Method for performing treatment on heavy metal contaminated soil by combining plants and chelating agent

Abstract

The invention discloses a method for performing treatment on heavy metal contaminated soil by combining plants and a chelating agent. The method comprises the steps of growing the plants having concentrating capability on heavy metals in the heavy metal contaminated soil of which the heavy metal contaminant types are Zn, Pb, Cd and Cu, and putting the chelating agent into the heavy metal contaminated soil, wherein each plant having the concentrating capability on the heavy metals is a poplar, peganum harmala or Nitraria tangutorum; the poplar is Populus bolleana; and the chelating agent is EDTA (Ethylene Diamine Tetraacetic Acid), EGTA (Ethylene Glycol Tetraacetic Acid) or CA (Citric Acid). According to the method disclosed by the invention, the development of the industry of plant growingand soil recycling is promoted, and thus, recycling of renewable resources is facilitated; and economic and ecological environmental-protection regeneration treatment is performed on a region contaminated by the heavy metals, so that global ecological equilibrium is facilitated.

Description

Technical field [0001] The invention belongs to the field of prevention and control of heavy metal polluted soil, and specifically relates to a method for treating heavy metal polluted soil with a plant 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, which has led to increasingly serious pollution of heavy metals, and soil pollution hazards of heavy metals are particularly prominent. The pollution of heavy metals in Renhua City, Shaoguan City, Guangdong Province is relatively serious. Children’s blood lead has exceeded the standard, which has had a significant impact on the balance of Guangdong’s ecological environment. Therefore, treatment of heavy metal soil pollution has become the primary task of environmental protection. [0003] Soil contaminated by heavy metals can be repaired by chemical and physical methods....

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

Images