A waste water sample diluted to 100 times with aeration water had an initial D.O of 7.0 mg/l and after 5 days of incubation at 20°C, the D.O was zero. The BOD of waste water is -
1
700 mg/l
2
100 mg/l
3
Cannot be determined
4
7 mg/l
A waste water sample diluted to 100 times with aeration water had an initial D.O of 7.0 mg/l and after 5 days of incubation at 20°C, the D.O was zero. The BOD of waste water is -