Differentiate between primary sludge and activated sludge. - Vidyadip

Question

Differentiate between primary sludge and activated sludge.

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Answer

Primary Sludge	Activated Sludge
All solids that settle after primary treatment of sewage, constitute the primary sludge.	The sediments formed by the bacterial flocs from the effluent from the secondary treatment, constitute the activated sludge.

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