In alum coagulation, adequate alkalinity in raw water is needed mainly to:
Correct answer: A. Neutralize acidity produced during alum reaction
- A. Neutralize acidity produced during alum reaction
- B. Increase the dissolved oxygen concentration
- C. Prevent all microbial growth in water
- D. Convert suspended solids into dissolved salts
Explanation
Alum hydrolysis produces acidity, so alkalinity helps maintain a suitable pH and supports formation of aluminium hydroxide flocs. Alkalinity does not act as a disinfectant or directly increase dissolved oxygen.
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