The domestic sewage in large cities – McqOptions

MCQOPTIONS

1.	The domestic sewage in large cities
A.	has high BOD as it contains both aerobic and 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
Answer» C. when treated in STPs does not really require the aeration step as the sewage contains adequate oxygen

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