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Degradation of aqueous p-nitrophenol by ozonation integrated with activated carbon / Li Gu in Industrial & engineering chemistry research, Vol. 47 N°18 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 6809–6815 Titre : Degradation of aqueous p-nitrophenol by ozonation integrated with activated carbon Type de document : texte imprimé Auteurs : Li Gu, Auteur ; Xingwang Zhang, Auteur ; Lecheng Lei, Auteur Année de publication : 2008 Article en page(s) : p. 6809–6815 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Aqueous  p-nitrophenol--degradation  Granular  activated  carbon Résumé : Degradation of aqueous p-nitrophenol (PNP) by ozonation integrated with granular activated carbon (GAC) was investigated. In the integrated process, organics were removed by the joint effect of oxidation and adsorption, and the removal was considerably enhanced. Operation parameters including pH value and ozone dosage were optimized, and pH was found to be the primary factor in the integrated process. Intermediates in PNP oxidation, including aromatic compounds and low-mass acids, were identified, and possible pathways of PNP degradation were introduced. The reaction mechanism was explored using radical scavenger to suspend the oxidation effect of radicals. The results indicated that the adsorption effect predominated in organics removal at acidic conditions while catalytic oxidation contributed primarily at basic conditions. In addition, the integrated process was successfully applied to treat a high concentrated real wastewater, showing that the integrated process would have great potential in practical application. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071584h [article] Degradation of aqueous p-nitrophenol by ozonation integrated with activated carbon [texte imprimé] / Li Gu, Auteur ; Xingwang Zhang, Auteur ; Lecheng Lei, Auteur . - 2008 . - p. 6809–6815. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 6809–6815 Mots-clés : Aqueous  p-nitrophenol--degradation  Granular  activated  carbon Résumé : Degradation of aqueous p-nitrophenol (PNP) by ozonation integrated with granular activated carbon (GAC) was investigated. In the integrated process, organics were removed by the joint effect of oxidation and adsorption, and the removal was considerably enhanced. Operation parameters including pH value and ozone dosage were optimized, and pH was found to be the primary factor in the integrated process. Intermediates in PNP oxidation, including aromatic compounds and low-mass acids, were identified, and possible pathways of PNP degradation were introduced. The reaction mechanism was explored using radical scavenger to suspend the oxidation effect of radicals. The results indicated that the adsorption effect predominated in organics removal at acidic conditions while catalytic oxidation contributed primarily at basic conditions. In addition, the integrated process was successfully applied to treat a high concentrated real wastewater, showing that the integrated process would have great potential in practical application. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071584h

Inactivation of bacteria in oil-field reinjection water by pulsed electric field (PEF) process / Qing Xin in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9644–9650 Titre : Inactivation of bacteria in oil-field reinjection water by pulsed electric field (PEF) process Type de document : texte imprimé Auteurs : Qing Xin, Auteur ; Xingwang Zhang, Auteur ; Lecheng Lei, Auteur Année de publication : 2009 Article en page(s) : p. 9644–9650 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Inactivation  of  bacteria  Oil-Field  Reinjection  water Résumé : Microbial pollution commonly causes serious pipe corrosion in oil-field reinjection water systems. As an alternative and environmentally friendly inactivation technology, the pulsed electric field (PEF) process is employed to inactivate microorganisms in oil-field reinjection water. The effects on inactivation of process parameters including electric field strength, process temperature, initial bacteria concentration, and conductivity were investigated. The results showed that electric field intensity is the most important parameter in PEF inactivation. After a 20-min treatment, the inactivation efficiency was a 2.8 log reduction for saprophytic bacteria, a 3.6 log reduction for iron bacteria, and a 3.9 log reduction for sulfate-reducing bacteria. Transmission electron microscopy observations of the bacteria confirmed that PEF technology can lead to severe surface damage and rupture to the cells. Moreover, a possible mechanism of inactivation is discussed and used to explain the influence of process parameters on PEF treatment. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8000524 [article] Inactivation of bacteria in oil-field reinjection water by pulsed electric field (PEF) process [texte imprimé] / Qing Xin, Auteur ; Xingwang Zhang, Auteur ; Lecheng Lei, Auteur . - 2009 . - p. 9644–9650. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9644–9650 Mots-clés : Inactivation  of  bacteria  Oil-Field  Reinjection  water Résumé : Microbial pollution commonly causes serious pipe corrosion in oil-field reinjection water systems. As an alternative and environmentally friendly inactivation technology, the pulsed electric field (PEF) process is employed to inactivate microorganisms in oil-field reinjection water. The effects on inactivation of process parameters including electric field strength, process temperature, initial bacteria concentration, and conductivity were investigated. The results showed that electric field intensity is the most important parameter in PEF inactivation. After a 20-min treatment, the inactivation efficiency was a 2.8 log reduction for saprophytic bacteria, a 3.6 log reduction for iron bacteria, and a 3.9 log reduction for sulfate-reducing bacteria. Transmission electron microscopy observations of the bacteria confirmed that PEF technology can lead to severe surface damage and rupture to the cells. Moreover, a possible mechanism of inactivation is discussed and used to explain the influence of process parameters on PEF treatment. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8000524