Remediation professionals often select TCH for the treatment of VOCs, SVOCs, PCBs and PFAS. TCH involves heating wells to many hundreds of degrees Celsius. The heat propagates radially away from the heater wells at a rate usually less than an inch a day. Within the heating front, there is enormous (often more than 99%) contaminant mass removal, while beyond the front, there is minimal remediation. The tighter the heater well spacing, the faster a site will clean up. Typically, TRS spaces heater wells between 6 to 12 feet apart.
As the maximum temperature of water is its boiling temperature, TCH will desiccate the matrix where temperatures exceed the boiling point of water. Thus, soil moisture content has a profound impact of TCH energy requirements. While the boiling point of the contaminant and the percent mass removal will affect the remediation energy requirements, the more important design considerations are recharge, heater well density and time to meet the remediation goals.
TRS will recommend the most cost-efficient ISTR technology based on the project scope and contaminants of concern. While ERH is an appropriate solution for VOC remediation, we can apply TCH for VOCs, SVOCs, PCBs and PFAS remediation. TRS HybridHeater systems include ERH and TCH in a single borehole, allowing TRS to deliver energy where it is most needed, affording a cost-effective remediation solution.
When applying a single ISTR technology, it is sometimes difficult to achieve an optimal temperature in a permeable unit with fast-moving groundwater. Applying the TRS HybridHeater technology, TRS can direct more energy to that zone.
Suppose you have VOCs in overburden and fractured crystalline bedrock, such as granite. As the granite has extremely low primary porosity, virtually all the contamination will be in the fractures. Although ERH can target the contamination in the overburden and fractures, the granite will remain cool. A simple solution is to heat the overburden with ERH and the rock with the TCH element, which can reduce costs dramatically.
TRS FlexHeater® remediation services use a patented heater element to deliver energy into the formation. The remediation is better, faster and less expensive than currently available TCH systems. Imagine putting a Slinky into a small diameter pipe. The Slinky is a single wire, which we can heat up to about 800° Celsius. Although the wire is a single temperature, the Slinky-like design allows us to vary coil density throughout the entire length of the pipe. The greater the coil density, the greater the energy input to the formation.
Suppose you had a layer of PCBs at four feet below ground surface (bgs) and coal tar at the top of bedrock at 30 feet bgs. TRS could install the heater element so that we deliver more energy at the four and 30-foot horizons than at other depths. Once we clean those strata, TRS can easily pull out the heater element, quickly reconfigure it and put it back into the well.
Because of our ability to adjust the temperature profile of the system during scheduled breaks in operations, TRS will complete projects faster. TRS FlexHeater wells require essentially zero maintenance - only periodic amp checks to verify that they are functioning.
Another advantage of the service is how extremely easy it is to handle and ship the components. Our employee-owners can adjust the vertical temperature profile of the heater well upon installation of the element. As it will fit inside a small diameter casing, installation costs are the lowest in the industry.
TRS Thermal Conduction Heating (TCH)
TRS HybridHeater® Remediation Services
TRS FlexHeater® Remediation Services