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What is sewage sludge?

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

(a) Separation of liquid and solid phase

(b) Product of wastewater treatment

(c) Type of wastewater treatment

(d) Suspended solids

The question was posed to me at a job interview.

This key question is from By-Products in chapter Effluent Treatment of Bioprocess Engineering

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Best answer
Correct choice is (b) Product of wastewater treatment

To explain: Sewage sludge is a product of wastewater treatment. Wastewater and stormwater enter the sewage system and flow into wastewater treatment facilities, where the solid wastes are separated from the liquid wastes through settling. At this point, they are processed and “digested”, or decomposed by bacteria.

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