Documents disponibles écrits par cet auteur

Effect of membrane filtration on ozonation efficiency for removal of atrazine from surface water / Patricia Luis in Industrial & engineering chemistry research, Vol. 50 N° 14 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8686-8692 Titre : Effect of membrane filtration on ozonation efficiency for removal of atrazine from surface water Type de document : texte imprimé Auteurs : Patricia Luis, Auteur ; Mohd Saquib, Auteur ; Chris Vinckier, Auteur Année de publication : 2011 Article en page(s) : pp. 8686-8692 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Membrane  separation  Surface  water  Ozonization  Membrane  filtration Résumé : The kinetics of the decay rate of atrazine from surface water by ozonation was studied at pH 3, 7, and 9 without and with pretreatment with several pressure-driven membrane filtration methods: ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO), in order to determine the influence of the feedwater quality on the chemical oxidation of atrazine. First, the atrazine decay rate was determined in surface water (without pretreatment with membranes) in the presence of natural organic matter (NOM). An increase in the atrazine decay rate is observed at pH 3 and 7 in surface water, which can be attributed to the presence of NOM since it acts as OH radicals promoter. However, at pH = 9, the NOM effect vanishes since at this high pH, the advanced oxidation process (AOP) effect becomes far dominant. The efficiency of combining membrane filtration techniques with a subsequent ozonation step for removing atrazine from surface water mainly depends on the pH and the molecular weight fraction of the NOM. Under acidic conditions only UF enhances the atrazine decay rate since this technique does not retain the low molecular weight fraction of the NOM, which acts as OH radical promoter, while removing the high molecular weight fraction of the NOM which acts as a radical scavenger. At pH = 7, the presence of carbonate/bicarbonate ions as OH radical scavengers starts to prevail over the NOM effect. Because RO is the most efficient technique to decrease the carbonate/bicarbonate content, RO enhances the atrazine decay by more than 50%. At pH = 9, the AOP effect becomes by far dominant and annuls the NOM and carbonate/ bicarbonate effect. The efficiency of membrane filtration techniques becomes doubtful in view of their marginal effe DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346907 [article] Effect of membrane filtration on ozonation efficiency for removal of atrazine from surface water [texte imprimé] / Patricia Luis, Auteur ; Mohd Saquib, Auteur ; Chris Vinckier, Auteur . - 2011 . - pp. 8686-8692. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8686-8692 Mots-clés : Membrane  separation  Surface  water  Ozonization  Membrane  filtration Résumé : The kinetics of the decay rate of atrazine from surface water by ozonation was studied at pH 3, 7, and 9 without and with pretreatment with several pressure-driven membrane filtration methods: ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO), in order to determine the influence of the feedwater quality on the chemical oxidation of atrazine. First, the atrazine decay rate was determined in surface water (without pretreatment with membranes) in the presence of natural organic matter (NOM). An increase in the atrazine decay rate is observed at pH 3 and 7 in surface water, which can be attributed to the presence of NOM since it acts as OH radicals promoter. However, at pH = 9, the NOM effect vanishes since at this high pH, the advanced oxidation process (AOP) effect becomes far dominant. The efficiency of combining membrane filtration techniques with a subsequent ozonation step for removing atrazine from surface water mainly depends on the pH and the molecular weight fraction of the NOM. Under acidic conditions only UF enhances the atrazine decay rate since this technique does not retain the low molecular weight fraction of the NOM, which acts as OH radical promoter, while removing the high molecular weight fraction of the NOM which acts as a radical scavenger. At pH = 7, the presence of carbonate/bicarbonate ions as OH radical scavengers starts to prevail over the NOM effect. Because RO is the most efficient technique to decrease the carbonate/bicarbonate content, RO enhances the atrazine decay by more than 50%. At pH = 9, the AOP effect becomes by far dominant and annuls the NOM and carbonate/ bicarbonate effect. The efficiency of membrane filtration techniques becomes doubtful in view of their marginal effe DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346907

Kinetic study and scaleup of the oxidation of nanofiltration retentates by O3 / Steven Van Geluwe in Industrial & engineering chemistry research, Vol. 51 N° 20 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 20 (Mai 2012) . - pp. 7056-7066 Titre : Kinetic study and scaleup of the oxidation of nanofiltration retentates by O3 Type de document : texte imprimé Auteurs : Steven Van Geluwe, Auteur ; Jan Degreve, Auteur ; Chris Vinckier, Auteur Année de publication : 2012 Article en page(s) : pp. 7056-7066 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Membrane  separation  Nanofiltration  Oxidation  Kinetics Résumé : This paper reports on the upscaling of an O3 reactor for the oxidation of natural organic matter. Natural organic matter is responsible for fouling of nanofiltration membranes used for drinking water production. The proposed concept is to feed the retentate stream of a nanofiltration module (400 m3 h―1) to an O3 reactor (bubble column) and subsequently recycle it to a second nanofiltration module. The O3 oxidation of the retentate stream in the bubble column is analyzed in terms of the two-film theory with mass transfer and chemical reaction. The kinetic regime of the ozonation process, i.e., the chemical reaction rate relative to the mass-transfer rate, is determined using data from laboratory-scale experiments. This information is used for the calculation of the reactor volume and the required O3 dose on an industrial scale. An economic assessment of the integrated nanofiltration―O3 oxidation process also is given. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25925047 [article] Kinetic study and scaleup of the oxidation of nanofiltration retentates by O3 [texte imprimé] / Steven Van Geluwe, Auteur ; Jan Degreve, Auteur ; Chris Vinckier, Auteur . - 2012 . - pp. 7056-7066. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 20 (Mai 2012) . - pp. 7056-7066 Mots-clés : Membrane  separation  Nanofiltration  Oxidation  Kinetics Résumé : This paper reports on the upscaling of an O3 reactor for the oxidation of natural organic matter. Natural organic matter is responsible for fouling of nanofiltration membranes used for drinking water production. The proposed concept is to feed the retentate stream of a nanofiltration module (400 m3 h―1) to an O3 reactor (bubble column) and subsequently recycle it to a second nanofiltration module. The O3 oxidation of the retentate stream in the bubble column is analyzed in terms of the two-film theory with mass transfer and chemical reaction. The kinetic regime of the ozonation process, i.e., the chemical reaction rate relative to the mass-transfer rate, is determined using data from laboratory-scale experiments. This information is used for the calculation of the reactor volume and the required O3 dose on an industrial scale. An economic assessment of the integrated nanofiltration―O3 oxidation process also is given. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25925047