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The influence of velocity gradient on properties and filterability of suspension formed during water treatment
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SYSNO ASEP 0376735 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název The influence of velocity gradient on properties and filterability of suspension formed during water treatment Tvůrce(i) Bubáková, Petra (UH-J) SAI, ORCID, RID
Pivokonský, Martin (UH-J) SAI, ORCID, RIDZdroj.dok. Separation and Purification Technology. - : Elsevier - ISSN 1383-5866
Roč. 92, May (2012), s. 161-167Poč.str. 7 s. Akce European Conference on Fluid-Particle Separation (FPS 2010) Datum konání 05.10.2010-07.10.2010 Místo konání Lyon Země FR - Francie Typ akce EUR Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova aggregation ; fractal dimension ; filtration ; particle size distribution ; velocity gradient Vědní obor RIV BK - Mechanika tekutin CEP GAP105/11/0247 GA ČR - Grantová agentura ČR CEZ AV0Z20600510 - UH-J (2005-2011) UT WOS 000304584500023 EID SCOPUS 84860676726 DOI 10.1016/j.seppur.2011.09.031 Anotace This paper deals with the influence of the global velocity gradient G (in the range of 28–307 s-1) on properties of suspension (size and structure) formed during water treatment. Furthermore, it describes the influence of these properties on separation using depth filtration (filtration velocities of 3 and 6 m h-1). The methods of image and fractal analysis were used to determine the aggregate size and structure, respectively. The experiments were conducted in a pilot plant (a mixing tank and a rapid gravity sand filter) with ferric sulphate used as coagulant. The experiments confirmed that with an increasing velocity gradient the aggregate size decreased; the aggregate size distribution narrowed (suspension was more homogenous); the fractal dimension D2 increased (aggregates were more compact) and the fractal dimension Dpf diminished (aggregates were more regular). The smallest and most compact aggregates (d ~ 60 μm and D2 = 1.9) formed at G > 200 s-1 displayed the best filterability with the time of filtration up to 78 h. On the contrary, the filtration of large and porous aggregates formed at G ~ 30 s-1 lasted only about 30 h. Pracoviště Ústav pro hydrodynamiku Kontakt Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Rok sběru 2013
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