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The answer is 35 min.
The detention time (minutes) in a rectangular flocculation basin when the flow is 0.7 mgd, is 35 min.
What is flocculation basin?
The process of flocculation requires that the coagulated water be gently mixed at a propeller speed of 15 to 20 rpm in order to encourage the growth of the floc. To agglomerate the floes into sizes between 0.1 and 2.0 mm that can be removed by sedimentation, slow mixing is used. By bringing the finely divided substance into touch with the micro-floes created during rapid mixing, slow mixing is the hydrodynamic process that produces big and easily settleable floes.
These floes can then be cleaned out in a clarifier, and the leftovers can be filtered. Usually, flocculation lasts between 30 and 60 minutes.
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