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Contaminant Types

CVOC

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DNAPL

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Projects & Case Studies

 

Thermal Remediation of SVOCs,
PAHs and Coal Tar

TerraTherm’s proprietary In Situ Thermal Desorption (ISTD) technology has been used to complete numerous projects focused on the remediation of Semi-Volatile Organic Compounds (SVOCs) including Polychlorinated Biphenyls (PCBs) (see table below), Creosote, and Coal Tar. Project applications completed to date include PCB sites, Manufactured Gas Plant (MGP) sites, military sites, and former wood treatment facilities. Depending on the objectives, these sites can be addressed using a range of target temperatures, such as:

  • Low temperatures (<B.P. of water, i.e., <100°C) can effectively enhance the recovery of viscous types of free product, such as coal tar.
    Applicable technologies: ERH , SEE and ISTD
 
  • Moderate temperatures (e.g., at or slightly above the B.P. of water, 100°C) can remove VOCs such as BTEX and Naphthalene from coal tar by steam distillation, which irreversibly changes the physical state of the remaining higher-boiling point Polycylic Aromatic Hydrocarbons (PAHs) from a liquid to a solid. This process, known as In Situ Thermochemical Solidification of coal tar (GTI, 2002), is very effective at halting the migration of coal tar DNAPL without excavation.
    Applicable technologies: ISTD
  • Higher temperatures (e.g., 325°C) can be used to achieve destruction and extraction of SVOCs through vaporization, oxidation, and pyrolysis. Applicable SVOCs include PCBs, dioxins, PAHs, pesticides, and nitroaromatics. This approach has been proven to accomplish 95%-99% destruction of the SVOCs in situ, resulting in very low post-treatment concentrations in soil (e.g., for PCBs, <0.033 mg/kg; and for PAHs, <0.059 mg/kg of Benzo(a)pyrene toxic equivalents). Intermediate temperatures such as 200°C may be sufficient for treatment of lower-boiling SVOCs such as di- and tri-chlorobenzenes.
    Applicable technologies: ISTD

 

Summary: Completed ISTD Projects for PCB-Contaminated Soils

LOCATION
PCB Aroclor
INITIAL CONCENTRATION (ppm)
FINAL CONCENTRATION
S. Glens Falls, NY
1248/1254
5,000
< 0.8
Cape Girardeau, MO
1260
500
< 1
Vallejo, CA
1254/1260
2,200
< 0.033
Tanapag, Saipan
1254/1260
10,000
< 1
Ferndale, CA
1254
800
< 0.17


Select SVOC Case Studies:
Remediation of Coal Tar in a Manufactured Gas Plant (MGP) Gasholder: North Adams, Massachusetts
Remediation of Coal Tar
in a Manufactured Gas
Plant (MGP) Gasholder:
North Adams, Massachusetts
In Situ Thermal Remediation of Contaminants Within a Former Wood Treatment Area - Alhambra, CA
In Situ Thermal Remediation of
Contaminants Within a Former
Wood Treatment Area - Alhambra, CA

PCB Spill Area, Centerville Beach, Naval Facillity, Ferndale, CA
PCB Spill Area
Naval Facility,
Ferndale, CA
Saipan, NMI PCB Remediation
Tanapag Village Site
Saipan, North
Mariana Islands
Former Mare Island Naval Shipyard, Vallejo California, Demonstration Project Bay Area Defense Conversion Action Team (BADCAT)
Former Mare Island Naval Shipyard
Bay Area Defense Conversion Action
Team (BADCAT) Vallejo, CA
Demonstration Project at the Missouri Electric Works (MEW) Site
Demonstration Project at the
Missouri Electric Works (MEW) Site

Contact us if you would like to discuss thermal applicability at your site.

 

 

 
   
Phone + 1 978 730 1200

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