Počet záznamů: 1
The influence of velocity gradient on properties and filterability of suspension formed during water treatment
- 1.0376735 - ÚH 2013 RIV GB eng J - Článek v odborném periodiku
Bubáková, Petra - Pivokonský, Martin
The influence of velocity gradient on properties and filterability of suspension formed during water treatment.
Separation and Purification Technology. Roč. 92, May (2012), s. 161-167. ISSN 1383-5866. E-ISSN 1873-3794.
[European Conference on Fluid-Particle Separation (FPS 2010). Lyon, 05.10.2010-07.10.2010]
Grant CEP: GA ČR GAP105/11/0247
Výzkumný záměr: CEZ:AV0Z20600510
Klíčová slova: aggregation * fractal dimension * filtration * particle size distribution * velocity gradient
Kód oboru RIV: BK - Mechanika tekutin
Impakt faktor: 2.894, rok: 2012
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.
Trvalý link: http://hdl.handle.net/11104/0209063
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