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首页> 外文期刊>Environmental Science & Technology >Transverse Bacterial Migration Induced by Chemotaxis in a Packed Column with Structured Physical Heterogeneity
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Transverse Bacterial Migration Induced by Chemotaxis in a Packed Column with Structured Physical Heterogeneity

机译：结构物理异质性填充柱中趋化性引起的横向细菌迁移

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摘要

The significance of chemotaxis in directing bacterial migration toward contaminants in natural porous media was investigated under groundwater flow conditions. A laboratory-scale column, with a coarse-grained sand core surrounded by a finegrained annulus, was used to simulate natural aquifers with strata of different hydraulic conductivities. A chemoattractant source was placed along the central axis of the column to model contaminants trapped in the heterogeneous subsurface. Chemotactic bacterial strains, Escherichia coli HCB1 and Pseudomonas putida F1, introduced into the column by a pulse injection, were found to alter their transport behaviors under the influence of the attractant chemical emanating from the central source. For E. coli HCB1, approximately 18% more of the total population relative to the control without attractant exited the column from the coarse sand layer due to the chemotactic effects of α-methylaspartate under an average fluid velocity of 5.1 m/d. Although P. putida F1 demonstrated no observable changes in migration pathways with the model contaminant acetate underthe same flow rate, when the flow rate was reduced to 1.9 m/d, approximately 6-10% of the population relative to the control migrated from the fine sand layer toward attractant into the coarse sand layer. Microbial transport properties were further quantified by a mathematical model to examine the significance of bacterial motility and chemotaxis under different hydrodynamic conditions, which suggested important considerations for strain selection and practical operation of bioremediation schemes.
机译：在地下水流动条件下，研究了趋化作用在引导细菌向天然多孔介质中的污染物迁移过程中的重要性。实验室规模的柱子，其粗粒状砂芯被细粒状环带包围，用于模拟具有不同水力传导率的地层。沿色谱柱的中心轴放置一个化学引诱源，以模拟捕获在异质地下的污染物。发现通过脉冲注入引入色谱柱的趋化细菌菌株HCB1和恶臭假单胞菌F1在中心源发出的引诱剂化学物的影响下改变了它们的运输行为。对于大肠杆菌HCB1，由于α-甲基天冬氨酸在5.1 m / d的平均流速下的趋化作用，相对于没有引诱剂的对照，总种群约有18％从粗砂层中逸出。尽管恶臭假单胞菌F1在相同流速下没有显示出模型乙酸乙酸盐在迁移途径上没有可观察到的变化，但是当流速降低至1.9 m / d时，相对于对照从细粉迁移的种群约占6-10％砂层向引诱剂进入粗砂层。通过数学模型进一步量化了微生物的运输特性，以检验在不同水动力条件下细菌运动性和趋化性的重要性，这为菌株选择和生物修复方案的实际操作提出了重要的考虑因素。

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  • 来源
    《Environmental Science & Technology》 |2009年第15期|5921-5927|共7页
  • 作者

    MENG WANG; ROSEANNE M. FORD;

  • 作者单位

    Department of Chemical Engineering, University of Virginia, Charlottesville, Virginia 22904;

    Department of Chemical Engineering, University of Virginia, 102 Engineers' Way, P.O. Box 400471, Charlottesville, VA 22904-4741;

  • 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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