The aim of this thesis was to investigate the impact of a direct oxygen injection as a potential remediation strategy for contaminated aquifers on a bench scale. The mass transfer between a multi-component trapped gas phase and a mobile water phase was studied. Column experiments with dynamically compressed sediments and a direct gas injection of pure oxygen gas were performed. In addition, a new developed kinetic multi-component model was used to describe the experiments. The amount of gas that could be captured in the pore space during direct oxygen injection and the time needed for a complete dissolution of the trapped gas phase were determined. Varying influences of different gases already dissolved in the mobile water phase on the dissolution process of a trapped oxygen gas phase were described for different flow regimes and confirmed by the model results. Finally, on the basis of the experimental and model results obtained in this thesis, predictions for an application of a direct oxygen injection in the field were discussed.

The aim of this thesis was to investigate the impact of a direct oxygen injection as a potential remediation strategy for contaminated aquifers on a bench scale. The mass transfer between a multi-component trapped gas phase and a mobile water phase was studied. Column experiments with dynamically compressed sediments and a direct gas injection of pure oxygen gas were performed. In addition, a new developed kinetic multi-component model was used to describe the experiments. The amount of gas that could be captured in the pore space during direct oxygen injection and the time needed for a complete dissolution of the trapped gas phase were determined. Varying influences of different gases already dissolved in the mobile water phase on the dissolution process of a trapped oxygen gas phase were described for different flow regimes and confirmed by the model results. Finally, on the basis of the experimental and model results obtained in this thesis, predictions for an application of a direct oxygen injection in the field were discussed.