A Phytoremediation Method for Severely Contaminated Farmland with Cadmium and Lead

A technology for phytoremediation and lead pollution, applied in the restoration of polluted soil and other directions, can solve the problem of lack of research on phytoremediation of farmland with severe heavy metal pollution, and achieve the effect of solving ecological risks, stabilizing heavy metals, and promoting timely renewal.

Active Publication Date: 2022-06-14
SUN YAT SEN UNIV
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Problems solved by technology

However, there is a lack of research on phytoremediation of farmland heavily polluted by heavy metals

Method used

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  • A Phytoremediation Method for Severely Contaminated Farmland with Cadmium and Lead
  • A Phytoremediation Method for Severely Contaminated Farmland with Cadmium and Lead
  • A Phytoremediation Method for Severely Contaminated Farmland with Cadmium and Lead

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Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0031] Selection of contaminated soil: The experiment adopted the field field experiment, the test land was the village of Xingping Town, Yangshuo County, Guilin, Guangxi Province, the average cadmium and lead pollution content of the farmland were 2mg / kg and 600mg / kg, respectively, and the proportion of cadmium lead exceeding GB 15618-2018 Soil Environmental Quality Standards for soil pollution risk screening values (0.3mg / kg and 70-80mg / kg) in agricultural land was 71.6% and 59.6%, respectively. Most of the topsoil pH is acidic or weakly acidic.

[0032] Phytoremediation methods for heavily cadmium lead-contaminated farmland:

[0033] (1) Apply the passivator evenly at 20 cm of the surface layer of the contaminated soil, plough and beat the field, so that the passivation agent is fully mixed with the soil. Wherein, the passivation agent of Example 1 and Example 3 adopts 0.5% coconut shell biochar, and the passivation agent of Example 2 and Example 4 uses 0.5% coconut shell biochar...

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Abstract

This application belongs to the technical field of farmland restoration polluted by heavy metals. The application provides a phytoremediation method for heavily cadmium-lead polluted farmland. Firstly, passivating agents are applied to heavily cadmium-lead-contaminated farmland soils to reduce the bioavailability, migration and transformation capabilities, and ecotoxicity of heavy metal elements in the soil, and then plant herbaceous fiber crops with heavy metal tolerance in the passivated soil for deactivation. Cultivate, stabilize the heavy metals in the soil, improve the restoration effect, and avoid further harm caused by the diffusion of heavy metals to the surrounding environment. The phytoremediation method of the present application is based on plant stabilization technology, which solves the current ecological risk problem of heavy cadmium and lead pollution of farmland, and retains the underground parts of perennial herbaceous fiber crops in heavy heavy metal polluted soil, which can continue to play the role of stabilizing heavy metals in the soil. Remediation is sustainable and economically beneficial while remediating the soil.

Description

Technical field [0001] The present application belongs to the field of heavy metal pollution farmland remediation technology, in particular involving a phytoremediation method of heavily cadmium lead contaminated farmland. Background [0002] With the rapid development of urbanization, industry and agriculture in recent years, and the continuous expansion of human activity space, the heavy metal pollution of Farmland in China has been increasingly aggravated. According to the 2014 National Soil Pollution Survey Communiqué, the rate of soil points exceeding the standard of cultivated land is 19.4%, of which the proportion of heavily polluted points is 1.1%, and the problem of farmland pollution cannot be ignored. [0003] Lead and cadmium can cause damage and threats to crops and human health. When lead cadmium enters plant cells in the soil, a series of physiological processes such as photosynthesis, respiration, nucleic acid metabolism and division of root cells of plants will b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/105B09C1/08
Inventor 汤叶涛严美琳肖雪严博方晁元卿王诗忠仇荣亮
Owner SUN YAT SEN UNIV
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