Heavy metal contaminated soil conditioner and plant and chemistry combined remediation method

A contaminated soil improvement and contaminated soil technology, applied in the field of heavy metal contaminated soil conditioner and heavy metal contaminated soil plant and chemical joint remediation, can solve the problem of poor remediation ability of deep groundwater pollution, restricting large-scale commercial application and large-scale promotion, and resisting It can prevent pollution from directly entering the food chain, is conducive to large-scale commercial application, and has good environmental friendliness.

Active Publication Date: 2010-06-09
广东华农大城市规划设计院有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) At present, most of the hyperaccumulative plants used for soil remediation have short plants, low biomass, low disease resistance and natural disaster resistance, slow growth and long cycle, so the remediation efficiency and rate are low. It is difficult to obtain good economic benefits under the technical level, which limits large-scale commercial application and large-scale promotion
[0007] (2) In the hyperaccumulation experimental plants, generally a plant can only tolerate or absorb one or two heavy metal elements within a certain concentration range, and show some symptoms of poisoning to other heavy metals with higher concentrations in the soil, Therefore, the application o...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Remediation of acidic heavy metal-contaminated soil in southern my country: taking the soil in the mine and mine water heavy metal-polluted area of ​​Dabaoshan District in northern Guangdong as a pilot, and the remediation and improvement of soil in the light heavy metal-polluted area:

[0035] 1. Determination of soil pH 3.86, titratable acidity 1.0911mmol kg -1 , water-soluble (water-extracted) heavy metal copper content 1.2345mg kg -1 , lead content 0.3865mg·kg -1 , cadmium content 0.0173mg·kg -1 , to determine soil acidity and heavy metal activity;

[0036] 2. Add acidic soil improver in the above-mentioned soil with the amount of 75kg / mu, the mode of taking can be conventional sowing, and described acidic soil improver is the mixture that weight percent is 80% red mud and 20% slaked lime, Adjust soil pH and balance for 14 days;

[0037] 3. Plant Yuetang 94-128 sugarcane variety in the balanced soil, the planting density is: 6000-6500 plants / mu, plant 6 double-s...

Embodiment 2

[0041] Remediation of acidic heavy metal-contaminated soil in heavy metal-polluted areas in southern China:

[0042] 1. Determination of soil pH 4.03, titratable acidity 1.1138mmol kg -1 , water-soluble (water-extracted) heavy metal copper content 4.5137mg kg -1 , lead content 0.2712mg·kg -1 , cadmium content 0.0558mg·kg -1 , to determine soil acidity and heavy metal activity;

[0043] 2. Add acidic soil improver in the above-mentioned soil with the amount of 80kg / mu, the mode of taking can be conventional sowing, and described acidic soil improver is the mixture that weight percent is 85% red mud and 15% slaked lime, Adjust soil pH and balance for 10 days;

[0044] 3. Carry out crop rotation of energy sugarcane and super tired plant Sedum sedum in the balanced soil;

[0045]4. After harvesting, the soil pH is 6.25, and the titratable acidity is 0.3159mmol·kg -1 , water-soluble heavy metal content copper is 0.5146mg·kg -1 ; Lead is 0.0416mg·kg -1 ;Cadmium is 0.0731mg·k...

Embodiment 3

[0047] Soil improvement and restoration in northern heavy metal polluted areas (mild heavy metal polluted areas):

[0048] 1. Determination of soil pH 4.97, titratable acidity 0.9146mmol kg -1 , water-soluble (water-extracted) heavy metal copper content 1.1728mg·kg -1 , lead content 0.3251mg·kg -1 , cadmium content 0.01547mg·kg -1 , to determine soil acidity and heavy metal activity;

[0049] 2. Add the acidic soil improver in the above-mentioned soil with the amount of 70kg / mu, the mode of taking can be conventional sowing, and described acidic soil improver is the mixture that weight percent is 90% red mud and 10% slaked lime, Adjust soil pH and balance for 7 days;

[0050] 3. Carry out soybean, sweet sorghum or soybean-sweet sorghum intercropping in balanced soil, sweet sorghum planting density is 5000~6000 plants / mu, row spacing 0.2×0.7 meters; soybean planting density is 10000~15000 plants / mu mu.

[0051] 4. After harvesting, the measured soil pH is 6.35, and the ti...

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PUM

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Abstract

The invention discloses a heavy metal contaminated soil conditioner and a plant and chemistry combined remediation method. The heavy metal contaminated soil conditioner is a mixture of red mud and slaked lime. In the invention, the plant and chemistry combined remediation method is used, the pH of the soil is regulated by a chemical method, and heavy metals in the soil are absorbed by planting energy crops, hyperaccumulative plants and the like, thereby improving the soil properties, gradually reducing the content of heavy metals in the soil, finally achieving the purpose of soil remediation, improving the plant remediation efficiency, and being favorable to large-scale commercial application.

Description

technical field [0001] The invention belongs to the technical field of remediation of resources and environment, and in particular relates to a heavy metal-contaminated soil improver and a plant and chemical combined remediation method for heavy metal-contaminated soil. Background technique [0002] my country is rich in mineral resources, and the soil pollution caused by mining development is large and widespread, and the damage and pollution to the natural ecological environment are becoming more and more serious. It is a problem that cannot be ignored in the treatment of contaminated soil in our country. In particular, the reproduction mechanism of polluted soil in mining areas, the law of pollutant migration, and the goals and directions of treatment are different from ordinary polluted soil. Therefore, the ecological restoration of mines is becoming more and more important. The research on the restoration technology of heavy metal-contaminated soil in mining areas is It...

Claims

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Application Information

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IPC IPC(8): C09K17/06B09C1/00
Inventor 陈晓阳谢君林初夏马迎群陈国涛卢文州黄少伟梁计南
Owner 广东华农大城市规划设计院有限公司
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