期刊
JOURNAL OF CONTAMINANT HYDROLOGY
卷 138, 期 -, 页码 15-21出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jconhyd.2012.06.005
关键词
Reactive transport; Porous media; Experiments; Modeling
资金
- High Council for Scientific and Technological Cooperation between France and Israel (Project Research Networks Program in Water Science, Resources Management)
We perform laboratory scale reactive transport experiments involving acid-basic reactions between nitric acid and sodium hydroxide. A two-dimensional experimental setup is designed to provide continuous on-line measurements of physico-chemical parameters such as pH, redox potential (Eh) and electrical conductivity (EC) inside the system under saturated flow through conditions. The electrodes provide reliable values of pH and EC while sharp fronts associated with redox potential dynamics could not be captured. Care should be taken to properly incorporate within a numerical model the mixing processes occurring inside the electrodes. The available observations are modeled through a numerical code based on the advection-dispersion equation. In this framework, EC is considered as a variable behaving as a conservative tracer and pH and Eh require solving the advection dispersion equation only once. The agreement between the computed and measured pH and EC is good even without recurring to parameters calibration on the basis of the experiments. Our findings suggest that the classical advection-dispersion equation can be used to interpret these kinds of experiments if mixing inside the electrodes is adequately considered. (c) 2012 Elsevier B.V. All rights reserved.
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