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首页> 外文期刊>Environmental Science & Technology >Influence of Perfluorooctanoic Acid on the Transport and Deposition Behaviors of Bacteria in Quartz Sand
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Influence of Perfluorooctanoic Acid on the Transport and Deposition Behaviors of Bacteria in Quartz Sand

机译：全氟辛酸对细菌在石英砂中迁移和沉积行为的影响

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摘要

The significance of perfluorooctanoic acid (PFOA) on the transport and deposition behaviors of bacteria (Gram-negative Escherichia coli and Gram-positive Bacillus subtilis) in quartz sand is examined in both NaCl and CaCl_2 solutions at pH 5.6 by comparing both breakthrough curves and retained profiles with PFOA in solutions versus those without PFOA All test conditions are found to be highly unfavorable for cell deposition regardless of the presence of PFOA; however, 7%-46% cell deposition is observed depending on the conditions. The cell deposition may be attributed to micro- or nanoscale roughness and/or to chemical heterogeneity of the sand surface. The results show that, under all examined conditions, PFOA in suspensions increases cell transport and decreases cell deposition in porous media regardless of cell type, presence or absence of extracellular polymeric substances, ionic strength, and ion valence. We find that the additional repulsion between bacteria and quartz sand caused by both acid-base interaction and steric repulsion as well as the competition for deposition sites on quartz sand surfaces by PFOA are responsible for the enhanced transport and decreased deposition of bacteria with PFOA in solutions.
机译：通过比较穿透曲线和保留曲线，研究了在pH 5.6的NaCl和CaCl_2溶液中，全氟辛酸（PFOA）对细菌（革兰氏阴性大肠杆菌和革兰氏阳性枯草芽孢杆菌）在石英砂中的迁移和沉积行为的重要性。在溶液中使用PFOA的情况与不使用PFOA的情况相比，无论是否存在PFOA，所有测试条件都非常不利于细胞沉积。然而，取决于条件，观察到7％-46％的细胞沉积。细胞的沉积可归因于微米或纳米级的粗糙度和/或沙表面的化学异质性。结果表明，在所有检查的条件下，悬浮液中的PFOA均可增加细胞运输并减少多孔介质中的细胞沉积，而与细胞类型，是否存在细胞外聚合物，离子强度和离子价无关。我们发现，由酸碱相互作用和空间排斥引起的细菌与石英砂之间的额外排斥以及PFOA在石英砂表面上对沉积位点的竞争导致溶液中PFOA增强了细菌的运输并减少了细菌的沉积。 。

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  • 来源
    《Environmental Science & Technology》 |2016年第5期|2381-2388|共8页
  • 作者

    Dan Wu; Meiping Tong; Hyunjung Kim;

  • 作者单位

    The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, P. R. China;

    The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, P. R. China;

    Department of Mineral Resources and Energy Engineering, Chonbuk National University, Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 561-756, Republic of Korea;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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