Primary sludge contains:

Methanogens and fungi

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Bacterial flocs

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Soil and small pebbles

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Aerobic bacteria and anaerobic bacteria

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C Soil and small pebbles
Primary sludge contains soil and small pebbles. Bacterial flocs are seen in activated sludge.

Suggest Corrections

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.

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

Join BYJU'S Learning Program