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3 October, 08:15

An effluent discharge with a flow of 1.5 m3/s and an ammonium-N concentration of 2 mg/L is released to a river with a flow of 12 m3/s and an ammonium-N concentration of 0.015 mg/L. What is the concentration of this mixture after they have become perfectly mixed downstream?

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  1. 3 October, 11:20
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    the final concentration is C=0.235 mg/L

    Explanation:

    doing a mass balance

    ammonium mass outflow = ammonium inflow from river + effluent discharge of ammonium = 12000 L/s * 0.015 mg/L + 1500 L / s * 2 mg/L = 3180 mg/s

    outflow rate = 12000 L/s + 1500 L / s = 13500 L/s

    then the final concentration is

    C = ammonium mass outflow/outflow rate = 3180 mg/s/13500 L/s = 0.235 mg/L
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