Activated sludge is the sludge with air in it. True or False?

True

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False

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Solution

The correct option is A True
Activated sludge is obtained after the aeration step in the wastewater treatment plant. When air is passed through the sludge, the microbial decomposition takes place and large flocks are obtained which settle down as the activated sludge.

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Similar questions

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

	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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