Question

Which of the following is a primary treatment for water pollution?

• A. Sludge method
• B. Trickling filter method
• C. Sedimentation
• D. Removal of nitrates

Answer 1

Answer:

C. Sedimentation

• The primary treatment involves the separation of solid matter from the wastewater.

• In this, the wastewater is poured into big tanks and the solid matter is allowed to settle at the surface of the tanks.

• This is done by sedimentation, filtration, flotation, etc.