Dynamic capillary fringes - Central experiment and scientific communication

中心实验设施被设计为所有子项目的三维集成平台。在第一个供资期间，建造了容器，安装了测量装置，并进行了不同水位的测试。子项目中的具体实验是用他们自己的实验装置用不同的多孔介质进行的。在第二个资助期内，所有成员将使用同一个二维流通池详细回答项目特定的问题。容器实验不是通用的，因此使用容器的实验工作的重点将针对CF中自然进化种群的长期观察，其中基本底物供应含有异生物质污染物，例如苯甲酸。当达到稳态条件时，污染物浓度的逐步增加将被启动，生物膜的变化和随后系统的水力行为（生物堵塞）的变化将与2-D实验结果进行比较并记录。地下水位高度的增加会将CF转移到更高的区域，导致氧气限制在下面，对生物膜的稳定性的影响，以及硝酸盐作为唯一或额外的电子受体的影响，将是实验的变化。将研究已建立的细菌群落在达到稳态后对这些组成和降解效率变化的反应。此外，该中心项目旨在与其他科学家传播和讨论研究单位的成果，并计划与德国其他大学的相关研究单位和研究方案举行联合会议。为此目的，将组织国家和国际讲习班，并将维持一个访问计划。

The central experimental facility was designed as a three-dimensional integration platform for all subprojects. In the first funding period, the container was constructed, measuring devices were inserted and test runs with varying water levels were performed. Specific experiments within the subprojects were performed with their “own” experimental set-ups with different porous media. In the second funding period, all members will use the same two-dimensional flow-through cell to answer project-specific questions in detail. The container experiment is not so versatile and thus the focus of the experimental work with the container will be directed towards long-term observations of naturally evolving populations in the CF with a basic substrate supply containing a xenobiotic contaminant such as e.g. benzoic acid. When steady state conditions will be reached, a step-wise increase of the contaminant concentration will be initiated and changes of the biofilm and subsequent changes in the hydraulic behaviour (bio-clogging) of the system will be compared with 2-D experimental results and documented. The influence of an increase in the height of the groundwater table which will shift the CF into higher zones causing oxygen limitation below, on the stability of the biofilm as well as the influence of nitrate as the only or an additional electron acceptor will be experimental variations. The response of the established bacterial community on these changes in terms of composition and degradation efficiency after reaching steady state will be investigated. In addition, the central project aims at disseminating and discussing the results of the research unit with other scientists and joint meetings are planned with related research units and research programs at other universities of Germany. For this purpose, national and international workshops will be organized and a visitor program will be maintained.