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  2. What is sludge? Explain how it is treated.
# NCERT

5. What is sludge? Explain how it is treated.

Answers (1)
S Sayak

Sludge is the solid waste which has settled at the bottom of settling tanks during the process of wastewater treatment.

It is treated by decomposition by anaerobic bacteria. This activated sludge further can be used as manure.

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