Question

Water is aerated at which stage in a wastewater treatment plant?

• A. Primary treatment
• B. Secondary treatment
• C. Wastewater reduction
• D. Biochemical reduction

Answer 1

The correct option is B Secondary treatment

In secondary treatment in a wastewater treatment plant we remove the remaining solids through bacterial decomposition. The clarified water is aerated. Air enables the aerobic bacteria to break tiny bits of sludge present the wastewater.
After sometime the solid material settles at the bottom of the tank, which is then removed from the bottom of the tank.