What is sludge?Explain how it is treated.
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sludge is a waste product product removed from water it is treated in 3 ways primary secondary and tertiary
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Semi - solid such as feaces that settle down during waste water treatment are called sludge. This sludge is removed using a scraper and then transferred to a tank where it is decomposed by anaerobic bacteria to produce biogas. This biogas is as a low cost fuel for heating, cooking etc.
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