Macro-scale modeling concepts for bacterial growth and transport in advective two-phase porous media systems

平流两相多孔介质系统中细菌生长和运输的宏观建模概念

• 批准号: 433108788
• 负责人: Dr.-Ing. Birger Hagemann
• 金额: --
• 依托单位: Institut für Erdöl- und Erdgastechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/433108788?language=en
• 关键词: Macro; scale; modeling; concepts; bacterial

Porous media provide excellent living conditions for bacteria because their habitat is protected but still allows a continuous nutrient supply. As a consequence, microorganisms exist and make a substantial contribution to many environmental and engineered porous media systems. When these porous media systems are used for engineered or industrial applications it is important to understand the interaction between flow, transport and microbiological processes. A variety of modeling methods exists in the literature, but they were predominantly developed for single-phase porous media systems. Since, in addition, the opaque nature of porous media makes it difficult to observe and understand bacterial processes which occur in the pores (e.g. attachment/detachment and formation of biofilms), these processes are insufficiently understood.In this project artificial porous structures between two glass plates, referred to as glass-silicon-glass micromodels, will be applied to investigate the behavior of bacteria in porous media saturated by two phases. These transparent quasi two-dimensional micromodels allow the direct observation of bacterial processes, as e.g. growth, transport, and attachment/detachment, by microscopic analysis. The bacteria used for laboratory experiments belong to the class of methanogenic archaea. The detailed interpretation of the experimental results by image processing will allow to generate spatially and temporally resolved data of bacterial counts and their structure and movement. An improved mathematical model describing the bacterial growth and movement in two-phase porous media systems will be developed based on these data sets. The model intends to consider the bacterial growth under non-nutrient limited conditions, the existence of different bacterial structures (plankton and biofilm), their individual transport properties and attachment and detachment processes. For testing and parametrizing the newly developed model, it will be numerically implemented based on a diagonally implicit Runge-Kutta time discretization method which is well suited to incorporate the strong non-linear source terms.The application of the theoretical model is devoted to the technology of microbial underground methanation, which leads to the transformation of the injected hydrogen and carbon dioxide to methane by intensive bacterial reactions.

多孔培养基为细菌提供了良好的生活条件，因为它们的栖息地得到了保护，但仍然允许持续的营养供应。结果，微生物存在，并为许多环境和工程的多孔媒体系统做出了重大贡献。当这些多孔媒体系统用于工程或工业应用时，重要的是要了解流量，运输和微生物过程之间的相互作用。文献中存在多种建模方法，但主要是针对单相多孔介质系统开发的。此外，由于多孔媒体的不透明性质使观察和理解毛孔中发生的细菌过程（例如，依恋/脱离和生物膜的形成），这些过程不足以理解。在两个玻璃板之间的人造多孔结构在两个玻璃板之间，被称为玻璃中的玻璃胶片，将其表现为玻璃胶片微型媒体，并在两种情况下进行了媒体媒体的调查。这些透明的准二维微型模型允许直接观察细菌过程，例如通过微观分析，生长，运输和附着/分离。用于实验室实验的细菌属于甲烷古细菌的类别。图像处理对实验结果的详细解释将允许生成细菌计数的空间和时间分析数据及其结构和运动。将根据这些数据集开发一个改进的数学模型，描述了两相多孔介质系统中细菌生长和运动。该模型旨在考虑在非营养有限条件下的细菌生长，存在不同细菌结构（浮游生物和生物膜），其单个运输特性以及附着和脱离过程。 For testing and parametrizing the newly developed model, it will be numerically implemented based on a diagonally implicit Runge-Kutta time discretization method which is well suited to incorporate the strong non-linear source terms.The application of the theoretical model is devoted to the technology of microbial underground methanation, which leads to the transformation of the injected hydrogen and carbon dioxide to methane by intensive bacterial reactions.