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Method for remediating heavy metal polluted soil comprehensively

A technology of polluted soil and remediation method, which is applied in the field of comprehensive remediation of heavy metal-contaminated soil, can solve problems such as unsuitable for large-scale contaminated soil treatment, unsatisfactory phytoremediation effect, hidden danger of secondary pollution, etc., to achieve easy large-scale promotion, good Environmentally friendly, low-cost effect

Inactive Publication Date: 2016-02-03
苗庆龄
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The engineering measures used for soil heavy metal pollution, such as alien soil method, soil replacement method, deep plowing method, solidification, stabilization method, electrodynamic restoration method, etc., have the advantages of stability and quick results, but there are problems such as large amount of engineering, high investment cost, Disadvantages such as hidden dangers of secondary pollution are not suitable for the treatment of large-scale polluted soil
Phytoremediation of soil heavy metal pollution is very unsatisfactory

Method used

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  • Method for remediating heavy metal polluted soil comprehensively

Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 A comprehensive remediation method for heavy metal contaminated soil, the steps are as follows:

[0027] (1) Select the heavy metal contaminated soil to be repaired, manually remove weeds and shrubs, apply adequate decomposed organic fertilizers at a rate of 400 kg / mu in late autumn and early winter, and deep plow 35 cm to weather the soil and freeze overwintering pests. The land is ploughed and broken;

[0028] (2) In spring, when the average temperature of the soil is above 10℃ after thawing, transplant the woody fast-growing tree Paulownia white flower with the ability to accumulate heavy metals. The annual seedlings of Paulownia white flower are transplanted by the method of inter-row hole planting, the row spacing is 2.5 meters, the plant spacing is 1.2 meters, and the holes are digging and planting. The hole diameter is 0.5 meters and the hole depth is 0.4 meters. After transplanting, irrigate once permeable to make the roots of the seedlings and the soil m...

Embodiment 2

[0032] Example 2 A comprehensive remediation method for heavy metal contaminated soil, the steps are as follows:

[0033] (1) Select the heavy metal contaminated soil to be repaired, manually remove weeds and shrubs, apply adequate decomposed organic fertilizers at an amount of 800 kg / mu in late autumn and early winter, and deep plow 55 cm to weather the soil and freeze the overwintering pests. The land is ploughed and broken;

[0034] (2) In spring, when the average temperature of the soil is above 10℃ after thawing, transplant the woody fast-growing tree Paulownia white flower with the ability to accumulate heavy metals. The annual seedlings of Paulownia white flower are transplanted by the method of inter-row hole planting, the row spacing is 3.5 meters, the plant spacing is 1.8 meters, and the hole diameter is 0.8 meters and the hole depth is 0.6 meters. After transplanting, irrigate once permeable to make the roots of the seedlings and the soil more closely, cultivate a thin...

Embodiment 3

[0038] Example 3 A comprehensive remediation method for heavy metal contaminated soil, the steps are as follows:

[0039] (1) Select the heavy metal contaminated soil to be repaired, manually remove weeds and shrubs, apply sufficient decomposed organic fertilizers at an amount of 600 kg / mu in late autumn and early winter, and deep plough 45 cm to weather the soil and freeze overwintering pests. The land is ploughed and broken;

[0040] (2) In spring, when the average temperature of the soil is above 10℃ after thawing, transplant the woody fast-growing tree Paulownia white flower with the ability to accumulate heavy metals. The annual seedlings of Paulownia white flower are transplanted by the method of alternate-row hole planting, with a row spacing of 3 meters and a plant spacing of 1.5 meters. The holes are digged for colonization with a hole diameter of 0.6 meters and a hole depth of 0.5 meters. After transplanting, irrigate once permeable to make the roots of the seedlings an...

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Abstract

The invention discloses a method for remediating heavy metal polluted soil comprehensively. A comprehensive plant remediation technology for combining woody fast-growing tree paulownia elongate with an obvious fixing effect to multiple kinds of heavy metals including Cu, Pb, Cd, Zn and herbaceous plant elsholtzia splendens with hyperaccumulation effect and rapid growth speed to Cu<2+> is adopted, and meanwhile an animal (earthworm) remediation technology is assisted so as to reach an effect of removing soil heavy metal pollution maximally, so that the in-situ bioremediation to soil is realized; moreover, pollutants are effectively prevented from entering a food chain directly so as not to generate secondary pollution to soil. The method is a comprehensive remediation method of heavy metal contaminated soil, which has good environment friendliness, is low in cost, has an obvious effect to the remediation of heavy metal contaminated soil, can enhance the fertility of the heavy metal contaminated soil, and is easy to popularize in a large area.

Description

[0001] Divisional application, original application number 2014105572666, application date 2014.10.21, titled a comprehensive restoration method for heavy metal-contaminated soil. technical field [0002] The invention relates to the field of soil restoration methods, in particular to a comprehensive restoration method for heavy metal polluted soil. Background technique [0003] With the rapid development of the global economy, pollutants containing heavy metals enter the soil through various channels, resulting in the enrichment of corresponding heavy metal elements in the soil. Soil pollution not only affects the yield and quality of agricultural products, but also involves the quality of the atmosphere and water environment, and can endanger the life and health of animals and humans through the food chain. That is to say, soil pollution affects the quality of human existence as a whole. At present, there are mainly two ways to control soil heavy metal pollution at home an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
CPCB09C1/00B09C1/10B09C1/105B09C2101/00
Inventor 不公告发明人
Owner 苗庆龄
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