In water treatment, alum [Al2(SO4)3] is used for the process of __________________?
Correct answer: D. Coagulation
- A. Filtration
- B. Disinfection
- C. Sedimentation
- D. Coagulation
Explanation
Alum hydrolyses in water to form gelatinous aluminium hydroxide flocs, which enmesh and destabilise suspended particles. This treatment step is coagulation, not filtration, sedimentation or disinfection.
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