Oxygen is mixed with waste water at an early stage in a water treatment facility, to reduce odor caused by anaerobic reactions of sulfur. Waste water is withdrawn from a collection basin, by a pump connected to a suction pipe, and is mixed with oxygen from an external source. The mixture, having been...http://www.google.com/patents/US6413418?utm_source=gb-gplus-sharePatent US6413418 - System and method for oxygenation of waste water
