Solid waste matter that settles down Scum in the first sedimentation tank is called.
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Answer:
sludge: any solid, semisolid, or liquid waste that settles to the bottom of sedimentation tanks (in wastewater treatment plants or drinking water treatment plants) or septic tanks.
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Answer: False
Explanation:Solid waste matter that settles down Sledge and scum floats on the top
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