Aeration Tank - Dimension


    1. Select qc and kinetic coefficient and control MLSS in aeration tank

    qc = 5 d (Only for carboneous BOD5 removal)

    qc ¾ activated sludge retention time in system 

    Y = 0.6 mg VSS/mg BOD5 

    Kd = 0.06 1/d 

    Kd ¾ decay coefficient of organisms (1/d) based on first order reaction

    MLSS = 2,500 mg/l

    2. Dimension of aeration tank

    QAd ¾ average daily flowrate, gal/day

    y ¾ mass loading coefficient > 1.0

    y QAd (gal/day) qc(day)
    Y (mg VSS/mg BOD5) S0 (mg/l) S (mg/l)
    MLSS (mg/l) MLVSS/MLSS Kd (1/d)
    (ft3) 

    Number of tanks = 4 

    Depth of water = 15.5 ft

    L : W = 2 : 1 (complete-mix)

    L = 62 ft

    W = 31 ft

    Select L, W, d from here, then

Depth (ft) Length(ft)
Width (ft) # of Tanks
(ft3) 

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