noun
a process used in wastewater treatment to break down organic matter using microorganisms in aeration tanks
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The activated sludge process is a common method used in wastewater treatment plants.
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They use the activated sludge process to clean up the water before releasing it back into the environment.
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They run the activated sludge process to get rid of all the nasty stuff in the water.
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The activated sludge process works like a natural filter, removing impurities from the water.