In water treatment, aeration is the process which
ARemoves excess and objectionable gases ✓ Correct
BReadjusts the pH of water
CRemoves the large particles of floc from water
DRemoves the solid particles
Correct answer: (A) Removes excess and objectionable gases
Explanation
In water treatment, aeration removes excess and objectionable dissolved gases.
It drives off gases like carbon dioxide, hydrogen sulphide and methane by exposing water to air.
It does not primarily readjust pH, though gas removal can shift pH slightly.
It does not remove large flocs, which sedimentation and filtration handle.
It does not remove solid particles, that is the job of filtration.
Aeration also adds oxygen, helping oxidise dissolved iron and manganese.
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