Biosurfactants are ecofriendly substitutes for chemical surfactants. In this study, biosurfactant-producing bacterial strains were isolated from soil and water samples from textile industry sites. Extracted biosurfactants could reduce the surface tension values from 72 to 39.3 mN/m demonstrating that the biosurfactants achieved the critical micelle concentration. Stable emulsifications with diesel and vegetable oil showed an emulsification index ranging from 61.76% to 76.47%. The presence of both rhamnolipid and surfactin types of biosurfactants was confirmed from our isolates using FTIR, LC-MS/MS, and GC-MS/MS analyses. These biosurfactant-producing bacteria act on dyes and heavy metals present in textile wastewater and reduce their concentrations by either degradation or biosorption. After the reaction with biosurfactant-producing bacterial isolates, FTIR spectra confirmed the breakdown of some compounds and their conversion into intermediates. There was also a reduction in the concentration of metals in textile effluents, as shown by EDAX analysis. These novel bacteria can be scaled up for their use in water reclamation and recycled for regular industrial use.

中文翻译：

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用于去除纺织废水中微污染物的生物表面活性剂生产细菌的分离、筛选、表征和优化


生物表面活性剂是化学表面活性剂的环保替代品。在这项研究中，从纺织工业场所的土壤和水样中分离出了产生生物表面活性剂的细菌菌株。提取的生物表面活性剂可以将表面张力值从 72 mN/m 降低至 39.3 mN/m，表明生物表面活性剂达到了临界胶束浓度。与柴油和植物油的稳定乳化显示乳化指数范围为61.76%至76.47%。使用 FTIR、LC-MS/MS 和 GC-MS/MS 分析从我们的分离物中证实了鼠李糖脂和表面活性素类型的生物表面活性剂的存在。这些产生生物表面活性剂的细菌作用于纺织废水中存在的染料和重金属，并通过降解或生物吸附降低其浓度。与产生生物表面活性剂的细菌分离物反应后，FTIR 光谱证实了一些化合物的分解及其转化为中间体。 EDAX 分析显示，纺织废水中的金属浓度也有所降低。这些新型细菌可以扩大规模用于水回收和常规工业用途。