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The domestic sewage in large cities...

The domestic sewage in large cities

A

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

B

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

C

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

D

has very high amounts of suspended solids and dissolved salts

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