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Restoration technology of cadmium-polluted soil

A cadmium-contaminated soil technology, applied in the restoration of contaminated soil, etc., can solve the problems of high energy consumption, secondary pollution, damage to the living environment of plants and microorganisms, etc., and achieves the advantages of convenient operation, strong pertinence, and low investment Effect

Inactive Publication Date: 2015-01-07
CHANGZHOU UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

After cadmium enters the soil ecosystem, it will destroy the living environment of plants and microorganisms, resulting in a decline in soil quality, which poses a threat to crop yield and quality. Therefore, the research and treatment of soil cadmium pollution is urgent
[0003] The remediation technologies of cadmium-contaminated soil mainly include physical remediation methods, chemical leaching, guest-soil method, phytoremediation, etc., but there is still no fully mature technology
The physical restoration method is more efficient, but it consumes a lot of energy, and the soil organic matter and water will be damaged to varying degrees; the chemical restoration method can not only perform in-situ restoration, but also can be used for off-site restoration, but it is prone to secondary pollution and endangers soil ecology again. Safety

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] In a cadmium-contaminated site in Changzhou City, Jiangsu Province, the depth of soil pollution was 2 meters according to laboratory tests, and it was planned to be repaired three times. Apply aerobic composted household garbage on the polluted site with a thickness of 0.05 meters, and plow the polluted site to be repaired with a depth of 0.7 meters each time; divide the polluted site to be repaired into 5 blocks, In the process of plowing, soil chelating agents that promote the absorption and accumulation of cadmium by plants are applied, among which ethylenediaminetetraacetic acid (EDTA) is applied to 2 plots, ethylene glycol bistetraacetic acid (EGTA) is applied to 2 plots, and ethylene glycol bistetraacetic acid (EGTA) is applied to 1 plot. Aminotriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA), ethylene glycol bistetraacetic acid (EGTA) and aminotriacetic acid (NTA) are applied at a rate of 5 mmol / (kg m 2 ), applied in the form of liquid spraying; five p...

Embodiment 2

[0025] The experiment was carried out at the experimental site of Changzhou University. The contaminated soil of the experiment was taken from a chemical polluted site in Changzhou City. The experimental site was 3 pieces with a size of 1 m x 1 m x 0.6 m. Garbage, the application thickness is 0.05 meters, and the soil chelating agent ethylenediaminetetraacetic acid (EDTA) that promotes the absorption and accumulation of cadmium by plants is applied. The application rates of the three plots are: 1, 5, 7mmol / (kg m 2 ), plant hollyhock on the experimental site, harvest the plants after 50 days of plant growth, analyze the cadmium content in the roots, stems and leaves of the plants, and screen out the soil chelating agent ethylenediamine that promotes the excessive absorption and accumulation of hollyhock to cadmium The optimal dosage of tetraacetic acid (EDTA) is 5mmol / (kg·m 2 ).

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Abstract

The invention relates to a restoration technology of cadmium-polluted soil. The restoration technology comprises the following steps of: applying domestic garbage treated by aerobic composting on a polluted site to be restored; ploughing the polluted site to be restored, and applying different types of soil chelating agents for promoting absorption and accumulation of plants for cadmium in the ploughing process; and planting different types of plants, harvesting, analyzing the content of cadmium at the roots, stems and leaves of the plants, and screening out the plant variety and the soil chelating agent with over absorption and largest accumulation of cadmium. The restoration technology has the advantages that polluted industrial sites are restored, the restored industrial sites can be used as building lands, greening lands and partial non-edible farmlands, and simultaneously, the difficulties of treatment and disposal for the domestic garbage generated in the process of city development are partially solved.

Description

technical field [0001] The invention relates to the technical field of treatment of heavy metal-contaminated soil, in particular to a restoration technology of cadmium-contaminated soil. Background technique [0002] In recent years, with the rapid growth of population, the rapid development of the electrolysis industry, and the extensive use of pesticides and fertilizers in agricultural production, the soil contaminated by cadmium has continued to increase. Contaminated industrial sites. After cadmium enters the soil ecosystem, it will destroy the living environment of plants and microorganisms, cause soil quality to decline, and pose a threat to crop yield and quality. Therefore, the research and treatment of soil cadmium pollution is urgent. [0003] The remediation technologies of cadmium-contaminated soil mainly include physical remediation methods, chemical leaching, guest-soil method, phytoremediation, etc., but there is still no fully mature technology. The physica...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
Inventor 万玉山陈艳秋黄利李定龙杨彦
Owner CHANGZHOU UNIV
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