Oxidant Delivery Approaches and Contingency Planning
Approaches to deliver oxidants into the subsurface, as well as contingency planning to manage and adapt oxidant delivery systems.
There are a number of oxidant transport mechanisms that are important to understand and consider when selecting, designing, and implementing an in situ chemical oxidation project.
A number of oxidant delivery approaches may be used, including injections wells, direct-push technology probes, sparge points, infiltration systems, recirculation systems, fracturing, mechanical mixing, and horizontal wells. Of these, injection wells and direct-push technology probes are most commonly used.
Each delivery approach has characteristics that may make it most suitable for a particular oxidant and set of site conditions.
The factors and challenges that should be considered when selecting and designing an oxidant delivery approach include aquifer heterogeneity, contaminant distribution, presence of underground utilities, contaminant displacement by the injection of oxidant, and mixing of activators with the oxidant (for those requiring activators).
As a result of the many challenges and uncertainties with delivering oxidants into the subsurface, the Observational Method is often beneficial to achieve the desired performance.
The Observational Method includes establishing appropriate contingency plans during the development of the project. The contingency plan(s) should include an inventory of possible outcomes, development of appropriate monitoring to detect deviations from the assumed conditions, and development of response actions if the deviations occur.
KeywordsClay Permeability Surfactant Drilling Bentonite
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