EEC - Dual-Phase Extraction

Dual-Phase Extraction

Dual-Phase Extraction (DPE) systems can be effective in removing free product from the subsurface, thereby reducing concentrations of petroleum hydrocarbons in both the saturated and unsaturated zones of the subsurface. In addition to directly removing free product and vapors, DPE systems have the added benefit of stimulating biodegradation of petroleum constituents in the unsaturated zone by increasing the supply of oxygen.

EEC's mobile dual-phase extraction trailer

How does DPE work?
A dual-phase extraction system generates a high vacuum which is applied to the recovery wells through a sealed well cap and drop tube. The drop tube, generally 1”-2” PVC, extends through the cap and into the well to a depth at which the water level is desired to be maintained. The high vacuum generated by the dual-phase extraction pump pulls the liquid in the well out, drawing down the water table. When the water table is drawn down to the bottom of the drop tube, a vacuum is created within the well casing. Vapors are then pulled out of the well and out of surrounding soils. As water recharges in the well, it is drawn up and out of the drop tube maintaining both the water level, and the vacuum within the well casing.

EEC Mobile Unit

If your site needs dual-phase extraction, EEC can come to you. Our fully equipped mobile trailer has everything we need to take care of your DPE needs.

Earth Environmental Consultants, Inc.

375 Franklin Street

Rocky Mount, VA 24151

540-483-5975 ● FAX 540-483-2221 ● 888-663-9719

earth@earthenv.com

Copyright 1998-2006 Earth Environmental Consultants, Inc.

Dual-Phase Extraction (DPE) systems can be effective in removing free product from the subsurface, thereby reducing concentrations of petroleum hydrocarbons in both the saturated and unsaturated zones of the subsurface. In addition to directly removing free product and vapors, DPE systems have the added benefit of stimulating biodegradation of petroleum constituents in the unsaturated zone by increasing the supply of oxygen.		EEC's mobile dual-phase extraction trailer
How does DPE work? A dual-phase extraction system generates a high vacuum which is applied to the recovery wells through a sealed well cap and drop tube. The drop tube, generally 1”-2” PVC, extends through the cap and into the well to a depth at which the water level is desired to be maintained. The high vacuum generated by the dual-phase extraction pump pulls the liquid in the well out, drawing down the water table. When the water table is drawn down to the bottom of the drop tube, a vacuum is created within the well casing. Vapors are then pulled out of the well and out of surrounding soils. As water recharges in the well, it is drawn up and out of the drop tube maintaining both the water level, and the vacuum within the well casing.
EEC Mobile Unit If your site needs dual-phase extraction, EEC can come to you. Our fully equipped mobile trailer has everything we need to take care of your DPE needs.