Question: A completely mixed activated - sludge system has a hydraulic retention time of 8 . 3 h , an aeration tank DO concentration of 2

A completely mixed activated-sludge system has a hydraulic retention time of 8.3h, an
aeration tank DO concentration of 2mgL, and an MLSS concentration of 3000mgL.
Determine the following:
a) The aeration tank average SRT
b) The nitrification safety factor for a desired average effluent NH4-N concentration of
0.5mgL
A completely mixed activated - sludge system has

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