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Equalization
Equalization

In wastewater treatment, equalization is the process of homogenizing the wastewater to be treated by aeration and/or mixing. As fluctuations occur in the daily incoming flow rate and quality of such streams, this process is required to be able to control both parameters when sending the wastewater to the next process steps.

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The typical retention time in an equalization tank is 6 to 8 hours, given that the internal accessories are also properly designed.

No, the two are different processes but are often mistakenly interchanged. Neutralization is the process of balancing any acidity or alkalinity in water with the use of chemical addition, while equalization is the process of maintaining water quality and flow... (More)

The main function of an equalization tank is to homogenize flow variations in the wastewater stream. In most cases, this is the first step of wastewater treatment alongside neutralization before pumping to the next unit operation.

To support the equalization tank's main function of homogenization, the collected wastewater needs to be mixed. This is usually done by aeration. At the same time, aeration is done to avoid chances of the wastewater becoming septic.