Outlined below is the sequence of unit operations and chemical additions used in the treatment of a reservoir water supply. Briefly state the function or purpose of each unit process and the reason for each chemical addition.
1. Intermillent applications of copper sulfate to the reservoir duru1g summe1 and fall
2. Chlorine dioxide available when needed
3. Mixing and flocculation with the addition of alum and polymer
4. Sedimentation
S. Addition of activated carbon
6. Granular-media filtration
7. Postchlorination
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