A GEOCHEMICAL TRANSPORT MODEL FOR REDOX-CONTROLLED MOVEMENT OF MINERAL FRONTS IN GROUNDWATER-FLOW SYSTEMS - A CASE OF NITRATE REMOVAL BY OXIDATION OF PYRITE

被引：150

作者：

ENGESGAARD, P ^{[1
]}

KIPP, KL ^{[1
]}

机构：

[1] US GEOL SURVEY,DENVER FED CTR,DIV WATER RESOURCES,DENVER,CO 80225

来源：

WATER RESOURCES RESEARCH | 1992年 / 28卷 / 10期

关键词：

D O I：

10.1029/92WR01264

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A one-dimensional prototype geochemical transport model was developed in order to handle simultaneous precipitation-dissolution and oxidation-reduction reactions governed by chemical equilibria. Total aqueous component concentrations are the primary dependent variables, and a sequential iterative approach is used for the calculation. The model was verified by analytical and numerical comparisons and is able to simulate sharp mineral fronts. At a site in Denmark, denitrification has been observed by oxidation of pyrite. Simulation of nitrate movement at this site showed a redox front movement rate of 0.58 m yr-1, which agreed with calculations of others. It appears that the sequential iterative approach is the most practical for extension to multidimensional simulation and for handling large numbers of components and reactions. However, slow convergence may limit the size of redox systems that can be handled.

引用

页码：2829 / 2843

页数：15

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