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activated sludge

noun
1.
sludge (def 8).
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for activated sludge

activated sludge

noun
1.
a mass of aerated precipitated sewage added to untreated sewage to bring about purification by hastening decomposition by microorganisms
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Value for activated

15
17
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