What is sludge? Explain how it is treated.
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Semi-solids such as faeces that settle down during wastewater treatment are calledsludge. This sludge is removed using a scraper and then transferred to a tank where it is decomposed by anaerobic bacteria to produce biogas.
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Sludge is the semi-solid slurry that is obtained during water treatment.
- Sludge is extracted during the treatment of waste water by the process of filtration.
- During primary treatment, the solid waste that settles down form the primary sludge. The remaining effluent is later taken for secondary treatment.
- Here, most biological waste is removed by bacterial flocs. These flocs are later removed by sedimentation and the clean water is released into water bodies.
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