Remediation method of heavy metal contaminated soil

Abstract

The invention relates to a remediation method of heavy metal contaminated soil, and the method comprises the following steps of: building a water collecting ditch around the heavy metal contaminated soil, and paving an impermeable membrane on the bottom of the water collecting ditch; building a water collecting tank communicated with the water collecting ditch, and paving impermeable membranes on the bottom and side walls of the water collecting tank; spraying acid leachate to the surface of the heavy metal contaminated soil, wherein the acid leachate permeates into the water collecting ditch through the heavy metal contaminated soil and gathers in the water collecting tank to obtain heavy metal-containing leachate; performing leaching remediation on the heavy metal contaminated soil by use of the heavy metal-containing leachate until the measured content of heavy metal in the heavy metal contaminated soil does not change; and leaching the heavy metal contaminated soil with clean water until the soil is neutral. The method provided by the invention is widely applicable and has the advantage of large processing capacity. After the soil remediation is finished, the method also can be used for performing microbial remediation and phytoremediation on the soil not reaching the state-specified standard in terms of heavy metal content.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to a method for remediating heavy metal-contaminated soil. Background technique [0002] As an important part of the ecosphere, soil is one of the most basic material foundations for human survival, and it is also the main storage place for various pollutants. All over the world, the area of ​​polluted soil continues to expand, especially in my country, with the development of industrial and agricultural production and rural urbanization, soil pollution is spreading rapidly and the degree of pollution is gradually intensifying. According to reports, the polluted land area in the country has accounted for 1 / 5 of the cultivated land area, with a total area of ​​more than 20 million hectares. [0003] Soil pollution, especially the accumulation of heavy metals in vegetables and grains, puts humans at the top of the food chain at risk. Moreover, heavy metal pollu...

AI Technical Summary

Problems solved by technology

The above methods have their own advantages, but there are also many disadvantages. For example, some have a narrow scope of application and can only target a certain type or type of heavy metals; some have small processing capacity and high cost; some have insignificant effects and slow results

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