Hydraulic retention time
Encyclopedia
The Hydraulic retention time (HRT) also known as Hydraulic residence time or t (tau), is a measure of the average length of time that a soluble compound remains in a constructed bioreactor.

Hydraulic retention time is the volume of the aeration tank divided by the influent flowrate:



where using SI Units Volume is in [m3] and Influent flowrate is in [m3/h].
HRT is usually expressed in hours (or sometimes days).
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