A river is having discharge of 22m/s receives wastewater discharge of 5 m/s. The initial DO...

 

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A river is having discharge of 22m/s receives wastewater discharge of 5 m/s. The initial DO of the river water is 6.3 mg/L, and DO content in the wastewater is 0.6 mg/L. The five day BOD in the river water is 3 mg/L, and the wastewater added to river has five day BOD of 130 mg/L. Consider saturation DO of 8.22 mg/L and deoxygenation and reoxygenation cefficient values of 0.1 and 0.3 per day, respectively. Find critical D0 deficit and DO in the river after one day. The average velocity of flow in the stream after mixing of wastewater is 0.18 m/sec. (10 marks) A river is having discharge of 22m/s receives wastewater discharge of 5 m/s. The initial DO of the river water is 6.3 mg/L, and DO content in the wastewater is 0.6 mg/L. The five day BOD in the river water is 3 mg/L, and the wastewater added to river has five day BOD of 130 mg/L. Consider saturation DO of 8.22 mg/L and deoxygenation and reoxygenation cefficient values of 0.1 and 0.3 per day, respectively. Find critical D0 deficit and DO in the river after one day. The average velocity of flow in the stream after mixing of wastewater is 0.18 m/sec. (10 marks)