Settling behavior of fine-grained materials in flocs / Jong-Woo Kim in Journal of hydraulic research, Vol. 47 N° 4 (2009)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 47 N° 4 (2009) . - pp. 492-502 Titre : Settling behavior of fine-grained materials in flocs Titre original : Comportement de la décantation des matériaux fins en floculation Type de document : texte imprimé Auteurs : Jong-Woo Kim, Auteur ; Franz Nestmann, Auteur Article en page(s) : pp. 492-502 Note générale : Hydraulique Résumé en Français Langues : Anglais (eng) Mots-clés : Concentration Deposition Flocculation Settling velocity Suspended particles Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : This paper contributes to the understanding of the effect of suspended sediment deposition and turbidity on aquatic systems. The influence of the cohesive properties of clay on its settling behaviour was quantified in still distilled water with ion addition. Two different model materials, alumina and quartz, were used, as their identical presentation in the mineral composition of clay affects the flocculation of suspended fine particles. The suspended concentrations were measured in a 1 m settling column using a CCD Camera. The settling rates of alumina and quartz increased with salinity, with the settling rates for alumina being higher than those for quartz at any given salinity. The settling velocities for alumina were higher at pH 9, whereas the opposite was true for quartz. Conversely, the settling velocities for quartz were higher at pH 4, while the velocities for alumina were then low. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com [article] Settling behavior of fine-grained materials in flocs = Comportement de la décantation des matériaux fins en floculation [texte imprimé] / Jong-Woo Kim, Auteur ; Franz Nestmann, Auteur . - pp. 492-502. Hydraulique Résumé en Français Langues : Anglais (eng) in Journal of hydraulic research > Vol. 47 N° 4 (2009) . - pp. 492-502 Mots-clés : Concentration Deposition Flocculation Settling velocity Suspended particles Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : This paper contributes to the understanding of the effect of suspended sediment deposition and turbidity on aquatic systems. The influence of the cohesive properties of clay on its settling behaviour was quantified in still distilled water with ion addition. Two different model materials, alumina and quartz, were used, as their identical presentation in the mineral composition of clay affects the flocculation of suspended fine particles. The suspended concentrations were measured in a 1 m settling column using a CCD Camera. The settling rates of alumina and quartz increased with salinity, with the settling rates for alumina being higher than those for quartz at any given salinity. The settling velocities for alumina were higher at pH 9, whereas the opposite was true for quartz. Conversely, the settling velocities for quartz were higher at pH 4, while the velocities for alumina were then low. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com

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