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Internal treatment of process waters in paper production by dissolved air flotation with newly developed chemicals. 1. laboratory tests / Ruben Miranda in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2199–2205 Titre : Internal treatment of process waters in paper production by dissolved air flotation with newly developed chemicals. 1. laboratory tests Type de document : texte imprimé Auteurs : Ruben Miranda, Auteur ; Carlos Negro, Auteur ; Angeles Blanco, Auteur Année de publication : 2009 Article en page(s) : p. 2199–2205 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Inorganic  polyaluminium  salts  Organic  cationic  polyelectrolytes  Dissolved  air  flotation  Chemical  optimization Résumé : New chemicals, based on the synergistic effect between inorganic polyaluminium salts and organic cationic polyelectrolytes, have been tested for the chemical optimization of a dissolved air flotation (DAF) unit, used as internal treatment of process waters in a paper mill based on 100% recovered paper. Laboratory tests have demonstrated that polyamine modifications of the aluminum salts are the most efficient in the removal of contaminants, the combination of a polyaluminium nitrate sulfate salt and a polyamine being the most efficient. This chemical has been studied under different conditions, such as different dosages or in combination with a flocculant for the treatment of waters from different paper grades production, and the results have demonstrated a good performance at laboratory scale. Therefore, a field trial has been recommended for assessing its potential benefits at mill scale, which will be described in a future paper. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801047h [article] Internal treatment of process waters in paper production by dissolved air flotation with newly developed chemicals. 1. laboratory tests [texte imprimé] / Ruben Miranda, Auteur ; Carlos Negro, Auteur ; Angeles Blanco, Auteur . - 2009 . - p. 2199–2205. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2199–2205 Mots-clés : Inorganic  polyaluminium  salts  Organic  cationic  polyelectrolytes  Dissolved  air  flotation  Chemical  optimization Résumé : New chemicals, based on the synergistic effect between inorganic polyaluminium salts and organic cationic polyelectrolytes, have been tested for the chemical optimization of a dissolved air flotation (DAF) unit, used as internal treatment of process waters in a paper mill based on 100% recovered paper. Laboratory tests have demonstrated that polyamine modifications of the aluminum salts are the most efficient in the removal of contaminants, the combination of a polyaluminium nitrate sulfate salt and a polyamine being the most efficient. This chemical has been studied under different conditions, such as different dosages or in combination with a flocculant for the treatment of waters from different paper grades production, and the results have demonstrated a good performance at laboratory scale. Therefore, a field trial has been recommended for assessing its potential benefits at mill scale, which will be described in a future paper. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801047h

Internal treatment of process waters in paper production by dissolved air flotation with newly developed chemicals. 2. Field trials / Ruben Miranda in Industrial & engineering chemistry research, Vol. 48 N° 7 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3672–3677 Titre : Internal treatment of process waters in paper production by dissolved air flotation with newly developed chemicals. 2. Field trials Type de document : texte imprimé Auteurs : Ruben Miranda, Auteur ; Carlos Negro, Auteur ; Angeles Blanco, Auteur Année de publication : 2009 Article en page(s) : pp. 3672–3677 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Inorganic  polyaluminium  salts  Organic  cationic  polyelectrolytes  Dissolved  air  flotation Résumé : New chemicals, based on the synergistic effect between inorganic polyaluminium salts and organic cationic polyelectrolytes, have been tested previously at laboratory-scale, and the most efficient product has been selected for an industrial trial for a dissolved air flotation unit of a paper mill based on 100% recovered paper (part 1 of this work). A polyaluminium nitrate sulfate salt combined with a quaternary polyamine has been evaluated in a long-term industrial trial for assessing its potential benefits. Results indicate that this new chemical is able to improve the removal of contaminants by dissolved air flotation, especially when the contamination load of the waters is high, allowing a further closure of the water circuits. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801826m [article] Internal treatment of process waters in paper production by dissolved air flotation with newly developed chemicals. 2. Field trials [texte imprimé] / Ruben Miranda, Auteur ; Carlos Negro, Auteur ; Angeles Blanco, Auteur . - 2009 . - pp. 3672–3677. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3672–3677 Mots-clés : Inorganic  polyaluminium  salts  Organic  cationic  polyelectrolytes  Dissolved  air  flotation Résumé : New chemicals, based on the synergistic effect between inorganic polyaluminium salts and organic cationic polyelectrolytes, have been tested previously at laboratory-scale, and the most efficient product has been selected for an industrial trial for a dissolved air flotation unit of a paper mill based on 100% recovered paper (part 1 of this work). A polyaluminium nitrate sulfate salt combined with a quaternary polyamine has been evaluated in a long-term industrial trial for assessing its potential benefits. Results indicate that this new chemical is able to improve the removal of contaminants by dissolved air flotation, especially when the contamination load of the waters is high, allowing a further closure of the water circuits. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801826m

New tool to monitor biofilm growth in industrial process waters / Angeles Blanco in Industrial & engineering chemistry research, Vol. 50 N° 9 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5766–5773 Titre : New tool to monitor biofilm growth in industrial process waters Type de document : texte imprimé Auteurs : Angeles Blanco, Auteur ; Esperanza Torres, Auteur ; Elena Fuente, Auteur Année de publication : 2011 Article en page(s) : pp. 5766–5773 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Biofilm  Industrial  process  waters Résumé : A new online methodology based on a continuous process video microscopy and image analysis has been developed to study the effects of enzymes on the formation of biofilm. This research consists of two parts: (1) the monitoring of the growth of a biofilm formed with the axenic culture isolated from the process waters of a recycling paper mill, aiming at determining the most appropriate way to quantify the biofilm growth from the obtained images; and (2) the study of the effects of three new enzymatic products on biofilm formation involving the natural flora of microorganisms present in the process water of the paper mill. The results demonstrate that the new methodology based on image analysis allows monitoring of the formation of biofilm and selecting the most efficient biofilm control product. The study also shows that enzymatic products could be an alternative for biocides on biofilm prevention and control. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101422m [article] New tool to monitor biofilm growth in industrial process waters [texte imprimé] / Angeles Blanco, Auteur ; Esperanza Torres, Auteur ; Elena Fuente, Auteur . - 2011 . - pp. 5766–5773. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5766–5773 Mots-clés : Biofilm  Industrial  process  waters Résumé : A new online methodology based on a continuous process video microscopy and image analysis has been developed to study the effects of enzymes on the formation of biofilm. This research consists of two parts: (1) the monitoring of the growth of a biofilm formed with the axenic culture isolated from the process waters of a recycling paper mill, aiming at determining the most appropriate way to quantify the biofilm growth from the obtained images; and (2) the study of the effects of three new enzymatic products on biofilm formation involving the natural flora of microorganisms present in the process water of the paper mill. The results demonstrate that the new methodology based on image analysis allows monitoring of the formation of biofilm and selecting the most efficient biofilm control product. The study also shows that enzymatic products could be an alternative for biocides on biofilm prevention and control. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101422m

Polymeric branched flocculant effect on the flocculation process of pulp suspensions in the papermaking industry / Angeles Blanco in Industrial & engineering chemistry research, Vol. 48 N° 10 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4826–4836 Titre : Polymeric branched flocculant effect on the flocculation process of pulp suspensions in the papermaking industry Type de document : texte imprimé Auteurs : Angeles Blanco, Auteur ; Elena Fuente, Auteur ; M. Concepcion Monte, Auteur Année de publication : 2009 Article en page(s) : pp. 4826–4836 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Cationic  polyacrylamides  Pulp  suspensions  Floc  properties  Focused  beam  reflectance  measurement Résumé : This paper presents the effect of the structure of cationic polyacrylamides (CPAMs) on flocculation of pulp suspensions and floc properties. A focused beam reflectance measurement (FBRM) probe was used to monitor flocculation, deflocculation, and reflocculation processes in real time. To carry out the study, 1% elemental chlorine free (ECF) eucalyptus kraft pulp containing 20% ground calcium carbonate (GCC) was used. Results show that the effect of the CPAM structure depends on charge density and polymer dose. Floc size does not always decrease with branching degree, whereas floc stability and reflocculation ability increased when highly charged and branched CPAM was used. These findings indicate that the use of highly branched CPAMs with very high molecular weight is very promising as a retention aid method to improve the papermaking process. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8011837 [article] Polymeric branched flocculant effect on the flocculation process of pulp suspensions in the papermaking industry [texte imprimé] / Angeles Blanco, Auteur ; Elena Fuente, Auteur ; M. Concepcion Monte, Auteur . - 2009 . - pp. 4826–4836. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4826–4836 Mots-clés : Cationic  polyacrylamides  Pulp  suspensions  Floc  properties  Focused  beam  reflectance  measurement Résumé : This paper presents the effect of the structure of cationic polyacrylamides (CPAMs) on flocculation of pulp suspensions and floc properties. A focused beam reflectance measurement (FBRM) probe was used to monitor flocculation, deflocculation, and reflocculation processes in real time. To carry out the study, 1% elemental chlorine free (ECF) eucalyptus kraft pulp containing 20% ground calcium carbonate (GCC) was used. Results show that the effect of the CPAM structure depends on charge density and polymer dose. Floc size does not always decrease with branching degree, whereas floc stability and reflocculation ability increased when highly charged and branched CPAM was used. These findings indicate that the use of highly branched CPAMs with very high molecular weight is very promising as a retention aid method to improve the papermaking process. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8011837