Documents disponibles écrits par cet auteur

Evaluation of the effect of the rotational electrode speed in an electrochemical reactor using computational fluid dynamics (CFD) analysis / Helvio R. Mollinedo-Ponce-de-León in Industrial & engineering chemistry research, Vol. 51 N° 17 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 17 (Mai 2012) . - pp. 5947–5952 Titre : Evaluation of the effect of the rotational electrode speed in an electrochemical reactor using computational fluid dynamics (CFD) analysis Type de document : texte imprimé Auteurs : Helvio R. Mollinedo-Ponce-de-León, Auteur ; Sergio A. Martinez-Delgadillo, Auteur ; Víctor X. Mendoza-Escamilla, Auteur Année de publication : 2012 Article en page(s) : pp. 5947–5952 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Electrode  Fluid  dynamics Résumé : High concentrations of hexavalent chromium (Cr(VI)), which is a hazardous substance, can be found in the wastewaters generated by the electroplating industry. High-cost treatments have been applied to remove Cr(VI) from industrial wastewaters. Simple treatments such as chemical precipitation methods use great quantities of chemical and flocculating agents that produce large quantities of sludge, which, in turn, must be treated, handled, and disposed, thus increasing the process costs. The electrochemical process is an alternative method to remove Cr(VI) from industrial wastewaters. During the process, a film of oxides is formed on the surface of the electrodes (passivation effect), reducing both the Fe(II) transfer to the bulk liquid and the process efficiency, while increasing the energy consumption. In this work, rotating electrodes were used to increase the mass transfer of Fe(II) to the bulk liquid and avoid the salt film formation on the electrodes. Using industrial wastewater, different electrode rotating rates were tested and their effect on the treatment time was measured. The turbulence intensity was evaluated by computational fluid dynamics (CFD) analysis. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201782m [article] Evaluation of the effect of the rotational electrode speed in an electrochemical reactor using computational fluid dynamics (CFD) analysis [texte imprimé] / Helvio R. Mollinedo-Ponce-de-León, Auteur ; Sergio A. Martinez-Delgadillo, Auteur ; Víctor X. Mendoza-Escamilla, Auteur . - 2012 . - pp. 5947–5952. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 17 (Mai 2012) . - pp. 5947–5952 Mots-clés : Electrode  Fluid  dynamics Résumé : High concentrations of hexavalent chromium (Cr(VI)), which is a hazardous substance, can be found in the wastewaters generated by the electroplating industry. High-cost treatments have been applied to remove Cr(VI) from industrial wastewaters. Simple treatments such as chemical precipitation methods use great quantities of chemical and flocculating agents that produce large quantities of sludge, which, in turn, must be treated, handled, and disposed, thus increasing the process costs. The electrochemical process is an alternative method to remove Cr(VI) from industrial wastewaters. During the process, a film of oxides is formed on the surface of the electrodes (passivation effect), reducing both the Fe(II) transfer to the bulk liquid and the process efficiency, while increasing the energy consumption. In this work, rotating electrodes were used to increase the mass transfer of Fe(II) to the bulk liquid and avoid the salt film formation on the electrodes. Using industrial wastewater, different electrode rotating rates were tested and their effect on the treatment time was measured. The turbulence intensity was evaluated by computational fluid dynamics (CFD) analysis. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201782m

Simultaneous oxygen and carbon variation within an RBC biofilm as function of different operating conditions / Sergio A. Martinez-Delgadillo 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. 1270–1276 Titre : Simultaneous oxygen and carbon variation within an RBC biofilm as function of different operating conditions Type de document : texte imprimé Auteurs : Sergio A. Martinez-Delgadillo, Auteur ; Denis Cantú-Lozano, Auteur ; Carlos Montalvo, Auteur Année de publication : 2009 Article en page(s) : p. 1270–1276 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Biological  contactors  Biofilm  Oxygen  Carbon Résumé : In this work, a model that considers the change in biofilm density at different biofilm depths was applied. Two correlations, describing the variations of the oxygen and substrate effective diffusivities as functions of the biofilm density and depth, were introduced. The model was validated with experimental data of oxygen concentrations measured with a microelectrode at different biofilm depths in a laboratory-scale rotating biological contactor (RBC) system at different rotational speeds (1.25, 2.75, and 5.25 rpm.), using municipal wastewater. The oxygen and substrate concentration profiles depend on the position on the biodisk. Comparisons between the COD and oxygen concentration profiles obtained with the model and those obtained considering the microorganism density and diffusivities to be constant were performed. The effects of the biokinetic parameters μmax, KS, and KO2 on the COD and oxygen concentration profiles inside the biofilm were tested. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8005885 [article] Simultaneous oxygen and carbon variation within an RBC biofilm as function of different operating conditions [texte imprimé] / Sergio A. Martinez-Delgadillo, Auteur ; Denis Cantú-Lozano, Auteur ; Carlos Montalvo, Auteur . - 2009 . - p. 1270–1276. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1270–1276 Mots-clés : Biological  contactors  Biofilm  Oxygen  Carbon Résumé : In this work, a model that considers the change in biofilm density at different biofilm depths was applied. Two correlations, describing the variations of the oxygen and substrate effective diffusivities as functions of the biofilm density and depth, were introduced. The model was validated with experimental data of oxygen concentrations measured with a microelectrode at different biofilm depths in a laboratory-scale rotating biological contactor (RBC) system at different rotational speeds (1.25, 2.75, and 5.25 rpm.), using municipal wastewater. The oxygen and substrate concentration profiles depend on the position on the biodisk. Comparisons between the COD and oxygen concentration profiles obtained with the model and those obtained considering the microorganism density and diffusivities to be constant were performed. The effects of the biokinetic parameters μmax, KS, and KO2 on the COD and oxygen concentration profiles inside the biofilm were tested. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8005885