after balancing for 3-7 days, keeping the growing environment warm, wet and free of continuous insolation in the whole plant growing process, and then harvesting and performing harmless treatment on the pteris multifida after 10-15 days of the most vigorous growth period of the pteris multifida;
s2, detecting whether the content of the heavy metal antimony in the soil repaired in the step S1 reaches the standard, and if not, planting the pteridium aquilinum of the next batch according to the method in the step S1 until the content of the antimony in the soil reaches the standard.
Step S2, detecting whether the content of heavy metal antimony in the repaired soil reaches the standard, mainly referring to the background value range of local soil antimony, and if detecting that the content of heavy metal antimony in the repaired soil reaches the background value range of local soil antimony, reaching the standard; if the antimony content is higher than the background value range of local soil antimony, the soil antimony content does not reach the standard.
The local soil antimony background value refers to the content of antimony element in the soil which is not affected by human pollution locally.
By adding the antimony activating agent into the soil, the activity of antimony in the soil is improved, the migration and accumulation of the antimony in the soil to the overground part of the plant are promoted, the soil environment and the conditions required by the growth of the plant are improved, and the aim of restoring the antimony-polluted soil by the plant is fulfilled.
Preferably, the antimony activator is a powder.
The antimony activator is calcium carbonate.
The antimony activator can improve the activity of heavy metals in soil and promote the accumulation of the heavy metals in plants. CaCO3Has strong activation capability on antimony in soil, and has the advantages of safety, reliability, low raw material cost and the like as a natural mineral product.
The antimony activator is applied prior to the hydroponic measures at an amount of 0.5 to 1.5 tons/acre, preferably 1.25 tons/acre.
In order to supplement or enhance the enrichment of the white pteris multifida with antimony, the antimony activating agent solution is irrigated to the antimony contaminated soil 10-15 days before the pteris multifida is harvested.
Preferably, the antimony activator solution is a saturated calcium carbonate solution.
The Pteris multifida is white jade Pteris multifida.
The Pteridium aquilinum is used as the antimony-enriching plant, and is seeded with spore to propagate, the mature spore is sown homogeneously on the sterilized substrate, and the substrate is soaked in shallow water to moisten the soil, and the pot is covered with glass and set in shady shed at 20-25 deg.c for 60 days to grow sporophyll.
In step S1, outdoor cultivation is adopted, watering is carried out regularly, soil is kept moist, and the water content of the soil is kept to be 70-80% of the field water capacity.
In step S1, harvesting pteridium aquilinum mainly refers to removing the aerial parts of pteridium aquilinum.
The aerial part of the Pteris multifida refers to the part of the Pteris multifida such as the stem and leaves exposed on the ground.
In step S1, the harmless treatment comprises the steps of pteris fern incineration, flue gas purification, ash solidification and landfill.
Compared with the prior art, the invention has the following beneficial effects:
(1) compared with other physical and chemical remediation methods, the method for remedying the antimony pollution in the soil by adopting the plants has the advantages of low investment cost, good remediation effect, simplicity in operation, no secondary pollution and the like.
(2) Antimony activator CaCO used in the present invention3Has the characteristics of good activation effect on antimony in soil and simple and easily obtained raw materials.
(3) The invention is achieved by applying CaCO3The method of (1) gives full play to CaCO3The method has the advantages of increasing biomass, improving Sb enrichment amount, shortening production period, reducing bioavailability of Cd, Pb, Cu and other heavy metal elements possibly existing in soil, and comprehensively reducing toxic action of heavy metals on plants.
Drawings
FIG. 1 is a graph showing the effect of different activator addition treatments on the antimony content of plants in example 1 of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The pot experiment area is arranged in a laboratory built by an applicant, the area of the laboratory belongs to subtropical monsoon humid climate, is clear in four seasons and has sufficient sunshine time and rainwater, the average temperature of many years is 17.5 ℃, the annual rainfall is about 1200 mm, the annual sunshine total time is about 2000 hours, and the annual frost-free period is about 240 days. The soil for the pot culture test is collected from paddy field plough layer soil (0-20 cm) near mining and mineral dressing of certain antimony mine in Hunan province, the soil type belongs to red soil, after the soil is naturally air-dried, residual plants and gravels in the soil are removed, the soil is ground by a 10-mesh nylon sieve, and the basic physicochemical properties of the soil are measured as follows: the pH value is 5.21, the organic matter is 26.32g/kg, the total phosphorus is 0.71g/kg, the total nitrogen is 2.87g/kg, and the total antimony is 632.24 mg/kg.
The large root of the previous season of the white jade bracken is transplanted after being divided into 3 plants in each pot, and a certain amount of compound fertilizer is applied simultaneously, wherein the concentration of nitrogen, phosphorus and potassium elements applied to the soil is 100mg/kg, 80mg/kg and 100 mg/kg.
The test soil, which was sieved with a 10 mesh sieve, was filled into pots, each of which was filled with 2kg of soil. Keeping the culture environment cool and shade, and simultaneously supplementing water to the potted plant according to the water shortage condition, and ensuring the water content in the potted plant to be 70-90% of the field water holding rate.
After the plants are mature, the overground part and the underground part of the plants are respectively sampled, and the collected plant samples are cleaned by tap water and then are cleaned by deionized water. Drying the plant sample in the sun, deactivating enzymes at 105 deg.C for 30min, oven drying at 70 deg.C to constant weight, weighing, pulverizing, and bagging.
The present invention is further illustrated by the following specific examples.
Example 1
Respectively applying saturated CaCO into the potted plants 10 days before the plants are harvested3Water, and control experiments were performed with blanks, each experiment being repeated 3 times.
TABLE 1 different CaCO3Effect on biomass of overground part of plant and content of heavy metal antimony of plant under concentration treatment
As can be seen from Table 1, a certain amount of CaCO was added to the pot culture compared to the blank group3Can obviously change the biomass of the overground part of the plant, the content of the stibium of the overground part of the plant, the absorption amount of the stibium of the overground part of the plant and the repair efficiency. Wherein 1.25 ton/mu CaCO is added3The repairing effect on the soil antimony is optimal, and 1.5 ton/mu of CaCO is added3Can improve the content of the antimony in the overground part of the plant, but can reduce the biomass of the plant, thereby slightly reducing the repair efficiency of the plant on the soil antimony.
Example 2
One fourth of saturated CaCO is respectively applied to the potted plants 15 days before the plants are harvested3Water, and control experiments were performed with blanks, each experiment being repeated 3 times.
TABLE 2 different CaCO3Effect on biomass of overground part of plant and content of heavy metal antimony of plant under concentration treatment
As can be seen from Table 2, a certain amount of CaCO was added to the pots compared to the blank group3Can obviously change the biomass of the overground part of the plant, the content of the stibium of the overground part of the plant, the absorption amount of the stibium of the overground part of the plant and the repair efficiency. Wherein 1.25 ton/mu CaCO is added3The repairing effect on the soil antimony is optimal, and 1.5 ton/mu of CaCO is added3Can improve the content of the antimony in the overground part of the plant, but can reduce the biomass of the plant, thereby slightly reducing the repair efficiency of the plant on the soil antimony.
The foregoing examples are set forth to illustrate the present invention more clearly and are not to be construed as limiting the scope of the invention, which is defined in the appended claims to which the invention pertains, as modified in all equivalent forms, by those skilled in the art after reading the present invention.
Claims (4)
1. The method for repairing the antimony-polluted soil is characterized by comprising the following steps of:
s1, applying an antimony activating agent to antimony-contaminated soil, ploughing and uniformly mixing, keeping the soil flooded by 1-3 cm, planting pteris multifida when a plough layer is still wet after balancing for 3-7 days, keeping the growing environment warm, wet and free of continuous insolation in the whole plant growing process, then harvesting and performing harmless treatment on the pteris multifida after 10-15 days of the most vigorous growth period of the pteris multifida, and irrigating the antimony-contaminated soil with a saturated calcium carbonate solution 10-15 days before harvesting the pteris multifida;
s2, detecting whether the content of heavy metal antimony in the soil repaired in the step S1 reaches the standard, and if not, planting the pteris multifida of the next batch according to the method in the step S1 until the content of antimony in the soil reaches the standard;
the antimony activating agent is calcium carbonate; the application amount of the antimony activator is 1-1.5 tons/mu before the water ploughing measure; the Pteris multifida is white jade Pteris multifida.
2. The method for remediating antimony-contaminated soil as recited in claim 1, wherein in step S1, outdoor cultivation is adopted, regular watering is carried out to keep the soil moist so that the water content of the soil is kept 70-80% of the field water capacity.
3. The method for remediating antimony-contaminated soil as claimed in any one of claims 1-2, wherein harvesting Pteris multifida in step S1 mainly means removing the aerial parts of Pteris multifida.
4. The method for remediating antimony-contaminated soil as recited in any one of claims 1 to 2, wherein the harmless treatment in step S1 includes incineration of pteridium aquilinum, flue gas purification, ash solidification, and landfill.
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| CN107838183B true CN107838183B (en) | 2020-08-07 |
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| CN108746170A (en) * | 2018-07-31 | 2018-11-06 | 杭州绿风生态环境建设集团有限公司 | A kind of method of pteridophyte restoration of soil polluted by heavy metal |
| CN111804727A (en) * | 2020-06-29 | 2020-10-23 | 北京泷涛环境修复有限公司 | Method for treating antimony-polluted soil |
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| AU1237400A (en) * | 1998-10-30 | 2000-05-22 | Carl L. Huff | Method for treatment of heavy metal contamination |
| CN1785538A (en) * | 2005-10-28 | 2006-06-14 | 中山大学 | Method of treating arsenic pollution of solid or water |
| CN104550208A (en) * | 2013-10-12 | 2015-04-29 | 中环循(北京)环境技术中心 | Farmland soil heavy metal pollution restoration method through coupling activating and passivating |
| CN105880270A (en) * | 2016-06-27 | 2016-08-24 | 中冶华天工程技术有限公司 | Heavy metal lead and antimony polluted soil remediation method |
| CN106853459A (en) * | 2017-01-20 | 2017-06-16 | 明志科技大学 | The method that removing heavy metals are removed from soil |
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Patent Citations (5)
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| AU1237400A (en) * | 1998-10-30 | 2000-05-22 | Carl L. Huff | Method for treatment of heavy metal contamination |
| CN1785538A (en) * | 2005-10-28 | 2006-06-14 | 中山大学 | Method of treating arsenic pollution of solid or water |
| CN104550208A (en) * | 2013-10-12 | 2015-04-29 | 中环循(北京)环境技术中心 | Farmland soil heavy metal pollution restoration method through coupling activating and passivating |
| CN105880270A (en) * | 2016-06-27 | 2016-08-24 | 中冶华天工程技术有限公司 | Heavy metal lead and antimony polluted soil remediation method |
| CN106853459A (en) * | 2017-01-20 | 2017-06-16 | 明志科技大学 | The method that removing heavy metals are removed from soil |
Non-Patent Citations (1)
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| 改良剂对锑矿区土壤锑形态和生物可利用性影响的研究;童方平等;《中国农学通报》;20111231(第25期);第25-30页 * |
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Effective date of registration: 20220614 Address after: 410329 Liuyang National Biomedical Industrial Base, Changsha City, Hunan Province (beside National Highway 319) Patentee after: YONKER ENVIRONMENTAL PROTECTION Co.,Ltd. Address before: 410330 the 319 National Road of Liuyang National Economic Development Zone, Changsha, Hunan. Patentee before: Hunan Yonker Environmental Protection Research Institute Co.,Ltd. |