Documents disponibles écrits par cet auteur

Fenton’s depuration of weathered olive mill wastewaters over a Fe − Ce − O solid catalyst / Rui C. Martins in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9043–9051 Titre : Fenton’s depuration of weathered olive mill wastewaters over a Fe − Ce − O solid catalyst Type de document : texte imprimé Auteurs : Rui C. Martins, Auteur ; Teresa Gomes, Auteur ; Rosa M. Quinta-Ferreira, Auteur Année de publication : 2010 Article en page(s) : pp. 9043–9051 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Treatment  wastewaters  Catalyst Résumé : The treatment of actual olive mill wastewaters, coming from an evaporation pond subjected to climatic conditions, was studied by the heterogeneous Fenton process with the laboratory catalyst Fe−Ce−O 70/30. Investigating the impact of the solid load, hydrogen peroxide concentration, and pH over the methodology efficiency a full factorial experimental design was followed by results stating that the amount of Fe−Ce−O 70/30 and pH had a high influence on final depuration, while [H2O2] was not statistically relevant. Reduced models based on those data showed some ability to predict chemical oxygen demand (COD) removal, final effluent biodegradability, and iron leached concentration. Also respirometric and luminescence techniques were used to evaluate toxicity. The recommend operational conditions gathered up when each one of the response factors was optimized were diverse. From those, it seemed appropriate to run with high Fe−Ce−O loads (1.5 g/L) allied with pH = 4 and [H2O2] = 115 mM since, even if COD degradation (24%) was not the highest one, the final effluent was very biodegradable (BOD5/COD = 0.54) allowing the application of an activated sludge post-treatment. Furthermore, for these conditions, catalyst stability was safeguarded since Fe elution was low (0.12 mg/L). Finally, the catalytic system involving Fenton’s peroxidation Fe−Ce−O 70/30 was revealed to be promising for real olive mill wastewaters biodegradability improvement and toxicity removal enabling a proper postbioremediation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101203p [article] Fenton’s depuration of weathered olive mill wastewaters over a Fe − Ce − O solid catalyst [texte imprimé] / Rui C. Martins, Auteur ; Teresa Gomes, Auteur ; Rosa M. Quinta-Ferreira, Auteur . - 2010 . - pp. 9043–9051. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9043–9051 Mots-clés : Treatment  wastewaters  Catalyst Résumé : The treatment of actual olive mill wastewaters, coming from an evaporation pond subjected to climatic conditions, was studied by the heterogeneous Fenton process with the laboratory catalyst Fe−Ce−O 70/30. Investigating the impact of the solid load, hydrogen peroxide concentration, and pH over the methodology efficiency a full factorial experimental design was followed by results stating that the amount of Fe−Ce−O 70/30 and pH had a high influence on final depuration, while [H2O2] was not statistically relevant. Reduced models based on those data showed some ability to predict chemical oxygen demand (COD) removal, final effluent biodegradability, and iron leached concentration. Also respirometric and luminescence techniques were used to evaluate toxicity. The recommend operational conditions gathered up when each one of the response factors was optimized were diverse. From those, it seemed appropriate to run with high Fe−Ce−O loads (1.5 g/L) allied with pH = 4 and [H2O2] = 115 mM since, even if COD degradation (24%) was not the highest one, the final effluent was very biodegradable (BOD5/COD = 0.54) allowing the application of an activated sludge post-treatment. Furthermore, for these conditions, catalyst stability was safeguarded since Fe elution was low (0.12 mg/L). Finally, the catalytic system involving Fenton’s peroxidation Fe−Ce−O 70/30 was revealed to be promising for real olive mill wastewaters biodegradability improvement and toxicity removal enabling a proper postbioremediation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101203p

Screening of ceria-based and commercial ceramic catalysts for catalytic ozonation of simulated olive mill wastewaters / Rui C. Martins in Industrial & engineering chemistry research, Vol. 48 N°3 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1196–1202 Titre : Screening of ceria-based and commercial ceramic catalysts for catalytic ozonation of simulated olive mill wastewaters Type de document : texte imprimé Auteurs : Rui C. Martins, Auteur ; Rosa M. Quinta-Ferreira, Auteur Année de publication : 2009 Article en page(s) : p. 1196–1202 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Water  Wastewater  Commercial  catalysts  Catalytic  Ozonation Résumé : The efficiency of several commercial and laboratory catalysts in the catalytic ozonation of a simulated phenolic wastewater was tested. Experiments involving three ceria-based catalysts prepared in our laboratory, namely, Co−Ce−O (70/30), Ag−Ce−O (70/30), and Mn−Ce−O (70/30), were compared with those involving commercially available catalysts, namely, G66A (CuO−ZnO/Al2O3), N-150 (Fe2O3−MnOx), SG2216 (CuO−MnOx/Al2O3), and N-140 (CuO−MnOx). Of these, Mn−Ce−O (70/30) was found to be an interesting alternative because 80% of the total organic carbon was removed after 120 min of oxidation. The biodegradability of the simulated wastewater was assessed by measuring the ratio BOD5/COD before and after each treatment. Single and catalytic ozonation over Ag−Ce−O led to a less biodegradable effluent, whereas the rest of the catalytic systems truly enhanced the biodegradability of the simulated wastewater. Trends in the concentrations of some intermediates and the pH profiles were also analyzed for single and catalytic ozonation over Mn−Ce−O (70/30). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8006209 [article] Screening of ceria-based and commercial ceramic catalysts for catalytic ozonation of simulated olive mill wastewaters [texte imprimé] / Rui C. Martins, Auteur ; Rosa M. Quinta-Ferreira, Auteur . - 2009 . - p. 1196–1202. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1196–1202 Mots-clés : Water  Wastewater  Commercial  catalysts  Catalytic  Ozonation Résumé : The efficiency of several commercial and laboratory catalysts in the catalytic ozonation of a simulated phenolic wastewater was tested. Experiments involving three ceria-based catalysts prepared in our laboratory, namely, Co−Ce−O (70/30), Ag−Ce−O (70/30), and Mn−Ce−O (70/30), were compared with those involving commercially available catalysts, namely, G66A (CuO−ZnO/Al2O3), N-150 (Fe2O3−MnOx), SG2216 (CuO−MnOx/Al2O3), and N-140 (CuO−MnOx). Of these, Mn−Ce−O (70/30) was found to be an interesting alternative because 80% of the total organic carbon was removed after 120 min of oxidation. The biodegradability of the simulated wastewater was assessed by measuring the ratio BOD5/COD before and after each treatment. Single and catalytic ozonation over Ag−Ce−O led to a less biodegradable effluent, whereas the rest of the catalytic systems truly enhanced the biodegradability of the simulated wastewater. Trends in the concentrations of some intermediates and the pH profiles were also analyzed for single and catalytic ozonation over Mn−Ce−O (70/30). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8006209