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The influence of biofilm on the effectiveness of ion exchange process / Anna Gorka in Industrial & engineering chemistry research, Vol. 47 N°19 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7456–7464 Titre : The influence of biofilm on the effectiveness of ion exchange process Type de document : texte imprimé Auteurs : Anna Gorka, Auteur ; Dorota Papciak, Auteur ; Justyna Zamorska, Auteur Année de publication : 2008 Article en page(s) : p. 7456–7464 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Ammonia--ion  exchange  Zeolite  Biofilm  Fluidized  bed  reactor  Plug  flow  reactor Résumé : The ion exchange of ammonia in a synthetic zeolite has been investigated in the presence of Biofilm of nitrifying bacteria. The Biofilm has been cultivated on the zeolite carrier under different hydrodynamic conditions in a plug flow reactor and in a fluidized bed reactor. Samples of the carrier covered by Biofilm have been withdrawn from the reactors and packed into a miniature ion exchange column that has been used to analyze the ion exchange characteristics, i.e., to determine ion exchange equilibria and the mass transport kinetics. For this purpose, the breakthrough curves have been registered at different ammonia loadings and different concentrations of sodium bicarbonate in the solution. To analyze the mass transport mechanism and quantify kinetic coefficients, we have exploited a linear driving force model (i.e., the LDF model) and the generalized model. The ion exchange and mass transfer characteristics of the Biofilm-covered carrier have been compared to those of the virgin zeolite. The effect of Biofilm on the mass transfer kinetics and ion exchange capacity was found to be induced by swelling properties of zeolite. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8002057 [article] The influence of biofilm on the effectiveness of ion exchange process [texte imprimé] / Anna Gorka, Auteur ; Dorota Papciak, Auteur ; Justyna Zamorska, Auteur . - 2008 . - p. 7456–7464. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7456–7464 Mots-clés : Ammonia--ion  exchange  Zeolite  Biofilm  Fluidized  bed  reactor  Plug  flow  reactor Résumé : The ion exchange of ammonia in a synthetic zeolite has been investigated in the presence of Biofilm of nitrifying bacteria. The Biofilm has been cultivated on the zeolite carrier under different hydrodynamic conditions in a plug flow reactor and in a fluidized bed reactor. Samples of the carrier covered by Biofilm have been withdrawn from the reactors and packed into a miniature ion exchange column that has been used to analyze the ion exchange characteristics, i.e., to determine ion exchange equilibria and the mass transport kinetics. For this purpose, the breakthrough curves have been registered at different ammonia loadings and different concentrations of sodium bicarbonate in the solution. To analyze the mass transport mechanism and quantify kinetic coefficients, we have exploited a linear driving force model (i.e., the LDF model) and the generalized model. The ion exchange and mass transfer characteristics of the Biofilm-covered carrier have been compared to those of the virgin zeolite. The effect of Biofilm on the mass transfer kinetics and ion exchange capacity was found to be induced by swelling properties of zeolite. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8002057