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Both extended aeration and aeration are methods used in the treatment of wastewater. However, there are some key differences between the two processes.

Aeration is a process in which air is added to wastewater to encourage the growth of aerobic bacteria. These bacteria consume organic matter in the wastewater and convert it into carbon dioxide and water. Aeration can be accomplished using several different methods, including diffused aeration, surface aeration, and mechanical aeration.

Extended aeration, on the other hand, is a variation of the aeration process that involves the use of a specialized aeration tank. In extended aeration, wastewater is allowed to remain in the aeration tank for an extended period of time, typically 20 to 30 hours. During this time, the aerobic bacteria are given more time to consume organic matter in the wastewater. The extended time in the aeration tank allows for a more complete breakdown of organic matter, resulting in a higher quality effluent.

One of the main benefits of extended aeration is that it can be used to treat wastewater with a lower organic loading rate. This means that it can be a more cost-effective option for smaller communities or businesses that generate less wastewater.

In summary, while both aeration and extended aeration are methods used in the treatment of wastewater, extended aeration is a variation of aeration that involves allowing the wastewater to remain in the aeration tank for an extended period of time to allow for a more complete breakdown of organic matter.