Respiration in PlantsHard

Question

The domestic sewage in large cities

Options

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 SewageTreatment Plants (STPs)
D.When treated in STPs does not really require the aeration step as the sewage contains adequateoxygen

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