. . . "7"^^ . . . "The influence of velocity gradient on properties and filterability of suspension formed during water treatment" . "[26672DCBCF2D]" . . "This paper deals with the influence of the global velocity gradient G (in the range of 28\u2013307 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 \u03BCm 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." . "aggregation; fractal dimension; filtration; particle size distribution; velocity gradient"@en . . "May" . "The influence of velocity gradient on properties and filterability of suspension formed during water treatment"@en . "The influence of velocity gradient on properties and filterability of suspension formed during water treatment"@en . . . "This paper deals with the influence of the global velocity gradient G (in the range of 28\u2013307 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 \u03BCm 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."@en . . "Pivokonsk\u00FD, Martin" . . . . "2"^^ . "RIV/67985874:_____/12:00376735!RIV13-AV0-67985874" . "GB - Spojen\u00E9 kr\u00E1lovstv\u00ED Velk\u00E9 Brit\u00E1nie a Severn\u00EDho Irska" . . "Bub\u00E1kov\u00E1, Petra" . . "2"^^ . "The influence of velocity gradient on properties and filterability of suspension formed during water treatment" . . "1383-5866" . "RIV/67985874:_____/12:00376735" . . . "92" . "141685" . "10.1016/j.seppur.2011.09.031" . "Separation and Purification Technology" . . . "000304584500023" . "P(GAP105/11/0247), Z(AV0Z20600510)" . .