Restorative method for soil polluted by cyanide

Abstract

The invention discloses a restorative method for soil polluted by cyanide. According to the characteristics that the soil polluted by cyanide comprises the cyanide, heavy metal and various pollutants and particularly according to the characteristic that the cyanide further comprises metal cyanide complex, such as iron cyanide complex, difficult to treat, firstly, ferrous sulfate and zinc sulfate are selected to fix the iron cyanide complex and various kinds of metal in the soil, and then the cyanide difficult to treat, sulfocyanide and other pollutants remaining in the soil are treated through ozone. The cyanide and various kinds of metal in the treated soil meet the national soil environment quality evaluation requirement.

Description

technical field

[0001] The invention relates to a method for treating pollutants in the field of environmental protection, in particular to a method for repairing cyanide-contaminated soil. Background technique

[0002] Because cyanide has good surface activity, activation performance and complexing ability, it has been widely used in gold, electroplating, organic chemical industry and other industries in recent years, so the problem of soil cyanide pollution is becoming more and more serious. The natural degradation rate of cyanide in soil is much slower than its degradation rate in natural water bodies, and under certain conditions, it can be highly enriched in soil, which has long-term potential danger to plant growth, surface water, and groundwater. At present, the remediation technology of cyanide-contaminated soil at home and abroad is mainly based on plant method and microbial method, but due to the conditions and long cycle of plant growth, as well as the limitation ...