Question

What is activated sludge?

• A. Distilled bacteria
• B. Fermented bacteria
• C. Sediment bacterial flocs
• D. Fungi

Answer 1

Answer:

C. Sediment bacterial flocs

• Activated sludge are the sediment bacterial flocs which were present in the effluent.

• When the biochemical oxygen demand of sewage water is reduced significantly, the effluent is then passed into a settling tank where the bacterial flocs are allowed to sediment.