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首页> 外文期刊>Environmental Science & Technology >Metabolism-Induced CaCO_3 Biomineralization During Reactive Transport in a Micromodel: Implications for Porosity Alteration
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Metabolism-Induced CaCO_3 Biomineralization During Reactive Transport in a Micromodel: Implications for Porosity Alteration

机译：在模型中的反应性运输过程中代谢诱导的CaCO_3生物矿化：孔隙度改变的含义。

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摘要

The ability of Pseudomonas stutzeri strain DCP-Ps1 to drive CaCO_3 biomineralization has been investigated in a microfluidic flowcell (i.e., micromodel) that simulates subsurface porous media. Results indicate that CaCO_3 precipitation occurs during NO_3~- reduction with a maximum saturation index (SI_(calcite)) of ～1.56, but not when NO_3~- was removed, inactive biomass remained, and pH and alkalinity were adjusted to SI_(calcite) ～ 1.56. CaCO_3 precipitation was promoted by metabolically active cultures of strain DCP-Ps1, which at similar values of SI_(calcite), have a more negative surface charge than inactive strain DCP-Psl. A two-stage NO_3~- reduction (NO_3~-→ NO_2~- → N_2) pore-scale reactive transport model was used to evaluate denitrincation kinetics, which was observed in the micromodel as upper (NO_3~- reduction) and lower (NO_2~- reduction) horizontal zones of biomass growth with CaCO_3 precipitation exclusively in the lower zone. Model results are consistent with two biomass growth regions and indicate that precipitation occurred in the lower zone because the largest increase in pH and alkalinity is associated with NO_2~- reduction. CaCO_3 precipitates typically occupied the entire vertical depth of pores and impacted porosity, permeability, and flow. This study provides a framework for incorporating microbial activity in biogeochemistry models, which often base biomineralization only on SI (caused by biotic or abiotic reactions) and, thereby, underpredict the extent of this complex process. These results have wide-ranging implications for understanding reactive transport in relevance to groundwater remediation, CO_2 sequestration, and enhanced oil recovery.
机译：已经在模拟地下多孔介质的微流体流通池（即微模型）中研究了斯氏假单胞菌DCP-Ps1菌株驱动CaCO_3生物矿化的能力。结果表明，CaCO_3沉淀在NO_3〜-还原过程中发生，最大饱和指数（SI_（方解石））为〜1.56，但当NO_3〜-被去除时，不存在生物质，pH和碱度调整为SI_（方解石）时不发生〜1.56。 CaCO_3沉淀是由菌株DCP-Ps1的代谢活性培养物促进的，在SI_（方解石）的相似值下，其表面电荷比非活性菌株DCP-Psl更大。使用两阶段的NO_3〜-还原（NO_3〜-→NO_2〜-→N_2）孔尺度反应迁移模型来评估反硝化动力学，在微观模型中观察到的是较高的（NO_3〜-还原）和较低的（NO_2 （〜-减少）生物量生长的水平区域，而CaCO_3仅在下部区域沉淀。模型结果与两个生物量生长区域一致，并表明降水发生在下部区域，因为pH和碱度的最大增加与NO_2〜-的还原有关。 CaCO_3沉淀物通常占据孔的整个垂直深度，并影响孔隙率，渗透率和流动。这项研究提供了将微生物活性纳入生物地球化学模型的框架，该模型通常仅基于SI（由生物或非生物反应引起）生物矿化作用，从而低估了这一复杂过程的程度。这些结果对于理解与地下水修复，CO_2封存和提高采油率有关的反应性运输具有广泛的意义。

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  • 来源
    《Environmental Science & Technology》 |2015年第20期|12094-12104|共11页
  • 作者

    Rajveer Singh; Hongkyu Yoon; Robert A. Sanford; Lynn Katz; Bruce W. Fouke; Charles J. Werth;

  • 作者单位

    Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States,Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States;

    Geoscience Research and Applications, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States;

    Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States,Department of Geology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States;

    Civil, Architectural and Environmental Engineering, University of Texas at Austin, Austin, Texas 78712, United States;

    Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States,Department of Geology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States;

    Civil, Architectural and Environmental Engineering, University of Texas at Austin, Austin, Texas 78712, 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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