Heavy metal-polycyclic aromatic hydrocarbon combined polluted soil reinforcer and application thereof

Abstract

The invention relates to a plant rehabilitation technology of cadmium-polycyclic aromatic hydrocarbon combined polluted soil, in particular to a heavy metal-polycyclic aromatic hydrocarbon combined polluted soil reinforcer and application thereof. The reinforcer comprises the following components in mol ratio of citric acid: salicylic acid of (0.5-5.0):(0.1-1.0). The reinforcer is put into the heavy metal-polycyclic aromatic hydrocarbon combined polluted soil planted with hyperaccumulator and/or accumulator. The citric acid and the salicylic acid are mixed and then dissolved in water to be used as the reinforcer and then applied to the heavy metal-polycyclic aromatic hydrocarbon combined polluted soil planted with the hyperaccumulator and/or accumulator, especially polluted soil planted with nightshade, and after the nightshade is ripen, the plant and the soil samples are harvested; by comparing the harvested plant and soil samples with the plant and soil samples without the putting of the reinforcer, the treatment effect of the plant and soil samples applied with the reinforcer is best, the Cd extraction rate of the overground part of the nightshade is increased by 39.8 percent; meanwhile, the removal rate of the total quantity of the polycyclic aromatic hydrocarbons in the soil can reach 30.2 percent and the repair efficiency is remarkably improved.

Description

technical field [0001] The invention relates to a phytoremediation technology for cadmium-polycyclic aromatic hydrocarbon compound polluted soil, in particular to a heavy metal-polycyclic aromatic hydrocarbon compound polluted soil enhancer 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.Anetotoxicity assessment of contaminated forest soils from the Kola Peninsula.Science of the Total Environment, 355(13):106-117), in which heavy metal-organic compound pollution is a more common pollution type, Such as Cd-polycyclic aromatic hydrocarbons (Polycyclic aromatic hydrocarbons, PAHs) complex pollution. At lower concentrations, cadmium can inhibit plant growth and prod...

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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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