地下水中铀的反应运移模拟

地下水中铀的反应运移模拟对地下水保护和铀矿区的恢复都很重要, 因为铀是一种化学毒害性很高的放射性元素.在地下水及水与固体之间都应考虑对流、弥散、稀释、吸附等化学相互作用.介绍了德国德累斯顿市附近的Koenigstein矿区淋滤条件的可行性研究结果.由于反应运移模拟需占用大量的CPU时间, 所有的运行在一天内完成, 但用简单的混合法进行了稀释.对于这种研究, PHREEQC 2.2证明是一个功能很强的工具.与PHREEQC相对应的数据库WATEQ4F涉及到48种元素、400多种物质、300多种矿物.根据铀和镭的特性, 对其作了一定的修改, 以使它更具相容性和可靠性. 

REACTIVE TRANSPORT MODELING OF URANIUM IN GROUNDWATER

Modeling migration of uranium in groundwater is important for both groundwater protection and rehabilitation strategies of uranium mining sites due to the fact that uranium is both a radioactive element and an element with high chemical toxicity. Advection, dispersion, dilution, sorption and chemical interactions both in water and between water and solids have to be taken into account. This paper presents results which have been done in the context of the feasibility study for the in situ leaching mine Koenigstein near Dresden (Germany). Since reactive transport modeling is consuming a lot of CPU time all runs were performed 1 d but taken into account dilution by means of a simple mixing approach. PHREEQC version 2.2 proved to be a powerful tool for this kind of investigations. The database WATEQ4F which comes with PHREEQC containing 48 elements, more than 400 species and more than 300 minerals, was modified with respect to uranium and radium making it more consistent and reliable.