Q. In the sewage treatment bacterial flocs are allowed to sediment in a settling-tank. This sediment is called as
A) Activated sludge
B) Primary sludge
C) Anaerobic sludge
D) Secondary sludge
Explanation
In the sewage treatment when Biochemical Oxygen Demand (BOD) of sewage has reduced, the effluent is passed into settling tank. Here, the bacterial flocs settle and the sediment is called activated sludge
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.