Activated sludge is obtained by passing air through the sludge obtained from primary treatment.

True

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False

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Solution

The correct option is A True
Sludge refers to solids like faeces that settle at the bottom of large settlement tanks during primary treatment of water.
When air is passed through sludge, it helps the aerobic bacteria grow. These bacteria decompose the organic matter present in wastewater.
They are obtained by passing air through sludge obtained from primary treatment.

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Similar questions

	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.

Activated sludge is obtained after aeration, settling and filtration using sand beds. Choose the options that are true regarding activated sludge.

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