Assessing the sustainability of iron clay mineral redox reactions for application in engineered systems

地表水和地下水的质量受到含铁矿物氧化还原反应的强烈影响，这些反应会转化污染物和营养物质。含铁粘土矿物特别重要，因为它们被认为是环境中可再生的还原当量来源。在这个项目中，我们将测试这个范例的有效性，并将当前知识从封闭系统扩展到更现实、更流畅的条件。具体地说，我们将研究粘土矿物氧化还原反应的可逆性；氧化还原循环对粘土矿物稳定性和反应性的影响；以及化学、微生物和生物中介粘土矿物铁还原之间的差异。我们将通过对所涉及的过程进行定量建模来补充我们的实验工作。该项目的成果将有助于设计有效的(自然)补救战略以及工程水系统，如含水层储存和回收。

The quality of surface and groundwater is strongly influenced by redox reactions of iron-bearing minerals, which transform contaminants and nutrients. Iron-bearing clay minerals are particularly important because they are thought to be a renewable source of reduction equivalents in the environment. In this project, we will test the validity of this paradigm and expand current knowledge from closed systems to more realistic, flow-through conditions. Specifically, we will investigate aspects of reversibility of clay mineral redox reactions; the effect of redox cycling on clay mineral stability and reactivity; and differences between chemical, microbial, and biologically mediated clay mineral iron reduction. We will complement our experimental work with quantitative modeling of the processes involved. The results of this project will aid in designing effective (natural) remediation strategies as well as engineered water systems such as aquifer storage and recovery.