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Select incorrect w.r.t. sewage treatment...

Select incorrect w.r.t. sewage treatment plants.

A

In anarobic sludge digester,gases like methane,H2s and CO2 are also produced

B

Primary treatment of sludge is based on sequential filtration and sedimentation

C

Bacteria flocs are allowed to sediment in settling tank whwn BOD of sewage is high

D

Activated sludge is pumped into anaerobic sludge digesters to digest the bacteia and fungi

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