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Phytoremediation method for heavily cadmium and lead polluted farmland

A technology of 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 heavy heavy metal pollution, and achieve the effect of solving ecological risks, prompting timely renewal and improving effect.

Active Publication Date: 2021-07-02
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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  • Phytoremediation method for heavily cadmium and lead polluted farmland
  • Phytoremediation method for heavily cadmium and lead polluted farmland
  • Phytoremediation method for heavily cadmium and lead polluted farmland

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Embodiment 1～4

[0031] Selection of polluted soil: The test adopts field experiments, and the test site is the heavily cadmium-lead polluted farmland in Sidi Village, Xingping Town, Yangshuo County, Guilin, Guangxi. The average cadmium and lead pollution contents of the farmland soil are 2mg / kg and 600mg / kg respectively The proportions of cadmium and lead exceeding the soil pollution risk screening value (0.3mg / kg and 70-80mg / kg) for agricultural land in GB 15618-2018 "Soil Environmental Quality Standard" were 71.6% and 59.6%, respectively. The pH of most surface soils is acidic or slightly acidic.

[0032] Phytoremediation methods for severely cadmium and lead polluted farmland:

[0033] (1) Apply the passivation agent evenly at the place 20cm away from the surface layer of the polluted soil, plow and plow the field to fully mix the passivation agent with the soil. Wherein, the passivating agent of embodiment 1 and embodiment 3 adopts 0.5% coconut shell biochar, and the passivating agent of...

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Abstract

The invention belongs to the technical field of heavy metal polluted farmland remediation. The invention provides a phytoremediation method for heavily cadmium and lead polluted farmland. The method comprises the following steps: firstly, applying a passivating agent to the heavily cadmium and lead polluted farmland soil to reduce the bioavailability, migration and transformation capability and ecological toxicity of heavy metal elements in the soil, and then planting herbaceous fiber crops with heavy metal tolerance into the passivated soil for cultivation to stabilize the heavy metals in the soil and improve the remediation effect. And heavy metal is prevented from diffusing to the surrounding environment to cause further harm. The phytoremediation method is based on a plant stabilization technology, the problem of ecological risks of farmland land seriously polluted by cadmium and lead at the present stage is solved, the underground part of perennial herbaceous fiber crops is reserved in the soil seriously polluted by heavy metal, the effect of stabilizing the heavy metal in the soil can be continuously achieved, remediation can be continuously conducted, and the remediation effect is good. And economic benefits are generated while the soil is repaired.

Description

technical field [0001] The application belongs to the technical field of heavy metal-contaminated farmland restoration, and in particular relates to a phytoremediation method for heavily cadmium-lead polluted farmland. Background technique [0002] With the rapid development of urbanization, industry and agriculture, and the continuous expansion of human activity space in recent years, the pollution of heavy metals in my country's farmland is increasing day by day. According to the "National Soil Pollution Survey Bulletin" in 2014, 19.4% of farmland soil sites exceeded the standard, of which the proportion of heavily polluted sites was 1.1%. The problem of farmland pollution cannot be ignored. [0003] Lead and cadmium can cause damage and threat to crops and human health. Lead and cadmium in the soil enter the plant cells, and a series of physiological processes such as photosynthesis, respiration, nucleic acid metabolism and root cell division of the plant will be affecte...

Claims

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Application Information

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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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