Detention Time Calculator

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Detention Time Calculator:

Enter the values of Volume of the tank, V(m3), and Flow rate, Q(m3/hr), to determine the value of Detention Time, DT(hr).

Enter Volume of the Tank: m3
Enter Flow Rate: m3/hr
   
Result -Detention Time: hr

Detention Time:

Detention Time (DT) is the amount of time a fluid remains in a treatment tank or basin before flowing out. It is a key design factor in water and wastewater treatment systems. It allows processes like sedimentation, aeration, or chemical reactions to take place efficiently.

Longer detention time gives better chances for impurities to settle or be treated. It is vital in clarifiers, grit chambers, aeration tanks, and settling tanks. If the detention time is insufficient, the treatment process may not be fully effective. If too long, it can lead to inefficiencies and require larger infrastructure.

Detention time also affects energy usage, treatment costs, and regulatory compliance. Detention time is determined by the tank’s volume and the rate at which fluid enters the system. The greater the volume or the slower the flow, the longer the detention time.

The units of volume are typically in cubic meters (m³) and flow rate in cubic meters per hour (m3/hr). Detention time is usually expressed in hours or minutes.

Accurate calculation helps ensure the system meets performance standards. Regular monitoring of DT helps in optimizing treatment effectiveness and avoiding overflows or underflows. It is also used in operational troubleshooting when treatment performance drops.

Detention Time, DT(hr) in hours equals Volume of the tank, V(m3) in cubic metres divided by Flow rate, Q(m3/hr) in cubic metres per hour.

Detention Time, DT(hr)= V(m3)/ Q(m3/hr)

DT(hr)= detention time in hour, hr.

V(m3)= volume of the tank in cubic metres. m3.

Q(m3/hr)= flow rate in cubic metres per hour, m3/hr.

Detention Time Calculation:

  1. A tank has a volume of 800 m3, and the flow rate is 200 m3/hr. Find the detention time.

Given: V(m3)= 800 m3,Q(m3/hr)= 200 m3/hr.

Detention Time, DT(hr)= V(m3)/ Q(m3/hr)

DT(hr)= 800 / 200

DT(hr)= 4hrs.

  1. A treatment tank has a volume of 1,200 m3 and a detention time of 6 hours. Find the flow rate.

Given: V(m3)= 1200 m3,DT(hr)= 6hrs.

Detention Time, DT(hr)= V(m3)/ Q(m3/hr)

Q(m3/hr)= V(m3)/ DT(hr)

Q(m3/hr)= 1200 / 6

Q(m3/hr)= 200m3/hr.

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