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30 December, 10:50

A more experienced colleague mentions to you that you should aim for a dissolved oxygen concentration around 1.0 mg/L at day 5 of the experiment. They show you data from a similar wastewater spill that happened last year, in which the BOD5 of the stream water was 60 mg/L. From your previous experiment, you found that the dissolved oxygen concentration at day 0 was 10 mg/L. Based on this information, what dilution factor, P, should you try in your reactor?

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  1. 30 December, 11:16
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    Explanation:

    Lt = Loe^ (-kt)

    dа ta:

    Lo = 10 mg/mL

    Assume k = 0.23/da

    1. Calculate L5

    L5 = 10e^ (-5*0.23) = 10e^-1.15 = 10 * 0.317 = 3.17 mg/mL

    2. Calculate the dilution factor

    You expect to find L5 to be about 3

    You want L5 to be about 1.

    You should use a dilute your sample by a factor of 3.

    P = 3
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