5. What is sludge? Explain how it is treated.
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In sewage treatment plants, the residue that accumulates is called sludge. It is treated by anaerobic bacteria. Complete answer: ... Using a skimmer, sludge is collected and then transported to a tank where it is decomposed for biogas processing by anaerobic bacteria.
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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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