Many studies have addressed the desorption and mobilization performances of sorbed contaminants affected by different rhamnolipidic biosurfactants. Study results have been mixed and complicated. Rhamnolipids are always microbial produced with variable homologues. In this study, two representative rhamnolipidic fractions (i.e., RL-F1 and RL-F2, which are mono- and di-rhamnolipids, respectively) were investigated and compared to determine their influence on 17α-ethynylestradiol (EE2) distribution within sediment-water sorption and desorption systems. In general, the coexistence of RL-F1 and EE2 enhanced EE2 sorption in a wider monorhamnolipidic dosage range when freshly treated sorbate was used. The sorbed EE2 concentration decreased as the RL-F1 dosage increased in the aged sorbate desorption systems. However, RL-F2 facilitated EE2 mobilization in both sorption and desorption processes. Experimental data were estimated using a conceptual model that considered the sorbed rhamnolipids and aqueous micelles for organic partitioning. The model results indicated that the rhamnolipid type is an important factor influencing organic distribution, in addition to sorbate aging process and sediment characteristics. The use of a rhamnolipidic mixture containing both mono- and di-rhamnosyl components may not achieve the desired effect when the biosurfactant-enhanced mobilization or immobilization approach is selected. These results are significant for selecting and applying rhamnolipids to remediate contaminants.

许多研究已经解决了受不同鼠李糖脂生物表面活性剂影响的吸附污染物的解吸和迁移性能。研究结果既复杂又复杂。鼠李糖脂总是由具有不同同系物的微生物产生。在这项研究中，两个代表性rhamnolipidic馏分（即，RL-F1和RL-F2，其是单-和二-鼠李糖脂，分别地）进行了调查和比较，以确定在17自己的影响α-乙炔雌二醇（EE2）在沉积物-水吸附和解吸系统中的分布。通常，当使用新鲜处理的山梨酸酯时，RL-F1和EE2的共存会在更宽的单鼠李糖脂剂量范围内增强EE2的吸附。在老化的山梨酸酯解吸系统中，随着RL-F1剂量的增加，吸附的EE2浓度降低。然而，RL-F2促进了EE2在吸附和解吸过程中的动员。实验数据是使用概念模型估算的，该模型考虑了吸附的鼠李糖脂和水性胶束进行有机分配。模型结果表明，鼠李糖脂类型是影响有机物分布的重要因素，除了吸附剂老化过程和沉积物特征。选择生物表面活性剂增强的动员或固定方法时同时含有单 - 和二 - 鼠李糖成分使用rhamnolipidic混合物的可能无法达到所期望的效果。这些结果对于选择和应用鼠李糖脂来修复污染物具有重要意义。