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

Activated sludge is dried and burnt as it is toxic.

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Activated sludge is dried and used as manure.

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Activated sludge is mostly made of settled bacteria and microbes.

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Activated sludge is buried in deep pits to avoid contamination.

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Solution

The correct options are
B
Activated sludge is dried and used as manure.

C
Activated sludge is mostly made of settled bacteria and microbes.

Activated sludge is mostly composed of bacteria that have settled at the bottom of the tank after aeration. This can be dried and used as manure due to its high organic content and presence of useful decomposing bacteria.

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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 should have the ability to settle quickly so that it can

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