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


Solution

In wastewater treatment plant, the wastewater is passed through screens and then is allowed to settle down in a large tank. Semi-solids such as faeces that settle down during wastewater treatment are called sludge.

This sludge is removed using a skimmer and then is transferred to a tank where it is decomposed by anaerobic bacteria to produce biogas. This biogas is used as a low-cost fuel for heating, cooking, etc. It is also used to produce electricity.

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