In-House Treatability Evaluations
In order to determine the most effective chemical treatment process and dosing, Eden routinely recommends treatability testing performed in our in-house laboratory. These studies are specifically designed to aid the client in field applications and generally involve basic batch runs (jar tests) versus more elaborate column tests used in research funded projects. Batch reactors are created using soil and groundwater slurries combined with chemical amendments and allowed to incubate for fixed time periods. Contaminant destruction is evaluated using third party laboratory testing.
Treatability studies are most often performed for oxidant selection and typically require -30- to -45- days to complete. Longer test durations are generally required for chemical reductants and bio-amendments. The findings of the treatability studies are used by Eden professionals to develop preliminary treatment designs.
A treatability evaluation was conducted for an active truck/gasoline station with petroleum constituents present in both soils and groundwater. Several reactors were prepared and evaluated. As displayed on the graph below, the most effective reactor was 1% potassium permanganate, and least effective was calcium peroxide/ferric citrate.
Following the treatability findings, we developed a detailed scope of work based on the findings including the proposed treatment area and suggested oxidant dosing. In this case, a surfactant injection followed by a permanganate injection was suggested.