Additive for repairing polluted soil and application thereof

Abstract

The invention relates to a plant repair technology for heavy metal-polycyclic aromatic hydrocarbon composite polluted soil, in particular to application of an additive for repairing polluted soil. The additive consists of the following components by mole: 0.1 to 1.0 mole of ethylene glycol tetraacetic acid (EGTA), 0.5 to 5.0 moles of citric acid and 0.1 to 1.0 mole of Tween 80. The additive is added into the heavy metal-polycyclic aromatic hydrocarbon composite polluted soil planted with hyper-accumulators and/or accumulators. The EGTA, the citric acid and the Tween 80 are mixed and dissolved in water to form a reinforcing agent, then the reinforcing agent is applied to the heavy metal-polycyclic aromatic hydrocarbon composite polluted soil planted with the hyper-accumulators and/or the accumulators, particularly the polluted soil planted with night shades, and plants and soil samples are harvested when the night shades are mature; compared with the contrast without adding the reinforcing agent, the treatment effect is better when the reinforcing agent is applied, the extraction rate of the ground part Cd of the night shades is increased by 17.8 percent, meanwhile, the removal rate of the total amount of the polycyclic aromatic hydrocarbon of the soil can reach 25.8 percent, and the repair efficiency is remarkably improved.

Description

technical field [0001] The invention relates to a phytoremediation technology for heavy metal-polycyclic aromatic hydrocarbon compound polluted soil, in particular to an additive for remediating polluted soil and its application. Background technique [0002] With the diversification, complexity and frequency of pollutant discharge, the main receptor soil of pollutants is increasingly polluted, and the complexity and refractory characteristics of contaminated soil remediation are also becoming more prominent (Reference 1: Paton GI, Vivent sova E, Kumpene J, et al.2006.An ecotoxicity assessment of contaminated forest soils from the Kola Peninsula.Science of the Total Environment, 355(13):106-117), among which heavy metal-organic compound pollution is a more common pollution Types, such as Cd-polycyclic aromatic hydrocarbons (Polycyclic aromatic hydrocarbons, PAHs) compound pollution. At lower concentrations, cadmium can inhibit plant growth and produce toxic effects on plant...

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Problems solved by technology

However, phytoremediation technology also has some defects and limitations, such as being easily affected by env

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