Green plant remediation method for heavy metal contaminated soil

A technology of polluted soil and restoration method, applied in the restoration of polluted soil, etc., can solve the problems of occupying cultivated soil and restricting the development of other farming operations, and achieve the effect of alleviating land use conflicts, reducing the risk of secondary pollution, and high restoration efficiency.

Active Publication Date: 2018-01-19
CCCC SECOND HIGHWAY ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, seedling planting has become an important agricultural industry in recent years, occupying a large area of ​​cultivated soil and limiting the development of other farming operations

Method used

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  • Green plant remediation method for heavy metal contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A green plant restoration method for heavy metal polluted soil, specifically consisting of the following steps:

[0033] (1) Select a lead-zinc tailings area in Zhejiang near 280m north, the soil is sandy loamy alluvial soil, the organic matter of the heavy metal-polluted soil is 31.8g / kg, the content of alkaline nitrogen is 190mg / kg, and the content of available phosphorus is 34.5mg / kg , The available potassium content is 195mg / kg, the total soil Cu content is 550mg / kg, and the total soil Pb content is 750mg / kg. Drainage ditches are set up on the heavy metal contaminated soil, and green belts are planted along both sides of the drainage ditch;

[0034] (2) the soil of described green belt is loosened, is divided into three districts after being applied into the organic fertilizer, and one district is planted Phnom Penh boxwood seedling green belt, planted along the gutter side; Two districts plant Pittosporum seedling green belt, along Phnom Penh boxwood Seedling green...

Embodiment 2

[0041] A green plant restoration method for heavy metal polluted soil, specifically consisting of the following steps:

[0042] (1) The soil near 350m north of a lead-zinc tailings area in Zhejiang is selected. The soil is sandy loamy alluvial soil. The organic matter of the heavy metal-polluted soil is 29.5g / kg, the content of alkaline nitrogen is 168mg / kg, and the content of available phosphorus is 26.9mg / kg , The available potassium content is 178mg / kg, the total soil Cu content is 480mg / kg, and the total soil Pb content is 650mg / kg. Drainage ditches are set up on the heavy metal contaminated soil, and green belts are planted along both sides of the drainage ditch;

[0043] (2) the soil of described green belt is loosened, is divided into three districts after being applied into the organic fertilizer, and one district is planted Phnom Penh boxwood seedling green belt, planted along the gutter side; Two districts plant Pittosporum seedling green belt, along Phnom Penh boxwoo...

Embodiment 3

[0050] This embodiment is consistent with other process parameters of embodiment 1, the difference is:

[0051] The soil below the green belt is also provided with a filler layer, and the filler layer is composed of a montmorillonite layer, a limestone layer and a modified perlite layer arranged successively from bottom to top; the thickness of the filler layer is 20cm, and the thickness of the heavy metal-contaminated soil layer It is 50cm.

[0052] The preparation method of the modified perlite in the modified perlite layer is as follows: grind the perlite, pass through a 100-mesh sieve, soak in the modified solution for 10 hours, heat to 90°C while stirring, react at a constant temperature for 3 hours, and filter The obtained solid matter is washed with water until the pH of the washing liquid is 6.5, and then the washed solid matter is dried at 65° C. to obtain the modified perlite. The modifying solution is prepared by mixing the following raw materials in parts by weigh...

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Abstract

The invention discloses a green plant remediation method for heavy metal contaminated soil. The green plant remediation method is composed of the following steps that (1), a drainage ditch is formed in the heavy metal contaminated soil, and green belts are planted along the two sides of the drainage ditch; (2) soil of each green belt is scarified, and divided into three areas after organic fertilizer is applied in, specifically, the first area is used for planting an euonymus japonicas belt along the side of the drainage ditch, the second area is used for planting a pittosporum tobira belt along the euonymus japonicas belt, and the third area is used for planting a cupressaceae belt along the pittosporum tobira belt; (3) an organic adsorption agent is added to the soil of the green belts;and (4) the water holding ratio of the soil of the green belts is maintained as 55-60%, and the whole trees of pittosporum tobira, euonymus japonicas and cupressaceae are dug out and transplanted after being planted for 9-12 months, 11-15 months and 14-17 months respectively. The green plant remediation method is environmentally friendly, eco-friendly, low in maintenance cost and good in remediation effect, provides economic benefits for planting businessmen, saves remediation funds for the government, and is worth being applied and popularized.

Description

technical field [0001] The invention relates to the technical field of soil restoration, in particular to a green plant restoration method for heavy metal polluted soil. Background technique [0002] Soil heavy metal pollution has become a major environmental problem in China and even the world. Heavy metal ions are generally not biodegradable. The heavy metal content in the soil is too high, which directly pollutes the agricultural products planted in the soil near the mining area. The contaminated agricultural products enter the organism through the food chain and other channels. Enrichment will ultimately affect regional ecological balance and population health. At present, more than 20 million hectares of arable land in my country have been polluted by heavy metals, and the need for treatment is extremely urgent. In addition, seedling planting has become an important agricultural industry in recent years, occupying a large area of ​​cultivated soil and limiting the deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/00
Inventor 李伟东江霞杨华云孙燕刘奇王磊
Owner CCCC SECOND HIGHWAY ENG CO LTD
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