The study aims to enhance the efficacy of surfactants using salt and multi-walled carbon nanotubes (MWCNT) for washing used engine oil (UEO) contaminated soil and compare the geotechnical properties of contaminated soil before and after washing (batch washing and soil washing). From batch washing of the contaminated soil the efficacy of the cleaning process is established. Contamination of soil with hydro carbons present in UEO significantly affects its’ engineering properties manifesting in no plasticity and low specific gravity; the corresponding optimum moisture content value is 6.42% while maximum dry density is 1.770 g/cc, which are considerably lower than those of the uncontaminated soil. The result also showed decrease in the values of cohesion intercept and increase in the friction angle values. The adopted soil washing technique resulted increase in specific gravity from 1.85 to 2.13 and cohesion from 0.443 to 1.04 kg/cm² and substantial decrease in the friction angle from 31.16° to 17.14° when washed with most efficient combination of SDS surfactant along with sodium meta-silicate (salt) and MWCNT. Effectiveness of the washing of contaminated soil by batch processing and soil washing techniques has been established qualitatively. The efficiency of surfactant treatment has been observed to be increased significantly by the addition of salt and MWCNT.

这项研究旨在提高使用盐和多壁碳纳米管（MWCNT）的表面活性剂对洗涤用过的机油（UEO）污染的土壤的功效，并比较洗涤前后（分批洗涤和土壤洗涤）污染土壤的岩土性能。通过分批清洗受污染的土壤，可以建立清洗过程的功效。UEO中存在的碳氢化合物污染土壤会显着影响其工程特性，表现为无可塑性和低比重。相应的最佳水分含量值为6.42％，而最大干燥密度为1.770 g / cc，这大大低于未污染土壤的水分含量。结果还表明，内聚力拦截值减小，而摩擦角值增大。^{如图2所示}，当用SDS表面活性剂与偏硅酸钠（盐）和MWCNT的最有效组合洗涤时，摩擦角从31.16°大幅降低至17.14°。定性地确定了通过分批处理和土壤洗涤技术洗涤污染土壤的有效性。已经观察到，通过添加盐和MWCNT，表面活性剂处理的效率显着提高。