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Reaction front formation in contaminant plumes.
Laura B Cribbin1, Henry F Winstanley1, Sarah L Mitchell1
1MACSI, University of Limerick, Limerick, Ireland.
Journal of Contaminant Hydrology
|December 3, 2014
Summary
Mathematical modeling explains how bacterial action creates successive fronts in groundwater plumes. This research combines reaction-diffusion theory with a secondary reaction to describe front formation and propagation.
Area of Science:
- Environmental science
- Geochemistry
- Mathematical modeling
Background:
- Groundwater contamination plumes exhibit successive fronts formed by bacterial action.
- The mathematical mechanisms behind these front formations and propagation remain unclear.
Purpose of the Study:
- To mathematically explain the formation and propagation of successive fronts in contaminated groundwater plumes.
- To integrate classical reaction-diffusion theory with a novel secondary reaction mechanism.
Main Methods:
- Utilized classical reaction-diffusion theory with two reactants: oxidant and reductant.
- Incorporated a secondary reaction where a reactant is reformed across the front via product diffusion.
Main Results:
- Developed a mathematical framework to explain front formation and propagation.
- Derived approximate asymptotic solutions for reactant profiles.
- Calculated the propagation rate of the fronts.
Conclusions:
- The combined reaction-diffusion and secondary reaction model successfully explains bacterial-driven front formation in groundwater plumes.
- The derived solutions provide quantitative insights into contaminant transport dynamics.
- This approach offers a clearer mathematical understanding of subsurface contaminant plume evolution.
Keywords:
BioremediationMathematical modelReaction frontReactive transportRedox zonationTerminal electron acceptorsMore Related Videos
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