Chapter 10: Wastewater Story

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Wastewater Story


What is sludge? Explain how it is treated.


Sludge is defined as solid waste (like human faeces) that settle at the bottom of the sedimentation tank and are removed by scrapers. Sludge is transferred to a separate tank where it is decomposed by anaerobic bacteria to produce biogas. Biogas is used to fuel or can be used to produce electricity.

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