Question

Explain the role of the following during the sewage treatment:
(a) Flocs
(b) Anaerobic sludge digester

Hint:

Sewage treatment plants play a vital role in water purification and waste management.

Answer 1

Flocs: Aggregates of bacteria and fungi used in the secondary treatment to degrade organic matter in sewage. Anaerobic sludge digester: Breaks down organic matter into methane, CO$_2$, and water during the anaerobic digestion of sludge.