Aeration system using pure oxygen can be applied towards activated sludge process in wastewater treatment plant. Basically there are different types of oxygen generators designed for today’s application and one of the two most commonly in use today is the Pressure Swing Absorption (PSA) System, which is meant to serve smaller capacity plant size that does not go beyond 30 Mgal/day. The other one is the Cryogenic Generation System.
The pressure swing absorption system relies on multi-bed setup that usually comprises a four-bed system to generate endless flow of high purity oxygen. The principle on the whole operation works by means of using absorber to separate out the oxygen from normal air at high pressure. Since it needs absorbent to continue to function, the absorbent has to be regenerated back again by using a blowdown system working under low pressure. The whole process eventually will alternate between those two steps, whereby once adsorption takes place, it must be followed later on by regeneration.

Other alternative aeration facilities: Wastewater Blowers