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activated sludge
ac·ti·vat·ed sludge


noun 
Definition:
 
treated sewage: aerated sewage containing microorganisms, added to untreated sewage to purify it by accelerating its bacterial decomposition
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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