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What is activated sludge? How it is different from primary sludge?

What is activated sludge? How it is different from primary sludge?

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The term sluge denotes the group of microorganisms like bacteria, protozoa and fungi which are added to the wastewater for treating the water for decomposition of the contaminants. It is the biological process by which waste decomposition is carried out. The activated sluge is different from the primary sluge as the microbes (activated) are added to the incoming wastewater for cleanup. In this process the high quality of effluents are produced and comtaminants are removed out biologically.

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