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Method for restoring heavy metal-polluted soil of mine and farming land

A technology for agricultural land and heavy metals, applied in the field of soil remediation, can solve the problems of high growth environment requirements, limited plant species, poor absorption effect, etc., and achieve the effect of easy promotion, low cost, and significant absorption and enrichment effect.

Inactive Publication Date: 2016-11-16
赵月
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These existing plants used for soil remediation of heavy metals, on the one hand, may have disadvantages such as poor absorption effect, slow growth, and high requirements on the growth environment. On the other hand, the existing reported plant species are limited. and degree of aggravation, it is necessary to further develop new and more effective plant varieties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In a mining area in Leshan City, Sichuan Province and the surrounding agricultural land within 10 kilometers, the mountain whip is planted at a planting density of 10 plants per square meter. After the aerial part of the mountain whip has withered, the above-ground part is harvested, dried and crushed, and extracted and separated. heavy metals, and then carry out the determination of heavy metal content.

[0019] The present invention uses the bioaccumulation coefficient to evaluate its ability to absorb and enrich heavy metals. The bioaccumulation coefficient refers to the ratio of the element content of a certain part of the plant to the corresponding element content in the soil, and is a measure of the heavy metal accumulation capacity of the plant. An important indicator, the larger the enrichment coefficient, the stronger the enrichment ability. The enrichment factor of the present invention is the mass percentage content ratio of the heavy metal in the aerial part...

Embodiment 2

[0022] In a mining area of ​​Leshan City, Sichuan Province and the surrounding agricultural land within 10 kilometers, the mountain whip is planted at a planting density of 10 plants per square meter, and rice straw ash is sown at the seedling stage of the mountain whip at a rate of 0.5kg / m 2 , after the aboveground part of the mountain whip is withered, the aboveground part is harvested, dried and crushed, and the heavy metals are extracted and separated, and then the content of the heavy metals is determined;

[0023] The method of Example 1 is used for determination. In this example, the enrichment factor for cadmium (Cd) is 3.99, the enrichment factor for lead (Pb) is 3.53, the enrichment factor for mercury (Hg) is 2.65, and the enrichment factor for nickel is 3.99. The enrichment coefficients of (Ni) and zinc (Zn) are 1.79 and 1.89 respectively; the heavy metal content of the dry aerial part: cadmium (Cd) is 393.55 mg / kg, lead (Pb) is 176.57 mg / kg, mercury (Hg) It is 99.3...

Embodiment 3

[0025] In a mining area of ​​Leshan City, Sichuan Province and the surrounding agricultural land within 10 kilometers, the mountain whip is planted at a planting density of 10 plants per square meter, and rice straw ash is sown at the seedling stage of the mountain whip at a rate of 0.5kg / m 2 , Harvest the above-ground parts at the fruit ripening stage, dry and pulverize, extract and separate the heavy metals, and then carry out the determination of the heavy metal content.

[0026] Using the method of Example 1 to measure, the enrichment coefficient of this embodiment to cadmium (Cd) is 4.13, the enrichment coefficient to lead (Pb) is 3.61, the enrichment coefficient to mercury (Hg) is more than 2.69, and the The enrichment coefficients of nickel (Ni) and zinc (Zn) are 1.81 and 1.89 respectively; the heavy metal content in the dry aerial part: cadmium (Cd) is 397.51 mg / kg, lead (Pb) is 179.63 mg / kg, mercury (Hg ) was 99.93 mg / kg, nickel (Ni) and zinc (Zn) were 70.61 mg / kg and...

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PUM

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Abstract

The invention discloses a method for restoring heavy metal-polluted soil of a mine and a farming land, and belongs to the field of environment protection and soil restoration. The method is to plant hypericum attenuatum in the soil of the mine and the farming land. By the adoption of a mode of planting the hypericum attenuatum in the soil of the mine and the farming land, heavy metals are absorbed and enriched; and the enrichment coefficient of cadmium (Cd) is 3.5 or above, the enrichment coefficient of plumbum (Pb) is 2.9 or above, the enrichment coefficient of mercury (Hg) is 1.9 or above, and the enrichment coefficient of nickel (Ni) and zinc (Zn) is 1.3 or above. The method has the outstanding heavy metal absorption and enrichment effect, is low in cost and easy to operate and popularize, and has remarkable environment-friendly and social benefits.

Description

technical field [0001] The invention relates to the field of soil remediation, in particular to a method for remediating soil heavy metal pollution in mines and agricultural land. Background technique [0002] Heavy metal pollution generally refers to excessive levels of mercury (Hg), cadmium (Cd), lead (Pb), nickel (Ni), and zinc (Zn) in soil. The reasons mainly include the continuous mining of mines, the discharge of waste water and slag from the non-ferrous metallurgical industry, the discharge of three industrial wastes, and so on. [0003] Heavy metals are widely distributed in the atmosphere, water, soil, and organisms, and sediment is often the storage and final destination of heavy metals. When the environment changes, the form of heavy metals in the sediment will be transformed and released to cause pollution. Heavy metals cannot be biodegraded, but are bioaccumulative, and enter the human body through soil, plants, and crops, causing great danger to human health....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
CPCB09C1/105
Inventor 不公告发明人
Owner 赵月
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