* After removing sludge and floatable oil and
grease from the waste water, water left in
the Sedimentation tank is called
Water.
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Explanation:
Sedimentation tank: Water is then allowed to enter in a tank where solids like faeces (called sludge) settle at the bottom and are removed with a scraper. A skimmer removes the floatable materials like oil and grease. Water so cleared is called clarified water.
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