Activated sludge refers to a sludge particles produced in raw or settled wastewater (primary effluent) by the growth of organisms (including zoogleal bacteria) in aeration tanks in the presence of dissolved oxygen. The term "activated" comes from the fact that the particles are teeming with fungi, bacteria, and protozoa. Activated sludge is different from primary sludge in that the sludge particles contain many living organisms which can feed on the incoming wastewater.
Ref: 86388/2006-09-14

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Bacteria (A Bacteria is a one-celled organisms. Many act as ...)
Aeration (Aeration is a term in aquaculture systems that ...)
Aeration (An Aeration is a process which promotes ...)

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