Civil Engineering Mcqs

3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is______________________?

(A)  100 mg/l

(B)  200 mg/l

(C)  300 mg/l

(D)  400 mg/l

Submitted By :Ali Uppal

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