Activated sludge contains ______ percent water.

seventy-one

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ninety-seven

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sixty-six

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thirty-three

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Solution

The correct option is B ninety-seven
In wastewater treatment, air is pumped into clarified water to help the growth of aerobic bacteria. These bacteria consume human waste and other unwanted contaminants present in clarified water. After several hours, the suspended microbes settle at the bottom of the tank as sludge.

This sludge with dissolved air is called activated sludge. It contains ninety-seven percent water.

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Similar questions

Column A	Column B
I. Primary sludge	A. Production of biogas
II. Activated sludge	B. Solids like grit
III. Anaerobic sludge digesters	C. Contains aerobic heterotrophic bacteria

	Primary Sludge	Activated sludge
(i)	It is sludge formed during primary sewage treatment.	It is sludge formed during secondary sewage treatment.
(ii)	It possesses flocs of decomposer microbes.	It does not possess flocs of decomposer microbes.
(iii)	It does not require aeration.	Formation of activated sludge requires aeration.
(iv)	A lot of decomposition occurs during formation of primary sludge.	Very little decomposition occurs during formation of activated sludge.

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