Paper 1 · People, Development and Environment
UGC NET December 2023 Re-Exam (14.12.2023) Shift-I
The standard coagulant used in water treatment is:
AHypochloride
BChlorine
CAluminium
DAlum ✓ Correct
Correct answer: (D) Alum — The standard coagulant in water treatment is alum, so the answer is alum.
Explanation
★The standard coagulant in water treatment is alum, so the answer is alum.
★Coagulation clumps fine suspended particles so they can settle and be removed.
★Alum, which is aluminium sulphate, is the most commonly used coagulant.
★It neutralises the charges on particles so they join into larger flocs.
★Ferric sulphate and ferric chloride are other common coagulants.
★Chlorine is used for disinfection, not for coagulation.
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