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Microbes In Human Welfare

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Differentiate primary sludge and activated sludge.

Solution

Differences between primary sludge and activated sludge

Primary sludge	Activated sludge
1. The settled or sedimented solid during the primary treatment of sewage forms the primary sludge	1. The sediments formed by the bacterial flocs from the effluent during the primary treatment, constitute the activated sludge.
2. Microorganisms are not used.	2. Microorganisms are used.

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