The design parameter forflocculation is given by adimensionless number Gt - whereG is the velocity gradient and t isthe detention time. Values of Gtranging from 104 to 105 arecommonly used - with t rangingfrom 10 to 30mm. The mostpreffered combination of G and tto produce smaller and denserflocs is

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The design parameter forflocculation is given by adimensionless number Gt - whereG is the velocity gradient and t isthe detention time. Values of Gtranging from 104 to 105 arecommonly used - with t rangingfrom 10 to 30mm. The mostpreffered combination of G and tto produce smaller and denserflocs is