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1. |
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 DO. 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. |
Answer» D. 400 mg/l. | |