Reductive dechlorination of carbon tetrachloride in water using elemental iron
- Univ. of Iowa, Iowa City, IA (United States). Dept. of Civil and Environmental Engineering
The authors are investigating the abiotic reductive dechlorination of carbon tetrachloride using elemental iron as an electron donor. Reduction of mono-, di-, and trichloromethane is also thermodynamically favorable to a lesser degree. Their work has provided preliminary feasibility data for the development of novel and inexpensive remediation techniques for carbon tetrachloride in groundwater, including an in-situ process, which may be applicable to other halogenated priority pollutants. Batch experiments were conducted in aqueous solution to determine stoichiometric and pseudo first order reaction rate coefficients for the sequential reduction of carbon tetrachloride to chloroform, methylene chloride, chloromethane and methane using powdered iron metal as the sole reductant. Aerobic reduction rates were slower than anaerobic rates, presumably due to dissolved oxygen from the ambient atmosphere competing with carbon tetrachloride as the terminal electron acceptor. Reduction rates were accelerated at higher temperatures in agreement with the Ahrennius equation. Soil column experiments which simulated reductive dechlorination of carbon tetrachloride in subsurface environments were conducted under anaerobic conditions.
- OSTI ID:
- 491087
- Report Number(s):
- CONF-9406250--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dechlorination of chloroform by methanosarcina strains
Oxygen controlled product formation in CCl{sub 4} dechlorination using zero-valent iron