Investigation of heavy metals desorption enhancement procedures in low-permeability contaminated soils

Abstract

A significant amount of hydrocarbon contaminants (therefore heavy metal components) has remained in the soil due to careless industrial activities. Effective remediation is difficult, especially in low-permeability soils because it is extremely difficult to get desorption. A lot of research has been conducted on extreme soil acidification, batching of oxidants, air-fluid injection and electrokinetic treatment, there were successful but due to the risk from extreme loads, these methods can only be used solely in controlled ex-situ environments. This paper investigates an eco-friendly in situ treatment with carbamide peroxide in low-permeability silty clay. After several repetitions, the result of tests proved Cu component was fully adsorbed on clayey-silt among applied concentration and circumstances which applied, while two other components were partially adsorbed. Moreover, the experiments carried out to enhancement of desorption proved to be successful for Cu, Zn and Mn with carbamide peroxide.