Hydraulic retention time | Hydraulic residence time | HRT | @ETPKnowledgeJunction

The hydraulic retention time (HRT) in wastewater treatment plant is a measure at an average length of time holding the wastewater in a tank. It is also known as hydraulic residence time.

The wastewater treatment plant is mainly designed to handle the wastewater at normal load & also during shock loads. The wastewater is retained in different treatment units at a particular time to achieve the desired parameters. The HRT followed in the Homogenization Tank is 12 to 24 hours, 24 to 48 hours in aeration tanks, 72 to 120 days in Anaerobic Reactors, 5 to 12 hours in Secondary Clarifiers, 3 to 5 hours in Primary clarifiers. During the design stage itself the HRT of wastewater in various stages are calculated in order to achieve the outlet parameters. If HRT is not properly maintained at various stages, we may not get the desired parameters for discharge.

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