Activated sludge contains

A. 3 - 6% N, 2% P₂O₅ and 2.5% K₂O

B. 3 - 6% N, 2% P₂O₅ and 1.0% K₂O

C. 8 - 10% N, 2% P₂O₅ and 1.5% K₂O

D. 4 - 6% N, 2% P₂O₅ and 2.5% K₂O

Answer: Option B

Solution(By Examveda Team)

Activated sludge contains 3 - 6% N, 2% P₂O₅ and 1.0% K₂O.
The activated sludge process is a type of biological wastewater treatment process for treating sewage or industrial wastewater using aeration and a biological floc composed of bacteria and protozoa.
It uses air (or oxygen) and microorganisms to biologically oxidize organic pollutants, producing a waste sludge (or floc) containing the oxidized material.