Plant in situ restoring method of cadmium polluted soil

A cadmium-contaminated soil and in-situ restoration technology, applied in the direction of soil lifting machinery, fertilizer mixture, organic fertilizer, etc., can solve problems such as difficult to carry out large-scale polluted soil, soil structure damage, soil activity decline, etc., and achieve good social benefits , beautify the environment, the effect of small amount of work

Inactive Publication Date: 2004-12-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These physical and chemical remediation technologies have their own advantages, but they all have large engineering quantities, high costs, difficulty in large-scale improvement of polluted soil, and easy to cause secondary pollution and lead to soil structure damage, soil activity decline and soil fertility degradation, etc. ecological problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Sedum southeast was transplanted in soils with different levels of cadmium pollution, and nitrogen, phosphorus and potassium fertilizers were applied, and the growth period was managed according to traditional crop management methods. The above-ground parts were harvested 4 months after transplanting. It was determined that under the pollution level of 21.0mg / kg, the dry matter yield of Sedum alfredii was 2141kg / ha, the cadmium content of the above ground was 148mg / kg, and the cadmium taken away from the soil was 0.32kg / ha, which was at 13.0mg / kg. Under the pollution level, the dry matter output of Sedum alfredii was 2586kg / ha, the cadmium content of the above ground was 153mg / kg, and the cadmium taken away from the soil was 0.39kg / ha. It can be seen that there is no significant difference in the ability to remove cadmium from the soil by Sedum in different pollution levels, and it can be applied to the remediation of soil contaminated by cadmium to different degrees.

Embodiment 2

[0017] Transplant Sedum in cadmium-contaminated soil containing 21.15 mg / kg of cadmium, harvest the above-ground parts 4 months after the first transplanting, replenish the seedlings after harvest, and perform the second harvest after 3 months and apply nitrogen, phosphorus and potassium fertilizers And organic fertilizer, during the growth period, it is managed according to traditional crop management methods. After the first harvest, the dry matter yield of Sedum alfredii was 1277kg / ha, the cadmium content of the ground was 193mg / kg, and the cadmium taken away from the soil was 0.21kg / ha. After the second harvest, the yield of Sedum southeast was 3219kg / ha, the cadmium content of the above ground was 181mg / kg, and the cadmium taken away from the soil was 0.58kg / ha. After the two harvests, the soil cadmium content changed from 21.15mg / kg to 20.37mg / kg, which is equivalent to a reduction of 3.69% of the total cadmium in the soil. After that, it will be harvested every 3 months or ...

Embodiment 3

[0019] Sedum sedum was transplanted in cadmium-contaminated soil with cadmium content of 40.3 mg / kg and different pH values. Nitrogen, phosphorus and potassium fertilizers were applied. The growth period was managed according to traditional crop management methods. The above-ground parts were harvested 4 months after transplanting. It has been determined that at a level of 5.0, the dry matter yield of Sedum sedum is 2325kg / ha, the content of cadmium above the ground is 453mg / kg, and the cadmium taken away from the soil is 1053g / ha; under the level of pH 5.5, the cadmium of Sedum sedum is 2325kg / ha. The dry matter yield is 1845kg / ha, the aboveground cadmium content is 477mg / kg, and the cadmium taken away from the soil is 880g / ha; at a pH level of 6.3, the dry matter yield of Sedum alfredii is 1635kg / ha, and the aboveground cadmium The content is 442mg / kg, and the cadmium taken away from the soil is 723g / ha. It can be seen that the cadmium removal ability of Sedum southeast is diffe...

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Abstract

A plant method for in-situ treating the soil polluted by Cd features that the plant Dongnan Jingtian is directly planted in the polluted soil for absorbing the Cd from the soil and after the plant is growing for 3-4 months, it is removed. Its advantages are high effect and speed and no secondary pollution.

Description

Technical field [0001] The invention relates to a method for repairing and treating cadmium contaminated soil. Background technique [0002] Cadmium pollution has become a serious environmental problem. In non-ferrous metal mining and smelting and industrial enterprises that use cadmium-containing raw materials, a large amount of cadmium is discharged into the environment through the "three wastes" every year, and 82%-94% of the cadmium discharged into the environment enters the soil, and a considerable part of it is agricultural Soil, my country's soil cadmium pollution area is becoming more and more serious. The cadmium content in farmland soil in some sewage irrigation areas is as high as 130mg / kg, which is hundreds of times higher than natural soil. Wastewater, waste gas, sludge and other cadmium-containing substances discharged by industrial and mining enterprises are the main sources of cadmium entering the soil. Cadmium is stable, accumulated and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01B77/00C05F11/00C05G3/80
Inventor 杨肖娥李廷强叶海波
Owner ZHEJIANG UNIV
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