A kind of remediation method for heavy metal polluted soil

Abstract

The invention belongs to the technical field of soil remediation, and specifically relates to a remediation method for heavy metal-contaminated soil. The method comprises the following steps: removing impurities such as bricks and stones in soil contaminated by heavy metals; removing impurities from the soil Put the feed port into the heavy metal contaminated soil remediation device, and start the motor at the same time, the motor drives the rotating shaft to rotate, and the rotating shaft drives the grinding block and the material guide block to rotate, so that the column drives the blades to rotate and initially chop the soil; in order to prevent the soil volume from being too large Large blockage of the guide pipe, increasing the feeding rate; the present invention protects the components in the heavy metal contaminated soil remediation device by pretreating the polluted soil, and the heavy metal contaminated soil remediation device in the present invention has simple structure, convenient operation and low manufacturing cost , and it integrates soil crushing, screening and rinsing, which greatly saves labor and improves the efficiency of soil restoration.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, in particular to a remediation method for heavy metal polluted soil. Background technique [0002] Soil pollution is one of the most serious environmental problems facing human society, and the remediation of contaminated soil has become a hot spot in the field of environmental remediation. Existing soil remediation technologies mainly include thermal desorption technology, electrodynamic remediation, biological remediation, solidification and stabilization remediation and soil leaching remediation. Among them, soil leaching remediation of heavy metal-contaminated soil is due to its rapid remediation, wide adaptability and thorough remediation. It has been widely studied and applied to actual restoration projects because of its characteristics, and has broad market space and development prospects. [0003] At present, the leaching agents for leaching and remediation of heavy metal-conta...

AI Technical Summary

Problems solved by technology

Inorganic leaching agent is a method of eluting heavy metals from soil through the ion exchange of water, inorganic acid, inorganic salt solution, etc. This method is low in cost, but has the disadvantages of low leaching efficiency and large water consumption; chelating agent is Using EDTA, citric acid, etc. to desorb the heavy metal ions attached to the surface of soil particles through chelation has the advantages of fast and efficient, but the high cost of large investment makes this method difficult to be widely used; surfactants The purpose of pollutant elution is achieved by changing the surface properties of the soil or ion exchange, etc., but there are disadvantages such as high regeneration cost and easy to produce secondary pollution; the compound chemical leaching method is a hot spot in the field of soil remediation at present, and its principle is A method for efficiently eluting heavy metal ions in contaminated soil through the synergistic effect of multiple eluents

[0004] In short, the current soil leaching and restoration technologies are restricted by their own shortcomings, and it is difficult to obtain large-scale promotion. Moreover, the cost of restoration equipment is high, and the restoration effect on soil is poor.

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