In the sewage treatment, bacterial floes are allowed to sediment in a settling tank. This sediment is called as
A. inactivated sludge
B. activated sludge
C. primary sludge
D. secondary sluge
Answer:B
In the sewage treatment, bacterial floes are allowed to sediment in a settling tank. This sediment is called as
A. inactivated sludge B. activated sludge C. primary sludge D. secondary sluge