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

Support the growth of anaerobic bacteria

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Support the growth of aerobic bacteria

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Disinfect water

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Blow human waste

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Solution

The correct option is B
Support the growth of 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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