- (a) Identify the figure and state its importance.
- (b) Why is air diffused into the aerator tank? Explain.
- (c) (i) What changes take place in the settling tank ?
OR
(c) (ii) How is BOD related to organic matter present in the water ?
Question:
Study the figure given below and answer the questions that follow. [Figure is implied: Secondary Sewage Treatment Plant showing Aeration Tank, Settling Tank, Activated Sludge, etc.]