Activatedsludgeshouldhaveabilitytosettlequicklysothatitcan

Activated sludge should have the ability to settle quickly so that it can (a) Be … anaerobically digested (d) Absorb colloidal…

Answers:

(a) Activated sludge should have the ability to settle quickly so that it can be rapidly pumped back from sedimentation tank to aeration tank.