engineering recuitment BHEL Engineer Trainee Mock Test 2025 Environmental Engineering Quality and Characteristics of Sewage
The following data pertains to a sewage sample at a point source.
Initial dissolved oxygen (DO) = 12 mg/I; Final DO = 4 mg/I; Dilution of sewage was done to 2% .
The Bio-chemical oxygen demand (BOD) of the given sample of sewage is:
1
800 mg/l
2
80 mg/l
3
8 mg/l
4
400 mg/l