Question

a. A layer formed on the surface of wastewater during sedimentation by floating greasy
material is called​

Answer 1

Answer:

The wastewater is held in a large sedimentation tank for several hours. This allows heavier solids to settle to the bottom and form a sludge layer. Lighter solids, fats, oil, and grease float to the top, creating a scum layer.

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Answer 2

Answer:

The wastewater is held in a large sedimentation tank for several hours. This allows heavier solids to settle to the bottom and form a sludge layer. Lighter solids, fats, oil, and grease float to the top, creating a scum layer.