Patent ID: 8052874
Filing Date: 2011-11-08
Classification: C02F,Y02W

Abstract:
1. In a sewage treatment system and process, a method for increasing efficiency in an MBR zone with membrane separators in which water is removed from mixed liquor, wherein superoxygenation and air scour are employed, comprising: supersaturating influent wastewater or mixed liquor with oxygen prior to biological treatment, so that the wastewater or mixed liquor is oxygenated beyond normal saturation content of water, to an oxygen content of at least 50 parts per million, introducing the oxygen-supersaturated wastewater or mixed liquor into a biological process zone requiring oxygen, thereby causing part of the oxygen in the mixed liquor to be taken up to support the biological process, and directing the mixed liquor to membrane separators to remove water, and causing essentially a remaining portion of supersaturated oxygen in the mixed liquor to evolve from solution as relatively large bubbles which form and rise from beneath the membrane separators with sufficient velocity to cause air scour of the membrane separators in the MBR zone, whereby membrane air scouring requirements are reduced by the evolving oxygen bubbles, while the dissolved oxygen can meet most of process oxygen demand.