INL SFA program is directed at developing knowledge that can be used for the remediation of subsurface metal contaminants through stimulation of mineral precipitation formation.
Strategy: The INL SFA program is built upon a framework of five experimental campaigns. Each campaign is characterized by a different reactant mixing geometry, and represents a reactant delivery strategy that could be used in the field. They are:
|| In situ reactant generation: One or more reactants are generated in situ from precursor compounds|
| Pre-mix: All required reactants are mixed immediately prior to injection
|| Sequential injection: Separate solutions containing reaction components are injected at the same point, at separate times|
| Parallel injection: Separate reactant solutions are injected at different locations simultaneously, and mixing occurs at the interface of the two parallel solutions
||Gas phase injection: A gaseous but water-soluble reactant is injected into unsaturated media overlying a saturated zone|
Structure: Each experiment campaign relies on contributions from four integrated Research Elements (RE). They are:
1) Transport/Precipitation Coupling in Porous Media (flow cell experiments),
2) Basic Processes and Parameters (characterization of fundamental processes),
3) Model Application, Validation, and Improvement (pre- and post-experimental simulations), and
4) Sensing Methods (using electrical and electromagnetic geophysical methods).