Zhou Wenjun, Zhu Lizhong
Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310028, China.
Environ Pollut. 2007 May;147(1):66-73. doi: 10.1016/j.envpol.2006.08.018. Epub 2006 Oct 27.
The sorption of surfactants onto soils has a significant effect on the performance of surfactant enhanced desorption. In this study, the efficiency of surfactants in enhancing desorption for polycyclic aromatic hydrocarbons (PAHs) contaminated soils relative to water was evaluated with a term of relative efficiency coefficient (REC). Since the sorption of surfactants onto soils, surfactants only enhanced PAH desorption when REC values were larger than 1 and the added surfactant concentration was greater than the corresponding critical enhance desorption concentration (CEDC), which was defined as the corresponding surfactant concentration with REC=1. A model was utilized to describe and predict the REC and CEDC values for PAH desorption. The model and experimental results indicated that the efficiency of surfactants in enhancing PAH desorption showed strong dependence on the soil composition, surfactant structure and PAH properties. These results are of practical interest for the selection of surfactant to optimize soil remediation technologies.
表面活性剂在土壤上的吸附对表面活性剂强化解吸性能有显著影响。在本研究中，用相对效率系数（REC）来评估表面活性剂相对于水增强多环芳烃（PAHs）污染土壤解吸的效率。由于表面活性剂在土壤上的吸附，只有当REC值大于1且添加的表面活性剂浓度大于相应的临界增强解吸浓度（CEDC）时，表面活性剂才会增强PAH的解吸，CEDC定义为REC = 1时的相应表面活性剂浓度。利用一个模型来描述和预测PAH解吸的REC和CEDC值。模型和实验结果表明，表面活性剂增强PAH解吸的效率强烈依赖于土壤组成、表面活性剂结构和PAH性质。这些结果对于选择表面活性剂以优化土壤修复技术具有实际意义。
