During flocculation, what mixing regime promotes the formation of larger, more settleable flocs?

Slow mixing, specifically a regime characterized by gentle shear, promotes the formation of larger, more settleable flocs during flocculation. Flocculation is the process of destabilizing colloidal particles – tiny particles suspended in a liquid – and causing them to aggregate into larger clumps called flocs. These flocs should ideally be large and dense enough to settle out of the water under gravity. The key to achieving this lies in the mixing regime. Initially, rapid mixing, often referred to as dispersion or flash mixing, is used to distribute the flocculant (a chemical that promotes floc formation) evenly throughout the water. This ensures that all the colloidal particles are exposed to the flocculant. However, subsequent mixing must be significantly slower. Slow mixing....