Advanced bioreduction of commercially important azo dyes / Gergo Mezohegyi in Industrial & engineering chemistry research, Vol. 48 N° 15 (Août 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7054–7059 Titre : Advanced bioreduction of commercially important azo dyes : modeling and correlation with electrochemical characteristics Type de document : texte imprimé Auteurs : Gergo Mezohegyi, Auteur ; Azael Fabregat, Auteur ; Josep Font, Auteur Année de publication : 2009 Article en page(s) : pp. 7054–7059 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Anaerobic biodegradability Upflow stirred packed-bed reactors Biological activated carbon Résumé : The anaerobic biodegradability of some commercially important colorants was investigated in upflow stirred packed-bed reactors (USPBR) containing biological activated carbon (BAC) system. Decolorization with very high reduction rates took place in the case of azo dyes. At least 80% of conversion was achieved for these dyes at a space time (τ) of 2.0 min or higher corresponding to a residence time of about 1.8 min at the most. On the contrary, nonazo xanthene dye was not converted in the anaerobic bioreactor system. A simple model was proposed to predict azo dye decolorization involving both heterogeneous catalysis and biological degradation. Adsorption studies for the dyes revealed that their adsorption affinity to activated carbon is not the key factor in the reduction process. Results from voltammetric experiments show that a correlation exists between electrochemical characteristic and anaerobic biodegradability of different azo dyes in the continuous USPBR-BAC catalytic system. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9003893 [article] Advanced bioreduction of commercially important azo dyes : modeling and correlation with electrochemical characteristics [texte imprimé] / Gergo Mezohegyi, Auteur ; Azael Fabregat, Auteur ; Josep Font, Auteur . - 2009 . - pp. 7054–7059. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7054–7059 Mots-clés : Anaerobic biodegradability Upflow stirred packed-bed reactors Biological activated carbon Résumé : The anaerobic biodegradability of some commercially important colorants was investigated in upflow stirred packed-bed reactors (USPBR) containing biological activated carbon (BAC) system. Decolorization with very high reduction rates took place in the case of azo dyes. At least 80% of conversion was achieved for these dyes at a space time (τ) of 2.0 min or higher corresponding to a residence time of about 1.8 min at the most. On the contrary, nonazo xanthene dye was not converted in the anaerobic bioreactor system. A simple model was proposed to predict azo dye decolorization involving both heterogeneous catalysis and biological degradation. Adsorption studies for the dyes revealed that their adsorption affinity to activated carbon is not the key factor in the reduction process. Results from voltammetric experiments show that a correlation exists between electrochemical characteristic and anaerobic biodegradability of different azo dyes in the continuous USPBR-BAC catalytic system. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9003893

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