Showing papers by "F. Javier Benitez published in 2001"
TL;DR: In this article, the photodecomposition of chloro-phenolic derivative pollutants was investigated using a single photodegromposition produced by polychromatic UV irradiation and a photo-Fenton system.
Abstract: The oxidation of some chlorophenols: 4-chlorophenol, 2,4-dichlorophenol, 2,4,6-trichlorophenol, 2,3,4,6-tetrachlorophenol, tetrachlorocatechol (3,4,5,6-tetrachloro-2-hydroxy phenol) and 4-chloroguaiacol (4-chloro-2-methoxy phenol) has been studied via single photodecomposition produced by polychromatic UV irradiation, oxidation by hydroxyl radicals generated by Fenton's reagent (hydrogen peroxide plus ferrous ions), and degradation by hydroxyl radicals produced by combinations of UV irradiation plus hydrogen peroxide, and UV irradiation plus hydrogen peroxide and ferrous ions (photo-Fenton system). These organics have been selected as models of chloro-phenolic derivative pollutants present in wastewaters and groundwaters. The degradation levels obtained in each process are reported. The quantum yields in the single photodecomposition reaction and the rate constants between the chlorophenols and the hydroxyl radicals in the reaction with Fenton's reagent are determined. Finally, the additional contributions to the photodecomposition promoted by the radical reaction in the combined UV/H2O2 and photo-Fenton systems are also evaluated.
© 2001 Society of Chemical Industry
85 citations
TL;DR: In this paper, a kinetic study was conducted using the Monod model, and rate constants were obtained in the range 0.061-0.015 min−1 achieved, indicating that some inhibition effects by substances present take place, and the application of the Levesnpiel model for that inhibitory effect leads to the determination of the rate constant, inhibitory parameter and critical substrate concentration of inhibition.
60 citations
TL;DR: In this paper, the decomposition of the organic substrate present in wastewaters from the washing stages in the black table olives industry is studied in batch reactors by means of several treatments: (1) ozonation processes, with ozone alone, and in combination with hydrogen peroxide and UV radiation; (2) aerobic biodegradation; and (3) ozoning of the aerobically pretreated wastewater.
Abstract: The decomposition of the organic substrate present in wastewaters from the washing stages in the black table olives industry is studied in batch reactors by means of several treatments: by ozonation processes, with ozone alone, and in combination with hydrogen peroxide and UV radiation; by aerobic biodegradation; and by the ozonation of the aerobically pretreated wastewaters. In the ozonation processes, the effect of the inlet ozone partial pressure on the substrate removal, biodegradability, and aromatic compounds content as well as the influence of the presence of H2O2 and UV radiation on the substrate removal is established. A kinetic study is conducted which leads to the evaluation of the kinetic constants for the substrate reduction and ozone disappearance. In the aerobic degradation treatment, the evolutions of the substrate and biomass are followed during the process, and a kinetic study is performed by using the Contois model, which applied to the experimental data provides the specific biokineti...
43 citations