State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
College of Water Sciences, Beijing Normal University, Beijing, 100875, China.
Environ Sci Pollut Res Int. 2020 Jun;27(18):23323-23330. doi: 10.1007/s11356-020-08781-6. Epub 2020 Apr 26.
Although nonionic surfactant is widely used for petroleum-contaminated soil washing, there is no definite conclusion on the main soil factors which determine the removal of petroleum hydrocarbons from the soil. In this study, the influences of soil properties on Triton X-100-aided soil washing were investigated using 12 soils in China. The sorption characteristic of Triton X-100 on soils was described as well. The sorption isotherms of Triton X-100 on 12 typical soils were fitted to the Langmuir adsorption model, and the maximum sorption amount of Triton X-100 (Q) varied from 1.54 to 15.15 mg/g. The removal rates of diesel for 12 soils were well fitted to the modified Michaelis-Menten equation, and the maximum removal rate of diesel (φ) ranged from 62.92 to 90.36%. The correlation analysis indicated that the φ is significantly correlated with the Q. The soil factors affecting diesel removal from soils followed the order of sand content > cation exchange capacity (CEC) > organic matter (OM) content > silt and clay content > SSA >> pH. The prediction model based on CEC, silt content, and pH explained 83.1% of variance of diesel removal from soils. This study will have important implication for successfully remediating organic-contaminated soil using nonionic surfactant-based soil washing.
虽然非离子表面活性剂被广泛应用于石油污染土壤的洗涤，但对于决定土壤中石油烃去除的主要土壤因素，尚未得出明确的结论。本研究采用中国的 12 种土壤，研究了土壤性质对 Triton X-100 辅助土壤洗涤的影响。同时还描述了 Triton X-100 在土壤中的吸附特性。Triton X-100 在 12 种典型土壤上的吸附等温线符合朗缪尔吸附模型，Triton X-100 的最大吸附量（Q）在 1.54 到 15.15mg/g 之间变化。12 种土壤的柴油去除率与改进的米氏方程拟合良好，柴油的最大去除率（φ）在 62.92%到 90.36%之间变化。相关性分析表明，φ与 Q 显著相关。影响土壤中石油烃去除的土壤因素的顺序为：砂含量＞阳离子交换容量（CEC）＞有机质（OM）含量＞粉土和粘土含量＞比表面积（SSA）＞pH。基于 CEC、粉土含量和 pH 的预测模型解释了 83.1%的土壤中石油烃去除率的变化。本研究对于成功使用非离子表面活性剂土壤洗涤修复有机污染土壤具有重要意义。
