activated sludge

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activated sludge

[′ak·tə‚vād·əd ′sləj]
(civil engineering)
A semiliquid mass removed from the liquid flow of sewage and subjected to aeration and aerobic microbial action; the end product is dark to golden brown, partially decomposed, granular, and flocculent, and has an earthy odor when fresh.

activated sludge

Sewage sediment that has been subjected to vigorous aeration and the action of microorganisms.