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Acoustically enhanced multicomponent NAPL ganglia dissolution in water saturated packed columns
Constantinos V Chrysikopoulos1, Eric T Vogler
1Department of Civil and Environmental Engineering, University of California, Irvine, California 92697, USA. costas@eng.uci.edu
Environmental Science & Technology
|June 24, 2004
Summary
Acoustic waves significantly enhance the dissolution of nonaqueous phase liquid (NAPL) mixtures in aquifers. This method shows promise for remediating sites contaminated with NAPLs, especially those with low-solubility components.
Area of Science:
- Environmental Engineering
- Geochemistry
- Acoustics
Background:
- Nonaqueous phase liquids (NAPLs) pose significant challenges for groundwater remediation.
- Understanding dissolution dynamics is crucial for effective aquifer cleanup strategies.
Purpose of the Study:
- To investigate the impact of acoustic pressure waves on multicomponent NAPL ganglia dissolution.
- To evaluate the effectiveness of acoustic waves as an aquifer remediation technology.
Main Methods:
- Laboratory experiments using water-saturated columns packed with glass beads.
- Dissolution tests with two and three-component NAPL mixtures under acoustic wave influence.
- Analysis of dissolution enhancement in relation to acoustic wave frequency and NAPL component solubility.
Main Results:
- Acoustic waves significantly enhance NAPL ganglia dissolution by inducing oscillatory interstitial water velocity.
- Dissolution enhancement is directly proportional to acoustic wave frequency.
- The greatest enhancement is observed for NAPL components with the lowest equilibrium aqueous solubility.
- Square-shaped acoustic waves yield greater dissolution enhancement than sinusoidal or triangular waves.
Conclusions:
- Acoustic wave application is a promising method for aquifer remediation.
- This technique is particularly effective for NAPLs with low-solubility components.
- Acoustic waves offer a novel approach to accelerate the cleanup of contaminated aquifers.