Oxidation of cosmetic wastewaters with H2O2 using a Fe/gamma-Al2O3 catalyst

A catalyst based on Fe supported on gamma-Al2O3 has been prepared and tested for catalytic wet peroxide oxidation (CWPO) of cosmetic wastewaters. The influence of the main operating conditions ( space-time, temperature, and H2O2 dose) have been investigated. Working with this self-made Fe/gamma-Al2O3 catalyst at 85 degrees C, with a space-time of 9.4 kg(cat) h/kg(COD) and a dose of H2O2, corresponding to 0.5 times the theoretical stoichiometric H2O2/COD ratio, a substantial COD reduction ( around 80%) has been reached with a complete consumption of H2O2. The locally allowable limit of COD for industrial wastewaters discharge to the municipal sewer system can be achieved at lower temperature and space-time. The catalyst showed a high stability in 100 h time on stream tests, where COD and TOC reductions around 82 and 60%, respectively, were maintained working at 85 degrees C and 9.4 kg(cat) h/kg(COD) space-time. Fe leaching from the catalyst upon that time on stream was lower than 3% of the initial load.