Clarified water is then passed into aeration tanks, where it is agitated or sprayed. Air may also be bubbled through to increase oxygen levels in the water. Why is this step carried out in wastewater treatment plants?

Bad odour

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Dissolved salt

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Small suspended solids

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Bacteria

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Solution

The correct options are
A
Bad odour

B
Dissolved salt

C
Small suspended solids

Aeration facilitates the decomposition of organic semisolids by decomposing bacteria. It helps in the aerobic respiration by the bacteria.Thus, aeration promotes bacterial growth in the wastewater. Aeration in the clarified water helps also to remove bad odour. This step is also known as the biological treatment of wastewater.

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