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Comprehensive heavy metal contaminated soil remediation method

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

Active Publication Date: 2015-01-21
武汉文科生态环境有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 A comprehensive remediation method for heavy metal contaminated soil, the steps are as follows:

[0026] (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;

[0027] (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 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 more closely, cultivate a thin layer o...

Embodiment 2

[0031] Example 2 A comprehensive remediation method for heavy metal contaminated soil, the steps are as follows:

[0032] (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;

[0033] (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

[0037] Example 3 A comprehensive remediation method for heavy metal contaminated soil, the steps are as follows:

[0038] (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;

[0039] (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. After transplanting, irrigate once permeable to make the roots of the seedlings and the soil more closely, cultivate a thin layer of soil immediately after irrigation to prevent soil comp...

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Abstract

The invention discloses a comprehensive heavy metal contaminated soil remediation method. A comprehensive phytoremediation technology combining woody fast-growing tree paulownia elongate with an obvious effect of fixing multiple heavy metals such as Cu, Pb, Cd and Zn and herbaceous plant Elsholtzia splendens with hyperaccumulating effect and high growth speed on Cu2+ is adopted, and an auxiliary animal (earthworm) restoration technology is used, so that the highest effect of eliminating heavy metal pollution of soil is achieved, in situ bioremediation of the soil is successfully realized, pollutants are effectively prevented from directly entering a food chain, and secondary pollution of the soil is avoided. The comprehensive heavy metal contaminated soil remediation method disclosed by the invention is environment-friendly, low in cost and easy to popularize in large area, has an obvious effect of remediating the heavy metal contaminated soil and can improve the fertility of the heavy metal contaminated soil.

Description

technical field [0001] The invention relates to the field of soil restoration methods, in particular to a comprehensive restoration method for heavy metal polluted soil. Background technique [0002] 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 and abroad: one is the activation method, which increases the solubility and mobility of heavy metals in the soil, and recycles them to reduce the content of heavy metals in the soil; ...

Claims

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Application Information

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IPC IPC(8): B09C1/00
CPCB09C1/00B09C1/10B09C1/105B09C2101/00
Inventor 苗庆龄
Owner 武汉文科生态环境有限公司
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