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The BOD5 of an effluent from a municipal sewage treatment plant is 25mg/L, and the effluent discharge is 4ML/d. The receiving stream has a BOD5

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The BOD5 of an effluent from a municipal sewage treatment plant is 25mg/L, and the effluent discharge is 4ML/d. The receiving stream has a BOD5 of 2mg/L, and the stream flow is 40ML/d. Calculate the combined 5-day BOD in the stream just below the mixing zone. [Answer: 4.1mg/L.] [5 Marks]

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