Pure oxygen is used in the aeration system for wastewater treatment, which biologically treats wastewater using microbes of activated sludge in an aeration tank. The typical aeration tank process includes an air supply device for supplying air into the aeration tank, so that microbes in the activated sludge can respire. The conventional air supply device in the aeration tank has disadvantageous effects in that the supplied oxygen is insufficient for the respiration and growth of microbes of activated sludge because the atmospheric air supplied to the aeration tank contains only 21% oxygen.
By increasing the oxygen levels in the air supply the biological activity required to eliminate wastes in water is increased dramatically. A pure oxygen aeration system for wastewater treatment, which is capable of supplying gas containing 90% or higher oxygen to an aeration tank is an economical and efficient way to treat wastewater.