railway RRB JE (CBT I + CBT II) Mock Test 2024 Environmental Engineering Disposing of Sewage Effluents
A wastewater sample of 2 ml is made up to 300 ml in a BOD bottle with distilled water. The initial D.O. of the sample is 8 mg/l and after 5 days it is 2mg/l. Its BOD is:
1
6 mg/l
2
894 mg/l
3
2400 mg/l
4
900 mg/l