Outlined below is the sequence of unit operations and chemical additions used in the treatment of a brackish groundwater. Briefly state the function or purpose of each unit process and the reason for each chemical addition.
1. Acidification with sulfuric acid
2. Addition of sodium hexametaphosphate
3. Cartridge filtration
4. High-pressure pumps
5. Reverse-osmosis modules
6. Degasification using stripping towers
7. Addition of sodium hydroxide
8. Addition of chlorine
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