Services
ENVIRONMENTAL REMEDIATION
DFI/CSCE 13th Annual Geotechnical Seminar: Earth Slope Engineering
September 17th, 2010
Dam Safety 2010
September 19th, 2010
The 10th International Workshop on Micropiles
September 22nd, 2010
In Situ Soil and Groundwater Treatment
In situ treatment methods include air sparging/soil vapor extraction, permeable reactive walls or chemical oxidation.
Air Sparging
Air sparging involves the injection of contaminant-free air into a subsurface saturated zone. This enables hydrocarbons to transfer from a dissolved state to vapor which is then vented through the unsaturated zone.
Soil Vapor Extraction
This technique, as the name implies, is the extraction of contaminants in vapor form from soils above the water table by applying a vacuum through a system of wells installed near the contamination source to pull vapors to the surface. SVE is appropriate for contaminants that tend to volatilize or evaporate more readily. Air sparging is often used in conjunction with soil vapor extraction to increase air flow in the unsaturated zone and thus improve the rate of removal of the contaminants.
Permeable Reactive Walls
Permeable reactive walls are passive systems that allow groundwater to flow through specified treatment media. Contaminants in the groundwater react with the medium and are degraded, precipitated or absorbed.
