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What is activated sludge?

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What is activated sludge?

(a) Separation of liquid and solid phase

(b) Product of wastewater treatment

(c) Type of wastewater treatment

(d) Suspended solids

This question was addressed to me in an interview.

I'd like to ask this question from By-Products topic in chapter Effluent Treatment of Bioprocess Engineering

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Right option is (c) Type of wastewater treatment

To explain: The activated sludge process is a type of wastewater treatment process for treating sewage or industrial wastewaters using aeration and a biological floc composed of bacteria and protozoa.

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