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8. A wastewater has a dissolved oxygen concentration of 2.0 mg/L and a discharge rate of...

8. A wastewater has a dissolved oxygen concentration of 2.0 mg/L and a discharge rate of 1.1 m3/s. The river into which it is being discharged has DO equal to 8.3 mg/L, a flow rate of 1.4 m3/s and a temperature of 200C. Assuming complete and instantaneous mixing, estimate the initial dissolved oxygen deficit of the mixture of wastewater and river water just downstream from the discharge point. The saturated valued of DO at 200C is 9.1 mg/L.

Engineering   Civil-Engineering   
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Answer #1

Now, we get the dissolved oxygen concentration just at the downstream of mixing of the two flows:

And the saturation dissolved oxygen concentration at 20°C is given as :

Now, the deficit of Oxygen just at the downstream of the mixing is given as:

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