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原文传递 ADSORPTION AND DESORPTION CAPACITY OF TRICHLOROETHYLENE ON GLACIAL TILL WITH HIGH-PERCENT FINES.

题名：	ADSORPTION AND DESORPTION CAPACITY OF TRICHLOROETHYLENE ON GLACIAL TILL WITH HIGH-PERCENT FINES.
作者：	Gates-K; Aragona-K; Sabodish-M; Gabr-MA
关键词：	Adsorption-; Desorption-; Fines-Materials; Glacial-soils; Kinetics-; Sodium-chloride; Soil-remediation; Surface-active-agents; Trichloroethylene-; Water-
摘要：	An investigation of trichloroethylene (TCE) mobility in glacial till, as manifested by adsorption and desorption behavior with water, surfactant, and sodium chloride, was conducted. In conjunction with natural attenuation, adsorption and desorption kinetics of surfactant are of interest if other remediation technologies, such as pump and treat, are used. A soil solution ratio of 2:1 with equilibrium times of 48 and 40 h for adsorption and desorption, respectively, was found to produce representative kinetics. The adsorption and desorption partition coefficients for TCE in water are 1.25 mL/g and 11.25 mL/g, respectively. The difference in these values is attributed to the heterogeneous nature of the test soil and hindered diffusion through the intraparticles of the soil and organic matter. Sorption of TCE to glacial till is reduced during adsorption and desorption testing with the use of a surfactant due to a decrease in interfacial tension and an increase in micellar solubilization. However, the effects of surfactant concentrations greater than 4% are minimal. The sodium chloride concentration is also varied during testing. As salinity increases, the adsorption and desorption coefficients increase and the solubility potential decreases for the same surfactant concentration. These results are attributed to Winsor Type phase changes that were observed independently of adsorption and desorption testing by varying the amounts of surfactant and sodium chloride with TCE. The methods used and results obtained from the testing program are described, and the mobility of the TCE within the test soil in view of the test parameters is discussed.
总页数：	Transportation Research Record. 2001. (1755) pp141-148 (5 Fig., 1 Tab., 17 Ref.)
报告类型：	科技报告