Thermally Activated Persulfate Oxidation of Trichloroethylene (TCE) and 1,1,1-Trichloroethane (TCA) in Aqueous Systems and Soil Slurries
| Autor: | Clifford J. Bruell, Kenneth L. Sperry, Chenju Liang, Michael C. Marley |
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| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | Soil and Sediment Contamination: An International Journal. 12:207-228 |
| ISSN: | 1549-7887 1532-0383 |
| DOI: | 10.1080/713610970 |
| Popis: | Under thermally activated conditions (i.e., temperature of 40∼99°C), there is considerable evidence that the persulfate anion ( $S_{2}O_{8}^{2-} ) can be converted to a powerful oxidant known as the sulfate free radical ( $SO_{4}^{-}\bullet ), which could be used in situ to destroy groundwater contaminants. In this laboratory study only limited trichloroethylene (TCE) degradation and no 1,1,1-trichloroethane (TCA) degradation was observed at 20°C. However, TCE and TCA were readily oxidized at 40°, 50°, and 60°C as a result of thermally activated persulfate oxidation. Experiments revealed that the pseudo-first-order reaction rate constants describing contaminant degradation increased with temperature. In aqueous systems activation energies for the TCE and TCA oxidation at an oxidant/contaminant molar ratio of 10/1 were determined to be 97.74±3.04 KJ/mole and 163.86±1.38 KJ/mole at pH 6 and an ionic strength of 0.1, respectively. A significant degradation of TCE and TCA occurs at 40° and 50°C, respectively,... |
| Databáze: | OpenAIRE |
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