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Remediation method for acid heavy metal contaminated soil

A remediation method, a technology for polluted soil, applied in the restoration of polluted soil, etc., to achieve the effect of low cost, low water and fertilizer management requirements, and high maintainability

Inactive Publication Date: 2012-01-04
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-yield, low-cost method for remediating acidic polymetallic contaminated soil using Jatropha curcas for the deficiencies in the existing phytoremediation technology for acidic polymetallic contaminated soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 Screening of acid polymetallic tolerant energy plants

[0016] According to the literature reports and the preliminary experiments of the research group, combined with the natural conditions, pollution degree and restoration potential of the Dabaoshan mining area, five energy plants of jatropha curcas, tung tree, castor, sunflower and camellia oleifera were selected as test materials. The metals were artificially added for culture, and the root length, root weight, fresh weight, biomass, photosynthetic rate and other indicators were selected to comprehensively judge the tolerance of the five energy plants. -1 ) and Cd (400 mg·kg -1 ) tolerance; Tung tree and camellia oil to Al (3000 mg·kg -1 ), Cu (600 mg·kg -1 ) and Zn (2000 mg·kg -1 ) has strong tolerance; Jatropha curcas has strong tolerance to Al, Cd, Pb, Cu and Zn.

Embodiment 2

[0017] Example 2 Verification of indoor potted plants

[0018] In March 2009, the acidic polymetallic contaminated soil was collected from the Dabaoshan wasteland and transported back to the laboratory, and the restoration potential of Jatropha curcas was verified by pot experiments indoors. Tolerance verification is carried out according to three pollution gradients of low pollution, medium pollution and high pollution. The results after one year showed that Jatropha curcas can grow well in soils with low, medium and high pollution levels.

Embodiment 3

[0019] Example 3 Dabaoshan Site Restoration

[0020] After leveling the acidic polymetallic polluted soil, transplant Jatropha curcas seedlings with a height of 30 cm, and plant 280-300 trees per mu. Water when planting, and no special management is required later.

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Abstract

The invention discloses a remediation method for an acid heavy metal contaminated soil. The method mainly uses a botanical Jatropha curcas which has outstanding tolerance to extreme soil environments featured by high-concentration heavy metal residuals, being lacking of so many nutrient elements, having poor soil texture and the like; and in the method, seedlings are transferred in the contaminated place for field planting after starting seeds indoors so as to steadily remedy the contaminated soil. After being remedied by the Jatropha curcas, pH of the soil is improved, biological available heavy metal is greatly reduced, and harm for the environment is greatly relieved, so that the method has obvious ecological benefits. And simultaneously, production value per mu of bioenergy in each year is at least RMB 2850 yuan, so that the method has obvious economic benefits.

Description

[0001] technical field [0002] The invention relates to a repair method for acid polymetallic polluted soil. Background technique [0003] Mine mining produces a large amount of sulfur-containing waste and tailings. These wastes are chemically and biologically oxidized to produce sulfuric acid, which in turn dissolves a large amount of toxic metal ions, causing large-scale environmental pollution and ecological damage around the mining area and watershed. This not only caused a large reduction in regional agricultural production, but more seriously, a large amount of toxic heavy metals seriously threatened human health through the food chain due to their unique bioaccumulation effect, forming a wider food safety problem. At present, the most fundamental solution is to control and repair contaminated soil from metal mines from the source. Among them, the plant stabilization technology is recognized as having unique advantages: it uses soil amendments to assist plants to fix ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 仇荣亮王诗忠李清飞吴启航郑涵柏珺战树顺
Owner SUN YAT SEN UNIV
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