ISOTEC’s persulfate technology uses sodium persulfate, activated by our patented modified Fenton’s reagent, patented carbohydrate (food grade) activation, alkaline reagents (including sodium hydroxide and lime), hydrogen peroxide, our patented chelated iron complex or their combinations to produce sulfate and hydroxyl free radicals that attack contaminants. Persulfate, when used as an in-situ chemical oxidation reagent, is particularly effective at treating contaminants from aromatics like benzene, toluene, ethylbenzene, xylenes; and, chlorinated solvents such as perchloroethene (PCE) and trichloroethene (TCE). ISOTEC uses both injection and soil mixing methods to deliver reagent for environmental remediation.
The reaction mechanism associated with our persulfate-based process is shown below:
S2O82- + Fe2+ → 2SO4●-
Where:
S2O82- = Persulfate (Sodium, Ammonium or Potassium)
SO4●- = Sulfate Radical
COMPARISON OF PERSULFATE ACTIVATION METHODS
| Technology Features | Base Activation | Chelated Iron Activation | Heat Activation | MFR/Peroxide Activation | Carbohydrate Activation |
|---|---|---|---|---|---|
| Aquifer Basification | Yes, pH>10.5 | No | No | No | No |
| Sulfate Radical Production | Yes | Yes | Yes | Yes | Yes |
| Hydroxyl Radical Production | Limited | No | No | Yes | Yes |
| Superoxide Radical Production | Limited | No | No | Yes | Yes |
| Controlled Reaction | Yes | Yes | No | Yes | Yes |
| Bioremediation Stimulation | No | No | No | Yes | Yes |
For our technical brochure, please click here.