[Wet oxidization of phenol waters by molecular oxygen activated by the H2O2/Fe2 plus pair: optimisation of operation parameters by Simplex design and kinetic study]
1995
Foussard, J.N. | Chakchouk, M. | Debellefontaine, H. (Institut National des Sciences Appliquees, Toulouse (France). Lab. d'Ingenierie des Procedes de l'Environnement)
Aqueous solutions containing phenol were treated in a batch reactor using molecular oxygen according to the wet air oxidation technique, under high temperature and pressure. These temperature and pressure constraints could be sharply reduced by feeding continuously small quantities of hydrogen peroxide within the reactor. The system H2O2/Fe2 plus was found to be an efficient promoter for radicle reactions. The optimum operating conditions were assessed by using a Simplex design. Injecting 10-12 percent of the stoichiometric amount in hydrogen peroxide allowed a 90 percent COD reduction and a 82 percent TOC reduction at 180 degree Celsius. A kinetic model was developed and validated by the experimental results, specially for a 0th order with respect to phenol during the major part of the reaction. At the end of the runs, this order changes, thus indicating an autocatalytic effect of phenol.
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