An aeration system is among the most energy-intensive operations in wastewater treatment systems and is responsible for between 50-90% of total energy consumption in typical municipal installations. The optimum bubble size for aeration with compressed air and no mechanical mixing typically is considered to be 1 to 2 mm in diameter. This range of bubble diameter provides a compromise between the conditions for good mass transfer and efficient mixing. Gas transfer technologies that are able to produce bubbles in the range of 10 to 1000 m require a high power input, such as fine bubble aeration, jet aeration, etc. For standard submerged aerators, the bubble formation on the surface of aerator undergoes three stages: expansion stage, detachment stage, and coalescence due to bubble-bubble combination, which results in larger bubbles.