What is the solid waste material removed during sewage treatment called?

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Multiple Choice

What is the solid waste material removed during sewage treatment called?

Explanation:
In sewage treatment, the solid waste that is removed and processed further is called sludge. This mass comes from the solids that settle out or are thickened during treatment and includes organic matter and microorganisms washed out of the wastewater. The liquid that remains after removing these solids is called effluent, which is discharged or treated further, not sludge. A slurry is simply a thick mixture of solids in liquid and can describe sludge in motion, but the standard term for the solid waste portion is sludge. Residue is too vague for this specific waste stream. So sludge is the correct term.

In sewage treatment, the solid waste that is removed and processed further is called sludge. This mass comes from the solids that settle out or are thickened during treatment and includes organic matter and microorganisms washed out of the wastewater. The liquid that remains after removing these solids is called effluent, which is discharged or treated further, not sludge. A slurry is simply a thick mixture of solids in liquid and can describe sludge in motion, but the standard term for the solid waste portion is sludge. Residue is too vague for this specific waste stream. So sludge is the correct term.

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