Method of governing Pb-Zn-Cd-Cu heavy metal polluted soil in super-enriched plant assisted intensified combined remediation mode

Abstract

The invention discloses a method of governing Pb-Zn-Cd-Cu heavy metal polluted soil in a super-enriched plant assisted intensified combined remediation mode. The method comprises the following steps:pre-treating soil containing Pd, Zn, Cd and Cu with sulfur powder, trisodium ethylenediamine disuccinate and monopotassium phosphate; and then planting symphytum officinale on the soil to enrich heavymetals. The method disclosed by the invention improves the enriching efficiency and the enriching quantity of the symphytum officinale on the heavy metals, and meanwhile, the symphytum officinale ishighly tolerant to Pb, Zn, Cd and Cu, so that various pollutants can be removed effectively. The method is low in cost and high in operability, the basic structure and function of the soil are not damaged, secondary pollution is not caused, and the method can be popularized and applied in large range.

Description

technical field [0001] The invention belongs to the field of contaminated soil remediation, and in particular relates to a combined remediation method of polluted soil which utilizes comfrey to enrich heavy metals and assists with other means. Background technique [0002] Due to the concealment of soil heavy metal pollution, the long-term and irreversible nature of cumulative damage, the remediation of heavy metal-contaminated soil is a very difficult and challenging task. It has also become a major scientific issue facing environmental governance under the new situation. At present, traditional physical and chemical remediation methods include foreign soil, soil replacement, deep plowing, soil leaching, thermal desorption, vitrification, electrodynamic remediation, solidification and stabilization, and other remediation methods for heavy metal contaminated soil due to their remediation costs. High, destructive to soil disturbance, and some even cause secondary pollution to...

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Problems solved by technology

[0004] However, the hyperaccumulators that have been discovered so far have small biomass, limited enrichment capacity, are selective for the growth environment, or have special requirements for the environment, or show unique enrichment capacity only in a suitable environment. It is difficult to introduce and promote the whole country and even the world; secondly, the vast majority of hyperaccumulator plants that have been discovered have strong specificity, and are good for single heavy metal pollution remediation, but not effective for compound pollution remediation. Heavy metal pollution is rare, and most of it is a complex phenomenon of coexistence of multiple heavy metal pollution, and soil is a complex multi-media system

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