Engineering Board Exam Reviewer · Environmental Engineering · easy

The activated sludge process is a/an:

1. Anaerobic attached-growth process
2. Aerobic suspended-growth biological treatment process
3. Physical sedimentation process
4. Chemical precipitation process

Answer

B. Aerobic suspended-growth biological treatment process

Solution

Microorganisms are kept suspended and aerated; part of the settled sludge is recycled.

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