Solution:
Option (a) is the answer.
To be pumped back to the aeration tank, the activated sludge must settle fast. ‘Be swiftly pumped back from the sedimentation tank to the aeration tank’ is the proper choice.
Solution:
Option (a) is the answer.
To be pumped back to the aeration tank, the activated sludge must settle fast. ‘Be swiftly pumped back from the sedimentation tank to the aeration tank’ is the proper choice.