Enter the volume of the aeration tank (m^3) and the influent flow rate (m^3/s) into the Calculator. The calculator will evaluate the Hydraulic Retention Time. 

Hydraulic Retention Time Formula

HRT = V/Q

Variables:

  • HRT is the Hydraulic Retention Time (sec)
  • V is the volume of the aeration tank (m^3)
  • Q is the influent flow rate (m^3/s)

To calculate Hydraulic Retention Time, divide the volume of the aeration tank by the influent flor rate.

How to Calculate Hydraulic Retention Time?

The following steps outline how to calculate the Hydraulic Retention Time.

  1. First, determine the volume of the aeration tank (m^3). 
  2. Next, determine the influent flow rate (m^3/s). 
  3. Next, gather the formula from above = HRT = V/Q.
  4. Finally, calculate the Hydraulic Retention Time.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

volume of the aeration tank (m^3) = 800

influent flow rate (m^3/s) = 20