ADEQ Water Treatment Grade 4 Practice Test

What happens in sedimentation after coagulation and flocculation?

Flocs settle by gravity. Water is filtered. Water is chlorinated. Coagulant is added again.

Correct Answer:

Flocs settle by gravity.

Explanation:

In sedimentation after coagulation and flocculation, the large, heavier flocs are allowed to settle to the bottom by gravity. This gravity-driven settling separates most of the suspended solids, giving clearer water at the top that can move on to filtration. The sludge collects at the bottom and is removed. This step is distinct from filtration (which comes next) and disinfection (which typically occurs after filtration). Coagulant is added earlier in the process, not again during sedimentation.

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