ABSTRACT
Diffused aeration is defined as the injection of air or oxygen enriched air under pressure below a liquid surface. All of the equipment discussed in this chapter meets this definition. However, certain hybrid equipment that combines gas injection with mechanical pumping or mixing is also covered under this topic. These hybrid devices include jet aerators and U-tube devices. Other devices, such as sparged turbine aerators and aspirating impeller pumps, are covered under mechanical aeration systems.
