what is sludge ? how is it made?
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Answer:
thick, soft, wet mud or a similar viscous mixture of liquid and solid components
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Explanation:
Sewage sludge is the residual, semi-solid material that is produced as a by-product during sewage treatment of industrial or municipal wastewater. The term "septage" also refers to sludge from simple wastewater treatment but is connected to simple on-site sanitation systems, such as septic tanks.
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