Department of Energy, National Energy Technology Laboratory, 1450 Queens Avenue SW Albany, OR 97321, USA.
J Environ Sci (China). 2013 Mar 1;25(3):576-84. doi: 10.1016/s1001-0742(12)60070-9.
Surfactants are soil washing agents and facilitators for subsurface remediation of hydrocarbon spills. It is important to understand the sorption and transport behavior of surfactants for enhanced soil remediation. The adsorption and desorption isotherms of cetyl trimethylammonium bromide (CTAB) and Triton X-100 with sand and kaolinite have been quantified. Kaolinite clay had the highest sorption capacity compared to blasting sand. Transport parameters such as diffusion coefficient (D) and retardation factor (R) of the above mentioned surfactant solutions were determined in clayey soils (82.5% sand and 17.5% kaolinite mixture) with near zero and 0.1 g/L ionic strength. NaCl was used as the electrolyte solution. Convection-Diffusion equation was used to model the breakthrough curves of the surfactants. Bromide ion was chosen as the tracer material in order to characterize the column. CTAB and Triton X-100 were used to flush the perchloroethylene (PCE) contaminated soil. The effectiveness of CTAB and Triton X-100 in flushing the PCE from the contaminated soil was quantified.
表面活性剂是土壤洗涤剂，也是促进地下烃类溢油补救的促进剂。了解表面活性剂的吸附和迁移行为对于增强土壤修复非常重要。本文定量研究了十六烷基三甲基溴化铵（CTAB）和 Triton X-100 在砂土和高岭土上的吸附和解吸等温线。与爆破砂相比，高岭土具有最高的吸附能力。在离子强度接近零和 0.1 g/L 的粘性土（82.5%砂和 17.5%高岭土混合物）中，测定了上述表面活性剂溶液的扩散系数（D）和阻滞因子（R）等传输参数。NaCl 用作电解质溶液。对流-扩散方程用于模拟表面活性剂的穿透曲线。选择溴化物离子作为示踪材料，以表征该柱。使用 CTAB 和 Triton X-100 冲洗受全氯乙烯（PCE）污染的土壤。定量评估了 CTAB 和 Triton X-100 从受污染土壤中冲洗 PCE 的效果。
