Thermal Remediation Technologies

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  HETR™ is ERG’s patented hybrid-energy thermal conduction heating system, designed to deliver high-temperature remediation with substantially improved efficiency, sustainability, and control. The system applies multiform energy—combining convective, conductive, and radiative heat transfer—to achieve stable heater–formation interface temperatures exceeding 500 °C and sustainable heat fluxes of ~400–550 W per linear foot, enabling subsurface targets from 35 °C to over 400 °C at well spacings of 8–17 ft. Each HETR™ well also generates 100–500 W of renewable energy 24/7 through integrated thermoelectric modules, which can be supplemented with auxiliary solar to further offset power demand. The platform accommodates variable reliance on combustion or electric heating, grid-connected or off-grid operation, and precise longitudinal or lateral heat distribution. Together, these capabilities reduce carbon footprint, increase energy utilization efficiency, and overcome infrastructure limitations that constrain traditional ISTR systems. 

ThermaCycle™ is ERG’s next‑generation low to mid temperature ISTR platform—a turnkey, closed‑loop groundwater recirculation system that supercharges subsurface clean‑ups. Housed in a rugged 8.5 × 12 ft all‑metal enclosure with crane‑lift rigging, each skid ships fully piped, wired, and factory‑tested. Allen‑Bradley PLCs running on an Ignition® SCADA backbone deliver real‑time telemetry, remote control, and automated alarms, while magnetic flow meters, pressure/temperature transducers, and onboard data logging ensure precision you can trust. 

Built for versatility, ThermaCycle™ can lift groundwater temperatures by up to 170 °F for aggressive DNAPL mobilization or dial back to a 30–40 °F boost for heat‑enhanced bioremediation (HEBR). The platform scales effortlessly—from 5–20 gpm at high‑delta (105 F temperature delta) operations for hydrolysis or free‑product recovery, to 40 gpm at lower deltas for large‑footprint bioremediation campaigns targeting heat enhanced biodegradation. Inline dosing ports accommodate surfactants, co‑solvents, electron donors, and nutrients, enabling seamless transitions between chemical, thermal, and bio‑driven strategies. Fully automated, rapidly deployable, and engineered for maximum uptime, ThermaCycle™ delivers faster clean‑ups, lower risk, and measurable results across the full spectrum of in‑situ thermal remediation.

  ERH uses electrodes, placed in 3-phase or 6-phase arrays, to force a controlled current through the subsurface, propagating from electrode to electrode. Soil between electrodes resists that current flow and electrical energy is transformed into heat energy, causing the soil matrix to heat. ERH is an effective option for low to moderate temperature applications up to ~100 degrees C. ERH can be applied with a great degree of control especially for low temp applications as it does not generate “hot spots” around each electrode well as is the case for TCH based technologies. As such, ERH can be a very important technology for low temp applications, such as heat enhanced bioremediation, as a few degrees can determine whether degradation reactions fully proceed. 

SEE involves the injection of steam at variable pressures and flow rates through screened injection wells placed throughout a treatment volume. This is coupled with MPE and/or groundwater extraction wells to ensure hydraulic control and to mitigate any off-site migration of contaminants. This technology is Ideal for remediation of VOCs and free product in highly transmissive intervals that feature high permeability lithology and groundwater flow rates that would otherwise render ERH or TCH impossible. However, SEE is limited to 100 degree C applications, and the Site conditions that permit SEE to be effectively implemented are specific and highly restrictive.