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Detoxification kinetic modeling for nonbiodegradable wastewaters / A. Santos ; P. Yustos ; S. Rodríguez ; F. Vicente in Industrial & engineering chemistry research, Vol. 47 n°22 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8639–8644 Titre : Detoxification kinetic modeling for nonbiodegradable wastewaters : an ecotoxicity lumping approach Type de document : texte imprimé Auteurs : A. Santos, Auteur ; P. Yustos, Auteur ; S. Rodríguez, Auteur ; F. Vicente, Auteur Année de publication : 2008 Article en page(s) : p. 8639–8644 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Detoxification  Nonbiodegradable  Ecotoxicity Résumé : A lumped pseudokinetic model that is able to predict the toxicity change during the treatment of industrial wastewater as a function of the initial toxicity and temperature of the process is proposed. The original pollutant (or pollutant mixture), P, reacts to form a lumped intermediate species, I, which, in turn, reacts to form a nontoxic lumped species D. Therefore, only P and I in this serial scheme, P → I → D, are considered to contribute to the toxicity of the aqueous sample. The median effective nominal concentration of species I, EC50(I), is a fitting parameter in this lumping approach and gives an idea of the toxicity of the first organic intermediates generated, lumped as I. The model was successfully validated by analyzing the toxicity data obtained during the catalytic wet oxidation of phenolic solutions (with phenol, o-cresol, and p-cresol employed as pollutants) in a three-phase fixed-bed reactor. Moreover, the lumped kinetic model developed in a previous work for the mineralization of phenol was also validated by analyzing the total organic carbon (TOC) evolution data obtained with o-cresol and p-cresol as pollutants. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8010758 [article] Detoxification kinetic modeling for nonbiodegradable wastewaters : an ecotoxicity lumping approach [texte imprimé] / A. Santos, Auteur ; P. Yustos, Auteur ; S. Rodríguez, Auteur ; F. Vicente, Auteur . - 2008 . - p. 8639–8644. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8639–8644 Mots-clés : Detoxification  Nonbiodegradable  Ecotoxicity Résumé : A lumped pseudokinetic model that is able to predict the toxicity change during the treatment of industrial wastewater as a function of the initial toxicity and temperature of the process is proposed. The original pollutant (or pollutant mixture), P, reacts to form a lumped intermediate species, I, which, in turn, reacts to form a nontoxic lumped species D. Therefore, only P and I in this serial scheme, P → I → D, are considered to contribute to the toxicity of the aqueous sample. The median effective nominal concentration of species I, EC50(I), is a fitting parameter in this lumping approach and gives an idea of the toxicity of the first organic intermediates generated, lumped as I. The model was successfully validated by analyzing the toxicity data obtained during the catalytic wet oxidation of phenolic solutions (with phenol, o-cresol, and p-cresol employed as pollutants) in a three-phase fixed-bed reactor. Moreover, the lumped kinetic model developed in a previous work for the mineralization of phenol was also validated by analyzing the total organic carbon (TOC) evolution data obtained with o-cresol and p-cresol as pollutants. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8010758

Kinetic modeling of toxicity evolution during phenol oxidation / A. Santos in Industrial & engineering chemistry research, Vol. 48 N° 6 (Mars 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 2844–2850 Titre : Kinetic modeling of toxicity evolution during phenol oxidation Type de document : texte imprimé Auteurs : A. Santos, Auteur ; P. Yustos, Auteur ; S. Rodríguez, Auteur Année de publication : 2009 Article en page(s) : pp. 2844–2850 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Phenol  oxidation  Electrochemical  treatment  Photocatalysis  Fenton’s  reagent  Catalytic  wet  oxidation Résumé : A previously proposed lumped pseudokinetic model has been improved and applied to analyze the literature toxicity evolution data for phenol oxidation using different abatement technologies, such as electrochemical (EC) treatment, photocatalysis (PC), Fenton’s reagent (FR), and catalytic wet oxidation (CWO). It has been considered that phenol, P, reacts to a lumped intermediate species I, and the latter reacts to a lumped species D. In this serial scheme, , all species can contribute to the toxicity of the aqueous sample. The literature toxicity data found for the oxidation of phenol were analyzed by this model considering first-order kinetics for both reactions in the serial scheme. The ratios of effective nominal concentrations, EC50(P)/EC50(I) and EC50(P)/EC50(D), were calculated from the fitting procedure. Values higher than unity were obtained in some cases, indicating that compounds more toxic than the parent pollutant are produced. Also, the pseudokinetic constants for the first and second reactions in the scheme were estimated. The lumping proposed adequately explains the literature data analyzed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801797q [article] Kinetic modeling of toxicity evolution during phenol oxidation [texte imprimé] / A. Santos, Auteur ; P. Yustos, Auteur ; S. Rodríguez, Auteur . - 2009 . - pp. 2844–2850. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 2844–2850 Mots-clés : Phenol  oxidation  Electrochemical  treatment  Photocatalysis  Fenton’s  reagent  Catalytic  wet  oxidation Résumé : A previously proposed lumped pseudokinetic model has been improved and applied to analyze the literature toxicity evolution data for phenol oxidation using different abatement technologies, such as electrochemical (EC) treatment, photocatalysis (PC), Fenton’s reagent (FR), and catalytic wet oxidation (CWO). It has been considered that phenol, P, reacts to a lumped intermediate species I, and the latter reacts to a lumped species D. In this serial scheme, , all species can contribute to the toxicity of the aqueous sample. The literature toxicity data found for the oxidation of phenol were analyzed by this model considering first-order kinetics for both reactions in the serial scheme. The ratios of effective nominal concentrations, EC50(P)/EC50(I) and EC50(P)/EC50(D), were calculated from the fitting procedure. Values higher than unity were obtained in some cases, indicating that compounds more toxic than the parent pollutant are produced. Also, the pseudokinetic constants for the first and second reactions in the scheme were estimated. The lumping proposed adequately explains the literature data analyzed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801797q