Method for treating heavy metal contaminated soil by using plants and chelating agents

Abstract

The invention discloses a method for treating heavy metal contaminated soil by using plants and chelating agents. The method comprises the steps of planting the plants having enrichment capacity for heavy metals in the heavy metal contaminated soil with heavy metal contamination type Zn, Pb, Cd and Cu, and putting the chelating agents in the heavy metal contaminated soil. The plants which have enrichment capacity for the heavy metals comprise aspens, peganum harmala or nitraria sibirica palls. The aspens are populus alba var.pyramidalis bunge. The chelating agents are EDTA, EGTA or CA (citric acid). By adopting the method, plant cultivation and soil recycling industry development is pushed, reutilization of nonrenewable resources is benefited, economy, zoology and environmental protection regeneration treatment is carried on the areas after being contaminated by the heavy metals, and whole ecological balance is facilitated.

Description

technical field [0001] The invention belongs to the field of prevention and control of heavy metal polluted soil, in particular to a method for treating heavy metal polluted soil with plants combined with a chelating agent. Background technique [0002] Due to the development of industrialization and urbanization, the production and consumption of heavy metals in my country have increased significantly, resulting in increasingly serious heavy metal pollution, especially the soil pollution hazards of heavy metals. Heavy metal pollution in Renhua, Shaoguan City, Guangdong Province is relatively serious. Children's blood lead levels once exceeded the standard, which had a major impact on the balance of Guangdong's ecological environment. Therefore, the treatment of heavy metal soil pollution has become the primary task of environmental protection. [0003] Soil polluted by heavy metals can be repaired by chemical and physical methods. However, the cost of physical and chemical...

AI Technical Summary

Problems solved by technology

The results of these treatment methods are all in the soil. Even if the heavy metals are combined into compounds that are difficult to decompose, the heavy metals are still not extracted from the soil. At the same time, it is inevitable to change the soil properties, destroy the original soil microbial environment, and cause secondary Secondary pollution and other issues

And expensive, difficult to apply on a large scale

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