Screening
Skimming
Filtration
None of these
Answer is Right!
Answer is Wrong!
The correct answer is B. Skimming.
Skimming is a process used to remove oil and grease from sewage. It is a physical process that uses gravity to separate the oil and grease from the water. The oil and grease float to the surface of the water and are then skimmed off.
Screening is a process used to remove large objects from sewage. It is a physical process that uses screens to filter out the large objects. The screens are usually made of metal or plastic.
Filtration is a process used to remove small particles from sewage. It is a physical process that uses filters to remove the small particles. The filters are usually made of sand or gravel.
None of these is a correct answer.