GATE CE 2025 Set 1 — Question 32
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Environmental Engineering → Drinking Water Treatment → Aeration
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Question
Aeration is employed as a treatment option for the removal of several pollutants from contaminated water. Identify the pollutant(s), where aeration is employed as a part of their removal:
Correct answer
(A) Iron; (C) Manganese
Solution
Aeration is a common process in water treatment used to oxidize dissolved metals like Iron () and Manganese () into their insoluble forms ( and ), which can then be removed by sedimentation and filtration. It is not a standard method for removing heavy metals like Cadmium or Zinc.
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