activated sludge
Concise Oxford English Dictionary © 2008 Oxford University Press:
activated sludge
▶noun aerated sewage containing aerobic microorganisms which help to break it down.
'activated sludge' also found in these Oxford entries:
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activated sludgeConcise Oxford English Dictionary © 2008 Oxford University Press: activated sludge ▶noun aerated sewage containing aerobic microorganisms which help to break it down. 'activated sludge' also found in these Oxford entries:
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