Document Detail


Experimental analysis of floc size distributions in a 1-L jar under different hydrodynamics and physicochemical conditions.
MedLine Citation:
PMID:  16054637     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
This study focuses on the relation among hydrodynamics, physicochemical conditions, and floc size. During ortho-kinetic flocculation, the floc size is controlled by a balance between hydrodynamic stress and aggregate strength. Special attention was paid to the influence of a hydrodynamic sequencing on both the aggregate strength and the flocculation processes. Experimental research was conducted in a 1-L jar for two different pH values. The hydrodynamic sequencing was made up of successive slow and rapid mixing periods, and different slow mixing intensities were studied. First, the large floc size was shown to decrease with increasing velocity gradient (G), with an expected trend (d proportional variant epsilon(-1/4)). Then, the aggregate strength was shown to depend on two main factors: the flocculation history and the physicochemical conditions, which control the cohesion forces between primary particles. Finally, flocculation processes are discussed in terms of aggregation and breakup phenomena, with relation to local hydrodynamics and physicochemical conditions.
Authors:
Denis Bouyer; Carole Coufort; Alain Liné; Zdravka Do-Quang
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Publication Detail:
Type:  Journal Article     Date:  2005-07-28
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  292     ISSN:  0021-9797     ISO Abbreviation:  J Colloid Interface Sci     Publication Date:  2005 Dec 
Date Detail:
Created Date:  2005-11-18     Completed Date:  2006-12-04     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  413-28     Citation Subset:  -    
Affiliation:
L.I.P.E., I.N.S.A., 135 Avenue de Rangueil, 31077 Toulouse cedex, France.
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