A schematic flow diagram of a completely mixed biological reactor with provision for recycling of solids

Q. 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, Xe, 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             

Ans: 7.5

Sol:

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