The effect of global velocity gradient on the character and filterability of aggregates formed during the coagulation/flocculation process

Pivokonský, Martin; Bubáková, Petra; Pivokonská, Lenka; Hnaťuková, Petra

doi:https://dx.doi.org/10.1080/09593330.2010.536786

Number of the records: 1

The effect of global velocity gradient on the character and filterability of aggregates formed during the coagulation/flocculation process

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SYSNO ASEP	0360835
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	The effect of global velocity gradient on the character and filterability of aggregates formed during the coagulation/flocculation process
Author(s)	Pivokonský, Martin (UH-J)_{SAI, ORCID, RID} Bubáková, Petra (UH-J)_{SAI, ORCID, RID} Pivokonská, Lenka (UH-J)_{SAI, ORCID, RID} Hnaťuková, Petra (UH-J)_{RID, SAI, ORCID}
Source Title	Environmental Technology. - : Taylor & Francis - ISSN 0959-3330 Roč. 32, č. 12 (2011), s. 1355-1366
Number of pages	12 s.
Language	eng - English
Country	GB - United Kingdom
Keywords	aggregate size distribution ; flocculation ; mixing ; fractal dimension ; filtration
Subject RIV	BK - Fluid Dynamics
R&D Projects	IAA200600902 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
CEZ	AV0Z20600510 - UH-J (2005-2011)
UT WOS	000296187700005
EID SCOPUS	80052830572
DOI	10.1080/09593330.2010.536786
Annotation	Paper describes the influence of the global velocity gradient G on the properties of aggregates formed during the coagulation/flocculation process. The methods of image and fractal analysis were used to determine aggregate size and structure, respectively. The influence of these aggregate properties on separation using depth filtration is also described. The suspension was formed in a flow mixing tank with global velocity gradients ranging from 28.4–307.2 s⁻¹ and ferric sulphate used as a coagulant. Predictably, it was shown that the aggregate size decreased with increasing global velocity gradient G. Furthermore it was demonstrated that, with increasing G, the aggregates became more compact and regular and the suspension became more homogeneous in size. The aggregates with the smallest diameter and highest fractal dimension displayed the best filterability, i.e. penetrated throughout the full depth of the filter bed and generated a minimum pressure drop.
Workplace	Institute of Hydrodynamics
Contact	Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003
Year of Publishing	2012

Number of the records: 1