Question

what is sludge

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Answer 1

Explanation:

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Sludge is human waste (like faeces) in waste water left during sewage treatment. Since it is organic waste, it is used to produce biogas and manure. Sludge is collected by a scrapper. It is transferred to a separate tank where it is decomposed by the anaerobic bacteria.

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Answer 2

Answer:

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Sludge is a semi-solid slurry that can be produced from a range of industrial processes, from water treatment, wastewater treatment or on-site sanitation systems.