Innovations in Heat-Enhanced Processes

TRS is combining remedies to provide both source zone and total plume solutions at reduced costs vs. traditional in situ thermal remediation.

HEPA® Remediation Process for heat enhanced plume attenuation: TRS is implementing low-temperature ERH at sites to accelerate Enhanced Anaerobic Bioremediation (EAB). This solution enhances dissolution of DNAPL, while increasing biodegradation kinetic rates, and enhancing abiotic degration rates reducing cleanup time frames as both a source zone and/or total plume remedy.


  • Increases dissolved organic carbon.
  • Increases reaction kinetics.
  • Increases mass dissolution.
  • Decreases mass flux.
  • Eliminates vapor capture and treatment.
  • Reduces overall remedy cost.
  • Reduces bioremediation time by a factor of four.

Multi-phase Extraction: Electrical Resistance Heating (ERH) combined with multi-phase extraction (MPE) is also used to recover total petroleum hydrocarbons (TPH) including long chain compounds as heavy as coal tar (or solid grease) at non-aqueous phase liquid concentrations to significantly reduce the viscosity and density of the TPH for recovery to the surface where it is treated or disposed.


  • Semi-volatiles including light non-aqueous phase liquids (LNAPLs) are rapidly recovered, recycled.
  • Coal tar converts from dense non-aqueous phase liquid (DNAPL) to LNAPL.
  • Recovery of petroleum, oil, and lubricants (POLs) from low hydraulic conductivity soil and high transmissive aquifers is made possible.
  • Multiple order of magnitude reductions in contaminant concentrations (i.e. >99%) can be achieved.
  • Can be applied under areas open to the public including residential, commercial, and industrial properties such as operating facilities, roads, parking lots, and sidewalks.
  • Can be applied safely and effectively in the presence of operating, buried, and above ground utilities.
  • Eliminates the vapor intrusion pathway.

Chemical Oxidation: Heat-activation of oxidants is a viable solution for semi-volatiles in the aqueous phase that have high disposal costs. As an example, TRS ERH has been used in combination with sodium persulfate to treat pentachlorophenol in groundwater at a former wood treatment production facility.


  • Heat assists the radius of influence of oxidants.
  • Low temperature ERH saves money by eliminating ¾ of traditional ERH equipment.
  • The injection system installed during drilling saves time and money.
  • Expands use of oxidation to sites with access limitations or low permeability soils.
  • Selective treatment of contaminated areas or for source control is possible.
  • Reduces the need for multiple oxidant injections.
  • Speeds remediation.
  • No rebound.
  • TRS is able to guarantee results.

Heat-Enhanced Bioremediation, Tacoma, WA
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Multi-phase Extraction, Santa Rosa, CA
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Chemical Oxidation, Seattle, WA
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