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The term 'activated sludge' is used to denote: |
All solids that settle as sediment Sediment containing all type of organic matter Sediment containing bacterial flocs Sedimentcontaining soil and small pebbles only |
Sediment containing bacterial flocs |
The correct answer is Option (3) → Sediment containing bacterial flocs Activated sludge refers to the sediment containing bacterial flocs, which are aggregates of bacteria and other microorganisms that form during the wastewater treatment process. These bacterial flocs play a crucial role in breaking down organic matter in the sewage, aiding in the purification of water. Activated sludge is formed in the aeration tank during the secondary treatment of sewage, where the sewage is aerated to allow bacteria to grow and form flocs. These flocs help in decomposing the organic waste present in the wastewater. |
