What is the process of removing contaminants from wastewater using microorganisms called?

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A Filtration
B Activated sludge process
C Chlorination
D Sedimentation

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Answer: B. Activated sludge process

Wastewater treatment plants use biological treatment (activated sludge) where microorganisms break down organic matter in wastewater.

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What is the process of removing contaminants from wastewater using microorganisms called?

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