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1. |
A drain carrying 5 m3/s of wastewater with its BOD of 100 mg/l joins a steam carrying 50 m3/s flow with its BOD of 5 mg/l. What will be the value of the BOD of the combined flow after complete mixing? |
A. | 3.6 mg/l |
B. | 13.6 mg/l |
C. | 33.6 mg/l |
D. | 53.6 mg/l |
Answer» C. 33.6 mg/l | |