The BOD5 of an effluent from a coke oven plant is 25 mg/L, and the effluent discharge is 4 ML/d. The receiving stream has a BOD5 of 2 mg/L and the stream flow is 40 ML/d. What will be the BOD5 in the stream just below the mixing zone?
A. 4.5
B. 5.2
C. 4.1
D. 4.8
Answer: Option C
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