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Microbes in Human Welfare. — Bio Zoology STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12Bio ZoologyMicrobes in Human Welfare.2 Marks
Question
Define activated sludge.
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Answer

Once the BOD of sewage water is reduced significantly, the effluent is then passed into a settling tank where the bacterial “floes” are allowed to sediment. This sediment is called activated sludge.

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