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首页> 外文期刊>Environmental Science & Technology >Modeling Transport of Chemotactic Bacteria in Granular Media with Distributed Contaminant Sources
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Modeling Transport of Chemotactic Bacteria in Granular Media with Distributed Contaminant Sources

机译：趋化性细菌在颗粒状介质中的分布与污染物的运输模型

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摘要

Chemotaxis has the potential to improve bioremediation strategies by enhancing the transport of pollutant-degrading bacteria to the source of contamination, leading to increased pollutant accessibility and biodegradation. This computational study extends work reported previously in the literature to include predictions of chemotactic bacterial migration in response to multiple localized contaminant sources within porous media. An advection-dispersion model, in which chemotaxis was represented explicitly as an additional advection-like term, was employed to simulate the transport of bacteria within a sand-packed column containing a distribution of chemoattractant sources. Simulation results provided insight into attractant and bacterial distributions within the column. In particular, it was found that chemotactic bacteria exhibited a distinct biased migration toward contaminant sources that resulted in a 30% decrease in cell recovery, and concomitantly an enhanced retention within the sand column, compared to the nonchemotactic control. Model results were consistent with experimental observations. Parametric studies were conducted to provide insight into the influence of chemotaxis parameters on bacterial migration and cell percent recovery. The model results provide a better understanding of the effect of chemotaxis on bacterial transport in response to distributed contaminant sources.
机译：趋化性有可能通过增强将降解污染物的细菌转移到污染源来改善生物修复策略，从而增加污染物的可及性和生物降解性。这项计算研究扩展了先前文献中报道的工作，以包括对趋化细菌迁移的预测，以响应多孔介质内的多个局部污染物源。采用平流-分散模型，其中趋化性明确表示为一个附加的平流类术语，用于模拟细菌在含化学引诱剂分布的填沙塔中的运输。模拟结果提供了有关色谱柱内引诱剂和细菌分布的见解。特别地，发现与非趋化性对照相比，趋化性细菌向污染物源表现出明显的偏向迁移，这导致细胞回收率降低30％，并同时提高了沙柱内的保留率。模型结果与实验观察结果一致。进行了参数研究，以深入了解趋化性参数对细菌迁移和细胞百分比恢复的影响。该模型结果更好地了解了趋化性对响应于分布式污染物源的细菌运输的影响。

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  • 来源
    《Environmental Science & Technology》 |2017年第24期|14192-14198|共7页
  • 作者

    Adadevoh Joanna S. T.; Ostvar Sassan; Wood Brian; Ford Roseanne M.;

  • 作者单位

    Univ Virginia, Dept Chem Engn, Charlottesville, VA 22904 USA;

    Oregon State Univ, Sch Chem Biol & Environm Engn, Corvallis, OR 97331 USA;

    Oregon State Univ, Sch Chem Biol & Environm Engn, Corvallis, OR 97331 USA;

    Univ Virginia, Dept Chem Engn, Charlottesville, VA 22904 USA;

  • 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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