Which of the following components are involved in the secon…

Biology Microbes in Human Welfare Skill Builder Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 21, 2026

Which of the following components are involved in the secondary treatment of sewage?

Settling tank
, , ,

Aeration tank , and ,

Anaerobic sludge digester
and and (E) only and

Activated sludge
(E) Inlet for raw sewage Choose the correct answer from the options given below: only only

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The secondary treatment of sewage includes components such as aeration tanks, settling tanks, and anaerobic sludge digesters. Aeration tanks promote the growth of aerobic microbes to reduce BOD. The effluent then moves to settling tanks where flocs form activated sludge, which is digested anaerobically to produce biogas.

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