The domestic sewage in large cities:

Biology Environmental Issues ( Not In Syllabus ) NCERT Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 11, 2026

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

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

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

has very high amounts of suspended solids and dissolved salts

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