Benefits of ISTD

Also Applicable Below the Water Table

ISTD technology is also applicable to the contaminants within soils below the water table as long as the soils can be heated up to designated target treatment temperatures.

Contaminants such as TCE, PCE, and other VOCs that do not require treatment temperatures higher than the boiling point of water (100ºC, or 212ºF), can be treated simply by steam distillation. Contaminants such as PAHs, dioxins, PCBs, and other SVOCs that require treatment temperatures higher than the boiling point of water, are treated first by boiling off the water within the treatment zone, and then by heating up the soil to the designated treatment temperatures. If the zone being treated sees an excessive amount of groundwater recharge, it could prevent the attainment of treatment temperatures. A hydraulic barrier may need to be installed to control recharge into such a treatment zone.