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What is the sludge thickener?

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in Bioprocess Engineering by (80.7k points)
What is the sludge thickener?

(a) Increasing the sludge volume

(b) Reducing the sludge volume

(c) Constant sludge volume

(d) The second step of concentration of sludge

The question was posed to me during an interview.

My question comes from By-Products topic in section Effluent Treatment of Bioprocess Engineering

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Correct option is (b) Reducing the sludge volume

For explanation: Thickening is the first step for reducing the sludge volume by removal of free sludge water. Thin sludge is concentrated to thick sludge. Thick sludge has a higher viscosity, but must still be pumpable. Sludge settles in gravity thickeners and is compressed by the weight of its own solids.

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