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首页> 外文期刊>Environmental Science & Technology >Bioturbation Delays Attenuation of DDT by Clean Sediment Cap but Promotes Sequestration by Thin-Layered Activated Carbon
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Bioturbation Delays Attenuation of DDT by Clean Sediment Cap but Promotes Sequestration by Thin-Layered Activated Carbon

机译：生物扰动通过清洁的泥沙盖延迟了滴滴涕的衰减，但通过薄层活性炭促进了螯合

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摘要

The effects of bioturbation on the performance of attenuation by sediment deposition and activated carbon to reduce risks from DDT-contaminated sediment were assessed for DDT sediment-water flux, biouptake, and passive sampler (PE) uptake in microcosm experiments with a freshwater worm, Lumbriculus variegatus. A thin-layer of clean sediment (0.5 cm) did not reduce the DDT flux when bioturbation was present, while a thin (0.3 cm) AC cap was still capable of reducing the DDT flux by 94%. Bioturbation promoted AC sequestration by reducing the 28-day DDT biouptake (66%) and DDT uptake into PE (＞99%) compared to controls. Bioturbation further promoted AC-sediment contact by mixing AC particles into underlying sediment layers, reducing PE uptake (55%) in sediment compared to the AC cap without bioturbation. To account for the observed effects from bioturbation, a mass transfer model together with a biodynamic model were developed to simulate DDT flux and biouptake, respectively, and models confirmed experimental results. Both experimental measurements and modeling predictions imply that thin-layer activated carbon placement on sediment is effective in reducing the risks from contaminated sediments in the presence of bioturbation, while natural attenuation process by dean sediment deposition may be delayed by bioturbation.
机译：在淡水蠕虫Lumbriculus的缩影实验中，评估了生物扰动对沉积物沉积和活性炭的衰减性能的影响，以减少DDT污染的沉积物的风险，以评估DDT沉积物的水通量，生物吸收和被动采样器（PE）的吸收。 variegatus。存在生物扰动时，薄薄的干净沉积物（0.5厘米）不会降低DDT通量，而薄的（0.3厘米）AC盖仍能够将DDT通量降低94％。与对照组相比，生物扰动通过减少28天的DDT生物吸收（66％）和DDT对PE的吸收（> 99％）促进了AC隔离。与没有生物扰动的AC帽相比，生物扰动通过将AC颗粒混合到下面的沉积物层中进一步促进了AC沉积物的接触，从而减少了沉积物中PE的吸收（55％）。为了说明观察到的来自生物扰动的影响，开发了一个传质模型和一个生物动力学模型来分别模拟DDT通量和生物吸收，并且该模型证实了实验结果。实验测量和模型预测均暗示在生物扰动下将薄层活性炭放置在沉积物上可有效降低污染的沉积物的风险，而通过生物扰动可能会延缓院长沉积物沉积的自然衰减过程。

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  • 来源
    《Environmental Science & Technology》 |2014年第2期|1175-1183|共9页
  • 作者

    Diana Lin; Yeo-Myoung Cho; David Werner; Richard G. Luthy;

  • 作者单位

    Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, United States;

    Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, United States;

    School of Civil Engineering and Geoscience, Newcastle University, Newcastle upon Tyne NE1 7RU, England, U.K.;

    Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, 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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