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Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYMicrobes in Human Welfare2 Marks
Question
Distinguish between primary sludge and activated sludge.
✓

Answer

Primary sludge includes all solid substances which got settled after primary treatment. It traps lot of microbes and debris.
Activated sludge is sediment formed from effluent after secondary treatment. It contains bacterial flocs.

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