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What is sludge? Explain how it is treated.

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Semi – solids such as faeces that settle down during wastewater treatment are called sludge. This sludge is removed using a skimmer and then transferred to a tank where it is decomposed by anaerobic bacreria to produce biogas. 

The biogas is used as a low – cost fuel for heating, cooking etc., It is also used to produce electricity.

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