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The domestic sewage in large cities...

The domestic sewage in large cities

A

Have very high amounts of suspended solids and dissolved salts

B

Has a high BOD as it contains both aerobic and anaerobic bacteria

C

Is processed by aerobic and then anaerobic bacteria in the secondary treatment is Sewage Treatment Plants (STPs)

D

When treated in STPs does not really require the aeration step as the sewage contains adequate oxygen

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The correct Answer is:
C
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