Method for restoring soil polluted by lead by utilizing super enrichment plant-Debregeasia saeneb

Abstract

A method for repairing the Pb polluted soil by the super-enriching plant Shuima willow includes such steps as planting the Shuima willow in the polluted soil for absorbing the Pb from the polluted soil, and removing them from the soil.

Description

technical field [0001] The invention relates to a phytoremediation technology for polluted environment, in particular to a method for remediating soil polluted by heavy metals by using hyperaccumulator phytoremediation. technical background [0002] There are usually two ways for heavy metals to pollute soil: one is the environmental pollution caused by metal mining activities. Serious soil; heavy metal polluted soil caused by leaching and other reasons during the stacking of mining waste rocks; soil pollution caused by mine wastewater containing high concentrations of heavy metals, etc. The second is heavy metal polluted soil caused by industrial sewage irrigation of farmland. The phenomenon of lead-contaminated soil is relatively common in some parts of my country, and it is especially serious in some non-ferrous metal mining areas and surrounding areas of smelters in Yunnan Province. The average lead content in the soil of a typical non-ferrous metal mining area in south...

AI Technical Summary

Problems solved by technology

Soil chemical leaching is one of the effective means to effectively treat soil polluted by volatile heavy metals. Choosing a suitable extractant is the key to this technology. However, no matter what kind of extractant, there are problems such as recovery and secondary pollution that have not been solved or perfected. technical problems; electrodynamic restoration is especially suitable for low-permeability clay and silt soil, and is economically reasonable, but due to the complexity of soil system components, there are often phenomena that are contrary to the actual application and experimental results, such as the buffer performance of soil, composition , ion composition, the type of polluted metal ions, etc. will all affect the effect of electrodynamic restoration. The metal electrode itself is easily corroded, and it will also cause secondary pollution of the soil. The disadvantage of electrothermal restoration is that soil organic matter and structural water are easily destroyed. It takes a lot of energy to drive away soil moisture; the soil improvement method is effective for small areas of soil pollution, but it is not suitable for large-scale soil pollution control, and there are still problems in properly handling the replaced soil to avoid secondary pollution; Solidification technology has a certain effect, in-situ solidification of heavy metals, greatly reducing costs, but it also has certain limitations: it only changes the form of heavy metals in the soil, and does not know much about the long-term stability of the soil and its impact on the ecosystem. research in this area

However, most of the discovered lead hyperaccumulative plants have small biomass and slow growth, which greatly limits their practical application in remediating lead-contaminated soils.