Multiple choice

The design parameter for flocculation is given by a dimensionless number Gt, where G is the velocity gradient and t is the detention time. Values of Gt ranging from 104 to 105 are commonly used, with t ranging from 10 to 30 mm. The most preferred combination of G and t to produce smaller and denser floccus is

  1. large G values with short t

  2. large G values with long t

  3. small G values with long t

  4. small G values with short t
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

To produce dense flocs, a lower velocity gradient (G) is required to prevent floc breakage, while a longer detention time (t) allows for sufficient collision and growth.

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