Outlined below is the sequence of unit operations and chemical additions used in the treatment of a well water supply. Briefly state the function 0r purpose of each unit process and the reason for each chemical addition.
1. Prechlorination at the wells
2. Mixing-flocculation-sedimentation in flocculator-clarifiers using split treatment with lime and alum added to one leg and potassium permanganate to the other leg
3. Granular-media filtration
4. Postchlorination
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