Question: The BODL in a stream is 3mg/L, and the DO is 9.0mg/L. Streamflow is 15mgd. A treated sewage effluent with BODL=50mg/L is discharge into the

The BODL in a stream is 3mg/L, and the DO is

The BODL in a stream is 3mg/L, and the DO is 9.0mg/L. Streamflow is 15mgd. A treated sewage effluent with BODL=50mg/L is discharge into the stream. The saturation DO level is 11mg/L. Calculate the diluted BODL, diluted DO, and the minimum DO level in the stream. [Answer: BODL=14.8mg/L,DO=7.3mg/L, and minimum DO level =3.7mg/L. Hints: use the dilution equation to calculate the values of DO and BODL, use this DO value to calculate the minimum DO level] [ 4+4+2=10 Marks]

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