Method for repairing heavy metal pollution of farmland in lead-zinc copper mining area

A technology of heavy metal and copper pollution, applied in the restoration of polluted soil, etc., can solve the problem of difficult to comprehensively remove various pollutants in soil, and achieve the effect of preventing root residues

Inactive Publication Date: 2018-08-10
WUYI UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Heavy metal-enriching plants have a certain selectivity for heavy metals, that is, they generally only have tolerance and enrichment capacity for one heavy metal. However, soil heavy metal pollution is mostly compound pollution of several heavy metals, and it is difficult to use plants that only enrich one kind of heavy metal. Removes multiple pollutants from the soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1 Soil remediation test in mining area

[0012] The plantain and cocoa collected from the mining area were alternately planted in the tailings slag soil with the average contents of heavy metal zinc, lead and copper in the mining area soil of 526mg·kg-1, 650 mg·kg-1 and 225mg·kg-1 respectively Above, 20 rows were planted, 20 plants in each row, and the spacing between the rows was 20cm. Fertilizers were applied once in the 6-leaf stage and the tillering stage respectively. The fertilizers used were urea, superphosphate and potassium chloride, and the fertilizers used were urea, superphosphate and Potassium chloride, two times of fertilization to ensure a total of 120kg / hm2 of pure nitrogen, 30 kg / hm2 of pure phosphorus and 40kg / hm2 of pure potassium, and watering twice a month. The whole plant is harvested before it reaches maturity, and it is ashed.

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Abstract

The invention discloses a method for repairing heavy metal pollution of a farmland in a lead-zinc copper mining area. The method is to alternately plant plantain herb and syngonium podophyllum in heavy metal-polluted farmland soil where the plants are widely distributed; heavy metals are absorbed and accumulated by using the enrichment characteristic of the plants for the heavy metals such as lead, zinc and copper, and are mostly transferred to overground parts of the plants; the whole plants are harvested before maturity to prevent roots from being maintained; and the plants are ashed to extract the heavy metals, so as to fulfill the aim of repairing the heavy metal-lead, zinc and copper-pollution in the farmland in the lead-zinc copper mining area. As the plantain herb and the syngoniumpodophyllum are vigorous and have large biomasses, the plantain herb is suitable for growing in a dry land, and the syngonium podophyllum can be cultivated in a wet land; seasonal differences can be effectively avoided; and therefore, application of the plantain herb and the syngonium podophyllum to repairing the heavy metal-lead, zinc and copper-polluted farmland is fast, low in cost and high inrepairing potential.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal pollution in farmland environment in mining areas, that is, a method for repairing heavy metal-polluted farmland by alternately planting plantain and syringa japonica, in particular to a method for remediating heavy metal pollution in lead-zinc-copper mining area farmland. Background technique [0002] In recent years, heavy metal pollution incidents have occurred frequently, such as Hg pollution (Minamata disease) and Cd pollution (osteopathy) in Japan, etc. With rapid economic development and improved quality of life, people are very concerned about heavy metal pollution. Heavy metal refers to its atomic density greater than 5g / cm 3 A class of metal elements mainly include: Cr, Cd, Hg, Cu, Zn, Pb, Sn, Ag, etc., there are about 40 kinds. Heavy metal pollutants have the characteristics of easy accumulation, refractory degradation and high toxicity. Soil or water bodies are the...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B09C1/10
CPCB09C1/105B09C2101/00
Inventor刘敏超周武
OwnerWUYI UNIV