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Microbial kinetics of anode-respiring bacteria.

机译：阳极呼吸细菌的微生物动力学。

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摘要

Anode-respiring bacteria (ARB) are of special importance for their ability to directly generate an electrical current from organic compounds, by transferring electrons from the substrate to a solid anode. Using microbial fuel cells or electrolysis cells (MXCs), ARB can be utilized to convert organic wastes into a renewable energy source. Various processes were characterized that determine the microbial kinetics of ARB, including substrate consumption, electron transport and proton transport. Of the various substrates tested, ARB in our system were able to consume acetate most effectively, while other substrates, such as ethanol, appeared to be fermented to acetate and hydrogen before being consumed by ARB.;Proton transport proved to be an important kinetic limitation under typical experimental conditions, which resulted in a decrease in pH inside the biofilm anode and ARB inhibition. On the other hand, extracellular electron transport (EET) carried out by ARB was fast and was carried out with minimal potential losses, as characterized by electrochemical data fitting using the Nernst-Monod relationship. The fast EET kinetics demonstrates ARB's ability to produce an extracellular conductive matrix that is able to transfer electrons from the ARB to the anode surface with minimal potential losses. Using an electrochemical control of the anode potential, ARB communities were selected from wastewater that are able to produce high current densities at low anode potentials, which is an important requirement for MXC feasibility. The characterization of ARB kinetics will be an invaluable tool for the development of MXC commercial applications.
机译：阳极呼吸细菌（ARB）特别重要，因为它们能够通过将电子从基质转移到固体阳极上而直接从有机化合物中产生电流。通过使用微生物燃料电池或电解池（MXC），ARB可用于将有机废物转化为可再生能源。各种过程的特征决定了ARB的微生物动力学，包括底物消耗，电子传输和质子传输。在测试的各种底物中，我们系统中的ARB能够最有效地消耗乙酸盐，而其他底物（例如乙醇）似乎在被ARB消耗之前先被发酵成乙酸盐和氢气。;质子传输被证明是重要的动力学限制在典型的实验条件下，会导致生物膜阳极内部的pH值降低和ARB抑制。另一方面，ARB进行的细胞外电子传输（EET）速度快，并且电势损失最小，这是通过使用Nernst-Monod关系的电化学数据拟合来表征的。快速的EET动力学证明了ARB具有产生细胞外导电基质的能力，该基质能够以最小的电势损失将电子从ARB转移到阳极表面。使用阳极电位的电化学控制，从能够在低阳极电位下产生高电流密度的废水中选择ARB群落，这是MXC可行性的重要要求。 ARB动力学的表征将是开发MXC商业应用的宝贵工具。

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  • 作者

    Torres, Cesar Ivan.;

  • 作者单位

    Arizona State University.;

  • 授予单位 Arizona State University.;
  • 学科 Biology Microbiology.;Engineering Environmental.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 232 p.
  • 总页数 232
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 微生物学;环境污染及其防治;
  • 关键词

  • 入库时间 2022-08-17 11:37:37

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