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What is rapid mixing?
Correct Answer:
Disperse chemicals quickly
Explanation:
Rapid mixing is the quick, thorough distribution of added coagulants in the water to destabilize suspended particles and kick off floc formation. The goal is to achieve uniform contact between the coagulant and colloids so their charges are neutralized and small particles begin to clump together. This requires high-energy mixing for a short time, after which gentler stirring allows larger flocs to form and then be removed by sedimentation or filtration. That’s why dispersing chemicals quickly is the best description. The other options don’t fit: dissolving chlorine is about disinfection, not the rapid distribution of coagulants; increasing temperature isn’t the aim of mixing; and filtration is a later step, not the mixing phase.

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