Byproduct formation during the reduction of TCE by zero-valence iron and palladized iron

Journal Article · Sun Jun 01 04:00:00 EDT 1997 · Ground Water Monitoring and Remediation

DOI:https://doi.org/10.1111/j.1745-6592.1997.tb01191.x· OSTI ID:479379

Liang, L; Korte, N; Goodlaxson, J D; Clausen, J; Fernando, Q; Muftikian, R

The use of zero-valence metals for reduction of chlorinated solvents such as trichloroethene (TCE) has been an area of significant recent research. The proposed method has great attraction because the reactive media, iron filings, are relatively inexpensive. Moreover, remedial systems can be designed that rely on a passive funnel and gate approach that would minimize the cost of operation and maintenance. Trichloroethene (TCE) was reduced with zero-valence iron and palladized iron in zero-head-space extractors. Progress of the reaction in these batch studies was monitored with purge-and-trap gas chromatography and a flame ionization detector. When a 5 ppm initial concentration of TCE react with zero-valence iron, approximately 140 ppb of vinyl chloride persists for as long as 73 days. The concentration of vinyl chloride remaining with palladized iron is approximately an order of magnitude less than when zero-valence iron is the reductant. These data suggest that volatile byproducts may be under-represented in other published data regarding reduction with zero-valence metals. These results also demonstrate that the reduction of TCE with palladized iron is more than an order of magnitude faster than with zero-valence iron. With a 5:1 solution-to-solid ratio the TCE half-life with zero-valence iron is 7.41 hours, but is only 0.59 hours with the palladized iron.

• Sponsoring Organization: USDOE
• OSTI ID: 479379
• Journal Information: Ground Water Monitoring and Remediation, Journal Name: Ground Water Monitoring and Remediation Journal Issue: 1 Vol. 17; ISSN 1069-3629; ISSN GWMREV
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
CHEMICAL REACTIONS
CHLORINATED ALIPHATIC HYDROCARBONS
IRON
MONITORING
REMEDIAL ACTION