Description...
The A/0 process improves upon the activated-sludge process by using an anaerobic selector to develop a biomass. This biomass first stores BOD anaerobically and then assimilates phosphorus in a subsequent oxic, or aerobic zone. Because its operation uses anaerobic uptake of BOD, the process particularly resists hydraulic and organic upsets. It also minimizes the presence of Nocardia and other sludge-bulking organisms commonly found in activated sludge plants. The A/0 process for secondary treatment has been proven reliable and cost-effective through extensive pilot testing and actual full-scale plant operation