University of Chinese Academy of Sciences, China; Institute of Porous Flow & Fluid Mechanics, University of Chinese Academy of Sciences, China; PetroChina Research Institute of Petroleum Exploration and Development, China.
PetroChina Research Institute of Petroleum Exploration and Development, China.
Ecotoxicol Environ Saf. 2021 Apr 1;212:111964. doi: 10.1016/j.ecoenv.2021.111964. Epub 2021 Jan 30.
A systematic study had been carried out to get insight into the micellar behavior of anionic lipopeptide (LT) and nonionic sophorolipid (SL) in their different mass ratio mixed state using the technique of tensiometry. The models proposed by Clint, Rubingh and Gibbs et al. had been employed to interpret the formation of mixed micelles and found out synergism. The obtained experimental critical micelle concentrations (CMC) were lower than the ideal CMCs, indicating negative deviation from ideal behavior for all multi-component mixed micelles formation. A suited binary bio-surfactant mixing system was selected as the washing agents to treat the oily sludge produced from Huabei oilfield by the thermal bio-surfactant washing method. The results showed that in case of the mass ratios of 8:2 the CMC was dramatically decreased and synergism was the strongest in LT and SL bi mixed surfactant systems. The studied binary mixed bio-surfactant system showed higher washing efficiency for oily sludge than single surfactant system. In addition, the washing power of binary mixed bio-surfactants towards oily sludge was the best at below washing conditions: (a) the concentration of the mixed system (100 mg/L), (b) temperature (55 ℃), (c) ratio of sludge/liquid (1:3), (d) washing time (3 h), and (e) stirring speed (300 rpm). Certainly, the washing abilities of the selected surfactants not only depend on their mixing ratio and washing conditions but also associate with microstructure and mineral components of oily sludge.
采用张力法对阴离子脂肽（LT）和非离子槐糖脂（SL）在不同质量比混合状态下的胶束行为进行了系统研究。采用 Clint、Rubingh 和 Gibbs 等提出的模型来解释混合胶束的形成，并发现协同作用。获得的实验临界胶束浓度（CMC）低于理想 CMC，表明所有多组分混合胶束的形成均存在负偏离理想行为。选择合适的二元生物表面活性剂混合体系作为洗涤剂，采用热生物表面活性剂洗涤法处理来自华北油田的含油污泥。结果表明，在质量比为 8:2 的情况下，CMC 显著降低，LT 和 SL 双混合表面活性剂体系的协同作用最强。与单一表面活性剂体系相比，所研究的二元混合生物表面活性剂体系对含油污泥具有更高的洗涤效率。此外，二元混合生物表面活性剂对含油污泥的洗涤效果在以下洗涤条件下最佳：（a）混合体系浓度（100mg/L），（b）温度（55℃），（c）固液比（1:3），（d）洗涤时间（3h），和（e）搅拌速度（300rpm）。当然，所选表面活性剂的洗涤能力不仅取决于其混合比例和洗涤条件，还与含油污泥的微观结构和矿物成分有关。
