The most robust way to remediate a site in situ is to use thermal remediation. For in situ thermal remediation we use Electrical Resistance Heating (ERH). This technology is performed by our Joint Venture company, HMVTRS, in which we work together with TRS Group, Inc. TRS is a U.S. based company specializing in ERH remediation.
ERH uses electricity to heat the soil to such a level that a broad range of volatile organic contaminants are vaporized. The vapors are collected by a soil vapor or multi phase extraction system and treated above ground level. In contrast to many other in situ remediation technologies the soil gets completely treated everywhere; regardless if it is sand or a clay/loam layer. This means that the technology effectively targets trapped pollution like free phase chlorinated hydrocarbons (DNAPL).
This site gives you a global overview of ERH. For more partner & technology information, also refer to the TRS Group website: www.thermalrs.com.
Electrical Resistance Heating (ERH) can be applied in soil and groundwater remediation. The idea is simple. Electrodes are placed in the soil. Electricity is then passed through electrodes until the soil is heated up to a maximum temperature of the boiling point of water. This heat turns the groundwater into steam to evaporate the contaminants. The vapors and steam are then extracted, resulting in almost completely clean soil.
The process is extremely robust: all of the soil is heated and therefore all contaminants are evaporated. ERH is much less sensitive to the heterogeneous nature of the soil: even layers of loam/clay are heated up. This differs from other in situ remediation processes which merely remove easily accessible contaminants and are less efficient – especially in cases of pure product with volatile (chlorinated) hydrocarbons. ERH provides a solution for lingering contaminants which could never have been remediated in the past.
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