The initial ultimate BOD after mixing of the Bergelmir River is 12.0 mg ∙ L ^–1 . The DO in the Bergelmir River after the wastewater and river have mixed is at saturation. The river temperature is 10°C. At 10°C, the deoxygenation rate constant (k _d ) is 0.30 day-1, and the reaeration rate constant (k _r ) is 0.40 day-1. Determine the critical point (t _c ) and the critical DO.

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Critical point and critical DO Given data L a 12 mg ... View the full answer