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Thread: Activated Sludge Calculations

  1. #1
    Associate Engineer
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    Activated Sludge Calculations

    Hello...Can anyone here prove that the retention time in aeration tank of activated sludge system is equal to V/Q without considering the Qr? Thanks

  2. #2
    Lead Engineer Cake of Doom's Avatar
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    Has anybody told you differently or has a client questioned your methods?
    Last edited by Cake of Doom; 01-25-2016 at 07:24 AM. Reason: the beautiful south

  3. #3
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    Quote Originally Posted by Cake of Doom View Post
    Has anybody told you differently or has a client questioned your methods?
    it is all about how to prove this. Could it be proved at first place? Thanks

  4. #4
    Lead Engineer Cake of Doom's Avatar
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    V/Q is only a simplified form of HRT; assuming the effluent flow rate will be equal to the influent rate. For simple systems this is more than enough and, if need be, can be used to control the return rate so that the initial time still stands.

    Calculating what the return rate is needs a different calc.

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