FREQUENTLY ASKED QUESTIONS

Contaminate Treatment

Where do I get information if my contaminants of concern have been treated by ISOTEC in the past?

Please follow the link contaminant treatability to download the calculator that has information on contaminant treatment. If your contaminant of concern is not listed or you need additional information, please contact us.

What is your experience with the mobilization and control of DNAPLs resulting from your process?

The ISOTEC chemical oxidation process is a contact remedial treatment and works through contaminant desorption from the soil phase followed by oxidation in the aqueous phase. When injecting ISOTEC reagents into DNAPL areas, a conversion from DNAPL into dissolved phase will occur. Therefore, a thorough investigation must be completed at a site prior to remedial activities to determine the plume contaminant mass in the area to be treated. Once the plume mass has been calculated, a sufficient amount of reagents can be calculated to treat the contaminants in these areas.

ISOTEC has noted on some projects an increase in VOC concentrations after a chemical oxidation application. This scenario indicates the presence of large amounts of residual contamination bound to the soil matrix in the vicinity of treatment area or monitoring points. Such increases are caused by the desorption process of organics from the site soils and initial reagent quantities calculated not being sufficient to oxidize all organic contamination which may have been present in the treatment area. This is overcome by additional injection points and/or treatment applications, plus an increase in reagent volume injected.

If an unknown quantity of DNAPL is present in the portion of the site area tested, it is difficult to calculate the exact number of injections and/or quantity of reagent required to complete a remedial cleanup using chemical oxidation. However, ISOTEC will be better able to determine these amounts once the treatment program has commenced and initial data and trends can be evaluated.

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