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Homework Help: Calc. the effluent inert particulate conc. from a CSTR w/w/o solid liquids separation

  1. May 9, 2010 #1
    Hi, I have no idea how to do this complicated problem. Help would be greatly appreciated. Thanks.

    1a)Calculate the effluent inert particulate concentration (Xi, mg COD/L) from a CSTR (volume
    V = 1000 L ), operating without solids liquids separation, fed with inert particulate matter (Xi,o = 10 mg COD/L). The influent flow to the reactor, Q, 1000 L/d.

    1b): Re-calculate XI if the same reactor is now operated with solids-liquids separation such that the solids retention time, θx is 10 d; all other parameters stay the same.

    So I have:
    initial Xi,o = influent inert particulate matter = 10 mg COD/L
    V = 1000 L
    Q = influent flow to the reactor = 1000 L/d
    effluent XI = effluent inert particulate matter = ?

    I know that
    rate of mass accumulation in control volume = rate(s) of mass in - rate(s) of mass out + rate(s) of mass generation.

    So, something like V = QinXin - QoutXout + ????

    I'm sure this has something to do with part a and b, but I have no idea how to go about it.
  2. jcsd
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