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Bacteria in Sewage

During wastew...

Question

During wastewater treatment, air is pumped into the water to promote growth of

A

Aerobic bacteria

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B

Anaerobic bacteria

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C

Fungi

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D

Viruses

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Solution

The correct option is A
Aerobic bacteria

Air is pumped into the clarified water to help aerobic bacteria to grow. Bacteria consume human waste, food waste, and other unwanted matter still remaining in the clarified water. After several hours, the suspended microbes settle at the bottom of the tank as activated sludge.

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In the wastewater treatment plant (WWTP), air is pumped into the water to:

Q. Assertion: During secondary treatment of sewage, the primary effluent is passed into large settling tanks and is constantly agitated mechanically and air is pumped into it.
Reason: This allows the vigorous growth of the useful anaerobic microbes.

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