After mixing with a waste discharge, the initial ultimate BOD of a river is 12 mg/L. The DO in the river after the waste

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After Mixing With A Waste Discharge The Initial Ultimate Bod Of A River Is 12 Mg L The Do In The River After The Waste 1 (35.92 KiB) Viewed 11 times

After mixing with a waste discharge, the initial ultimate BOD of a river is 12 mg/L. The DO in the river after the wastewater and river have mixed is at saturation. The river temperature is 10°C. At 10°C, the deoxygenation rate constant is 0.3 day-¹, and the reaeration rate constant is 0.4 day-1. Assuming DOsat is 11.33 mg/L @ 10°C and 10.15 mg/L @ 15°C, a. Determine the critical point at days and the critical DO mg/L. b. Assuming the river temperature rises to 15°C in summer so that both rate constants change, determine the critical point at days and the critical DO mg/L.