Innovations in Heat-Enhanced Processes

Using in situ thermal remediation technologies at sub-steaming temperatures, a process called HEPA® (heat enhanced plume attenuation) remediation, to accelerate naturally occurring processes, TRS can provide a total plume solution at costs substantially lower than applying ISTR at steaming temperatures.

Heat enhanced biodegradation: Elevating the temperature of the groundwater can dramatically increase the bioremediation solutions.: 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 degradation rates reducing cleanup time frames as both a source zone and/or total plume remedy.

Advantages include:

  • Increases biodegradation kinetics (about four or five times compared to ambient temperature conditions in cooler climates)
  • Dramatic increase in dissolved organic carbon (a.k.a. as electron donor or bug food)
  • Increases mass flux from the non-aqueous phase to the aqueous phase
  • Eliminates vapor capture and treatment
  • Reduces life-cycle costs

Heat enhanced multiphase extraction: TRS combines ISTR with multiphase extraction (MPE) to reduce the viscosity and density of long chain petroleum hydrocarbons, coal tar and creosote.

Advantages include:

  • Rapid recovery of SVOCs
  • Removal under public access areas, including residential, commercial and industrial properties
  • Safely applied around buried and above ground utilities
  • Eliminates vapor intrusion pathways

Heat activated chemical oxidation: Heat activating sodium persulfate creates the most reactive version of the reagent. Applying the technology in the Pacific Northwest, TRS helped treat pentachlorophenol in groundwater at a former wood treatment facility.

Heat enhanced hydrolysis: Hydrolysis is a water based reaction; that is, water is the reagent. As clay is quite porous (albeit not terribly permeable), TRS can remediate energetics in clay and rock without moving fluids. While reaction half-lives vary as a function of temperature and pH, TRS expects 99+% mass conversion in time frames that are quite attractive.

Compounds that hydrolyze include pesticides, halogenated alkanes and energetics, such as TNT, RDX and HMX. As shown below, the half-life of RDX hydrolysis at circumneutral pH at 90°C is about 10 days. Seven half-lives is 99% mass conversion; 10 half-lives is 99.9% conversion.

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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