What is activated sludge in a sewage tre...

What is activated sludge in a sewage treatment tank? How this activated sludge is used?

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One that BOD of sewage water is reduced significantly, the effluent is passed into a settling tank where aerobic bacterial flocs undergo sedimentation and is called activated sludge.
A small part of the activated sludge is pumped into aeration tank as inoculum for the treatment of sewage water.

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What is activated sludge in a sewage treatment tank? How this activated sludge is used?

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