利用表面活性剂强化去除土壤中NAPLs的研究进展

Advances in surfactant-enhanced remediation of NAPLs-contaminated soil

该文评述了近年来国内外利用表面活性剂去除土-水系统中非水相流体(NAPLs)的研究进展,重点讨论了其作用机理和主要影响因素。大量研究表明,表面活性剂能促进NAPLs从土壤颗粒中解吸,并通过增溶和增流作用改善NAPLs在土壤中的溶解和迁移能力,进而提高抽出处理法的去除效率。同时,表面活性剂对NAPLs的生物降解也有一定影响。表面活性剂对NAPLs去除效率与其种类和投加浓度、土壤异质性、电解质和温度等因素有关。

The advances in researches concerning remediation NAPLs in contaminated soil by surfactant in China and abroad are reviewed, and the mechanisms of the remediation and its influencing factors are primarily discussed. Results of the studies have comfirmed that surfactants cause the NAPLs to desorb from soil strongly and enhances the transferability of NAPLs through soil by improving their dissolution in liquid and fluid ability in soil. So the efficiency of pump-treat method can be improved by the surfactants. Surfactant also can influence the biodegradation of NAPLs. The variety and concentration of surfactant, heterogeneity, cations and temperature are important factors on the efficiency of surfactant.