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Improved Method for Estimating Reaction Rates During Push-Pull Tests
Charles J Paradis1,2, Emma R Dixon3, Lauren M Lui4
1Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN.
Ground Water
|April 16, 2018
Summary
A new method improves solute reaction rate estimation in push-pull tests by accurately adjusting breakthrough curves for fluid dilution. This approach overcomes limitations of conventional methods, providing more reliable reactivity assessments in groundwater studies.
Area of Science:
- Environmental Science
- Hydrogeology
- Geochemistry
Background:
- Single-well push-pull tests are used to study solute transport and reactions in aquifers.
- Conventional methods for analyzing breakthrough curves assume equal solute concentration ratios, which can lead to inaccuracies.
- Inaccurate breakthrough curves can result in erroneous conclusions about solute reactivity.
Purpose of the Study:
- To develop a new theoretical method for generating dilution-adjusted breakthrough curves.
- To account for varying concentrations of nonreactive and reactive solutes in injection and aquifer fluids.
- To improve the accuracy of reaction rate estimations from push-pull tests.
Main Methods:
- Theoretical development of a novel dilution-adjusted breakthrough curve method.
- Application of the new method to a field-based dataset.
- Comparison of results with conventional dilution-adjusted methods.
Main Results:
- The new method accurately generates dilution-adjusted breakthrough curves.
- The improved method accounts for any combination of solute concentrations.
- Field data analysis demonstrated the enhanced accuracy of the new approach.
Conclusions:
- The developed method provides a simple and robust way to analyze push-pull test data.
- It eliminates the need for assumptions about initial solute concentrations.
- This facilitates more accurate estimation of solute reaction rates in various hydrogeological settings.
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