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首页> 外文期刊>Environmental Science & Technology >Transverse Mixing Enhancement due to Bacterial Random Motility in Porous Microfluidic Devices
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Transverse Mixing Enhancement due to Bacterial Random Motility in Porous Microfluidic Devices

机译：多孔微流体装置中细菌随机运动引起的横向混合增强

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摘要

Bacterial swimming in groundwater may create flow disturbances in the surrounding microenvironment thereby enhancing contaminant mixing. Porous microfluidic devices (MFDs) were fabricated in three different pore geometry designs: uniform grain size with large pore throats (MFD-I), nonunifonn grain size with restricted pore space (MFD-II), and uniform grain size with small pore throats (MFD-III). Escher-ichia ali HCB33 was used to assess the effect of bacterial random motility on transverse mixing of a tracer, fluorescent labeled dextran, under three experimental conditions in which motile bacteria, nonmotile bacteria, and plain buffer susp- ensions were flown through the MFDs at four different now rates. Mixing was quantified in terms of the best-fit elective transverse dispersion coefficient ((D_(cy))_(eff)).Amixing enhancement index (MEI) was defined as the ratio of the (D_(cy))_(eff) of tracer in experiments with motile bacteria and without bacteria. Motile bacteria caused a maximum 5-6 fold increase in MEI in MFD II, a nearly 4-fold increase in MFD-I, and very little observed change in MFD-III. The apparent transverse dispersivities (a_(app)) of MFD-II and MFD-I increased by 3 and 2.3 times, respectively, with no change in MFD-III. These observations indicate that both pore throat size and pore arrangement are critical factors for contaminant mixing in porous media.
机译：地下水中的细菌游动会在周围的微环境中产生流动扰动，从而增强污染物的混合。多孔微流体装置（MFD）以三种不同的孔几何结构设计制造：具有大孔喉的均匀晶粒尺寸（MFD-I），具有受限孔空间的非均质晶粒尺寸（MFD-II）和具有小孔喉的均匀晶粒尺寸（MFD-II） MFD-III）。在三种实验条件下，运动菌，非运动菌和普通缓冲液悬浮液通过MFD，在三种实验条件下，使用埃希氏菌属ali HCB33评估细菌随机运动对示踪剂，荧光标记的葡聚糖的横向混合的影响。现在有四种不同的费率。混合是根据最佳拟合的选择性横向色散系数（（D_（cy））_（eff））来量化的。混合增强指数（MEI）被定义为（D_（cy））_（eff）的比率示踪剂在有运动细菌和无细菌的实验中的应用。运动性细菌在MFD II中导致MEI最多增加5-6倍，在MFD-I中增加近4倍，而观察到的MFD-III变化很小。 MFD-II和MFD-I的表观横向分散度（a_（app））分别增加了3倍和2.3倍，而MFD-III没有变化。这些观察结果表明，孔喉的大小和孔的排列都是在多孔介质中污染物混合的关键因素。

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  • 来源
    《Environmental Science & Technology》 |2011年第20期|p.8780-8787|共8页
  • 作者

    Rajveer Singh; Mira Stone Olson;

  • 作者单位

    Department of Civil, Architectural, and Environmental Engineering, Drexel University, 3141 Chestnut Street, Philadelphia,Pennsylvania 19104, United States;

    Department of Civil, Architectural, and Environmental Engineering, Drexel University, 3141 Chestnut Street, Philadelphia,Pennsylvania 19104, 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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