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首页> 外文期刊>Environmental Science & Technology >Role of Desorption Kinetics in the Rhamnolipid-Enhanced Biodegradation of Polycyclic Aromatic Hydrocarbons
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Role of Desorption Kinetics in the Rhamnolipid-Enhanced Biodegradation of Polycyclic Aromatic Hydrocarbons

机译：解吸动力学在鼠李糖脂增强的多环芳烃生物降解中的作用

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摘要

The main aim of this study was to investigate the effect of a rhamnolipid biosurfactant on biodegradation of ~(14)C-labeled phenanthrene and pyrene under desorption-limiting conditions. The rhamnolipid caused a significant solubilization and enhanced biodegradation of PAHs sorbed to soils. The enhancement was, however, negatively influenced by experimental conditions that caused an enrichment of slow desorption fractions. These conditions included aging, a higher organic matter content in soil, and previous extraction with Tenax to remove the labile-desorbing chemical. The decline in bioavailability caused by aging on sorbed ~(14)C-pyrene was partially reversed by rhamnolipids, which enhanced mineralization of the aged compound, although not so efficiently like with the unaged chemical. This loss in biosurfactant efficiency in promoting biodegradation can be explained by infra-aggregate diffusion of the pollutant during aging. We suggest that rhamnolipid can enhance biodegradation of soil-sorbed PAHs by micellar solubilization, which increase the cell exposure to the chemicals in the aqueous phase, and partitioning into soil organic matter, thus enhancing the kinetics of slow desorption. Our study show that rhamnolipid can constitute a valid alternative to chemical surfactants in promoting the biodegradation of slow desorption PAHs, which constitutes a major bottleneck in bioremediation.
机译：这项研究的主要目的是研究鼠李糖脂生物表面活性剂在解吸限制条件下对〜（14）C标记的菲和pyr的生物降解的影响。鼠李糖脂引起显着的增溶作用，并增强了吸附到土壤中的PAHs的生物降解。但是，这种增强受到实验条件的不利影响，导致富集了缓慢的解吸级分。这些条件包括老化，土壤中有机物含量更高以及先前用Tenax进行萃取以去除不稳定的解吸化学品。鼠李糖脂可部分逆转由吸附的〜（14）C-py老化引起的生物利用度下降，鼠李糖脂可增强老化化合物的矿化作用，尽管不像未老化的化学品那样有效。生物表面活性剂促进生物降解效率的这种下降可以用老化过程中污染物的总扩散来解释。我们建议鼠李糖脂可以通过胶束增溶作用增强土壤吸附的PAHs的生物降解，这增加了细胞在水相中暴露于化学物质的能力，并分配到土壤有机质中，从而增强了缓慢解吸的动力学。我们的研究表明，鼠李糖脂可以替代化学表面活性剂，从而促进缓慢解吸的PAHs的生物降解，这是生物修复的主要瓶颈。

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  • 来源
    《Environmental Science & Technology》 |2014年第18期|10869-10877|共9页
  • 作者

    Eleonora Congiu; Jose-Julio Ortega-Calvo;

  • 作者单位

    Instituto de Recursos Naturales y Agrobiologia de Seviila (IRNAS-CSIC), Apartado 1052, E-41080-Seville, Spain;

    Instituto de Recursos Naturales y Agrobiologia de Seviila (IRNAS-CSIC), Apartado 1052, E-41080-Seville, Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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