Electrical Resistive Soil Heating
Electro-Thermal Dynamic Stripping Process (ET-DSPTM) is an electrical resistive soil and groundwater heating technique which utilizes standard grid-supplied 3-phase electrical power. Electrodes are installed within standard auger borings and then connected to the power delivery supply. The moisture in the interstitial pore spaces of the soil acts as a conducting medium for the current to pass from electrode to electrode. Depending on the soil type and moisture content, temperatures approaching the boiling point of water can be achieved in the subsurface within a short period of time.
EPA APPROVED TECHNOLOGY
Electrical resistive soil heating is an EPA-approved technology and has been used successfully to remediate sites impacted by chlorinated solvents, petroleum hydrocarbons, PAH?s and other contaminants.
The ET-DSPTM is a tremendously versatile process and can be attempted at almost any site, regardless of soil type, where conventional in-situ remediation techniques are being applied. ET-DSPTM is effective in desorbing contaminants from the soil particles both above and below the groundwater table and can reduce dissolved-phase contamination. This technology is not limited by contaminant zone thickness or geometry, and can be applied at depths in excess of 30 m. The unique electrode design enables the electrode to be buried below grade; therefore, the system can be installed under buildings (vertical or horizontal electrodes), in high traffic sites, within streets, and in populated areas.
ET-DSPTM remediates contaminants by; increasing the vapour pressure of volatile and semi-volatile compounds, decreasing the viscosity of liquid phase contaminants which have low vapour pressures (to enhance liquid product recovery), and increasing microbiological populations. These characteristics enable the ETDSPTM system to be used economically on soils and groundwater impacted with contaminants ranging from benzene to creosotes.
SAFE, EFFICIENT, AND FAST
Each ET-DSPTM system is computer controlled and installed with our proprietary Thermal Protection System (TSP). This system ensures safety around operating fuelling systems (tanks and distribution lines). Heating the soil and groundwater can decrease site remediation time from years to months, make vapour extraction, multi-phase extraction, and sparging feasible in soils where they would not have normally been considered. Heating of the soil increases permeability in silts and clays, increases radius of influence for extracting and sparging, thereby decreasing capital costs for well installations.