Which distinction between primary effluent and activated sludge is correct?
- AActivated sludge forms before primary treatment
- BBoth terms refer to the same material
- CPrimary effluent is the supernatant from primary sedimentation, whereas activated sludge is settled microbial floc from secondary treatment
- DPrimary effluent is settled floc, whereas activated sludge is floating debris
✓ Correct answer: C
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