TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Mechanism: The FEB reactor is used within an inflow half as an anaerobic/anoxic reactor, and at an outflow half as an anoxic aerobic reactor.Preferred Component: The inflow portion is a first FEB reactor, and the outflow portion is a second FEB reactor connected in series with and downstream from the first FEB reactor. The inflow half is equipped with floating down pumping mixers and diffused aeration system.    TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Condition: The anaerobic condition is dissolved oxygen (D.O.) of 0-0.15 mg/l and nitrate ions of less than 2 mg/l in recycled mixed liquor. The anoxic condition is a D.O. of 0.1-0.3 mg/l of mixed liquor. The aerobic condition is a D.O. of 1.0-3.0 mg/l of mixed liquor.Preferred Process: The outflow of denitrified mixed liquor from the second FEB reactor is the uniform 7-day/24-hour outflow. It is fed to the first FEB reactor as the recycled and denitrified mixed liquor of step (a). It is also fed partially to a downstream nitrification reactor. The nitrification reactor is operated under aerobic conditions in order to nitrify ammonia produced by de-amination of proteins in the wastewater inflow to produce nitrites and nitrates, and to use the substrate of organic compounds for multiplying while ingesting the phosphate ions on a luxury basis. The nitrite/nitrate-containing outflow from the nitrification reactor is divided into a nitrified recycle portion and a nitrified downstream portion. The nitrified recycle portion is 200-400% of the uniform 7-day/24-hour outflow. It is fed to the second FEB reactor as recycled mixed liquor. The nitrified downstream portion is fed to a clarifier to produce clarified liquor and activated sludge. The activated sludge is divided into a sludge recycle portion that is fed to the nitrification reactor and a sludge remainder portion. Ionic polymer and aluminum chloride are also mixed with the denitrified outflow. The anoxic reactor produces an outflow stream that is mixed with a chemical to complete the precipitation of phosphorus as sludge. The aeration system may be cycled on and off to provide cyclical oxygen transfer into the FEB reactor according to automatic timer controls (first control for D.O. levels). The first and second recycle streams may be varied in quantity as second, and third control methods, respectively. A third recycle stream may be selectively and variably removed from the second recycle stream and fed to the inflow half, as fourth control method. It also prevents the anaerobic/anoxic inflow half of the FEB reactor from becoming septic. The polyP bacteria discharge phosphate ions and use the energy released from it to take up volatile fatty acids derived by de-amination from the proteinaceous wastewater. Additional species of bacteria convert nitrate and nitrite ions to nitrogen gas while using oxygen ions as electron acceptor. There are 50-70% of the nitrate/nitrite ions that is recycled to the FEB reactor.Preferred Composition: The recycled and denitrified mixed liquor of step (a) is 50-200% of the equalized outflow. The nitrified downstream portion is 200-300% of the equalized outflow. The sludge recycle portion is 100-200% of the equalized outflow. EXAMPLE - FEB was used in wastewater produced in a poultry slaughtering operation operating 2-5 days a week on a single shift per day that handled 180000 birds per shift. An aluminum chloride dosage rate of 385 gallons per day was used to reduce total phosphorus concentrations from 15.2 ng/L to less than 1.0 mg/L, providing approximately 94% phosphorus removal efficiency. After start-up of 7-day reactors, the average final effluent total phosphorus concentration dropped to below 0.35 mg/L, providing approximately 98% phosphorus removal, while the required aluminum chloride dosage also dropped by 50% to approximately 190 gpd.