Abstract: In order to reveal the interaction effects between surfactant and organic contaminants in cohesive soils, this paper selected sodium lauroylsarcosinate (SLS) as surfactant and methyl tert-butyl ether (MTBE) as organic contaminants to systematically study the solubilization and desorption of surfactant on organic contaminants in cohesive soils. The results show that the solubilization effect of surfactant on MTBE increases rapidly and tends to be stable with the increase of its concentration; the adsorption of cohesive soils on contaminants is significant, and Henry model can be used to obtain its adsorption characteristics and distribution coefficient; when the mass concentration of surfactant is low, the adsorption of soil on contaminants is strong, when it increases to 1 300 mg/L, surfactant will promote the desorption of contaminants; the low mass concentration surfactant does not significantly affect the overall contamination degree of soil, but the significant solubilization will promote the migration of contaminants and make their distribution more uniform; the significant desorption effect of high mass concentration surfactant on contaminants will increase the mass concentration of dissolved MTBE in soil. The results can provide reference for the study of site remediation of organic contaminants.
Keywords: surfactant; cohesive soil; organic contaminants; solubilization; adsorption/desorption
合肥工业大学学报自科版