Under which condition would it be necessary to increase mixing speeds?

Increasing mixing speeds is typically necessary under conditions where flocculent particles need to be adequately mixed into the water to enhance the aggregation and settling process. When water temperatures are low, the kinetic energy of the particles is also lower, which can hinder the effectiveness of floc formation and settling. Therefore, increasing mixing speeds in low-temperature scenarios helps to ensure that floc particles remain adequately suspended and can effectively come together to form larger, more cohesive masses that are easier to remove during subsequent treatment processes.

In contrast, high water temperatures tend to increase the movement and interactions between particles, potentially reducing the need for higher mixing speeds. Normal water temperatures usually maintain efficient floc formation without additional mixing. Excessive floc formation may require adjustments in mixing speeds, but this typically involves reducing mixing rather than increasing it to prevent further breakup of floc particles.