Issue |
Analusis
Volume 26, Number 7, September 1998
Preparative Chromatography
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Page(s) | 237 - 244 | |
Section | Original articles | |
DOI | https://doi.org/10.1051/analusis:1998167 |
DOI: 10.1051/analusis:1998167
Hydrothermal oxidation of organochlorines
S. Bachir1, M. Ambrosio1, V. Federici2 and H. Barnier21 Université de Provence, 3 place Victor Hugo, Case 29, 13331 Marseille, France
2 CEA - SEP/LPTE Cadarache, 13108 St-Paul-Lez-Durance, France
Abstract
The hydrothermal oxidation of four organochlorines (perchloroethylene, 1,1,1 trichloroethane, trichloroethylene and dichloromethane) was studied. This study aims at determining the influence of
various parameters and the optimal conditions for obtaining the best oxidation yield in the degradation process. The factors studied were reaction temperature, initial substrate concentration,
reaction time, agitation speed and volume of the solution in the reactor vessel. The tests were conducted following the methodology of experimental design. The results obtained show that these
compounds are degraded rather easily in the working conditions. The degradation efficiency can reach 98% of the total organic carbon and 99.9% of the initial substrate concentration. The
temperature and the initial substrate concentration are the most influential factors on the oxidation process. The reaction time and the volume of the solution have a less interesting influence on
the degradation yield in the experimental areas. Formic acid and methanol are the byproducts found in the final effluents. Their concentrations decrease considerably when the reaction
temperature is higher. The chlorine is found essentially in the Cl- form.
Key words: Organochlorines / water / oxidation / organic carbon / chlorine / optimization / experimental design.
© EDP Sciences, Wiley-VCH 1998