1.

Calculate the residence time for the following data.Influent nitrate: 22 mg/LEffluent nitrate: 3 mg/LOverall denitrification rate: 0.038 per day.MLVSS: 2000 mg/L

A. 1.5 hrs
B. 5 hrs
C. 6 hrs
D. 9 hrs
Answer» D. 9 hrs


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