Oxygen’s chemical property is very lively. Under certain conditions it can be converted into highly oxidizing ozone. Ozone is the ideal means of sewage treatment which can effectively oxidize and degrade organic matter and some inorganic matter in sewage, and has no secondary pollution.

Oxygen is also the necessary gas to keep the microorganisms alive. Biological aeration, the oxygen can significantly enhance the sludge activity, efficient decomposition of organic matter. Therefore, oxygen can be used as ozone and biological aeration gas source.