Solids like fats, grease and oil that float on top of liquid wastewater is called ______.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. sludge
- Solids like fats, grease and oil that float on top of liquid wastewater is called sludge.
- These materials are removed by the process of skimming and make water fit for use.
- A skimming tank is a chamber so arranged that the floating matter like oil, fat, grease etc, rise and remain on the surface of the wastewater (sludge) until removed, while the liquid flows out continuously under partitions or baffles.