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Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYMicrobes in Human Welfare1 Mark
Question
Differentiate between primary sludge and activated sludge.
✓

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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