Demonstration of combined zero-valent iron and electrical resistance heating for in situ trichloroethene remediation.
Environ Sci Technol
; 45(12): 5346-51, 2011 Jun 15.
Article
en En
| MEDLINE
| ID: mdl-21591672
ABSTRACT
The effectiveness of in situ treatment using zero-valent iron (ZVI) for nonaqueous phase or significant sediment-associated contaminant mass can be limited by relatively low rates of mass transfer to bring contaminants in contact with the reactive media. For a field test in a trichloroethene (TCE) source area, combining moderate-temperature subsurface electrical resistance heating with in situ ZVI treatment was shown to accelerate TCE treatment by a factor of about 4 based on organic daughter products and a factor about 8 based on chloride concentrations. A mass-discharge-based analysis was used to evaluate reaction, dissolution, and volatilization processes at ambient groundwater temperature (~10 °C) and as temperature was increased up to about 50 °C. Increased reaction and contaminant dissolution were observed with increased temperature, but vapor- or aqueous-phase migration of TCE out of the treatment zone was minimal during the test because reactions maintained low aqueous-phase TCE concentrations.
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Tricloroetileno
/
Restauración y Remediación Ambiental
/
Calefacción
/
Hierro
Idioma:
En
Revista:
Environ Sci Technol
Año:
2011
Tipo del documento:
Article