Question

In a STP (Sewage Treatment Plant), arrange the following in sequence of involvement:

(1) Anaerobic sludge digester (2) Large aeration tank

(3) Primary settling tank (4) Large settling tank

• A. C → B → D → A
• B. B → A → D → C
• C. B → D → A → C
• D. C → B → A → D

Answer 1

Answer: (A)

C → B → D → A