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The process of removal of water from the sludge is called ______

(a) Dewatering

(b) Thickening

(c) Digestion

(d) Drying

I had been asked this question by my college professor while I was bunking the class.

I want to ask this question from Mechanical Aeration System, Treatment of Sludge topic in section Sewage Filtration and Activated Sludge Process of Environmental Engineering

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Right option is (a) Dewatering

For explanation I would say: Dewatering is the process of removal of water from the sludge. It can be done by drying or subjected the sludge with pressure.

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