Scopul nostru este sprijinirea şi promovarea cercetării ştiinţifice şi facilitarea comunicării între cercetătorii români din întreaga lume.
Autori: A. Kettrup, Mariana Neamtu, A. Yediler, I. Siminiceanu
Editorial: A. Macias Machin, J. Umbria, Universidad de Las Palmas de Gran Canaria, Chemical Industry and Environment IV, 1, p.31-36, 2003.
Two photochemical processes (H2O2/UV and photo- Fenton) have been experimentally investigated, in comparison with ozonation, for the degradation of the Disperse Red 354 azo dye in water. The effectiveness has been evaluated through three conversions: decolorization degree (X1), COD reduction (X2), and TOC reduction (X3). The decolorization degree at a given time in the three processes decreased in the order : photo- Fenton > ozonation > UV / H2O2. At a 60 minutes reaction time, for instance, the decolorization degree was 98.6% (photo- Fenton), 74.7 % (ozonation), and 48.0 % (UV/ H2 O2). The apparent first order rate constant, identified on the basis of experimental data obtained, was 13.266 times greater in the photo-Fenton process than in the O3 process, while in the UV/ H2O2 was 5% smaller.The influence of the Lyocol dispersing agent on the dye photodegradation has been studied. Some mechanistic considerations are made in order to explain the different performances of the three processes.
Cuvinte cheie: textile wastewater, photo-Fenton, UV/H2O2, ozonation