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首页> 外文期刊>Environmental Science & Technology >Screening Nonionic Surfactants for Enhanced Biodegradation of Polycyclic Aromatic Hydrocarbons Remaining in Soil After Conventional Biological Treatment
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Screening Nonionic Surfactants for Enhanced Biodegradation of Polycyclic Aromatic Hydrocarbons Remaining in Soil After Conventional Biological Treatment

机译：常规生物处理后，筛选可增强土壤中残留多环芳烃生物降解能力的非离子表面活性剂

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摘要

A total of five nonionic surfactants (Brij 30, Span 20, Ecosurf EH-3, polyoxyethylene sorbitol hexaoleate, and R-95 rhamnolipid) were evaluated for their ability to enhance PAH desorption and biodegradation in contaminated soil after treatment in an aerobic bioreactor. Surfactant doses corresponded to aqueous-phase concentrations below the critical micelle concentration in the soil-slurry system. The effect of surfactant amendment on soil (geno)toxicity was also evaluated for Brij 30, Span 20, and POESH using the DT40 B- lymphocyte cell line and two of its DNA-repair-deficient mutants. Compared to the results from no-surfactant controls, incubation of the bioreactor-treated soil with all surfactants increased PAH desorption, and all except R-95 substantially increased PAH biodegradation. POESH had the greatest effect, removing 50% of total measured PAHs. Brij 30, Span 20, and POESH were particularly effective at enhancing biodegradation of four- and five-ring PAHs, including five of the seven carcinogenic PAHs, with removals up to 80%. Surfactant amendment also significantly enhanced the removal of alkyl-PAHs. Most treatments significantly increased soil toxicity. Only the no-surfactant control and Brij 30 at the optimum dose significantly decreased soil genotoxicity, as evaluated with either mutant cell line. Overall, these findings have implications for the feasibility of bioremediation to achieve cleanup levels for PAHs in soil.
机译：在好氧生物反应器中处理后，评估了总共五种非离子表面活性剂（Brij 30，Span 20，Ecosurf EH-3，聚氧乙烯山梨醇六油酸酯和R-95鼠李糖脂）在污染土壤中增强PAH脱附和生物降解的能力。表面活性剂的剂量对应于土壤浆液系统中低于临界胶束浓度的水相浓度。还使用DT40 B淋巴细胞细胞系及其两个DNA修复缺陷型突变体对Brij 30，Span 20和POESH评估了表面活性剂修饰剂对土壤（遗传）毒性的影响。与无表面活性剂对照的结果相比，生物反应器处理过的土壤与所有表面活性剂的孵育均会增加PAH的解吸，而除R-95以外的所有土壤均会大大提高PAH的生物降解。 POESH的效果最大，可去除50％的总PAH。 Brij 30，Span 20和POESH在增强四环和五环PAH（包括七种致癌PAH中的五种）的生物降解方面特别有效，清除率高达80％。表面活性剂改性剂也显着增强了烷基-PAHs的去除。大多数处理都显着增加了土壤毒性。如任一突变细胞系所评估的，仅非表面活性剂对照和最佳剂量的Brij 30显着降低了土壤遗传毒性。总体而言，这些发现对实现土壤中PAHs净化水平的生物修复的可行性具有影响。

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  • 来源
    《Environmental Science & Technology》 |2016年第7期|3838-3845|共8页
  • 作者

    Alden C. Adrion; Jun Nakamura; Damian Shea; Michael D. Aitken;

  • 作者单位

    Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States;

    Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States;

    Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina 27695, United States;

    Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States;

  • 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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