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 part of their removal:

• A. Iron
• B. Cadmium
• C. Manganese
• D. Zinc

Hint:

Aeration is an effective method for removing dissolved metals like iron and manganese from water by converting them into solid particles that can be removed by sedimentation and filtration.

Answer 1

The Correct Option is A, C

Aeration is a process used in water treatment to promote the conversion of dissolved contaminants into solid particles that can be easily removed. It is particularly effective for the removal of certain dissolved metals.

• (A) Iron: Iron can be removed from water through aeration. It is converted into an insoluble precipitate, which can then be removed by sedimentation and filtration. (True)
• (B) Cadmium: Cadmium is not typically removed through aeration. It requires other methods such as ion exchange or reverse osmosis for effective removal. (False)
• (C) Manganese: Manganese is also removed through aeration. Similar to iron, manganese can be oxidized and precipitated out of the water, followed by sedimentation and filtration. (True)
• (D) Zinc: Zinc is typically removed by other methods like precipitation and filtration, not primarily by aeration. (False)

Therefore, the correct answers are (A) and (C).