A kind of remediation method of heavy metal nickel polluted soil

Abstract

The invention discloses a method for remediating heavy metal nickel-contaminated soil, comprising the following steps: A. Spraying an acetic acid solution with a mass fraction of 10% onto the nickel-contaminated soil for leaching, and the mass ratio of the acetic acid solution to the nickel-contaminated soil is: 1:1; B. Stand at room temperature for 12 hours; C. Separate the leached soil from the wastewater containing heavy metals; D. Use the potential transfer method to remove the remaining nickel ions in the leached contaminated soil. Compared with the existing multiple leaching method and ion migration method, the present invention is characterized by high removal rate of heavy metals, more energy saving and less impact on soil fertility.

Description

technical field [0001] The invention relates to the technical field of environmental protection and energy saving, in particular to a method for removing soil heavy metal pollutants. Background technique [0002] Soil heavy metal pollution is becoming more and more serious in our country. At present, engineering, physical and chemical methods are used to repair heavy metal polluted soil. It is difficult to treat polluted soil on a large scale, and it can lead to the destruction of soil structure and the decline of biological activity. and the degradation of soil fertility have certain limitations; bioremediation is an emerging high-efficiency restoration technology that is easily accepted by the public and has good social and ecological benefits, but the technology is not yet mature enough, and the restoration period is long and the restoration effect is low. Not good; the adoption of agricultural ecological measures has the characteristics of long period and insignificant e...

AI Technical Summary

Problems solved by technology

[0002] Soil heavy metal pollution is becoming more and more serious in our country. At present, engineering, physical and chemical methods are used to repair heavy metal polluted soil. It is difficult to treat polluted soil on a large scale, and it can lead to the destruction of soil structure and the decline of biological activity. and the degradation of soil fertility have certain limitations; bioremediation is an emerging high-efficiency restoration technology that is easily accepted by the public and has good social and ecological benefits, but the technology is not yet mature enough, and the restoration period is long and the restoration effect is low. Not good; the adoption of agricultural ecological measures has the characteristics of long period and insignificant effect; although soil leaching technology is widely used in the treatment of heavy metal pollution in soil, the soil leaching method requires multiple leaching to effectively remove soil heavy metal content , but the cost of multiple leaching is very high, the water demand is large, and a lot of waste water containing heavy metals will be produced. In the case of prominent water shortages, this method is not only a waste of resources, but also increases production costs and production processes. At the same time, due to repeated leaching, soil fertility will be seriously reduced, but if the number of leaching is reduced, the heavy metal removal effect will be greatly affected, which cannot meet the standard requirements; and the ion potential migration repair technology is a newly developed technology, but this technology is for The remediation effect is better when the soil porosity is high and the water content is high, but the effect of direct application on soil with low porosity is poor, and the removal effect of organically bound and residual heavy metals is poor

Therefore, so far there is no technology that can solve the problem of heavy metal pollution in soil