Phase-transfer catalysis applied to the oxidation of nonaqueous phase trichloroethylene by potassium permanganate
The use of potassium permanganate to oxidize chlorinated solvents has been demonstrated as an effective process for treating nonaqueous phase liquids in ground-water systems. This study evaluates the effectiveness of phase-transfer catalysts (PTCs) in enhancing the degradation rate. PTCs work by transferring permanganate ion into the nonaqueous phase where it initiates oxidative decomposition. We studied the oxidation of trichloroethylene (TCE) by potassium permanganate, conducting kinetic batch experiments in conjunction with three PTCs that varied in terms of their extraction constants and molecular structures. Using the same batch technique, we examined whether PTCs could enhance the aqueous solubility of TCE. Solubilization could also increase oxidation rates in the aqueous phase. Rates of TCE oxidation in solutions containing the PTCs and a blank were estimated separately by measuring chloride concentration and UV-Vis absorbance in the aqueous phase. The enhanced rate of TCE destruction by the PTCs was reflected by an increase in the rate of consumption of permanganate ion and production of chloride ion. There was no tendency for the PTCs, however, to solubilize TCE in the aqueous phase. Therefore, the PTCs increased the rate of TCE decomposition by catalyzing permanganate oxidation in the organic phase. This study suggests that there is significant potential for testing this scheme under field conditions.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director, Office of Science (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 839189
- Report Number(s):
- LBNL-50336; JCOHE6; R&D Project: 465103; TRN: US200509%%309
- Journal Information:
- Journal of Contaminant Hydrology, Vol. 44, Issue 2; Other Information: Journal Publication Date: July 2000; PBD: 2 Jan 1999; ISSN 0169-7722
- Country of Publication:
- United States
- Language:
- English
Similar Records
Permanganate Treatment of DNAPLs in Reactive Barriers and Source Zone Flooding Schemes
Permanganate treatment of DnAPLs in reactive barriers and source zone flooding schemes. 1998 annual progress report