What is the minimum requirement for the aeration tank size in a series of tanks for flow equalization?

The correct requirement for the aeration tank size in a series of tanks for flow equalization is three tanks. This is because a minimum of three tanks provides adequate volume and flexibility for both aeration and flow equalization in a septic system.

Having three tanks allows for proper distribution of flow, ensuring that the system can accommodate fluctuating wastewater inflow typical in residential settings. In addition to maintaining an effective biological treatment process, this configuration helps in maintaining consistent aerobic conditions, promoting the growth of beneficial microorganisms necessary for treating wastewater.

Furthermore, three tanks facilitate improved management of the biological processes within the aeration stages, allowing for staggered treatment levels and better control of the overall system. With two tanks, there may not be sufficient capacity to handle peak flows and adequately equalize wastewater loads, while a single tank would lack the necessary redundancy and ease of maintenance during operation. Thus, the requirement for three tanks contributes to optimal operation and efficiency in septic systems.