Civil Engineering MCQAE Level Civil Engineering
Alum is used in water treatment mainly as a:
Environmental EngineeringEnvironmental EngineeringHARD
Choose the correct answer
A
filter medium
B
disinfectant gas
C
softening resin
D
coagulant
Correct Answer
D. coagulant
Why is this the answer?
Alum destabilises colloids and forms flocs that settle or are filtered out.
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