Distinguish between roles of flocs and anaerobic sludge digesters in sewage treatments.

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Solution

Flocks contain aerobic microbes that grow in aeration tank during secondary treatment of effluent.
In anaerobic digester anaerobic type of bacteria grow and digest and produce a mixture of gases such as methane, hydrogen sulfide, and carbon dioxide.

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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.

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