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7% of solids concentration of thickened sludge is obtained from gravity thickener. What is the type of sludge?

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7% of solids concentration of thickened sludge is obtained from gravity thickener. What is the type of sludge?

(a) Primary sludge

(b) Secondary sludge

(c) Tertiary sludge

(d) Activated sludge

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I'm obligated to ask this question of Sludge Thickening, Sludge Dewatering in portion Sewage Filtration and Activated Sludge Process of Environmental Engineering

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Correct answer is (d) Activated sludge

Easy explanation: When the thickened sludge, solid concentration is between 7-9, the type of sludge obtained from gravity thickner is activated.

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