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The dominating microorganisms in an activated sludge process reactor are

1. aerobic heterotrophs
2. anaerobic heterotrophs
3. autotrophs
4. phototrophs

Correct answer: aerobic heterotrophs

Solution

Aerobic heterotrophs are the primary microorganisms in an activated sludge process because they thrive in oxygen-rich environments, breaking down organic matter and contributing to the treatment of wastewater.

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