Interactions of Toxic Trace Metals with Multi-Component Biofilms: A Mechanistic Approach

有毒痕量金属与多组分生物膜相互作用的机理研究这是对根据美国国家科学基金会第86-17408号拨款开展的研究的续期奖励，该研究涉及水溶液中镉和铅在已被生物膜覆盖的固体表面上的吸附行为。结果导致了一个基于力学的结构化模型的发展，该模型可以用于预测这些金属在由单一细菌物种、其胞外聚合物和固体表面组成的实验系统中在恒定pH和离子强度条件下的行为。更新项目的目标是通过引入铁作为竞争痕量金属来扩展这一方法，以提供更类似于在自然环境中发现的条件的复杂性，在自然环境中，金属吸附到固体表面具有环境意义。这项研究的结果有望加深对影响固体表面生物膜形成因素的认识，包括用于废水处理的固定膜、生物膜反应器。在这个项目中获得的见解有望改进污水处理固定膜工艺的工程设计，并可用于比目前更好地了解自然地表下沉积物中生物膜的形成机理。在影响地下水污染物移动的水域和地下岩层中。

Interactions of Toxic Trace Metals With Multi-Component Biofilms: A Mechanistic Approach. This is a renewal award for support of research conducted under NSF Grant No. 86-17408 on the adsorption behavior of cadmium and lead in water solution to solid surfaces that had become coated with biofilms. Results led to development of a mechanistically-based, structured model that can be used to predict the behavior of these metals in an experimental system consisting of a single bacterial species, its extracellular polymer and a solid surface under conditions of constant pH and ionic strength. The objective of the renewal project is to extend this approach by introduction of ferric iron as a competing trace metal to provide a degree of complexity more analagous to conditions found in the natural environment where adsorption of metals to solid surfaces is of environmental significance. Results of this research are expected to develop knowledge of factors that influence the formation of biofilms on solid surfaces including fixed-film, biofilm reactors that are used for the treatment of wastewaters. Insights obtained during this project are expected to lead to improvements in the engineering design of fixed-film processes for wastewater treatment and may be applied to obtaining a better understanding than now exists of mechanisms for biofilm formation in sediments underlying natural surface waters and in subsurface formations that affect the movement of groundwater pollutants.