Journal
ADVANCES IN WATER RESOURCES
Volume 38, Issue -, Pages 60-69Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.advwatres.2011.11.004
Keywords
Electrokinetic remediation; Numerical model; In situ chemical oxidation; Oxidant plume concentration; PHT3D
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Funding
- University of Western Australia
- Centre for Groundwater Studies
- Australian Research Council [LP0776887]
- Australian Research Council [LP0776887] Funding Source: Australian Research Council
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A new numerical model is presented that simulates groundwater flow and multi-species reactive transport under hydraulic and electrical gradients. Coupled into the existing, reactive transport model PHT3D, the model was verified against published analytical and experimental studies, and has applications in remediation cases where the geochemistry plays an important role. A promising method for remediation of low-permeability aquifers is the electrokinetic transport of amendments for in situ chemical oxidation. Numerical modelling showed that amendment injection resulted in the voltage gradient adjacent to the cathode decreasing below a linear gradient, producing a lower achievable concentration of the amendment in the medium. An analytical method is derived to estimate the achievable amendment concentration based on the inlet concentration. Even with low achievable concentrations, analysis showed that electrokinetic remediation is feasible due to its ability to deliver a significantly higher mass flux in low-permeability media than under a hydraulic gradient. (C) 2011 Elsevier Ltd. All rights reserved.
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