Outlined below is the sequence of unit operations and chemical additions used in the treatment of a well water supply. Briefly state the function or purpose of each unit process and the reason for each chemical addition.
1. Prechlorination at the wells
2. Aeration over a tray aerator
3. Rechlorination
4. Detention u1 a settling basin
5. Granular-media filtration
6. Addition of anhydrous ammonia
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