Civil Engineering > GATE 2018 SET-2 > Environmental Engineering
A schematic flow diagram of a completely mixed biological reactor with provision for recycling of solids is shown in the figure.
S0, S = readily biodegradable soluble BOD, mg/L
Q, Qr, Qw = flow rates, m3/d
X0, X, Xv, Xu = microorganism concentrations (mixed-liquor volatile suspended solids or MLVSS), mg/L.
The mean cell residence time (in days, up to one decimal place) is _______.
Q, Qr, Qw = flow rates, m3/d
X0, X, Xv, Xu = microorganism concentrations (mixed-liquor volatile suspended solids or MLVSS), mg/L.
The mean cell residence time (in days, up to one decimal place) is _______.
Correct : 7.5 to 7.5
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